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“公路”月刊1957年第12期登载的“测定道路曲线横断面”一文,所介绍的方法主要是为了找寻弯道上任一点的横断面方向,简单适用,但它有一个缺点,就是必须要知道一条切线,并且在测比较大一点的弯道横断面时,从起点测到终点要产生不小的累计误差。如只需要补测某一桩的横断面,也要从起点、终点、中点的已知切线方向测起。这是比较麻烦的。为此,本人提出以下方法,供参考。 1.论据:圆弧的圆周角等于该圆弧的弦切角。 2.使用工具:只需要一个十字架(方向架),并在其上做一个在水平方向可转动的木条。木条的转动不要太灵活,在木条上钉一小钉,以便观测。
The article “Measuring the Cross-section of Road Curves” published in the “Road” magazine, No. 12, 1957, is mainly intended to find the cross-sectional direction at any point on the curve and is simple to apply. However, it has a drawback that it is necessary to know A tangential, and measured in the larger corner of the cross-section, measured from the starting point to produce a small cumulative error. If only the need to make up a cross-section of the pile, but also from the starting point, the end point, the midpoint of the known tangential direction measured. This is more troublesome. To this end, I propose the following method for reference. 1. Argument: The circumferential angle of an arc is equal to the chord cut angle of the arc. 2. Use tools: only need a cross (the direction of the frame), and in it to make a horizontally rotatable wood. Do not be too flexible wood rotation, nail a small nail in the stick, in order to observe.