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普通水准测量中要求前后视距近似相等,但在沉降观测中,监测点密集,如何让每个观测点视距与水准路线视距近似相等,成为测量的一大难题,如果不顾及前后视距差,采用自由设站观测监测点,监测点的观测值势必会受到i角的影响,加之施测场地变动较大,一般均要建地下车库,地下车库的分期开挖使得观测线路和测站很难固定,因此必需对观测值加上i角改正数。本文就结合天宝DINI03采用单程双测站的水准测量观测方式在沉降观测测量中,i角对中间点高程的影响及改正方法进行分析论述,并用实践证明其方法的可行性。
However, in the observation of settlement, the monitoring points are dense. How to make the line-of-sight of each observation point approximately equal to the line-of-sight of the standard route has become a major challenge in measurement. If you ignore the front-to-back line-of-sight Poor, the use of free station observation and monitoring points, the monitoring point observations will inevitably be affected by the i angle, coupled with large changes in the test site, generally have to build the underground garage, underground garage staged excavation allows observation lines and stations Difficult to fix, it is necessary to add observations i correction. In this paper, combined with Tempo DINI03 single-way dual station leveling measurement observation method in the settlement observation, i angle of the midpoint elevation impact and correction methods are analyzed and discussed, and the practice proved its feasibility.