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本文是解决工作中实际问题的一个办法,并非最佳方案,供解决类似问题参考。曲线放样如图示,图中给出了转盘圆心坐标及其内、外径,与之相接的道路中线上的两点坐标,路宽及路边线与转盘外圆连接的曲线半径。转盘与各路口连接则构成了若干反向曲线,如图中的BCDE曲线。放样该曲线重要的是先要确定C、D点的位置,由于C、D点是两圆的切点,分别位于圆心O与圆心O_1和O_2的连线上,当圆心O可以设站时,能较方便地以图解法或解析法确定C、D点位置及
This article is a solution to the practical problems in the work. It is not the best solution for solving similar problems. Curve lofting is shown in the figure. The coordinates of the center of the turntable and its inner and outer diameters are shown in the figure. The coordinates of the two points on the middle line of the road with which they are connected, the width of the road and the radius of the curve connected to the outer circle of the turntable. The turntable is connected with each intersection to form a number of reverse curves, such as the BCDE curve in the figure. The important thing for setting out the curve is to first determine the positions of points C and D. Since points C and D are the cut-points of two circles, they are respectively located on the connecting line between the center O and the center O_1 and O_2. When the center O can be set, Graphical or analytical methods can be used to determine the location of points C and D and