大跨连续钢桁拱桥吊索塔架系统设计与施工  

Design and Construction of Sling Tower System for Long-span Continuous Steel Truss Arch Bridge

作　　者：程建华 CHENG Jianhua(The 7th Engineering Co.,Ltd.,China Railway Major Bridge Engineering Group,Wuhan,Hubei430050,China)

机构地区：[1]中铁大桥局第七工程有限公司,湖北武汉430050

出　　处：《施工技术（中英文）》2024年第7期142-146,共5页Construction Technology

基　　金：中铁大桥局集团有限公司科学技术研究与开发项目(2018-24-重点)。

摘　　要：吊索塔架是大跨连续钢桁拱桥施工的关键临时结构。以江汉七桥钢桁拱桥施工为例,建立有限元模型,计算分析悬臂架设不同工况应力、挠曲及倾覆稳定性。采取工厂制造及现场预拼等施工措施,解决钢桁拱悬臂架设倾覆稳定和合龙问题。结果表明,通过合理设置塔高及吊索前后锚点,采取边跨压重、边支点锚拉等措施,使吊索塔架与拱梁协同受力,实现了大跨度钢桁拱悬臂架设结构内力均衡、抗倾覆性能好、线形控制好以及高精度合龙的目标,保证了钢桁拱施工安全。The sling tower is the key temporary structure in the construction of long-span continuous steel truss arch bridge.Taking the construction of steel truss arch bridge of Jianghan Seventh Bridge as an example,a finite element model is established to calculate and analyze the stress,deflection and overturning stability of cantilever erection under different working conditions.The construction measures such as factory manufacturing and on-site pre-assembly were adopted to solve the problem of overturning stability and closure of steel truss arch cantilever erection.The results show that by reasonably setting the tower height and the anchor points before and after the sling,taking measures such as side span weight and side fulcrum anchoring,the sling tower and the arch beam are subjected to synergistic force,and such goals as the internal force balance of the cantilever erection structure,good anti-overturning performance,good linear control and high-precision closure of the long-span steel truss arch are realized and the safety of the steel truss arch construction structure is ensured.

关 键 词：桥梁工程 连续钢桁拱 吊索塔架 悬臂架设 线形控制 设计 施工 

分 类 号：U445.4[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]