MUMBAI (Metro Rail News): On 7 June 2023, NHSRCL and Afcons Infrastructure Limited signed a Contract for the construction of a 21-kilometre-long rail tunnel which includes a 7-kilometre undersea tunnel at a cost of Rs6,397 crores in Maharashtra for the Mumbai- Ahmedabad-high-speed rail corridor under the MAHSR C-2 Package.
According to the information, the technical and financial bids for the project opened on 9 February 2023 and 6 April 2023, respectively.
Following the contract, the managing director of NHSRCL, Rajendra Prasad, informed that the construction of a 21 km long rail tunnel is the most challenging and significant contract for the Mumbai– Ahmedabad-high-speed rail corridor as it includes the country’s first twin-track 7 km undersea tunnel construction at Thane Creek (Intertidal Zone).
Three TBM (Tunnel Boring Machine) and the New Austrian Tunneling Method (NATM) will be used to construct this tunnel to make it successful. The tunnel track will extend between the underground station at the Bandra-Kurla complex and the Shilphata station. The 16 Km tunnelling will be done through the three TBMs at BKC (under package C1), Vikhroli, and Sawli with an approximate depth of 36, 56, and 39 Metre, respectively and for the rest 5 km NATM will be used at Shilphata.
TBMs with a Cutter head of 13.1 metres in diameter will be used because the tunnel will be a single tube to accommodate twin tracks for both up and down tracks. As part of the agreement, 39 equipment rooms will also be built at 37 locations adjacent to tunnel locations.
As per the NHSRCL official information, the agreement was signed on 20 March 2023 for Mumbai HSR station (MAHSR Package C1), and the construction of the double line of Tunnel between Mumbai HSR station to Shilphata signed on 8 May 2023.
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