Apparatus for controlling density profile in a concrete extruded

Details Apparatus for controlling density profile in a concrete extruded Apparatus for controlling density profile in a concrete extruded

1991-02-11

1993-08-24

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Building forms or construction engineering type mold with...

Including mold charging means

264 70, 425262, 425432, B28B 1700

Patent

active

052383741

ABSTRACT:
In the extrusion of hollow core concrete slabs, the density profile across the slab is controlled by the vibration of a hammering plate forming one side of a packing chamber through which the concrete is extruded. Vibrations are imparted to the hammering plate by a vibrator that acts to produce vibratory motions in the plate that are not parallel to the direction of extrusion. With two vibrators producing vibratory components both in the direction of extrusion and outwardly to opposite sides of the packing chamber, the flow of concrete to the side edges of the slab is augmented. In an auger-type extruder, this allows the outer augers to be run at a slower speed than otherwise, thus increasing their service life. The vibratory frequency may also be reduced considerably, thus reducing the noise generated by operation of the apparatus.

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