Abstract: Design, fabrication and erection of a lightweight building module in the form of a ribbed concrete floor slab with lightweight thin concrete wall panels and ceiling panel reinforced by a series of spaced rigid annular open web frames. Each frame includes a floor reinforcing member, two side wall reinforcing member, and a ceiling reinforcing member, rigidly welded together at their adjacent ends. Each reinforcing member is an open web joist having two parallel straight rods spaced apart by an open web member formed by bending a rod in a zig-zag pattern. Longitudinal spacing of adjacent bends is greater in the central portion than the ends of the reinforcing members. A poured concrete roof slab is formed with integral reinforcing ribs by means of rectangular spacers made of light weight material.

Abstract: A prefabricated building module comprising at least two side-walls, a ceiling, and a floor. In one embodiment of the building module, the walls, ceiling and floor each include a thin, continuous layer of a concrete-like material having spaced-apart, open web bar girders embedded in one surface thereof. The two side-walls, the ceiling and the floor are assembled together with the bar girders extending outwardly and are rigidly attached to one another, for example, by welding the ends of the bar girders to one another, thus forming a rigid, box-like building module. The building modules can be formed into a building by placing one layer of building modules with one side-wall of each module adjacent to but spaced-apart from one side-wall of a different module.

Abstract: A prefabricated building module comprising at least two side-walls, a ceiling, and a floor. In one embodiment of the building module, the walls, ceiling and floor each include a thin, continuous layer of a concrete-like material having spaced-apart, open web bar girders embedded in one surface thereof. The two side-walls, the ceiling and the floor are assembled together with the bar girders extending outwardly and are rigidly attached to one another, for example, by welding the ends of the bar girders to one another, thus forming a rigid, box-like building module. The building modules can be formed into a building by placing one layer of building modules with one side-wall of each module adjacent to but spaced-apart from one side-wall of a different module.