CHENNAI:
A major tunnelling milestone was achieved on Friday as Chennai Metro Rail Limited (CMRL) completed a tunnel breakthrough at Mandaveli station on Corridor 3 of the Phase II expansion.
The upline tunnel boring machine (TBM) “Vaigai” broke through after a 610-day drive from Greenways station, completing a 775-metre stretch beneath one of the city’s most densely built-up areas. The works form part of the 45.8-km Corridor 3, which will link Madhavaram to SIPCOT via the city’s central and southern neighbourhoods.
The breakthrough was witnessed by T Archunan, Director (Projects), CMRL, along with senior officials from the agency, consultants and Larsen & Toubro, which is executing the tunnelling contract.
The Vaigai TBM passed beneath 75 buildings with an overburden ranging from 9 to 12 metres, navigating a complex underground environment with multiple sewer, water and power utilities in the Mandaveli shaft area. “This was one of the most technically challenging stretches on the corridor. Utility diversions and ground conditions required careful planning and multiple cutterhead interventions, a release stated.
Vaigai operated mainly in closed-face mode through silty sand formations and underwent 13 cutterhead interventions during the drive. Its twin machine, “Noyyal,” is expected to complete the downline breakthrough at Mandaveli next month.
This is the third TBM breakthrough achieved by CMRL this month — after successful drives at Rr k Salai and Kodambakkam, the release stated.
A major tunnelling milestone was achieved on Friday as Chennai Metro Rail Limited (CMRL) completed a tunnel breakthrough at Mandaveli station on Corridor 3 of the Phase II expansion.
The upline tunnel boring machine (TBM) “Vaigai” broke through after a 610-day drive from Greenways station, completing a 775-metre stretch beneath one of the city’s most densely built-up areas. The works form part of the 45.8-km Corridor 3, which will link Madhavaram to SIPCOT via the city’s central and southern neighbourhoods.
The breakthrough was witnessed by T Archunan, Director (Projects), CMRL, along with senior officials from the agency, consultants and Larsen & Toubro, which is executing the tunnelling contract.
The Vaigai TBM passed beneath 75 buildings with an overburden ranging from 9 to 12 metres, navigating a complex underground environment with multiple sewer, water and power utilities in the Mandaveli shaft area. “This was one of the most technically challenging stretches on the corridor. Utility diversions and ground conditions required careful planning and multiple cutterhead interventions, a release stated.
Vaigai operated mainly in closed-face mode through silty sand formations and underwent 13 cutterhead interventions during the drive. Its twin machine, “Noyyal,” is expected to complete the downline breakthrough at Mandaveli next month.
This is the third TBM breakthrough achieved by CMRL this month — after successful drives at Rr k Salai and Kodambakkam, the release stated.
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