Contents

1. Scope ....................................................................................................................................... 2
2. List of Standards ...................................................................................................................... 2
3. Terminology ............................................................................................................................. 3
4. Materials .................................................................................................................................. 3
5. Submittals ................................................................................................................................ 4
7. Workmanship - Fabrication ..................................................................................................... 5
6. Quality Management: ............................................................................................................ 13
7. Safety Management .............................................................................................................. 15
9. Environmental Management................................................................................................. 15
10. Completion & Delivery ....................................................................................................... 16
11. Method of Measurement .................................................................................................. 16
12. Annexures: Nil ................................................................................................................ 16
 Technical Specifications for Structural Steel Work
1. Scope
This specification applies to fabrication, erection and placing of structural steel in main
load-bearing elements of a building. This does not cover fabrication and installation of
steel in sundry work such as railings, gratings, architectural features

2. List of Standards
All work shall be carried out as per the latest version of relevant Indian Standards. The
list of IS standards given hereunder is not to be considered as conclusive and is for
reference and guidance only. Any discrepancies /conflict noticed shall be directed to the
Engineer for his direction/approval. However as a general rule more stringent
specification shall take precedence

IS Code
S.N. Title
No.
Code of Practice for use of structural steel in general
1 IS: 800
building construction
Code of Practice for use of steel tubes in general building
2 IS 806
construction.

3 IS 808 Dimension for hot rolled steel sections.

4 IS 813 Scheme of symbols for welding

Covered electrodes for metal arc welding of (Part I & II)

5 IS 814
structural steel.
Code of practice for use of metal arc welding and general
6 IS 816
construction in mild steel.

7 IS 822 Code of Practice for inspection of welds.

8 IS 1161 Steel tubes for structural purposes.

Recommended practice for Radiographic examination of

9 IS 1182
fusion welded butt joints in steel plates
Rolling and cutting tolerances for hot rolled steel
10 IS 1852
products.

11 IS 2062 Hot Rolled Low, Medium and High Tensile Structural Steel

12 IS 2595 Code of practice for Radiographic testing.

 Code of practice for testing of fusion-welded (Part-I)
13 IS 3600
joints and weld metal in steel

14 IS 4923 Hollow steel sections for structural use.

Code of practice for magnetic particle flaw detection of

15 IS 5334
welds.
Code of practice for use of metal arc welding in tubular
16 IS 6227
structure.

17 IS 7215 Tolerances for fabrication of steel structures.

Method of measurement in Building Civil Engineering

18 IS 12000
work.

3. Terminology
The following terms and abbreviations shall have the specific meanings as described
hereunder. For terms that are not described herein, the definitions as stated in the
applicable Indian Standard Specifications shall apply
3.1. Fabrication: as an industrial term refers to building a metal structure by cutting,
bending, joining and assembling of steel elements.
3.2. Shop Drawing: is a drawing or set of drawings produced by
the contractor, supplier, manufacturer, subcontractor, or fabricator. Shop drawings
are typically required for prefabricated components.
3.3. Joist: is one of the horizontal supporting members that run from wall to wall, wall
to beam, or beam to beam to support a ceiling, roof, or floor.
3.4. Camber: an upward curvature of a joist to compensate for load-deflection due in
buildings.
3.5. Welding: a fabrication process that joins materials, usually metals by fusing them
at high temperature.

