Bangalore Metro’s TBM Varada Makes 2nd Breakthrough at Langford

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Tunnel Boring Machine S-1264 operated by Afcons Infrastructure last week recorded a tunnel breakthrough for Bangalore Metro’s 21.386 km Pink Line (Nagawara – Kalena Agrahara).

Nicknamed Varada, this was TBM S-1264’s second and final breakthrough for 3.655 km Package RT-01 (Rashtriya Military School Station – Dairy Circle Ramp) of the 73.92 km Bangalore Metro Phase 2 project.

This refurbished Herrenknecht earth pressure balance (EPB) machine was originally commissioned in March 2021 from Rashtriya Military School Station (near Vellara Junction) to build the 596 m up-line tunnel towards Langford Town where it recorded a breakthrough in November 2021.

The machine’s parts were then brought back to RMS Station and relaunched in January 2022 to build the parallel 596m down-line tunnel.

RT-01: Dairy Circle Ramp – National Military School- view Bangalore Metro Phase 2 Info & Map

Images via BMRCL:

Per the tunneling plan, Afcon was hoping to complete tunneling on this section in 235 days, and they accomplished the task in 225 days.

A video can be viewed here posted by Christin Mathew Philip at TOI.

BMRCL’s recent August newsletter indicates approximately 57% of tunneling work has been completed for Phase 2 (total scope: 20,855m).

With this development, TBM Varada’s job for the project is over and will now be retired. A total of 13 out of 26 breakthroughs have recorded: 4 on Package RT-01 by Afcons, 2 on RT-02 by L&T, 4 on RT-03 by L&T, and 3 on RT-04 by ITD Cementation.

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– TMRG





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