改扩建公路超高设计中若干问题的探讨

超高设计是道路曲线路段的重要设计内容,也是行车安全性和舒适性的重要影响因素,在高等级公路改扩建应用中尤为重要。基于S226省道温岭岙环至玉环龙溪段拓宽改造项目,结合JTG D20—2017《公路路线设计规范》道路超高设计的相关规定,针对改扩建公路中分离式路基超高线形设计方法、S型曲线超高设置、曲线内构造物超高验算以及老路路拱过渡等特殊超高问题,提出新老路间的差异平稳过渡方案,借以探讨改扩建公路超高设计的思路和方法。

Discussion on Some Problems of Superelevation Design in Highway Reconstruction and Extension

Reasonable superelevation design is an important basis for driving safety and comfortablity in curve sections,which is particularly important in highway reconstruction&extension.Based on a project case,the reconstruction project of provincial road S226 from Wenling Aohuan to Yuhuan Longxi Section,and relevant provisions of Design Specification for Highway Alignment(JTG D20-2017),this paper puts forward a smooth transition solution of the diversity between the new path and the old path,which is used to solve the problem of superelevation design in separated roadbed,superelevation design of S-curve,superelevation calculation of structures in the curve,and special superelevation of crown transition of the old path,so as todiscuss the idea and method of superelevation in highway reconstruction&extension.