First Steel Girder Installed on Central Navigational Channel Bridge of China's Hangzhou Bay Sea-Crossing Railway Bridge

en.Wedoany.com Reported - On June 1, the first steel girder section of the central navigational channel bridge of the Hangzhou Bay Sea-Crossing Railway Bridge was successfully installed. The bridge was designed by China Railway Major Bridge Reconnaissance & Design Institute Co., Ltd. and constructed by China Railway Major Bridge Engineering Group Co., Ltd., both subsidiaries of China Railway Group Limited.

This bridge is currently the world's longest and highest-standard high-speed railway sea-crossing bridge under construction, serving as a key project of the newly built Nantong–Ningbo High-Speed Railway (Tongyong High-Speed Railway). The bridge has a total length of 29.2 kilometers, with a design speed of 350 km/h, and comprises three navigational channel bridges: north, central, and south. The central navigational channel bridge measures 1,430.8 meters in total length, with a main span of 2×448 meters, making it the world's largest-span ballastless track three-tower cable-stayed bridge. The bridge is equipped with 43 steel girder sections, with a total weight of approximately 22,700 tons. The first installed steel girder section is 28 meters long and weighs 449.2 tons.

Facing challenges such as large tidal ranges, rapid currents, frequent strong winds, complex navigation conditions, and short effective construction windows in the Hangzhou Bay waters, China Railway Major Bridge Engineering Group adopted a method of manufacturing full sections on land and transporting them by sea to the bridge site for installation. After the steel girder sections were fully manufactured at the Nantong base in Jiangsu Province, they were shipped to the bridge site. The construction team selected periods of high tide and stable water flow for operations, while simultaneously implementing measures such as weather warnings, traffic control, and precise adjustments to ensure the installation accuracy of the steel girders.

The Tongyong High-Speed Railway is a key component of the coastal corridor in China's "Eight Vertical and Eight Horizontal" high-speed railway network. The new line has a length of 301 kilometers and a design speed of 350 km/h. Upon completion, the project will connect multiple national-level railway trunk lines, optimize the railway network structure in the Yangtze River Delta, shorten the time and distance between cities along the route, and contribute to the high-quality integrated development of the Yangtze River Delta region.

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