摘要
有砟轨道不平顺通常由大型养路机械捣固车拨道与起道抄平作业控制。高速铁路和普速铁路桥梁有砟轨道在捣固车精捣作业后,梁上轨道普遍存在难以消除的上拱现象,造成轨道垂向不平顺,影响列车安全平稳行驶。根据起道抄平原理,深入分析梁上轨道上拱成因,推演捣固车在简支梁桥有砟轨道作业的起道抄平误差模型(Lifting and Levelling Error Model,LLEM)。对轨道静态检测垂向偏差做带通滤波处理,构建32 m简支梁有砟轨道上拱的静态修正函数。运用动态检测里程误差修正及高通滤波处理方法,确定梁上轨道动、静态检测垂向不平顺互差,得出32 m简支梁桥有砟轨道预拱模型(Ballasted Track Pre-Camber Setting Model,BTPCM)。最后,通过某新建有砟轨道桥梁段精测精捣工程实践检验,采用动静态修正对比分析,从静态检测3种弦长指标、动态检测轨道不平顺谱以及车体垂向加速度三方面,验证LLEM和BTPCM的有效性。研究表明,轨道上拱是捣固作业点纵向矢距发生变化引入起道抄平误差所致,是作业中梁体受捣固车动荷载影响的结果。精测精捣中顾及起道抄平误差和有砟轨道预拱,能切实有效地控制多跨32 m简支梁桥有砟轨道动态垂向不平顺,使列车高速行驶更加平稳舒适。
The irregularity of ballasted track is mostly controlled by the track lining and levelling operation of tamping vehicle of heavy-duty track maintenance machinery.There is a prevailing and intractable track camber on the beam after precise tamping operation of the tamping vehicle on the ballasted track of high-speed and conventional-speed railway bridges,causing the vertical irregularity of the track and affecting the safety and stability of trains.According to the principle of track lifting and levelling,an in-depth analysis was conducted on the causes of the track camber on the beam,to derive the lifting and levelling error model(LLEM)of tamping vehicle operating on the ballasted track of simply-supported beam bridge.Furthermore,a corresponding static correction function was established for the ballasted track camber on the 32 m span simply-supported beam by processing the track vertical deviation of static inspection with band-pass filters.Based on the methods of dynamic mileage error correction and high pass filtering,the mutual difference of vertical irregularity between the dynamic and static inspection of track on beam was determined to obtain the ballasted track pre-camber setting model(BTPCM)of 32 m simply-supported beam bridge.Finally,based on the precise tamping project of a newly built ballasted track bridge section,a dynamic and static correction comparative analysis was conducted to verify the validity of LLEM and BTPCM from three aspects:static inspection of three indicators of different chord length,dynamic inspection of track irregularity spectrum and vertical acceleration of vehicle body.The research shows that the track camber is caused by track lifting and levelling error that is introduced by the change of the vertical chord offset of tamping operation point,which is the result of the beam body under the dynamic load from tamping vehicle during the operation.The dynamic vertical irregularity of the ballasted track on multi-span 32 m simply-supported beam bridge can be effectively regulated by
作者
江来伟
岑敏仪
张同刚
李阳腾龙
JIANG Laiwei;CEN Minyi;ZHANG Tonggang;LI Yangtenglong(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2023年第8期129-137,共9页
Journal of the China Railway Society
基金
中国国家铁路集团有限公司科技研究开发计划(P2019G029)
中国博士后科学基金(2019M663555)。
关键词
简支梁桥
轨道上拱
抄平误差
轨道预拱模型
精测精捣
simply-supported beam bridge
track camber
levelling error
track pre-camber model
precise inspection and tamping
