摘要
清水坪乌江大桥主跨为240 m的下承式钢桁梁柔性拱桥,拱肋结构跨度大、自重大、施工复杂。主拱肋采用“两端原位拼装+中间段先卧拼后整体提升”的施工方案,整体提升过程中设置水平索以控制主拱肋受力和变形,根据施工阶段的实际受力需求采取多工况提吊及水平张拉方法;具体介绍了拼装支架的布置和提升支架的结构。使用有限元分析软件进行模拟分析,保证了整体受力的安全性和抗风稳定性。施工中采用计算机控制液压同步提升技术,高效、经济、顺利的完成主拱肋架设工作。
The Qingshuiping Wujiang Bridge is a submerged steel truss girder flexible arch bridge with a main span of 240 meters,characterized by its large-span arch rib structure,substantial self-weight,and complex construction processes.The main arch rib adopts a construction scheme that involves"in-situ assembly at both ends and horizontal assembly of intermediate sections followed by integral lifting".During the integral lifting process,horizontal cables are installed to control the forces and deformations of the main arch ribs.Multi-stage lifting and horizontal tensioning methods are adopted based on the actual force requirements at different construction stages.This paper specifically details the arrangement of the assembly brackets and the structural design of the lifting brackets.Finite Element Analysis(FEA)software is utilized for simulation to ensure the safety of the overall structural forces and wind stability.Additionally,computer-controlled hydraulic synchronous lifting technology is implemented during construction to efficiently,economically,and smoothly complete the erection of the main arch ribs.
作者
许君辉
XU Junhui(Yuwan Railway Limited Liability Company,Chongqing 400037,China)
出处
《国防交通工程与技术》
2025年第1期86-91,共6页
Traffic Engineering and Technology for National Defence
关键词
钢桁梁-拱
柔性拱
主拱肋
整体提升
拼装支架
有限元分析
抗倾覆
steel truss-arch
flexible arch
main arch rib
integral lifting
assembly bracket
finite element analysis
overturning resistance
