全站仪中间法在桥面高程监测中的应用及精度分析

Application and Precision Analysis when Using Middle Method of Total Station in Bridge Deck Elevation Measure

基于现场测量条件,对比分析了在桥面高程测量过程中,采用几何水准法和全站仪测量的可行性和存在的问题。通过对全站仪中间法测量过程中误差指标进行计算,分析了在不同测量条件下,全站仪中间法可能达到的水准测量精度,以及要达到该测量精度时需要的测量条件。结合桥梁桥面高程监测的布点要求和现场条件,计算了采用0.5″级全站仪进行中间法对跨径为50 m、80 m和200 m的桥梁进行高程监测时可达到的精度。认为采用全站仪中间法,有条件满足桥面高程监测的精度要求,提出了采用全站仪进行桥面高程测量时的布点形式,为桥面高程测量中的应用提供一定的借鉴。

Based on the field measuring conditions, the feasibility and the problems of geometric leveling method and middle method of total station were analyzed, when used in bridge deck elevation measure. Through calculated the error indexes of middle method of total station in different measuring conditions, the leveling precisions which could reached by using the method were found out, and the measuring conditions were put forward, which were needed in the measuring. Combined the stationing demands of bridge deck elevation measure, the measuring precisions were analyzed by using 0. 5″ midway method, when L = 50 m, L = 80 m, L = 200 m. Besides, it was put forward that when setting the station between the measuring points, the measuring conditions were enough to make sure the precision could meet the demands by using midway method. And a stationing form of the bridge deck elevation measure was put forward when using midway method, which offered reference for bridge deck elevation measure.