富春江特大桥轨道高低长波不平顺评估  

Evaluation of track long-wave vertical irregularity on Fuchun River super large bridge

作　　者：李秋义[1,2] 赵云哲 谢晓慧 LI Qiuyi;ZHAO Yunzhe;XIE Xiaohui(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;Key Laboratory of Hubei Province for Railway Track Safety Service,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063 [2]铁路轨道安全服役湖北省重点实验室,湖北武汉430063

出　　处：《铁道科学与工程学报》2022年第11期3217-3224,共8页Journal of Railway Science and Engineering

基　　金：国铁集团科技开发计划项目(2015G001-G)。

摘　　要：现行规范中高速铁路轨道静态长波不平顺采用300 m基线长矢距差法评估,其限值为10 mm。由于温度荷载、二期恒载和徐变等多种因素的影响,跨度200 m以上桥梁的垂向变形较大,轨道静态长波不平顺难以满足规范要求,现行规范的矢距差法已不能适应大跨度桥梁及轨道技术发展的需求,采用适用大跨度桥梁的轨道静态长波不平顺评估方法非常必要。针对湖杭铁路富春江特大桥(30+46+300+97+62.395) m高低塔钢混组合梁斜拉桥,选取桥梁理论变形、实测线形以及实测线形+升温/降温最不利工况变形,对无砟轨道静态长波不平顺采用300 m基线失距差法和60 m弦中点弦测法进行评估,大桥的理论线形和实测线形静态长波高低不平顺300 m基线最大测量值分别为69.07 mm和63.56 mm,60 m弦最大测量值分别为6.73 mm和6.56 mm。研究结果表明:该桥理论线形、实测线形的300 m基线长高低不平顺均不满足10 mm限值要求;60 m弦中点弦测法高低不平顺能满足7 mm限值要求。富春江特大桥静态长波不平顺静态验收,可采用60 m弦长中点弦测法测量,限值取7 mm,为主跨200 m以上的大跨度桥无砟轨道高低静态长波不平顺验收和管理提供了理论支撑。Acceptance standard of long-wave static irregularity for ballastless track of high speed railway adopts 300 m baseline length method which limit is 10 mm. However, this index is hard to satisfy due to the influence of temperature load and secondary dead load as well as creep or other factors which can cause large vertical deformation on the bridge over 200 m. At present, it’s necessary to adopt appropriate method of evaluation of track long-wave static irregularity for the development of long-span bridge and track engineering which is different from the current vector distance difference method. The research on the 300 m baseline length and 60 m midpoint chord measurement long-wave static irregularity of Fuchun River bridge,(30+46+300+97+62.395) m composite steel-concrete beam cable-stayed bridge, wass studied in this paper which considered theoretical vertical deformation, measured values of track elevation and measured values considering disadvantage temperature condition. The above condition results of long-wave static irregularity respectively are 69.07 mm,63.56 mm for 300 m baseline length and 6.73 mm, 6.56 mm for 60 m midpoint chord. The research shows that 300m baseline length long-wave static vertical irregularity can’t satisfy 10 mm limit value, while 60 m midpoint chord measurement can meet its 7 mm limit value on theoretical vertical deformation and measured values conditions. It is suggested that acceptance standard for ballastless track long-wave static irregularity of Fuchun River bridge adopts 60 m midpoint chord measurement and its limit value should be 7 mm which provides reference for the long-wave static vertical irregularity acceptance standard of ballastless track on the large bridges over 200 m.

关 键 词：大跨度桥 无砟轨道 长波不平顺 中点弦测法 

分 类 号：U213.2[交通运输工程—道路与铁道工程]