高速铁路主跨450m斜拉桥应用无砟轨道可行性研究与设计优化  

Feasibility Study and Design Optimization of Ballastless Track for 450 m Main Span Cable-stayed Bridge of High Speed Railways

作　　者：李大成 LI Dacheng(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《铁道标准设计》2023年第2期24-29,共6页Railway Standard Design

基　　金：中国国家铁路集团有限公司科技研究开发计划课题(K2020G030);中国铁路设计集团有限公司科技开发课题(2021BXZ038)。

摘　　要：大跨度桥梁铺设无砟轨道现已成为扩大无砟轨道应用范围的又一技术难题,因此研究大跨桥上铺设无砟轨道的可行性十分必要。以某高速铁路主跨450 m大跨斜拉桥为例,针对无砟轨道应用的可行性及轨道结构设计参数进行研究,从而为大跨度桥上无砟轨道应用及结构设计提供理论依据。主要结论如下:(1)在大跨桥梁活载、温度等变形条件下,无砟轨道各静、动力学指标均能满足安全服役要求,主跨450 m斜拉桥应用无砟轨道可行;(2)温度组合荷载作用下,桥梁主跨竖向变形曲率半径最小值为191 771 m,满足行车舒适性要求;(3)橡胶弹性垫层可有效协调轨道结构层间变形,显著降低底座动力响应,建议弹性垫层刚度取0.10 N/mm^(3);(4)轨道板常用板型均满足层间变形不脱空要求,设计布板时应尽量选择板长较小的轨道板;(5)考虑桥梁成桥偏差影响,底座板厚度取220 mm,自密实混凝土层加厚至105 mm。Laying ballastless track on long-span bridges has become another technical problem to expand the application of ballastless track. Therefore, it is necessary to study the application feasibility of ballastless track on long-span bridges. Taking a long-span cable-stayed bridge with 450 m main span of a high speed railway as an example, this paper analyzes the feasibility of the application of ballastless track, and optimizes track structure design parameters, so as to provide a theoretical basis. The main research conclusions are as follows:(1) Under the deformation of long-span bridge due to ZK load and temperature, all static and dynamic indexes of ballastless track can meet the requirements of safe and good service, and it is feasible to apply ballastless track on cable-stayed bridge with main span of 450 m.(2) Under the combined temperature load, the minimum vertical deformation curvature radius of the main span is 191 771 m, which meets the requirements of ride comfort.(3) The rubber elastic cushion can effectively coordinate the interlayer deformation of the track structure, and significantly reduce the dynamic response of the track bed. It is recommended that the stiffness of the elastic cushion be 0.10 N/mm^(3).(4) The standard slabs meet the requirements of interlayer deformation and void-free. When designing the slab layout, the slab with small length should be selected as far as possible.(5) Considering the influence of bridge construction deviation, the thickness of base plate is 220 mm, and the self-compacting concrete layer is thickened to 105 mm.

关 键 词：高速铁路 大跨度斜拉桥 无砟轨道 静动力学特性 轨道几何不平顺 设计优化 

分 类 号：U213.9[交通运输工程—道路与铁道工程] U238