五岔路口立交优化设计——以龙岩市小溪路口为例

The Optimization Design of the Interchange at the Five-way Intersection——A Case Study on Xiaoxi Intersection in Longyan City

随着国民经济的快速增长和居民机动化出行比例的提高,传统的将五岔路口简化为十字路口的方法满足不了交通发展的需求,越来越多的中小城市通过规划建设城市立交来保障路网的畅通。以龙岩市新老城区相接的小溪路口立交改造为例,对路口的现状、改造条件、控制因素进行分析,在原方案的基础上进行优化,提出"双Y型"方案。对比表明,优化后的方案具有解决交通拥堵、工程造价更节约、社会影响更小等众多优点。鉴于此,对优化方案进一步深化,提出标准横断面分配型式并结合现场施工实际提出桥梁布置型式,可为今后中小城市五岔路口立交改造提供借鉴。

With the rapid growth of the national economy and the increase of the proportion of motorized travel,the traditional method of simplifying the five-way intersection into a crossroad can not meet the needs of traffic development.More and more small and medium-sized cities have secured roads by building intersectional traffic faclities.This paper takes the Xiaoxi intersection where between the new and old district in Longyan City as an example to analyze the situation,transformation conditions and control factors of the intersection.Based on the original planning design,the ＂double Y-type＂ design is proposed.The comparison shows that the optimized solution has numerous advantages such as solving traffic jams,saving engineering costs,and having less social impact.In view of this,the optimization plan is further designed： the standard cross-section distribution type is proposed,and the bridge type is put forward in combination with the actual construction of the site,which can provide reference for the future interchange of five-way intersection of small and medium-sized cities.