WEST BENGAL STATE ELECTRICITY TRANSMISSION COMPANY LIMITED

(A Government of West Bengal Enterprise)

CIN: U40101WB2007SGC113474; Website: www.wbsetcl.in
Registered Office: Vidyut Bhawan, Block-DJ, Sector-II, Bidhananagar, Kolkata -700091
Office of the Chief Engineer (Procurement), Vidyut Bhawan (10th Floor), Block-‘B’.
Phone No.033-2359-1956: Fax No.033-2359-1894, E-mail: procurement.hq@wbsetcl.in

PACKAGE 40
NEW TOWN AAIIC

a. Replies to pre bid queries

b. 4 nos Civil drawings
c. 2 nos Electrical drawings
d. Limitation of Liability clause
e. Revised BOQ
 WEST BENGAL STATE ELECTRICITY TRANSMISSION COMPANY LIMITED
(A Government of West Bengal Enterprise)
CIN: U40101WB2007SGC113474; Website: www.wbsetcl.in
Registered Office: Vidyut Bhawan, Block-DJ, Sector-II, Bidhananagar, Kolkata -700091
Office of the Chief Engineer (Procurement), Vidyut Bhawan (10th Floor), Block-‘B’.
Phone No.033-2359-1956: Fax No.033-2359-1894, E-mail: procurement.hq@wbsetcl.in

Package 40

The GCC Clause 32.1 for Liability after Expiry of Defects Liability Period shall be now
read as:

Except in case of gross negligence or willful misconduct

a. Neither party shall be liable to the other party for any indirect or consequential loss
or damage, loss of use, loss of production or loss of profits or interest cost,
provided that this exclusion shall not apply to any obligation of the bidder to pay
liquidated damages to WBSETCL, and

b. The aggregate liability of the bidder to WBSETCL, whether under the order, in
tort, or otherwise, shall not exceed the amount specified in the contract Price.
Provided that this limitation shall not apply to the cost of repairing of replacing
defected equipments/solutions, or to any obligation of the bidder to indemnify
WBSETCL with respect to patent infringement.

Yours faithfully,
Sd/-
(P.S. De)
Chief Engineer (Procurement)
WBSETCL
WEST BENGAL STATE ELECTIRCITY TRANSMISSION
COMPANY LIMITED
(
 Volume III:
Technical Specification for SS Civil Part

WBSETCL Page - 2/88 Sub-station Civil Tech. Specs

 INDEX
SL. No. CIVIL,STRUCTURAL & ARCHITECTURAL ITEMS PAGE
NO.
10.01 GENERAL 6
10.01.01 STANDARD AND REFERENCES 6
10.01.02 LIST OF CODES AND STANDARDS 7
10.02 SCOPE OF WORK 9
10.03 WORK SCHEDULE 10
10.04 DESIGN AND DRAWINGS 10
10.04.01 DESIGN OF CIVIL WORKS 10
10.04.02 CONTRACT DRAWING 11
10.04.03 AS BUILT DRAWINGS 11
10.05 SURVEY AND SETTING OUT 11
10.05.01 LAND DEVELOPMENT WORK 12
10.06 GEO TECHNICAL INVESTIGATIONS AND PARAMETERS 13
10.07 SUBSTATION ROADS 14
10.07.01 BOX CUTTING 15
10.07.02 EDGING 15
10.07.03 SOLING 15
10.07.04 PRECAST CONCRETE PIPE CULVERTS 16
10.07.05 WATER BONUND MACADAM 16
10.07.06 DRY ROLLING 17
10.07.07 WET ROLLING (WATER BONUND MACADAM) 17
10.07.08 BITUMINOUS PREMIX CARPET AND SEAL COAT 18
10.07.09 R.C.C. CULVERT 19
10.08 EARTH WORK IN EXCAVATI0N, BACK FILLING & 19
CRUSHED STONE SPREADING / GRAVEL SPREADING
10.08.01 EARTH WORK IN EXCAVATION 19
10.08.02 BACK FILLING 20
10.08.03 CRUSHED STONE SPREADING FOR NEW SUB-STATION 21
10.09 SWITCHYARD FENCING AND GATES 21
10.09.01 MATERIALS 21
10.09.02 DESIGN 21
10.09.03 BOUNDARY WALL 22
10.09.03.01 PROTECTIONS 22
10.09.04 A) M. S. GATE 24
10.09.05 B) M. S. WICKET GATE 24
10.10 CONCRETE AND ALLIED WORKS 24
10.10.01 COMPOSITION OF CONCRETE 24
10.10.02 CEMENT 25
10.10.03 COARSE AGREEGATE 26
10.10.04 FINE AGREEGATE 26
10.10.05 ADMIXTURE 27
10.10.06 WATER 27
10.10.07 STEEL REINFORCEMENT 27
10.10.08 FORM WORK 27
10.10.09 BATCHING AND MIXING 28
10.10.10 PLACING OF CONCRETING 28
10.10.11 CONCRETE CONSTRUCTION TOLERANCE 29
10.10.12 CONSTRUCTION JOINTS 29
10.10.13 REPAIR OF CONCRETE 30
10.10.14 PROTECTION AND CURING OF CONCRETE 30
10.10.15 TESTS 30

WBSETCL Page - 3/88 Sub-station Civil Tech. Specs

 INDEX
10.10.16 READY MIX CONCRETE 31
10.10.17 ACCEPTANCE CRITERIA 31
10.11 SUBSTATIONS STEEL STRUCTURES 31
10.11.01 MATERIALS 32
10.11.02 DESIGN CONSIDERATIONS 33
10.11.03 COMBINATIONS OF LOADS 34
10.11.04 CONNECTIONS 34
10.11.05 QUALITY CONTROL 35
10.12 FABRICATION 35
10.12.01 WORKMANSHIP 36
10.12.02 CLEANING & GALVANIZING 37
10.12.03 SHOP ASSEMBLY 38
10.12.04 SHOP TEST 38
10.13 FOUNDATION WORKS 38
10.13.01 DESIGN OF FOUNDATIONS 39
10.13.02 DETAILS 43
10.13.03 BORED CAST IN SITU PILES 43
10.13.03.01 EQUIPMENT AND ACCESSORIES 44
10.13.03.02 DIAMETER OF PILES 44
10.13.03.03 CONTROL OF ALIGNMENT 45
10.13.03.04 MATERIALS OF PILLING 45
10.13.03.05 DRILLING MUD (BENTONITE) 46
10.13.03.06 BORING OPERATIONS 46
10.13.03.07 CONCRETING 47
10.13.03.08 TETSTING OF PILES 48
10.13.03.09 GENERAL 49
10.14 CONTROL BUILDING 49
10.14A INTEGRATED BUILDING 51
10.14B GIS BUILDING (PRE ENGINEERED SINGLE STORIED) 53
10.14C CONTROL BUILDING WITH PRE ENGINEERED STEEL
STRUCTURE FRAME WORK
10.14.01 DOORS, WINDOWS AND COLLAPSIBLE GATE 56
10.14.02 ROLLING STEEL SHUTTERS/GRILLS 60
10.14.03 MASONARY AND ALLIED WORKS 60
10.14.04 PLASTERING 61
10.14.05 FINISH 62
10.14.06 FLOOR FINISH 62
10.14.07 CARPENTRY AND JOINERY 66
10.14.08 PAINTING, WHITE WASHING, DISTEMPERING ETC. 66
10.14.09 ROOF WATER PROOFING, INSULATION AND ALLIED WORKS 68
FOR INTEGRATED BUILDING
10.14.10 SUSPENDED CEILING WITH SNAP GRID SYSTEM 68
10.15 WATER SUPPLY, PLUMBING AND SANITARY FIXTURES 69
AND SEWAGE DISPOSAL SYSTEM
10.15.01 WATER SUPPLY 71
10.15.02 DRAINAGE AND SANITATION 72
10.16 CABLE TRENCHES, RACKS ETC. 75
10.17 STORM WATER DRAINAGE SYSTEM 75
10.18 RAIL-CUM-ROAD 76
10.19 OIL SOAK PITS 76

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 INDEX
10.20 OIL/WATER SUMP 77
10.21 DRAINAGE SUMP, SUMP PUMP & PUMP HOUSE /DEEP TUBE 77
WELL PUMP HOUSE.
10.22 FIRE FIGHTING RESERVOIR / PUMP HOUSE. 78
10.23 COMPOUND WALL ENCLOSING COLONY AREA 78
10.24 RESIDENTIAL BUILDINGS 78
10.24.01 RESIDENTIAL BUILDINGS 79
10.24.02 SECURITY BARRACK, STORE SHED & STORE SHED WITH 79
OFFICE
10.25 ANTI-TERMITE TREATMENT 80

10.26 FANS, LIGHTS AND A.C. MACHINE 80

10.27 WEIGHT OF SUB-STATIONS STRUCTURES 80
10.28 ADDITIONAL WORK 80
BRIEF SCHEDULE OF ARCHITECTURAL FINISHES FOR 83
CONTROL ROOM BUILDING

BRIEF SCHEDULE OF ARCHITECTURAL FINISHES FOR C- 85

TYPE QTRS, DORMITORY

BRIEF SCHEDULE OF ARCHITECTURAL FINISHES FOR 87

STORE SHED CUM OFFICE

WBSETCL Page - 5/88 Sub-station Civil Tech. Specs

10.01 GENERAL:

This specification covers the general requirements for soil exploration, site grading,
design, fabrication, supply and construction of civil, structural steel and architectural
works for substation and staff quarters including setting out and survey work.

The Contractor shall perform the works to meet the requirements of this specification, the
attached bid drawings and the relevant articles in this contract Document.

This specification is intended for general description of quality and workmanship of

materials and finished works. This is not intended to cover minute details. It shall be
specifically understood that the work shall be executed in accordance with the best
modern practices and with best quality of materials and workmanship to the entire
satisfaction of the employer. This specification shall generally have precedence in case
anything contrary to this is stated anywhere in the contract document but the decision of
the Employer/Engineer shall be final and binding on the Contractor in respect of any issue
arising out of such discrepancies.

10.01.01 STANDARD AND REFERENCES

All equipment, materials, fabrication, galvanizing, erection and tests under these
Specifications shall conform to the Indian Standard Specifications as amended till date of
issue of invitation of Bid. In absence thereof, the work shall be executed according to the
best prevailing State or Central Public Works Department Practice or as per relevant
International Standards, codes, manuals and specifications or to equivalent applicable
international standards, manuals and Specifications established and approved in the
country of manufacturer and approved as equal by the Employer/Engineer.

If the Contractor for any reasons/purposes equivalents to or deviates from the above
standards, the Contractor shall state the exact nature of the change, the reason for making
the change and shall submit complete specifications of the materials.

WBSETCL Page - 6/88 Sub-station Civil Tech. Specs

10.01.02 LIST OF CODES AND STANDARDS

The following codes and standards as amended till the date of issue of invitation of bid
are to be followed in the design of the architectural, Civil and structural works for sub-
stations.

Sl.No. Indian Standards Title

1. IS:209 Specification for Zinc.
2. IS:269 33 grade ordinary portland cement.
3. IS:348 French polish
4. IS:383 Coarse and fine aggregates from natural sources for
concrete.
5. IS:427 Distemper, dry colour as required.
6. IS:428 Distemper, oil emulsion colour as required.
7. IS:432(Part-I & II) Mild steel and medium tensile steel bars and hard drawn
steel wire for concrete reinforcement.
8. IS:455 Portland slag cement.
9. IS:456 Code of practice for plain and reinforced concrete.
10. IS:800 Code of practice for general steel construction.
11. IS:802(Part-I)-1977 Code of practice for use of structural steel in overhead
transmission line towers
12. IS:875(Part-I to V) Code of practice for design loads (other than
earthquake) for building structure.
13. IS:1038 Steel doors, windows and ventilators.
14. IS:1077 Common Burnt Clay Building Bricks.
15. IS:1161/1239 Steel tubes for structural purposes.
16. IS:1172 Code of basic requirements for water supply, drainage
and sanitation.
17. IS:1237 Cement concrete flooring tiles.
18. IS:1346 Code of practice for water proofing of roofs with
bitumen felts.
19. IS:1361 Steel windows for industrial buildings.
20. IS:1443 Code of practice for laying & finishing of cement
concrete flooring tiles.
21. IS:1477 (Part-I&II) Code of practice for painting of ferrous metals in
buildings.
22. IS:1489(Part-I & II) Portland Pozzolana cement.
23. IS:1609 Code of practice for laying damp proofing treatment
using bitumen felts.
24. IS:1786 High strength deformed steel bars and wires for
concrete reinforcement.
25. IS:1892 Code of practice for sub-surface investigation for
foundations.
26. IS:1893 Criteria for earthquake resistant design of structures.
27. IS:1904 Code of practice for design and construction of
foundations in soil general requirement.
28. IS:1911 Schedule of unit weights of building materials.
29. IS:1948 Aluminium doors, windows and ventilators.
30. IS:2016 Plain washers.

WBSETCL Page - 7/88 Sub-station Civil Tech. Specs

 Sl.No. Indian Standards Title
31. IS:2065 Code of practice for water supply in buildings.
32. IS:2114 Code of practice for laying in situ terrazzo floor finish.
33. IS:2116 Sand for masonry mortars.
34. IS:2202(Part- I & II) Wooden flush door shutters (solid core type).
35. IS:2212 Code of practice for brick work.
36. IS:2338(Part- I & II) Code of practice for finishing of wood and wood based
materials.
37. IS:2339 Alluminium paint for general purposes, in dual
container.
38. IS:2395(Part-I&II) Code of practice for painting concrete, masonry and
plaster surfaces.
39. IS:2470(Part- I & II) Code of practice for installation of septic tanks.

40. IS:2527 Code of practice for fixing rainwater gutters and down
pipes for roof drainage.
41. IS:2571 Code of practice for laying in situ cement concrete
flooring.
42. IS:2629 Recommended Practice for Hot-Dip Galvanising of Iron
and Steel.
43. IS:2633 Method of testing uniformity of coating on zinc coated
articles.
44. IS:2950 Code of practice for design and construction of raft
foundations.
45. IS:2974 Code of practice for design and construction of machine
foundations.
46. IS:3063 Fastners - Single coil rectangular section spring
washers.
47. IS:3370(Part-I to IV) Code of practice for concrete structures for the storage
of liquids.
48. IS:4021 Timber door, windows and ventilator frames.
49. IS:4326 Code of practice for earthquake resistant design and
construction of buildings.
50. IS:4759 Hot-dip zinc coating on structural steel and other allied
products.
51. IS:5410 Cement paint.
52. IS:5624 Foundation Bolts.
53. IS:6248 Specification for metal rolling shutters and rolling grills.
54. IS:6639 Hexagonal bolts for steel structures.
55. IS:6745 Methods for determination of weight of zinc coating on
zinc coated iron and steel articles.
56. IS:12427 Transmission Tower Bolts.
57. NBC:1983 National Building Code of India 1983.
58. IS:5411(Part I & II) Plastic emulsion paint.
59. IS:2911(Pt.I,Sec.2) Code of practice for design and construction of pile
foundations : concrete piles - Bored Cast-in-situ piles.
60. IS: 7452 Specification for steel door
61. IS: 13757 Specification for Burnt Clay Fly Ash building bricks.
62. IRC Codes

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10.02 SCOPE OF WORK

A. GENERAL :

The scope of all civil and structural works shall include preparation of design,
detailing, fabrication, galvanizing, supply of all materials, labour, plant and
equipment, fixtures, fitting, erection and all temporary and permanent works
necessary for the satisfactory completion of the job in respect of the major item of
work listed below for each Sub-station as per requirement:
Site survey and setting out, assessment of condition and requirements and collection
of necessary site data.

Land development

Geo technical Investigation.

Electro logging and exploratory boring work for drinking water supply etc.
Approach road, precast concrete pipe culvert, R.C.C. culvert.
Switchyard fencing and gates.
Sub-station galvanized steel structures.
Foundation of steel structures, equipments and erection of the same.
Control building / integrated building.
Cable trench system.
Rail cum road/road portion connecting nearest bituminous road and
transformer/reactor plinth as per requirement.
Oil soak pits, oil/water sump, sump pump house & pump etc.
Water supply and plumbing system comprising of sinking of deep tube well, pump
house with suitable pump, R.C.C. overhead reservoir if required etc.
Storm water drainage system with sump pump house & pump etc.
Boundary wall with M.S. Gate etc. (Manually/electrical motor operated as per
requirement).
Residential Buildings (C type, Dormitory etc.) as per requirement.
Store Shed with office, Security Office as applicable.

Fire Fighting Reservoir & pump house as per electrical Technical Specification &
requirement.

Fire isolation walls between Transformers, if required

Site clearance after completion of work.
N.B. However, item of work to be executed in respect of the substation would be as
per the indicative schedule of works.

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10.03 WORK SCHEDULE:

The Contractor shall submit to Engineer a graphical work schedule with an explanatory
report before starting of the construction job. The work schedule and any amendments to
it during the construction period will require Engineer's approval.

10.04 DESIGN AND DRAWINGS:

GENERAL:

The Contractor shall submit detailed design calculations of all civil works (excluding
steel structural work within 400kV, 220KV, 132KV, 33 kV switchyard) as required. All
drawing shall be submitted in proper sequence as would be approved by WBSETCL.

10.04.01 DESIGN OF CIVIL WORKS :

The Contractor shall perform detailed design for each structure described in article 10.02
on the basis of the design criteria and codes and regulations of Indian Standards. Prior to
proceeding with the design work, design condition or design values which shall include
allowable stresses, safety factors, load conditions and applicable standards shall be
approved by the Employer/Contractor.

The Contractor shall submit to Engineer corresponding detailed design calculation sheets,
bill of materials, construction methods and construction schedules etc for approval of
construction drawing of each structure. In case of any subsequent modification of detailed
design of civil structural/architectural work, the Contractor shall promptly inform
Employer/Engineer of such modification and shall submit modified drawings to Engineer
for approval. All design calculation along with drawings will be sent back to contractor
on its approval keeping each of the copies duly with WBSETCL.

DRAWING OF CIVIL WORK:

Separate drawings shall be prepared and submitted for architectural, Civil, Structural &
foundation works for building, structures and equipment pertaining to each Sub-station.
All drawings to be furnished by the Contractor shall be in standard size of sheets with
maximum size being A0. Drawings shall contain the following particulars in the title
block at lower right hand corner in and addition to the name of Sub-station
name, title, drawing number and date, consultant's name and signature, revision no. etc.
a) Client : West Bengal State Electricity Transmission co. Ltd.
b) Project Title : Transmission System Packages

A blank space of size 100 mm x 100 mm. shall be provided for the Engineer's approval
stamp and provision shall also be made by way of a block for details of revisions to be
recorded. The drawing shall be marked with subsequent revision no. & date of revision
every time the drawing is revised.
On receipt of the approved electrical layout drawing of each Sub-station, the contractor
shall submit to the Engineer Six copies of detailed construction drawing of structures and
foundation designs, along with six copies of detailed drawings for review purpose if and
where required. The contractor shall ensure that the contents of copies of drawings are

WBSETCL Page - 10/88 Sub-station Civil Tech. Specs

 legible and complete with detailing. Drawings that are not legible or incomplete will not
be accepted. Two sets of drawings duly approved by the Engineer shall be furnished to
the Contractor. Drawings returned with "not approved" / "approved with comments" shall
be resubmitted with revision number and date for approval till final approval is obtained.
After obtaining approval, the Contractor shall immediately submit to the Engineer eight
copies of the said drawing as distribution copies

Approval of such detailed drawings by the Engineer shall not relieve the contractor of his
responsibility for correctness nor of any of his obligations to meet the other requirements
of the contract. The contractor shall be fully responsible for the safety of the building and
the structures from design, construction and erection points of view even after the
approval of the drawings are communicated by the Engineer. The contractor shall take all
necessary precaution for the safeguard of all existing structures during execution of the
contract. The contractor shall also make good all damages, if cropped up, within contract
period including the risk liability period at his risk and expense. In all cases, the new
structures, must match with the existing structures, for an extension Substation.

10.04.02 CONTRACT DRAWING :

The drawing bearing the Engineer's approval or drawings corrected in accordance with
the comments of the Engineer shall be deemed to be contract drawings and variation
therefore may not be made without the Engineer's consent.

The design and drawings approved and used for the work under the scope of this contract

to the contractor and without any additional charges for such reuse.

10.04.03 AS BUILT DRAWINGS :

Six sets of "as built drawings" duly certified by site engineer(s) of WBSETCL and Project
Manager of contractor conveniently bounded along with one set of reproducible copy and
CD of all such drawings shall be supplied by the contractor within a period of 30 days of
completion of the work at site.

10.05 SURVEY AND SETTING OUT:

The contractor shall conduct topographical Survey and furnish Survey drawings of entire
Sub-station land showing exact boundaries and spot levels dividing entire land area in
10Mx10M grids.

Master Grid pillars are to be constructed at four corners of substation land, for fixing the
two right angled base lines. On the basis of them, other grid lines are to be marked out.
Before commissioning of the Sub-Station, F.G.L as indicated by the site Engineer of
WBSETCL shall have to be achieved by the contractor as final finishing where the land
development was undertaken by WBSETCL.
The contractor shall prepare "land utilization plan drawing " of each Sub-station showing
location of control building, switchyard, staff colony area, access roads and other
permanent features including orientation of site with respect to magnetic north. Upon

WBSETCL Page - 11/88 Sub-station Civil Tech. Specs

 approval of the Employer on the final L.U.P. drawing, the structural and building
foundation, fencing and boundary wall, gates, approach roads etc. shall be set out
accurately by the contractor on the ground.
Property line marking by RCC pillar of size (150mmX150mmX1000mm) by grouting
PCC 1:3:6 at every corner of the property and 50M interval on each side. The top of the

10.05.01 LAND DEVELOPMENT WORK:

A considerable portion of different sub-stations areas are either low lying or filled up
land. The Contractor shall carry out land development work up to the required formation
ground level (F.G.L.) for entire sub-station area within the property line including colony
and approach road as per approved drawings and as directed by the engineer.

F.G.L. of each sub-station shall be finalized considering the level of the nearest State
High Way and/or with respect to the existing plinth level of nearby Govt. utilities e.g.
School, College or other similar permanent structure and H.F.L at that area whichever is
higher or as mentioned in the schedule of works.

For extension Sub Station, F.G.L. shall be at par the same of the existing portion of the
Sub-Station.

The plot area shall be cleared of trees, plants, logs stumps, bush, vegetation, grass weeds,
roots, rubbish, slush etc. and all other objectionable matter prior to commencements of
land development work.

The contractors shall carry out land development work up to the required formation
ground level (FGL) for sub-station as per approved drawing and as directed by the
engineer in charge. Filling, whenever required, shall be carried out with earth / fly ash in
layers not exceeding 250 mm in thickness by approved compaction equipments such as
Dozers and Graders followed by 08-10 ton Power roller etc. before the next layer is
deposited. Where mechanical compaction is not possible such as in pond/ditches, manual
compaction is to be done in layers not exceeding 150 mm thick with the same rate as of
the schedule of the work. In case of filling with fly ash, after ensuring the compaction of
the same 500mm thick earth cushioning is to be provided as top layer.
The existing ground bed is to be properly leveled with 08-10 ton power roller prior to
taking of pre-work level of ground profile.

In case of filling by earth, at every layer of 250 mm thickness, the compaction is to be

ensured such that 100 M3 of loose filling 3
of compacted fill with 6 nos
of 08-10 ton power roller pass or as directed by the engineer-in-charge to achieve
compaction as mentioned. There will no consideration for any settlement / depression in
ground / pre-work level owing any reason what so ever in the volume computation.

The FGL is to be finally achieved (with the excavated excess earth / fly ash obtained from
foundation of various structures) as directed site-in-charge.

The heaped earth/fly ash if any, lying inside the sub-station area (bounded by the property
line), shall have to be re-used / removed as per instruction of site-in-charge.

The final surface shall be trimmed and leveled to correct profile as required.

WBSETCL Page - 12/88 Sub-station Civil Tech. Specs

10.06 GEOTECHNICAL INVESTIGATIONS & PARAMETERS:

The Contractor shall prior to execution of geotechnical investigation work submit a list
of names of at least five investigating agencies of repute to whom the geotechnical
investigation work would be sublet and plan the investigating work including test items,
quantities, applicable standards, test procedure and schedule of work for the approval of
the Engineer. The Contractor shall perform the investigating work according to approved
plan and details of test. Report on test results including various data collected during
investigating work and placed to the Engineer for approval.

The geotechnical investigation for assessing bearing capacity and settlement

characteristic of soil determining shrinkage and swelling properties, suitable type, size of
foundation and foundation levels for structures, equipments, tower, control building and
staff quarters shall include sinking of minimum 8 (eight) nos. of 150 mm diameter of bore
holes of minimum 20 M. depth or upto refusal strata whichever is earlier for the sub
station. The bore hole shall be located in the following specific areas:
1) One at Transformer locations.
2) One at different take-off structure foundation locations.
3) One in the Control Room Building/Integrated Building area.

However, the number of bore holes and minimum depth of boring for Sub station shall be
finalized in consultation with the engineer. The boreholes shall be backfilled by the
Contractor after completion of investigation work.

