Tunnelling of Namma Metro’s North-South underground corridor may
begin in June. The first Tunnel Earth Pressure Balance Boring Machine
for the North-South UG corridor has arrived at the Chennai Port from
Nansha in China. After clearance, the equipment is likely to arrive in
Bengaluru in the second week of April. While tunnelling in the UG
East-West section, which stretches for 4.8 km, is progressing well,
tunnelling work along the North- South UG section will begin shortly.
Tunnelling at the UG East-West section had commenced from the
Majestic end towards East and the Tunnel Boring Machine (TBM) 1, Helen
and TBM 2, Margarita, have reached Sir M. Visveswaraya Station.
Preparation to launch the machines on the East end of the stations is
going on. Meanwhile excavation of the launching shaft in Cubbon Road to
launch the 3rd TBM is complete.
“In the North- South UG section which stretches for 4 km, the
contract for tunnels and two stations with ramps was awarded to
TTS-Coastal JV in May 2011. Designs are in progress. Three Earth
Pressure Balanced Machines have been ordered; one from Seli, China and
two from Herenknecht, China. While two are expected to be operational by
June, the third will be operational by October. Works at both South and
North Ramps have commenced. At Chickpet, preliminary works of
barricading and shifting of uncharted utilities are in progress. At the
City Market, secant piling work has started,” said a senior Bangalore
Metro Rail Corporation Limited (BMRCL) official.
Underground Majestic Station (interchange station) work in progress:
Contract had been awarded to M/s GYT—Coastal (JV) for the construction
of this interchange station (3 level station) in December 2011.
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