全站仪三角高程中点法在大西客运专线桥墩测量中的应用

Application of Total Station Trigonometric Leveling Central Point Method in Pier Surveying of Datong-Xi'an PDL

在大西客运专线大张村特大桥桥墩及垫石高程测量中,为提高全站仪三角高程测量精度,通过对全站仪三角高程中点法计算公式原理及误差精度的分析,采用TCR1201+R1000型全站仪在一定观测条件下满足了该桥桥墩及垫石高程规范要求,以该桥210号墩顶高程测量为实例,证明全站仪三角高程中点法在在前视棱镜等高的情况下,在仪器满足精度,单向测距在300 m内,倾角在30°内条件下可满足二等水准测量精度要求。

To improve the accuracy of total station trigonometric leveling in the pier and padstone elevation surveying of Dazhangcun bridge on Datong-Xi＇an passenger dedicated line,through the analysis of calculation formula and error accuracy of the total station trigonometric leveling central point method,the authors used TCR 1201＋R1000 total station and met the requirements of the pier and padstone elevation specifications under certain conditions.Taking No.210 bridge pier elevation measurement as an example,it has been proved that the total station trigonometric leveling central point method can meet the second class measurement accuracy under the circumstance of equal hight forward-looking prisms,and the instrument meeting the accuracy of one-way distance within 300m and the inclination angle within 30°.