B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
25/116, 238/42,
B28B 1/14 (2006.01) B28B 23/00 (2006.01) B28B 23/04 (2006.01)
Patent
CA 1204584
ABSTRACT OF THE DISCLOSURE The present invention provides a process for pre- casting workpieces of prestressed concrete containing pre- fabricated internally threaded screw anchors, comprising the steps of: (a) providing a form of a shape corresponding to that of at least one workpiece with a horizontal nut fixedly secured to the bottom of said form; (b) securing reinforcing armatures under tension to said form above said bottom; (c) removably attaching a prefabricated screw anchor to said form by threading a headed bolt from above through the screw anchor into engagement with said nut, said bolt passing with clearance through the screw anchor without engaging the inter- nal thread thereof; (d) pouring concrete into the form around said armatures and said screw anchor; (e) allowing the poured concrete to harden into a rigid workpiece; (f) detaching said bolt from said nut; (g) disconnecting said armatures from said form to prestress the workpiece; and (h) extracting the workpiece from said form, said bolt being held centered in said insert by a sleeve resting on said bottom, the extrac- tion of the workpiece in step (h) being accomplished with the aid of a lifting implement passed through said screw anchor into engagement with said sleeve. The present invention also provides an apparatus for use in said process.
420713
Bono Giancarlo
Migliacci Antonio
Tognoli Pietro
Industria Prefabbricati Affini I.p.a. S.p.a.
Marks & Clerk
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