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关于用量距法测定平曲线偏角,过去都是用的五尺法,即首先自角点起向直线的延长线与折线方向各量5米。根据我的体会与测算的结果,觉得五尺法可以改进为十尺法即自角点向两线方向各量10米(限于地形者例外)。因为量距定角法系利用正弦函数先求出偏角之半,即:sinθ/2=b/a(如下图,θ即偏角,b即AB之半),因a大于b(斜边大于任一直角边),即函数b/a小于1。故若a为5,则函数尚待相除始得,但若a为10,则函数一量即得。例如b若量
On the use of distance method of measuring flat curve declination, the past are used five feet method, that is, first from the corner to the straight line extension line and polyline direction of the amount of 5 meters. According to my experience and the calculation results, I think the five-foot method can be improved to ten feet method that is from the corner to the two directions of the amount of 10 meters (limited to terrain exception). Because the distance between the fixed angle method using the sine function to find the first half of the declination, that is: sin θ / 2 = b / a (as shown, θ is the declination, b is AB half) Greater than any right angle), that is, the function b / a is less than 1. So if a is 5, the function has yet to be divided to get, but if a is 10, the function of a volume that is. For example b if the amount