互通立交设计中存在的问题及优化设计  

Problems in Interchange Design and Optimization Design

作　　者：徐旺 李鑫鑫 Xu Wang;Li Xinxin(Shandong Provincial Communications Planning and Design Institute Group Co.,Ltd.,Jinan 250031,China)

机构地区：[1]山东省交通规划设计院集团有限公司,济南市250031

出　　处：《北方交通》2022年第2期47-49,共3页Northern Communications

摘　　要：针对互通立交设计中存在的环形匝道圆曲线半径设计未预留主线改扩建空间、单车道出入口的双车道匝道渐变段长度未结合设计速度差异化取值、左转匝道平面圆曲线半径取值偏小导致的停车视距不足等问题,提出根据主线车道数适当增大环形匝道圆曲线半径、根据设计速度动态确定匝道渐变段长度、根据停车视距选取对应平面圆曲线半径的优化设计方法,为设计人员在设计指标选取时提供参考。In view of the problems existing in the design of interchange,such as the circular curve radius of the ring ramp is not reserved for the reconstruction and expansion space of the main line,the length of transition section of two lane ramp at the entrance and exit of single lane is not combined with the differential value of design speed,and the insufficient stopping sight distance is caused by the small value of plane circular curve radius of left turn ramp,the optimal design method is put forward according to the number of main lanes to properly increase the circular curve radius of loop ramp,according to the design speed to dynamically determine the length of ramp transition section and according to the stopping sight distance to select the corresponding plane circular curve radius,so as to provide reference for designers in the selection of design indexes.

关 键 词：互通立交设计 匝道 圆曲线半径 渐变段 停车视距 

分 类 号：U412.352.1[交通运输工程—道路与铁道工程]