枢纽型互通式立交的构思

Design Conception of Hub Intercommunication Overpass

研究目的:随着社会经济的发展,道路建设日新月异,枢纽型立交建设越来越多,为方便掌握该类型立交的构思,笔者从功能定位、通行能力、立交线形等方面,总结枢纽型立交的主要特点;从环境以及景观的协调性、节约用地"科学发展观"等方面,归纳枢纽型互通构思的主要考虑因素;通过项目实例,结合立交选型的控制条件,分析三路以及四路枢纽立交构思的一些技巧,供类似工程借鉴。研究结论:(1)每座枢纽立交所处的自然环境、功能定位、远景交通量等条件不尽相同,应着眼于主要控制条件来构思;(2)立交选型示例是有选择性的,采用时,一定要照顾到驾驶人习惯,除了三路交叉定向Y型以外,匝道尽量不要在主线上左出;(3)对于承担大容量交通的骨干立交,立交范围内的主线车道数应连续,这样才能充分发挥其功能;(4)对于改建工程、既有工程宜布置在新建道路的一侧,并根据立交层次综合选型。

Research purposes： With the development of society and economy, the road design and construction change quickly, and meanwhile, the more and more hub intercommunication overpasses are built. In order to know the design conception conveniently, this paper summarizes the main characteristics of hub intercommunication overpasses in the aspects of functional orientation, traffic capacity and line font, concludes the main factors to be considered in design of the hub intercommunication overpass in the aspects of the coordination between the environment and landscape and the saving land, and analyzes the design skills of three -way -cross and four- way- cross hub intercommunication overpasses by giving the example reference to the type selection of on considering of the control conditions hub intercommunication overpass. These experiences can provide the beneficial Research conclusions： （ 1 ） Each hub intercommunication overpasses should be designed on consideration of its main control conditions because of the different natural environments, different functional orientations and different traffic volumes in future. （2） The overpass type is optional, so the driver behavior should be considered in design. For example, the ramp exit should not be built on the left of main lane except for the three - way - cross ＂Y＂ type overpass. （3） To the overpass located on trunk highway with big traffic volume, the number of main lanes within the overpass should be consistent to give full play of them. （4） To the reconstruction projects, the existing structures should be located on the same side of new road, and the number of level should be considered comprehensively in the type selection.