Abstract: A prefabricated support and covering structure for making artificial tunnels, small bridges, and the like, is comprised of a plurality of modular bodies each of which consists of a plurality of prefabricated reinforced concrete panels interconnected by reinforcing rods so that upon lifting of the center portion of each modular body the prefabricated panels will fold about hinges defined by the reinforcing rods. The reinforcing rods are disposed at angles relative to each other and intersect along a line parallel to the axis of the structure, which line defines the hinge axis. Each prefabricated panel of reinforced concrete has abutting edges and the gap between the confronting faces of the panels is filled with binding material. The modular bodies are each provided with lateral flanges to define a space between the lateral spaces of adjacent bodies which is also filled with a binding material to unite the modular bodies to each other.