The entire work shall be carried out as per relevant Indian Standard Specification.

Every undisturbed Sample (UDS) and disturbed sample (DS) collected from the
boreholes shall include but not limited to the following series of tests only.

-----------------------------------------------------------------------------------------------------
Tests : Applicable to
-----------------------------------------------------------------------------------------------------
Natural moisture content : UDS
Atterberg limit : UDS & DS
Sieve analysis : UDS & DS
Unit weight : UDS
Specific gravity determination : UDS & DS
Unconfined compression test : UDS
Unconsolidated untrained triaxial strength : UDS
Consolidation test : UDS
Moisture- density relationship corresponding : DS
To compaction required for grading/back
Filling work.
------------------------------------------------------------------------------------------------------
The geotechnical Investigation shall also include determination of electrical resistivity of
soil in the switch yard area as per requirement.

The contractor shall perform Electro logging and detailed exploratory boring work for
drinking water supply required for entire sub-station and colony areas to ascertain the
depth of permanent and potable water bearing strata. The requirement of drinking water
for various types of new sub-stations is as follows:

WBSETCL Page - 13/88 Sub-station Civil Tech. Specs

 132 KV Sub-station-20,000 liters/day
220 & 400 KV Sub-station - 30,000 litres/day

Necessary test certificates regarding potability of drinking water is to be furnished by the

contractor from the test laboratory approved by the Engineer.

10.07 SUB-STATION ROADS :

The height of Road crown shall be 300mm from F.G.L.
The contractor shall design and construct all roads within the sub-station and switchyard
area considering CBR value as 4 (in soaked condition). The tentative requirement of the
roads shall be as follows :
a)
i) 400 kV Sub-station
The road (Bituminous) connecting the existing outside main road and diversion bend,
if any, nearest to the switchyard gate extended up to 400KV switchyard area as per
approved L.U.P shall be of 7.5M width.

ii) 220 and 132 kV Sub-station

The road (Bituminous) connecting the existing outside main road and diversion bend,
if any, nearest to the switchyard gate shall be of 5M width.

b) i) The bituminous road lying within switchyard area and connecting the 7.5M/5 M
wide road shall be 4M width as shown in the L.U.P drawing.
ii) The road serving the breaker location within switch-yard at 400 KV & 220 KV
sub-stn. connecting the 4m wide road shall be of 3.75m width.

c) The bituminous road connecting office, store-cum-garage, store, security barrack etc.
within sub-stn. area shall be of 4.0m width.

d) The bituminous road to the colony area and serving the colony area shall be of 4.0 m
width.

e) The road type and thickness etc. of all the above roads shall be as per Road Layout
drawing and the design shall be as per load requirement.

f) Connecting pavements :
Pavements connecting bituminous road with staff quarters, pump houses and other
structures, if and where required as per L.U.P. drawing shall be 2 M. wide, 100 mm
thick PCC (1:3:6) over single layer B.F.S. placed on 150 mm thick sand filling with
removal of earth along the pavement with necessary chillchaling, leveling & dressing
to match with Road and Bldg front levels.
Necessary protection for retention of sand by suitable wall shall have to be made.
g) Decorative Paver Blocks need be used wherever necessary to cover the exposed
surfaces as per instruction of Engineer in Charge.
However, the entire road shall be executed as per detailed Road Layout drawing of the
sub-stn. to be decided during detail engineering.

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10.07.01 BOX-CUTTING:

After the earth work in cutting and the earth work in embankments have been done
properly upto the final road level with gradient and camber as per drawings and proper
consolidation of the filling is completed, earth work in box cutting shall be taken in hand.

The box cutting shall be done in such a way that width of cutting is exactly the clear
distance between the edging blocks. The depth of cutting shall be the total thickness of
soling, metalling etc. The formation shall have the same profile and the camber as per
drawings and specifications.

If by mistake the box-cutting is made more than required, the Contractor shall made up
the extra depth by metal consolidation, at his own cost.

After the box-cutting is completed, the formation shall be rolled with power roller,
maintaining proper gradient and camber, care shall be taken to avoid excessive rolling of
the formation.

If after rolling the formation is higher than required, the excess earth shall be removed by
carefully cutting & dressing and the formation shall be rolled as specified above. In case
after rolling the formation is depressed below the required level, the Contractor shall
continue the process of filling and rolling as above till the correct levels is attained.

10.07.02 EDGING:

Concrete (1:2:4) edging blocks shall be of size 500(L) x 500(W) x 100(Th.).

After rolling of the box-cutting trenches, the finished depth of cutting shall be minimum
and just sufficient to insert the edging blocks. The clear width between the inside faces, of
the edging blocks shall be exactly the same as shown on drawing. The inside faces shall
be in plumb and the gap between the blocks shall not be more than 10 mm. The edging
blocks shall be thoroughly packed with a mixture of local earth and moorum at the
outside face.

If, after consolidation of stone metal, any portion of the edging is found to be out of the
lines & level, the Contractor shall take out the blocks and relay the same as required.

10.07.03 SOLING:

The soling shall be done with rough laterite-boulders/stone boulders or Jhama Brick bats
as approved by the Engineer. The soling materials shall be tough and it shall not flake or
crumble when being rolled with power roller. Soling thickness shall not be less than 75
mm or shall not be more than the depth of soling as specified in drawings.

The soling shall be laid on its narrowest side closely on the formation, so that minimum
voids are left between the adjacent blocks. The filling of bigger voids shall be done by
wedging in smaller pieces of stone with hand hammer. The smaller void shall be filled up
with blinding materials. The blinding materials shall be sufficient to fill up all voids and
produce an even surface after rolling. Excess use of blinding materials shall be avoided.

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 The rolling should be done with power roller in such a way that the whole soling gives a
compact base without any voids. If voids are not filled up further blinding materials shall
be added. The rolling shall be continued till there is no settlement or voids and surface is
truce and even. The finished soling shall have the correct thickness, gradient and camber
as specified in drawing/direction.

If the Engineer finds that the soling done is not up to the specification, the whole soling
over the defective portion shall be taken out, re-laid and compacted with a power roller as
specified above by the contractor.

10.07.04 PRECAST CONCRETE PIPE CULVERTS:

N.P.3 class precast concrete pipes of required diameter as per I.S.458 shall be supplied
and laid in positions in lines and levels under the approach road.Such pipes shall have to
be laid over 150mm wide and 75mm thick P.C.C(1:3:6) across the length of the pipe.
Jointing of pipes and collars in cement concrete (1:2:4) etc. complete shall be done as per
I.S.783 and as approved by the Engineer. The pipes shall have adequate strength to resist
the anticipated traffic load. Minimum depth of well compacted earth cushioning over pipe
culvert shall be 1.00 M.

10.07.05 WATERBOUND MACADAM :

The Coarse aggregades shall be either crushed or broken stone and over burnt(jhamma)
brick agreegates as approved by Engineer in charge of approved size, grading and quality.
The material shall be of close, tough, durable and shall not flake or crush under pressure.
The material shall be of high density, and shall not preferably absorb when immersed in
water for 24 hours, more than 1% of own weight. In general, unless otherwise specified
the material shall conform to the standard laid down by the "Indian Road Congress"
regarding toughness, abrasion co-efficient of hardness, alternation loss and cementation
values. The Grading requirement of Coarse aggregates is given below.

Grading Size range Sieve Percent by Compacted

designation weight passing thickness.
the sieve.
1. 90mm to45mm 125mm 100 The compacted
90mm 90-100 thickness of each
63mm 25-60 layer 100 mm.
45mm 0-15
22.4mm 0-5
2. 63mm to 45mm 90mm 100 The compacted
63mm 90-100 thickness of each
53mm 25-75 layer 75 mm.
45mm 0-15
22.4mm 0-5
3. 53mm to 63mm 100 The compacted
53mm 95-100 thickness of each
22.4mm 45mm 65-90 layer 75 mm.
22.4mm 0-10
11.2mm 0-5

Screenings to fill voids in the coarse aggregate shall generally consist of the same
material as the coarse aggregate.

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 Approved quality Binding materials shall be used for water bound macadam as a filler
material.

The coarse aggregate shall be laid to camber & profile in such a way that the total
thickness of loose metal over soling is not less than 150 mm if required to make the
consolidated thickness to 100 mm after rolling. While spreading the metal proper profile
and camber shall be maintained and checked with templates at every 10 M.

10.07.06 DRY ROLLING:

After metal have been laid and dressed as above, metals shall be rolled dry with a 10 Ton
road Roller until well compacted and there is no appreciable movement of the stone or no
appreciable wave in front of the advancing roller and no lines of roller are left on the
surface. Excessive dry rolling should also be avoided.

When the desired degree of compaction has been obtained by dry rolling, screening of
approved chipping 12 mm down in size should be spread uniformly over the surface by
brooming and this should be pushed into the interstices by rolling successive layers of
evenness observed shall be rectified by removing stone up to a depth 50 to 75mm refilling
the same hand packing and revolling. No watering should be done till this process is
complete. The amount of screening used should not be less than 10 litres per one sq.m.of
road surface.
Rolling operation has to be carefully carried out. Rolling should be done commencing
from the edge for the road and working towards the centre. Roller should be passed equal
and sufficient numbers of times on the metal spread at every stage so as to secure equal
and thorough compaction. Speed of the roller has to be slow and uniform and reversing
shall be quick and free from jerks. As far as possible, the reversing process should be at
different section of the length rolled during each successive trip.

10.07.07 WET ROLLING (WATER BOUND MACADAM) :

When the dry rolling has been completed to the satisfaction of the Engineer, the surface is
to be watered and kept saturated and rolled a few turns as specified above. Approved
quality blindage shall then be spread uniformly over the surface to a thickness of 25 to 12
mm. The roller wheels as well as the road surface should be constantly watered during
wet rolling process. The rolling should be continued until slurry is formed over the entire
surface and the same moves in the form of a wave in front of the roller when the rolling
operation may end and the surface allowed to dry. The finished metalling shall be
minimum 100 mm thick. The finished surface shall be smooth and uniform and free from
waveness and corrugation and as per specified profile and camber.
After 24 hours of rolling the surface shall be sprinkled with a thin layer of sand not less
than 56 lit. per 100 sqm. of surface.
The compaction and finish shall be as per specification and to the satisfaction of the
Engineer in-charge at site finds that the water bound macadam done is not as per
approved drawing, the whole metal over the defective portion shall be taken out, relaid
and compacted as specified above.

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10.07.08 BITUMINOUS BASE AND WEARING COURSE PREMIX CARPET & SEAL
COAT :

Primer coat over granular base:

This work shall consist of application of single coat of low viscosity liquid bituminous
material to a porous granular surface preparatory to any superimposition of bituminous
treatment or mix. The bituminous primer shall be Medium Curing Cutback (MC)
produced by fluxing, in an approved manner, bitumen of 80/100 penetration grade with
kerosene. The cutback shall be free from water and shall not show any signs of separation
prior to use.
Tack Coat:
This work shall consist of application of a single coat of low viscosity liquid bituminous
material to an existing road surface preparatory to another bituminous construction over
it. The normal range of spraying temperature for a bituminous emulsion shall be 20°C-
70°C. for cutback bitumen of grade RC 70/MC 70, the temperature range shall be 50°C-
80°C.
Bituminous macadam:
This work consist of construction, in a single course of 50mm thickness of compacted
crushed aggregates premixed with a bituminous binder, laid immediately after mixing, on
a base prepared previously and in conformity with the lines, grades and cross sections
shown on the drawings.
Premix carpet:
Minimum thickness of bituminous premix carpet shall be 20mm in 1(one) layer. The
existing surface is to be examined with a template and straight edge and all deviations
from the correct profile and grades are corrected by the reconditioning. The existing
surface is also examined for the minimum depth of base and metalling necessary to carry
the traffic load. The surface then to be cleared entirely by means of wire brushes, bristle
brooms and safe brooms so as to expose a clean metal surface with the sundry materials
in the joints remove to a depth of 12 to 6 mm without loosening the stones.
20mm thick open graded bituminous premix carpet by Hot mix Plant as may be required
using stone chips 13.2mm (@ 0.18cum/sqm) and 11.2 mm(@0.09cum/sqm) size stone
aggregates, including thorough cleaning of the surface, applying tack coat, screening,
cleaning and pre heating stone chips and fully pre-coating the same with hot matrix @ 54
Kg/cum of aggregate mix, carrying the mixture by tipper trucks or by any other suitable
arrangements, laying the mixture uniformly over the surface including manual operations
as and when required for proper level grade and camber, thoroughly rolling by power
roller including the cost and carriage of stone chips and matrix, heating the matrix, pre-
heating the aggregates to required temperature including the hire charges of Hot-mix
plant and other machineries, pay of operators, cost of fuel and lubricants etc. all complete.
After sufficient length and area covered the bituminous carpet is compressed by a power
roller of not less than 10/8 ton weight. Rolling is done longitudinally at the sides and then
proceed towards the centre of pavement, over lapping on successive trips by at least one
half of the width of the rear wheel. Rolling to be done until all roller marks are
eliminated. The rolling should always be done slowly so as to avoid displacement of hot
mixture. Any displacement occurred is to be corrected by the use of rakes and of fresh
mixture when required. The rate of rolling should in no case exceed 125 to 175 Sq.m. per
hour per roller and is to be continued until no further compression is possible. To prevent
adhesion of the surface course mix, the roller wheels are to be kept properly moistened.

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 A seal coat with hot matrix and pre-coated stone chips on newly laid black-top surface
shall be applied after thorough cleaning. 6 mm down stone chips, fully precoating the
same with matrix ( tar or asphalt) @ 70 Kg per cum. of stone chips , shall be applied
@ 0.90 cum. per 100 sq.m. of area over the cleaned surface. The surface shall be
thoroughly consolidated with power roller.

Traffic shall be allowed after four days from the day of application of seal coat or as
approved by the site Engineer of WBSETCL.

10.07.09 R.C.C. CULVERT :

The contractor shall design and construct RCC box culvert with wing walls or RCC
bridge at approach to Sub-station and other locations within Sub-station e.g. Road at
crossing drain and cable Trench etc. as required for conveying the heaviest equipment to
and from the Sub-station. The culvert shall provide adequate waterway to cater entire
monsoon flow of the existing natural drain/road side borrow pit. The culvert shall be
designed suitably for Class A or 70R loading whichever causes worst effect. At the entry
point of the Sub-Station the width of the culvert shall be designed in such a manner to
accommodate transition curve of radius 9R/12R as per requirement, approved by the
Engineer. C.C (1:2:4) apron of average thickness 150 mm and 1200 mm wide shall be
provided over single brick flat soling , at both side of R.C culvert at invert level (between
two wing walls).

62.5mm thick wearing course (1:1.5:3) to be provided at the top of culvert. Necessary
weep hole including bats packing (200x200x300mm length) should be provided.

10.08 EARTH WORK IN EXCAVATION, BACK FILLING & CRUSHED STONE

SPREADING / GRAVEL SPREADING:

10.08.01 EARTH WORK IN EXCAVATION:

Excavation shall include the removal of all kinds of soil, loose or compact moorum,
gravel etc. soft and hard rock including laterite rock, schist/gneiss rock etc. required to
properly execute the work and shall be made with sufficient clearance to permit the
placing, inspection and setting of forms and completion of all work for which purpose the
excavation was made and shall be inclusive of all leads and lifts.
All excavations shall be done to the minimum dimensions as required for the safety,
stability and working facility. In firm soil, the sides of a trench shall be kept vertical upto
a depth of 2 meters from bottom and for a greater depth, the trench shall be widened by
allowing steps of 50 cm. on either side after every 2 meters depth from the bottom.
However the contractor shall be responsible for any consequent loss or damage and safety
of the workmen.
Prior to starting excavation, the ground level at the location shall be checked by the
Contractor in presence of site Engineer of WBSETCL.

If the excavation is done to a depth greater than that shown on the drawing, due to
contractor's fault, the excess depth shall be filled upto the required level with C.C. not
leaner than 1:4:8.

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 Excavation shall not be carried out below the foundation level of the adjacent buildings
until necessary protection works e.g. under pinning, shoring etc. are done as per
instructions of Engineer. Cost of such protection work shall be borne by the contractor.

The contractor shall be solely responsible for assumptions and conclusions as to the
nature of materials to be excavated and the difficulty in marking and maintaining the
required excavation and performing the work in accordance with the specifications. Cost
of shoring, bracing, dewatering and bailing out water from excavation manually or by
using pumps / well points dewatering during excavation of the work shall be included in
the bid.

The contractor shall maintain dry working condition inside excavation pit for placement
of shuttering, reinforcement and concreting etc. below subsoil water level. All
excavations shall be kept free of water and slush. The contractor shall remove by
pumping or by other means, approved by the Engineer, any water inclusive of rain water
and subsoil water accumulated in excavation pit / trench until the construction of
foundation structure and back filling are complete in all respect. Sumps made for
dewatering must be kept clear of the foundations.

Foundations at higher depths shall be completed before execution of the shallow depth
foundations.

10.08.02 BACK FILLING:

The material used for back filling shall be free from lumps & clods, roots and vegetations,
organic materials, harmful salts and chemicals, stones, concrete etc.
Earth fill around the foundation structures, columns and below floors shall commence
after the structures have been inspected and approved by the site Engineer of WBSETCL.
Prior to earth fill forms, temporary shoring, debris, brick bats etc. shall be removed.
Earth fill shall be placed in horizontal layers not exceeding 150 mm in thickness. Each
layer shall be watered, compacted and rammed with approved manual / mechanical
means.
The final surface shall be trimmed and leveled to proper profile as required as per
cl.no.10.07.
Excavated materials not suitable or not required for backfill, shall be deposited in areas as
directed by the Engineer or shall be removed outside the area of Sub-station at a suitable
place arranged by the contractor.
Structures like Cable Trench, Drain, and Switchyard Fencing etc. falling on back filled
soil must be placed over silver sand cushioning of minimum 500 mm thickness.

If the foundation of shallow depth falls on the back filling area of higher depth
foundation, the said back filling up to the bottom of the shallow depth foundation shall be
done with medium coarse sand.

10.08.03 CRUSHED STONE SPREADING FOR SUB-STATION:

The work shall consist of a surfacing course 100mm (min.) thick composed of 40mm
nominal size (ungraded) crushed stone spread uniformly on the whole switchyard area
over 75 mm average thick c.c.(1:5:10) with jhama bricks as per design requirement.

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 Crushed stones shall be tested as per Electrical Specification. For easy drainage of water
the slope of 1:1000 is to be provided in PCC from the ridge to the nearest drain. The ridge
shall be suitably located at the centre of the area between the nearest drains.

CONSTRUCTION METHOD:
The preparation of the area for laying P.C.C. shall be done in such a way that the area is
thoroughly deweeded and cleared of all grass, weeds, roots and all other objectionable
materials.Antiweed Chemicals shall be procured from the reputed manufacturer and the
doses and method of application of chemicals shall be strictly as per manufacturer's
specification and recommendation with the approval of the Engineer in charge.
After antiweed treatment is complete the surface of the switchyard shall be maintained,
rolled,compacted to the lines and grades as decided by the the Engineer in charge.
The subgrade shall be in moist condition at the time of laying of the concrete.
Over the prepared subgrade 75 thick layer of cement concrete in(1 cement:5 sand: 10
Jamma brick aggregate 40mm nominal size) shall be placed.Graded stone aggregate
40mm nominal size can be used in place of jhamma brick aggregate in case of difficulty
in procurement of the same without any extra cost to the employer.A slope of 1:1000
shall be maintained for easy drainage.A layer of cement slurry mix(1 cement : 6 fine
sand) shall be applied uniformly over the cement concrete layer.
A final layer of 100 mm thick stone aggregate of 40mm nominal size shall be spread
uniformly over the cement concrete layer after curing is complete.

10.09 SWITCHYARD FENCING AND GATES:

SCOPE:
This specification covers the furnishing of all materials, labour, equipment, tools and
services for the complete and proper construction of chain link fencing as specified herein
and shown on drawings.

10.09.01 MATERIALS:
All materials shall conform to the relevant Indian Standards Specification (latest
revision).

10.09.02 DESIGN :
Sub-station fencing shall be of galvanized steel chain links 1.9 M height conforming to
IS: 2721 over 600 mm height brick masonry wall thus making an overall height of 2.50 M
from F.G.L.Two coats decorative cement based paints are to be applied over the plastered
surface.
All galvanized steel chain link fabric shall be of 8G with nominal mesh size of 75x75 mm
and shall be fixed on M.S. angle frame with M.S. angle or flats of suitable size with bolts
and nuts. The said fencing shall be placed on brick masonry wall 600 mm high above
ground level. The fencing shall be strutted by suitable M.S. angle struts on R.C.C. pillars
at required intervals to correct line and level. Grouting of posts and struts shall be done
with C.C. (M-20) of approved block size.

Strained wire fen - clip shall be constructed when necessary in accordance

with specifications to be approved by the Engineer. Fence Posts shall be of C.C. (1:2:4)
and Stay Posts shall be of R.C.C. of grade M-20 and line wires shall be plain wires of 4
mm dia.

WBSETCL Page - 21/88 Sub-station Civil Tech. Specs

10.09.03 BOUNDARY WALL:

Contractor shall design and construct 2.5 M high boundary wall around entire sub-station
plot as per approved drawing. The boundary wall shall be of R.C.C. of grade M-20 and
250mm thk. brick work (1:4) with cement and sand plastering (1:4) having thickness of
19 mm and 12 mm on the external and internal side respectively.
600mm (+-30mm) diameter R.B.T (Reinforced Barbed Tape) concertina fencing shall be
fitted & fixed on wall top using concertina coils stretched to approx. 6M length clipped
with 3 nos of horizontal R.B.T stands which will be tensioned and fixed with Y shaped
Bracket of M.S. angle (50x50x6) ( of length 900MM(Approx.) from top of wall with
200mm clearance between bottom of concertina and top of the wall) iron posts by means
of security fasteners clips, R.B.T. clips etc.).

Expansion joints shall be provided at an interval of 21 M for straight run or at suitable

junctions of the boundary wall Depth of foundation shall be minimum 1 M from the
original ground level.
In case of raising the height of boundary wall is needed as per requirement, the existing
architectural facade & design shall be maintained as far as practicable with due
consideration of the structural safety of the wall in totality with necessary rectification,
modification and fixing of fencing above the wall as per requirement and painting of
entire wall complete.

Two coats of decorative cement based paint shall be provided on the plastered surface of
the walls. Two coats of synthetic enamel paint of approved make over one coat of primer
shall be provided on steel surfaces. Spacing of R.C.C. columns shall be restricted to 3 M.
For retaining the required height of earth/fly ash filling the lateral load in wall / column or
retaining wall shall be considered during design.

Necessary weep hole with approved filter materials (bats packing etc.) of minimum size
200x200x300 length mm shall be provided.

10.09.04.02 PROTECTIONS

A) STONE (FOR C.R.M., D.R.M. & SAUSAGE WORK) :

All stone boulders to be used in this work shall be of good quality, hard, uniform in size
and shape as far as practicable and dressed properly by hammering and chiseling. It shall
be free from dust, clay and other foreign materials. If so directed by the Engineer-in-
Charge the contractor shall have to arrange for washing of these materials at his cost.

B) MORTAR:

Mortar for C.R.M work shall be of proportion (1:4). It shall be mixed dry until an uniform
colour is obtained and then wetted to proper consistency for use. The mortar shall have to
be consumed within one hour of its mixing. Any mortar that shows a tendency to become
dry shall be rewetted and remixed after adding extra cement (which will be at the cost of
the contractor).

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 C) LAYING OF C.R.M & D.R.M:

All stoned shall be wetted before use. The works shall be carried up truly plumb and to
the specified batter as per approved drawings and direction of the Engineer-in-Charge.
Every stone shall be carefully fitted to the adjacent stone so as to form neat close joints.
The bond shall be obtained by fitting in closely the adjacent stone and by using the bond
stone. Face stone shall extend and bond well into the backing and this shall be arranged to
break the joints as far as practicable as well as to avoid long vertical lines of joints. Chips
shall not be used below the bottom stones to bring these up to the level of the face stones.
The masonry in a structure shall be carried regularly. Where the masonry of one part has
to be delayed the executed work shall be racked back at angles not steeper than 45º.

For C.R.M. work the mortar shall be spread on full width for suitable length of the lower
course. Each stone of the upper course shall be laid to project over the one below both at
the end and at the side, then pressed into the mortar and shoved into final position to
embed the stone and fill its inside face with mortar and the masonry be carried on for the
different layers in the same manner. Leveling up at required finished level as directed by
the Engineer-in-Charge.

D) BOULDER PITCHING:

Boulder pitching work by providing and laying 300mm thick Boulder pitching to sloped
edges of mound with 100 to150mm size Boulders and gaps to be filled with cement sand
mortar 1:4. Suitable Staircases (if required) for movement at suitable locations & toe wall
for necessary protection work as per approved drawing.

E) DISPOSAL OF SPOILS:

The spoils as a result of excavation shall be disposed off by the contractor at any lead and
lifts along the hill slopes evenly by spreading in such a way that the same does not
obstruct the line of flow of jhoras or seepage water. In case of benches where part
excavation and part filling will be involved, the surplus spoils after filling shall also be
disposed off by the contractor in the same manner as above.

