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    MMRC pressing 16 TBMs into service

    Mumbai Metro Rail Corporation
    The Mumbai Metro Rail Corporation, which has recently received the first Tunnel Boring Machine (TBM) to be used to drill twin tunnels for the 33.5 km Colaba-Bandra-SEEPZ Metro-3 line, is awaiting sixteen more highly-mechanized TBMs to carry out 51 km drilling work in multiple tunnels. Procured from German major Herrenknecht AG, from its manufacturing facility in Guangzhou, China, the TBM will be lowered from launching shaft in Naya Nagar, Mahim using cranes with heavy gantry of capacity of 135 tons. According to MMRC, the TBM will be assembled in the next 45 days and then deployed for construction of 6.08 km twin tunnels between Siddhivinayak and Dharavi. The Earth Pressure Balance (EPB) device will be used to construct tunnels in circular cross section some 20 to 25 meters below the surface. With the arrival of first TBM, the corporation has kicked off tunneling activity, which is another most critical part of this project.
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