Abstract: A method of manufacturing reinforced structures wherein a hardened steel shell is constructed to desired specifications and anchored to a structure's foundation. The remainder of the structure is constructed around the hardened steel shell, thereby incorporating the steel shell as an integrated room or section of the structure.

Abstract: An apparatus for manufacturing reinforced structures wherein a hardened steel shell is constructed to desired specifications and anchored to a structure's foundation. The remainder of the structure is constructed around the hardened steel shell, thereby incorporating the steel shell as an integrated room or section of the structure.

Abstract: A ladder-type cable tray system comprising a first cable tray section and a second cable tray section. Each cable tray section includes first and second rails extending lengthwise of the section at opposite sides of the section and a plurality of rungs extending between the rails at intervals spaced lengthwise of the section. Each of the first and second rails has a tubular portion forming a hollow beam extending the length of the rail. The tubular portion has open ends at opposite ends of the rail and a rung-supporting portion integrally formed as one piece with the tubular portion and depending therefrom. The system further comprises fasteners for securing the rungs to the rung-supporting portions of the first and second rails in a position wherein the rungs span the rung-supporting portions, and a plurality of splices for connecting the first and second cable tray sections end to end.