4. Materials
4.1. Structural Steel: Structural steel used in the works shall be either of the following
types : -
4.1.1. Mild steel conforming to IS 2062: 2006 - Hot Rolled Low, Medium and High
Tensile Structural Steel
4.1.2. All steel tubes shall be hot finished seamless steel tubes (HFS) or cold drawn
seamless (CDS) of the specified strength and as approved by the Engineer and
shall conform to IS: 1161.
4.2. Threaded Fasteners: All bolts and nuts shall be delivered as per technical conditions
specified in IS: 1367.
4.3. Black bolts, nuts and screws shall be In accordance with IS: 1363.
4.4. Wherever countersunk screws are specified, they shall be precision grade, slotted,
countersunk head, machine screws conforming to type ‘R’ of IS : 1364.
 4.5. Wherever high tensile special quality bolts and nuts are specified, they shall comply
with provision of IS: 3757 and IS: 800.
4.6. Coach screws shall be in accordance with IS: 1120 and wood screws shall conform
IS: 451.
4.7. All plain washers shall conform to requirements of IS: 2016.
4.8. Wherever spring washers for bolts, nuts and screws are specified, they shall be in
accordance with the provisions of IS: 3003.
4.9. Cast Iron: Cast iron shall conform to IS: 210. All cast iron goods shall be of the best
quality and make and as approved by the Engineer.
4.10. Cast steel shall conform to IS: 1030. Unless specified otherwise, the steel shall be
grade 2 and shall cater for all tests specified in the said standard.
4.11. Rails for the cranes shall comply with the requirements of IRST-12-64 or IS: 3443
if so instructed by the Engineer. They shall be obtained from an approved
manufacturer.
4.12. Electrodes: Electrodes used for metal arc welding of mild steel shall be heavy-
coated type electrodes conforming to IS: 814 (Part l & II) and shall be of best quality
approved by the Engineer.
4.13. Handling and Storage: Structural steel shall not be stored in mud and dirt and
proper drainage of the storage area shall be provided. The steel shall be protected
from damage or from being spoilt by adjacent construction operations.
4.14. Fabricated steel shall not be handled until the paint has thoroughly dried. Care
shall be taken to avoid paint abrasions and other damages. Steelwork shall be
transported in the largest practical lengths and in such a way as not to overstress
the fabricated sections.
4.15. All pieces bent or otherwise damaged shall be replaced by the Contractor at his
own cost.
4.16. Storage of fabricated steel at the job site shall be the responsibility of the
Contractor. Material shall be stored at the Job Site in a manner which does not
overload the existing or newly constructed structures. Materials shall be protected
against excessive deflection, corrosion or deterioration.
4.17. As far as practicable, stacking of fabricated steel shall be done in sequence of
erection, but heavy members shall not be stacked on top of the light ones.

5. Submittals
5.1. Prior to start of delivery of structural steel, the Contractor shall submit the
following to the Engineer for review.
5.1.1. Certified copies of mill test reports including chemical analysis and physical
properties as required by the applicable Indian Standards for each consignment
of steel.
5.1.2. Where such mill certificates are not available the Contractor shall employ an
approved testing laboratory to perform the required tests and chemical analysis
at his own cost.
5.2. Before commencement of any structural steel fabrication work, the Contractor shall
submit the following to the Engineer for his approval:
 5.2.1. Fabrication drawings including details of connections.
5.2.2. Assembly, erection and installation drawings and manuals indicating the
sequence of work, welding and bolting procedure to be used. Cambers for
trusses and large span girders shall be shown.
5.2.3. Painting details and Galvanising if specified by the owner in the drawing.
5.2.4. For composite construction, the details and calculation of details and calculation
of falsework and forms supporting the concrete work in steel structure shall be
submitted.
5.2.5. The drawings prepared by the Contractor and all subsequent revisions etc. shall
be at the cost of Contractor for which no separate payment will be made.

