用角差前方交会法配合光电测距快速定位桥墩

Locating Abutments by the Angular Difference Intersection with EDM

首次推导出角差前方交会的方式，在桥墩定位的施工现场，可简便、快速地求得持定点的坐标偏离值。该方法精度高，适用于各种定位，特别是深水桥墩浮运物的快速精密定位更具优越性。

A formula on angular difference intersection is first mentioned in this paper.In a constuction plot of abutments location,the coordinate offsets of an unkown point can be obtained easily and rapidly by it.For example,we can adjust the coordinate offsets and get their averages with the hepl of EDM,only depending on two Plane control points.This methed is of high precision for abutments lastion and can be wildly used in all kinds of locating.Not only can it have the special advantages in lasting the floating base structures of abutments in deep-water,but also provide a new method for IDe cating plane control points.