隧道出口减光防眩设计

以甘肃省某高速公路隧道洞口为例，通过对几种不同洞门减光防眩构造物（遮光棚、遮阳棚、遮光板）的比较研究，指出遮光棚不仅可解决减光过渡的问题，还可达到防眩的效果；通过对2种不利工况的分析，得出20°入射角是导致驾驶员失能眩光的角度。提出了遮光棚设计应注意的事项，如拱肋间距、铝合金管环向间距、亮度等。

Design of Light-weakening and Anti-glare Structure at Tunnel Portal

Taking the light weakening and anti glare design of an expressway tunnel portal in Gansu, China as an example, the authors make the comparative analysis on the operational performance of different kinds of light weakening structures at tunnel portal. The analysis results show that light weakening shed can not only solve the problem in the transition section of light weakening, but also has anti glare effects. Then, the authors, by analyzing on two adverse working condition, put forward that  20°angle of incidence is the angle that induces the glare of drivers, and the points to which attention should be paid for light weakening shed design, such as arch ribs interval, circumferential spacing of aluminium alloy pipes and luminance.