公路平面线形的一种新设计方法

A New Method for Highway Plane Alignment Design

本文阐述的公路平面线形设计方法,以不完整回旋线与圆弧线组成的曲线作为线形设计的基本单元,它吸取了国外曲线形设计方法的精华,保留了以直线为主的习用设计方法的表达方式,能无限制地设计任何曲线组合线形.在设计高等级公路平面线,特别是设计立体交叉匝道线形时,能显出极大的灵活性.作者根据该设计方法的原理编制的计算机程序,能迅速而高精度地进行各种曲线的路线特征点资料及中心桩坐标与切线方位角的计算.

This paper presents a new design method for highway alignment on plan, which utilizes the combination of arc and incomplete clothoid as the foundamental design unit. The essence of curve-dominant design method widely used abroad is also adopted in this method which takes the form of straight-line expression traditionally used, and can design various combinations of any kind of curves without restriction. The new method shows a great flexibility in plane alignment design of high-class highway, especially in the plane alignment design of ramps. A computer program is developed by the author for this new method to rapidly and accurately calculate the characteristic points on plan and centerline chainages and tangent azimuth angles of various alignments.