TBM T-58 Commissioned for Mumbai Metro’s Line-3 towards Kalbadevi
Following a small puja, engineers and workers from the Hindustan Construction Company – OSJC Moscow Metrostroy JV yesterday commissioned T-58 – their first of 2 Terratec tunnel boring machines at the Chhatrapati Shivaji Terminus (CST) Station’s northern end in Mumbai. After TBM S-1073, this is the 2nd of 17 TBMs to be commissioned for building Mumbai Metro’s new 33.5 km Line-3 tunnels.
This Ø6.68m 817 tonne dual-mode TBM successfully passed factory acceptance testing (FAT) in July 2017, arrived at the city’s port in mid September and was lowered into the shaft for assembly towards the end of October.
The TBM’s assignment includes excavating 3817m of tunnels for the up-line from CST → Kalbadevi → Girgaon → Grant Road → Mumbai Central as part of the 4.049 km package UGC-02 (Chhatrapati Shivaji Terminal Station – Mumbai Central’s TBM receiving shaft), which was awarded by the Mumbai Metro Rail Corporation Ltd. in July 2016.
UGC-02: CST – Mumbai Central section of Line-3 – view Mumbai Metro map & info
Video of cutterhead being tested in mid-November –
Video – TBM T-58’s cutterhead being tested inside #Mumbai Metro Line-3’s CST Station Shaft. This and S-1074 at Nayanagar Shaft are planned to be commissioned by month-end ? pic.twitter.com/nOjLCZctI2
— The Metro Rail Guy (@TheMetroRailGuy) November 21, 2017
First segment getting lowered into the shaft on November 26 – Photo Copyright: Sandeep Kumar
As of now, 2 out of 12 temporary rings have been erected/built within the station’s shaft, before excavation and permanent ring activity begins in December. Some images –
1st segment for a temporary ring placed on November 28
Photo Copyright: Afzal Sonu
Next up, TBM S-1074 is planned to be commissioned on December 4 for building the down-line tunnel from Nayanagar Shaft towards Sitladevi Station.
December 4 Update – Today an “official” launch ceremony was held for MMRCL’s MD and other officials to witness. A total of 7 temporary rings have now been erected. Some images –
Photo Copyright: MMRCL
CST Station at Azad Maidan – Photo Copyright: MMRCL
For more updates, check out the Mumbai section of The Metro Rail Guy!
– TMRG
Admin… what is the difference between temporary and permanent ring. Can you explain it!
Temporary rings are erected within the shaft and permanent rings within the ground.
Since the TBM’s segment erector (in red above) is a little far behind the shaft’s face/wall , the contractor has to build some temporary rings within the station. Without building those temporary rings, the TBM can’t move ahead.
Towards the end or after tunneling work is completed, workers will dismantle and discard those temporary rings. See this tweet for images shot in Lucknow –
https://twitter.com/TheMetroRailGuy/status/893456910191652864
Bhai what about botanical-kalkaji metro???
Nov. Last was start date december is abt to come what is the status???
Will post about the launch date when known. Not sure what the reason for the hold-up is.
Hello..what about mira road metro??
That line requires the state government’s approval, before any sort of tendering work begins to appoint contractors.
TMRG with space a luxuxry in a city like Mumbai. Shouldn’t the govt have choosen an all underground Metro. Because the metro1 project after construction has destroyed main arterial roads JP road & Andheri Kurla road.
Definitely, and I think it’s a crime to continue cluttering up the cityscape and road space with ugly concrete structures.
While developed countries (or those aspiring to be one) are pulling down elevated monstrosities, our planners are doing the exact opposite. Project financing of course plays a big role, but at some point of time, we need to start introspecting and think about the kind of cities we want future generations to live in.
Tearing down FOB/Skywalks and building proper basic footpaths would be a good start.
City planning is a long term plan. The Singapore MRT, which is underground as you said doesn’t clutter the city landscape, It has embbed with the urban area harmoniously and our metro looks like a massive building block out of nowhere. I hope the colaba – seepz underground project nudges the hovt to go for more underground projects, inspite of the cost.