en.Wedoany.com Reported - Recently, the first railway bridge box girder for the Yichang-Fuling High-Speed Railway Chongqing Section, Lot 8, undertaken by China Railway Group First Engineering Bureau, was successfully cast at the Changshou North Right Connecting Line Super Major Bridge. This first box girder cast is a 32.6-meter single-track prestressed simply supported box girder, constructed using the MSS32 upward movable formwork system for cast-in-place in-situ construction.

The formwork system has a self-weight of approximately 280 tons and features a high degree of mechanization, excellent safety performance, and strong terrain adaptability. It can efficiently complete the cyclic operation of in-situ casting of railway bridge box girders and formwork launching, solving complex construction challenges for multiple railway bridges on the project, such as crossing roads and proximity to existing railways. To ensure the smooth casting of the first box girder, the project department completed all preparatory work in advance, including formwork assembly, graded preloading, and system commissioning. A preloading test was conducted at 1.2 times the construction load to accurately determine elastic and non-elastic deformations and scientifically set the camber.

During the casting process, the project department strictly implemented safety penetration management, conducted safety and technical briefings, and carried out item-by-item acceptance checks for key links such as lifting equipment, hydraulic systems, and electrical systems. Management personnel supervised the entire process, while technical, safety, and testing personnel were on duty to strictly control the quality of every step, including concrete mixing, transportation, casting, and vibration, employing the "symmetrical distribution, layered casting" technique. After continuous operation, the first railway bridge box girder was successfully formed, with all indicators meeting design and specification requirements.

The Yichang-Fuling High-Speed Railway Chongqing Section, Lot 8, covers a total length of 26.059 kilometers, with a bridge-tunnel ratio as high as 85.8%, requiring the completion of 182 spans of movable formwork cast-in-place beams. The successful casting of this first span marks the official entry of the railway bridge construction into a new phase of large-scale superstructure construction.

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