No extra charge shall be admissible for removal of the slipped earth in the pit when once
excavated. Shoring and shuttering as approved by the authorized representative of the
purchaser shall be provided by the contractor when soil condition is so bad that there is
likelihood of accident due to the falling of earth. If sand boiling or quick sand condition is
encountered during excavation of foundation pit, the contractor shall take full precaution
and adopt suitable method of construction to complete the foundation at no extra cost to
the purchaser.

Where rock is encountered the holes for tower footing shall preferably be drilled, but
where blasting is to be restored to as an economy measure, shall be done with the utmost
care to minimize the use of concrete for filling up the blasted area. Necessary precaution
for handling and use of blasting materials shall be taken by the contractor as per
provisions of Indian Explosives Manual/Acts. In cases where unnecessarily large
quantities are excavated /blasted resulting in placement of large volume of concrete,
payment for concrete shall be limited to the calculated design volume and balance cost

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 The contractor shall supply the blasting material and be responsible for its proper storing
and use, following relevant rules and regulation of representative authority.

10.09.04 A) M.S. GATE:

Gates for boundary wall and switchyard fencing shall be of M.S. construction of size 8 M
x 2.5M (for 400 KV s/s) / 5.5 M x 2.5 M (for 220 & 132 KV s/s) high, as per requirement,
with a well arranged framework to ensure stiffness and rigidity combined with light
weight.
i) Gate at Main Entrance of sub-station shall be Elec. Motor/manually operated.
ii) Gate at Main Entrance (if manually operated), switch-yard and colony area
shall be two leaved open-able type gate hung from R.C.C. pillars on both sides
and gate leaf shall run on a track at ground level and shall be suitably
supported against toppling when in the closed position. Suitable tracks / guides
shall be provided to ensure smooth travel and shall be operated manually. The
operating mechanism and fixtures shall be sturdy, capable of smooth and rattle
free travel of gate with a minimum of effort and shall be easy to maintain.
The gate shall be provided with suitable locking device. Name and voltage class of
sub-stn. shall be boldly indicated on the gate.

10.09.05 B) M.S. WICKET GATE / TRAP GATE:

MS wicket gate 1200mm X 2500 ht. (manually operated) for 400/220 KV sub-station &
Trap gate of size 1200mmX1500mm high for 220/132 KV sub-station as per approved
drawing shall be provided into the main gate to allow entry & exit of pedestrians with
suitable locking arrangement. It shall be a M.S. Grill Gate of design approved by
Engineer.

10.10 CONCRETE AND ALLIED WORKS:

Concrete work shall mean and include all and every concrete work for the civil work. The
contractor shall perform the concrete work in strict conformity to IS: 456/2000 and as
directed by Engineer and shall inform Engineer at least 24 hours in advance from the time
of scheduled concreting.

10.10.01 COMPOSITION OF CONCRETE:

GENERAL MIX COMPOSITION:

The concrete shall be composed of cement, fine aggregate, coarse aggregate, water and
admixtures as specified. All materials shall be well mixed and brought to the proper
consistency.

NOMINAL MIX CONCRETE:

Nominal mix concrete may be used for concrete of grade M-10, M-15 and M-20. The
proportions of materials or nominal mix concrete shall be in accordance with Table
below. Cement shall be used by weight and not by volume.

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 PROPORTIONS FOR NOMINAL MIX CONCRETE

Grade of Total quantity of dry aggregates Proportion of Quantity of

Concrete by Mass per 50 Kg. of Cement to Fine water per
be taken as the sum of the Individual aggregate to 50 kg of
Masses of Fine and Coarse Aggregates Coarse Cement
(Max.) Aggregate (Max.)
(By Mass)

(1) (2) Kg (3) (4) Litres

M5 800 Generally 60
1:2 but subject to
M 7.5 625 an upper limit of 45
1:1.5 and a
M 10 480 lower limit 34
of 1:2.5
M 15 350 32

M 20 250 30

The detailed mix proportion of concrete producing suitable workability, consistency,

density, impermeability, durability and required strength supported with concrete
compressive strength test results shall be submitted to Engineer for approval.

CONSISTENCY:
The detail mix. proportions shall be submitted to Engineer for approval to secure concrete
of the proper consistency and to adjust for any variation in the moisture content or
grading of the aggregate as they enter the mixer. Addition of water to compensate for
stiffening of the concrete before placing will not be permitted. Uniformity in concrete
consistency from batch to batch will be required.

LEAN CONCRETE:
Lean concrete shall be used under all foundations with the ratio of cement: coarse sand :
stone aggregate equal to 1:3:6. The minimum thickness of the layer shall be 75 mm.

10.10.02 CEMENT:
QUALITY:
Generally cement shall be ordinary portland Cement conforming to IS:269, IS: 8112, IS:
12269 or portland slag cement conforming to IS:455, or portland Pozzolana Cement
conforming to IS:1489. In special cases, rapid hardening portland cement, low heat
cement etc. may be permitted by the Engineer.

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10.10.03 COARSE AGGREGATE:
QUALITY:
Coarse aggregate shall conform to IS: 383 and shall be either natural gravel or
manufactured coarse aggregate. Coarse aggregate shall consist of well-shaped clean, hard,
dense, durable rock fragments and shall not include elongated, flaky or laminated pieces
and any other impurities or deleterious material.

GRADING:
Coarse aggregate shall be graded for each maximum size within the standard limits
specified as follows:

GRADING LIMITS OF COARSE AGGREGATE

PERCENTAGE PASSING FOR GRADED

IS SIEVE
AGGREGATE OF NOMINAL SIZE
DESIGNATION
40 mm 20 mm
80.00 mm 100 -
63.00 mm - -
40.00 mm 95-100 100
20.00 mm 30-70 90-100
16.00 mm - -
12.50 mm - -
10.00 mm 10-35 25-55
4.75 mm 0-5 0-10

10.10.04 FINE AGGREGATE:

QUALITY:

Fine aggregate shall conform to IS : 383 and shall be natural sand or manufactured sand.
It shall consist of clean, hard, dense and durable rock particles, free from injurious
amounts of dust, silt, stone powder, pieces of thin stone, alkali, organic matter and other
impurities.

GRADING:

The fine aggregate as batched shall be well graded and when tested shall conform to the
following limits:

GRADING LIMITS FOR FINE AGGREGATES

PERCENTAGE PASSING
IS SIEVE
Grading Grading Grading
DESIGNATION
Zone I Zone II Zone III
10 mm 100 100 100
4.75 mm 90-100 90-100 90-100
2.36 mm 60-95 75-100 85-100

WBSETCL Page - 26/88 Sub-station Civil Tech. Specs

 1.18 mm 30-70 55-90 75-100
600 micron 15-34 35-39 60-79
300 micron 5-20 8-30 12-40
150 micron 0-10 0-10 0-10

According to IS:383, the fine aggregate (i.e. sand) is graded into four zones. A fine
aggregate whose grading falls outside the limits of any particular grading zone or sieves
other than 600 micron I.S. Sieve, is regarded as failing within the grading zone provided
the total of the excess on the other four sieves is not greater than 5%. Sand of Zones 1 to
3 may be used for concrete work. Zone 4 sand should not be used except in special mixes.

10.10.05 ADMIXTURE:

The contractor shall use admixture in order to improve the quality of concrete or mortar
such as workability and finishability and water tightness in Water retaining structures,
foundation bolt grouting,DPC etc. as per manufacturer's instructions only with the
approval of Engineer. The admixture shall conform to IS: 9103.

10.10.06 WATER:

Water used for both mixing and curing shall be clean and free from injurious materials
such as oil, acids, alkalies, salts, organic materials or other substances that may be
deleterious to concrete and steel. Potable water is generally satisfactory.

10.10.07 STEEL REINFORCEMENT:

The contractor shall place all the reinforcement bars in the concrete structures as shown
on the approved drawings and directed by the Employer/Engineer.

QUALITY:

The reinforcement bars used for concrete structure shall be plain and deformed bars and
shall conform to IS: 432 and IS: 1786. All bars shall be of tested quality.

PLACING :

Reinforcement bars shall be accurately placed and special care shall be exercised to
prevent the reinforcement bars from being displaced during the placement of concrete.
Intersecting points and splices of the reinforcement bars shall be fixed by using black
annealed wires, the diameter of which shall be more than 1.626 mm. The reinforcement
bars in structures shall be placed and supported by use of cover blocks made up of
cement: sand mortar (1:2) duly cured m.s. spacers, or other satisfactory devices to ensure
required coverage between the reinforcement bars and the surface of concrete. Bar
bending schedule shall be submitted to the site-in-charge directly to execute the job
accordingly with a copy to WBSETCL.

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10.10.08 FORM WORK :

GENERAL :

Forms shall be used (including steel forms wherever necessary) to confine and shape the
concrete to the required dimensions, levels, grade etc. lines and as directed by
Employer/Engineer. Forms shall have sufficient strength to withstand the pressure
resulting from placing and vibrating of the concrete, and shall be maintained rigidly in
positions. Forms shall be sufficiently tight to prevent loss of cement slurry from the
concrete. Each form shall be so prepared that each section may be removed individually
without injuring the concrete. All supports and scaffolds should be manufactured from
structural steel/tubular steel except when permitted otherwise by the Engineer.

Faces of formwork coming in contact with concrete shall be cleaned and two coats of
mould oil or any other insoluble, nonstaining approved material applied before fixing
reinforcement. The form work shall be such as to ensure a smooth uniform surface free
from honeycombs, air-bubbles, bulges and other blemishes.

Formwork, during any stage of construction, showing excessive distortion, shall be

repositioned and strengthened. Placed concrete affected by faulty formwork , shall be
removed entirely and formwork should be corrected prior to placement of fresh concrete.

REMOVAL OF FORMS:
The forms shall be removed at the following minimum times after concrete has been
placed as per provision laid down in I.S. 456 - 2000.
Side form of column, beam and wall : 2 days.
Supporting form slabs excluding beams : 14 days.
Supporting form of beams and arches : 21 days.
Whenever required the form work shall be left for longer period than the period
mentioned above.
Before reuse, all forms shall be thoroughly scraped, cleaned, nails/bolts removed, holes
suitably plugged, joints repaired and warped lumber resized to the satisfaction of
Engineer. Contractor shall equip himself with enough shuttering to complete the job in
time.
The contractor shall be responsible for the safe removal of the formwork and any work
showing signs of damage through premature removal of form work shall be rejected and
entirely reconstructed.

10.10.09 BATCHING AND MIXING:

All concrete shall be mixed in a mechanical mixer. The contractor shall provide
equipment and shall maintain and operate the equipment to produce the required quality
of concrete. The mixing shall be continued until there is a uniform distribution of the
materials and the mass is uniform in colour and consistency.
The workability of concrete should be controlled by direct measurement of water content
and shall be checked at regular intervals.

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10.10.10 PLACING OF CONCRETE:

GENERAL:

Prior to placing concrete, the contractor shall submit to Engineer for approval the mix.
proportion, the characteristics of each of the materials of concrete, the concrete placing
schedule, placing equipment and method of execution of work. No concrete shall be
placed until all formwork, treatment of surface, placing of reinforcement and other parts
to be embedded have been inspected and approved by the Engineer.
TRANSPORTING AND CONVEYING:
Concrete shall be transported from the mixer to the formwork as rapidly as possible to
avoid segregation and loss of any ingredient. The concrete which has remained more than
30 minutes after being discharged from the mixer and/or in which slump loss exceeds 3.0
cm. as it is delivered to the site for placing shall be disposed off at the place designated by
Engineer. All such waste concrete shall be at the contractor's account. Concrete shall be
placed with a vertical drop not greater than 1.0 m except where suitable equipment is
provided to prevent segregation or where specifically authorized.
Concrete which has segregated during transportation shall be remixed.

PLACING:

After the surface of unformed construction joint has been cleaned and the placing of
concrete has been approved by Engineer in accordance with the provisions of the
preceding sub-articles, surface of unformed construction joint shall be covered with a
layer of mortar approximately 1.5 cm. thick. The contractor shall place concrete upon the
fresh mortar before it begins to set.

When it is necessary to deposit concrete under water 10% more cement required than that
for the same mix placed in dry.

Concrete shall be deposited in all cases, as nearly as practicable, directly in its final
position and shall not be caused to flow such that will permit lateral movement or cause
segregation of the coarse aggregate, mortar or water from the concrete mass.

COMPACTION:

Immediately after placing, every layer of concrete shall be consolidated to the maximum
practicable density so that it fits snugly against all surfaces of reinforcement bars and
embedded fixtures and against all corners of the forms. Consolidation of concrete shall be
done by electric or pneumatic power-driven, immersion type vibrators or other approved
means. Over vibration and under vibration shall be avoided.

10.10.11 CONCRETE CONSTRUCTION TOLERANCE:

Variation in alignment, grade and dimensions of the structures from the established
alignment, grade and dimensions shall be remedied or removed and replaced by the
contractor as per approved drawings and direction of Engineer.

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10.10.12 CONSTRUCTION JOINTS:

Concreting shall be carried out continuously up to construction joints, the position and
arrangement of which shall be predetermined in the drawing.

When work has to be resumed on a surface which has hardened such surface shall be
roughened. It shall be cleaned, thoroughly wetted and covered with a 12 mm layer of
mortar composed of cement and sand in the same proportion as that of cement and sand in
concrete mix. This 12 mm layer of mortar shall be freshly mixed and placed immediately
before pouring of fresh concrete.

When the concrete has not fully hardened, all latence shall be removed by scrubbing the
surface with wire brush, care being taken to avoid dislodgment of particles of aggregate.
The surface shall be thoroughly wetted and all free water removed.

The surface shall then be coated with neat cement. The first layer of fresh concrete on this
surface shall not exceed 150 mm in thickness, and shall be well rammed against
formwork, particular attention being paid to corners and close stops.

10.10.13 REPAIR OF CONCRETE:

The contractor shall repair at his own expense the imperfections of concrete surfaces and
the irregularities which do not meet the specified dimensions. Repairing work shall be
performed and completed within 24 hours after the removal of forms as per standard
practice.

10.10.14 PROTECTION AND CURING OF CONCRETE:

Newly placed concrete shall be protected by approved means from rain, sun and wind.
Concrete placed below ground level shall be protected against contamination from falling
earth during and after placing.

As soon as concrete has hardened sufficiently, it shall be covered either with sand,
hessian, canvas or similar materials and kept continuously wet for at least 14 (fourteen)
days after final setting. Curing by continuously sprinkling of water may also be allowed
with adequate arrangements made by the contractor.

10.10.15 TESTS :
The contractor shall make all necessary tests for determining the mix proportions of each
type of concrete, including tests of aggregates, so as to produce the concrete specified in
Item 'Composition of Concrete'.
In order to control the quality of concrete to be placed, the contractor shall perform the
following tests.
SLUMP TEST :
A slump test will be made from each of the first three batches mixed each day. An
additional slump test will be made for each additional 40 cubic meters of concrete placed
in any one day . Slump will be determined in accordance with IS:1199.

WBSETCL Page - 30/88 Sub-station Civil Tech. Specs

 COMPRESSION TEST :
Two sets of three concrete compression test cubes 150 mm x 150 mm x 150 mm each will
be made every day when concrete is placed. One set of each group will be tested at an age
of 7 days and the other set will be tested at an age of 28 days.
Samples from fresh concrete shall be taken as per IS: 1199 and cubes shall be made,
cured and stored and tested in accordance with IS:516. The test strength of the sample
shall be the average of the strength of three specimens. The individual variation should
not be more than +/- 15 percent of the average.

10.10.16 READY MIX CONCRETE :

The Contractor shall buy the RMC from approved manufacturer. The Contractor in
association with the manufacturer will make a suggested trial mix correct water cement
ratio, slump and workability. To verify this, the test cubes from the concrete used should
be made and tested. The tests results will determine the cement content and water ratio
that produces the required strength. If the test result satisfies the WBSETCL this mix
design shall be followed throughout the work for RMC work, until and unless there is
variation in shape and size of coarse aggregate, fineness of the fine aggregate, cleanliness
moisture content etc. the design mix as per stipulated strength of concrete mentioned in
this technical specification shall be approved by the Engineer in Charge.

RMC will be supplied by the manufacturer at site from a mixing area by transit mix
trucks. The Contractor will get assurance from manufacturer that initial setting will not
start during the distance to be travelled from batching plant to job site. Again the
Contractor will take a written statement from the manufacturer that within which time
concrete should be delivered and discharged from transit truck mixer after the
introduction of water to cement and aggregate and when the initial setting will start.

The manufacturer will also ensure that transit mix truck will discharge concrete with
slump designated for the job. The time period between the discharge and placement in
position should also be worked out and got approved.
Regular mandatory tests on the consistency and workability of the concrete after
transferring from transit mix trucks at job site shall be done to achieve the specified
compressive strength of concrete.

Regular cube tests in the multiple of six (three for 7 days and three for 28 days
respectively) are to be carried out as per IS: 456 (latest edition) and the works to be
carried out as per stipulations laid in IS codes and clearance by WBSETCL shall be
deemed as final in this regard.

10.10.17 ACCEPTANCE CRITERIA:

Acceptance criteria of the concrete shall be guided by the provisions of IS: 456.
10.11 SUBSTATION STEEL STRUCTURES:

GENERAL:
The contractor shall assume full responsibility for supply, fabrication and detailing, if
required of the steel structures and for their satisfactory performance. All detail drawings

WBSETCL Page - 31/88 Sub-station Civil Tech. Specs

 for 33kV 132 kV, 220 kV & 400 kV sub-station shall be supplied to the successful bidder
by the Employer/Engineer. However, the contractor shall have to submit the construction
drawings to the Engineer/Employer solely prepared on the basis of these supplied
drawings. Equipment Structure drawings, supplied by the employer, shall have to be
modified to suit to the approved GA drg. of the equipments and sectional elevation drg. of
switch-yard and to be submitted to Engineer for approval. For Equipment support
Structure the minimum size of Leg members shall be 65X65X6 and Bracing members
shall be 45X45X5 Angle sections. In the event of substitution of M.S. sections by higher
sections no cost implication will be entertained.

Single line diagram of two tier gantry will be handed over to the successful bidder. The
bidder has to develop and submit the structural drawing, shop drawing (both in hard
copies and soft copies) and proto corrected BOM.
The contractor shall supply all materials, deliver the same to site, and provide all labour,
erection plant and equipment, fixtures, fitting and all temporary and permanent works
necessary for satisfactory completion of the job in all respects.

No omissions or ambiguities on the drawings or in specifications will relieve the

contractor from furnishing best quality of materials and workmanship. Should any
inaccuracies be found, the contractor shall promptly notify the Employer/Engineer
without carrying out the job and no further work shall be done before these discrepancies
are corrected. Continuation of further work shall be done only after such discrepancies are
rectified at contractor's risk and responsibility.

10.11.01 MATERIALS:

The materials shall conform to the following requirements:

All Structural Steel Materials to be used in construction within the purview of the
specification shall comply with:

IS:2062 - Structural Steel (Grade-A) (fusion welding quality) and manufactured by Prime
Rollers e.g. SAIL/TISCO/IISCO/RINL or approved Rollers. In case of MS sections not
manufactured by prime rollers or such sections are not available with prime rollers the
same is to be procured from approved conversion agents. In such case, prior approval of
the Engineer is to be obtained by the contractor. Successful bidder on receipt of structural
drawing from department shall submit within 15 days, a detailed raw material
procurement plan indicating MS section-wise producers name to the Engineer for
approval. On according approval in this aspect, work for fabrication protos shall be taken
up in hands.

Entire fabrication job of MS structures shall not be entrusted to more than two sub-
vendors. Further, a list of bonafide fabricators, not exceeding 6 (six) shall be furnished to
the Engineer for according approval within 15 (fifteen) days from the date of handing
over of drawings. WBSETCL reserves the right to inspect the premises of fabricator prior
to accord approval.

All electrodes to be used under the contract shall comply with any of the following Indian
Standard Specifications as may be applicable.

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 i) IS: 814: Covered electrodes for metal arc welding of Structural Steel.

ii) IS: 815: Classification and coding of covered electrodes for metal arc welding of
mild steel and low alloy high tensile steel.

iii) IS: 144: Covered electrodes for the metal arc welding of high tensile structural
steel.

All bolts and nuts shall be of grade 5.6 HRH and shall conform to the requirements of IS:
6639 and IS: 1367 and galvanizing quality shall be as per IS: 1367. All bolts and nuts
shall be of minimum diameter of 16 mm unless otherwise stated. All mild steel for bolts
and nuts when tested in accordance with the following Indian Standard specification shall
have a tensile strength of not less than 44 Kg/Sq.mm. and a minimum elongation of 23
percent on a gauge length of 5.6 A, where `A' is the cross sectional area of the test
specimen -
i) IS: 1367: Technical supply conditions for threaded fasteners.
ii) IS: 1608: Method for tensile testing of steel products other than sheet, strip, wire and
tube.
Washers shall be made of steel conforming to IS: 226, IS: 961 as may be applicable under
the provisions of the contract and shall be electro galvanized.

10.11.02 DESIGN CONSIDERATIONS:

a) DEAD LOADS:

Self weight of structures plus the weight of equipment including impact load and load
from conductors, insulators etc. as applicable for the design of foundations for
different sub-station structures.

b) LIVE LOADS :

Generally, live loads shall be considered in accordance with I S 875. The loads listed
hereunder are minimum loads specific mentioned areas related to other civil works.

h) Roof (Control/Integrated Bldg. & other buildings.) : 150Kg/Sq.m.(if.not

mentioned specially during Tendering)

ii) Roof (office portion of Control building, if single storied): 300 Kg/Sq.m.

iii) Floors (Control-office portion & other buildings.) : 300 Kg/ Sq.m.

iv) Floors (Control Room, Battery & PLCC Room if not at Gr.Floor):750 Kg/ Sq.m.

v) Floors ( G I S Room / 33 kv Switchgear room ) : 1000 Kg/ Sq.m.

vi) Stairs and balconies (Control buildings only) : 400 Kg/ Sq.m.

vii) Culvert & R.C.C. Pipes : IRC Class-A loading or 70R

whichever causes worst effect.

WBSETCL Page - 33/88 Sub-station Civil Tech. Specs

 viii) Cable trench and sump pit etc. : Earth pressure/water pressure as
applicable

ix) Cover of cable trench : To be designed for a live load of

1000 Kg/sq.m.(Minimum RCC
slab thickness =100 mm. for width 900mm & above)

c) WIND LOAD:

Wind load on structures, trusses, equipments conductor, insulator etc. shall be

assessed as per IS802:(part-I)1995 with wind pressure of heavy zone for strung type
structures and IS875(latest) with basic wind speed of 50 m/sec for all equipment
structures.

d) SEISMIC LOAD:

The lateral forces shall be established in accordance with recommendation of IS1893.

The basic horizontal Seismic coefficient shall be adopted as per the above code.

10.11.03 COMBINATION OF LOADS:

For the design of the steel structures & foundations, simultaneous application of loads
should be assumed such as to produce the maximum stress in any member for the
worst combination of loads.

10.11.04 CONNECTIONS:

a) BOLTS:
All connections shall be bolted with 16 mm bolts.

b) SPLICES:
Splicing shall be avoided unless the length of a member exceeds 6.0 m or so. The
member of splices shall be limited to a practical minimum. No credit shall be allowed
for bearing on abutting areas. Lap joints in leg members shall be preferred to butt
joints.

c) STEP BOLTS :
Step bolts shall be of 16 mm diameter and shall have round or hexagonal head. Each
step bolt shall be provided with two hexagonal nuts. The minimum bolt length and
length of unthreaded portion shall be 180 and 125 mm respectively. Step bolts shall
not be used as connection bolts.

The step bolts shall be spaced alternately on the inner gauge line on each face of the
angle about 40 cm centers. They shall be furnished for one leg of each steel structure
column from its base elevation.

d) U BOLTS:

U-Bolts shall be suitable furnished or steel structures to suspend or terminate insulator

strings or ground wire assemblies. Size of U- bolt shall withstand all loads acting on
it.

WBSETCL Page - 34/88 Sub-station Civil Tech. Specs

 e) ANCHOR- BOLTS :
Anchor bolts of equipment structures shall preferably be of same diameter for
respective voltage classes.

f) BILL OF MATERIAL:

Bill of material shall give the mark no , size, length and weight of each member and
the total weights of steel structures. It shall also include the number of bolts, nuts and
washers per structure.

10.11.05 QUALITY CONTROL:

The contractor shall establish and maintain quality control procedures for different items
of work and materials to ensure that all work is performed in accordance with the
specifications and best modern practice.
In addition to the Contractor's quality control procedures, materials and workmanship at
all times shall be subjected to inspection by the Engineer. As far as possible all inspection
by the Engineer or Engineer's representative shall be made at the Contractor's fabrication
shop whether located at site or elsewhere. The contractor shall cooperate with the
Engineer in permitting access for inspection to all places where work is being done and in
providing free of cost of all necessary help in respect of tools and plants, instrument,
labour and material required to carry out the inspection. Materials or workmanship not in
reasonable conformance with the provisions of these specifications may be rejected at any
time during the progress of the work.

