近年来越来越多的城市隧道和高速公路隧道在入洞口设置了减光棚装置,用来降低“黑洞效应”及低角度阳光眩光效应,从而提高隧道入口段的行车安全。现有的减光棚存在着路面均匀度差、明暗条纹、路面亮度不均匀等不良情况,给行车带来了一定的负面影响。在综合考虑隧道减光棚安全性和舒适性的基础上,基于光扩散板的多光源效应,提出了降低减光棚负面影响技术,构建了减光棚日光直射数值分析模型,在减光棚顶部布设光扩散板,将日光充分扩散后照射到棚下路面,从而避免太阳直射路面导致的不良现象,通过室内试验和数值分析方法进行光学分析研究。结果表明:在光扩散板的作用下路面亮度均匀度在0.7~0.95,满足设计规范要求,能避免出现明暗条纹等不良现象,保证了隧道洞口处的行车安全和舒适性;由于采用自然光线提供光通量,可以通过光扩散板的布设面积控制棚下路面的亮度等级,降低了隧道照明系统的碳排放,实现了安全、舒适与低碳环保的统一。
In recent years, more and more urban tunnels and highway tunnels have installed light sheds at the entrance to reduce the "black hole effect" and the low-angle sunlight glare effect, so as to improve the safety of the tunnel entrance section. The existing light sheds have poor uniformity of the road surface, bright and dark streaks, uneven brightness of the road surface and other undesirable conditions, bringing a certain negative impact on driving. On the basis of the safety and comfort of tunnel light sheds, based on the multi-source effect of light diffusion panels, a technology to reduce the negative impact of light sheds was proposed, construct a numerical analysis model of direct sunlight on light sheds, and lay light diffusion panels on the top of light sheds to fully diffuse the sunlight and then irradiate it to the road surface under the sheds, so as to avoid the undesirable phenomena caused by direct sunlight on the road surface, and conduct an indoor test and numerical analysis method. The optical analysis study was conducted by indoor test and numerical analysis. The results show that: the brightness uniformity of the road surface under the action of light diffusion plate is 0.7~0.95, which meets the requirements of the design specification, avoid the appearance of bright and dark streaks and other undesirable phenomena, and ensure the safety and comfort of the traffic at the tunnel entrance; due to the natural light provides luminous flux, the brightness level of the road surface under the shed can be controlled by the area of light diffusion plate, which reduces the carbon emission of the tunnel lighting system and achieves safety, comfort and low carbon environmental protection unity.
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