重载和客货共线铁路弹性支承块式无砟轨道快速换块关键技术  

Key Technologies for Rapid Block Replacement of Elastic Support Block Ballastless Track in Heavy Haul Railway and Mixed Passenger and Freight Railway

作　　者：张爽 杜香刚 张艳荣[1] 吴楷 ZHANG Shuang;DU Xianggang;ZHANG Yanrong;WU Kai(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Railway Engineering Research Institute,CARS,Beijing 100081,China;State Key Laboratory for Track System of High-speed Railway,CARS,Beijing 100081,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [3]中国铁道科学研究院集团有限公司高速铁路轨道系统全国重点实验室,北京100081

出　　处：《铁道建筑》2024年第1期1-6,共6页Railway Engineering

基　　金：中国铁道科学研究院集团有限公司基金(2023YJ228)。

摘　　要：为选取合适的弹性支承块式无砟轨道抬轨换块施工参数,建立有限元模型,研究了抬轨点间距、扣件松开长度、抬轨量以及施工轨温与锁定轨温的温差对轨道结构变形和受力的影响,明确各参数最佳取值,提出存在空吊、离缝、套靴积水等病害的弹性支承块式无砟轨道快速换块施工方法,并在现场进行应用。结果表明:抬轨点间距宜取1.2~3.6 m,此时钢轨弯折变形较小,且钢轨拉力和扣件上拔力较小;抬升点间距每增加1.0 m,温差限值增加1℃。抬轨量16 cm,抬轨点间距1.2 m时,扣件松动长度宜大于31.8 m;温差每升高1℃,扣件松开长度应减少2.4 m。钢轨最大拉应力和扣件最大上拔力随抬轨量增加而增大,抬轨量每增加1 cm,钢轨最大拉应力增大0.66 kN,扣件最大上拔力增大0.075 MPa。In order to select appropriate construction parameters for the lifting and replacement of elastic support block ballastless track,a finite element model was established to study the effects of the spacing between lifting points,the length of fastener release,the amount of lifting,and the temperature difference between the construction rail temperature and the locking rail temperature on the deformation and stress of the track structure.The optimal range of each parameter was determined,and a fast replacement construction method for elastic support block ballastless track with diseases such as empty suspension,gap separation,and water accumulation in boots was proposed,which was applied on-site.The results show that the spacing between rail lifting points should be 1.2~3.6 m.At this time,the bending deformation of the steel rail is small,and the tension of the steel rail and the pulling force on the fasteners are small.For every 1.0 m increase in the spacing between lifting points,the temperature difference limit increases by 1℃.When the lifting amount is 16 cm and the distance between lifting points is 1.2 m,the length of loose fasteners should be greater than 31.8 m.For every 1℃increase in temperature difference,the length of the fastener release should be reduced by 2.4 m.The maximum tensile stress of the steel rail and the maximum pull-up force of the fastener increase with the increase of rail lifting amount.For every 1 cm increase in rail lifting amount,the maximum tensile stress of the steel rail increases by 0.66 kN,and the maximum pull-up force of the fastener increases by 0.075 MPa.

关 键 词：客货共线铁路 弹性支承块式无砟轨道 钢轨抬升 更换支承块 抬轨方式 抬轨量 

分 类 号：U213.2[交通运输工程—道路与铁道工程]