长大混凝土桥梁无砟轨道温度跨度的研究

研究目的:大跨度混凝土桥上铺设无砟轨道和无缝线路是我国客运专线建设的关键技术之一,对桥梁和轨道工程都是一个严峻考验。对于长大混凝土桥上无缝线路,是否设置钢轨伸缩调节器是困扰长大混凝土桥上无缝线路设计的难题。本文对我国大跨度桥梁无砟轨道无缝线路设计进行研究分析。研究结论:通过对我国大跨度桥梁无砟轨道无缝线路设计研究分析和既有长大混凝土桥梁工点无砟轨道无缝线路运营情况现场调研发现;(1)铺设无砟轨道的大跨度混凝土桥梁温度跨度超过一定范围将引起轨道结构的病害;(2)通过在桥上采用小阻力扣件即减小桥上扣件的纵向阻力,可以降低钢轨最大纵向附加力及轨道结构的受力;(3)随着桥梁温差取值的增大,钢轨与桥墩受力及轨道和桥梁结构的变形都有明显增大;(4)必须加大大跨度桥上无缝线路监测的力度,加强无缝线路设计参数的试验研究。

Research on Temperature Span of Ballastless Track on Large-span Concrete Bridge

Research purposes: Laying the ballastless track and seamless track on the large is one of key technologies for construction of the passenger dedicated line in China and it is of a serious challenge to the bridge construction and laying ballastless track.It is a problem whether the rail overlapping device is installed or not in design of the seamless track on the large-span concrete bridge.This paper discusses the design of the ballastless track and seamless track on the large span concrete bridge. Research conclusions:From the research on design of the ballastless track and seamless track on the large span concrete bridge and the investigation of service situation of the existent seamless track on the large concrete bridge,the following points can be concluded:(1) If the track temperature span of large concrete bridge with the ballstless track exceeds the certain range,the disease will happen to the track structure.(2) The maximum longitudinal additional force of the rail and the load on the track structure can be reduced by cutting the longitudinal resistance of the rail fastening on the bridge by using the fastening with small resistance on the bridge.(3) The loads on the rail and the bridge pier and the deformation of the bridge structure increase obviously with the increase of the temperature difference of the bridge.(4) The monitoring of the seamless track on the large span bridge and the experimental research on the design parameters of the seamless track have to be strengthened.