6. Workmanship - Fabrication
6.1. Shop Drawings:
6.1.1. The Contractor shall prepare required detailed shop drawings giving complete
information necessary for the fabrication of the structure. All information should be
clearly given and the drawings shall be in conformity with best modern practices. A
marking diagram allotting distinct identification marks to each separate piece of
steelwork shall be prepared in sufficient detail to ensure convenient assembly and
erection. Symbols used for welding in the drawings shall be in accordance with IS:
813.
6.1.2. The Contractors shall prepare comprehensive details of material sheets for each shop
drawings giving therein all the items shown on the drawings together with their
weights, marks, numbers, cutting lengths etc. Three copies of all working drawing and
bill of material sheets shall be submitted to the Engineer for approval.
6.1.3. Fabrication shall not commence until the approval of the relevant drawings has been
obtained from the Engineer. While the shop drawings prepared by the Contractor
and approved by the Engineer are deemed to represent the correct interpretation of
the work to be done, the Contractor is not relieved of the responsibility for accuracy
of detailed dimensions shown thereon.
6.1.4. The Contractor shall not commence detailing unless design drawings are officially
released for preparation of shop drawings. The Contractor shall be responsible for
the correctness of all fabrication drawings. Fabrication drawings shall be revised by
the Contractor to reflect all revisions in design drawings as and when such revisions
are made by the Engineer.
6.1.5. No fabrication drawings will be accepted for OWNER’S approval unless checked and
approved by the Contractor's qualified structural engineer and accompanied by an
erection plan showing the location of all pieces detailed.
6.1.6. The Contractor shall ensure that connections are detailed to obtain ease in the
erection of structures and in making field connections.
6.1.7. The shop drawings prepared by the Contractor and all subsequent revisions etc. shall
be at the cost of the Contractor for which no separate payment will be made.
6.1.8. Templates: All fabrication shall be carried out in accordance with IS: 800. Extensive
use of templates shall be made. The templates shall be steel bushed where
considered necessary by the Engineer.
6.1.9. In case actual members are used as templates for similar pieces, it will be at the
discretion of the Engineer to decide whether such pieces are fit to be incorporated in
the finished structure.
6.1.10. The Contractor shall arrange for corresponding part of each unit manufactured
from the same drawings to be interchangeable as far as economic manufacturing
conditions permit, and shall advice the Engineer of the precise arrangement made in
this respect, but prior approval of a gas torch, but prior approval of the Owner or
Owner’s Authorised Representative, in writing, should be taken.
6.2. Cutting:
6.2.1. Gas Cutting shall normally be permitted for mild steel only. Gas cutting of high tensile
steel may be permitted provided special care is taken to leave sufficient metal to be
removed by machining so that metal hardened by flame is removed. Gas cutting shall
preferably be done by machine; Hand flame cutting may only be permitted subject to
the approval of the Owner or Owner’s Authorised Representative. Gas cut edges shall
be free of gouge. Any gouges that remain after cutting shall be removed by grinding.
6.2.2. Rolled sections shall be sawn or flame cut to length. Small plate pieces like gussets
may be sheathed or chopped to size. Sawing, shearing and chopping shall be clean
and free from any distortion. If necessary the edges shall be ground afterwards.
6.2.3. For tubular construction, cutting of the pipe and preparation of joint surface shall be
done in a neat manner for a good fit-up. The ends of the tubes may be flattened or
otherwise framed for connections, provided that the methods adopted for such
flattening do not injure the material. The change of section shall be gradual.
6.3. Straightening: All materials shall be straight unless required to be of curvilinear form
and shall be free from twists. If necessary the materials shall be straightened and/or
flattened by pressure. Heating of rolled sections and plates for purpose of straightening
will not be permitted. Limited straightening may however be effected by local
application of heat with
6.4. Drilling
6.4.1. Holes shall preferable be done by drilling. Punching shall not be restored to unless
previously approved by the Owner or Owner’s Authorised Representative. In any
case, punching of holes in materials having a thickness in excess of the connector
diameter or in the materials thicker than 16mm shall not be permitted. Where
punching is permitted the holes shall be punched 3 mm less in diameter than the
required size and reamed after assembly to the full size.
6.4.2. Holes shall be drilled or punched at right angles to the surface of the member, not
more than 1.5 mm/2.0 mm (as the case may be depending upon whether the
connector diameter Is less than or more than 25 mm) larger than the connector
diameter. Holes shall not be formed or enlarged by burning or gas cutting. Holes shall
be clean-cut without torn or ragged edges. Outside burrs resulting from drilling
operations shall be removed.
6.4.3. Holes through more than one thickness of material of members such as compound
stanchions and girder flanges shall be drilled after the members are assembled and
tightly clamped or bolted together. They shall then be separated and burrs removed
if so directed by the Owner or Owner’s Authorised Representative.
6.4.4. Steel member’s adjustment shall be provided with slotted holes as shown in the
drawings. Suitable templates shall be used for the proper location of the holes.
6.5. Fabrication Tolerances: Cutting, punching, drilling, welding and fabrication tolerances
shall be generally as per relevant IS codes.
6.5.1. Unless otherwise shown on the drawings, the fabricating tolerances shall generally be
as follows:
a. Compression members shall not deviate from straightness by more than 1/ 1000
of the axial length between points which are to be laterally supported.
b. A variation of 1 mm is permissible in the overall length of members with both
ends finished for contact bearing.
c. Members without ends finished for contact bearing which are to be framed
together in parts of the structure, may have a variation from the detailed length
not greater than 2mm for members 10 metres or less in length and not greater
than 3 mm for members over 10 metres in length.
6.6. Assembly:
6.6.1. All connections shall be either bolted or welded as shown in the drawings.
Contractor shall not redesign or alter any connection without prior approval of the
Engineer.
6.6.2. The component parts shall be assembled in such a manner that they are neither
twisted nor otherwise damaged and shall be prepared so that the specified camber if