The quality control procedure shall cover but not be limited to the following items of
work:

i) Steel : Quality, manufacturer's test certificates, test reports including

procurement in-voice of representative samples of materials from
unidentified stocks if permitted to be used.

ii) Bolts, nuts & : Manufacturer's certificate, dimension check, material. testing
Washers

iii) Electrodes : Manufacturer's certificate, thickness and quality of flux coating.

iv) Welds : Inspection, X-ray, ultrasonic test, magnetic particle tests as required

v) Paints : Manufacturer's certificate, physical inspection reports.

vi) Galvanizing : Tests in accordance with IS: 2633 - Method of testing uniformity
of coating on zinc coated articles and IS: 2629 Recommended
practice for hot-dip galvanizing of iron and steel. Raw zinc &
samples collected from bath shall be tested at third party laboratory
approved by WBSETCL & as per direction of the Engineer.

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 The contractor shall submit a detailed material inspection plan on the basis of various IS
codes & standard practices in respect of structural fabrication, galvanization, bolts, nuts,
anchor bolts etc much prior to commencement of the job.

10.12 FABRICATION:

10.12.01 WORKMANSHIP:
All workmanship shall be equal to the best practice in modern structural shop and shall
conform to the provisions of IS:800 / IS:802.

Rolled materials before being laid off or worked, must be clean free from sharp kinks,
bends, or twists and straight within the tolerances allowed by IS: 1852. If straightening is
necessary it may be done by mechanical means or by the application of a limited amount
of localised heat not exceeding 600oC.
Cutting shall be effected by shearing, cropping or sawing. Use of mechanically controlled
Gas Cutting Torch may be permitted for mild steel provided special care is taken to leave
sufficient metal to be removed by machining, so that all metal that has been hardened by
flame is removed. To determine the effective size of members cut by gas, 3 mm shall be
deducted from each cut edge.

The erection clearance for cleated ends of members connecting steel to steel shall
preferably be not greater than 2 mm at each end. The erection clearance at ends of beams
without cleats shall not be more than 3 mm at each end, but where for practical reasons
greater clearance is necessary, suitably designed clearance shall be provided.
All members shall consist of rolled steel sections.

Holes for bolts shall not be more than 1.5 mm larger than the diameter of the bolt passing
through them unless otherwise stated.

All members shall be cut to jig and all holes shall be punched and drilled to jig. All parts
shall be carefully cut and holes accurately located after the members are assembled and
tightly clamped or bolted together.

Drifting or rimming of holes shall not be allowed. Holes for bolts shall not be formed by
gas cutting process.

Punching of holes will not be permitted for M.S. members upto 8 mm thick and in no
case shall a hole be punched where the thickness of the material exceed the diameter of
the punched hole.

Minimum bolt spacing and distances from edges of members shall in accordance with the
provisions in the relevant Indian Standard Specification.

Built members shall, when finished, be true and free from all kinds of twists and open
joints and the material shall not be defective or strained in anyway.

All bolts shall be galvanized including the threaded portion except the foundation bolts
for which galvanizing work shall be done for a length of 100mm (min) to 175mm (max)
measured from the tip of the treaded portion. The threads of all bolts shall be cleared of

WBSETCL Page - 36/88 Sub-station Civil Tech. Specs

 smelter by spinning or brushing. A die shall not be used for cleaning the threads unless
specially approved by the Engineer. All nuts shall be galvanized with the exception of the
threads which shall be oiled. In case of foundation bolts the same shall be galvanised
excepting the length of embedment.

When in position all bolts shall project through the corresponding nuts but not exceeding
10 mm. The nuts of all bolts attaching insulator sets and earth conductor clamps to the
structure shall be carefully positioned as directed by the Engineer.

Bolts and nuts shall be placed in such a way so that they are accessible by means of an
ordinary spanner.

Foundation bolts shall be fitted with washer plates or anchor angles and flats, nuts etc.
and shall be manufactured from mild or special steel.

Washers shall be tapered or otherwise suitably shaped, where necessary to give the heads
and nuts of bolts a satisfactory bearing. The threaded portion of each bolt shall project out
through the nut at least by 3 mm. In all cases the bolt shall be provided with a washer of
sufficient thickness under the nut. In addition to the normal washer, one spring washer or
lock nut shall be provided for each bolt for connections subjected to vibrating forces or
otherwise as may be specified in the drawings.

The thickness of spring washer shall be 3.5 mm for bolt diameter 16 mm and 4 mm for
bolt diameter 20 mm.

10.12.02 CLEANING & GALVANIZING:

CLEANING :

After fabrication has been completed and accepted, all materials shall be cleared off rust,
loose scale, dirt, oil grease and other foreign substances.

GALVANIZING :

All materials shall be hot-dip galvanized after fabrication and cleaning. Retapping of nuts
after galvanizing is not permitted.

Galvanizing for structural mild steel products shall meet the requirements of IS:4759. All
holes in materials shall be free of excess spelter after galvanizing.

Galvanizing for fasteners shall meet the requirements of IS:1367. The spring washers
shall be electro galvanized as per IS:1573.

Finished materials shall be dipped into the solution of dichromate after galvanizing for
white rust protection during transportation.

All galvanizing shall be uniform and of standard quality. Quantity of zinc shall meet the
requirement of IS:209.

Mass of Zinc Coating :

WBSETCL Page - 37/88 Sub-station Civil Tech. Specs

 The mass of zinc coating for different class of materials, as given in Table below, shall be
followed :

MASS OF ZINC COATING

Electro
Minimum Value of
meter
Sl. No. Product Average Mass of
reading
Coating
( micron )
i) Casting - gray iron, malleable iron 610 (g/m2)
ii) Fabricated steel articles :
a) 5 mm thick and over 86 610
b) Under 5 mm, but not less than 2 mm 65 460
c) Under 2 mm, but not less than 1.2mm 48 340
Threaded work other than tubes and
iii)
tube fittings :
a) 10 mm dia and over 43 300
b) Under 10 mm dia 39 270

STRAIGHTENING AFTER GALVANIZING:

All plates and shapes which have been warped by the galvanizing process shall be
straightened by being rerolled or pressed. The materials shall not be hammered or
otherwise straightened in a manner that will injure the protective coating. If, in the
opinion of Employer / Engineer the material has been forcibly bent or warped in the
process of galvanizing of fabrication, such defects shall be cause for rejection.

REPAIR OF GALVANIZING:

Materials on which galvanizing has been damaged shall be acid stripped and
regalvanized, unless, in the opinion of Engineer, the damage is local and can be repaired
by zinc spraying or by applying a coating of galvanizing repair compound. Where
regalvanizing is required, any members which become damaged after having been dipped
twice shall be rejected.

10.12.03 SHOP ASSEMBLY :

One of each type of steel structures shall be assembled in the shop to such an extent as to
ensure proper field erection in order to facilitate inspection by the Engineer.
10.12.04 SHOP TEST :

The following shop tests shall be performed with relevant provisions of I.S.Codes :
a) General Inspection
b) Material test.
c) Assembly test.
d) Galvanizing test.
The contractor shall furnish four certified copies of reports of all tests to the Engineer.

10.13 FOUNDATION WORKS :

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 GENERAL REQUIREMENT:
The design of RCC foundation for all the Sub-station steel structures, electro-mechanical
equipments, control and residential buildings etc. to be constructed shall be the
responsibility of the contractor. All design of RCC foundation works shall conform to
IS:456 (2000) unless otherwise mentioned herein. All designs and details shall be subject
to approval of the Engineer. Effect of additional surcharge due to earth filling shall duly
be taken into account during design.
However, detailed foundation design shall be based on the actual soil parameters which
shall be ascertained by the intending bidder. Any variation in design of foundations due
to change in soil parameters during execution of work shall not affect the terms of the
Contract. No extra payment on account of any change whatsoever in soil parameters will
be entertained.

10.13.01 DESIGN OF FOUNDATIONS :

A) STEEL STRUCTURE FOUNDATIONS :
The foundations shall be designed such that the upper structure shall be securely
supported. Any unequal displacement that may cause harmful effect to the upper
structures shall not be allowed. The safety factors for strength and stability of the
foundations shall be as per relevant code.
The overload factor shall be taken as 1.1 for designing foundations of all gantry and
equipment The loads, shear and moment values shall be multiplied with this overload
factor, so as to obtain the design values.

B) ELECTRO-MECHANICAL EQUIPMENT FOUNDATIONS :

The foundation shall be so designed that the upper equipment shall be securely supported.
The effect of vibration of the equipment, impact load when in operation and overturning
force due to abnormal condition of equipment shall be considered in foundation design.
The safety factor for stability of the foundations shall be as per relevant code with an
overload factor of 1.1.
R.C.C. foundations of 400/220 KV, 315 MVA& 220/132KV, 160 MVA transformers /
reactor shall be designed. Design loads are to be considered from the manufacturers
specification & approved GA drawing of the respective transformer / reactor.
R.C.C. foundations of 132/33 KV, 31.5 MVA transformers & below shall be designed
and constructed in such a way so that same can be utilized for installation of 50 MVA
transformers in future. Few minimum design parameters for 50 MVA, 132/33 KV
transformers are provided below for guidance:
a) Transformer Plan size = 8500x8000 mm
b) Weight of Transformer including oil = 95 MT
c) Rail Gauge = 1676 mm
d) Total Oil Capacity = 26000 liter
e) Eccentricity in all two directions = 50 mm
The oil soak pit and oil/water sump shall also be designed and constructed for the above
transformers / reactor as per requirement.
Following minimum values shall be used while designing foundations:

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 i) Minimum base slab thickness of footings : 200 mm
ii) Minimum main bar dia for foundation : 10 mm TOR

iii) Minimum bar dia for columns : 12 mm TOR with binder

spacing limited to 190 mm c/c.

iv) Clear cover to : Main bars in base slab : 50 mm

Main bars in columns : 40 mm
Main bars of beams : 25 mm

v) Minimum reinforcement for base slab shall be 0.2 percent of cross sectional area,
depth to be considered as effective depth and where beam slab mechanism will be
deployed 0.12 percent of gross cross sectional area shall be considered.

350 mm
b) 220 kV 300 mm
c) 132 kV & 33 kV 250 mm

C) THE LOADS, MOMENTS AND SHEAR FOR FOUNDATION; SUMMARY OF LOADS,

MOMENTS AND SHEAR AT CONCRETE LEVEL OF VARIOUS STRUCTURES &
EQUIPMENT STRUCTURES

Sl. Structure Vertical Moment Horizontal Shear

No. loads Along bay Across bay Along bay Across bay
(Kg) (Kg-M) (Kg)
1 2 3 4 5 6

33 KV
1. LINE TOWER 1966 36013 5925 5100 1183
2. A-Frame(Main Bus 2163 49475 3233 9352 915
With Twin Moose)
3. A-Frame(Transfer Bus 1920 25795 2810 5040 800
With Single Moose
4. H.L.Isolator 3458 50694 4373 9666 1203
5. Isolator(3-Ph) 1050 3000 1250
6. Isolator(1-Ph) 355 1071 640
7. B.P.I(3-Ph) 690 2056 1091
8. B.P.I.(1-Ph) 175 720 325
9. P.T.(3-Ph) 906 2584 1278
10. P.T.(1-Ph) 512 829 458
11. H.C.T(3-Ph) 470 2628 1257
12. L.C.T.(3-Ph) 440 1869 1065
13. L.A(3-Ph) 615 2196 1062
14. NCT 237 852 354
15. REACTOR 331 1356 503
16. CAPACITOR BANK 2920 5068 3313 1448 1105
17. BREAKER
18. TRANSFORMER

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132 KV :
1. LINE TOWER 3800 115360 39350 8990 3800
2. 2900 83525 12930 10425 2040
with Twin (Moose)
3. 2415 46820 11615 6150 1880
Bus with Single
Moose)
4. H.L.Isolator 3715 87245 18636 11010 2803
5. L.L.Isolator 1700 5400 - 2330 -
6.i) B.P.I. 425 2300 - 600
ii) B.P.I.(H/L) - 530 3100 840
7. P.T. 748 3025 - 886 -
8. High level CT 1115 3806 - 1036 -
9. Low level CT 1035 2875 - 880 -
10. L.A. 510 1230 - 465 -
11. CVT 811 1256 - 582 -
12. Isolator(1-Ph) 500 3080 - 1170 -
13. Lightning Mast 4900 62000 62000 4100 4100
14. C.S.E 460 2650 - 710 -
15. Breaker
16. Transformer

220 KV :

Horizontal Shear Moment

Sl Longitudinal Transverse Longitudinal Transverse
Type Verti
. Directions Direction Moment Moment
of cal
N Longitu Transv Longitu Transv Longitu Transv Longitu Transv
Tower Load
o. dinal erse dinal erse dinal erse dinal erse
Wind Wind Wind Wind Wind Wind Wind Wind
2T1/2
1 8973 11268 6132 4200 9092 166230 108032 44940 96452
T1A
2T2/2
2 7134 9334 5166 259 3886 137000 88036 5362 43524
T2A
3 2C1 6000 11836 8400 0 2838 117758 89880 0 20486
4 2C2 3350 6450 4200 0 2000 62746 45900 0 13404
5 2C3 2620 4058 2100 0 1618 37800 23262 0 10642
220 KV :

Sl. Structure Vertical Moment Horizontal Shear

No. loads Along bay Across bay Along bay Across bay
(Kg) (Kg-M) (Kg)

1. Wave Trap 700 1513 - 518 -

2. i)H.C.B.Isolator(1-ph) 1900 6200 - 1570 -
ii)Tandem Iso.(1-ph) 1760 5000 - 1500 -
iii)Panto Iso.(1-ph) 980 3000 - 640 -
3i) Bus Support 430 3720 - 884 -

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 ii) Bus Support(H/L) 650 5580 1350
4. Circuit Breaker
5. C. T. 2000 5352 - 1319 -
6. P.T. 1240 3786 - 915 -
7. L. A. 700 4500 - 1300 -
8. C.C/C.V.T. 900 1785 - 650 -
9. C.S.E 475 4300 - 1025 -
10. 220/132KV Transformer SIESMIC

400 KV :
Vertical Load Horizontal Shear (KG) Moment (KG-M)
Sl (KG) Longitudinal Transverse Longitudinal Transverse
Type
. Direction Direction Direction Direction
of
N Longit Transv Longitu Transv Longit Transv Longitu Transve Longitu Transv
Tower
o. udinal erse dinal erse udinal erse dinal rse dinal erse
Wind Wind Wind Wind Wind Wind Wind Wind Wind Wind
4T1/
1 12598 12598 28442 18160 4866 12582 595219 423090 113370 228409
4T1A
4T2/
2 15970 15970 29531 18160 13266 23248 609848 423090 239370 386693
4T2A
3 4T3 6372 6372 13252 8400 0 3675 177033 126000 0 33378
4 4T4 10044 10044 23978 16800 0 4824 336093 252000 0 48782
5 4T5 6217 6217 9229 4200 0 3465 116688 63000 0 30228
LM
6 6700 6700 7500 ------- -------- 7500 155000 --------- -------- 155000

400 KV :

Sl. Structure Vertical Moment Horizontal Shear

No. loads Along bay Across bay Along bay Across bay
(Kg) (Kg-M) (Kg)
1. Wave Trap 1100 3870 - 800 -
2. i)H.C.B.Isolator(1-ph) 2700 7600 - 1780 -
ii)Panto Iso.(1-ph) 1575 7900 - 1350 -
3. Bus Support 825 5150 - 1015 -
4. Circuit Breaker
5. C. T. 2235 7800 - 1530 -
6. P.T. 1470 4450 - 1160 -
7. L. A. 1030 6650 - 1450 -
8. C.C/C.V.T. 1360 3565 - 950 -
9. 400KV Transformer / Reactor

Note : 1. Uplift/down thrust due to moment shall be computed with the base dimensions shown
in Bid drawing.
2. Columns in foundation shall be checked in compression with bending and uplift with
bending also.
3. Above loads & moments etc. shall be multiplied by an overload Factor of 1.1 while
computing design values.
4. Foundations for single phase structures shall be designed in both directions i.e. along
bay and across bay with loads shown in the aforesaid table.

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Any doubt in regards to design loads, moments etc. and about its applicability to any particular
structure shall be limited to tendering authority prior to submission of bid. No claim whatsoever on
this account will be entertained during execution of work.

10.13.02 DETAILS:

A) DETAIL DESIGN CALCULATION :

Detail design calculations for each type of foundation shall be submitted for approval of
Engineer. Such details shall show the following requirements.
i) Detailed calculation of loads acting on foundation under different loading conditions.
ii) Calculated safety factor for each type of stability and other conditions.
iii) Maximum stresses in concrete and in steel reinforcement at any critical section.

B) LINE AND GRADE:

The contractor shall set all lines and grades or elevation of the ground at all footings and
set the necessary stakes that are required for the work and will be responsible for their
accuracy. Employer/Engineer may check lines and levels set by the Contractor form time
to time, and inadequacies if any, shall be rectified by the contractor as per the direction of
the Engineer, but the responsibility for their accuracy shall rest entirely with the
Contractor.

C) DETAIL DRAWINGS :
Details of each type of foundation submitted for Employer's/ Engineer's approval shall be
as shown on the approved design drawings and shall conform to the requirements
described hereafter. No change shall be made without the written approval of
Employer/Engineer. The detail drawings shall include but not limited to the following:
i) Detail dimensions of foundation.
ii) Details of setting dimensions of foundation.
iii) Details of placing of all reinforcing steel which shall conform to the Building Code
Requirements for Reinforced Concrete (IS: 456) and the Manual of Standard Practice
for Detailing Reinforced Concrete Structure unless otherwise specified herein.
iv) Details of type size and length of each reinforcing steel including schedule of bar
bending to be submitted to the Engineer at site

.
10.13.03 BORED CAST IN SITU PILES

The scope of work comprises furnishing of all labour, materials, equipments, tools,
plants, transportations, supervision, quality control etc. for complete and proper
installation of cast in situ concrete bored piles, both vertical and battered, for foundations
and pile caps and beams as shown in the Drawings or specified including all surveying
and setting out arrangements necessary for fixing correct location of piles etc. , furnishing
everything necessary for forming working piles, test piles and anchor piles (if necessary),
excavation required for pile cut off, dismantling of concrete up to cut off level of all piles
to true elevation specified, load tests of single piles and /or group of piles and cleaning up
of the works area. For checking the quality of the pile shaft, contractor shall provide
everything necessary for examining the piles as instructed.

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 The information given in the bore logs and soil investigation report, is given in good faith
and owner will not be responsible for any discrepancy or inaccuracies therein and shall
not entertain any claim whatsoever for the contractor on this account.

Nothing contained in this contract document or these specifications shall relieve the
contractor from the responsibility of obtaining the approval from the WBSETCL for the
pile installation and testing procedure to be followed by him.

During the execution of the works should any error or ambiguity appear in any of the
contract documents the contractor shall not proceed with the work before obtaining
instructions/ clarifications from the WBSETCL.

The cast in situ bored piles shall be formed with in the ground by excavating or boring a
hole within it to specified depths as shown or called for in the drawings or as directed by
the WBSETCL at site, with or without the use of a temporary casing ( as may be required
to keep the hole stabilized) and filling the same with plain or reinforced concrete as
specified therein. The full depth of the bore hole may be lined with the approved
Bentonite suspension of adequate specific gravity may be used for the full depth as the
boring proceeds, to prevent the sides of the bore holes from collapsing.

The report on Geo-technical investigation carried out at the proposed site may be referred
to plan the piling process and other technical requirements.

10.13.03.01 EQUIPMENT AND ACCESSORIES

The equipment, plants and accessories would depend upon the type of bored cast in situ
piles chosen for a job after giving due consideration to the sub soil strata, ground water
condition, manner of operation and the required penetration therein.

Boring operation shall be done by percussion or rotary type rigs with direct mud
circulation or reverse mud circulation method to bring the cuttings out. In soft layers and
loosed sands, bailers and chisel method, if used, should used with caution to avoid the
effect of suction.

The size of the cutting tools should not be less than the diameter of the pile by more than
75 mm.

Drilling mud should be used for stabilizing the size of the bore holes where stabilizing is
not done by casing.

Standard Augur boring without proper stabilization of bore hole by drilling mud or casing
should not be used for bored piling work.

10.13.03.02 DIAMETER OF THE PILES

In general the measurement of the diameter of the pile shall be as follows:-

A. For cast in situ bored piles employing temporary casing withdrawn during the placing
of the concrete, the nominal diameter shall be the outside diameter of temporary
casing.

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 B. For cast in situ bored piles with permanent liner, the nominal diameter shall be inside
diameter of the permanent casing left in place.

For partly lined bored cast in situ piles using drilling mud of suitable consistency and the
nominal diameter shall be the inside diameter of the guide liners, (temporary or
permanent). The contractor may however be required to demonstrate to the WBSETCL,
if so called by him, that the diameter of the bore hole of its full length is not less than the
nominal diameter specified and this may be done by lowering a guide ring having a
diameter equal to the nominal diameter of the pile in to the bore hole before concreting
the pile or lowering the reinforcement cage.

10.13.03.03 CONTROL OF ALIGNMENT

Piles shall be installed as accurately as possible as per the design and drawing and a
deviation of 1.5% in alignment of vertical piles should not be exceeded.

Piles less than 600 mm in diameter should not deviate more than 75mm or D/10,
whichever is less from there designated positions at the working level. In the case of
single pile under as column the positional deviation should not be more than 75mm or
D/6, whichever is less.

10.13.03.04 MATERIALS FOR PILLING

CONCRETE (PILLING WORK)

Unless otherwise stated herein all aspects of the concrete works including materials,
specifications, preliminary mix design, workmanship and inspection testing stipulated in

Cement shall be ordinary Portland cement conforming IS 8112, IS 12269 unless specified
otherwise.

Maximum size of aggregates shall be 20mm.

Concrete, for piles cast in situ shall have sufficient slump (125 to 175mm) to give it a self
compacting consistency. The water cement ratio including the water contained in the
aggregates shall be limited to 0.55 unless otherwise stipulated. Plasticising agents may be
used by the contractor to improve the workability but the WBSETCL shall be furnished with
proof that the proposed plasticizing agent has no adverse effects on the hardened concrete or
reinforcement.

One set of test cubes (6 nos.) should be taken for each pile for testing strength of the concrete.
Three of the six cubes constituting one test shall be tested on the 7th day from casting the
cubes and the remaining three cubes shall be tested on the 28th day after casting.

The WBSETCL reserves the right to reject any pile of deficient concrete strength. Such
rejected piles shall be replaced by the contractor at his own cost who shall also bear the
additional cost of widening the pile caps resulting from the grouping of the piles as a result of
replacement of piles.

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 WBSETCL also reserves the right to order change in the mix design and/ or water cement
ratio to obtain the specified strength of workability.

REINFORCEMENT

A. All reinforcement for use in the piles shafts shall be as per drawing, dully tested from
manufacturers end successfully and be assembled and tied and / or welded together and
made up into cages sufficiently rigid to withstand handling without damage and
distortion.
B. Joints in longitudinal reinforcement bars, if unavoidable shall be made by lapping and the
laps shall be stitch-welding duly design approved by WBSETCL to prevent distortions of
the reinforcement cage.
The projection length of longitudinal bars beyond the pile cut-off level shall be equal to
40 times the diameter or such other length as shown on the drawings.
Unless otherwise specified in the drawings, the lateral reinforcement shall consist of helix
made from 8mm dia bars at a pitch of 150 mm throughout the length of the reinforcement
cage.
The minimum number of longitudinal bars shall be six (6).
Concrete cover over all reinforcement including lateral helical reinforcement shall be 50
mm, unless otherwise specified or shown on the drawings. Care shall be taken to preserve
the correct cover and alignment of reinforcement free from any twist, throughout the
whole operation of placing the reinforcement in the bore hole and placing the concrete.
The inside diameter of the reinforcement cage shall be adequate for the operation of the
Tremie pipe when used.

10.13.03.05 DRILLING MUD (BENTONITE)

Drilling mud corresponding to basic properties given under Appendix A under Clause 4.3
of IS: 2911 (Part I / Sec 2) shall be used to keep the sides of the bore holes established. Mud
shall have THIXOTROPHIC properties i.e. gel forming property. The drilling mud shall have
such properties as to permit the formation of Filter cake on the sides of the bore holes, the
thickness of which would depend on the nature of the subsoil deposit. Sodium based
Bentonite have ideal properties for use as drilling mud.
Fresh Sodium based Bentonite shall have :
The liquid limit more than 300 percent when tested in accordance with IS: 2720 (Part V) and
less than 450 percent. The PH of 5% suspended between 8 & 11.5 the free water standing
after 24 hours of 10% suspended of 100 cc be only a thin veil of water. Sand content of
Bentonite powder to be not more than 7%. The marsh viscosity of 5% suspension to be
around 30 to 35 sec. The 10 minute gel strength of fresh 5% bentonite to be between 10 to 75
kg/sq.m. The specific gravity of the suspension not to be less than 1.12.
During the boring operations the fresh suspension gets contaminated with bored spoil and
gradually becomes heavy. This contaminated bentonite may be reused depending upon the
manner of boring, type of strata encountered and the specific gravity of the contaminated
bentonite. It is essential to check the specific gravity of the bentonite in the bore hole before
concreting. The contaminated bentonite may be collected in a suitable receptacle and allow
the heavier particles to settle and the slurry washed before reuse.
The drilling muds shall be suitably disposed off without causing any nuisance to the
surrounding area in a manner approved by the WBSETCL.

