Plastic and nonmetallic article shaping or treating: processes – Forming stressed concrete articles
Patent
1979-10-09
1981-06-16
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Forming stressed concrete articles
264333, 264DIG43, B28B 2304, B28B 2178
Patent
active
042737400
ABSTRACT:
A process and apparatus are disclosed for production casting of railroad ties and the like to obtain maximum mold utility. The casting is accomplished by arranging tendons within a mold and subjecting them to an appropriate tensile stress. Uncured concrete is then introduced at a temperature of around 80.degree. C.-90.degree. C. The mold is vibrated and subsequently closed. It is then maintained at 60.degree. C.-80.degree. C. for a time sufficient to cure the concrete such that the prestressing mechanism can be released. The mold may then be immediately re-used. One mechanism by which the molds may be closed during the curing process in most efficient manner is to employ succeeding molds in a stacked arrangement to cover each preceding mold cavity. A single piece conical locking member is also employed to anchor the tendon in the mold.
REFERENCES:
patent: 3999913 (1976-12-01), Branitzky
patent: 4051216 (1977-09-01), Bratchell
patent: 4067939 (1978-01-01), Love
Cement Chemistry & Physics for Civil Engineers, Czernin, Crosby Lockwood & Son, Ltd., London, 1962, pp. 54-55.
Fachin Gino
Marchesi Sergio
Pavelko Thomas P.
Vianini, S.p.A.
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