BANGALORE, INDIA (Metro Rail News): Afcons Infrastructure’s TBM S-1259 also made a breakthrough at Dairy Circle Station on Bangalore Metro’s 21.386 km Pink Line, which would connect Nagawara – Kalena Agrahara through 18 stops.
TBM S-1259, dubbed Rudra, made the first of three 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, and Afcons made the second of eight breakthroughs. Overall, this is the project’s fourth breakthrough out of a total of 26 scheduled for Phase 2.
This Herrenknecht slurry machine was launched on April 23 from Dairy Circle’s South Ramp and went 614 metres to pierce the diaphragm wall of Dairy Circle Station. The station’s box is still being excavated. Therefore the breakthrough was “hidden” and unnoticed by construction personnel.
Similar “secret” TBM breakthroughs have been made by Afcons Infrastructure in Chennai Metro’s Sir Theagaraya College Station (By S-711 and 219-364), TBM S-639 at Howrah Station & Mahakaran Station, and TBM S-616 at Bowbazar Shaft lately.
Rudra will now begin creating rings for the up-line tunnel under Dairy Circle Station’s box to Lakkasandra Station, a distance of 747.338 metres that Afcons aims to finish in 243 days, according to the tunnelling plan. Those rings will be dismantled during the excavation of Dairy Circle Station.
Rudra’s final task is to construct a 714.510-meter tunnel leading to Langford Town Station, which Afcons intends to finish in 157 days. According to BMRCL’s October newsletter, Afcons’ third machine, Vamika (S-1260), has manufactured 187 rings on the down-line (261.80m or 42.7 per cent). If and when the most recent figures are released, I’ll update this area.
