摘要
根据单元板式无砟轨道路桥过渡段特点,提出4种搭板结构过渡方案,建立有限元模型,分析搭板脱空长度对轨道受力的影响,优化了单元板式轨道路桥过渡段的结构设计。设置搭板过渡方案可提高线路的平顺性、减少轨道板类型和优化轨道板受力。但不同的搭板布置对轨道结构受力影响较大,分析认为将搭板置入桥台一定距离,搭板两端和上方轨道板板缝对齐,底座连续铺设,并在搭板近台端上方设置硬泡沫塑料板的方案为最优方案;搭板脱空对搭板及轨道结构各项受力影响很大,应加强对搭板及其上方底座的设计。
According to the structure characters of approach slab at roadbed-bridge transition section of slab track, four structural schemes of approach slab are given, and a finite element model of approach slab is established. The mechanics of slab track corresponding to each approach slab scheme is analyzed and compared between them, and the optimal scheme was proposed. In addition, the impact of approach slab unsupported-length on the mechanics of slab track was analyzed. The conclusion can provide the support for the design of roadbed-bridge transition section of slab track. Approach slab can improve the regularities of the track, reduce the types of slab and optimize the mechanics of slab track. However, approach slab position has large impact on the mechanics of slab track. According to the analysis results, the optimal scheme is characterized by approach slab placed on abutment, two ends of the approach slab aligned with the slab edge above, continuous bed pate and rigid foam panel set above the end-near-abutment of approach slab. Besides, the unsupported - length of approach slab has huge impact on the mechanics of slab track and itself, and the design of approach slab and bed plate above should be enhanced.
出处
《高速铁路技术》
2011年第6期10-14,共5页
High Speed Railway Technology
关键词
板式轨道
路桥过渡段
搭板
slab track
roadbed-bridge transition section
approach slab