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 10.13.03.06 BORING OPERATIONS

BORING FOR UNLINED BORE HOLES

Boring may be done by direct mud circulation, reverse mud circulation or by bailer using
drilling mud to stabilize the bore hole from collapsing.
A protective steel casing of suitable length both above the ground and below it shall be
installed for protection of personnel and to prevent cavities and displacement of the earth and
for retention of the surface water.
In direct mud circulation method entire hole should then be kept full with fluid which should
be kept in motion. The density and the composition of the fluid should be such as to suit the
requirements of ground conditions and to maintain the fine materials from the borings in
suspension.
The bottom of the bore holes shall be cleaned of all the spoils and sediments before placing
of concrete.
Consistency of the drilling mud suspension shall be controlled throughout the boring as well
as concreting operation in order to keep the hole stabilized as well as to avoid concrete
getting mixed up with the thicker suspension of mud.

10.13.03.07 CONCRETING

Concreting of boreholes shall start as quick as possible after its completion. Should a bore
hole be left un-concreted for more than two hours, it shall again be cleaned thoroughly before
placing of concrete. The concrete shall be freshly mixed and poured in sufficient quantities in
the casing so that during the withdrawal, a sufficient head of concrete is maintained to
prevent the inflow of soil and subsoil water.

The entire depth of the pile shall be concreted in one operation without stoppage.

All concreting operation for piles shall be carried out during day time only.

Exposed portions of piles shall be cured for at least 10 days from the date of casting.

When installing the piles in groups, sufficient time shall be allowed for freshly poured
concrete in pile to set before installing adjacent piles. The WBSETCL in consultation with
the contractor shall determine the installation sequence and time schedule to ensure that
freshly concreted piles in a group with in 0.5 m of each other however not be constructed
before a lapse of 2 days after the installation of the pervious pile.

All care shall be taken to prevent formation of voids in the piles by pockets of air trapped
within. Particular attention shall be paid to this during the withdrawal of casing. The volume
of concrete placed in the pile shall be checked with the theoretical volume of the pile, and any
shortfall in the actual volume concreted shall be reported to the WBSETCL.

After the boring has been flushed and approved and with the reinforcement in place, the pile
shaft shall be concreted by the Tremie pipe. It should however be ensured that concrete
entering the tremie pipe shall not get mixed up with the slurry, as described above for lined
bored piles. Before concreting the bore shall be flushed once again with bentonite slurry
through the tremie pipe to ensure that the bottom is cleaned after placing the reinforcement.
The tremie pipe shall always be maintained a minimum 2 to 2.5 m inside the concrete.

WBSETCL Page - 47/88 Sub-station Civil Tech. Specs

 10.13.03.08 TESTING OF PILES

Location of Load test on working piles will be decided by WBSETCL.

1.5% of the total number or minimum two piles shall be subjected to non-destructive load
tests to 1.50 times the design load (i.e. estimated safe carrying capacity of pile).
In case 1.5% of the total number of piles exceeds 2 (two), number of pile to be tested shall be
rounded up to next higher whole number, if it is a fraction.
The test shall be carried out by applying a series of load on a pile unaided by other support.
The load shall preferably be applied by means of hydraulic jack, of adequate capacity and
shall have pressure gauge and a remote control pump, reacting against a loaded platform,
which shall be preloaded to not less than 2 ½ times the estimated safe load bearing capacity
of the pile. WBSETCL shall demand to get the test certificate regarding the calibration of the
gauge at the cost of the contractor.

Before any load test to be performed the proposed setup and the load frames shall be got
approved from WBSETCL.
Settlement shall be recorded with minimum 2 (two) dial gauges for single pile and 4 (four)
dial gauges of 0.01 mm sensitive for groups each positioned at equal distance around the piles
and normally held by datum bars resting on immovable supports at a distance of 3D (subject
to minimum of 1.5 m) from edge of the pile.

The test load shall be applied in equal increments of one fifth of the estimated safe load or
as directed by WBSETCL. Alternate loading and unloading at each load increment shall be
performed and the elastic and plastic settlements recorded.

Each stage of loading or unloading shall be maintained till the rate of movement of the pile
top is not more than 0.02 mm per hour.

The contractor shall supply to the WBSETCL with a record in writing of all observations
made during the load test together with the graphically representative curves as mentioned in
clause 9.1 &9.2 of IS: 2911 (Part IV).
Acceptance criteria
Piles shall satisfy the following requirements:-
i) The total settlement for the test load shall not exceed 12 mm.
ii) The net (residual) settlement after the test load is removed shall not exceed 6
mm.
iii) The general behavior of the pile during the test shall be proper.

The pile which fails to satisfy the above requirements shall be rejected and another pile tested
in lieu. The rejected pile shall be replaced or rectified with prior approval of WBSETCL at

If second pile tested also fails, the rejection of part or the entire lot and rectification measures

Voids resulting from rejected borings or extraction of the piles or casings shall be filled with
gravel or sand unless other piles are installed in such voids at the cost of Contractor.

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 10.13.03.09 GENERAL

Pumping and bailing out of water, shoring, strutting etc. if required shall be done by the
contractor at his own cost.
All piles shall be concreted to a level 150mm to 450 mm above the specified pile cut off
elevation which shall be 7.5 cm above the bottom of the pile cap. For piles cast by tremie
method, in bentonite established bore holes, this level of concreting above pile cut off level
shall be not less than 600 mm.

Before casting the pile cap, this excess concrete shall be cut off up to pile cut off elevation. In
case sound concrete is not met with at such elevation the piles shall be cut of such elevation
where sound concrete is met.

A minimum length of 2 mtrs of temporary casing shall be provided for each bored piles
unless otherwise specifically desired. Additional length of temporary casing shall be used
depending on the condition of the strata, ground water level etc.

Daily site records shall be maintained by the Contractors for the installation of piles against
each Rig. All the necessary data shall be recorded for checking as and when required. One
copy of data sheet shall be retained by the contractor and other copy shall be submitted to
WBSETCL for records.

10.14 CONTROL BUILDING:

GENERAL:

The contractor shall provide control building and furnish the indoor facilities in accordance
with the requirements specified herein and in the accompanied bid drawings.

Where the control building is to be constructed as an extension of the existing control

building, the same shall be placed by the side of the existing control room and shall be
connected by dismantling the common existing brick wall of the existing Control room,
without endangering the safety of the structures. The Contractor shall ensure smooth
functioning of day to day work during execution of the extension job.

The control room will be having adequate area and will accommodate all control panels along
with specified numbers of future control & relay panels as per approved layout, D.C. & A.C.
Distribution boards and battery charger panel etc. Apart from control room the battery room,
PLCC room, Conference room, stair and toilet block etc. shall be provided as per approved
layout drawing and requirement.

Control panels & equipments shall be laid in control room keeping adequate clearance &
sufficient space for movement & maintenance. Minimum clearance from wall at the back of
panel will be 1200mm. Clearance between two adjacent panels will be decided during
detailed engineering.

The planning of control building shall be made in such a way that the entire switchyard is
made clearly visible from the control room for better supervision and control.

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 The contractor shall furnish detailed conceptual drawings showing floor plans, front, rear and
side elevations accommodating all panels, equipments and other required spaces.

The indicative drawing as attached in these documents is outline plan for bidding only. The
contractor shall, on the basis of drawing and specification made part of the document, prepare
design drawings including all facilities in accordance with relevant IS codes and National
Building codes and submit to Employer / Engineer for approval.

Generally, live loads shall be considered in accordance with IS: 875. The design live load for
floor, stairs and balconies of control building shall be as per cl. No.10.11.02 (Live load).

The control room, conference room and PLCC room, as per requirement shall be air
conditioned by installing suitable air conditioners. Exhaust fans of approved capacity shall be
installed in battery room and toilets of control building and kitchens of residential quarters.

Internal walls & Ceiling shall be of two coats of Plastic Emulsion paint over one coat of
cement primer on plastered surface with 1.5mm thick white cement based wall putty of
approved make and brand. On external surfaces, approved make and thickness ACP panels to
be used. Tinted glass glazing with proper fixing arrangement shall be used for good
architectural view.
Floor finish shall be as follows:
a) Vitrified tiles flooring for all rooms including stair case and Corridor, control room, PLCC
and conference room except battery room, store.
b) Artificial stone flooring with 150mm high skirting consisting of 25mm thick
concrete(1:2:4) with 6mm thick cement punning for Store Room only.
c) 150x150 acid and alkali proof tiles 20mm in floor and 20mm in dado with1500mm high in
battery room only for use of Plante Battery.
OR
Vitrified tiles flooring with 150 mm dado in battery room for use of VRLA battery.
d) 150mmx150mmx 5mm thick coloured Ceramic (Anti skid) tiles with 1500mm high dado
for toilet.
For further details of Finish in Control Bldg. refer Cl.no 10.14.05,06 &08.);
Generally 1000mm wide Plinth protection work with 75mm thick P.C.C (1:3:6) over single
brick flat soling finished with Neat cement with peripheral drain to be provided around the
Control Building.
Overhead P.V.C.(P4 internation or equivalent) water tank of 2 nos each having 1500 litres
capacity shall be provided for Control Room Building.

The work will also include sanitary, plumbing, Cable trench, Cable hangers, partition walls,
false ceiling, flooring, Aluminum stair railing, wall/ceiling finishing work, painting job,
plinth protection, surface drain, septic tank, soak pit, illumination, internal electrification,
A.C. & ventilation work and all other architectural and civil item of works required for
completion and successful commissioning of the control building on turn-key basis.

For Remodeling of Existing Control Building for Extension the following

shall be taken care of:

01. Exterior portion should match the architectural façade of existing one as far as
practicable.
02. Exterior portion will be given the same coat of cement based paint of same shade.

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 03. Interior walls & ceilings should be given the same treatment as that of extended portion.
04. Floor of extended portion of Control Room should match with the existing one.
05. Existing Control building shall be connected with the extended portion by dismantling
walls, windows, chajjas or doors of existing part as required.
06. No load of the extension portion shall be put on the existing building but will be
supported on independent structures.
07. The false ceiling should be provided in the existing one as that to be provided in
extended portion of control room, PLCC room & conference room as per requirement.
08. Electrical wiring in existing portion shall also be done as that of extended portion as
applicable.
09. Roof treatment work shall be done for the existing portion also as that to be done in
extended part as per specification.
10. Doors, Windows & Grills of the existing portion shall be repaired & replaced by new
one as per requirement.
11. Junction between existing & new portion of the building shall be sealed properly.

10.14A INTEGRATED BUILDING :

GENERAL :
Integrated Building shall normally consist of GIS Hall, 33 KV Switch gear Hall with cable
spreader rooms, Control room & office etc.
The bidder shall submit the design and construction proposal of the building , in line with
the above & tender drawing, along with necessary information, data & drawings in
Techno-Commercial Bid (under Envelop-I) according to the complete requirements.
The contractor shall furnish detailed drawings showing floor plans, front, rear and side
elevations accommodating all panels, equipments and other required spaces during detail
engineering and prepare design drawings including all facilities in accordance with relevant IS
codes and National Building codes and submit to Employer / Engineer for approval.

The building shall be of R.C.C (Reinforced Cement Concrete) framed structure with filled
brick walls (250 mm thick). For supports of the Crane Rail in GIS room provision shall be kept,
in R.C.C. columns of the building, by the contractor.
The column shall be designed for most critical conditions of dead loads, imposed loads,
equipment loads, crane load, wind load, seismic load and temperature loads. In addition, loads
and forces developed due to differential settlement shall also be considered
Suitable expansion joints shall be provided in the longitudinal direction wherever necessary
with provision of twin columns.
The walls infilling masonry shall comprise of plastered masonry on both side with a adequate
horizontal stiffening reinforced concrete beam according to the overall static requirements.
All plastered areas, concrete elements and ceiling shall be painted twice, internal surfaces with
plastic emulsion paint & external surfaces with protective & decorative textured exterior high
class mat finish, composed of special thermoplastic resin containing fine crystalline additives
drived from granite ( weather coat etc. ) paint.
A coat of approved primer shall be used before applying paints.
Floors of toilets shall be finished with colour decorative first quality Ceramic tiles (Anti skid)
with suitable border. All other floors including Stair, Corridor etc shall be finished with
vitrified tile flooring excepting GIS & 33 KV switch gear room which shall have a highly
smooth, dust free and abrasion proof surface finish. The floor finish shall withstand without

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 any damage due to the loads caused by heavy equipments and to be finished with IPS with
metallic hardener(50mm thick cement concrete flooring with cement hardener topping under
layer 38mm thick cement concrete 1:2:4(1 Cement:2 Coarse Sand: 4 Graded stone aggregate
20mm nominal size),and top layer 12mm thick cement hardener consisting of mix 1:2 (1
Cement hardener mix : 2 graded stone aggregate 6mm nominal size) by volume, hardening
compound mixed @ 2 litres per 50kg of cement or as per manufacturers specification.). The top
surface to be finished with epoxy paint of approved colour.
Floor of battery room shall be done with acid and alkali resistant tiles for use of Plante Battery.
OR
Vitrified tiles flooring in battery room for use of VRLA battery.

Cable Spreader Rooms shall be finished with Artificial stone flooring with 150mm high
skirting consisting of 25mm thick concrete(1:2:4) with 6mm thick cement punning for Store
Room only.
Common finishing items in AIS Control building and Integrated building shall have same
specification as detailed above.
Decorative Paver Blocks to be used at the exposed portions of Ground Floor and wherever
necessary as per direction of Engineer in charge for finishing of surface.
For further details of Finish in Integrated Bldg. refer Cl. no 10.14.05,06 &08.
1000 mm (minimum) wide Plinth protection shall be finished with 25mm thick chequered tiles
over 75mm thick P.C.C (1:3:6) & single brick flat soling.
The requirements for heat transitions shall be designed keeping in mind the atmospheric
conditions.
The approximate dimensions of the rooms of the Integrated building are given in the tender
drawing. Height of the floors shall be as per the specification of the manufacturer of the GIS
equipments. The dimensions given in Tender Drawing are for reference only and may vary
according to the requirements of the equipments to be installed inside. The bidder shall finalize
the dimensions according to the requirements to the equipment offered by them providing
enough space & access for erection, operation and maintenance. Provision for cable trench
shall be kept at ground floor as per requirement.
The building shall be equipped with an Electrically Operated Overhead Travelling Crane
including a crane Runway with Hook at a suitable height from top of the finished floor as per
requirement. Sufficient head clearance above the crane top level to the bottom of the Roof
beam shall be provided.
The capacity of the crane shall be adequate enough for loading & unloading the GIS
equipment.
Access gates with metal shutter and access doors shall be provided in the building. Those
entrances shall be designed to keep out rain water.
The height and width of the access gate shall be so designed to enter the trailer loaded with the
switchgear components in the building and to lift up the components by EOT crane.
The building shall be designed to secure sufficient positive ventilation to keep it dust free to
prevent humidity.
Exhaust measures like smoke vents for the whole interior shall be provided.
The control room will be having adequate area and will accommodate all control panels along
with specified numbers of future control & relay panels as per approved layout. Apart from

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 control room the battery room, PLCC room, ACDB room (for 220 KV), stair and toilet block
etc. shall be provided as per approved layout drawing and requirement.

Control panels & equipments shall be laid in control room keeping adequate clearance &
sufficient space for movement & maintenance. Minimum clearance from wall at the back of
panel will be 1200mm. Clearance between two adjacent panels will be decided during detailed
engineering.

The planning of Integrated building shall be made in such a way that the entire switchyard is
made clearly visible from the control room for better supervision and control.

Generally, live loads shall be considered in accordance with IS:875. The design live load shall
be as per cl. No.10.11.02 (Live load).

The control room, conference room and PLCC room as per requirement shall be air conditioned
by installing suitable air conditioners. Exhaust fans of approved capacity shall be installed in
battery room, cable spreader rooms and toilets of control building and integrated building.

The work will also include sanitary, plumbing, Cable trench, Cable hangers, partition walls,
false ceiling, flooring, Stainless Steel stair railing, wall/ceiling finishing work, painting job,
plinth protection, surface drain, septic tank, soak pit, illumination, internal electrification, A.C.
& ventilation work and all other architectural and civil item of works required for completion
and successful commissioning of the Integrated building on turn-key basis.

Overhead P.V.C. water tank (P4 international or equivalent) of 2 nos each having 1000 litres
capacity shall be provided for Integrated Building.

10.14. B GIS BUILDING (SINGLE STORIED PRE ENGINEERED BUILDING)

The GIS building shall be of pre-engineered steel structure with the provision of pressurized
ventilation. GIS building consists of GIS Hall, unloading platform and separate AHU room
etc. A corridor having minimum width of 1500 mm shall be provided all around GIS to
facilitate maintenance of equipments. Material specification and other details for construction
of Pre-engineered steel building shall be as described in subsequent paragraphs.

The base plate of steel columns shall be mounted on the RCC foundation by means of
foundation bolts. In order to facilitate inspection and maintenance, the structures shall be
provided with climbing devices. The built up frame shall be applied with a priming coat of red
oxide zinc chromate primmer before taken out of workshop. Separate fire escape door is to be
provided in the GIS Hall.

Walkway of width not less than 1.0m shall be provided at gantry girder level on the two longer
side of GIS hall along with climbing arrangement to facilitate maintenance of crane. All steel
work shall be painted with one coat of steel primer and two coats of synthetic enamel paint
after erection.

All the material required for Pre-engineered (steel) building shall be procured from TATA
Blue Scope/ Era buildsys/ Vardhman/ Kirby building Systems/ Zamil Steels/ Phoenix
Construction Technologies/ Interarch Building Products/ Aster Building Solutions Pvt. Ltd. or
any other reputed manufacturer (approved by PGCIL & and should have credentials of
supplying PEB either to PGCIL or to other State Power utilities of India) for which prior

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 approval is to be obtained. Manufacturing of various parts of the building shall start only after

Manufacturer and certified by the Contractor for its correctness is to be submitted to

WBSETCL. Approval of BOM and shop drawing from employer is not required.

Material Specification

Primary members fabricated from plates and sections with minimum yield strength of
345Mpa or to suit design by continuous welding.
Secondary members for Purlins and Grits shall conform to the physical specification of
ASTM A570 (Grade 50) or equivalent IS Standards having a minimum yield strength of
345MPa. The minimum thickness of secondary members shall not be less than 2.5mm.
Rod / ANGLE bracing shall conform to the physical specification IS 2062 of minimum
245Mpa Yield Strength
All hot rolled sections shall conform to the physical specifications IS 2062. All other
miscellaneous secondary members shall have minimum yield strength of 250MPa.
DESCRIPTION
PRIMARY MEMBERS:
Primary structural framing shall include the transverse rigid frames, columns, corner
columns, end wall wind columns and crane gantry girders and Frames at Rolling shutters &
Door openings.
SECONDARY MEMBERS:
Secondary structural framing shall include the purlins, girts, eave struts, wind bracing, flange
bracing, base angles, clips, flashings and other miscellaneous structural parts. Suitable wind
bracings sag rods to be reckoned while designing the structure.
PURLINS:
Purlins should be of Pre Galvanised steel of 345Mpa having a coating thickness of 275 gsm.
ROOF SHEETING
50mm thick puff (density 40kg/cu.m.) sandwiched panels shall be provided. These panels
shall be made of puff insulation sandwiched between two number SMP coated galvalume
steel sheets. These sheets shall be made out of 0.5mm thick high tensile steel having min.
yield strength of 345 Mpa conforming to ASTM- A446. Galvalume sheets shall conform to
AZ 150 of AS 1397 or ASTM 792 with hot dip metallic coating of 55% Al and 45% Zn alloy
having total coating mass of minimum 150gms/sq.m inclusive of both sides. Total coat
thickness (TCT) of sheets shall be minimum 0.55mm with base metal thickness.
Wall Panels
Wall panel material specifications shall be same as roof panels.

SHEETING FASTENERS:
Standard fasteners shall be self tapping zinc plated metal screws with EPDM bonded zinc
plated washers. All screws shall be colour coated to match roof and wall sheeting.
SEALER:
This is to be applied at all side laps and end laps of roof panels and around self flashing

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 windows. Sealer shall be pressure sensitive elastomeric Butyl tapes. The sealer shall be non-
asphaltic, non-shrinking and non toxic and shall be superior adhesive metals, plastics and
painted at temperatures from 51°C to + 104°C.
CLOSURES:

Solid or closed cell closures matching the profiles of the panel shall be installed along the
eaves, rake and other locations specified on drawings.
FLASHING AND TRIM:
Flashing and / or trim shall be furnished at the rake, corners, eaves, and framed openings and
wherever necessary to provide weather tightness and finished appearance. Colour shall be
matching with the colour of wall. Material shall be 26 gauge thick conforming to the physical
specifications of sheeting.
FIXED GLASS WINDOW:
Fixed Glass windows of approved size & thickness are to be provided in wall panels.

GUTTERS AND DOWN SPOUTS:

Gutters and downspouts shall be adequately designed to ensure proper roof drainage system.
Material shall be same as that of sheeting.
CONNECTIONS:
SITE CONNECTIONS
a) All primary bolted connections shall be provided with galvanized high strength
bolts, washers, nuts conforming to specifications of grade 8.8 of IS 1367.
b) All secondary bolted connections shall be furnished with bolts, nuts, washers
conforming to the specifications of grade 4.6 of IS 1367.

SHOP CONNECTIONS
All shop connections shall be welded with appropriate arc welding process and welding shall
be in accordance with IS: 816, IS -819, IS1024, IS: 1261, IS1323, IS-9595 as appropriate.
The Webs should be welded on to the flanges at both the faces at top and bottom for
columns, beams and crane girders. Weld material should have strength more than the parent
metal.
ROOF & WALL BRACINGS
Roof and wall bracings shall have minimum yield strength of 250Mpa and shall conform to
the specifications IS 2062.

INTERNAL FINISH SCHEDULE

Internal finishes shall be as per specification/finishing schedule of control room building.

FLOORING

62mm thick cement concrete flooring with cement hardener topping under layer 50mm thick
cement concrete 1:2:4(1 Cement: 2 Coarse Sand: 4 Graded stone aggregate 20mm nominal
size), and top layer 12mm thick cement hardener consisting of mix 1:2 (1 Cement hardener mix
: 2 graded stone aggregate 6mm nominal size) by volume, hardening compound mixed @ 2

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 litres per 50kg of cement or as per manufacturers specification. The top surface to be finished
with epoxy paint of approved colour.

WALLS

In GIS Hall 250mm thick brick wall shall be provided up to 3.5 m (approx.) above plinth
level. 50mm thick puff sandwiched panels shall be provided above brick wall.

ROOF
50mm thick puff (density 40kg/cu.m.) sandwiched panels shall be provided.

EXTERNAL PLASTER AND PAINTING

Other external finishes shall be as per specification/finishing schedule of control room

building.

10.14. C CONTROL BUILDING WITH PRE ENGINEERED STEEL STRUCTURE

FRAME WORK :

i) Foundation system shall be of R.C.C Isolated/ Combined or Piles based on soil report with
R.C.C Tie beams/ Plinth beams and the base plate of steel columns shall be mounted on the
RCC foundation by means of foundation bolts.
ii) Pre engineered steel structure frame work for the super structure shall be as per material
specification of Pre Engineered GIS hall.
iii) Inside & outside walls shall be of brick masonry vide cl. No.10.14.3.
iv) 1st floor slab shall be of R.C.C. supported on steel beams with deck panels. Floor finish
shall be done in line with the general specification of control building.
v) The roof shall be of sloped, supported on steel frames & purlins and roof sheeting shall be of
puff panels in line with the specification of Pre Engineered GIS Hall. False ceiling shall be
provided below sloped roof and wherever required based on the plan of control building e.g.
conference room, PLCC ro
vi) Stairs shall be of steel structure with stringer beams of same material specification of pre
Engineered steel structure as mentioned above with R.C.C. tread and finished as per
specification of control building.
v) O.H water tank of capacity & specification of Control Building shall be placed suitably for
supply water at toilet blocks & drinking purpose.
vi) External surfaces of Control Building shall be finished with ACP panels of approved
thickness and make and tinted glass glazing shall be provided to have good architectural look.
vii) For plinth protection and all other internal and external finishing work which are not
covered in this specification general specification of control building shall be followed.

DOORS, WINDOWS AND COLLAPSIBLE GATE :

The Contractor shall supply and install doors and windows, according to the approved
drawings. Prior to the execution of the work, the contractor shall prepare and submit drawings
to Engineer for approval.

Steel Sections used for fabrication of doors, windows etc. shall be standard rolled steel sections
specified in IS:1038 and IS:1361 or as specified in approved drawing. All welds shall be
dressed flush on all exposed and contact surfaces.

