城市道路圆曲线加宽精细化设计  

Detailed design on circular curve widening of urban road

作　　者：彭勃睿 Peng Borui(Changsha Planning and Design Institute Co.,Ltd.,Changsha 410007,Hunan)

机构地区：[1]长沙市规划设计院有限责任公司,湖南长沙410007

出　　处：《工程建设》2020年第3期33-37,共5页Engineering Construction

摘　　要：针对城市道路圆曲线加宽设计中内侧加宽车道中线与道路中线不重合、两侧加宽中线外侧车道线形不顺畅、加宽缓和段车道分界线线型不合适等3个问题,指出加宽缓和段车道分界线的适当线型是中线内侧为回旋线中线与四次抛物线加宽的组合线,中线外侧为回旋线。指出圆曲线加宽精细化设计的3个要点是车道中线与道路中线重合;中线外侧车道行车轮迹顺畅;加宽缓和段的车道宽度为逐渐递增。并说明满足该3个要点的关键是控制圆曲线内移值大于外侧车道总加宽值和采用适当加宽缓和段车道分界线线型。Three problems are pointed out in the current design of the circular curve widening of urban road:the center line of lane widening inside is not coincident with that of the main lane,the lane alignment outside the center line after widening on both sides of the lane is not smooth,and the lane boundary line of lane widening transition section is not suitable.The appropriate line type to widen the lane boundary in the transition section is given:the inner side of the center line is the widened combination line of the cycloid center line and the quartic parabola,and the outer side of the center line is the cycloid.Three key points of detailed design of circular curve widening are put forward:the center line of the widened lane coincides with the center line of the main line,wheel tracks on the outside lane of the center line should be smooth,and the lane width of the widening transition section increases gradually.It also explained that the key to meet the three requirements is to control the inner shift value of the circular curve to be greater than the total widening value of the outer lane,and to adopt the appropriate lane boundary line of the widening transition section.

关 键 词：城市道路 圆曲线 加宽 加宽缓和段 车道分界线 

分 类 号：U412.37[交通运输工程—道路与铁道工程]