弯道曲线是路线工程改变方向时必不可少的一种形式,在水利渠道和交通道路上随时都可遇到。测量曲线的方法很多,诸如:偏角法、切线支距法、中央纵距法、长弦纵距法等。在水利建设中通常采用偏角法测设圆曲线。偏角法虽有不少优点,但也有其缺陷和不足。例如在测设盘山路线工程时,由于自然条件限制,地形变化复杂,虽然设计人员极力想 Curved curve is an indispensable form of change direction of route engineering, which can be met at any moment on the water conservancy canal and traffic road. Many ways to measure the curve, such as: declination method, tangent offset method, the central longitudinal distance method, long string longitudinal distance method. In water conservancy construction, the declination method is usually used to measure the circular curve. Although the declination method has many advantages, but it also has its shortcomings and deficiencies. For example, in measuring the Panshan route project, due to natural conditions, the terrain changes complicated, although the designers tried hard to think