Process and apparatus for manufacturing single piece...

Details Process and apparatus for manufacturing single piece... Process and apparatus for manufacturing single piece...

B - Operations, Transporting

28

B

25/114, 25/116

B28B 21/60 (2006.01) B28B 21/78 (2006.01)

Patent

CA 1114587

ABSTRACT A process and apparatus are disclosed for produc- tion 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°C - 90°C. The mold is vibrated and subsequently closed. It is then maintained at 60°C - 80°C for a time sufficient to cure the concrete such that the prestressing mechnism 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 a 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.

301150

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