菱形立交桥下十字平交口左转车辆行驶轨迹对桥梁跨径影响研究  

Study on the Influence of Left Turning Vehicle Trajectory on Bridge Span at the Cross Intersection Under the Diamond Interchange

作　　者：尹万辉 蔡竣安 王大为 YIN Wanhui;CAI Jun′an;WANG Dawei(Wenzhou Traffic Planning and Design Institute,Wenzhou 325000,China;Rui'an Transportation Engineering Construction Center,Wenzhou 325000,China)

机构地区：[1]温州市交通规划设计研究院有限公司,浙江温州325000 [2]瑞安市交通工程建设中心,浙江温州325000

出　　处：《国防交通工程与技术》2024年第3期29-32,共4页Traffic Engineering and Technology for National Defence

摘　　要：近年来一级干线公路与地方道路菱形立交的情况越来越多,常规设计中往往对菱形立交桥下平交口行驶轨迹分析不到位,主线跨线桥布置多考虑被交路的建筑限界要求而忽略了转弯行驶的需要,导致设计缺陷。模拟对向左转弯车辆临界相切轨迹,得到中央分隔带宽度、两对向左转车道停止线之间的净距和转弯半径关系方程。计算分析表明:满足左转通行要求的轨迹曲线半径及跨线桥梁跨径由中分带宽度B、道路夹角α来确定。桥下十字型平面交叉口设计需先行计算对向左转弯车辆切点间最小净距L,据此合理确定上部桥梁跨径,如此才可保证桥下平交口的安全运行。In recent years,there have been more and more diamond-shaped interchanges between first-class arterial highways and local roads.However,in conventional design,the driving trajectory of the cross intersection under the diamond overpass is often not well analyzed.The arrangement of the mainline overpasses often prioritizes the building boundary requirements of the intersecting roads,while overlooking the need for turning movements,leading to design defects.This paper simulates the critical tangent trajectory of vehicles turning left,and obtains the relationship equation between the width of the central divider,the clear distance between the two pairs of left-turn lane stop lines,and the turning radius.The calculation and analysis show thatthe radius of the trajectory curve and the span of the bridge that meet the requirements for left-turn traffic are determined by the width B of the center strip and the intersection road angle α.The design of cross intersections under the bridge requires prior calculation of the minimum clear distance L between the tangent points of left-turning vehicles,based on which the upper bridge span can be reasonably determined.Only in this way can the safe operation of the intersection under the bridge be ensured.

关 键 词：菱形立交 桥下十字平交口 左转车辆 行驶轨迹 桥梁跨径 

分 类 号：U412.351[交通运输工程—道路与铁道工程]