On February 3, 2021, after 264 days of continuous struggle, the steel-concrete composite continuous box girder bridge of Fenghuangling bridge in Liuzhou City, Guangxi Province, which was constructed by Shanghai Bureau of China Railway, participated by China railway industry, and monitored by China Railway Bridge Research Institute, was successfully completed With the successful completion of the most critical and difficult construction process of the project, the bridge construction has been officially transferred to the bridge deck construction stage, laying a solid foundation for the completion and opening of the project on schedule.

China Railway Baoqiao, a subsidiary of China railway industry, is responsible for the steel structure manufacturing of Fenghuangling bridge in Liuzhou. Among them, the main beam of the bridge is 700 meters long, and the total weight of the beam is about 18600 tons. The walking type pushing construction technology is adopted, and the maximum pushing span is 130 meters. Due to the large weight of launching and the increasing distance of launching, it is difficult to control the elevation in the process of installation and launching, which easily leads to the deformation of beam body and the deviation between the actual alignment and the virtual alignment. For this reason, the project department started with the scheme, adopted the optimal configuration scheme of "guide beam + tower + cable-stayed buckle", introduced multi-point self balancing walking type pushing equipment, and solved the problems of large downward deflection and stress concentration at the root of cantilever under 130m long-span pushing.

At the same time, the technical team of bridge and tunnel technology company of China Railway Bridge Research Institute has adopted the patent technology of "adaptive rotation control of the main beam of complex vertical curve bridge" to strictly control the relative elevation of each support and the tension of the temporary cable during the pushing process, so as to ensure that the internal force of the main beam, guide beam and temporary tower and the reaction force of each support are within the controllable range, and ensure the structural stress safety Bridge construction escorts.

It is reported that Liuzhou is known as the "Bridge Museum". Up to now, more than 20 large and small river crossing bridges have been built, including the "wanghong bridge" Baisha bridge and Guantang bridge, which are constructed by China Railway Shanghai Bureau. Video column Director / Liu Lu