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 For Collapsible Gate with (20x10x2)mm vertical channel 100mm center to center in fully
stretched position (20x5)mm flats as collapsible bracing properly riveted and washered
guide rail including
locking arrangements.

Aluminium sections for fabricating doors, windows, partitions etc. shall be extruded
sections conforming to IS:1948 and 1949 and of approved standard make and shall
be of approved thickness. Doors, frames, mullions, transom etc. shall be
anodized in a bath of sulphuric acid to provide a clear coating of minimum 20
micron thickness. The anodized material shall then be sealed by immersing in boiling
water for 15 minutes. A protective transparent coating shall be applied to the sections at shop.

Hardware and fixtures shall be of adequate strength and of best quality and from approved
manufacturers.

All coupling mullions, transoms, frames, etc. in contact with adjacent steel other members shall
be bedded in mastic cement and caulking done properly as per drawing and instruction of the
Engineer.

All windows shall be outside glazed, fixed with putty or metal glazing beads as shown on the
drawings. Aluminium glazing beads shall be snap fit type without visible screws and shall be of
sizes to accommodate thickness of glazing. Glazing beads shall be cut with mired corners.
Glazing clips, fixing devices etc. shall be supplied in adequate number.

Floor spring (HD), handle, EPDM gasket, weathering gasket, woolpile Locks, fasteners, etc,
shall engage positively, and key shall be non-interchangeable

Before bulk supply, the contractor shall submit to the Engineer samples of each type of
fabricated / manufactured items for approval. The samples shall be retained by the Engineer for
comparison of bulk supply and returned to the contractor towards the end for final
incorporation in the job.
Cutting to concrete or masonry shall be made good and all abrasions to shop paint shall be
touched up with paint of same quality as shop paint.

Glass and glazing for doors, windows, sashes, ventilators, fixed louvers, partitions etc. shall be
plain glass except as otherwise specified and shall be of uniform refractive index and free from
flaws, unevenness, stain or bubbles etc.

Glazing shall be carefully done in accordance with IS: 3348 and IS: 1083.

Clear glass shall be flat, drawn sheet glass and shall be at least 4 mm thick in steel windows &
5mm thick float glass (IS2835-1987) for aluminum windows. Float glass for doors shall be
minimum 6 mm thick.

Putty used for fixing glass shall be well mixed and spread out neatly to make an even surface.

After completion of glazing work, the contractor shall remove all dirt, stains, excess putty etc.
clean the glass panes and leave the work in perfectly acceptable condition. All broken, cracked
or damaged glass shall be replaced by new one, by the Contractor within the stipulated period
or till formal handing over of the installation.
All window openings shall be fitted with M.S grill (18kg/m2) unless otherwise specified.

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 A. STRUCTURAL GLAZING

SCOPE OF WORKS

The scope of work under this contract includes design, supply, installation, protection
guarantees, testing and maintenance up to the defects liability period of structural glazing,
openable panels, glass doors and fixed glazing.

The works under the section includes all labour, materials, equipments and services as required
for the engineering, preparation of shop drawings, testing, fabrication, assembly, delivery
anchorage, installation, protection and water proofing of the structural glazing openable panels,
glass doors and fixed glazing system. The materials, works etc. shall be as per relevant IS codes
and PWD specification and over all direction of WBSETCL.

FRAMES

Openable panels where indicated inclusive of all accessories, fittings etc. All caulking, sealing
and flashing including sealing at junction with roof water proofing and exterior wall, raised
kerbs and in window surrounds. Sealant within and around the perimeter of all work under this
section. Separators, neoprene/ EPDM and silicon gaskets, trims, etc. inserts in concrete anchor
fasteners etc. for the anchorage of all works under this section is subject to the approval of
WBSETCL.

REFERENCE AND STANDARDS

Materials and workmanship shall comply with the latest edition of the following standards as
follows (but not limited to this list of standards)

ANSI Z 97.1.84 Safety glazing materials used in buildings

ASTM C 1036-90 Specification for float glass
ASTM C 1048-90 Specification for heat treated float glass
ASTM C 864-90 Specification for compression seal gaskets
ASTM C 1115-89 Specification for silicon rubber gaskets
ASTM C 920-87 Specification for sealants
ASTM C 509-90 Specification for sealing materials
GTA specification No. 89-1-6 Specification for environment durability for
heat strengthened spandrel glass with
applied opacifiers
BSCP 118 Structural use of Aluminium.
In general the contractor may follow any international standards subject to his satisfying
WBSETCL that these specifications are equivalent to latest specifications issued by ASTM,
ISO, AAMA, BSS & SSIR or equivalent Indian standard as approved by WBSETCL.

ude but are not necessarily limited to the following items:

The contractor shall provide and install all supplementary parts necessary to complete all items
generally implied in the drawings and in the specification though not specifically shown or
mentioned.

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 These shall include providing, assembly and erection of all sections and anchor assemblies to
meet the performance and furnishing and installation of all inserts, fasteners, clips bracing and
frame work as required for the proper anchorage of structural glazing system elements to the
structure.

SHOP DRAWINGS

The contractor shall prepared shop drawings by necessary modification, if any to the
preliminary drawings and two copies of all shop drawings along with the plan and method to
execute the job mentioning the brand materials, other accessories to be used for the work shall
be submitted to WBSETCL for review and approval.

SYSTEM DESCRIPTION

The front seal structural glazing system is semi unitized system. In this specially designed
extruded aluminium mullions are fixed to the building structure by means of SS brackets of
angles of required size and length with necessary aluminium packing for true alignment,
suitable chinch anchor bolts of required length shall be provided for fixing the brackets. On to
this mullion, the transoms are fixed by means of pre-positioned angle cleats. After installing the
grid work of mullion and transom, the entire frame work is aligned in perfect line, level and
plumb. Drainage chamber, pressure equalization system and openable panel shall be provided.

FRAME WORK

Frame work consists of specially designed mullions. Selection of mullion will depend upon the
floor to floor height, distance between two mullions, wind pressure and other required
structural stabilities. Transoms shall be attached to this mullion by means of aluminium angle
cleats of required sections. The material shall be of reputed manufacturer as approved by
WBSETCL. Extruded section sample before anodisation shall be produced to WBSETCL for
approval.

All aluminium sections shall be blackmatt anodized to 15 microns minimum.

FASTENERS
The type, size, alloy and quantity and spacing of all fasteners and anchoring devices shall be as
required for the specified performance standards. The material shall be of reputed
manufacturer, as approved by WBSETCL.

GLAZED PANELS

These are factory made glazed panels of approved make (as of WBSETCL) which are brought
to site of work and are bolted on the pre-fixed grid work of mullions and transoms. The entire
safety and principle of structural glazing depends on these panels, in which the glass is bonded
to the aluminium frames by means of structural silicone sealant.

SEALANTS

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 All sealant applications must be clearly designated on the applicable shop drawing details and
reference to a master sealant schedule specifying materials special instructions and applicable
procedures.

GLASS

For structural glazing, minimum 6 mm thick grey, tinted heat strengthened glass shall be used
for spandrel areas and 24 mm thick insulated glass with 6 mm thick reflective toughened glass
+12 mm air gap +6 mm thick clear toughened glass for other areas. The colour of the glass
shall be as per the design of The WBSETCL. Prior to bringing the materials in bulk, sample
approval shall be done by WBSETCL. Material shall be of reputed manufacturer and approved
by WBSETCL.

GASKETS

Gaskets and seals shall be extruded EPDM of approved quality, compatible with substrates,
finishes and other components they are in contact with. All gaskets exposed directly on the
exterior face shall be silicon gaskets.

GUARANTEE

The Contractor shall provide full guarantee for structural glazing and other works carried out
by them in this contract which shall include:
Against non-failing of glasses
Sturdiness of the system
Against water penetration
Against air infiltration
Smooth operation of the doors.

10.14.01 ROLLING STEEL SHUTTERS/GRILLS:

Rolling shutters shall be made in accordance with IS:6248 from tested bright cold rolled,
annealed M.S. strips, not less than 0.9mm thick for shutters up to 4.5 M wide and Not less than
2.25 mm thick for shutters 5.5 M wide and above, machine rolled at 7.5 mm rolling centers,
interlocking with each other. The profile will be such as to prevent excessive deflection under
specified wind load.

Rolling grills shall be constructed out of 6 mm rods at 35mm Centers running horizontally
flexible connected with vertical links spaced not more than 200 mm centers. Alternatively,
rolling grills shall be made from perforated spots of approved design reinforced with 6mm dia
rods.

Guides shall be of such depth as to retain the shutter under specified wind pressure.

Shafts shall be of steel pipe of sufficient size to carry the torsional load with a maximum
deflection of 1/360th of span. Grease packed ball bearings or bushing shall be provided for
smooth trouble free operation.

Hoods shall be formed of not less than 20 gauge steel suitably reinforced to prevent sag.

Locks shall be slide bolt and hasp, or cylinder lock operable from one or both sides.

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 Operating chains shall be of tested quality, heavily galvanized and with all ends rounded to
assure smooth operations and hand protection.

Rolling shutters/grills shall be easily operable by one person with speed of operation at about
1.3 meters per second. In general, manually operated shutters shall be push pull type for
operating up to 9 sq. meter in area. Electrical motor operated Rolling shutters shall be provided
wherever required.

Shutters shall be painted with one coat of zinc chromate primer at shop and subsequently two
coats of painting as necessary.

After installation of the shutters, the contractor shall test the performance of the shutter in
presence of the Engineer. All control and locking devices shall give fault free performance.

10.14.02 MASONRY & ALLIED WORKS :

Bricks for generally masonry work shall be of first class (compressive strength = 100 Kg/cm2
minimum) well burnt, of uniform size, shape and colour free from crackles, flows or nodules of
free lime and emit clear ringing sound when struck. Fractured surface shall show uniform
texture free from grits, lumps, holes etc. Water absorption after 24 hours immersion shall not
exceed 20% by weight. The bricks shall show no efflorescence after soaking in water and
drying in shade and shall in general conform to the requirements IS: 1077.

The mortar shall be prepared by mixing cement and coarse sand in the specified proportion as
stated in the drawings or as instructed by the Engineer. Water shall be clear, free from organic
matters, acids, or soluble salts and other deleterious substances in accordance with IS
specifications. Generally, mortars in the proportion 1:4 (1 cement and 4 sand) shall be used in
brick masonry works in superstructure and mortars in the proportion 1:6 (1 cement and 6 sand)
shall be used in masonry works in substructure upto plinth level, unless otherwise specified in
the drawings or instructed by the Engineer. Internal partition walls of 125 mm and 75 mm thick
brick walls shall be laid with cement sand mortar in the proportion 1:4 and 1:3 respectively
with chicken wire mesh in every third layer.

All joints between bricks shall be kept uniformly 10 mm thick and shall be fully filled with
mortar.

All brick shall be laid in English bond with frog on top except for the layer just below D.P.C.
and in accordance with IS:2212.

25mm thick D.P.C. with cement concrete (1:1.5:3) and admixture of water proofing compound
with graded stone aggregate 10mm nominal size and painting the top surface with a coat of
bitumen of required grade.

The brick walls shall be truly vertical and all course shall be truly horizontal.

Masonry shall be cured by keeping it wet for seven days from the date of laying. In dry weather
at the end of days work top surface of masonry shall be kept by ponding.

Fly ash bricks(compressive strength=100 Kg/cm2) for masonry work can also be used as per
IS:13757 (latest revision).

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10.14.03 PLASTERING :

Generally, brick walls shall be cement plastered with mortar in the proportion 1:6 (1 cement
and 6 sand) The thickness of cement plaster on the inside and outside surfaces of brick wall
shall be 19 mm and 12 mm respectively. Ceiling of the roof shall be plastered with 6 mm thick
cement sand mortar in the proportion (1:4) unless otherwise specified in the drawings or
instructed by the Engineer.

For sand and cement plaster, sand and cement in the specified proportion shall be mixed dry on
water tight platform and minimum water added to achieve working consistency.

Plaster, when more than 12 mm thick, shall be applied in two coats a base coat followed by the
finishing coat. The base coat shall be allowed to dry and shrink before applying the second coat
of plaster.

The finished wall surface shall be true to plumb and the contractor shall make up any
irregularity in the brickwork with plaster.

Before plastering all the mortar joints shall be raked out to a depth of at least 12 mm. The
exposed brick surface and the joints shall be thoroughly cleaned and washed with clean water
and should be kept wet for at least 12 hours before commencement of plastering.

The plastering shall be started from top and worked downwards and ensure even thickness and
true surface. All corners, edges and junctions shall be neatly finished.

All drips, grooves, mouldings and cornices as shown on drawing or instructed by the Engineer
shall be done with special care to maintain true lines, levels and profiles.

After plastering work is completed, all debris shall be removed and the area left clear.

All plastered surfaces after laying, shall be watered, for a minimum period of seven days and
shall be protected from excessive heat and sunlight by suitable approved means. Moistening
shall commence as soon as the plaster has hardened sufficiently and not susceptible to damage.

10.14.04 FINISH :

Wherever any special treatment to the plastered surface is indicated, the work shall be done
exactly as shown on the drawings, to the entire satisfaction of the Engineer regarding the
texture, colour and finish.

Wherever punning is indicated, the interior plaster shall be finished rough. Otherwise, the
interior plaster shall generally be finished to a smooth surface. The interior surface shall
generally be finished with a wooden float.

Plastered surfaces, where an even smooth surface is specified, plaster of paris punning shall be
done.

Materials for plaster of Paris punning shall be from approved manufacturers and approved by
the Engineer. The thickness of the punning shall be 3 mm and shall be applied by skilled
workmen. The finish shall be smooth, even and free from undulation, cracks etc.

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10.14.05 FLOOR FINISH :

All types of flooring, skirting, dado and similar locations, the base surface to receive the finish
shall be adequately roughened by chipping, raking out joints and cleaning thoroughly all dirts,
grease etc. with water and hard brush.

A) ARTIFICIAL STONE FLOORING

Artificial stone flooring shall be laid in panels of shape and size as directed. The casting of
panels will be so programmed as to prevent bonding on the freshly laid panel with adjacent
panels. Suitable grading where required shall be provided in the flooring for drainage of water,
as directed by the Engineer. The artificial stone flooring shall be 25 mm thick concrete in
(1:2:4) cement : sand : stones chips (6-10 mm) including a skidding of 6.0 mm with cement
neatly troweled and finished.

B) CAST-IN-SITU TERRAZZO FLOORING

Cast-in-situ Terrazzo flooring shall consist of an under-bed and a topping laid over an already
laid and matured concrete base. Unless otherwise specified the total thickness of the finish shall
be minimum 40 mm for horizontal and 25 mm for vertical surface of which topping shall not be
less than 12 mm. While the topping shall be of uniform thickness, the under bed may vary in
thickness to provide necessary slopes. The under bed shall be made with a mix of 1 part
cement, 1 and 1/2 parts coarse sand and 3 parts stone chips (10 mm down) by volume. For
vertical surface, the mix shall consist of 1 part cement to 3 parts sand by volume. The mix for
topping shall be composed of cement colour pigment, marble dust and marble chips
proportions of the ingredients shall be such as to produce the terrazzo of colour, texture and
pattern approved by the Engineer.

The cement shall be white or grey or a mixture of the two to which the pigment shall be added
to achieve the desired colour. To 3 parts of this mixture 1 part marble powder by volume shall
be added and thoroughly mixed dry. To 1 part of this mix 1 to 1 and 1/2 parts of marble chips
by volume shall be added and thoroughly mix dry again. Water shall be added to the mixture to
make it workable but not too wet.

Dividing strips made of aluminum or glass covering the total depth of underbed plus topping
shall be used for forming the panels. The panels shall not be more than 1.5 sq.m. in area of
which no side shall be more than 1.2 m long. For exposed locations the maximum area of a
panel shall be 2 sq.m., The panel shall be laid in alternate bays or chequered board pattern.
After 12 to 18 hrs. of laying the surface shall be cured by allowing water to sand on the surface
by covering with wet sack for four days.
Grinding and polishing shall be done when the surface has sufficiently hardened as per
standard practice.

C) MARBLE FLOORING

For Marble flooring, every marble stone shall be cut to the required size and shape. The top
surface shall be fine chisel dressed to remove all waviness. The sides and top surface of slabs
shall be machine rubbed or table rubbed with coarse sand before paving. The thickness of the
slab shall be as specified in the description of the item. Base concrete or the R.C.C slab on
which the slabs are to be laid shall be 20 mm and the thickness at any place under the slab shall
not be less than 12 mm.

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 The slabs shall be laid in the following manner. Mortar of the specified mix shall be spread
under the area of each slab, roughly to the average thickness specified. The slab shall be
washed, cleaned before laying. It should be laid on top, pressed, tapped with wooden mallet
and brought to level with the adjoining slabs. The edges of the slab already paved shall be
buttered with grey or white cement with or without admixture with pigment to match the shade
of the marble slabs. After each slab has been laid, surplus cement on the surface of the slab
shall be cleaned off. The flooring shall be cured for a minimum period of 7 days. Joint
thickness shall not be more than 1 mm.

D) CERAMIC TILE FLOORING AND DADO / SKIRTING

GENERAL
This item relates to the furnishing of materials and installation of ceramic tiles in flooring,
dado, etc. Tiles shall conform to IS 15622 & workmanship shall be as per IS 1443.

MATERIALS

The ceramic tiles shall be of high quality of approved manufacturer as specified by WBSETCL.
No chipped, cracked, crazed or warped tiles shall be used. Glazed rounded corners and cups
(convex or concave) shall be provided at corner of walls, edge, junctions of floor and dado etc.,
if so specified. The mortar shall be in proportion 1:4 (cement: sand).

WORKMANSHIP

The surface to be covered shall be plastered rough to a thickness of 12mm. fix 12mm size stone
chips (5 nos. one in each corner and one in the middle of each tile wit adhesive viz., Araldite of
equivalent for keying action) or with approved chemical of reputed brand and the tiles shall be
soaked in water for at least two hours prior to fixing at site. A thin layer of cement paste shall
be buttered on the back of the tile and on the site after which the tile shall be pressed and
tapped home taking care that the corner tiles are perfectly matching. After the backing coat has
set the tile joints shall be grouted with neat, white cement with necessary pigment. All surplus
slurry that remains on the surface shall be carefully wiped off before it sets. Care shall be taken
to ensured that the finished surface is absolutely plumb and to proper levels without any
profusions, waviness of zig zag. Joints between tiles shall be uniform is straight level lines.
After completion of the entire work or part of it the surface shall be cleared of all stains, cement
etc. by washing with Oxalic Acid (1:10) or any other approved compound.

FIXING TILES FOR DADO AND SKIRTING/ FACIA

The dado work shall be done only after fixing the tiles/ slabs on the floor. The approved glazed
tile before laying shall be soaked in water for least two hours. Tiles shall be fixed when the
cushioning mortar is steel plastic and before it gets very stiff.

The back of the tiles shall be cover with this layer of the cement mortar 1:3 using fine sand
(table III, zone IV, IS 383-1963), and the edge of the tile smeared with neat white cement
slurry. The tile shall be then pressed in the mortar and gently tapped against the wall with a
wooded mallet. The fixing shall be done from bottom of wall upwards without any hollows in
the bed of joints. Each tile shall be as close as possible to one adjoining. The tiles jointed with
white cement slurry. Any thickness difference in the thickness of tiles shall be arranged out in

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 cushioning mortar so that all tiles faces are in one vertical plane. The joints between the tiles
shall not exceed 1.0mm in width and they shall be uniform.

After fixing the dado / skirting etc. they shall be kept continuously wet for 7 days.

CLEANING

After the tiles have been laid in a room or the day fixing work is completed, the surplus cement
grout that may have come out of the joints shall be cleaned off before it sets. After the complete
curing, the dado or skirting over shall be washed thoroughly clean. In case of flooring, once the
floor has set, the floor shall be carefully washed clean and dried. When dry, the floor shall be
covered with oil free dry sawdust. It shall be removed only after completion of the construction
work and just before the floor is used.

POINTING AND FINISHING

The joints shall be cleaned off with wire brush to a depth of 3 mm and all dust and loose mortar
removed. Joints shall be then flush pointed with white cement and floor kept wet for 7 days and
then cleaned. Finished floor shall not sound hollow when tapped with a wooden mallet.

E) GLAZED TILES
Glazed tiles shall be of total thickness between 20 mm and 25 mm including the underbed. The
tiles shall be of approved earthenware, covered with glazed white or coloured, of 300 mm x
200 mm nominal sizes and 6 mm thickness unless otherwise specified and shall conform to
IS:777. The mix for underbed shall consist of 1 part cement and 3 parts coarse sand by weight
mixed with sufficient water. The joints shall be cleaned and flush pointed with white cement
and cured for 7 days by keeping it wet. The surface shall be thoroughly cleaned with soap.
Acid and alkali proof tiles up to the height of 1500 mm over floor level to be provided in the
battery room of control building shall be of best indigenous manufacturer and having minimum
thickness of 25 mm for floor and 20 mm for skirting and shall have the adequate chemical
resistant properties. The tiles shall have straight edges, uniform thickness, plain surface,
uniform non-fading colour and textures and shall be approved by the engineer. Usually the
chemical resistant tiles shall not absorb water more than 2% by weight. The tiles shall have
minimum compression strength of 700 Kg/sq.cm. The surface shall be abrasion resistant and
durable. Acid and Alkali proof paint as per approved specification is to be applied over a cast
of primer on bare plastered wall.
The mortar used for setting or for underbed the tiles shall be durable and strong. The setting
and fixing shall be done according to the manufacturer's specification.

F) VITRIFIED TILES

Vitrified tiles (premium quality) of approved brand (600mmx600mmx10mm) to be laid in

floor & skirting on 20mm sand thick cement mortar and with 2mm thick cement slurry using
cement @2.91kg/m2 or using synthetic adhesive (3 to 4 mm thick layer) including necessary 25
mm thick backing cement concrete (1:2:4) with 6 mm size stone chips, laid after application of
slurry using 1.75 kg of cement per m2 , joints grouted with admixture of white cement and
colouring pigment to match with colour of tiles/synthetic cementatious grouting materials of

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 approved make as directed and removal of wax coating of top surface of tiles with warm water
and polishing the tiles using soft and dry cloth upto mirror finish.

E) KOTA STONE FLOORING, DADO & SKIRTING

Kota stone shall be of selected quality, hard, sound, dense and homogeneous in texture free
form cracks, decays, weathering and flaws. They shall be hand or machine cut and shall be of
approved colour of even shade as far as permissible. The stones having yellowish strips, dent,
black patch and broken edges shall not to be used. The slabs shall conform to the sizes of 600
mm X 600 mm or as required and shall be laid to pattern as directed. The edges will be perfect
vertical and in right angled to each other. Minimum thickness of slabs hall be 20 mm and the
minimum thickness of floor finish including bedding mortar shall be 40 mm or specified in the
relevant items of BOQ and PWD and IS specification. The floor surface to be tiled shall be
closely picked or hacked and thoroughly watered and cleaned. Mortar for bedding shall be 1
part of cement, 4 parts of sand with a layer of neat cement slurry. The stone slabs shall be laid
on this bedding immediately and as each stone is laid it shall be taped with a wooden mallet
and set. Flush joints shall not exceed 1 mm thick and shall be as per pattern indicated by
WBSETCL. The joint shall be set closed with white cement, stone dust, adhesive and
admixture of pigment matching the shade of Kota stone. After the work has set, the surface
shall be machine polished to the satisfaction of WBSETCL. The final polished surface shall
than be washed of all dirt, mortar, etc. by using Oxalic Acid and handed over in a neat
condition. Measurement will be taken on finished dimensions. Before the start of Kota laying
work, approval should be taken from WBSETCL on sample work and the approved samples
shall be kept at site for ready reference. For dado, 120mm high,300m wide and 20mm thick
Kota shall be fixed in wall, raised from plastered surface matched with floor joints or as
directed by WBSETCL.

10.14.06 CARPENTRY & JOINERY :

All timber shall be best quality seasoned Sal, Gamari wood free from large or loose knots,
cracks or other defects. Timber shall be treated with approved wood-preservative before use.
Before starting the carpenter's work, the Contractor shall have the rough timber approved by
the site Engineer of WBSETCL.
Plywood shall be standard waterproof quality or with veneered decorative surface. Unless
specifically permitted otherwise the adhesive used in plywood shall be phenol-formal-dehyde
resin of BWR grade conforming to IS: 848.
Flush doors of approved thickness of deluxe decorative quality conforming to IS: 2202
consisting of top, bottom rail and side styles of well seasoned timbers 65mm wide each and the
entire frame fitted with 27.5mm wide battens places both ways in order to make the door of
solid core and internal lipping with teak, mehogony or rose wood approved decorative veneer
faces and hardwood edges. The core for solid core doors shall be of block board or wood
particle board. Manufacturer's literature and test certificates shall be submitted for the approval
of the Engineer. Adhesive used shall be phenol formaldehyde of BWR grade, conforming to
IS:848.
Panel door shall be of sal wood frame and gamari wood rail and styles & factory made panel
wood panels and shall conform to relevant IS code.

