大跨度斜拉桥主梁上CPⅢ点实时平面坐标预测方法及应用  

Application of CPⅢPoint Real-time Plane Coordinate Prediction Method on Main Girder of Long-span Cable-stayed Bridge

作　　者：宋卓阳 刘成龙 滕焕乐[3] 吴石军[3] 韩冰[1,2] 杨雪峰 SONG Zhuoyang;LIU Chenglong;TENG Huanle;WU Shijun;HAN Bing;YANG Xuefeng(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China;State-Province Joint Engineering Laboratory in Spatial Information Technology for High-Speed Railway Safety,Southwest Jiaotong University,Chengdu 611756,China;China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,成都611756 [2]西南交通大学高速铁路运营安全空间信息技术国家地方联合工程实验室,成都611756 [3]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道建筑》2020年第12期34-37,共4页Railway Engineering

基　　金：中铁第四勘察设计院集团有限公司科技研究开发项目(2018K133)。

摘　　要：铁路大跨斜拉桥主梁结构稳定性差和桥面变形大,主梁上CPⅢ控制点的平面坐标受外界环境因素影响存在多值问题。依托昌赣高速铁路赣江特大桥,基于该斜拉桥结构特点、主梁上CPⅢ点平面坐标变化规律和高速铁路精测网测量要求,建立了CPⅢ点实时平面坐标预测模型。通过纵向位移传感器的实时读数计算主梁上任意时刻纵向位移为0的不动点位置,并依此判定各CPⅢ点纵向位移变化量的权重,进而推算主梁上各CPⅢ点的实时纵向坐标。通过分析预测坐标与实测坐标的较差以及采用预测坐标自由设站测量2种方法,验证了本文所建预测模型精度较好。该模型目前已成功应用于赣江特大桥上无砟轨道施工,效果良好。The structural stability of the main girder of long-span cable-stayed railway bridge is poor and the bridgedeck deformation is large,and the plane coordinates of the CPⅢcontrol point on the main girder are affected byexternal environmental factors,which leads to multi-value problem.Relying on the Ganjiang super large bridge ofNanchang-Ganzhou high speed railway,based on the structural characteristics of the cable-stayed bridge,the changinglaw of the plane coordinates of CPⅢpoint on the main girder and the measurement requirements of the high speedrailway precision measurement network,a real-time plane coordinate prediction model of CPⅢpoint was established.The real-time reading of the longitudinal displacement sensor was used to calculate the fixed point position on the maingirder where the longitudinal displacement is zero at any time,and the weight of the longitudinal displacement variationof each CPⅢpoint was determined accordingly,and then the real-time longitudinal coordinates of each CPⅢpoint onthe main girder were calculated.Through the analysis of the difference between the predicted coordinates and themeasured coordinates,as well as the free station measurement with the predicted coordinates,the good accuracy of theprediction model established in this paper was verified.At present,the model has been successfully applied to theconstruction of ballastless track on Ganjiang super large bridge with good results.

关 键 词：铁路桥梁 平面坐标预测 大跨斜拉桥 轨道精调 CPⅢ点平面坐标 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U442[交通运输工程—道路与铁道工程]