高速铁路特大跨度桥梁轨道静态几何偏差影响因素分析

Analysis on Factors Influencing the Static Geometric Deviation of Super-long-span Bridge Track of High Speed Railway

针对我国高速铁路特大跨度桥梁在验收阶段的桥梁和轨道变形特点,归纳了影响桥上轨道静态几何偏差的主要因素,从纵断面设置、环境温度、施工偏差及道砟容重偏差等方面探讨各影响因素的特征,提出高速铁路特大跨度桥梁的纵断面设置原则,并建议在验收阶段仍保持基准设计纵断面,将环境温度和施工偏差对轨道线形的影响视为长波不平顺,以轨面相对高程控制,可通过10、30和60 m中点弦组合标准管控特大跨度桥梁的轨道平顺性,建议组合标准为60 m弦限值6 mm、30 m弦限值3 mm和10 m弦限值1 mm,据此可确定轨道结构的目标线形,并在道砟厚度可调量-20~+100 mm内制定轨道精调方案。

Based on the characteristics of bridge and track deformation in the acceptance stage of super-longspan bridges of high speed railways in China,this paper summarizes the main factors influencing the static geometric deviation of track on bridges,discusses the characteristics of various influencing factors from the aspects of longitudinal profile setting,ambient temperature,construction deviation and ballast volume weight deviation,etc.,puts forward the setting principle of longitudinal profile for super-long-span bridge of high speed railways,and proposes to maintain the longitudinal profile of reference design in the acceptance stage and consider the influence of ambient temperature and construction deviation on track alignment as irregularity of long wave.By relative elevation control of rail surface,the track irregularity of super-long-span bridge can be managed and controlled through the combination of 10,30 m and 60 m mid-point chords.It is suggested that the combined mid-point chord measurement value be subject to the management standard:6 mm limit for 60 m chord,3 mm limit for 30 m chord,and 1 mm limit for 10 m chord.Accordingly,the target alignment of track structure can be defined,and the fine adjustment scheme of track can be established within the adjustable range of -20~+100 mm for ballast thickness.