新型钢枕道床横向阻力试验与分析

Test and Analysis of Lateral Resistance of Innovated Steel Sleeper

研究目的:钢枕具有100%可再生、可循环利用的优势,适用于不同速度、轴重、轨距的线路;设计和应用灵活,能够降低桥隧建筑结构高度;钢枕安装和运输方便,在"一带一路"国家中均有大量应用。由于钢枕结构和材质原因,其道床阻力较低,限制了钢枕应用范围的扩大。本文通过采用加肋和设置橡胶垫方式来提高钢枕道床横向阻力,进行不同条件下道床横向阻力试验研究。研究结论:(1)普通钢枕道床横向阻力为Ⅲc型混凝土轨枕的51. 9%~62. 4%,远低于普通铁路无缝线路设计要求,需要进行加强;(2)钢枕枕底、肩部及枕心道床横向阻力分担依次为52. 8%~74. 7%、11. 3%~37. 4%、9. 9%~14. 0%;(3)肋板可显著提升钢枕道床横向阻力,其作用优于砟肩堆高和加宽,且横向阻力随肋板数目增加而提高;(4)橡胶垫复合钢枕道床横向阻力均高于普通钢枕,大凸型增加比例为3. 0%~5. 9%,小凸型增加比例为22. 2%~25. 5%;(5)本研究成果可为扩大钢枕应用范围提供参考。

Research purposes: Steel sleepers can be 100% recycled and used in the different speed,axle load and gauge. The steel sleeper could be flexible designed and used to reduce the track height for the bridge and tunnel,easy for the transportation and installation,and widely adopted in " the Belt and Road" countries. On the contrary,the steel sleeper results in less lateral resistance due to its structure and material which sets back its wide application. In this paper,steel ribs and rubber pads are installed to the steel sleeper to increase its lateral resistance,and a series of lateral resistance tests were carried out to investigate its basic characteristics and influence.Research conclusions:( 1) Steel sleepers produce less lateral resistance than the Ⅲ c sleeper,with the variation of51. 9% ~ 62. 4%,which should be reinforced for the CWR.( 2) The lateral resistance contribution is 52. 8% ~ 74. 7%for the base,11. 3% ~ 37. 4% for the shoulder,and 9. 9% ~ 14. 0% for the crib.( 3) Steel ribs could be used to increase the lateral resistance better than the shoulder height or width increase,and the lateral resistance increases with the rib number.( 4) Rubber pads result in more lateral resistance with the large convex type increasing the proportion of3. 0%-5. 9% and the small convex type increasing 22. 2%-25. 5%.( 5) The research results can provide a reference for expanding the application range of steel sleepers.