论万家寨引黄工程施工图控制点坐标转换

Discussion on Coordinate Conversion of Control Points in Shop Drawing of the YRDP

远距离、长隧洞、大高差的万家寨引黄工程 ,是在海拔 90 0m至 1890m的高山中进行施工的。而工程施工总图是在国家 1/ 10 0 0 0的地形图上 ,海拔为零的高斯平面上进行设计的 ,由于地球是一个表面起伏不平的和曲率半径不同的椭球体 ,致使地面同一建筑物在施工平面上的投影长度不同于设计平面上的投影长度。本文根据大地测量学原理 ,论述了万家寨引黄工程施工图中控制点坐标转换的目的 ,认为应以工程主要建筑物———隧洞的横向测量误差来确定投影长度变形值 ,再根据投影长度变形值来确定多个投影带及多个投影高程平面。

According to the principle of geodetic surveying, this paper discusses the purpose of the coordinate conversion of the control points in the shop drawing of the YRDP; The author hold that the deformed value of the projection length should firstly be determined with the lateral survey error of the main building in the project namely tunnel, then the projection tape and the projection elevation planes be determined with the deformed value. This paper also introduces the formulation and the method to carry out the caluclation for the coordinate of control points in the shop drawing of the YRDP.