测有多个陀螺方位角地下导线的平差及横向端点误差分析

Adjustment of Underground Traverse and Analysis of Horizontal Error for End Point after Adding Measuring Gyroscope Azimuth Angle

盾构法施工的要点是需要在井下布设高精度的控制支导线 ,当遇超长盾构隧道施工时 ,采用传统的方法不能满足精度要求时 ,我们常常会考虑采用加测陀螺方位角的办法来控制导线端点的横向中误差。本文结合上海地铁某超长隧道探讨加测多个陀螺方位角的导线平差及端点的横向中误差的大小。

In the tunnel constructed by shield,it is key to set p rec ise control open traverse.If the tunnel is too long,it is hard to meet the preci sion requirement by the traditional method.Therefore,adding measuring gyroscope azimuth angle is often used to control the horizontal mean square error of end p oint.This paper combines 415 routes of Shanghai subway as a case study to discus s the traverse adjustment and the horizontal mean square error of end point afte r adding measuring gyroscope azimuth angle.