红外测距仪在城市道路放线测量中的应用

APLICATION OF EDM TO THE SETTING－OUT SURVEYING FOR THE CITY’S ROADS

在城市道路放线测量中，碰到障碍物是司空见惯的．障碍物的存在，阻挡了视线的近视；这时测量工作者必须想方设法绕过或跨越障碍物，在实地标定出位于障碍物另一端视线“盲区”内的中线桩的点位．当障碍物比较多而且比较复杂时，通常的做法先有设经纬仪导线，再由邻近的导线点在实地标定出上述中桩点的位置．这种方法既费时又费力，在时间紧、任务重的场合不大适用．本文介绍一种使用红外测距仪快速跨越障碍物的作业方案，既省时又省力，可以大大缩短工期，极大地提高放线测量的工作效率．

Encountering obstacles in the setting-out surveying for the city's roads is a common occurrence. The existence of the obstacles blocks the sight of the observer,so he (or she)has to bypass ot surmount the obstacles in order to determine the positions of the centcrline stakes of the rcod on the other side of the obstacles which happen to locate in the 'dead area' of the sight. When the obstacles are numerous and complicated,as a rule, it is necessary to determine in advance the poritions of some Points lying outside the centerline of the road by the thedolite traverse from them the centerline stakes can be setted out. Deing time- consuming and low efficient, the method doesn't work in some cases. A precedure to quickIy surmount the obstacles by using EDM is prasented in this paper. The experience of the author shows that adoption of the precedure can save time and labour,and greatly enhance the efficiency of the setting out surveying.