Mumbai Metro’s 1st TBM Lowered at Nayanagar Shaft
Maharashtra’s Chief Minister Devendra Fadnavis today evening joined officials from the Mumbai Metro Rail Corporation Limited and CEC-ITD Cem-TPL JV to celebrate the lowering of TBM S1073, the 33.5 km Line-3’s 1st tunnel boring machine, into the 25m deep Nayanagar Shaft in Mahim.
The 110m long Herrenknecht earth pressure balance machine passed factory acceptance testing in China in June and arrived disassembled at Mumbai Port in early September. Workers lowered its shields followed by its multi-colored cutterhead today, and will lower its backup tail over the coming weeks as weather permits.
After assembly is completed, S1073 on its first assignment will excavate and build the 2484m long up-line tunnel towards Dadar Station, through Shitladevi Station, as part of the 6.081 km package UGC-04 between Worli-Dharavi. In the coming months, it’ll be joined by its sister machine TBM S1074 for building the parallel down-line tunnel.
Location of UGC-04’s Nayanagar Shaft – view Mumbai Metro map & information
Images from the event –
Front & mid shields – Photo Copyright: Ravish Sharma
Photo Copyright: CMO Maharashtra
Cutterhead about to be lowered – Photo Copyright: Ravish Sharma
Photo Copyright: Mehul Thakkar
Photo Copyright: CMO Maharashtra
Photo Copyright: Rajendra Aklekar
Photo Copyright: Rajendra Aklekar
Photo Copyright: MMRCL
For more updates, check out the Mumbai section of The Metro Rail Guy!
– TMRG
congrats to MAPLE team
Mr TMRG,
As per the current escalation plans,the TBMs for section 4 will start the escalation from Naya Nagar TBM launching station and move in the Direction of Worli TBM retrieval station.
On the way at Mahim , Dadar and Siddhivinayak stations ,the TBM s will not be used for tunnelling.
At these points are the TBMs again dismantled before the train station and again launched after the station? If yes, this process will be unnecessarily time consuming?
I am asking this because the current escalation plan indicates so.
Can you please clarify.
S V Phene
Hi, here’s the tunneling plan for package UGC-04:
TBM S1073
Up-line – Nayanagar – Shitladevi – Dadar
Up-line – Siddhivinayak – Dadar
Down-line – Nayanagar – Dharavi
Total= 4 drives with 3 launches
TBM S1074
Down-line – Nayanagar – Shitladevi – Dadar
Up-line – Nayanagar – Dharavi
Total = 3 drives with 2 launches
TBM S1075
Up-line – Siddhivinayak – Worli
Down-line – Siddhivinayak – Worli
Down-line – Siddhivinayak – Dadar
Total = 3 drives with 3 launches
If the intermediate station’s (eg. Shitladevi) structure is not ready by the time the TBM arrives, then instead of having the TBM sit idle and lose time, they’ll continue operating the TBM through that station’s box. During that station’s excavation, they’ll then dismantle/demolish the tunnel rings. This process has previously taken place in Jaipur, Kolkata and Chennai.
If the intermediate station’s structure is ready, then they’ll use hydraulic jacks on a rail based system to drag the TBM to the other side as seen in Bangalore and Delhi. You can see images of that in action here and here.