System and method for splicing precast pre-stressed concrete piles
OwnerHenry Whitty, Sr.inventor
Life of this patent
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Abstract
A system and method for splicing precast pre-stressed concrete piles and bringing pre-stress forces to each end of the piles with splice plates and with sockets cast in the splice plates to receive pre stressing strands, strand wedges to engage the strands in the sockets and transfer the pre stress forces to the ends of the piles after re-stressing, with alignment pins, alignment sockets and connecting channels to join splice plates.
Claims6
A system for splicing precast pre-stressed concrete piles while maintaining the normal pre-stress strand spacing, size and configuration, comprising a plurality of precast pre-stressed concrete piles, each with a pile upper end having a pile upper end slice plate, and a pile lower end having a pile lower end splice plate interchangeable with the pile upper end splice plate and at least one pre-stressing strand having a strand lower end and an strand upper end, each strand end coated with a bond breaker for a length sufficient to prevent bonding between the strand and concrete in the pile to assure that there is sufficient movement in the strand to be fully engaged by strand chuck wedges, running longitudinally from the pile lower end to the pile upper end, a strand socket at the pile upper end splice plate and pile lower end splice plate each located to receive respectively the strand upper end and the strand lower end, each of said strand sockets having a socket end and hole embedded in the respective pile upper end and pile lower end and the socket terminating and opening at a pile upper or lower end splice plate, the strand lower end and the strand upper end each having a protruding end extending through their respective socket ends and holes, each strand protruding end extending through their respective socket ends and holes in a pre-stressed condition and engaged by strand chuck wedges after re-stressing by post tensioning jack.
A method for splicing precast pre-stressed concrete piles while maintaining the normal pre-stress strand spacing, size and configuration of a typical un-spliced concrete pile, comprising a plurality of precast pre-stressed concrete piles, each with a pile upper end having a pile upper end slice plate, and a pile lower end having a pile lower end splice plate interchangeable with the pile upper end splice plate and at least one pre-stressing strand having a strand lower end and an strand upper end, each strand end coated with a bond breaker for a length sufficient to prevent bonding between the strand and concrete in the pile to assure that there is sufficient movement in the strand to be fully engaged by strand chuck wedges, running longitudinally from the pile lower end to the pile upper end, comprising the steps of:
- casting a strand socket at the pile upper end splice plate and pile lower end splice plate each located to receive respectively the strand upper end and the strand lower end, each of said strand sockets having a socket end and hole embedded in the respective pile upper end and pile lower end and the socket terminating and opening at a pile upper or lower end splice plate, the strand lower end and the strand upper end each having a protruding end extending through their respective socket ends and holes;
- re-stressing and engaging each strand protruding end extending through their respective socket ends and holes in a pre-stressed condition by a strand chuck wedge to carry pre-tension forces to the respective ends of the pile.
Dependencies are inferred from the claim text.