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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 characteristics of transitional section between slab and ballastless track, four kinds of transitional plan of slab-slab structure are proposed and the finite element model is established. The influence of the slab’s emptying length on rail stress is analyzed, and the structural design of transition section between slab and rail is optimized. Setting the slab transition scheme can improve the ride comfort, reduce the type of track plate and optimize the force on the track plate. However, the different slab layout has a great influence on the stress of the track structure. It is considered that the slab is placed at a certain distance from the abutment, the slats are aligned with the slab seams above the upper board, and the base is continuously laid. The plan of setting the rigid foam board is the optimal solution; the slab void is greatly affected by the force of the slab and the rail structure, and the design of the slab and the base above it should be strengthened.