部分斜拉桥线形控制及无砟轨道铺设技术研究

Research on Alignment Control and Ballastless Track Laying Technology of Extradosed Cable⁃stayed Bridge

针对高速铁路无砟轨道静态铺设精度要求高、大跨桥梁线形控制难度大的问题,本文以池黄(池州—黄山)高速铁路太平湖特大桥主跨2×228 m三塔部分斜拉桥为研究对象,建立有限元模型分析主梁刚度、斜拉索二次张拉次序、铺轨基准温度等设计参数对主梁线形的影响,提出主梁线形控制方案。结合现场条件全过程追踪无砟轨道铺设施工过程,逐级优化理论设计参数及主梁线形。轨道铺设完成后,实测轨顶标高与设计标高偏差值及轨道静态高低不平顺均满足无砟轨道静态铺设精度要求。

In response to the high precision requirements for static laying of ballastless tracks on high speed railways and the difficulty in controlling the alignment of long span bridges,Taiping Lake extra large bridge with a main span of 2×228 m three towers extradosed cable-stayed bridge on the Chizhou-Huangshan high speed railway was taken as the research object,and a finite element model was established to analyze the influence of design parameters such as the stiffness of the main beam,the secondary tensioning sequence of the cables,and the benchmark temperature of track laying on the main beam alignment.An alignment control scheme for the main beam was proposed.Based on the on-site conditions,the construction process of ballastless track laying was tracked throughout the entire process,and the theoretical design parameters and main beam alignment were optimized step by step.After the completion of track laying,the deviation between the top elevation of the track and the design elevation,as well as the static height unevenness of the track,were measured,and the results met the accuracy standards for static laying of ballastless tracks.