一种新的城市道路立交桥分类及编码体系

A New Classidication and Coding System of Urban Interchange

城市道路立交桥的选型是城市立交桥设计与建设前期最重要的环节,而建立城市道路立交桥分类及编码体系是立交桥选型的基础。在分析传统的城市道路立交桥分类体系的基础上,根据立交桥左转匝道的出口方式、入口方式、是否存在小环道、是否存在匝道的交织情况等4个方面对城市道路立交桥的类型进行了重新界定,确立了立交桥的分类体系;根据确定的立交桥类型,采用计算机易于实现且占用计算空间少的二进制编码方式对不同的立交桥形式进行了编码。例举不同的立交桥形式及其编码,发现所采取的编码方式操作简单易行。

The type selection of interchange is the most important link in both pre-construction and design of interchange,and its basis is to establish a system which is used for its classification and coding. On the basis of analyzing traditional urban in- terchange classification system,types of urban interchange are redefined and the interchange classification system is estab- lished according to exits and entrances of the left turning ramp as well as whether existing small ring roads and weaving sec- tion of ramps. After confirming the types of interchange,this paper adopts binary coding method,which is easy for computer to implement and occuping less space,to encode different overpass types. Different interchange forms and coding are illustra- ted. The results show the adopted coding method is simple and easy.