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India’s longest sea bridge set to be launched this week

This week marks the imminent launch of Atal Setu (Mumbai Trans Harbour), India’s longest sea bridge spanning 22 kilometers and connecting Mumbai to Navi Mumbai within a swift 20-minute journey. This engineering marvel, under construction since 2018, introduces pioneering materials and technology previously unseen in India.

The six-lane bridge, commencing from Sewri in South Mumbai, traverses Thane Creek, culminating at Chirle in Navi Mumbai, erected at an approximate cost of ₹17,843 crore.

Engineered for a speed of 100 km/h, accommodating 70,000 vehicles daily, the bridge comprises a 16.5 km marine section and a 5.5 km elevated road on land, leveraging advanced Japanese technology. Employing Orthotropic Steel Decks (OSD) capable of standing sans piers and facilitating seamless ship passage marks a pioneering use in the nation. Nearly 70 OSDs, a few assembled onshore at the Sewri site, were transported mid-sea and installed on the Mumbai Trans Harbour Link.

Moreover, an 8.5 km noise barrier shields the flamingos from the bridge’s traffic.

Larsen & Toubro (L&T), part of the trans harbour link’s construction, installed a 3.5-meter view barrier atop a 1.5-meter guard wall to shield Bhabha Atomic Research Centre (BARC) from public view. Additionally, noise barriers measuring 2.1 meters atop one-meter guard walls were installed on both sides at the Sewri end.

Atal Setu, fortified to withstand earthquakes, high tides, and wind pressure, boasts distinctive materials, including flow-filled epoxy-coated strands akin to those used in nuclear reactor construction. These materials promise robust corrosion protection, durability, and resilience against chloride attacks.


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