Bengaluru Metro paintings hits a roadblock, wishes 1.5 extra years for tunnelling
Tunnelling via this valuable commercial enterprise district has been observed to be the maximum hard because the geological situations pressured BMRCL to droop uninteresting paintings 713 instances for repair/preservation of the seven Tunnel Boring Machines (TBMs).
Bangalore Metro Rail Corporation Limited (BMRCL) has suspended uninteresting paintings for Namma Metro 713 instances because of unfavorable geological situations. The tough underground with rocks and rocky soil among Shivajinagar and MG street has additionally made it even extra tough for BMRCL to finish the Namma Metro’s segment 2 underground section.
The MG Road-Shivajinagar stretch is a part of the city’s longest underground Metro corridor. Tunnelling via this valuable commercial enterprise district has been observed to be the maximum hard because the geological situations pressured BMRCL to droop uninteresting paintings 713 instances for repair/preservation of the seven Tunnel Boring Machines (TBMs) that have finished five.7km of tunnelling which include Shivajinagar-mg street, South ramp- dairy circle, Vellara junction- Langford metropolis and cantonment- Shivajinagar.
It is stated that the cutter discs are both wiped out or there's a postpone in putting in appropriate ones to reduce via rocky soil or rocks primarily based totally at the geological situations. Often while a rock is encountered withinside the course the cutter discs, which generally are hooked up at the cutter head of the TBMs, want to be changed. Depending upon how difficult the rock is, the no of cutter discs varies.
Interestingly, 325 such cutter discs have been changed in TBM Avni in only 388 days, which turned into drilled among a 1,086m stretch among Shivajinagar and MG Road (southbound). Also, TBM Lavi which turned into constructing a tunnel at the equal section (1076m, northbound), is understood to have required 295 discs.
As in step with an professional from BMRCL, every cutter disc expenses the contractors around ₹1. five-three lakh. But maximum of the time those discs grow to be unrepairable and regularly now no longer healthy for reuse as they get broken after they come upon difficult rock or boulders withinside the soil.
As in step with Mr Gudge, the BMRCL plans to complete the last tunnelling paintings in every other 1.five years with Metro operations at the Pink Line to begin via way of means of 2025. BMRCL has additionally introduced that it has until date finished 40% of the tunnelling paintings.
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