National High-Speed Rail Corporation Limited (NHSRCL) on Friday mentioned Afcons Infrastructure Limited quoted the decrease quantity amongst two technically certified monetary bids for the development of a 21-kilometre tunnel, together with 7 kilometres underneath the ocean, as a part of the Mumbai-Ahmedabad bullet train challenge.
NHRSCL mentioned it had obtained bids from Afcons Infrastructure Limited and Larsen & Toubro Limited for developing the tunnel that may stretch from the proposed underground station at Bandra Kurla Complex in Mumbai to Shilphata in neighboring Thane district.
New Austrian Tunnelling Method getting used
“The tunnel will be a single-tube twin-track tunnel having a diameter of 13.1 metres. Out of 20.37 km, 15.42 km of tunnelling will be carried out with three TBMs (Tunnel Boring Machine) and the remaining 4.96 km will be built using New Austrian Tunnelling Method (NATM). The depth of the tunnel will vary from 25 metres to 65 metres,” the NHRSCL mentioned in a launch.
“The tunnel will cross Thane creek and the survey work underneath the creek was carried out utilizing underwater static refraction method.
The deepest development level might be 114 metres under Parsik Hill close to Shilphata,” an NHSRCL spokesperson mentioned.
TBMS with a cutter head of 13.1 metre diameter might be used, a lot bigger than the 5-6 metre diameter cutter heads used for metro rail programs and so forth, the spokesperson added.
Total price Rs round 1 lakh crore. The excessive pace hall between Mumbai and Ahmedabad is arising at a value of Rs 1.08 lakh crore.
While the dominant a part of the price is roofed by a mortgage from Japan, the remaining might be contributed by the Union authorities and the governments of Maharashtra and Gujarat.
(With PTI enter)
