改扩建公路超高设计中若干问题的探讨

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

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。

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.