After recording breakthroughs in October by Surya-2 and November by Surya-1, Larsen & Toubro – Shanghai Tunnel Engineering Company (L&T – STEC) JV has started moving both tunnel boring machines through Hutatma Chowk Station on Mumbai Metro’s 33.5 km Aqua Line (Line-3).
Both of these Robbins Crossover XRE TBMs, with a 6.65 meter diameter, have just one more tunneling assignment left and that is to complete the twin tunnels towards Chhatrapati Shivaji Terminus (CST) – a distance of 551m on the up-line tunnel and 556m on the down-line tunnel.
While Surya-1 on the up-line is being dragged through the station’s 233m cut & cover box using hydraulic jacks towards its northern-end, Surya-2 on the parallel down-line is tunneling through the station’s NATM-mined tunnel – generating the most unique tunneling sight in India. I really hope either one of Robbins, L&T or Mumbai Metro Rail Corporation (MMRC) is filming a time-lapse as it moves through.
More on details on the unique Hutatma Chowk Station can be viewed here.
After Surya-2 passes through Hutatma Chowk Station’s vicinity, workers will dismantle the tunnel rings built by it. What you’re seeing above and below is the station’s future down-line platform area.
Surya-1 is scheduled to be recommissioned towards CST Station by mid January. Here’s a status of package UGC-01 between Cuffe Parade and CST stations where 2 breakthroughs are pending. This table is best viewed on a desktop device –
|1||Up||Cuffe Parade||Vidhan Bhavan||1128m||Completed|
|1||Up||Hutatma Chowk||CST||551m||Yet to Begin|
|2||Down||Cuffe Parade||Vidhan Bhavan||1254m||Completed|
|2||Down||Hutatma Chowk||CST||556m||Yet to Begin|
For more updates, check out the Mumbai section of The Metro Rail Guy!