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文章通过对互通立交的平面线形进行分析,将其分解成直线、圆曲线和缓和曲线三种基本线形单元,利用设计文件提供的各线形单元起终点桩号、坐标及偏转方向,反推出线形单元要素,然后利用弦切角计算出单元起点-终点、起点-P点的坐标方位角和P点切线方位角,计算出起点-P点的距离,进而推导计算出P、任意角度横向点H的坐标,为边桩和桥梁桩位的放样计算提供了依据。根据这一原理编制了程序计算框图,为互通立交放样程序编制提供了参考。
By analyzing the flat line shape of the interchange, this paper decomposes it into three basic linear units: straight line, circular curve and easing curve. Using the linear units provided in the design document as the ending point, coordinate and deflection direction, linear units Elements, and then use the chord cut angle to calculate the unit starting point - the end point, the starting point-P point of the azimuth and the tangent of the azimuth P point to calculate the distance from the starting point-P point, and then derive to calculate P, any angle horizontal point H The coordinates provide the basis for setting out the stake of pile and bridge. According to this principle, the program calculation block diagram is compiled, which provides a reference for the procedure of setting out the sample for the interchange.