城轨14号道岔轨道刚度规律及低动力设计  

Stiffness Laws and Low Dynamic Design of Urban Rail No.14 Turnout Track

作　　者：李智恒 周华龙[3] 徐井芒[1,2] 周昌盛 LI Zhiheng;ZHOU Hualong;XU Jingmang;ZHOU Changsheng(MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,China)

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,成都610031 [2]西南交通大学土木工程学院,成都610031 [3]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道建筑》2024年第3期41-46,共6页Railway Engineering

基　　金：中铁二院工程集团有限责任公司科研项目(科2022-01)。

摘　　要：为研究侧向过岔速度更高的国产14号无砟道岔轨道刚度分布规律,基于有限元理论,建立城轨14号道岔轨道刚度计算模型,模型中充分考虑轨下胶垫、板下胶垫、钢轨类型、滑床台等部件的影响,重点分析了14号道岔整体刚度纵向分布的变化规律,并针对轨道刚度分布不均匀进行了低动力设计。结果表明:城轨14号单开道岔轨道竖向刚度沿线路纵向不均匀分布,其中连接部分刚度最小,转辙器部分刚度最大值为连接部分的1.5倍,辙叉部分刚度最大值为连接部分的2.0倍;通过低动力设计,钢轨整体刚度纵向变化率最大值从207.4%降至121.6%,钢轨挠度变化率全部降至0.3 mm/m以内,能够满足城轨14号道岔的运输组织要求。In order to study the distribution laws of stiffness of domestic No.14 ballastless turnout track with higher lateral turnout-crossing speed,a stiffness calculation model for urban rail No.14 turnout track was established based on finite element theory.The model fully considers the influence of components such as under-rail rubber pads,under-plate rubber pads,rail types,and sliding platforms.The focus is on analyzing the variation laws of the overall longitudinal distribution of stiffness of No.14 turnout,and low dynamic design was carried out to address the uneven distribution of track stiffness.The results show that the vertical stiffness of the urban rail No.14 single turnout track is unevenly distributed along the longitudinal direction of the line,with the minimum stiffness in the connecting part,the maximum stiffness in the turnout part is 1.5 times that of the connecting part,and the maximum stiffness in the frog part is 2.0 times that of the connecting part.Through low dynamic design,the maximum longitudinal change rate of the overall stiffness of the steel rail has been reduced from 207.4%to 121.6%,and the deflection change rate of the steel rail has been reduced to within 0.3 mm/m,which can meet the transportation organization requirements of the urban rail No.14 turnout.

关 键 词：地铁 轨道刚度 数值计算 道岔 低动力设计 

分 类 号：U213.6[交通运输工程—道路与铁道工程]