Fixing of frame and partitions shall generally be done with 40 mm x 6 mm x 300/200 mm long
M.S. holdfasts bifurcated at end and grouted with 1:2:4 cement concrete.

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 Carpentry and joinery work hall be done as per relevant I.S. Code details shown on drawings
and as directed by the Engineer. All carpentry work shall have first class workmanship to give
a neat finish.

The gap between masonry and external door and window frame shall be caulked with
polysulphide mastic.

PVC panel door of approved make (SINTEX DWUF-309,DWUF-313,SPUF-101etc.) &

thickness shall be used for toilets.

All carpentry work after finishing shall be sand papered smooth. An approved prime coat paint
shall be given after inspection of the Engineer to all surfaces other than those which shall be
subsequently polished or covered with laminated plastic sheet.

10.14.07 PAINTING, WHITE WASHING, DISTEMPERING ETC. :

Paint used in the work shall be ready-mixed oil bound synthetic enamel paint of highest grade
product of well-known approved manufacturer. The paint shall be brought to site in original
sealed containers, bearing brand name, manufacturer's name and colour shade, with labels
intact and seals unbroken. Under no circumstances, shall the paint be diluted with turpentine or
linseed oil or otherwise. All material shall be subject to inspection and analysis and approved
by the Engineer. All prime coats shall be compatible to the material of the surface to be
finished as well as to the finishing coats to be applied. Surfaces such as plastered surface,
concrete, masonry, misc. steel materials should be wire brushed, sand-papered clean and free
from oil, grease, efflorescence, foreign loose materials to receive the approved paint.

All colour shall be as per painting schedule and tinting and matching shall be done to the
satisfaction of the Engineer in such cases, where samples are required, they shall be executed in
advance with the specified materials for the approval of the Engineer.

White washing shall be done from pure shell lime or fat lime, or a mixture of both as instructed
by the Engineer and shall conform to IS:712. Samples of lime shall be submitted to the
Engineer for approval and lime as per approved sample shall be brought to site in unslaked
condition. After slaking, it shall be allowed to remain in a tank of water for two days and then
stirred up with a pole, until it attains the consistency of thin cream. 100 gms. of gum to 6 liters
of white wash water and a little quantity of indigo or synthetic ultramarine blue shall be added
to the lime.

The surface shall be cleared of all loose materials and dirt. All holes and irregularities of the
surface shall be filled up with lime putty and shall be allowed to dry up before application of
the lime solution.

One coat of whitewash shall consist of one stroke from top downwards, another from bottom
upwards over the first stroke and another from left to right before the previous one dries up.
Second coat and third coat shall be applied similarly. In case the Engineer feels that more coats
are required the contractor shall do so without any extra cost to the owner. No brush marks
shall show on the finished surface.

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 Oil bound washable distemper shall be applied after surface is primed with an alkali resistant
primer and followed by minimum two coats of oil bound washable distemper all as per
manufacturer's instruction and to the satisfaction of the Engineer.

Waterproof cement paint shall be applied as per manufacturer's instruction over a coat of
approved primer. Surface shall be washed and brushed down. One coat of paint shall be given
as soon as the moisture has disappeared. Care shall be taken so that the paint does not dry out
too rapidly. After 4 to 6 hours, the water shall be sprinkled over the surface to assist curing and
prevent cracking. Second coat shall be applied after the drying out of the first coat (24 to 48
hrs.) Finished surface shall be kept moist by occasional sprinkling for seven days after painting.

Two coats of protective and decorative texture exterior high class matt finish composed of
special thermoplastic resin containing fine crystalline additives derived from granite (weather
coat etc.) paint for outside wall of approved quality as per manufacturers specification and as
per direction of Engineer in Charge to be applied over a coat of exterior primer as required by

Applying two coats of acrylic emulsion paint Luxury quality of approved make over a coat of
cement based primer for interior surface.

Two coats of protective paint for chemical and weather resistance shall be applied for battery
room.

10.14.08 ROOF WATER PROOFING, INSULATION AND ALLIED WORKS FOR

CONTROL ROOM BUILDING / INTEGRATED BUILDING:

Water proofing with a coat of polymer modified waterproofing slurry (SIKA TOP SEAL-107
or 109 hi) on roof before laying 25 mm thick Roof tiles, laid over cement screed concrete
(1:2:4) with 6 mm down stone chips of average thickness of 40 mm and with proper slope

The surface of roof shall be roughened and thoroughly cleaned with wire brush and water. Oil
patches, if any, shall be removed with detergent. The surface shall be dried thorough and swept
clean.

Exposed surface of roof of building to be treated for water proofing by the polymer modified
waterproofing slurry application shall be thoroughly cleaned and the same to be applied as
specified by the manufacturer prior to taking up screed concerting grading plaster on roof. The
material shall not have any adverse effect on the surface on which it is applied and must stick
to it uniformly to make a strong durable bond. It shall not be affected by short duration from
fire, sun, light traffic. The application shall be resistant to growth of fungus and proof against
saltpeter action.

If desired by the Engineer, a sample shall be prepared in advance and tested for water proofness
for 48 hours under 300 mm depth of standing water. The Contractor shall arrange the
demonstration by providing materials and labours for the application.
The underbed shall not be laid under direct hot sun and shall be kept in shade immediately after
laying so as to avoid quick loss of water from the mix and separation from the roof surface. The
under-bed shall be cured under water for at least 7 days.

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 The under-bed shall be laid to provide an ultimate run off gradient not less than 1 in 100 and as
directed by the Engineer. Under-bed shall usually be composed of cement concrete, as stated
above.
The under-bed shall be finished to receive the laying of roof tiles.

Now 25 mm thick precast roof tiles made of cement concrete with stone chips as per approved
strength and density set in 40 mm (average) thick with Cement Sand Mortar(1:3) and filling
up the joints(3 mm wide)with Cmennt Sand mortar(1: 1)applying cement slurry @ 1.75 kg per
Sq.m back of tiles and then setting close the precast tiles, finishing up the joints with silicon
sealant of approved quality including providing 150 mm high skirting with the same tiles
flushed with the inside surface of parapet wall finishing the mouth of rain water pipes curving
etc. as necessary complete as per direction of the Engineer.

10.14.09 SUSPENDED CEILING WITH SNAP GRID SYSTEM:

Suspension system shall consist of the grid supporting the ceiling panels, air conditioning
pipes, intermediate runner supports for the grid if any and hangers, wall angles etc., required to
suspend the grid or the runners from structural works, slabs and beams.

All members of the suspension system shall be of sufficient strength and rigidity to carry the
ceiling boards in a true and level plane without exceeding a deflection of 1/360th of span.

All joints in ceiling panels shall run straight and cross joint shall be at perfect right angles.
Angle moulds where shown on drawings shall be securely fixed to walls.

All drilling on structural concrete and installation of suitable anchoring device for installation
including welding of the suspension system shall be done as per requirement.

All M.S. sections used for supports etc. shall be given two coats of synthetic enamel paint over
a coat of red lead primer.

Aluminium grid ceiling system shall be of approved make. Aluminium tees as intermediate
members and aluminium channels / angles as end pieces will be assembled in the form of grid.
Size of tees, cross tees and channels etc.shall be as shown on drawings. Main runners shall be
hung by M.S. flats, angles, rods etc. at maximum 1.2 meters centres. Extra hangers shall be
provided at lighting fixtures those are to be supported from the ceiling system. Turn buckles
shall be provided with M.S. rods for adjustment in levels.

Ceiling panels shall be of decorative, huymidity resistant, fire resistant, sound and thermal
insulation, white texture Gypsum Boards manufactured by reputed approved manufacturer,
samples of which shall be submitted for Engineer's approval.

Cut outs in the ceiling for light fixtures, air conditioning diffusers etc. shall be provided as
shown on drawings.

Finished ceiling shall be at the correct plane and present a pleasing and uniform appearance,
free from sags, warps, disfigured or damaged board.

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 Prior to delivery of ceiling components, drawings of the complete suspended coiling system
shall be submitted to the Engineer for approval. Drawings shall furnish the following
information :

a) A reflected ceiling plan of areas indicated to receive the ceiling showing electrical and
mechanical features.
b) Typical intermediate framing for support where required.
c) Hanger fastening details.
d) Panels unit support at ceiling penetrations.
e) Details of splicing method for main and cross runners.
f) A table indicating load bearing capacity of main and cross runners.
g) A note stating that suspension system member furnished will not deflect more than
1/360th of a 1.2 meters span under the indicated loading.

10.15 WATER SUPPLY, PLUMBING & SANITARY FIXTURES AND SEWAGE

DISPOSAL SYSTEM:

GENERAL:

The contractor shall have to submit the design drawing of the water supply system to control
building / Integrated Building and other utilities for approval and execute the same as required.

The water supply system shall consist of sinking deep tube wells and allied water distribution
system from the tube well to residential and other buildings, store-shed, control building /
Integrated Building etc. The sewage disposal system shall consist of drainage from control and
other buildings including necessary fixtures and waste treatment unit like septic tank, soak pit
etc. All design, drawings, materials, devices, appliances, fixtures etc. shall be submitted to
Engineer for approval before fixing.

Principal items of work to be performed and materials, equipment, devices and appliances to be
furnished and installed hereunder, include the following :

a) Sinking of deep tube wells and installation of submersible pumps of adequate capacity
with all accessories, fittings, cabling and automatic level control switch, pump houses
of adequate size.

i) Boring tube-well of 150x100 mm dia by rig boring method through any type of soil
strata including hire and labour charges for boring pipes, scaffoldings, tools and plants
etc.as necessary upto the required depth assuming guaranteed discharge of potable
water.

ii) The work includes verticality test, water sample test, washing and developing tube-
well with air compressor pump and test for yield etc. complete.

iii) Supply, fitting, fixing of 100 mm dia brass strainer of leading brand and approved
quality having a minimum length of 18.2 mtrs., cutter piece, G.I. Pipes and all types
of specials as required for successful commissioning of the tube-well and pump.

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 iv) Packing the annular space between the outside of the tube-well pipes, strainer and the
bore with pea sized screened gravel of approved quality and size for most of the bored
length excepting the top 10 to 15 mtrs. which shall be filled with clay of impervious
nature.

v) Supplying, installation and commissioning of approved make, model and capacity

submersible pump-motor set suitable for installation of 150x100 mm. Dia. Tube well
complete with wet winding type submersible type motor suitable for operation on 415
volt A.C., 3 phase 50 cycles including supply complete with 4 core submersible cable
with size and length as required along with supplying, fitting and fixing necessary
panel board of suitable DOL type MC-1 push button starter with over load and no
load relays of approved make and installing non return valve of approved make and
size with all necessary fitting, fixtures etc. complete as per direction of the Engineer.
The installation shall comprise of pump motor set submerged in water within casing
pipe with required length of submerged 150 mm. Dia. G.I. pipe cable fitting and
fixing hooks, steel cords, foot and check valves, clamps, caps, connecting with panel
board, concrete encasement round about the housing pipe to discharge pipe complete
in all respect.

vi) G.I. pipes for deep tube well shall be of heavy duty.

b) Construction of a suitable R.C.C. overhead reservoir with necessary inlet and outlet
arrangements as per requirement including wash outlet.

c) Delivery piping from medium type G.I. from R.C.C. overhead reservoir to individual
overhead storage tanks placed on the roof of control building, stores, security barrack
and residential buildings etc. with necessary bends, tees and other fitting etc.
complete.

d) Distribution mains from respective pumps to buildings with necessary valves, fittings
etc. complete where provision of R.C.C. overhead reservoirs has not been made.

e) All floor drains complete with piping and trap etc.

f) All waste and vent piping, with connections to each fixture and piece of equipment
requiring a waste connection.

g) All building water supply piping (internal) as required including connection to each
fixture and piece of equipment requiring water.

h) All plumbing fixtures and accessories.

i) Pipe ends for flushing.

j) Piping and 12 mm hose with bibcock for landscaping and gardening.

k) Separate waste water treatment unit for various buildings including septic tank, soak
pit etc. complete including disposal arrangement.

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10.15.01 WATER SUPPLY :

The water supply system to the buildings covers service pipes and the necessary connecting
pipes, fittings, control valves individual overhead PVC Tanks or RCC tank (as per requirement)
and all appurtenances in or adjacent to building.

All materials, fittings, valves, stop cocks, taps and other appliances shall be of best quality
conforming to the relevant Indian Standard and shall be procured from approved manufacturer
to be decided by the Engineer.

All pipe line shall be laid true to line, plumb and level and as per approved drawing. Care shall
be taken to avoid chances of airlock and water hammer.

Underground piping (medium or heavy type of approved make) shall be laid at such a depth
that it is not likely to be damaged by traffic or other loads. The size and depth of the trench
shall be approved by the Engineer. Backfilling shall be done with selected fine earth in 150 mm
layers and carefully consolidated.

Where desired by the Engineer or shown on the drawings, the pipes shall be concealed in
masonry or concrete of the structure.

All pipes medium or heavy type of approved make shall be seamless and of best quality
galvanized iron conforming to the relevant Indian Standard. All fittings, hangers, supports,
straps, clamps etc. shall be of approved quality.

Threads shall be cut with sharp tools and before jointing all scales shall be removed from pipes
by suitable means. Before jointing the threads shall be treated with approved pipe jointing
compound.

G.I. pipes shall be given a coat of zinc chromate primer and two coats of best quality synthetic
enamel paint as approved by the Engineer All brackets, supports, clamps etc. after installation
shall be painted with two coats of synthetic enamel paint. Underground and concealed pipes
shall be painted with two coats of approved bituminous paint.

Layout and route shall be marked in place and approved by the Engineer before actual laying
starts.

Route marking shall be provided with route marker at suitable interval as per direction of
Engineer in charge.

All pipes, fittings and appliances shall be inspected before laying and shall be sounded to
disclose cracks. Any defective item shall be clearly marked as rejected and forthwith removed
from the site.

After laying and jointing, the service pipes shall be slowly and carefully charged with water
allowing all air to escape to avoid chances of air lock and water hammer.

The service pipe shall then be inspected under working conditions of pressure and flow. When
all draw off taps are closed, the service pipes shall be absolutely water-tight. All piping, fittings
and appliances shall be checked for satisfactory support and protection from damage, corrosion
etc.

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10.15.02 DRAINAGE AND SANITATION:

The contractor shall have to submit design & drawing of the waste water system as part of the
total drainage scheme for approval and execute the work as required.

Drainage and sanitation covers the total layout and construction of drains for roof water,
surface water and waste water from Bathroom, kitchen etc. and sewage together with all
fittings and fixtures and inclusive of ancillary works, such as connections, manholes and
inspection chambers used within the building and from the building to the connection to a
sewer main or to septic tanks, soak pits and chlorination chamber, if so required.

All pipelines, fittings and fixtures shall be installed leak proof as per drawings or as directed by
the Engineer. Correctness of lines, plumb, orientation, symmetry and levels shall be strictly
ensured. The connections shall be such as to prevent any splashing or splitting or emission of
foul odour and gases.

Soil, waste and drain pipes, traps and fittings for under ground work shall be heavy duty
stoneware/cast iron soil pipe as shown on drawings and as per instruction of the Engineer. Soil,
waste, vent and drain pipes, and fittings above ground shall be of heavy cast iron as approved
by the Engineer. Vent pipes shall be covered on top with a cowl made of C.I.

The cast iron pipes and fittings shall be effectively protected against corrosion by painting two
coats of approved anti corrosive paints.

Underground pipes may be supported on suitable concrete or brick supports so that there is no
undue strain at the joints or on the pipes. Pipes shall be secured to the supports by approved
means.

For vertical runs each pipe shall hang freely on its brackets fixed just below the socket. Suitable
spacer blocks shall be provided against the vertical surface to which the pipe is fixed.

Every joint in the cast iron pipe line shall be made with a gasket of hemp or yarn, and pure soft
lead properly caulked so as to preserve the continuity of the drain without obstruction. All
connections shall be made perfectly water tight. All bends junctions shall be supplied with
watertight cleanout.

Rain water pipes shall be of C.I. of I.S. quality and of the size as specified on drawings. All
rain water pipes shall have suitable gratings at the inlet opening at roof and floor shall be well
secured and supported by adequately strong brackets. Where desired by the Engineer the rain
water pipes may have to be installed in chases cut in the structure.

Rain water pipes shall be painted outside with two coats of anti corrosive paints over a coat of
primer as approved by the Engineer.

Roof and floor drains and yard gullies shall be installed, if required by cutting into the structure
and grouted with 1:2:4 cement concrete. All gutters shall be provided with removable C.I.
gratings.

Manholes and inspection chambers shall be provided at suitable distances as per standard
practice and as directed by the Engineer.

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 Manholes shall be provided with medium duty C.I. covers of 32kg weight (size-600 mm x 450
mm). The covers shall be close fittings so as to prevent gases from coming out.

Septic tank and effluent disposal system shall be well designed and construction to be made as
per approved drawing. Septic tank shall consist of the tank itself with inlet and outlet pipes,
fittings there from complete with all necessary earthwork, backfilling, masonry, concrete,
manhole etc. The effluent from the septic tank shall be disposed by allowing it into a soak pit of
approved size and specific design and as directed by the Engineer.

Septic tanks (R.C.C) and soak pits shall be designed to have capacity as follows :
a) AIS Control Room Building. : 50 users
b) GIS Integrated building : 15 users.
c) C -type quarters (single unit) : 15 users.
d) Dormitory (six units) : 50 users. (each bldg.)
e) Store-shed : 15 users
f) Store-shed with office : 15 users
g) Security Barrack : 15 users

The septic tank shall be tested for water tightness. It shall be filled up with water and allowed
to soak for 24 hours. Next day it is again filled up by compensating the losses if any and
allowed to stand again for 24 hours and loss of level recorded. The fall shall not be more than
15 mm.

All fixtures and fittings shall be connected by watertight joints. No dripping shall be accepted.

All Sanitary fixtures and fittings shall be of approved I.S. quality and type manufactured by
well known manufacturers. All items brought to site must bear identification marks of the type
of the manufacture. After the fixtures are brought to site, the contractor shall arrange for their
inspection by the Engineer and only after approval, the fixtures shall be installed. All broken,
damaged and rejected fixtures shall be removed from the site within two days after inspections.

WATER CLOSET:

a) Raised type European water closet shall include glazed vitreous china basin with
siphon, open front solid plastic seat and plastic cover, low level glazed stoneware
flushing cistern with valve less fittings, supply connections and necessary fittings. All
fittings shall be chromium plated. Colour of basin, cistern seat and cover shall be
approved by the Engineer.

b) Squatting type water closet shall include glazed vitreous china pan with foot rests and
low level PVC flushing cistern of approved make with valve fittings, supply
connection and necessary fittings.

Urinals shall consist of wall type glazed vitreous china urinals, cast iron automatic flushing
cistern complete with supply connections, flush pipe, connecting pipes, gratings, traps and all
other necessary fittings. Automatic flushing shall be approximately once every five minutes.
Two or three urinals located together may be served by one cistern of adequate capacity
including laying of white vitreous chinaware (600x150mm) half round channel. All fittings
shall be chrome plated.

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 Wash basin shall be glazed vitreous china, flat back wall hung by cast iron brackets and
complete with pattern with cold water brass faucet with nylon washers, waste chain, waste
washers, flexible waste pipes with traps, perforated waste complete with necessary fittings. All
fittings including faucet shall be chromium plated.

Sink shall be glazed stoneware, wall hung by painted cast iron brackets and complete with one
faucet with nylon washers, waste chain, waste washers, flexible waste pipes with traps,
perforated waste with necessary fittings. All fittings including faucet shall be chromium plated.
Wall mounted Sink (heavy) of stainless steel with/ without drain board as necessary of
approved make 560x410x254 size(inside) shall be used in all utility buildings
Bathroom mirrors shall be made of best quality 6 mm thick glass of size 600 mm x 450 mm
and produced by a reputed mirror manufacturer, wall mounted with adjustable revolving
brackets. The brackets and other fittings shall be chromium plated.

Glass shelves shall consist of 6 mm thick clear glass of size 600 mm x 125 mm with guard
rails, wall mounted with brackets. All brackets & guard rails etc. shall be chromium plated.

Towel rails shall be chromium plated 20 mm diameter and 600 mm long with brackets. The
brackets, screws etc. shall be chromium plated.

Soap holder shall be chromium plated wall mounted with brass plated screws.

Liquid soap dispenser shall be round and easily revolving with removable threaded nozzle. The
body, bracket for wall mounting shall be chromium plated.

All plumbing fittings and fixtures shall be installed by skilled workers and shall be perfect in
level, plumb, plane, location and symmetry. All items shall be securely anchored to walls and
floors. All cuttings in walls and floors shall be made good by the Contractor.

10.16 CABLE TRENCHES, RACKS ETC. :

Cable trenches shall be constructed in accordance with the detailed drawings to be developed
by the contractor and approved by the Engineer.

The cable trenches shall be of reinforced concrete of grade M20 unless otherwise directed by
the Engineer. All concrete work shall conform to IS: 456 2000.

Cable trenches shall be cast in lengths not greater than 35 M with alternative lengths cast at one
time. Joints between succeeding lengths shall be sealed with continuous P.V.C. water barriers
of approved variety to the satisfaction of the Engineer.

At road crossing R.C.C. box culvert type cable Trench shall be provided.

Cable trenches shall be provided with appropriate slope to facilitate drainage. On completion
the trenches shall be thoroughly cleaned.

The contractor shall provide cable trays including necessary supports at intervals not exceeding
1.2 M as per approved drawing. The supports shall be of M.S. Angle of minimum section
50x50x6 mm and shall be properly welded with M.S. insert plates and Lugs of M.S. Flat
section duly embedded in walls Two coats of synthetic enamel paint of approved make over
one coat of primer shall be provided on steel surfaces. In addition, continuous earthing of

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 supports etc. shall be provided as per electrical requirement and specification of cabling
system. The cable trays shall be of approved width and shall be made of galvanized perforated
M.S. Plate having minimum thickness of 3 mm. Entry of cable at main control room will be
through (minimum) two nos. cable trenches of adequate size and through sufficient numbers of
PVC pipes one end sealed as per approved drawing Cable trench layout should provide one
separate cable trench along each bay. Cable trays should be designed to accommodate all
cables required in this present scope of work as well as to accommodate all cables for future
bays as specified in electrical specification in proper dressed up fashion without overlapping of
cables on trays.

The contractor shall submit detailed drawings of trench cover slab and details of supporting
steel works at trench inter-section along with details of design calculations for approval of the
Engineer. Trench cover slabs shall be designed for live load of 1 T/Sq.m. However, the
thickness of slab shall not be less than 100 mm. The cover slab shall have proper lifting
arrangement. This arrangement shall not in any way obstruct free movement over the trench.

In the event of cables laid in HDPE pipes, the Pipes should conform IS-14333, IS- 4984-1995
including its latest revision. Proper arrangement for jointing with RCC cable trench is to be
ensured & necessary inspection pits at suitable intervals are to be provided.

10.17 STORM WATER DRAINAGE SYSTEM:

The contractor shall submit the design drawing for approval and execute the work of storm
drainage system including the bath room and other waste water (excepting the WC waste water
system).

Storm water drainage system shall be designed in two parts :

i) Main drains and

ii) Auxiliary drains

Main drains shall be designed as a net work covering total storm and cable trench water of the
substation, quarters and entire open area. Attempts shall be made to convert existing
construction drains, if any, into main drain as far as practicable. Auxiliary/branch drains shall
collect discharge from various buildings and then be connected to main drain at suitable
location. In addition, catch water pits and underground pipe lines shall be provided at required
intervals to connect the same to the main drain. R.C.C. pipe culverts/box culverts shall be
provided to carry drainage at road and cable trench crossings. Underground storm water piping
shall be limited to required areas where surface drainage are not desirable or practicable from
other functional point of view.

The drainage system shall be designed for precipitation intensity of 50 mm per hour (maximum
hourly intensity of rainfall).

Surface drains including plinth protection drains of all utility buildings shall be of rectangular
section of R.C.C. Grade M 20 and will have adequate slope in longitudinal direction. R.C.C.
structures will be provided at drops/falls to prevent scouring R.C.C. cover slabs over drains
shall be provided at all approaches as required.

All flow will be by gravity with a flow velocity of 0.6 to 1.0 metre/sec.
Co-efficient of run off will be 0.5 except for roads and paved areas where it will be 0.9.

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 The waste water from Bath, Wash Basin & Kitchen shall be disposed to surface drains and
waste water from Toilet & W.C shall be disposed to Septic tank and soak pit.

The storm water drainage from switchyard and utility area is to be terminated to a out fall
structure at a suitable approved location, with an adequate drop, outside sub-station premises
and with a dispersal structure (drain, culvert etc.), if so required.

10.18 RAIL-CUM-ROAD:
The contractor shall design and construct rail-cum-road for 400KV, 220 KV & 132 KV sub-
stations within the switchyard for transport of transformers & reactor as per the tender
drawings and subsequent approved drawings. Rail-cum-road shall be of RCC and with jacking
and winching pads as required. It shall be of length measured from the edges of transformers or
reactor foundations, extending 4 (four) meter minimum or as per requirement beyond the outer
road edge running orthogonally for movement of the transformer or reactor.

