By Lynda Myer
The underground section of Marina Beach to Kodambakkam Flyover corridor is split into two packages (UG-01 & UG-02) each of which contains 4 km of twin tunnels. Considering both Upline & Downline tunnel, completion of almost 16 km of tunneling was up to four TBMs that have been proposed to execute the entire tunneling.
Being operated by CMRL’s contractor M/s ITD Cementation India Limited, these TBMs manufactured by Herrenknecht and the Factory Acceptance Test of the 2nd TBM was successfully completed on April 1st, 2023 while it is the 1st for UG-02 package.
Current destination of this intended TBM EPB, which’s name is S1074B and is 6.67 m in diameter, 110 m long and weighs approximately 700 t, will be at Panagal Park Station, T Nagar. As a part of X-Over structure, the construction process of TBM launching Shaft is under progress at Panagal Park Station and is scheduled to be inaugurated and assemble the TBM in October 2023.
The commissioning location of this TBM will be Downline of this corridor-4 and is due to drive at a maximum depth of 29 m beneath ground level starting from Panagal Park through Nandanam and finally it is planned to arrive at Boat Club by September 2024.
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