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河北省今年进行路况登记时,对现有路线运用 R=C~2+4M~2/8M 公式推算出半径。后来制了一张曲线图,用于求Ⅳ级路以下的不合理半径及半径时颇感方便。现在就把这种平曲线简易施测曲线图介绍给大家,不妥之处希予指正。使用时,先决定适当的弦长,再把弦的两端固定在路基外侧边缘(或行车轨迹之外边)上,由弦之中点用直角三角形法量出M值,即可得出曲线半径。
When carrying out traffic registration this year in Hebei Province, the radius is calculated using the formula R = C ~ 2 + 4M ~ 2 / 8M for the existing route. Later made a curve for the level below the irrational radius and radius of the road quite convenient. Now put this flat curve simple test curve introduced to everyone, I hope to correct the wrong place. When used, first determine the appropriate chord length, and then fixed at both ends of the string on the outer edge of the subgrade (or the outside of the driving path), measured by the midpoint of the triangle right angle triangle M value, you can draw the curve radius .