any is provided. Drifting done during assembly shall not distort the metal or enlarge
the holes. Poor matching of holes shall be cause for rejection. However if permitted
by the Owner or Owner’s Authorised Representative holes that must be enlarged due
to mismatch, shall be reamed.
6.7. Bolting:
6.7.1. All steelwork which is bolted together shall be in close contact over the whole
surface. Where two bolted surfaces are to be in permanent contact after assembly,
each shall be thoroughly scraped free of loose scales, dirt and burrs and a heavy coat
of red oxide, zinc chrome or other approved paint applied after cleaning and drying.
6.7.2. All bolts shall be provided with washers under the nut tapered on the inside of the
flanges of R.S. Joists and channels. Bolts and studs shall project not less than one full
thread through the nut after tightening. Unless otherwise specified, the ends of the
bolts shall be enlarged by hammering after erection to prevent the removal of nuts.
6.7.3. High strength bolts shall be used in bearing or friction as shown in the drawings.
6.7.4. High strength bolted joints shall be made without the use of erection bolts. Bolts shall
be of a length that will extend not less than 6 mm, or three times the pitch of the
thread whichever is higher, beyond the nuts. Bolts shall be entered into holes
without damaging the threads. Members shall be brought tightly together with
sufficient high-strength fitting up bolts which shall be retightened as all the bolts are
finally tightened. Bolt-heads shall be protected from damage during placing. Bolts
that have been completely tightened shall be marked for identification. Bolted parts
shall fit solidly together and shall not be separated by interposed compressible
materials. The contact surface in high strength bolted connections shall be free of oil,
paints, lacquer, loose scale or other coatings. The facing surfaces shall be machined
 flat. Final tightening of high strength bolts shall be by turn-of-nut method.
Retightening shall not be permitted. Whenever the Contractor intends to use other
means of tightening he shall obtain prior approval of the Owner or Owner’s
Authorised Representative.
6.7.5. In case of high strength friction grip bolts, hardened washers shall be used under the
nuts or the bolt heads, whichever are turned to tighten the bolts.
6.7.6. Anchor bolts shall be set by use of templates secured firmly in place to permit true
positioning of the bearing plates and assemblies. When in drawings anchor bolts are
shown to be installed in sleeves, the sleeves shall be completely filled with grout.
6.8. Welding:
6.8.1. Welding shall be done in accordance with IS: 816. Welding procedures shall be based
on the specific analysis of any given heat of steel (based on the certified mill test
reports) and shall be subject to the review of the Engineer. These procedures shall
call for one or all of the following
a. Proper bead shape.
b. Minimized penetration to prevent dilution of the weld metal with the alloy
elements.
c. Preheating controlled inter pass temperature and controlled heat input.
6.8.2.
6.8.3. Welding shall be performed only by qualified and tested welders specifically trained
and experienced for the type of job required to execute the welding work to the
complete satisfaction of the Owner or Owner’s Authorised Representative. However
periodical testing of welders shall be done as per IS 817, IS 7310 (Part I) and IS 738
(Part I).
6.8.4. Use of standard weld symbols as adopted by IS: 813 is mandatory. Pre-qualified joints
which are detailed, prepared and welded in accordance with the requirement of IS:
816 shall be invariably used.
6.8.5. Structural welding shall not commence until joint elements are bolted or tacked in
intimate contact and adjusted to dimensions shown with allowance for any weld
shrinkage that is expected. Welding sequence shall be planned and controlled to
avoid undue stress Increase or undue distortions in restrained members. Heavy
sections and those having a high degree of restraint shall be welded with low
hydrogen type electrodes.
6.8.6. If copper wire spacers are used between two surfaces to be welded to reduce
transverse stresses in the weld, care shall be taken that it does not mix with the weld
metal.
6.8.7. Concave bead shape shall be avoided. The ratio of weld width to weld depth shall
preferably vary from a minimum of 1 to 1, to a maximum of 1.4 to 1.
a. Width-of-weld
b. ——————— = 1 to 1.4
c. Depth of fusion
6.8.8. Field welding shall not be permitted unless shown on the drawings.
6.8.9. Subsequent to fabrication, the overlapping or contacting surfaces, or other closed
sections (such as tubular, box section) which are inaccessible to painting shall be seal
 welded. When the end of the tube is not automatically sealed by virtue of its
connection by welding to another member the end shall be properly and completely
sealed. Before sealing, the inside of the tube shall be made dry and free from loose
scale.
6.8.10. Order of assembly of the tubular sections shall consist of welding the tensile
member to the main member first. Compression members shall be cut back to
overlap the tensile member and then welded to both of these members.
6.8.11. No welding shall be done when the surface of the member is wet nor during
periods of high wind. No welding shall be done on base metal at a temperature below
5oC. The base metal shall be preheated to the temperature as per relevant IS codes.
6.8.12. Each layer of multiple layer welds except root and surface runs may be
moderately peened with light blows from the blunt tool. Due care should be
taken to prevent scaling or flaking of weld and base metal from over peening.
6.8.13. Electrodes other than low-hydrogen electrodes shall not be permitted for
thicknesses of 32 mm and above.
6.9. Shop assembly:
6.9.1. Steelwork shall be temporarily shop erected completely or partially as directed by
the Owner or Owner’s Authorised Representatives so that the accuracy of fit may be
checked before dispatch. Due notice shall be given to the Owner or Owner’s
Authorised Representative so that the accuracy of fit may be checked before
dispatch. Due notice shall be given to the Owner or Owner’s Authorised
Representative when the work is ready for inspection and the assembly shall not be
dismantled until it has been inspected and approved by the Owner or Owner’s
Authorized Representative.
6.9.2. The parts shall be assembled with a sufficient number of parallel drifts to bring and
keep the components in place. In the case of parts drilled or punched through steel
jigs resulting in similar parts being interchangeable for a portion of the steelwork,
the trial assembly shall be carried out to the extent required by IS: 1915.
6.9.3. All erection marks shall be die-stamped and also distinctly stencilled in the paint.
The marking shall be as per the marking diagram approved by the Owner or Owner’s
Authorised Representative.

