高精度陀螺全站仪在长大铁路隧道CPⅡ平面控制网分段建网测量中的应用  

Application of High Precision Gyro Total Station in Segmental Network Construction Survey of CPⅡ Plane Control Network of Railway Tunnel

作　　者：刘斌 Liu Bin(The First Construction Division Co.,Ltd of China Railway Tunnel Group,Chongqing 401123,China)

机构地区：[1]中铁隧道集团一处有限公司,重庆401123

出　　处：《铁道勘察》2020年第3期17-21,共5页Railway Investigation and Surveying

摘　　要：为了确保隧道贯通前CPⅡ分段建网的精度,保障隧道的顺利施工,以格库铁路阿尔金山隧道为工程背景,采用高精度陀螺全站仪对洞内CPⅡ平面控制网加测多条陀螺边,并提出了陀螺定向精度观测精度内检核、多条陀螺边定向复核的方法,对陀螺定向边位置的选择、陀螺方位角观测中误差、陀螺方位角观测值的应用区间进行探讨。应用高精度陀螺定向成果对比分析洞内CPⅡ分段控制网成果,从理论上探讨了加测陀螺边对CPⅡ控制网贯通预计精度的影响,解决了隧道贯通前CPⅡ平面控制网精度无法验证的问题,确保了CPⅡ分段建网的精度,总结出一套高精度陀螺全站仪在长大铁路隧道CPⅡ平面控制网分段建网测量中的应用方法,其中包括陀螺定向边间距约2 km、陀螺定向边采用对向观测、每测站数不小于4测回且观测方向平均测角中误差应小于仪器精度(3.6″)、依据陀螺观测计算方位角与导线推算方位角较差值并将成果应用划为三个应用区间、依据陀螺定向观测精度变换权重降低贯通预计值、优化约束平差计算方案等。To ensure the accuracy of CP Ⅱ segmented network construction before the tunnel goes through,and to ensure the smooth construction of the tunnel,taking the Altun Mountain Tunnel of the Ge’ermu-Ku’erle Railway as the engineering background,the high-precision gyro total station has been used to measure multiple gyro edges in the CP Ⅱ plane control network in the cave.A method including internal check of gyro directional observation accuracy and multiple gyro edge directional recheck is proposed,and the selection of gyro directional edge position,errors in gyro azimuth observation,and application range of gyro azimuth observation are discussed.Comparing and analyzing the results of CP Ⅱ segmented control network in the cave and the results of high-precision gyro orientation,this paper has theoretically discussed the iLfluence of the added gyroscope edge on the predicted accuracy of CP Ⅱ control network penetration,solved the problem that the accuracy of CP Ⅱ plane control network cannot be verified before tunnel penetration,ensured the accuracy of CP Ⅱ segmented network construction,and summarized a set of high precision application method of gyro total station in segmented network measurement of CP Ⅱ plane control network in long and large railway tunnels,which includes a gyro directional edge spacing of about 2 km,gyro directional edges with opposite observation,and the number of measurement for each station is not less than 4 rounds.The mean square error of angles for the observation direction should be less than the accuracy of the instrument(3.6"),then based the difference between the azimuth angle calculated from the gyro observation and the traverse,the result application is divided into three application intervals.This method also reduces the penetration estimated value and optimizes constraint adjustment calculation scheme by changing weights according to the accuracy of the gyro directional observation.

关 键 词：陀螺全站仪 长大铁路隧道 CPⅡ分段建网 贯通预计 

分 类 号：P258[天文地球—测绘科学与技术] U459.1[建筑科学—桥梁与隧道工程]