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公路曲线形设计方法因为具有布线灵活、能根据需要构造任意复杂的组合线形的优点,已被引入我国公路匝道的线形设计中.然而,不论是利用手工查表计算,还是采用已有的电子计算机程序(例如国家七五攻关成果《路线CAD系统》)设计,首先都应该进行匝道方案的布置与比选,确定各线形元素(直线、圆曲线与回旋线)的大致位置和精确计算圆曲线半径R、回旋线参数A、回旋线长度L等特征值. 本文介绍一种匝道布线的作图法,设计者可根据布线元素(直线或圆曲线)的位置,在运用计算机程序计算出回旋线的精确A值后,仅仅利用直尺、圆规和普通曲线板(云形规)即可足够准确地画出立交匝道布线图.
The road curve design method has been introduced into the linear design of the highway ramp in our country because it has the advantages of flexible wiring and the ability to construct any complicated combination line according to the need.However, no matter using manual look-up table calculation or using the existing electronic computer Procedures (such as the National Seventy-five research project “route CAD system”) design, first of all should be ramp layout and comparison programs to determine the approximate location of each linear element (straight line, circular curve and the swing line) and accurate calculation of the radius of the circular curve R, cyclotron parameters A, the length of the cyclotron L. The paper introduces a ramp routing mapping method, designers can route elements (linear or circular curve) of the location, the use of computer programs to calculate the swing line After the accurate value of A, the wiring diagram of the interchange ramps can be drawn accurately enough only using rulers, compasses and normal curves (cloud gauges).