曲线桥梁墩台中心坐标计算方法研究

Research on coordinate calculation method of curve bridge piers and abutments center

曲线桥梁墩台中心坐标是桥梁工程测量中最重要的放样数据,常用的计算方法是导线法,但其计算步骤繁琐。通过分析墩台中心坐标与线路中心坐标的关系,提出"偏距法"的计算思路,即先按照中线里程计算出中线点坐标,在此基础上,按照该点的法线方向向外移动的偏距来计算,并结合生产实际案例计算与导线法进行比较,结果显示"偏距法"几何关系清楚,计算公式简单,并易于用计算机或编程计算器进行数据处理,可以大大降低曲线桥梁墩台中心坐标计算的难度,值得提倡推广应用。

The coordinate of curve bridge piers and abutments center is the most important lofting data of bridge enginee- ring surveying. The commonly-used calculation method is the traverse method, but its calculation steps are tedious. According to the analysis of the relation between pier and abutment center coordinate and line center coordinate, and the calculation thought of ＂method of deflection distance＂ is put forward, in which the coordinate of the central line point is calculated according to the central line mileage, and on this basis, the coordinate is calculated according to the deflection distance from the normal direc- tion of the point towards outward moving. The method is compared with the traverse method in combination with the production practical case calculation. The results show that the ＂method of deflection distance＂ has clear geometric relation and easy calcula- tion formula, is easy to use in computer or programmable calculator for data processing, and can greatly reduce the difficulty of the coordinate calculation of the curve bridge pier and abutment center. It is worth advocating and promoting.