Moments ago, Tunnel Boring Machine (TBM) S64 operated by the J Kumar Infraprojects – China Railway Tunnel Group JV made a breakthrough at Dharavi Station’s northern-end on Mumbai Metro’s 33.5 km Aqua Line (Line-3).
This was S64’s second (and final) breakthrough, J Kumar – CRTG’s sixth (and final) breakthough for the 4.94 km Dharavi – CSIA T1 package UGC-05, and overall Mumbai Metro Line-3’s 30th TBM breakthrough.
Like its sister machine S63 (Godavari-3), this Ø6.61m Terratec Earth Pressure Balance TBM, nicknamed Godavari-4, previously saw action in Delhi to build its new Pink Line (package CC-20 / CC-24) for the 162 km Phase 3 project, and was then extensively refurbished and retooled for this section’s highly weathered ground conditions at a yard located in Mundka, Delhi.
The TBM was first commissioned from BKC Station’s northern-end in October 2018 to build the 886 meter up-line tunnel to Vidyanagari Station. After its breakthrough in April 2019, it was then recommissioned to build the 1462 meter up-line tunnel towards Dharavi Station during which it passed right beneath the Mithi River at a depth of 8-12m below the riverbed.
Last week, a TOI article quoting MMRCL suggested 45,560/54,523m (83%) of tunneling works had been completed.
With this development, tunneling works on 3 out of 7 packages have been wrapped up –
- UGC-02: CST – Mumbai Central (4.049 km) – Final breakthrough recorded by TBM T59 (Vaitarna-2) in April 2020
- UGC-05: Dharavi – CSIA T1 (4.94 km) – Final breakthrough recorded by TBM S64 (Godavari-4) today
- UGC-07: CSIA T2 – Sariput Ramp (4.157 km) – Final breakthrough recorded by TBM D213 (Wainganga-2) in December 2019.
With 30 breakthroughs completed, there are now just 11 more breakthroughs pending (this table is best viewed on a desktop device)
|UGC-01||Churchgate – Hutatma Chowk (up-line)||660m, 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, Not Started|
|UGC-03||Mahalaxmi – Mumbai Central (down-line)||830m, Not Started|
|UGC-04||Siddhivinayak – Dadar (up-line)||1106m, In Progress|
|UGC-04||Siddhivinayak – Dadar (down-line)||1126m, In Progress|
|UGC-06||Sahar Road – CSIA T1 (up-line)||1516m, In Progress|
|UGC-06||Sahar Road – CSIA T1 (down-line)||1512m, In Progress|
For more updates, check out the Mumbai section of The Metro Rail Guy!