6.10. Erection:
6.10.1. As far as possible, the Contractor shall deliver the fabricated steelwork to the site
in the same sequence as that which he wishes to follow for the erection. Dispatch
should be scheduled to avoid cluttering up of the site. The bolts required for
erection shall be bagged according to size prior to dispatch.
6.10.2. All structural work shall be erected in accordance with IS: 800/IS: 806 and as per
the approved erection drawings. The Contractor shall be responsible for setting out
the works. The suitability and capacity of all plant and equipment used for erection
shall be to the satisfaction of the Engineer. These equipment shall be regularly
serviced and maintained. Occupational safety practices shall be strictly adhered to
and shall be to the satisfaction of the Owner or Owner’s Authorised Representative.
6.10.3. Individual pieces shall be plumbed, levelled and aligned. Drift pins may be used only
to bring together the several parts. They shall not be used in such manner as to
distort or damage the metal. Temporary bracing, guy line and staging shall be
provided to ensure proper alignment and to adequately protect all people’s
property and to withstand all loadings to which the structure may be subjected
during erection.
6.10.4. Attachment of such temporary steelwork to the permanent steelwork shall only be
done with the approval of the Owner or Owner’s Authorised Representative.
Temporary steelwork shall remain in position until the structure is stable and self-
supporting and permanently bolted or welded to the satisfaction of the Owner or
Owner’s Authorised Representative. After removal of temporary steelwork, the
permanent structure shall be made good to the complete satisfaction of the Owner
or Owner’s Authorised Representative.
6.10.5. No permanent bolting or welding shall be done until proper alignment has been
obtained. Erection of the parts with any moderate amount of reaming, chipping
or cutting shall be immediately reported to the Owner or Owner’s Authorised
Representative. The steelwork shall be rejected unless corrective action is approved
by the Owner or Owner’s Authorised Representative.
6.10.6. No erection shall be permitted more than 2 storeys above a complete bolted
and/or welded floor or above a decked surface.
6.10.7. Placement of joists shall not start until the supporting work is secured. Temporary
bracing, connections and anchors shall be provided to ensure lateral stability during
erection. Bracing to steel joists shall be installed immediately after joist erection,
before any construction loads are applied. Horizontal or vertical bracing shall be
provided in accordance with the drawing or type / span of the joists. Alternatively
ends of the bracing lines shall be anchored at node point that is laterally
restrained either by wall or by elevational bracing.

