测角精度1秒级全站仪变形测量精度分析

Precision analysis of 1-second electronic total station in deformation measurement

以郑州市轨道交通4号线鑫融路站基坑为背景,通过施工现场实验监测,评定测角精度1秒级全站仪变形测量精度。在强制对中墩上安置全站仪及反射棱镜,采用坐标测量模式,利用定向垂距法计算监测点到基坑轮廓线距离,并得出监测点坐标、垂距及相应中误差。实验结果表明:用测角精度1秒级全站仪进行基坑变形监测,其坐标、垂距中误差均小于0.15 mm,可以满足规范要求。

Taking the foundation pit of Xinrong Road Station of Zhengzhou Metro Line 4 as the background, through the construction site monitoring and evaluation, the accuracy of the deformation of the total station is evaluated. In order to calculate the total point and reflector prism on the mound, the coordinate measuring mode is used to calculate the distance from the monitoring point to the contour of the foundation pit by the directional vertical distance method, and the coordinates, vertical distance and corresponding error of the monitoring point are obtained. The test results show that the deformation of the foundation pit is monitored by the one-second total station with the accuracy of angle measurement, and the mean error of the coordinates and the offset are less than 0.15 mm, which can meet the requirements of the specification.