TERRATEC has announced the delivery of the first of five 6.61m diameter EPBMs that will be used by Tata Projects Ltd. for its underground works contracts on Chennai Metro Rail Phase-II Corridors India, following successful factory testing of the S96 machine this month.
The new TBMs will be used by contractor Tata Projects Ltd. on Chennai Metro Rail tunnelling contract for Chennai Metro Rail Limited (CMRL) to build Phase 2 – Corridor 3, from Venugopal Nagar Station to Kellys Station. The work involves the construction of 18km of bored tunnels. TERRATEC will provide five of the seven TBMs required for the package.
The Mixed Ground EPBMs have been chosen to tackle this project because of the variable geological conditions (boreholes indicate sand, silt, clay on the tunnel drives with some weathered rock). The expected “mixed ground” will be dealt with by the TBM’s mixed-face dome-style cutterheads designed to work effectively in the geology on these contracts at pressures of up to 4 bar. Other features include VFD electric cutterhead drives, tungsten carbide soft ground cutting tools that are interchangeable with 17’’ roller disc cutters, high torque screw conveyors, active articulation systems and state-of-the-art guidance and control systems.
As the TBMs progress, they will install 1,400mm wide by 275mm thick universal reinforced concrete lining rings consisting of five segments plus a key.
Chennai Metro is the fourth longest metro system in India. The network currently consists of two lines covering a length of 54.65km. The new Line 5 of Chennai metro will have 48 stations and connect from Madhavaram to Sholinganallur. The project is anticipated to be completed in about four years.
Being one of India’s fastest growing cities, Chennai is facing severe traffic congestion that is increasing in severity as time goes by. Therefore, the government has decided to implement the Chennai Metro Rail Project. This project aims to provide the people of Chennai with a fast, reliable, convenient, and economical mode of public transport.
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