全站仪三维坐标法在桥梁施工测量中的应用

尽管全站仪三维坐标法已在工程测量领域得到广泛采用,但其测量精度及其影响因素还需要深入分析,使之能合理地应用于具体工程。推导了三维坐标的精度计算公式,分析了测量精度的影响因素,针对特定的测量仪器、测量条件和大气折光误差,计算和分析了测点所能达到的精度,阐明了控制和提高测量精度的措施。将该方法应用于苏通大桥墩塔基础施工测量,根据具体的测量仪器和环境条件等,计算测点的点位中误差和高程中误差分别为±5.9mm和±6.9mm,其精度完全满足施工测量的限差要求,表明测量结果具有较高的精度和可信度。

Application of total station three dimensional coordinate surveying in construction survey of bridge

The precision of total station three dimensional coordinate surveying and its influence factors must be analyzed in depth so that this surveying method can be applied to specific project rationally, although this surveying method is widly used in engineering survey at present. The calculation formula of precision is deduced, the influence factors of precision is analyzed. The precision of survey point is calculated and analyzed for the given surveying instrument and surveying condition as well as the error of vertical refraction coefficient. The method for controlling and raising precision is expounded. This surveying method is applied to the construction survey of a pier in Su-Tong bridge, the mean square error of a point is ±5. 9mm and mean square error of height is ±6. 9mm according to the given surveying instrument and surveying surroundings. The precision can satisfy the needs of construction survey, which indicted that the surveying results have higher precision and credibility.