6.11. Erection Tolerances:

Columns
1.1 Deviation of column axes at
foundation top level with respect to true axes
In longitudinal direction ± 5 mm
In lateral direction ± 5 mm
1.2 Deviation in the level of bearing ± 5 mm
surface of columns at foundation top with
respect to the true level
1.3 Out of plumb (verticality) of column
axis from a true vertical axis, as measured at
column top :
For columns up to and including 15 metres in ± 1/1000 of column height in
height mm or ±15mm whichever is less
For columns exceeding 15 metres in height ± 1/1000 of column height in
 mm or ± 20 mm whichever is
less
1.4 Deviation in straightness in ± 1/1000 of column height in:
longitudinal and transverse planes of the mm or ± 10 mm whichever is
column at any point along with the height less
1.5 Difference in the erected position of ± 10 mm
adjacent pairs of columns along the length or
across the width of building prior to
connecting trusses/beams with respect to true
distance
1.6 Deviation in any bearing or seating ± 5 mm
level with respect to true level
1.7 Deviation in differences in bearing ± 10 mm
levels of a member on adjacent pair of
columns both across and along with the
building
2.0 Trusses And Beams
2.1 Shift at the centre of the span of top ± 1/250 of the height of truss in
chord member with respect to the vertical mm or ± 15 mm whichever is less
plane passing through the centre of the
bottom chord
2.2 Lateral shift of top chord of truss at ± 1/1500 of span of truss in mm
the centre of span from the vertical plane or ± 15 mm whichever is less
passing through the centre of supports of the
truss
2.3 Lateral shift in the location of truss ± 10 mm
from its true vertical position
2.4 Lateral shift in the location of purlin ± 5 mm
true position
2.5 Deviation indifference of bearing ±20 mm for trusses
levels of trusses or beams from the true
difference
ii) For beams with:
Depth < 1800mm ±6mm
Depth > 1800mm ±10 mm
2.6 Deviation in sag in chords and 1/1500 of length in mm or 10mm
diagonals of a truss between node points whichever is smaller
2.7 Deviation in a sweep of trusses, 1/1000 of span in mm subject to a
beams etc. in the horizontal plane maximum of 10 mm
3.0 Crane Girders & Rails
3.1 Shift in the centre line of crane rail ± 5 mm
with respect to the centre line of the web of
crane girder
3.2 Shift in plan of alignment of crane rail ± 5 mm
with respect to true axis of crane rail at any
point
3.3 Difference in the alignment of crane ± 1 mm
rail in plan measured between any two
points 2 metres apart along the rail
3.4 Deviation in crane track with respect
to track gauge
For track gauges up to and including 15 ± 5 mm
metres
For track gauges more than 15 metres ± [5 + 0.25 (S-15)] where S in
metres is a true to gauge
3.5 Deviation in the crane rail level at any 1/1200 of the gauge distance or ±
point from true level 10mm whichever is less
3.6 Difference in the crane rail actual ± 2 mm
levels between any two points 2 metres
apart along the rail length
3.7 Difference in levels between crane
track rails at
Supports of crane girders ± 15 mm
Midspan of crane girders ± 20 mm
3.8 Relative shift of crane rail surfaces at 2 mm subject to grinding of
a joint in plan and elevation surfaces for a smooth transition
3.9 Relative shift in the location of crane 1/1000 of track gauge S in mm
stops (end buffers) along the crane tracks subject to a maximum of 20 mm
with track gauge S in mm

4.0 Chimneys And Towers

4.1 Out of plumb (verticality) from the 1/1000 of the height of the
true vertical axis chimney or tower in mm
5.0 Bunkers

5.1 Deviation in length of the bunker ± 1/1000 of length in mm

from the true length
5.2 Deviation in width of the bunker ± 1/1000 of width in mm
from true width
Deviation in height of bunker from true ± 1/500 of height in mm
height
Deviation in diagonal length in any ± 1/500 of diagonal length in mm
horizontal cross-section from the true
diagonal length
6.12. Field Modifications: Correction to accommodate minor misfits in steel structure by
moderate use of drift pins and reaming will be permitted. Errors that cannot be
corrected by these measures and require modifications, must be reported
immediately to the Owner or Owner’s Authorised Representative along with the
Contractor’s proposed solution.

