Beibei Tianfu Jialing River Grand Bridge on the Xi'an–Chongqing High-Speed Railway Completes Closure

en.Wedoany.com Reported - On November 8, the main bridge of the Beibei Tianfu Jialing River Grand Bridge on the Xi'an–Chongqing High-Speed Railway completed closure, with the final pour of concrete finished. Located in Beibei District, Chongqing, the bridge has a total length of 874.35 meters and a main span of 216 meters, making it the longest-span bridge in the Chongqing hub section of the Xi'an–Chongqing High-Speed Railway. It was designed by China Railway Eryuan Engineering Group and constructed by China Railway 11th Bureau Group. The closure completes the key structural construction of the main bridge crossing the Jialing River, and the project will move on to subsequent bridge deck and related supporting works.

The Beibei Tianfu Jialing River Grand Bridge adopts a cable-stiffened continuous rigid-frame structure, with a main bridge span arrangement of 106 meters, 216 meters and 106 meters. The main span crosses the Jialing River, while the side spans on both sides cross National Highways G351 and G212 respectively. The bridge is located in the Guanyinxia area of Beibei District, where construction is affected by riverside and cliffside terrain, complex geological conditions, water level changes during flood season and navigation management, making the organization of river-crossing construction and high-altitude structural installation highly challenging.

The main bridge was constructed using the cantilever casting method, and the construction team introduced an intelligent cantilever bridge-building machine to replace part of the traditional manual form traveler operations. The equipment integrates automatic traveling, automatic formwork opening and closing, and concrete curing spraying functions, and can support segmental casting of the main girder. The project team also used automated measurement equipment to monitor the main girder alignment, structural stress and stay cable tensioning parameters, and employed dedicated positioning tooling to control the embedded positions and installation accuracy of the stay cables.

According to information disclosed by the construction contractor, after the intelligent cantilever bridge-building machine was put into use, the related cantilever construction period is expected to be shortened by about 20%, and on-site personnel reduced by about 20%. For closure accuracy control of the main bridge, the construction team coordinated the alignment and stress state of the cantilever structures on both sides through main girder stress-strain analysis, stay cable force monitoring and a dedicated construction control plan, completing the closure of the river-crossing main bridge.

The Beibei Tianfu Jialing River Grand Bridge is an important controlling project in the Chongqing hub section of the Xi'an–Chongqing High-Speed Railway. Following the bridge closure, subsequent work remains to be advanced, including the bridge deck system, ancillary structures and related line works, as well as connections with adjacent subgrade, bridge and track works.

The main line of the Xi'an–Chongqing High-Speed Railway is approximately 739 kilometers long and is being built in two sections: Xi'an–Ankang and Ankang–Chongqing, along with an approximately 90-kilometer connecting line from Fanxai via Kaizhou to Wanzhou. The Ankang–Chongqing section has a main line length of approximately 478 kilometers, starting from Ankang West Station in Shaanxi Province in the north and passing through Dazhou, Guang'an and other places in Sichuan before entering the Chongqing hub and connecting to Chongqing West Station. Once completed, the line will connect with the Chengdu–Chongqing High-Speed Railway, Zhengzhou–Chongqing High-Speed Railway and Chongqing–Kunming High-Speed Railway, forming a high-speed railway corridor between Xi'an and Chongqing.