en.Wedoany.com Reported - In the early hours of June 8, the left and right lines of the Textile Factory Bridge on the Chengdu-Dazhou-Wanzhou High-Speed Railway (Chengda-Wan High-Speed Railway) in Wanzhou District, Chongqing, completed the precise installation of the final steel box girder, achieving a full connection. This is a key control project in the Three Gorges Reservoir area, undertaken by China Railway No.3 Engineering Group Co., Ltd. The bridge has a total length of 392.81 meters, accumulating experience for China's high-speed railway construction adjacent to existing lines in complex environments.
The left and right lines of the Textile Factory Bridge are control projects for the entire Chengda-Wan High-Speed Railway, located adjacent to the Zhengzhou-Chongqing High-Speed Railway (Zheng-Yu High-Speed Railway) Textile Factory Four-Line Bridge, which sees nearly 160 trains passing daily. Constrained by multiple factors such as routes, geography, and stations, the two railway bridges adopted a "limit-adjacent" construction mode, with a minimum clear distance of only 0.16 meters. The construction team faced challenges including limited working space, narrow bridge decks, high piers, restricted tensioning, and concentrated safety risks.
Li Dachang, Chief Engineer of the 16th Bid Section Command of the Chengda-Wan High-Speed Railway under China Railway No.3 Engineering Group Co., Ltd., introduced that over six days, the project team installed four simply supported steel box girders with a total weight of 491.2 tons. Given the characteristics of ultra-long and ultra-heavy steel box girder segments and high assembly precision requirements, the technical team optimized and formulated a comprehensive construction plan involving factory segment manufacturing, on-site assembly using a 260-ton truck crane, and overall hoisting with a 500-ton crawler crane, achieving "zero interference" with the operation of existing lines.
The bridge had previously completed cast-in-place construction of a 57-meter ultra-high support. The final four spans of the bridge deck adopted a steel box girder hoisting process. Facing adverse weather conditions such as frequent rain and heavy fog, the project team resolved challenges one by one, including welding in confined spaces and high-altitude operations, achieving zero safety incidents and stable monitoring data. Through minute-level precise management of skylight operations and optimization of large hoisting equipment working conditions, they successfully overcame the difficulty of hoisting large-tonnage steel box girders adjacent to operating lines.
Zhang Zongwei, Commander of the Dazhou Construction Command of Chengda-Wan High-Speed Railway Company, stated that the left and right lines of the Textile Factory Bridge are key projects for connecting the Chengda-Wan High-Speed Railway to the Chongqing-Wanzhou Intercity Railway and linking with the Zheng-Yu High-Speed Railway network. The precise alignment of the steel box girders with the reserved interfaces of the existing lines marks the full completion of the bridge's substructure construction, achieving a seamless and smooth connection between the new line and the existing railway network. The bridge's connection has opened up an important girder erection channel within the bid section, creating prerequisites for subsequent full-line track laying, joint commissioning and testing, and operational preparations.
The Chengda-Wan High-Speed Railway is a vital component of the Yangtze River Corridor within the national "Eight Vertical and Eight Horizontal" high-speed railway network. Once completed, it will form a rapid passenger transport corridor from Chengdu directly to the Central Plains and the Beijing-Tianjin-Hebei region, providing significant support for the implementation of national strategies such as the Chengdu-Chongqing Dual-City Economic Circle and the Yangtze River Economic Belt.
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