Tunnel Boring Machine S-1260 operated by Afcons Infrastructure on Monday recorded a tunnel breakthrough at Lakkasandra Station’s site for Bangalore Metro’s 21.386 km Pink Line (Nagawara – Kalena Agrahara).
Nicknamed Vamika, this was TBM S-1260’s second breakthrough for the southbound tunnel of the 73.92 km Bangalore Metro Phase 2 project‘s 3.655 km Package RT-01 connecting Rashtriya Military School Station – Dairy Circle South Ramp.
This Herrenknecht earth pressure balance (EPB) machine was originally commissioned from the South Ramp in June 2021 and traveled 614 meters to record a “hidden breakthrough” at Dairy Circle Station in January 2022.
The machine then continued tunneling through Dairy Circle Station’s box and traveled another 747.338 meters to arrive at Lakkasandra Station’s site.
Per the tunneling plan, Afcons was hoping to complete tunneling on this section in 243 days and they accomplished the task in 232 days.
A video posted by Srivas Rajagopalan at BMRCL can be viewed here.
I hear TBM Rudra (S-1259), working on the northbound tunnel on the same route, continues to be stuck in a garbage dump that earlier used to be a granite quarry.
TBM Vamika now has just 1 more assignment pending, a 714.51m tunnel towards Langford Town Station which Afcons hopes to complete in 157 days.
BMRCL’s recent November newsletter indicates approximately 62.39% of tunneling work had been completed for Phase 2 (total scope: 21,041m) by October-end.
With this development, a total of 15 out of 26 breakthroughs have recorded: 5 on Package RT-01 by Afcons, 3 on RT-02 by L&T, 4 on RT-03 by L&T, and 3 on RT-04 by ITD Cementation. I hear ITD’s TBM Bhadra (S-840) is expected to arrive at Shadi Mahal Shaft on December 16, so stay tuned!
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