en.Wedoany.com Reported - At around 8:00 a.m. on June 29, as the final box girder, measuring 32 meters in length and weighing approximately 700 tons, was precisely placed onto the piers of the Hechuan East Station Extra-Large Bridge on the Xi’an-Chongqing High-Speed Railway, the box girder laying task for the Chongqing section was successfully completed, laying a solid foundation for the entire line to be completed and opened to traffic on schedule and with high quality.
The Xi’an-Chongqing High-Speed Railway is a key component of the Beijing-Kunming Corridor and the Baotou (Yinchuan)-Hainan Corridor within the national "Eight Vertical and Eight Horizontal" high-speed railway network. The main line within Chongqing spans approximately 170 kilometers, requiring the prefabrication and erection of 563 box girders. The Hechuan East Station Extra-Large Bridge, where the girder laying was completed, is located in Qingping Town, Hechuan District, Chongqing, with a total bridge length of 2,258.64 meters.
Hechuan East Station is entirely situated on the bridge, making it a typical high-speed railway station on a bridge. The bridge features a total of 5 continuous girder units with 29 spans of cast-in-place turnout continuous girders, presenting a complex span structure arrangement. Among them, the 22nd to 28th spans, a 196-meter turnout continuous girder, were constructed using full-space disc-buckle scaffold cast-in-place techniques, characterized by large pouring volumes, dense overlapping processes, and significant difficulty in scaffold installation and removal, imposing extremely high requirements on construction precision, safety management, and engineering quality standards. A total of 21 prefabricated box girders were erected across the entire bridge, effectively connecting the main line and turnout areas of the station. As the core load-bearing framework of the Hechuan East Station hub, the entire bridge supports the track, platforms, and ancillary waiting facilities along the entire line. The completion of the box girder laying provides a solid guarantee for subsequent bridge deck construction, ballastless track laying, and the overall formation of the station hub.
According to the person in charge of girder laying for the Xi’an-Chongqing High-Speed Railway project department of China Railway 14th Bureau Group, box girders are the core load-bearing structures of high-speed railway lines, analogous to the main beams and columns of a building, bearing all loads from the track. After the completion of ballastless track construction and rail laying, they will form a stable and reliable high-speed railway track foundation. In response to the actual conditions of the construction section, which is adjacent to existing railways, densely populated villages and towns along the route, and a complex environment, the project team improved graded emergency plans, assigned dedicated personnel for on-site supervision throughout the process, and consistently adhered to the bottom line of production safety. They successfully overcame multiple construction difficulties, such as the parallel operation of multiple lines at the station on the bridge and the narrow working space in the turnout area, ensuring the smooth and orderly progress of the girder laying operations.
Yao Yunxiao, Party Branch Secretary of the Dazhou Command of Jingkun High-Speed Railway Xikun Co., Ltd., stated that the Kangding-Chongqing section of the Xi’an-Chongqing High-Speed Railway is being accelerated. Currently, the girder laying projects for the Dazhou-Guang’an section and the Chongqing section of the Xi’an-Chongqing High-Speed Railway have been completed, 57 tunnels have been holed through, and the substructure of 218 bridges has been finished. The project is now fully entering the critical phase of girder laying, station construction, and the construction of the four power and electrical systems.
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