A tunnel structure (10) is described comprising a plurality of cover support members (14) and a cover material (16) supported by and extending over the cover support members (14), the cover support members (14) being of generally arcuate profile and including an upwardly projecting hump (14c), the humps (14c) of the cover support members (14) being aligned with one another such that the cover material (16) defines a ridge (16a) having sides that are more steeply sloped, in use, than the parts of the cover material (16) adjacent the ridge (16a).

The invention relates to a device for forming a canopy over a region in the outdoors, comprising a flat element and a support assembly with supports, wherein the support assembly can be anchored to a ground surface of the region, and wherein the flat element supported by the support assembly functions to form an areal protective canopy over the region, wherein a section of the flat element extends along a ridge region of the protective canopy. According to the invention, a solar cell module is provided, which is connected to the flat element, such that, with light irradiation on the solar cell module, light energy can be converted into electrical energy, wherein a quick-closure mechanism comprising zip-closure mechanism with a zip-closure unit are provided, in order to detachably arrange a solar cell module on the flat element using the zip closure mechanism.