重庆海天堡特大断面城市隧道入口段照明灯具最佳初始安装位置研究

Study on the Best Initial Installation Position of Lighting Lamps in the Threshold Zone of Extra Large Section Urban Tunnel

特大断面城市隧道入口段受洞外自然光影响较大,其照明灯具初始安装位置是保障行车安全和照明节能的关键参数。本文以特大断面(横断面面积达145.91 m^(2))城市隧道重庆海天堡隧道入口段为例,分别测得不同天空类型、不同时刻条件下的隧道洞外亮度L_(20)(S)值以及自然光在入口段的分布规律,将最不利照明条件、自然光影响纵深与入口段照明需求相结合,得到了重庆海天堡隧道入口段照明灯具的最佳初始安装位置,即云天、阴天、晴天天空最不利条件下,最佳初始安装位置分别距洞口25 m、30 m、27 m。

The threshold zone of extra large section urban tunnel is greatly affected by the natural light outside the tunnel.The initial installation position of lighting lamps is the key parameter to ensure driving safety and lighting energy saving.Taking the threshold zone of Chongqing Haitianbao tunnel as an example,the Luminance L_(20)(S)outside the tunnel and the distribution law of natural light in the threshold zone under different sky types and different time conditions are measured respectively.The best initial installation position of lighting lamps in the threshold zone of Chongqing Haitianbao tunnel is obtained by combining the most unfavorable lighting conditions,the influence depth of natural light and the lighting demand of the threshold zone,that is,under the most unfavorable conditions such as cloudy,cloudy and sunny days,the best initial installation position is 25 m,30 m and 27 m away from the portal respectively.