The much-awaited girder-launching or construction of superstructure of the new Tallah road overbridge (ROB) has started.
State PWD, the implementing agency, is chasing a mid-2022 deadline to complete the Rs 350 crore Tallah bridge reconstruction project. PWD engineers and contractors L&T are working on a war-footing to complete erection and launching of girders to build the bridge deck.
PWD’s principal secretary, Onkar Singh Meena, told TOI, “The girder-launching is on in full swing, even at night, despite the ongoing Covid situation which has several labourers infected. The railways have allowed power and traffic blocks so that the spans can be launched over the tracks.”
The 60-year-old bridge was pulled down in April, 2020, because it had worn beyond repair. Construction of the bowstring four-lane bridge began in August. On December 9, the last milestone was achieved as the commissioner of railway safety (CRS) gave its nod for girder launching. CRS, the autonomous body under the ministry of civil aviation, clears any new railway project across the country.
The new Tallah bridge is actually a road overbridge (ROB) under Eastern Railway’s ambit. A 240m section of the 750m structure will stand over the Tallah railway tracks operated by ER. Six piers each on the Shyambazar and the Dunlop end and another six in the middle will support the deck slab over the railway tracks.
The superstructure will be a continuous girder system spanning the railway tracks, built with the launched-girder erection technique or sequential erection of the girders one after the other, using high-capacity cranes. “Construction of two spans (between piers 7 and 8 and between piers 8 and 9), on the railway tracks, by the girder-launching, is the most crucial part of the project,” said an engineer.
Source: Times of India