The right line of Weilai high speed railway successfully crossed Qingrong railway this morning, setting two domestic construction records

Qingdao, Dec. 25 (reporter Gao Zhongye, correspondent Zhang Ke, Shaoxia Xu) at about 1:00 a.m. on Dec. 25, the right line of Weilai high speed railway, constructed by China Railway 10th Bureau, crossed over the Qingrong railway super bridge with 120 + 82m steel truss beam smoothly. It is understood that the steel truss beam across Qingrong railway has created two new construction records in the history of domestic railway, i.e. fully welded weathering steel and large cantilever traverse. At 23:10 on December 24,

, at the construction site of the right track of Weilai high speed railway crossing Qingrong railway super major bridge, with the order of "transverse movement" of steel truss beam issued, the 120 + 82m steel truss beam with a weight of 2200 tons moved steadily at a speed of 13 meters per hour. After the completion of high-level assembly of steel truss beam far away from the existing line, China Railway 10th Bureau set up slide support on the left side of 31 × pier and 32 × pier line in advance, and the technical personnel on site guaranteed the accurate alignment of the transverse movement. After more than two hours of intensive construction, the steel truss beam moved 28m horizontally, successfully crossed the Qingrong railway, and realized the "large cantilever transverse movement" safely and stably.

according to Xu Shaoxia, chief engineer of Weilai high speed railway project of China Railway 10th Bureau, the 120 + 82m steel truss beam of the right line of Weilai high speed railway crossing Qingrong railway super major bridge is a key project as well as a control project. There are four new features of the bridge: first, in the selection of steel bridge materials, weathering steel is used for the whole bridge, which avoids the tedious coating and rust prevention measures of the previous steel bridge, reduces the workload and construction period, ensures the service life of the steel bridge, and greatly reduces the later operation and maintenance investment. Second, in the connection mode of steel beam, the full welding type is adopted, which completely rewrites the history of using a large number of bolts in the past steel bridge, effectively improves the risk of bolt falling off in the later stage of bolt connection bridge and the inconvenience brought by bolt replacement, and realizes the maintenance free of the whole bridge in a real sense. Thirdly, in the structural design of the steel beam, the bridge creatively adopts the 120 + 82m hyperbolic chord continuous steel truss beam + frame pier system to span the existing high-speed railway, which not only adds the overall stability of the bridge beam, effectively reduces the overall weight of the structure, but also reduces the construction safety risk. The overall structural system is the first in China and the world leader. Fourth, in the construction method of steel beam, the bridge adopts the construction method of dragging and moving under the condition of large cantilever to realize the crossing of existing high-speed railway. The portal pier crossbeam at the fulcrum of the steel beam adopts a single box three chamber box section with a box width of 5.0m and a box height of 4.5m, which is not only the permanent crossbeam of the portal pier, but also the temporary slideway support in the process of steel beam transverse movement, realizing the permanent temporary combination; the 82m end spans the existing high-speed railway by cantilever, ingeniously solving the problem of crossing the line, saving the slideway of the crossing line, and by optimizing the overall dragging system, the actual Now the cantilever of steel beam moves horizontally, which is an unprecedented construction method. The total length of the line is 122.187 km, the design speed is 350 km / h and the total investment is 16.133 billion yuan. It is planned to be completed and opened to traffic by the end of 2020. Since entering the site in February 2018, China Railway No.10 Engineering Group Co., Ltd. has successively won the first commencement, the first pile in Weilai, the first new laboratory, three mixing stations passing the one-time acceptance, the first new Beam Yard passing the acceptance, the first box girder erection, and the first construction of ballastless track, laying a solid foundation for the successful completion and opening of Weilai railway. By the end of 2020, when Weilai high speed railway is completed and opened to traffic, the distance between Jiaodong Peninsula and the western region of Shandong Province and Jinan, the capital of Shandong Province, will be shortened to two hours from Jinan to Yantai and Weihai. The two-hour circle of Shandong Province's rapid railway network planning will be realized, which will promote the development of county-level cities along the line, supplement the rapid passenger transport network of cities along the line, and strengthen regional connection The Department is of great significance.