大跨度上承式拱桥上无缝线路铺设方案研究  

Study on Laying Scheme of Continuous Welded Rail on Long-span Deck Arch Bridge

作　　者：颜乐[1] 魏贤奎[1] 王平[1] 

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,成都610031

出　　处：《铁道标准设计》2013年第11期6-10,共5页Railway Standard Design

基　　金：中央高校基本科研业务费专项资金资助项目(编号:2682013CX043)

摘　　要：基于桥上无缝线路尽可能避免使用钢轨伸缩调节器的原则,对国内某改建铁路线上大跨度上承式拱桥上无缝线路铺设方案进行研究,建立了线桥墩一体化拱桥计算模型,从3个方面入手优化设计方案:(1)铺设小阻力扣件;(2)采用速度锁定器;(3)局部降低锁定轨温。对各方案的伸缩力、挠曲力,以及梁轨快速相对位移、断缝值进行了计算和分析。综合比选5种方案后,铺设小阻力扣件为最佳方案;速度锁定器可以限制梁端位移,但在拱桥上的使用经验较少,降低锁定轨温不方便运营和管理;大跨度桥梁精确计算钢轨断缝值时,建议进行梁轨相互作用分析。In this thesis, based on the principle that the use of rail expansion joint on continuous welded rail should be avoided as far as possible, in regard to the continuous welded rail on a long-span deck arch bridge of a renovated railway in China, the laying scheme was studied. Meanwhile, a track-girder-pier integrative model was established, and the design scheme was optimized in three aspects ： （ 1 ） Laying the small resistance fastener; （2） Using the speed lock unit; （3） Locally dropping the rail stress-free temperature. Furthermore, the expansion force, flexure force, bridge-rail rapid relative displacement and the rail broken gap of every scheme were respectively calculated and analyzed, and comprehensive comparison among these schemes was carried out. It is concluded that： the scheme of laying the small resistance fastener is the best solution ; using the speed lock unit can limit the displacement of girder end, but its service experience in arch bridge is far less; reducing the rail stress-free temperature is not convenient to railway operation and management. In addition, it is suggested that the girder-rail interaction should be put into analysis when calculating the exact rail broken gap of a long-span bridge.

关 键 词：拱桥 无缝线路 设计方案 钢轨伸缩调节器 

分 类 号：U213.9[交通运输工程—道路与铁道工程]