CHENNAI (Metro Rail News): On the underground metro line from Dairy Circle to Nagavara two tunnel-boring machines (TBMs) have been deployed which have achieved a breakthrough four days apart.
TBM Vamika completed the tunnelling of 614 metres from the south ramp (near the Jayanagar Fire Station) to Dairy Circle on January 3 and TBM Avni accomplished the forward leap on the 1,086-metre section from Shivajinagar to MG Road on January 6 (Thursday).
Tamika will proceed with its forward excursion to the proposed Lakkasandra station while Avni will continue to tunneling onwards to Rashtriya Military School on Hosur Road. Vamika will be following TBM Rudra, which finished the tunneling of the equal 614-meter line between the south ramp (close to the Jayanagar Fire Station) and Dairy Circle on November 11 and is presently headed towards the Lakkasandra station.
TBM Avni experienced hard stones for a length of around 280 meters, wherein tunneling was incredibly difficult and required exceptionally incessant intercessions. This TBM will pass through the (MG Road) station region for additional tunneling to Rashtriya Military School,” the Bangalore Metro Rail Corporation Limited (BMRCL) said in an assertion.
Avni’s pair, TBM Lavi, is tunneling the equal (north-bound) segment and is probably going to accomplish a breakthrough not long after confronting comparative difficulties. The TBM that finishes one method of the passage will be redeployed on another part. The machine will be dismantled and taken to the launching shaft of another part where the whole TBM will be reassembled with the goal of tunneling once again. TBM Urja, which finished the Cantonment-Shivajinagar area in September, has been redeployed to tunnel from Cantonment to Pottery Town station.