Metal working – Method of mechanical manufacture – Shaping by direct application of fluent pressure
Patent
1987-04-08
1988-09-20
Silbaugh, Jan H.
Metal working
Method of mechanical manufacture
Shaping by direct application of fluent pressure
295272, 264155, 264228, 264262, 264263, 264512, 264576, 264570, B23P 1700, B28B 130, B28B 148, B29C 4514
Patent
active
047715308
ABSTRACT:
Methods for forming prestressed concrete members wherein a pressure-containing casing is disposed around the outside surface of the concrete member and is spaced therefrom so that a cavity is formed between the casing and the outside surface of the concrete member. A pressurized medium is injected into the cavity between the casing and concrete member at a pressure sufficient to apply the required prestressed compressive force to the outside surface of the concrete member. The pressurized medium changes form by hardening or solidifying after injection. Examples of solid pressurized mediums include cement-like grouts and plastic, and epoxy resin materials. When the concrete member is cast within the casing so as to be in intimate contact with the casing the cavity is then formed by peeling the concrete member and casing away from each other as the pressurized medium is injected therebetween.
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Brochure: "Prestressed Concrete Cylinder Pipe", published by Ameron Pipe Products Group of American Pipe and Construction International, (6/74), 4 pages.
General Atomics
Kutach Karen D.
Silbaugh Jan H.
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