Southeast Asia Information Port News (www.dnyxxg.com) – On the 24th, amidst the vast expanse of blue water, the construction of the South Channel Bridge of the Hangzhou Bay Cross-Sea Railway Bridge reached a new milestone: the concrete pouring of all 159 main towers was completed, successfully achieving the topping-out ceremony for both towers.
On the day of the topping-out ceremony, the project team of 15 builders worked continuously for more than 10 hours on intelligent hydraulic climbing formwork, successfully completing the construction of the final section of the main tower.
The South Channel Bridge is 814.5 meters long, with a main span of 364 meters. It adopts a steel truss combined with beam cable-stayed bridge structure. The two main towers are 157.5 meters high, divided into 29 sections for construction, equivalent to the height of a 56-story building. Above the bridge deck, it has a smooth inverted Y-shape, converging into a diamond shape below the deck. The final section, 4.8 meters high, required the pouring of 120 cubic meters of C55 concrete.
With the twin towers erected, the construction of the superstructure, including the steel truss beams, will commence in full swing. Next, the intelligent hydraulic climbing formwork at the top of the main tower will be dismantled, and the erection of the steel truss girder on the north side will begin simultaneously. The steel truss girder of the South Channel Bridge is designed to be divided into 29 segments, with a total weight of approximately 10,673 tons. All segments were manufactured and assembled into 10 large segments at a specialized steel beam factory before being transported by ship to the bridge site for installation. The largest segment is 100.8 meters long and weighs approximately 1,291 tons. The stay cables will also be installed simultaneously with the steel truss girder segments. According to the plan, the South Channel Bridge will complete the erection of all steel truss girders by mid-July and achieve closure around September 10th.
Since the first steel casing pile was driven in August 2023, the main bridge team of CCCC Second Harbor Engineering Co., Ltd. has been working continuously for nearly 700 days. Facing Hangzhou Bay, one of the world's three strongest tidal bays, the project team overcame the harsh sea conditions of large tidal ranges and rapid tides, as well as the complex geological conditions of repeated strong scouring and siltation. Through a series of innovative methods, the team successfully tackled challenges such as ultra-deep, large-diameter bored piles, lowering 2,500-ton deep-water steel caissons, intelligent temperature control of large-volume concrete, and linear control of high-altitude irregular-shaped tower columns. They innovatively applied an intelligent hydraulic climbing formwork system, integrating formwork support, intelligent climbing, spray curing, and stress displacement monitoring, achieving safe, high-quality, and efficient construction of the variable-section ultra-high tower columns, ensuring that the two diamond-shaped tower columns stand firmly in the middle of the sea.
The Hangzhou Bay Cross-Sea Railway Bridge is a key project of the Tongyong High-Speed Railway, with a total length of 29.27 kilometers and a design speed of 350 kilometers per hour. It is currently the world's highest-standard and longest high-speed railway cross-sea bridge under construction. The completion of the South Channel Bridge provides strong momentum for the bridge's timely completion and opening to traffic. Upon completion, the project will further shorten the spatial and temporal distance between core cities in the Yangtze River Delta, and will be of great significance to building a "Yangtze River Delta on rails" and promoting high-quality regional integration. (End)
