L&T Casts 3000+ Tunnel Segments for Bangalore Metro’s Pink Line

In a nondescript property in Peenya or thereabouts in north Bangalore, Larsen & Toubro has completed casting over 3000 tunnel ring segments for building tunnels for the 21.386 km Line-4 (Reach 6 / Pink Line) of the 73.92 km Bangalore Metro Phase 2 project.

Larsen & Toubro is responsible for building the 2.755 km package RT-02 (Vellara Road – Shivajinagar) and 2.884 km package RT-03 (Shivajinagar – Tannery Road), which were awarded by the Bangalore Metro Rail Corporation Ltd (BMRCL) in February 2019.

A tunnel ring is typically 1.4 m wide, and consists of 5 segments + 1 smaller ‘key’ segment. As per an industry source, TBMs Avni & Lavi on RT-02 will build 3139 tunnel rings while TBMs Urja & Vindhya on RT-03 will build 3385 rings – leading to a total of 6524 rings (32,620 segments & 6524 key segments) that need to be cast.

Casting work using specialized molds commenced in August 2019:

1st tunnel ring segment cast by L&T – Photo Copyright: BMRCL via Sept ’19 newsletter

Here are some fantastic images of L&T’s yard shared by ಬೆಂಗಳೂರು TrainUsers (@bengalurutrains) on Twitter –

I’ve shared this before, but it’s a perfect time to rewatch this excellent video demonstrating how L&T, Afcons and ITD Cementation’s 9 tunnel boring machines will use segments to build rings for Bangalore Metro’s tunnels after they’re commissioned one after the other over the next 12 months.

Skip to 5 mins and 15 seconds if it doesn’t automatically do so.

For more updates, check out the Bangalore section of The Metro Rail Guy!


written by

Global traveler who prefers mass rapid transit

One Response to "L&T Casts 3000+ Tunnel Segments for Bangalore Metro’s Pink Line"

  1. Tony Jose says:

    How do they plan to proceed with the tunneling in the absence of their Chinese counterparts. Weren’t there problems regarding beginning operations without their presence?


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