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通常我们在测量实习时,对中桩弯道放样都是采用新切线法与延线支距法的,如果这两种方法不能解决的问题,再用经纬义偏角法来测定的。可是目前我们的经纬仪还不能满足需要,于是我们试行用小平板作图法来代替经纬仪的偏角法(注)。这种方法经过测量实习,认为速度快,操作简单,不受新切线法及延线支距法的条件限制;又不多计算和查表,虽精度不及经纬仪高,和上述相比,适合于低级公路,现介绍于下: 一、图的绘制以设计的半径R选择适当的比例尺画一半圆弧,依据R的大小确定整弦长度,以折线的一段弧长AB=K(曲线长)见图1。A点B.C.作为曲线起点,
Usually when we measure the internship, the curve setting of the middle pile adopts the new tangent method and the extension of the line method. If these two methods can not solve the problem, then use the positive and negative declination method to determine. However, at present, our theodolite can not meet the needs, so we try to use the tablet mapping instead of the theodolite declination method (Note). This method after measuring practice, that the speed, easy to operate, not subject to the new tangent method and the extension of the line of law conditions; not more calculations and look-up table, although not as accurate theodolite high, compared with the above, suitable for Low road, are introduced below: First, the drawing of the drawing to design the radius R Select the appropriate scale to draw a semi-circular arc, according to the size of the R to determine the length of the whole string to a broken arc length AB = K (curve length) See figure 1. A point B.C. as a starting point for the curve,