城市轨道交通用60kg/m钢轨9号可动心轨辙叉单开道岔设计及检算  

Design and Checking Calculation of No.9 Single Turnout with Movable-point Frog for 60 kg/m Rail for Urban Rail Transit

作　　者：张东风 邵壮 骆焱 ZHANG Dongfeng;SHAO Zhuang;LUO Yan(China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China)

机构地区：[1]中铁工程设计咨询集团有限公司,北京100055

出　　处：《中国铁路》2024年第9期58-65,共8页China Railway

基　　金：中国城市轨道交通协会科研专项(CAMET-KY-2022092)。

摘　　要：目前城市轨道交通道岔区振动主要来源于固定型辙叉,因此对城市轨道交通用60 kg/m钢轨9号可动心轨辙叉单开道岔提出研发需求,以实现减振能力提升。通过研究9号可动心轨辙叉单开道岔总布置方案,提出道岔全长为30950 mm、导曲线半径为200 m的方案;研究设计道岔结构,转辙器尖轨采用60AT2轨型,翼轨采用特种断面翼轨,心轨采用双肢弹性可弯结构,并采用错动装置;以25 kN/mm扣件节点刚度为基础,开展岔区刚度的均匀化设计和计算,最大纵向刚度变化率由140%降至112%。通过进一步对道岔尖轨、心轨转换力进行检算,在正常养护情况下,尖轨第1、2牵引点的理论转换力分别为0.893、2.547 kN,心轨牵引点的理论转换力为1.910 kN;以无砟道岔为检算工况对道岔无缝化进行检算,在轨温变化幅度50℃范围内,60 kg/m钢轨9号可动心轨辙叉单开道岔的各项指标均满足相关控制条件。At present,the vibration in turnout area of urban rail transit mainly comes from fixed frog.Therefore,there is a demand for research and development of No.9 single turnout with movable-point frog for 60 kg/m rail for urban rail transit,to reinforce the vibration reduction.By studying the general layout scheme of No.9 single turnout with movable-point frog,it is proposed that the total length of the turnout is 30,950 mm and the radius of lead curve is 200 m.The switch rail adopts 60AT2 rail type,the wing rail adopts special section wing rail,and the point rail adopts double-arm elastic bendable structure with staggering device.Based on the 25 kN/mm fastening joint stiffness,the homogenization design and calculation of the stiffness in the turnout area are carried out,and the maximum longitudinal stiffness change rate is reduced from 140%to 112%.Through checking calculation of the switching force of turnout switch rail and point rail,under normal maintenance conditions,the theoretical switching forces of 1st and 2nd traction points of switch rail are 0.893 and 2.547 kN respectively,and the theoretical switching force for the traction point of point rail is 1.910 kN.The CWR turnout is subject to checking calculation with ballastless turnout as the working condition.Within the rail temperature variation range of 50°C,all indicators of No.9 single turnout with movable-point frog for 60 kg/m rail meet relevant requirements.

关 键 词：城市轨道交通 道岔 可动心轨 辙叉 结构设计 检算 

分 类 号：U213.6[交通运输工程—道路与铁道工程]