
Work set to begin on 1.7-km underground leg of Yellow Line
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Kolkata: The second phase of the underground Yellow Line beyond the airport to Birati is set to begin with the engineering firm—which built the underground packages for the East-West Metro—securing a Rs 1,330-crore contract.
ITD Cementation's job includes construction of twin tunnels, each 1.7 km long, the underground Birati station and subways for Birati and Michael Nagar stations on this stretch of the 11.2-km Noapara-Barasat Metro corridor.
The Yellow Line's first phase— the 7-km section from Noapara to Jai Hind (airport) stations—is complete and ready for safety inspections by the Commission of Railway Safety (CRS), which grants the approval for revenue operations.
For the second phase, ITD Cementation recently emerged as the lowest bidder for the civil construction contract.
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Metro Railway had floated the tender for in Aug 2024, with a timeframe of 910 days or around two-and-a-half years. The bid was invited weeks after the Airports Authority of India (AAI) allowed the use of 18-m-tall cranes for the work on the airport-New Barrackpore stretch. AAI also granted Metro Railway the much-awaited NOC to start work between the airport and Michael Nagar.
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Being on the flight path of planes near the northern end of the main runway, the corridor has been riddled with several obstacles.
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"The contractor (ITD Cementation) will be responsible for the construction of 3.5-km Metro tunnels (1.7 km each), the underground Birati station and subway work for Birati and Michael Nagar stations," a Metro official said.
The tunnel next to the airport's wall will be built, using the RCC box pushing method (without the deployment of tunnel boring machines), as specified by the AAI, while the Birati station will be constructed using the cut-and-cover method.
The cut-and-cover method is a shallow, tunnelling technique, in which a trench is excavated, the tunnel structure is built, and the trench is then covered and restored to the original surface.
The method is used when the tunnel's depth is relatively shallow and the surface disruption is acceptable.
"The contractor will also be responsible for the architectural finishing, firefighting, water supply, sanitary installation, power supply system and aluminium third rail among other facilities," a Metro official said. "We hope the rest of the Yellow Line issues will be resolved and funds will flow accordingly."

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