间接测边网在深基坑水平位移监测中的应用

Application of Indirect Edge Measuring Net in Deep Foundation Pit Horizontal Displacement Monitoring

深基坑开挖施工中,水平位移监测为必选项目,而城市狭窄的空间中进行深基坑开挖,使用在地面或楼顶布点架站观测的传统方法来建立水平位移监测基准网已经变得十分困难。为了解决这个问题,应用高精度智能全站仪ATR技术,采用对边测量方法,构成由棱镜中心为间接边的监测基准网。实验结果表明,间接测边测量精度主要取决于仪器的测边精度,测角误差的影响与测边误差余项的影响基本互为抵消,能够很好地满足实际深基坑水平位移监测精度需求。因此,采用对边测量方法能满足一级平面控制基准网的技术要求,为城市深基坑开挖水平位移自动化监测提供可靠的基准依据。

Horizontal displacement monitoring is a necessary project in the construction of deep foundation pit excavation.In the city narrow space,it has become very difficult to establish the horizontal displacement monitoring reference network with the traditional method of observation on the ground or the roof.To solve this problem,we applied high-precision intelligent total station ATR technology and edge measurement method to form a monitoring reference network with the prism center as indirect edge.The experiment results show that the accuracy of indirect edge measurement mainly depends on the accuracy of the instrument.The influence of angle error and edge measurement errors basically offset each other,which can well meet the deep foundation pit horizontal displacement monitoring accuracy requirements.The proposed method can meet the technical requirements of the first-level plane control reference network and provides reference for automating urban deep foundation pit excavation horizontal displacement monitoring.