A B C D E
1 MAHARASHTRA STATE ROAD DEVELOPMENT CORPORATION - MUMBAI-
PUNE EXPRESSWAY PROJECT
REVIEW COMMENT SHEET (RCS)
Submission of Compliance for the comments for Method Statement of Adit-
2 1 Tunnel Excavation(NEC-MPEW-2019-20-320), dated 03.02.2020
3 Document number Document title Design Stage
Submission of Compliance for the comments for Method Statement of Adit-1 Tunnel
4 GLJV-A3000-CON-CIV-TNL-RCS-0043 Excavation(NEC-MPEW-2019-20-320), dated 03.02.2020 NA
STATUS
5 Revision R0 GLJV REVIEWERS GLJV APPROVER
Closed / Not Closed
6 Enter the latest revision being reviewed R0 Not Closed Gagan Sharma Noel Peralta Mundo
7 REVIEW CODE SIGNATURES SIGNATURE
REVIEW CODES:
R: REJECTED
R&R: REVIEW AND RESUBMIT
8 NOWC: NON OBJECTION WITH COMMENTS R&R
NO: NON OBJECTION
NOTE: no construction allowed for R and RR review codes
9 Date 5/27/2020 5/27/2020
DESIGN STAGE:
Design Stage 1 (DS1): To fix the design criteria and other preliminary design inputs before heading to detailed design
Design Stage 2 (DS2): Preliminary design for each discipline
10
Design Stage 3 (DS3): Detailed design with interfaces and interdisciplinary checks resolved
Design Stage 4 (DS4): Issued for Construction
GLJV-A3000-CON-CIV-TNL-RCS-0043 1 05/27/2020
MAHARASHTRA STATE ROAD DEVELOPMENT CORPORATION - MUMBAI-PUNE EXPRESSWAY
PROJECT REVIEW COMMENT SHEET (RCS)
Submission of Method statement for Adit-1 Tunnel excavation (NEC-MPEW-2019-20-282), dated
24.12.2019
Design
DRS No: Submission Date:
Stage
GLJV-A3000-CON-CIV-TNL-RCS-0043 MS 2/3/2020
Comments Sent by Letter No. Revision Comments Issued On:
SO-P1-0284 R1 2/27/2020
COMMENTS OVERALL STATUS:
CLOSED NOT CLOSED
Reference of
Section/ Page/ Doc.
S No. MS submitted GLJV COMMENTS By NAVAYUGA RESPONSE By Status
Part No. Rev.
by NEC
Method statement for Adit-1 Tunnel excavation
MSRDC-
Please refer to the SO 0045 dated 10-05-2019 and ensure all method
MPML Tunnel-
Method statement statement shall be submitted. The method statement has to be
1 EPC-2018, R1 GLJV Noted Open
(MS) delivered on time before starting to allow Engineer’s check and
Schedules D,
approval and in any case not later than 28 days before starting.
clause 2.7
MS Page Pleases submit the Method statement for the Geological mapping
2 Geological Mapping R1 GLJV Open
no.04 including the template for the mapping and procedure.
2a. Please provide your response and submit asap.
Please provide the complete sequence for Tunnel Excavation
including Survey / Profile markings before drilling etc. Please include
3 MS point no. 3 Scope R1 GLJV Sequence for Tunnel Excavation and Cycle time attached Open
the working cycle for excavation and proposed support in each rock
class.
After reviewing the Tunnel excavation cycle AE observed the cycle
time can be reduced during Muckiing and scaling activities by
deploying appropiate machinery for mucking such as by using tilt
3a Open
loader instead od Long boom excavator with which turning and
movement of the excavatoe take too much time, by replacing this with
Tilt loader will serve the purpose.
Please provide the Blasting pattern in consideration with length of
Charging and
blast hole, expected pull length, explosive dimension, details of charge
4 MS point 4 Blasting R1 GLJV Blasting Pattern Attached Closed
hole/ delay, numbers of charge hole/s & dummy holes etc. for each
Preparation
rock class.
Controlled perimeter blasting techniques shall be used to produce rock
faces conforming to the required excavation lines, slopes, elevations
MSRDC- and dimensions shown on the drawings with a minimum of
MPML Tunnel- disturbance to the rock at, or outside of the excavation pay lines.
Controlled
5 EPC-2018, Drill holes for controlled perimeter blasting shall not be less than 42 R1 GLJV Blasting Pattern Attached Closed
perimeter blasting
Schedules D, millimeters in diameter and shall be a single row of closely spaced
clause 7.7.2 holes drilled to a maximum depth of one round length along the
excavation pay lines and a spacing of 0.4 to 0.6 m depending on the
ground condition.
