Symmetrical arch rib type gradual change tunnel shading shed

The utility model discloses a symmetrical arch rib type gradual change tunnel shading shed which comprises a framework assembly forming tunnel cambered surface support and multiple layers of gradual change glass installed on the framework assembly, and hedge belts are arranged on the two sides of a tunnel road covered by the gradual change glass. The utility model discloses a symmetrical arch ribtype gradual change tunnel shading shed. Through a gradual change light environment adaptation channel, the sight of a driver is in slow transition; dimming design is carried out at a tunnel portal; the brightness difference inside and outside the tunnel portal is alleviated; the illumination brightness of the area near the tunnel portal is reduced, the visual adjustment time of a driver is prolonged, smooth transition of the bright and dark environment is achieved, the tunnel driving environment of an expressway is effectively improved, the driving safety of the driver is improved, and traffic accidents caused by sud