摘要
为探讨优化高速铁路拨道换板合理作业参数以进一步提升轨道板更换效率,以既有运营线拨道换板整修为研究对象,结合线上无砟轨道换板作业实际测试,建立了考虑钢轨、扣件、轨道关键部件的线路拨道有限元模型,研究了垫轨、拨轨状态下工装布置间距、扣件松开长度、温差等对拨道作业的影响,为更换不同类型、不同块数伤损轨道板提供数据支持与指导。研究结果表明:进行钢轨横向拨道作业前,需首先分析各垫轨、拨道工装以及轨距拉杆的相对布置间距,确定合理的工装布置方式。拨道作业时,扣件最大上拔力位于未松开的第1组扣件处,上拔力受工装抬轨高度及松开扣件长度的共同影响,与温度不相关,当扣件压力限值取18 kN时,在750 mm的钢轨横向拨道量条件下,线路总长度至少达到80 m即可保证扣件不发生上窜现象。钢轨的最大米塞斯应力位于轨距拉杆处轨底内侧,应力沿着从扣件松开处向拨道中心的方向减小,与钢轨材料弹性柔度成正相关。横向最大拉应力始终位于拨道横移加载处,应力状态均与扣件松开长度近似呈反比例函数关系,且满足钢轨允许最大拉应力限值要求。当施工轨温低于锁定轨温时为钢轨最不利受力情况,为了保证可一次性更换2块轨道板长度,建议最小线路总长度取120 m(扣件松开长度100 m)。研究结果可为进一步优化高速铁路轨道运维技术和保障高铁安全运营提供参考。
To explore the optimization of reasonable operating parameters for high-speed railway rail shifting and track slab replacement,and further improve the efficiency of track slab replacement.Taking the renovation of existing operation lines for track shifting and slab replacement as the research object,combined with the actual track slab replacement operation testing on operation line,a finite element model of track shifting considering steel rails,fastener,and track structure was established.The effects of equipment layout spacing,fasteners release length,temperature difference,and other factors on track shifting operation under track shifting states were studied,providing data support and guidance for replacing damaged track slabs of different types and numbers.The studies show that before carrying out the lateral track shifting operation of the rail,it is necessary to primary analyze the relative spacing of each rail lifting device,track shifting device,and gauge tie rod,and determine a reasonable layout method of these devices.During the track shifting,the maximum pull-up force of the fastener is located at the position where the first set of fasteners has not been released.The pull-up force is influenced by the height of the tooling lifting rail and the length of the released fastener,and is not related to temperature.Under the limit value of 18 kN of buckle pressure,the minimum total length of the line under the transverse track of 750 mm rail reaches 80 m,which can ensure that the fastener does not experience upward movement.The maximum Mise stress of the steel rail is located on the inner side of the rail bottom at the gauge tie rod,decreasing from the point where the fastener is released to the center of the track.It is positively correlated with the degree of elastic deformation of the rail material.The maximum transverse tensile stress is always located at the lateral loading point of the track.The stress state is approximately inversely proportional to the length of the fastener release,which meets the r
作者
徐凌雁
袁伟
谢剑
谢浩然
臧传臻
岳彤
XU Lingyan;YUAN Wei;XIE Jian;XIE Haoran;ZANG Chuanzhen;YUE Tong(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Railway Line and Station Yard Design Department,China Railway Design Corporation,Tianjin 300308,China;School of Civil Engineering,Central South University,Changsha 410075,China)
出处
《铁道科学与工程学报》
EI
CAS
CSCD
北大核心
2024年第7期2557-2568,共12页
Journal of Railway Science and Engineering
基金
国家自然科学基金面上资助项目(52278470)
中国国家铁路集团有限公司科技开发课题(K2020G025)
中国铁路设计集团有限公司科技开发课题(2023A0223804,2022A02036002)。
关键词
高速铁路
无砟轨道
拨道换板
运维
线上试验
high speed railway
ballastless track
shifting tracks
rectification and maintenance
operation line test
