TBM 1239 Makes a Breakthrough for Mumbai Metro Line-3 at Worli

This afternoon, tunnel boring machine 1239 operated by Doğuş-Soma JV recorded a breakthrough at the southern-end of Worli Station for package UGC-03 of Mumbai Metro’s 33.5 km Line-3 (Aqua Line) .

This Ø6.65m new Robbins slurry machine, nicknamed Tansa-2, was commissioned in November 2018 from the Science Museum Station to build the 2057m down-line tunnel towards Worli. Along the way, it passed through Acharya Atre Chowk Station’s box which wasn’t ready in time to receive the machine, so the rings built over there will be dismantled during excavation.

This was 1239’s first (and penultimate) breakthrough, Doğuş-Soma JV’s second breakthrough for the 5.06 km Mumbai Central – Worli package UGC-03, and overall Line-3’s 28th breakthrough.

Post-retrieval, the TBM’s shields are expected to be retrieved and transported as one unit, in the interest of time, just like how its sister-machine TBM 1238’s was done earlier this month.

Package UGC-03 now has 4 more breakthroughs pending. Here’s a table displaying its tunneling plan (best viewed on a desktop device) and the status of each tunnel –

TBM	Line	From	To	Distance	Status
1	Up	Science Museum	Worli	2072m	Completed Jan 2020
1	Up	Science Museum	Mahalaxmi	1118m	Pending
2	Down	Science Museum	Worli	2057m	Completed Today!
2	Down	Science Museum	Mahalaxmi	1136m	Pending
3	Up	Mumbai Central	Mahalaxmi	837m	Pending
3	Down	Mumbai Central	Mahalaxmi	830m	Pending

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

– TMRG