修建渠道、道路、隧洞等建筑物时，从一个直线方向改变到另一直线方向，需用一曲线连接，使路线沿曲线缓慢变化。常用的曲线是圆曲线。圆曲线的放样有两种方法：一是查表法；二是用仪器测量法。这两种方法都很精确，但在现场实地操作很不方便。下面，介绍一种简便易操作的... When constructing buildings such as roads, roads, tunnels, etc., changing from one straight line to another straight line requires connecting with a curve so that the curve changes slowly along the curve. Commonly used curve is a circular curve. There are two ways to round the curve lofting: First, look-up table method; Second, the instrument measurement method. Both of these methods are accurate, but on-site operations are inconvenient. Below, introduce a simple and easy to operate ...