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
Key words
reconstruction and expansion project/highway exit/recognition visual distance/radius of convex vertical curve
维普
万方数据