TBM T61 provides a rapid pace to tunnelling work of Mumbai Metro Line-3


MUMBAI (Metro Rail News): Tunnel Boring Machine (TBM) T61 nicknamed Tapi-1 operated by the J Kumar Infraprojects – China Railway Tunnel Group JV made a breakthrough at Chhatrapati Shivaji Maharaj International Airport’s Domestic Terminal-1 Station’s northern-end on Mumbai Metro’s 33.5 km Aqua-Line (Line-3).
This was T61’s second (and final) breakthrough, J Kumar – CRTG’s fifth (and penultimate) breakthrough for the 4.45km Santa Cruz Mid Ventilation Shaft – CSIA Terminal 2 Package UGC-06, and overall Mumbai Metro Line-3’s 31st TBM breakthrough.
This Ø6.68m dual-mode Terratec TBM had passed factory acceptance tests in September 2017 and arrived in the city in November 2017.

For its first assignment, it was commissioned as TBM Godavari-1 from Package UGC-05’s Vidyanagari Station to the Santa Cruz Mid Ventilation Shaft (dead-end of UGC-05/06) and onwards to CSIA’s Terminal-1 Station for building the 2895 meter up-line tunnel, and recorded a joint breakthrough for UGC-05 and UGC-06 in April 2019.
For its last assignment that ended today – the machine was commissioned from Sahar Road Station towards Terminal 1 in September 2019 to build the 1512 meter down-line tunnel.

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