摘要
某有砟客运专线开通一段时间后出现周期性钢轨低塌不平顺、线路高低和轨枕空吊等现象,导致轨道质量指数(TQI)增大,人工维修成本大幅上升。轨面低塌位置分布在距焊缝大里程方向2.2~2.8 m,光带加宽6~10 mm,低塌和正常位置钢轨廓形存在明显差异。建立实参数车辆-轨道耦合系统动力学模型,结合TQI变化和线路调查数据,分析线路高低产生的形成机理。综合考虑问题特征、形成机理及不同类型打磨作业特点,创新性采用小机打磨、快速打磨和传统打磨多种作业相结合的打磨整治方案。打磨后周期性钢轨低塌不平顺和廓形差异基本消除,光带宽度均匀、位置居中,钢轨打磨质量指数(GQI)显著提升,轮轨垂向力和车体垂向振动加速度大幅降低、周期性消除;同时TQI保持稳定,人工维修成本大幅降低。该客运专线钢轨周期性不平顺问题得到的综合整治经验,为有砟客运专线同类问题的准确定位和有效解决提供参考思路。
After a period of commercial operation,one of the ballasted passenger dedicated line showed rail surface collapse and irregularity,deviation of longitudinal level and suspended sleeper,which led to an increase of TQI and a substantial rise of manual maintenance cost.The rail surface collapse happened within 2.2~2.8 m of welding joints along the large mileage direction,the light band was widened 6~10 mm,and the collapsed part showed significant differences against normal rail profile.The dynamic model of vehicle-rail coupling system with real parameters was established to analyze the formation mechanism of longitudinal level of line in consideration of TQI changes and line survey data.After overall consideration of the rail defects,formation mechanism and different grinding operations,a grinding treatment scheme integrating small machine grinding,rapid grinding and traditional grinding was adopted in an innovative way.After grinding,the periodic low collapse irregularity and profile difference were basically eliminated,the width of the light band became uniform and centered,the rail GQI was significantly improved,the vertical force of wheel-rail and the vibration acceleration of carbody were greatly reduced and periodically eliminated;meanwhile,TQI remained stable and the cost of manual maintenance was substantially decreased.The successful treatment of the periodical irregularity on this line will help track maintainers accurately target the similar defects and solve the problem efficiently.
作者
刘永乾
郭猛刚
侯银庆
张紫龙
王军平
LIU Yongqian;GUO Menggang;HOU Yinqing;ZHANG Zilong;WANG Junping(China Railway Materials Operation and Maintenance Technology Co Ltd,Beijing 100036,China;Beijing Tiefu Track Maintenance Technology Co Ltd,Beijing 100036,China;School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《中国铁路》
2020年第9期98-105,共8页
China Railway
基金
中国铁路总公司科技研究开发计划项目(2017G003-A)。
关键词
有砟线路
客运专线
钢轨不平顺
周期性
钢轨打磨
TQI
GQI
ballasted line
passenger dedicated line
irregularity of rail surface
periodic
rail grinding
TQI
GQI
