斜拉式半立交十字路口概念设计研究

Conceptual Design of Semi-stayed Overpass Intersection

通过对现有的两相位信号控制十字交叉路口的交通流线分析,基于消除左转的思想提出斜拉半立交的概念设计:将左转车流全部环形立交;环形立交在交叉口不设置墩柱,在交叉口设置斜拉索塔;左转车道纵坡3%,从交叉口200 m处提升至立交桥高度.在进行基础设计后采用PTV-VISSIM微观仿真软件进行仿真分析,输出行程时间与延误时间并与不设置半立交的两相位控制十字交叉路口进行对比分析.结果表明:建立斜拉式半立交后,在两相位信号控制的十字交叉口中直行与左转车流的行程时间与延误时间明显降低,提高了交叉口通行能力.

The traffic flow of two-phase signal control intersection was analyzed. Based on eliminating left traffic a conceptual design of cable-stayed interchange was proposed. All left traffic should be eliminated through interchange design. There should be no any pier set at the intersection, but a pylon. Left-turn lane^ longitudinal gradient would be 3% , and the height of interchange would be increased from 200m.After the basic design, the simulation results were analyzed by PTY-YISSIM micro simulation software, and the output travel time and delay time were compared with the output of the two-phase control cross-roads without half-crossing. The results showed that after the interchange, the travel time and delay time of the straight and left turn traffic in the crossroads controlled by the two-phase signal were obviously re-duced ,and the traffic capacity of the intersection was improved.