Mumbai Metro’s TBM S-1074 Records Breakthrough at Dadar

Moments ago, Tunnel Boring Machine S-1074 (Krishna-2) operated by the Continental Engineering Corp – ITD Cementation – Tata Projects JV made a breakthrough at Dadar Station’s southern-end on Mumbai Metro’s 33.5 km Aqua Line (Line-3).

This was S-1074’s third (and final) breakthrough, 6.08 km Package UGC-04’s 7th of 8 planned breakthoughs for the Worli – Dharavi section, and overall Line-3’s 32nd of 41 planned breakthroughs.

This Herrenknecht TBM passed factory acceptance testing (FAT) in August 2017, and was commissioned in December 2017 to first build the 2472m down-line tunnel from Nayanagar Shaft to Dadar Station. After recording a double breakthrough along with its sister machine S-1073 in January 2019, it was recommissioned again from Nayanagar Shaft to build the 589m down-line tunnel towards Dharavi Station.

For its last assignment that ended today – the machine was dismantled and recommissioned from the other end of UGC-04 in December 2019 to build the up-line’s 1106 meter tunnel from Siddhivinayak Station to Dadar Station.

CEC-ITD Cem-TPL JV’s Package UGC-04 now has just 1 more breakthrough pending, also at Dadar Station for the parallel 1126 meter down-line tunnel. That breakthrough is expected to take place in December with another 520 meters or so more to go.

Here’s a table displaying UGC-04’s tunneling plan (best viewed on a desktop device) and the status of each tunnel –

TBM	Line	From	To	Distance	Status
1	Up	Nayanagar Shaft	Dadar	2491m	Completed Jan 31 2019
1	Up	Nayanagar Shaft	Dharavi	589m	Completed Nov 21 2019
1	Down	Siddhivinayak	Dadar	1126m	In Progress
2	Down	Nayanagar Shaft	Dadar	2472m	Completed Jan 1 2019
2	Down	Nayanagar Shaft	Dharavi	589m	Completed Oct 11 2019
2	Up	Siddhivinayak	Dadar	1106m	Completed Today!
3	Up	Siddhivinayak	Worli	1305m	Completed Mar 15, 2019
3	Down	Siddhivinayak	Worli	1284m	Completed March 16, 2020

With 32 breakthroughs completed, there are now just 9 more breakthroughs pending on Mumbai Metro’s Line-3:

Package	Section	Distance, Status
UGC-01	Churchgate – Hutatma Chowk (up-line)	650m, In Progress
UGC-01	Hutatma Chowk – CST (up-line)	551m, Not Started
UGC-01	Churchgate – CST (down-line)	1233m, In Progress
UGC-03	Science Museum – Mahalaxmi (up-line)	1118m, Not Started
UGC-03	Mahalaxmi – Mumbai Central (up-line)	837m, Not Started
UGC-03	Science Museum – Mahalaxmi (down-line)	1136m, In Progress
UGC-03	Mahalaxmi – Mumbai Central (down-line)	830m, Not Started
UGC-04	Siddhivinayak – Dadar (down-line)	1126m, In Progress
UGC-06	Sahar Road – CSIA T1 (up-line)	1516m, In Progress

For more updates, check out the Mumbai section of The Metro Rail Guy!

– TMRG