MSRDC-
MPML Tunnel- Support for The required supports shall be installed without delay during the
6 EPC-2018, underground process of excavation within the heading zone, without which further R1 GLJV Noted and already incorporated Closed
Schedules D, excavation advance shall not be allowed
clause 7.4.4
GLJV-A3000-CON-CIV-TNL-RCS-0043 2 05/27/2020
MAHARASHTRA STATE ROAD DEVELOPMENT CORPORATION - MUMBAI-PUNE EXPRESSWAY
PROJECT REVIEW COMMENT SHEET (RCS)
Submission of Method statement for Adit-1 Tunnel excavation (NEC-MPEW-2019-20-282), dated
24.12.2019
Sealing layer of shotcrete shall be applied for the each excavated
round. No further excavation shall be allowed without completing the
MS Page no. Post Blast Primary
7 support for previous excavated round for safety concern. Please R1 GLJV Noted and already incorporated Closed
10 & 13 support sequence
review your MS (page no 13) and submit revised MS as per contract
clause 7.4, 7.6.12 & 9.1.
Where common Geological failure would be evident in advance due to
MSRDC- the following reasons, the Contractor shall ascertain the possible
MPML Tunnel- failure mode and adopt appropriate excavation methodology to contain
Common
8 EPC-2018, the possible over break: Rock Stratification Noted and already incorporated in geological mapping Open
Geological failure
Schedules D, Pattern of main joint sets
clause 7.6.18 Peeling of rock close to the surface at site
Orientation of ground excavation viz-a-viz the bedding plane
MSRDC-
MPML Tunnel- Please provide the instrument and monitoring drawings including the
EPC-2018, Instrumentation & Awareness level, attention level & Alarm limit. Close monitoring shall
9 R1 GLJV Noted Open
Schedules D, monitoring be done to record the deformation and report shall be submitted to AE
clause 8.1 to according to the 8.3,8.4 & 8.8.5
8.8
9a Please incorporporate in the MS and submit.
Instrumentation & monitoring team shall submit the daily, weekly &
monthly report and ensure the 3D target should be installed as per
10 MS page no 23 15.7 Noted Open
contract document 8.8 and design drawing. Please update the
responsible person name & details in Method statement.
10a Please submit asap.
After every Blast a copy of Profile sections may be submitted to AE,
Over break/under this would not only help in locating the exact location where the under
11 MS point 7 R1 GLJV Ok, Noted Open
cut cut/ovrebreak has occurred but also for sorting out solution not to
happen again.
11a Please add MS and submit.
Scaling shall be checked by Experience Tunnel engineer or
Engineering Geologist. Manual scaling must be done prior to the face
12 General Scaling R1 GLJV Ok, Noted Open
mapping & no person shall be allowed to enter in the Un- supported
Span.
12a Pleas eincorporate this in MS
Please include a Time cycle in consideration with all activity to
13 General Time- Cycle R1 GLJV Cycle Time Attached Open
complete a excavation cycle.
After reviewing the Tunnel excavation cycle AE observed the cycle
time can be reduced during Muckiing and scaling activities by
deploying appropiate machinery for mucking such as by using tilt
13a Open
loader instead od Long boom excavator with which turning and
movement of the excavatoe take too much time, by replacing this with
Tilt loader will serve the purpose.
Please explain the scheme for the Dewatering during the construction.
A drawing/ sketch shall me attached with the sump details (i.e. depth
14 MS point 8 Dewatering & size, distance in between sumps). Layout and capacity of pumps R1 GLJV Dewatering Setup Plan attached Closed
and pipes, Sumps, drains both open and covered, well points etc. and
details of standby dewatering arrangement shall be included.
GLJV-A3000-CON-CIV-TNL-RCS-0043 3 05/27/2020
MAHARASHTRA STATE ROAD DEVELOPMENT CORPORATION - MUMBAI-PUNE EXPRESSWAY
PROJECT REVIEW COMMENT SHEET (RCS)
Submission of Method statement for Adit-1 Tunnel excavation (NEC-MPEW-2019-20-282), dated
24.12.2019
Rock support Records shall be mentioned containing all the particulars
of the tunnel support actually installed and its performance in the
course of works shall be prepared and available to Authority engineer
MS Pont 11,
on a daily basis. These records include type, quantity, location of
MSRDC-
support elements installed the clearance profile after the installation of
MPML Tunnel- Primary support
15 support, deviation from the standard support system, observation R1 GLJV Noted Open
EPC-2018, measures
excessive deformations, shotcrete cracking etc. and submitted daily to
Schedules D,
the Authority Engineers. Rock dowel installation records shall be
clause 9
include grout details, drilling depth, length, type of rock bolts, type &
time of grouting, time of tightening, special observations, etc. those
records shall be submitted on daily basis.
15a Please incorporate in the MS Open
Please refer to clause 7.12.2,The outlet of the duct shall be kept as
MS Pont 11,
close to the face as is practicable, Please refer to the MS page no 18
MSRDC-
and revised the safe distance.
MPML Tunnel-
16 Ventilation Tunnelling shall not continue more than 10 m unless positive R1 GLJV Ventilation Setup Plan attached Open
EPC-2018,
ventilation has been established. Please mention the capacity of
Schedules D,
Ventilations fans and dia. of ventilation duct to be used for Tunnel
clause 7.12.2
ventilation.
16a Ventilation under review by AE R1 Open
GLJV-A3000-CON-CIV-TNL-RCS-0043 4 05/27/2020