6.13. Grouting under base plates:

6.13.1. Grouting under base plates shall be done after the erection of the structural steel
unless otherwise approved by the Owner or Owner’s Authorised Representative. All
bearing plates, bearing assemblies and masonry plates shall be set level and to the
elevations shown on plans. These shall be shimmed with approved means and
grouted to assure full bearing on the supporting substrata regardless of the
tolerances otherwise permitted.
6.13.2. The grout to be used in superstructure stanchion bases shall be cement mortar
1: 2 (1 cement: 2 coarse sand), mixed with non-shrink admixture and shall have a 28
days’ compressive strength of at least 30MPa. Surfaces which are to receive the
grout shall be thoroughly cleaned immediately prior to the grouting operation. The
grout shall be carefully worked under the base plates and shall completely fill the
space under the base plates. Air pockets in the grout packing shall be avoided.
6.13.3. After the grout has had its initial set, the grout shall be cut back flush with the base
plate and the surplus grout shall be removed. Before leaving the site, the Contractor
shall retighten the nuts of all anchor bolts.

6.14. Cleaning and paint touch up: After erection, exposed surfaces of field connections,
unpainted areas adjacent to tie connections and damaged area of the shop coat
shall be cleaned to the same standards required as the shop coat. These shall then
be painted with the same paint used in the shop coat.
6.15. Inserts and Embedment: Various steel inserts and embedment are required under
the Contract to be fabricated, positioned and secured firmly into place inside the
formwork prior to concrete being poured. There are also requirements of jointing,
threading, bolting and welding inserts and embedment of structural steel elements
in order to establish structural continuity and connection. Great care shall be
exercised by the Contractor in executing all aspects of the work related to inserts
and embedment, including tolerances so that the final assembly of the concrete
elements can meet satisfactorily the continuity and contiguity requirements
intended in the structure.

7. Quality Management
The contractor shall put in place a comprehensive quality management plan to ensure
that the work is carried out as per specifications and compliance to all requirements are
established and demonstrated through comprehensive documentation. The contractor
shall engage a qualified Quality Manager to implement the quality plan. Till such time a
Quality Management Plan and ITP is approved, the following provisions shall apply
7.1 The Contractor shall give due notice to the Engineer in advance of the materials
Or workmanship getting ready for inspection.
7.1.1 All rejected material shall be promptly removed from the shop and replaced with
new material for the Engineer’s approval/inspection.
7.1.2 The fact that certain material has been accepted at the Contractor’s shop shall
not invalidate final rejection at the site by the Engineer if it fails to be in the
proper condition or has fabrication inaccuracies which prevent proper assembly.
7.1.3 No materials shall be painted or despatched to site without inspection and
approval by the Engineer unless such inspection is waived in writing by the
Engineer.
7.1.4 Shop inspection by the Engineer or submission of test certificates and
acceptance thereof by the Engineer shall not relieve the Contractor from the
responsibility of furnishing material conforming to the requirements of these
specifications, nor shall it invalidate any claim which the Engineer may make
because of defective or unsatisfactory material and/or workmanship.
7.1.5 The Contractor shall provide all the testing and inspection services and facilities
for shop work except where otherwise specified.
7.1.6 For fabrication work carried out in the field the same standard of supervision
and quality control shall be maintained as in shop fabricated work. Inspection
and testing shall be conducted in a manner satisfactory to the Engineer.
7.1.7 Qualified welders shall only be deployed for the work and welder’s qualification
tests shall be performed.
7.1.8 If mill test reports are not available for any steel materials the same shall be got
tested by the Contractor to the Engineer’s satisfaction to demonstrate
conformity with the relevant specification.
7.1.9 All fillet welds shall be tested either by Die penetration test of Magnetic particle
test.
7.1.10 If heat treatment is performed, the completed weld shall be examined after heat
treatment. All defects shall be repaired and retested.
7.1.11 All full strength butt welds shall be radiographed in accordance with the
recommended practice from radiographic testing as per relevant IS codes.
7.1.12 In the event of failure of any member to satisfy inspection or test requirement,
the Contractor shall notify the same to the Engineer. The Contractor shall obtain
permission from the Engineer before commencing any repairing work. The
quality control procedures to be followed are to ensure that satisfactory repairs
are carried out subject to the approval of the Engineer
7.1.13 The Contractor shall maintain records of all inspection and testing which shall be
made available to the Owner or Owner’s Authorised Representative as and when
demanded.
7.2 Tolerances: The dimensional and weight tolerances for rolled shapes shall be in
accordance with I.S. 1852 for indigenous steel and equivalent applicable codes for
imported steel. The tolerance for the fabrication of structural steel shall be as per IS
7215.
 7.3 End milling: Where compression joints are specified to be designed forbearing, the
bearing surfaces shall be milled true and square to ensure proper bearing and
alignment.

