互通式立交匝道起点瞬时纵坡计算分析

摘要

由于国内设计规范中并未明确道路互通式立交匝道鼻端纵坡的计算方法, 因此, 以宜黄公路立交A匝道为例, 选取间距1 m和5 m, 采用瞬时纵坡法对匝道起点进行纵坡计算, 同时结合项目实际, 分别对设置路拱和不设路拱两种情况进行匝道起点纵坡计算与分析取值, 以便为互通立交匝道纵坡设计提供参考.%The calculation method of longitudinal slope at the starting point of interchange ramp is not specified in the design code of China. Therefore, taking the A Ramp of Yihuang Highway Interchange as an example, and selecting the spacing 1 m and 5 m, the longitudinal slope at the starting point of the ramp is calculated by the instantaneous longitudinal slope method. Combined with the actual project, the calculation and analysis of the longitudinal slope at the starting point of ramp are carried out for two conditions of setting the road arch and not setting the road arch so as to provide the reference for the design of the longitudinal ramp of the interchange.