高速铁路大跨度钢桁梁斜拉桥轨道型式研究

Research on the Track Type of Large Span Steel Truss Cable Stayed Bridge for High Speed Railway

研究目的:在总结铁路钢桥轨道结构应用的基础上,根据高速铁路大跨度钢桁梁斜拉桥和轨道结构特点,研究提出轨道结构选型原则,并对比分析有砟轨道、合成树脂枕轨道、板式无砟轨道、双块式无砟轨道的适应性,提出轨道结构选型建议。研究结论:(1)大跨度钢桁梁斜拉桥轨道结构选型应从轨道结构特性、施工性、维修性、综合经济性及环境性等方面综合考虑;(2)有砟轨道结构较为成熟,但结构自重大,养护维修工作量大,从寿命周期成本考虑,综合性能不高;双块式无砟轨道结构简单,自重较轻,但施工顺序对轨道线形有较大影响,对施工工艺要求高;(3)板式无砟轨道自重较轻,对钢桁梁桥适应性良好,且有一定的应用经验;合成树脂枕轨道结构简单、自重轻,维修工作量少,对钢桥适应性强,建议在高速铁路大跨度钢桁梁斜拉桥上研究采用合成树脂轨枕轨道和板式无砟轨道;(4)本文对高速铁路大跨度钢桁梁斜拉桥轨道结构选型有一定参考意义。

Research purposes： Based on summarizing the application of railway track for steel bridges, some principles of track type selection were proposed according to structural characteristics of track and high speed railway large span steel truss cable stayed bridge. With the proposed principles of track selection, ballast track, synthetic resin sleeper track, slab ballastless track and bi - block track were analyzed and compared, and recommendations for track type selection were proposed. Research conclusions： （ 1 ） Characteristics of different track structures, construction, maintenance, comprehensive economy and environment should be taken into account when selecting track for high speed railway large span steel truss cable stayed bridge. （2） Ballasted track is more mature but its weight is greater, maintenance workload is heavier, and in consideration of lifetime cycle cost, comprehensive performance of ballasted track is poorer. For bi - block track, its advantages include simple structure, lighter weight, etc. , but it has a greater impact on the track alignment, which makes higher demands for construction technology. （3） Slab ballastless track has lighter weight, good adaptability for steel truss bridge, and has been applied in overseas railway steel bridge. Synthetic resin sleeper track has simple structure, lighter weight, less maintenance and good adaptability for steel truss bridge. So, synthetic resin sleeper track and slab ballastless track are proposed for high speed railway large span steel truss cable stayed bridge. （4） The proposal in this paper can provide the reference to track type selection for high speed railway large span steel truss cable stayed bridge.