自由流半苜蓿叶立交线形设计探索

针对国内典型立交型式大多数存在交织问题从而影响通行能力与交通安全,介绍了消除交织的新型立交结构———自由流半苜蓿叶立交。研究采用我国规范设计新型立交时匝道段缓和曲线长度不够和跨线桥最大纵坡等问题,达到对新型立交的线形设计进行探索的目的。最后,通过设计案例证明,在我国自由流半苜蓿叶立交结构的线形可行性。

Alignment Design of Free-flow Part Cloverleaf Interchange

As the most of typical interchange have the problem of weaving in China so as to influence the traffic capacity and traffic safety,the article introduces a new interchange structure of the free-flow part cloverleaf interchange which can solve the weaving problem.The article studies the problems that the length of transition curve in the ramp section is not enough and the overpass bridge has the maximum longitudinal slope when a new interchange is designed according to the standards of China,which can achieve the excellent alignment design of a new interchange.The design cases prove that the alignment of free-flow part cloverleaf interchange is feasible in China.