MMRC completes 100% tunnelling of Colaba-Bandra-SEEPZ line
In a huge fillip to the completion of Mumbai’s first underground Metro train service, the Mumbai Metro Rail Corporation Limited (MMRCL) on Tuesday completed 100 per cent tunneling work for the Colaba-Bandra-SEEPZ Metro 3 project.
The final breakthrough in the tunneling process was made by Tunnel Boring Machine (TBM) Tansa 1 the Mumbai Central Metro Station. In civil engineering parlance, a breakthrough is defined when a TBM, lowered in a particular shaft, manages to bore through the defined geological route and emerges successfully at a designated end.
The breakthrough, the 42nd one made by a TBM, was made after a challenging drive of 837 m from Mahalaxmi Metro Station to Mumbai Central Metro Station up line in 243 days, using 558 concrete rings.
