Apparatus for producing a concrete product prestressed in at least two directions
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United States of America Patent
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-
Jan 12, 1988
Grant Date -
N/A
app pub date -
Nov 27, 1985
filing date -
Apr 2, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of and a casting bed for producing a concrete product, especially an endless concrete blank prestressed in at least two directions. In order to enable a prestressing wire to be arranged in position and tightened in a simpler manner, at least one prestressing wire is passed in a zigzag-like manner crosswise between at least two fixed sides of a casting bed to form a wire net and the wire net is tightened from a third side of the casting bed in the direction of both first-mentioned sides so that the wire net is stretched in two directions by means of a traction in one direction. Finally, concrete is fed on the bed to form a prestressed concrete blank. An apparatus intended for carrying out the method comprises a weaving device for stretching the prestressing wires continuously and in a zigzag-like manner crosswise between two parallel sides of the casting bed and for tightening of the wires in the longitudinal direction of the casting bed.
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