Bangalore Metro’s TBM Rudra Makes Breakthrough at Dairy Circle

Besides TBM S-1264, TBM S-1259 operated by Afcons Infrastructure also recorded a breakthrough at Dairy Circle Station on Bangalore Metro’s 21.386 km Pink Line which will connect Nagawara – Kalena Agrahara through 18 stations.

Nicknamed Rudra, this was TBM S-1259’s first of three breakthroughs, and Afcons’ second of eight breakthroughs for the 3.655 km Package RT-01 (Rashtriya Military School Station – Dairy Circle Ramp) of the 73.92 km Bangalore Metro Phase 2 project. Overall, this is Phase 2 project’s 4th breakthrough of likely 26 currently planned.

This Herrenknecht slurry machine was commissioned on April 23 from the South Ramp at Dairy Circle and traveled 614 meters to pierce through Dairy Circle Station’s diaphragm wall. Excavation for the station’s box is still underway, so the breakthrough was “hidden” and not visible to construction workers.

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

Similar “hidden” TBM breakthroughs have been performed by Afcons Infrastructure at Chennai Metro’s Sir Theagaraya College Station (By S-711 and 219-364) and at Kolkata by TBM S-639 at Howrah Station & Mahakaran Station, and by TBM S-616 recently at Bowbazar Shaft.

Per the tunneling plan – Rudra will now continue building rings for the up-line tunnel through Dairy Circle Station’s box towards Lakkasandra Station – a distance of 747.338 meters which Afcons hopes to complete within 243 days. During Dairy Circle Station’s excavation, those rings will be dismantled.

Rudra’s final assignment includes building a 714.510 meter tunnel towards Langford Town Station, which Afcons hopes to complete in 157 days.

Per BMRCL’s October newsletter, Afcons’ third machine Vamika (S-1260) working on the down-line had built 187 rings (261.80m or 42.7%). I’ll update this section if and when latest numbers are released.

For more updates, check out the Bangalore section or my Home Page!


written by

Global traveler who prefers mass rapid transit

17 Responses to "Bangalore Metro’s TBM Rudra Makes Breakthrough at Dairy Circle"

  1. yantraka says:

    So, is tunneling through a semi-excavated station a more efficient way of tunneling in terms of time? No time wasted for dragging the TBM or dismantling and re-assembling?

    • TMRG says:

      Believe there’s a higher cost in operating the machine (+material cost), but the time savings are significant to negate that.

  2. Gaurav says:

    Hi TMRG

    It’s not entirely related to pink line, but any updates on the purple line extension towards whitefield vis-a-via Tin factory? I believe land acquisition issues are resolved now. Can the civil work on the gap to be expedited now?
    Any ETA from your perspective when this extension can be commissioned?

  3. Anirudh Kulkarni says:

    Bro , any update on
    1) Namma Metro Blue Line (Airport line) ??
    2) Chennai-Bengaluru-Mysuru HSR ??
    3) Mumbai metro Yellow and Red lines (Possible opening)???

    • Avinash S says:

      Wrt Blue Line I see work is going between Silk board and Tin factory , I am regular ORR commuter and I monitor work . Very soon few pillars ll be ready on ORR between Iblur and Bellandur . Environmentalists have raised objections for tree felling so not much rigging activities between Silk board and Iblur . Also ground work has begun for Silk board station next to Prashanth hotel.

    • TMRG says:

      1) Piling 2) No update 3) Mid 2022? let’s see. Station work is pending at all. MMMOCL doesn’t have all the trains it needs (7 arrived so far; believe they need around 15)

  4. Hanumantha Raju says:

    BMRCL should think of constructing Metro lines on inner and outer ring roads on priority, so that with minimum cost and completing the work fast can earn income at the earliest. Also metro line on Magadi road up to Tavarekere should be taken up as neighbours of this road are middle class, lower middle class and densely populated.

    • Sivasubramanian says:

      Connecting from vellara jn to silk board should be included in a later stage ..very important link forgotten , I think

  5. Aftab says:

    Update the progress of Bengaluru sub urban rail project

  6. Jishnukrishna Venkat says:

    Any news about Civil Construction Tenders for Depots?


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