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最近看到《公路》杂志1983年第7期上登载一篇《垂线外距法布设回头曲线》的文章,看了以后,很受启发,现根据本人在实践中曾用过一种叫“伸头回头弯”的测设方法,觉得比这篇文章介绍的方法还要简便些,特介绍出来抛砖引玉。“伸头回头弯”是以通过双转点之间的基线作为“圆”的割线,其圆心“O”又在基线上,这样布设的回头曲线。“垂线外距法布设回头曲线”实
Recently saw the “Road” magazine in 1983 on the 7th published an article “perpendicular to the line from the law laying back curve” article, after reading, very inspired, according to I have used in practice called “ Stretching ”measuring method, feel more simple than the method described in this article, introduced it in particular. “Remain back to bend” is based on the double line through the baseline between the “round” of the secant, the center of the circle “O” again at the baseline, so laid back the curve. “Vertical line laying method set the curve” reality