三维坐标法检测苏通大桥曲线段承台钢套箱精度分析

Accuracy analysis of three-dimensional coordinate method checking curve sect caps steel suspension-box cofferdams of Sutong Bridge

结合苏通大桥曲线段承台钢套箱的检测,对全站仪的三维坐标法测量点位的平面位置及高程的精度进行了分析,就全站仪的视准差、横轴的倾斜误差及后视已知点的定向误差对测量点位平面位置的影响和指标差对测量高程的影响进行了较深入的分析,并进行了模拟计算.在利用全站仪的坐标测量功能进行三维坐标测量时,对仪器进行视准差、横轴的倾斜误差进行设置及高程值用盘左、盘右测量取均值可以取得较好的测量效果.对苏通大桥曲线段承台钢套箱的角点坐标放样数据进行计算,并建立了数据库.

Using three-dimensional coordinate method of total station checking precision of plane position ,the height is analyzed, the influence on plane position of total station collimation error or tilting axis error and setting backsight station error, the influence on height of total station vertical circle indexing error are also analyzed. Using total station coordinate measurement, three-dimensional coordinate functions measured, and collimation error or tilting axis error of total station is built, height by face left and face right measurement can obtain good checking effect. For the coordinate setting-out data of curve sect caps steel suspension-box cofferdams of Sutong Bridge are calculated and set up database is set up.