双线货运铁路天窗点外CPⅢ平面测量方法研究  

Research on the Application of CPⅢPlane Measurement Method for Outside Skylights of Double Track Freight Railways

作　　者：魏涌 WEI Yong(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：《铁道勘察》2024年第3期34-38,共5页Railway Investigation and Surveying

摘　　要：为解决运营期双线货运铁路CPⅢ平面控制网无法在天窗点外测量的问题,提出一种双侧自由测站CPⅢ平面控制网测量方法。通过分别在既有铁路道床坡脚(限界)外两侧路肩架设全站仪,获取全站仪与同侧左右各1个CPⅢ点及对侧多个CPⅢ点之间的边角关系,从而形成包含大量CPⅢ点与自由测站间方向和距离观测值的边角交会网,按照边角网平差方法,求取CPⅢ点的坐标。试验表明,双侧自由测站CPⅢ平面测量自由网及约束网平差各项精度指标均能满足铁路工程测量规范的要求;与常规测量方法相比,其方向平差结果、距离平差结果、最弱点点位中误差及相邻点相对点位中误差等控制网平差精度指标均有所提升;两种测量方法获取的CPⅢ点坐标较差极值为-4.1 mm,相邻点坐标增量较差极值为2.8 mm,满足铁路工程测量规范对于CPⅢ控制网复测的要求。研究结果表明,双侧自由测站方法可克服天窗时间限制及接触网杆遮挡等因素的影响,适用于双线货运铁路天窗点外CPⅢ平面控制网测量工作。In order to solve the problem of the CPⅢplane control network of the double track freight railway being unable to be measured outside the skylight point during the operation period,a measurement method of bilateral free measuring stations was proposed.By setting up a total station on the shoulders outside the existing railway ballast bed slope toe(gauge),the distance and angle relationship between the total station and the left and right CPⅢpoints of the same side,as well as multiple CPⅢpoints on the opposite side,were obtained.The results in a corner intersection network contained a large number of direction and distance observations between CPⅢpoints and the free measuring stations.The coordinates of CPⅢpoints were calculated using the corner network adjustment method.The experiment shows that,the accuracy indicators of the CPⅢplane measurement free network and constrained network adjustment of the bilateral free measurement stations can meet the relevant requirements of the railway engineering measurement specifications.Compared with conventional measurement methods,the accuracy indicators of control network adjustment such as direction adjustment results,distance adjustment results,mean square error of the weakest point position,and relative mean square error of adjacent points have all been improved.The maximum difference in coordinates of CPⅢpoint obtained by two measurement methods is-4.1 mm,and the maximum difference in coordinate increments of adjacent points is 2.8 mm,which meets the requirements of railway engineering measurement specifications for CPⅢcontrol network remeasurement.The research results indicate that the bilateral free station method overcomes the influence of factors such as skylight time limitations and overhead contact line pole obstruction,and can be used for the measurement of the CPⅢplane control network outside skylights of the double track freight railway.

关 键 词：双线货运铁路 天窗点 CPⅢ平面控制网 双侧自由测站 

分 类 号：U239.8[交通运输工程—道路与铁道工程] P258[天文地球—测绘科学与技术]