Earlier this month, the Larsen & Toubro – Shanghai Tunnel Engg. Co. Ltd. JV completed casting their first concrete segment for building the twin tunnels of their 4.25 km UGC-01 section of Mumbai Metro’s 33.5 km Colaba – SEEPZ line. They are the 2nd contractor, after the CEC-ITD-TPL JV on package UGC-04, to begin this stage of construction.
Roughly 2900 segments are expected to be cast by L&T-STEC JV for package UGC-01 (Cuffe Parade – CST), on the southern end of the line, using molds at their casting yard in Wadala, stacked up like this, transported on-site and be fed into the 2 Robbins Crossover TBMs which’ll be commissioned in the last quarter of this year to excavate & build this section’s tunnels.
Casting work began on March 29 in an event attended by the MMRCL’s MD, Ashwini Bhide, and other officials from the contractor’s team:
A tunnel ring is typically 1.4 m wide, and consists of 5 segments + 1 ‘key’ segment. For the entire 33.5 km line, approximately 40,000 segments will be cast for all 7 civil packages.
I’ve shared this before but it’s a perfect time to rewatch this excellent video demonstrating how the segments will be used to build rings for Mumbai Metro’s tunnels when the 17 TBMs are commissioned one after the other from the under construction TBM shafts later this year. Skip to 5 mins and 15 seconds if it doesn’t automatically do so.
For more updates, check out the Mumbai section of The Metro Rail Guy!