摘要
介绍了典型线网的布置原则和评价,即"路径最短,换乘最少"。通过各种线形功能和适用性的特征分析,对构筑线网的基本形态分类、归纳交点计算公式、分析典型线网及线形的适用性和规律性,尤其是在环线的适用性方面提出了新的认识。认为放射形线网是最基本的典型线网;直线棋盘形线网比较吻合棋盘形城市的布局形态;环线形线网应因地制宜,用于放射形线网或棋盘形线网核心层的外围。
The principle for a typical URT network planning can be defined as "the shortest path, the least transfer". Based on the characters of urban rail transit network (URTN) both at home and abroad, the author analyzes the structures and functions of different lines. According to the yearly accumulated experiences, this paper also makes a classification for the basic form of URTN and summarizes a formula for the calculation of its intersection. In line with the applicability and disciplinary of a typical URT network, two issues about the circle lines shall be luther discussed:one is the line structure and the other is the diameter and length. The author argues that the suitable diameter is about 10 km and should not be less than 6 km if it' s limited by the terrain eonditions, thus at least 2 to three lines at the interval of circles shall be preserved. This circle can be roundish or square and the entire length shall be 30-40 km. This paper gives a certain inspiration and guidance to the basic design eoncepts and methods of URT network.
关键词
城市轨道交通
线网规划
结构形态
基本线形
交点计算
urban rail transit
network planning
structure
basic line
intersection calculation