About 100 workers, skilled and unskilled labours, will be employed to dig through the 2.07-km long-twin tunnels.
The tunnelling work of the 10.58-kilometre-long Coastal Road has begun in Mumbai and is expected to be complete by 2023. Built under the authority of the Birhanmumbai Municipal Corporation, this road will link the Princess Street Flyover and Worli, easing the traffic load burdening over Nariman Point to Bandra. The civic body has slated the groundwork to finish off in 18 months time, where a total of 100 workers including technical persons, skilled and unskilled labour will be engaged in burrowing the tunnels, on all days for 24 hours. These working hours and labour strength have been employed in order to complete the project on time.
India's largest TBM 'Mavala' to burrow the Coastal Road tunnels
The parent authority of the project, BMC has pitched the tunnelling work to complete by June 2022 to flag off the road for public use by mid-2023. The time-line of the project has allotted 9 months to dig through the tunnel on each side, up towards South Mumbai & downward to Worli end.
As per the plan, India's largest tunnel boring machine, 'Mavala' will be used to dig through a 3.45-kilometre twin-undersea area to initiate the first phase of the project, between the Priyadarshini Park to Girgaum Chowpatty. Imported from China, this machine has a diameter of 1.21 meters and about 17 trucks were required to transport the dismantled parts to the work-site in April last year. However, due to the unforeseen troubles of the coronavirus, any pivotal work was delayed.
The Coastal road will have two lanes, each 3-3.2 meter wide with one emergency lane, which averages the width of each tunnel around 12 meters. As per the plans, the Mavala will operate 25 meters below the surface at Girugaum Chowpatty and 75 meters below the mean surface at Malabar Hill.
As per the BMC, about 20% of the work has been completed till now and factoring time as the primary essence of the entire project, the road is to get functional by mid-2023. This will set the Worli and Nariman Point minutes apart, promoting ease of commute while decongesting the city roads.