道路立交平面线形圆心连线闭合导线设计法

互通式立交平面线形的复杂性使得采用传统的直线型设计方法难以满足设计要求。笔者提出了一种线形圆心连线闭合导线设计法。首先根据缓和曲线瞬时圆心轨迹的参数方程,推导出其性质,然后将瞬时圆心和已知的两条主线连接起来形成闭合导线,根据各种曲线组合情形,寻求相应的计算方法,利用缓和曲线的求解方法,可以进行立交平面线形的设计和计算。该方法通过实例得到了应用验证。

Closed-traverse method of center-center lines of circles in horizontal alignment design of road interchange

The paper puts forward closed - traverse method of the lines of osculation and the closed - traverse method of the center - center lines of the circles. Based on the parameter equation of the track of the instantaneous center of thecircle of the easement, its characters can be obtained, and then the lines of osculation and two through lines knowm commected to form the closed - traverse. According the arious compound styles,corresponding methods can be found . Adast,des,ign and calculation of horizontal alignment of interchange can be accomplished by using the calculating methods of easement alignment The design methods has been approed by examples.