长大连续梁上CPIII控制点实时坐标计算方法研究  

The real-time coordinate calculation of CPIII control points in large continuous beams

作　　者：马洪磊[1] 刘成龙[1] 邹浜[2] 杨雪峰[1] 刘爽[1] 

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都611756 [2]四川九洲电器集团有限责任公司,四川绵阳621000

出　　处：《铁道科学与工程学报》2014年第5期30-34,共5页Journal of Railway Science and Engineering

基　　金：中央高校基本科研业务专项资金资助项目(SWJTU12ZT07);“2011计划”轨道交通安全协同创新中心经费资助项目

摘　　要：针对长大连续梁上CPIII控制点随梁体变形发生位移,从而导致CPIII控制点平面坐标发生变化的问题,提出一种新的解决方法。该方法通过比较2对CPIII控制点间的实时距离与原始距离,获得梁体缩放系数,然后将连续梁上CPIII控制点的原始平面坐标转换到桥轴线坐标系中并利用梁体缩放系数对其进行改正,最后将改正后的坐标转换回线路独立坐标系中,得到CPIII控制点的实时平面坐标。通过工程实践验证,新方法在梁体变形主要受温度影响的前提下适用,无需专门设备测量梁体伸缩量,能够在轨道板精调或轨道精测前实时获得梁上CPIII控制点的平面坐标,并满足精度要求。该方法可在高速铁路精密工程测量中推广使用。CPIII control points in large continuous beams displace with the deformation of the beams,which changes the plane coordinates of CPIII control points.To solve this problem,a new solution was introduced in this paper.With this method the zoom coefficient of the beam body was obtained by comparing the actual dis-tance and the original distance of two pairs of CPIII control points.Then the original plane coordinates of CPIII control points were converted into bridge axis coordinate system,and modified by using the zoom coefficient of the beam body.Finally,the revised coordinates were shifted to the independent line coordinate system,so as to get the real-time coordinates of CPIII control points.It is verified that the new method is applicable in the con-dition of beam deformation affected mainly by temperature,and can gain real-time plane coordinates of control points by using the new solution,before track plate precision adjustment or track precision measurement,without measuring the beam expansion volume with specialized equipment.Since the results can meet the accuracy re-quirements of engineering practice,this proposed method can be promoted into high-speed railway precision en-gineering measurement.

关 键 词：长大连续梁 CPⅢ控制点 缩放系数 桥轴线坐标系 实时坐标 

分 类 号：U448.215[建筑科学—桥梁与隧道工程]