土木建筑工程,采用大跨度拱结构是经常遇到的.工程设计完成后,把图纸上的形状变为实际的东西,一定要进行曲线放样.但跨度大则半径也大,大的半径要直接画出曲线是比较困难的.目前除了采用“座标法”外,还有“延弦法”,“偏角法”.这些方法事先需要较麻烦的计算,工作量大,不便工人掌握.随后又有“弦点法”.“弦点法”是几何作图法.这种方法不需要计算 Civil engineering, the use of large-span arch structure is often encountered.Engineering design is completed, the drawings on the shape into the actual thing, must curve out.But the span is large, the radius is large, large direct Draw the curve is more difficult. In addition to the current “coordinate method”, there are “extended string method”, “declination method.” These methods require more cumbersome calculations in advance, heavy workload, not easy for workers to grasp. Another “string point method.” “String point method” is the geometric mapping method. This method does not require calculation