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US 4,363,200 AGranted
Pre-cast building element and method
AssigneeConstruction Products Research and Development Corporation
InventorJoseph Goldenberg
Life of this patent
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AssigneeConstruction Products Research and Development Corporation
InventorJoseph Goldenberg
Estimating the term…
A precast beam for use in constructing a building includes a substantially flat middle portion extending the length of the beam and upstanding sidewalls on either side of the middle portion defining a trough which also extends the length of the beam; the trough is open at each end of the beam and the beam is provided with tensioned reinforcing rods in the middle portion along its length and a plurality of stress relieving slits spaced along the upstanding sidewalls to prevent camber developing; the reinforcing rods of the beam protrude a selected distance from the ends of the beam; a method of construction is disclosed where forms for the vertical components are set in place, the precast beam is then set in place before the cementitious material is poured into the forms for the vertical components whereby the installation and proper orientation of the reinforcing rods of the precast beam and the flooring as well as the reinforcing rods of the vertical components can be obtained.
A method of forming a building structure of the type having a plurality of substantially vertical components of cast cementitious material for supporting a horizontal surface of the structure comprising the steps of:
A precast member for use in a building structure comprising a substantially flat middle portion extending the length of said member and side wall means extending generally perpendicular to said middle portion on opposite sides thereof along a substantial length of said member, said side wall means defining a trough for receiving cementitious material therein, said flat middle portion having rod means protruding generally vertically therefrom at spaced intervals along the length of said middle portion in said trough defined by said side walls means, said flat middle portion incorporating reinforcing means embedded therein which protrude from the opposite ends of said middle portion, said reinforcing means being metal rods which are prestressed, said flat middle portion having oppositely facing surfaces with said reinforcing rods lying closer to one of said surfaces relative to the other surface, said member further including relieving means to prevent the development of camber in said member, said relieving means being slits formed generally perpendicularly to said flat middle portion in said side walls at spaced apart intervals.
A precast member for use in a building structure comprising a substantially flat middle portion extending the length of said member and side walls extending generally perpendicular to said middle portion on opposite sides thereof along a substantial portion of the length of said member, said flat middle portion incorporating reinforcing means embedded therein which protrude from the opposite ends of said middle portion, said reinforcing means being metal rods which are prestressed, said flat middle portion having oppositely facing surfaces and with said reinforcing rods lying closer to one of said surfaces relative to the other surface, said member further including relieving means to prevent the development of camber in said member, said relieving means being slits formed generally perpendicular to said flat middle portion in said side walls at spaced apart intervals.
Dependencies are inferred from the claim text.