改扩建高速公路凸型竖曲线半径不足时出入口设置位置的探讨  

Discussion on Location of Entrance Setting With Insufficient Radius of Convex Vertical Curve in Reconstruction and Expansion of Expressway

作　　者：杨忠杰 YANG Zhongjie(China Highway Engineering Consulting Group Co.,LTD.,Beijing 10048,China)

机构地区：[1]中国公路工程咨询集团有限公司,北京10048

出　　处：《铁路工程技术与经济》2024年第2期10-14,共5页Railway Engineering Technology and Economy

摘　　要：早期由于我国经济水平欠发达,整体路网布局欠合理,多数公路在设计时为了降低工程造价而选用较低的平、纵指标,导致目前在改扩建项目中,随着高速公路出、入口数量不断增加,出入口处的纵断面指标多数难以满足《公路路线设计规范》、《公路立体交叉设计细则》要求,大部分设计者仅局限性的运用规范、细则中规定的纵断面指标,并未就满足安全性的前提下对纵断面指标进行验算,导致对既有道路改建较长,工程规模浪费较多,因此有必要对其进行探讨。In the early days,due to underdeveloped economic and the unreasonable layout of the overall road network in China,most highways choose lower horizontal and vertical indexes in order to reduce the engineering cost.As a result,the number of exits and entrances of expressways is increasing continuously in the reconstruction and expansion projects.It is difficult for most of the profile indicators at the exit entrance to meet the requirements of Highway Route Design Code and Highway Three-dimensional Intersection Design Rules.Most designers only limited the use of profile indicators specified in the specifications and rules,and did not check and calculate the profile indicators on the premise of meeting the safety requirements,resulting in longer reconstruction of existing roads and more waste of project scale.Therefore,it is necessary to discuss it.

关 键 词：改扩建项目 高速公路出口 识别视距 凸型竖曲线半径 

分 类 号：U412.3[交通运输工程—道路与铁道工程]