8. Safety Management
Apart from general safety and health hazards like working at heights, falling objects etc.,
the contractor shall assess the hazards associated with concrete works and shall take
specific action to mitigate against the same. This shall be achieved by the development
of a Safety management manual. The manual shall be built around a Hazard
Identification Risk Analysis and Control matrix [HIRAC] and control measures based on
the same. Some of the hazards associates with steelworks is listed for general guidance
below:
8.1 All hazards associated with working with Electricity / electrical equipment
8.2 All hazards working with industrial gasses & related fire hazards
8.3 Flying sparks, metal chips or pieces
8.4 Till such time a Safety manual / HIRAC is developed and control measures
implemented, the following provisions shall apply.
8.5 Contractor shall maintain first aid facilities at the site. All workmen must wear
Helmets, Safety belts, shoes etc. All required precautions including medical check-up
shall be taken for working at heights.
8.6 All critical industrial injuries shall be reported promptly to Engineer and a copy of
the contractor’s report covering each personal injury requiring the attention of a
physician shall be furnished to Engineer.
8.7 The contractor shall provide, and maintain barricades, guards, guard rails, temporary
bridges and walkways, watchmen, night illuminations and danger signals illuminated
from sunset to sunrise, and all other necessary appliances and safeguards to protect
the work, life property, equipment and materials. Barricades shall be of substantial
construction and shall be painted such as to increase their visibility at night.
8.8 Notwithstanding any stipulations by Engineer, the contractor shall be solely
responsible for initiating maintaining and supervising all safety precautions and
programs in connection with the work, and shall comply with all laws, ordinances,
codes, rules, regulations and lawful orders of any public authority having jurisdiction
for the safety of persons or property or to protect them from damages, injury or loss
during the entire contract period including non-working hours.
8.9 The contractor shall perform any and all operations and shall furnish any materials
and equipment necessary during an emergency endangering life or property without
waiting for Engineer’s instructions and, in all such cases, shall notify, the ENGINEER
of the emergency as soon as practicable.

9. Environmental Management
Apart from the general environmental impact of construction activities, the contractor
shall assess the environmental impact associated with rebar works and shall take
 specific action to mitigate against the same. Some of the environmental aspects
associates with rebar works are listed for general guidance below.

10.Completion & Delivery

Work-related to rebar construction shall not be deemed to be complete until such time
all the following conditions are fulfilled:
10.1 There are no defects in the fabricated elements or all defects have been rectified
to the satisfaction of the Engineer.
10.2 All structural elements are erected and to the permissible tolerance and touch
up paint is applied at all required locations.
10.3 Any cladding that is supported by the steelwork is installed
10.4 All quality documents/test certificates are compiled and submitted.

11.Method of Measurement
11.1 For purposes of payment, the weight of the actual completed structures shall be
calculated from the approved drawings for different items of work. The Contractor
shall submit to the Engineer relevant material list containing the weight of each
item.
11.2 No allowances will be permitted for bolts, nuts, washers, studs, screws etc.,
galvanizing, welding or for rolling margins. One tonne for the purpose of payment
shall mean One Metric Tonne i.e. 1000 Kgs.
11.3 The weight of members made out of standard rolled section such as beams,
channels, angles etc. shall be based on standard IS: 808 without deducting for
holes, notches, bevels, cuts etc. Where a component consists of a cut joist or
channel, the full weight of the rolled section shall be considered only if more than
half the section is used. Otherwise, only half the section unit weight shall be
considered for calculation of the weight of the components.
11.4 The weight of any built-up members shall be based on the weight of each
component.
11.5 Providing safe working conditions at all work fronts at all times shall be the
responsibility of the Contractor. Adequate Personal Protective Equipment (PPE)
shall be provided to all workers & Visitors to the Site. The quoted rates shall be
deemed to include for all safety-related expenses as required for the nature of the
work being executed unless otherwise covered specifically as a payable item in the
BOQ pertaining to safety items.
11.6 The payment for the inserts and embedment shall be based on the weight of the
fabricated piece at the same rate as that applicable to structural steel. The said
rate shall be deemed to include the supply of materials (including rounds/bars),
labour and all works related to steel inserts and embedment indicated in this
specification.
 12.Annexures: Nil
****