L&T’s Mumbai Coastal Road Project sets world record in Tunnel Boring

By excavating 456.72 m at the prestigious Mumbai Coastal Road Project, Package 4, Larsen & Toubro’s 12.19 m dia Slurry TBM (Tunnel Boring Machine), known as “Mavala,” set a world record for monthly lengths. The TBM, currently the largest in use in the nation and deployed from Girgaon Chowpatty, broke the previous record held by a 13m single shield EPB (Earth Pressure Balance) TBM of 455.4 m for monthly tunnelling.

Delivery of TBM Mavala took place when the pandemic was at its worst. The TBM, weighing about 2,500 tonnes, was then lowered into the launching shaft in its finished state. Another creative strategy they used was to “rotate” the TBM inside the shaft to begin the second tunnel construction, which allowed them to cut down on the time it took to disassemble, lift, transport, and reassemble the tunnel by several months.

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