Patent ID: 6773650
Filing Date: 2004-08-10
Classification: B28B

Abstract:
A method of casting elongated prestressed concrete products, comprising:positioning a clamshell-type mold form, including two hinged mold halves, onto a first prestressing element pretensioning fixture; closing the mold halves together over a set of prestressing elements pretensioned in the pretensioning fixture, to form a mold cavity with said prestressing elements extending therealong; dispensing concrete slurry into the mold cavity; permitting said concrete slurry to cure, to thereby form a concrete casting; opening the mold halves and removing the mold form from the casting and the pretensioning fixture, after the casting has at partially cured, said casting remaining on said pretensioning fixture, and said pretensioning fixture remaining stationary, during said removing of the mold form; permitting said casting to continue to cure on said pretensioning fixture after removal of the mold form, at least to such point that engagement of the concrete with the pretensioned prestressing elements will prevent movement of the prestressing elements within the concrete; and thereafter releasing said prestressing elements from said pretensioning fixture.