Recently, after 76 hours of continuous pouring, the main pier bearing platform of Qujiang Bridge of Chengda Wan High-speed Railway has been completed.
"In order to ensure that the mass pouring of the bearing platform is" excellent at one time ", after repeated research and demonstration by the expert team, we use the continuous pouring method of inclined plane layered pushing, and adopt the pouring technology of" zoning and fixed-point, one slope, step by step, one time to the end ". Cooling water pipes are buried when steel bars are bound, and part of the heat generated in the process of concrete pouring is taken away by water circulation to ensure the construction quality of the bearing platform. Gong Changhua, manager of the third work area of Chengda Wan Railway Project of the 15th Bureau of China Railway, said. In the early stage of
pile cap construction, the doctoral studio of Chengda Wan Project carried out the optimization of steel bar size and binding process of pile cap based on 4D-Bim, and the analysis of hydration heat temperature change characteristics of mass concrete under rock-socketed conditions, so as to ensure the smooth completion of the overall pouring of the main pier pile cap.
It is understood that as one of the control projects of Chengdu-Dazhou-Wanzhou High-speed Railway, Qujiang Bridge is located in Quxian County, a hilly area in the middle of Sichuan Province. It consists of two parts, the approach bridge and the main bridge, with a total length of 1983.81 m and a main span of 278 m. It is "the world's largest double-track high-speed railway prestressed concrete low-pylon cable-stayed bridge". The No.38 main pier bearing platform
poured this time is hexagonal, and the volume of concrete poured is 5688 cubic meters, which belongs to super-large volume concrete construction. Moreover, the main pier is constructed in water, the working surface is narrow, the temperature control measures are high, and the process is compact, which is a great test for the construction organization.
Chengdu Dawan high-speed rail starts in Chengdu and passes through Ziyang City, Suining City, Nanchong City, Dazhou City and Kaizhou District of Chongqing, with a total length of 477 kilometers and a design speed of 350 kilometers per hour. It is planned to be completed in 2027. After the completion of the project, the convenient passenger transport corridor from Chengdu to the Central Plains and the Beijing-Tianjin-Hebei region will become the "artery" of the high-speed rail connecting the Yangtze River Delta and the Beijing-Tianjin-Hebei region from the east to the north of Sichuan Province, which is of great significance to the implementation of the national strategies such as the construction of the Chengdu-Chongqing economic circle and the Yangtze River economic belt.
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