The contractor shall also supply and deliver all materials required for the construction of the
rail-cum-road.

10.19 OIL SOAK PITS :

The contractor shall design and construct, for each transformer of 20 MVA or above / reactor, a
soak pit along with the transformer/reactor foundation for collecting/draining of complete oil in
the transformer/reactor during emergencies. The size of the soak pit shall be guided by the plan
size of the transformer/reactor plus 1.2 M or so extra width on four sides. The pit shall be filled
up with graded gravels of 40-65 mm size and the void volume of the soak pit shall be kept not
less than 33% of the oil capacity of the transformer/reactor. The top of the RCC side walls of
the soak pit shall match with the top of the foundation. The soak pit shall be filled with gravel
to a minimum depth of 300 mm from F.G.L upto required depth as per slope (1:70). The
bottom of the soak pit shall be kept below the ground level and the oil collected in the pit shall
have to be drained to the oil sump by RCC Hume pipes of suitable diameter. Suitable slope
shall be provided so that entire quantity of oil can be quickly drained out from the soak pit to
sump by gravity. A number of inspection chambers shall be provided at 20 M intervals along
the pipe line length for cleaning and maintenance purpose. Suitable galvanized M.S. Grating
shall be provided at the outlet of the soak pit. The walls and floor of the pit shall be of concrete
grade M20.

In all cases, the oil soak pit shall be designed, so as to serve towards collection of oil etc. for 50
MVA 132/33 KV Transformers -for 132 KV sub-stations, in order to meet future augmentation,
160 MVA 220/132 KV Transformers -for 220 KV sub-stations & 315 MVA 400/220KV
Transformers & Reactor- for 400 KV sub-stations.
10.20 OIL / WATER SUMP :
The contractor shall design and construct one oil/water tank sump for collection of oil drained
from the transformers/reactor. The sump shall also be used for collecting rain water from the
oil soak pits. The water collected in the sump shall be delivered to the drainage system outside
Substation area through suitable arrangement. The sump shall have a wall dividing it into two
chambers and this wall shall work as oil-water separator. The sump shall be provided with two
manholes and air vents/explosion vents as necessary. The sides and floor of the sump shall be
plastered and painted with oil bound paint. The capacity of the sump pit shall be such as to

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 accommodate 120% of oil volume of the highest capacity transformer/reactor in the sub-
station.

For all 132/33 KV sub-stations the capacity of sump pit shall not be less than 120% of oil
volume of 50 MVA transformer so as to cater the future need.

For 220/132KV, 400/220KV sub-stations, the contractor shall design and construct
transformer/reactor soak pit and oil/water sump on the basis of design parameters of such
individual transformers/reactor to be obtained from concerned manufacturer duly approved by
the Engineer.
The contractor shall supply, install and commission suitable sump pump of adequate capacity
for pumping out oil/water from the sump. The oil/water sump pump may be installed along
with storm water drainage pump in the common pump house to be constructed for storm water
drainage as described in Clause 10.21. In case, the storm water drainage pump house is located
far away from the oil/water sump location, the contractor shall have to design and construct a
separate pump house of covered area 4 sq.M to install the oil/water sump pump.

10.21 DRAINAGE SUMP, SUMP PUMP & PUMP HOUSE / DEEP TUBE WELL PUMP
HOUSE :

The contractor shall design and construct a drainage sump cum pump house (covered area = 10
Sq.m), supply and install a suitable pump of adequate capacity for efficient draining out of
entire storm water from the switchyard & water coming from oil/water sump to the nearby
drainage system outside Substation. Construction of sump cum pump house and supply &
installation of sump pump are no longer required if gravity flow is feasible for disposal of
storm water to outside drainage outfall. One of the deep tube well pump house shall be of 4
sq.m. Floor area to accommodate operating switch, electrical panel etc. & other shall be
accommodated in the fire fighting pump house.

10.22 FIRE FIGHTING RESERVOIR/ PUMP HOUSE:

The contractor shall design and construct a suitable fire fighting reservoir of capacity a)for
400KV S/S -2 nos of volume 245 cum each, interconnected b)for 220KV S/S
&132KV S/S- 135 cum of capacity) for 132/220KV GIS - 60 cum capacity as per schedule of
works and fire fighting pump house with external steel ladder. The area of fire fighting pump
house and other details for 400KV S/S shall be as per electrical specification and requirement.
The same for the 220KV & 132KV Sub-Stn. shall be of 10 sqm. floor area or as per
requirement to accommodate operating switch, electrical panel for one of the deep tube-wells,
submersible pump and both the fire fighting pumps to be operated by electrical motor & diesel
motor.
Inside surface of the reservoir alongwith sump pit should be finished smooth with cement sand
mortar with necessary water proofing compound including pressure grouting with grouting
material for stopping leakage as necessary and finally painting with epoxy paint.

For all the Reservoirs(Fire fighting,oil water sump etc.) 230mm(minimum) wide Rubber water
stop shall be provided at construction joint between floor slab and wall and at other
construction joints.

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10.23 COMPOUND WALL ENCLOSING COLONY AREA :

The contractor shall design and construct 1.8 M high boundary wall around entire residential
colony area as per approved drawing. The boundary wall shall be of R.C.C. of grade M-20 and
250 thick brick work (1:4) with cement and sand plastering (1:4) having thickness of 19 mm
and 12 mm on the external and internal side respectively. Expansion joints shall be provided at
an interval of 21 M for straight run or at suitable junctions of the boundary wall. Depth of
foundation shall be minimum 1 M from the original ground level.

Two coats of decorative cement based paint over a coat of approved primer shall be provided
on the plastered surface of the walls. Two coats of synthetic enamel paint of approved make
over one coat of primer shall be provided on steel surfaces. Spacing of R.C.C. columns shall be
restricted to 3 M. Lateral load in wall/column due to earth fill shall be considered during
design.
The colony area will have 4.50 m size MS tubular gates of approved design on its wall.

10.24 RESIDENTIAL BUILDINGS :

GENERAL :

The contractor shall plan, design and construct various types of residential and other buildings
at specified Sub-stations as mentioned in the bid schedule.

The indicative outline plan drawings as attached in these documents are for bidding only. The
contractor shall, on the basis of drawing and this full specification made part of the document,
prepare detailed architectural, structural and foundation drawings and designs including all
facilities and submit to the Engineer for approval.

The contractor shall furnish front, rear and side elevations accommodating all requirements of
all types of buildings for approval of the Engineer. The contractor shall provide residential and
other buildings and furnish the indoor facilities in accordance with the requirements specified
herein and in the accompanied bid-drawings.

The residential and other buildings shall mean and include the building structure with
foundations, indoor works and facilities such as masonry and carpentry, doors, windows, water
supply and sanitary facilities, painting and all other civil works as specified for control
building. The internal electrification of buildings shall be done as per approved drawing and
specification.

Generally, design live loads shall be considered in accordance with IS:875 unless otherwise
specified.

All building structures shall be of R.C.C. frame work and R.C.C. flat roof slab generally, if not
specified otherwise.

Self weight of buildings shall be computed in accordance with IS:1911. Wind load on buildings
shall be considered in accordance with IS:875. Seismic analysis shall be done as per IS: 1893
adopting basic horizontal seismic co-efficient for the relevant zone.

Steel ladder should be installed for access to roof as necessary for utility buildings.

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 All designs and drawings shall be subjected to approval of Employer/Engineer.

No omission or ambiguities in the drawing or in the specifications will relieve the contractor
from responsibility for adequate designs and materials or completeness of the work.

10.24.01 RESIDENTIAL BUILDINGS :

The Contractor shall design and construct the following types of residential buildings as
mentioned below which may vary to suit the requirement of individual sub-station :

a) : i) 400 KV s/s Double unit with provision for double

residential building storied shall be kept.
ii) 220 KV & 132 KV s/s Each building
consisting of single unit with provision
for double storey.
b) Three storied family dormitory : Each building consisting of six units.

The foundation for C- type building at400, 220 & 132 KV sub-station shall only be designed
for future provision of construction of one additional storey.

10.24.02 SECURITY BARRACK, STORESHED :

The contractor shall design and construct two types of covered sheds of specified area as
mentioned in the bid schedule :

(a) Security barrack : Plinth area 84 Sq.m.(approx.)

(b) Store-shed with Office (400KV S/S & 220 KV) : Plinth area 300 Sq,m (approx)
(c) Store-shed with Office (132KV S/S) : Plinth area 118 Sq,m (approx)
(d)Security Goomty : Plinth area 6 Sq,m (approx)
(e) Security Office (400KV S/S) : Plinth area 23 Sq,m (approx)

The contractor shall prepare detailed architectural and structural drawings on the basis of
indicative drawings and specifications for approval of the Engineer.

Truss of required span shall be made of M.S. tubes conforming toIS:1161/1239. All structural
welding shall be conforming to IS:816.

The bay to bay distance between trusses shall be 3.6 M to 4.0 M. Ties at various level shall be
provided as required.

The trusses shall rest on R.C.C. Columns (M-20). The clear room height of the shed shall be
4.5 M from floor level.

External walls including gable ends shall be 250 mm thick brick work (4:1) plastered on both
sides (19 mm thick and 12 mm thick).

Roof sheetings shall be corrugated galvanized iron sheet 22 gauge thick and shall be fitted and
fixed with 10 mm diameter `J' or `L' hook bolts and limpet and bitumen washers etc. The roof
sheeting shall have a projection of 450 mm (min.) from the wall face.

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 The steel rolling shutter of size 3 M x 2.7 M and a collapsible gate of adequate size both
manually operated with suitable locking arrangement shall be provided as stipulated in the
concerned bid drawings.

The flooring, in general, shall be 38 mm thick grey artificial stone flooring C.C.(1:2:4) over
100 mm thick C.C. (1:3:6) and 75 mm thick brick flat soling. A layer of polythene sheet of
approved quality shall be laid over the soling before placing of concrete. The flooring of
workshop and garage shall be provided with 13 mm thick Ironite topping to be laid over 25 mm
thick C.C.(1:2:4) as per specifications stipulated in the concerned bid drawing.

The inside of the store sheds shall be finished with 3 coats of white washing and the outside
shall be finished with 2 coats of decorative cement based paint over coat of primer approved by
the Engineer.

Adequate Nos. of wooden doors, windows and ventilators shall be provided for proper lighting
and ventilation in the store sheds & office building as per approved drawing.

A toilet unit comprising of one W.C. (Orrisa type), one urinal (430 x 350 x 260 mm size) and
one wash basin (550 x 400 mm size) with water supply arrangement shall be provided in store
shed. A separate R.C. roof shall be provided over the toilet block; One no. approved quality
PVC water tank of 500 liters capacity shall be suitably accommodated over the slab including
necessary pipe connections, fitting, fixtures etc. for supply of water to toilet block. Provision of
a separate wash basin with arrangement of water supply shall also be made at a location to be
decided by the Engineer.
10.25 ANTI-TERMITE TREATMENT :
Necessary soil treatment for prevention of termite attack shall have to be undertaken by the
contractor before construction of the control room and other utility structures conforming of IS
Code No.6313 (Part II).

10.26 PLINTH FILLING

Plinth filling of Buildings including Control/Integrated Building shall be done by totally
compacting approved quality silver sand from bottom of BFS to FGL after ensuring proper
compaction of FGL.

10.27 FANS, LIGHTS AND A.C. MACHINE :

These are to be installed as per electrical specification.

10.28 WEIGHT OF SUB-STATION STRUCTURES :

Self weight of line tower, A-frame and equipment structures for different 132/33 KV and
220/132 KV 400/220KV structures shall be noted as below (These are indicative weights only.
Bidding shall have to be done in Lot.)

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 For 400 KV portion
Name of structure/equipment structure Self weight of structure in KG
1) 400 KV Tower
i) 4T1 /4T1A 7500
ii) 4T2/4T2A 8300
iii) 4T3 2400
iv) 4T4 3200
v) 4T5 2400
vi) Beam/Girder: 3200
4G1/4G2/4G3/4G4
2) Wave Trap 725
3) Isolator 3-Phase 2000
4) Pantograph Isolator 1-Phase 350
5) Bus Support /P.I. 1 275
6) CT 210
7) PT 250
8) LA 200
9) CVT 200
10) LM (47m high) 6500

For 220 KV portion

Name of structure/equipment structure Self weight of structure in KG
1) 220 KV Tower
i) 2T1 /2T1A 3600 (single 5200 (two
tier) tier)
ii) 2T2 3250 (single 4600 (two
tier) tier)
iii) 2C1 2000
iv) 2C2 1600
v) 2C3 1200
vi) Beam /Girder 1400
2) Wave 230
Trap
3) Isolator
i) 3 Phase 1100
ii) 1 Phase
4) Tandem 985
Isolator
5) Bus Support 250
6) CT 180
7) PT 190
8) LA 197
9) CVT 180
10) C.S.E 290

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 For 132 KV & 33 KV portion

Name of structure/equipment structure Self weight of structure in KG

For 132 KV For 33KV
i) Line Tower 1700 650
ii) frame in plain bus 2000 660
iii) 1150 570
iv) High level isolator 1930 800
v) Beam / truss 700 290
vi) Isolator (3 ph) 682 375
vii) LA 165 212(3 -Ph)
viii) CT 155 295(3 Ph)
ix) PT 157 320(3 Ph)
x) CVT 150 -
xi) BPI 180 340(3-Ph)
xii) BPI - 160(1 Ph)
xiii Cable Sealing Structure 180
xiii) LM 4910 -

ADDIDTIONAL WORK :

Howeve
necessary for execution for successful commissioning of the Substation is to be taken up
by the contractor.

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 BRIEF SCHEDULE OF ARCHITECTURAL FINISHES FOR
CONTROL ROOM BUILDING

1) STRUCTURE AND FOUNDATION

R.C.C. framed structure with R.C.C. foundation.

2) WALLS
a) EXTERNAL I) 250 mm thick cement brick work (1:6) in foundation & plinth.

II) 250 mm thick cement brick work (1:4) in superstructure.

b) INTERNAL I) 125 mm/75 mm thick cement brick work (1:4) & (1:3) in
superstructure.
c) 25mm thick damp proof course (D.P.C) in proportion C.C. (1:2:4) with
approved water proofing compound shall be provided in brick work at plinth
level.

3) PLASTER
a) EXTERNAL & INTERNAL I) 12/19 mm thick cement sand plaster (1:6).
b) CEILING II) 6mm thick cement sand plaster (1:4).

4) WALL FINISH AND PAINTING

a) INTERNAL WALLS & CEILING:- Two coats of plastic emulsion paint over one coat of
cement primer on plastered surface finished with 1.5mm thick white cement based wall putty
of approved make and brand.
b) EXTERNAL FACE :- On external surfaces, approved make and thickness ACP panels to
be used. Tinted glass glazing with proper fixing arrangement shall be used for good
architectural view.
c) STEEL & TIMBER SURFACE :- Two coats of synthetic enamel paint over coat of
primer.

5) FLOOR FINISH
a) Vitrified tiles flooring for all rooms including stair case and corridor, control room, PLCC and
conference room except battery room & store.
b) Artificial stone flooring with 150mm high skirting consisting of 25mm thick concrete
(1:2:4) with 6mm thick cement punning for store room only.
c) 150mmx150mmx20mm thick acid & alkali proof tiles with 1500mm high dado for battery
room only for use of Plante Battery.
Or Vitrified floor tiles for battery room for use of VRLA battery.
d) 150mmx15mmx5mm thick coloured ceramic (anti skid) tiles with 1500 mm high dado for
toilet.

6) DOORS & WINDOWS

a) ALLUMINIUM :- Alluminium framed gazed shutter of minimum 3mm thick extruded
section.
b) TIMBER:- Frame size of the door 125MM x65mm (sal wood)

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 Frame size of window 100mmx 65MM (sal wood)
Shutter 38MM thick decorative flush door.
Shuter 38MM thick with 19MM thick panel door.
c) MILD STEEL:- Rolling shutter as per specification. Collapsible gate heavy type as per
specification.
MS grill (wt 18kg/sqm) in all window opening.

7) ROOF TREATMENT
25mm thick precast tiles to be laid as per technical specification.

8) HARDWARE FOR DOORS & WINDOWS

All hardware shall be of heavy duty anodised aluminium.
Hinge: Aluminium butt hinge 100mm long
Locking system : Anodised aluminium barrel bolt 300mm long.
Handle: Anodised aluminium plate handle 300mm long.
Door ring: Anodised aluminium plate door ring 50mm dia.
Buffer block: Teak wood buffer block 125mm long .
Hydraulic door closure of approved brand as per specification.

9) SANITARY & PLUMBING

i) 580 long IPWC with low down cistern (white glazed porcelin)
ii) 430x350x260 size flat back urinal (white glazed porcelin)
iii) 600x350 size squating plate urinal (white glazed porcelin)
iv) 550x400 size wash basin (white glazed porcelin)
v) High level cast iron /PVC cistern for urinal.
vi) Mirror with shelf, aluminium tower rail, soap holder etc.
vii) All water line & fittings shall be of G.I. Pipes & stop cock, bib cock, shower rose etc.
shall be of C.P.
viii) All waste water lines & fittings shall be of H.C.I. Pipes with lead cauckled joints.
ix) All underground sewerage shall be of stoneware glazed pipes with (2:1) sand cement
joints.
x) Septic tank, circular soak pit and inspection chambers etc. shall of standard size.
xi) Overhead P.V.C. Water tank (P4 International or equivalent) of 2 nos each having 1500
litres capacity shall be provided.

10) PLINTH PROTECTION.

Generally 1000mm wide plinth protection work with C.C. (1:3:6) over single brick flat soling
finished with neat cement with peripherial drain to be provided around the control building.

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 BRIEF SCHEDULE OF ARCHITECTURAL FINISHES FOR C-TYPE QTRS,
DORMITORY
1) STRUCTURE & FOUNDATION
R C C Framed structure with R C C Foundation .

2) WALLS
a) External i) 250mm th. Cement Brick Work(1:6) in foundation & plinth.
ii) 250mm th. Cement Brick Work (1:4) in superstructures.
b) Internal i) 125/75 mm th. Cement Brick Work (1:4) & (1:3) in superstructure.
c) 25mm damp proof course (D.P.C.) in proportion C.C.(1:2:4) with approved water
proofing compound shall be provided in brick work at plinth level.

3) PLASTER
a) External & Internal : 12/19 mm th. Cement sand plaster (1:6)
b) Ceiling : 6 mm th. Cement sand plaster (1:4)

4) WALL FINISH AND PAINTING

a) Internal walls & Ceiling : Two coats of plastic emulsion paint over one coat of
cement primer on 1.5mm thick white cement based wall putty of approved make and brand
for C-type Quarters & Two coats of oil bound distemper over a coat of primer for all
rooms of Dormitory including staircase except in bath & WC.
Three coats of white washing in bath &WC of Dormitory.
b) External Walls: Two coats of protective & decorative textured 100% premium Acrylic
finish exterior paint of approved quality & of approved brand (Weather Shield/ Weather
coat / Snow crylxt ) over one coat of cement based primer.
c) Steel & Timber surface : Two coats of synthetic enamel paint over one coat of primer.

5) FLOOR FINISH.
a) 40mm thick Cast in situ coloured terrazzo work with 150mm high 25mm thick skirting
for all rooms OR
1st quality Ceramic tiles in walls & Floors with Sand Cement mortar(1:4) 20mm thick &
2mm thick cement slurry at back side of tiles using cement@2.91Kg/sqm & joint filling using
white cement slurry 0.2kg/sqm
b) 150mmx150mmx5mm thick coloured glazed porcelain tiles for toilet with 2100mm high
dado.

6) DOORS
a) Paneled Door :- Frame size of door--- 125x65 {sal wood}, Shutter--38mm thick styles
& rails and 19mm thick panel {Gamari}
b) Decorative Flush Door :- Frame size of door--- 125x65 {sal wood} & 38mm thick
Gamari wood batten.

7) WINDOWS
a) Generally 2/3rd paneled 1/3rd glazed windows with M.S. Grill (18kg/sqm) and frame size
125x65 {sal wood) with 38mm thick wood style & rails with 19mm th. wooden panel of
GAMARI wood.
b) Fully glazed shutter for staircase.
c) Fully glazed with frosted pin head in bath & w/c.

8) BUILT IN CUPBOARD

WBSETCL Page - 86/88 Sub-station Civil Tech. Specs

 a) Built in cupboard of size 1200x500x2100 high with three R.C. shelves & bored & white ant
proof block board flush shutter with locking arrangement in each bed room /living room .
b) Built in cupboard of size 750x500x2100 high with three R.C. shelves with fly proof net
fitted on Gamari shutters in kitchen.
c) Frame work for both a) & b) would be of salwood.

9) ROOF : Pre Cast concrete roof tiles over skid conc. & resin bonded painting for all buildings.

10) HARDWARE FOR DOORS & WINDOWS:

All hardware shall be of heavy duty anodized Aluminium.
HINGES : Aluminium Butt hinges 100mm long.
LOCKING SYSTEM: Anodised Aluminium Hasp bolt 300mm long
HANDEL: Anodised Aluminium plate Handel 150mm long
DOOR RING : Anodised Aluminium plate door ring 50mm dia.
BUFFER BLOCK : 125mm long Buffer block.
DOOR STOPPER :-To be provided as per PWD schedule.

11) SANITARY & PLUMBING

C-type Dormitory
(per unit) (per unit)
i) 580 long I.P.W.C. with low down cistern (P.V.C.) 1 1
ii) 550x400 size Wash Basin ( white glazed porcelain) 1 1
iii) Mirror with shelf, Aluminum Towel Rail, Soap holder
shower rose etc. as per requirement. 1 1
iv) Stainless steel sink size 600x450x250 in kitchen 1 1

vii) All water line & fittings shall be of G.I. pipes & stop cock, bib cock, shower rose etc.
shall be of C.P. (nos. shall be as per requirement).
viii) All soil waste drain pipes & fittings etc. for over ground shall be of extra heavy duty cast
iron pipes of approved quality and for underground shall be of heavy duty storm water pipes
of approved quality.
ix) Septic tank & circular soak pit, inspection chamber etc. shall be of standard size for each
building.
x) Overhead P.V.C. water tank (P4 International or equivalent) for each wing of the two
wings of Dormitory & C-type Bldg. C-Type-500 ltr. & Dormitory- 1500 ltr.

12) ELECTRICAL INSTALLATION:-

Sl no Item C-type Bldg. (per unit) Dormitory (per unit)
i) Fan points 4 2
ii) Light Points 10 6
iii) Light/Power Plug 7 4
(However nos. of fans, light & power plug points are to be reaffirmed from electrical
specification)

13) PLINTH PROTECTION:

Generally 1000mm wide plinth protection work with C.C. (1:3:6 ) over one layer of B.F.S. with
peripheral drain to be provided around each Building finished with neat cement.

WBSETCL Page - 87/88 Sub-station Civil Tech. Specs

 BRIEF SCHEDULE OF ARCHITECTURAL FINISHES FOR STORE SHED
CUM OFFICE

WALL FINISH
1) Three coats of white washing on finished internal plastered surface. Outside wall shall be
finished with 2 coats of decorative cement based paint approved by the Engineer.

FLOOR FINISH
1) Artificial stone flooring with 150mm high skirting consisting of 38 mm thick concrete (1:2:4)
including 16 mm thk. Neat cement punning for all floors except garage & store.
2) For store 13 mm thk. ironite topping to be laid over 25 mm thk. c.c (1:2:4) while the later is still
green. Ratio of ironite dust to cement shall be 1:4 by weight and the ratio of mixing of this mix
with 6 mm nominal size stone chips shall be 1:2 by volume. The topping layer shall be pressed
firmly and finished with steel trowel.

DOORS
1) Rolling shutters of heavy type (as per specification & approved drawing).
2) Collapsible grill gate of heavy type (as per specification & approved drawing).

ROOF
1) G.C.I. sheet of 22 gauge fitted by J or L hook with M.S. tubular truss & wind tie as per
approved design.
2) Intermediate R.C.C. slab over toilet block.

FALSE CEILING
1) False ceiling to be provided in office portion of store with 6 mm thick commercial ply ( borer &
white ant proof) in panels fixed on Sal wood runner(75mmx50mm size) and beam of the panel
junction with suitable fixing arrangement.

SANITARY & PLUMBING FITTINGS

1) Flat back urinals (white glazed porcelain) 430 x 350 x 250 size with low level PVC cisterns
(500 long).
2) Wash basin of white glazed porcelain of 550 x 400 size.
3) Mirror with shelf, chromium plated towel rail, liquid soap holder & stainless steel shower rose.
4) Overhead PVC water tank (P4 International or equivalent) of approved quality & 500 ltr.
capacity shall be provided over the slab of toilet block.
(All other schedule of architectural finishes would be as in the case of residential buildings as
applicable)

PLINTH PROTECTION:
Generally 1000mm wide plinth protection work with C.C. (1:3:6 ) over one layer of B.F.S. with
peripheral drain to be provided around each Building finished with neat cement.

ELECTRICAL INSTALLATION
As approved by the electrical wing.

WBSETCL Page - 88/88 Sub-station Civil Tech. Specs