郑武段客运专线CRTSⅡ型板式无砟轨道摩擦板和端刺方案研究

Research on the Scheme of Installing Friction Plate and End-spine on CRTS Ⅱ Slab Ballastless Track on Bridge of Zhengzhou-Wuhan Passenger Dedicated Line

研究目的:CRTSⅡ型板式无砟轨道桥上底座板纵向连续后,其上产生的温度力和制动力等将影响到路基上的轨道结构,在桥台后一定长度路基上设置摩擦板和端刺,可以将连续底座板上产生的温度力和制动力等传至路基内,不再影响路基上的轨道结构。通过本研究,提出一个既能确保路基上轨道结构安全稳定、又能节省工程投资的摩擦板和端刺方案。研究结论:采用倒T型端刺,小端刺下基床表层和基床底层深度范围路基填筑级配碎石掺水泥、大端刺两端各5 m宽按1∶2刷坡范围路基填筑级配碎石掺水泥方案,加荷载后,端刺最大纵向水平位移小于3 mm,能够确保路基上轨道结构安全稳定;且工程造价较原京津城际铁路摩擦板端刺方案经济。

Research purposes： After the base plate of CRTS Ⅱ slab ballastless track on bridge is vertically continuous, the temperature force and braking force caused by it will affect the track structure. Installation of friction plate and end - spine within certain region of subgrade behind abutment can transfer the forces to track structure. The purpose of this research is to seek a scheme of installation subgrade, of the fri and the forces will not affect ction plate and endspine, which can ensure the safety and stability of track structure and also can reduce the construction cost. Research conclusions：The scheme of using inverted T type end - spine, filling certain depth of roadbed surface and bottom layer under small end - spine with graded gravel - doped cement, and filling subgrade with graded gravel - doped cement at both ends of large end - spine within 5 m width by 1 ： 2 slope was adopted. Adopting this scheme, the maximum longitudinal displacement of end - spine is 3 mm under loading, which can ensure the safety and stability of track structure. Besides, the costs of the friction plate and end - spine are lower than that for Beijing - Tianjin intercity Railway.