大跨梁、简支T梁铺设无碴轨道的可行性

研究目的:利用新北碚嘉陵江大桥作大跨度连续梁桥及简支T梁上铺设无碴轨道的研究,意在突破大跨度桥及简支T梁上铺设无碴轨道的瓶颈,这对我国客运专线无碴轨道铁路的发展将具有极其重要的意义。研究方法:采用理论与实桥试验研究相结合的方法。建立轨—板—桥—墩一体化空间计算模型,线路纵向考虑钢轨、轨道板和底座板、桥梁等的相互作用。施工时安放测试原件,测试验证理论计算参数。研究结果:通过对在建的遂渝线新北碚嘉陵江大桥(94 168 84)m预应力混凝土连续刚构及其引桥24 m、32 m简支T梁上铺设无碴轨道的可行性进行了研究,确定了连续刚构及简支T梁上的无碴轨道铺设方案。研究结论:通过研究认为,在主跨168 m的预应力混凝土连续刚构及其引桥24 m、32 m简支T梁上铺设无碴轨道是可行的,拓宽了无碴轨道的适用范围,为我国客运专线无碴轨道铁路的发展积累了新的理论成果。

Feasibility of Laying Ballastless Track on Long-span Continuous Beam Bridge and T-beam Bridge

Research purposes: The purposes are to break though the choke point of laying ballastless track on (long-span) continuous beam bridge and T-beam bridge through making research on feasibility of laying ballastless track on Xinbeibei Jialing River Bridge,which is far-reaching significant to development of ballastless track on passenger dedicated line in China.Research methods:The integrative space calculation model of rail-slab-bridge-pier is established by adopting the method of combining theory with trial research.The interactions of rail,slab,support layer and bridge are taken into consideration to the longitudinal direction of track.When the construction begins,the original test pieces are put on(construction) site in order to testify the theoretical calculation parameters.Research results:The program of laying ballastless track on continuous rigid structure and simply supported T-beam is decided through making research on the feasibility of laying ballastless track on prestressed concrete continuous rigid structure at the location(94 168 84) m of Xinbeibei Jialing River Bridge and laying ballastless track on 24 m and(32 m) simply supported T-beams of approach bridge.Research conclusions:The research indicates that it is feasible to lay ballastless track on the prestressed concrete(continuous) rigid structure with main span of 168 m and on 24 m and 32 m simply supported T-beams of approach bridge,which has broadened the applicable range of ballastless track and accumulated the new theoretical fruit for(development) of ballast track in China.