Apparatus for pre-stressing concrete structural member
OwnerAbraham Beharinventor
Life of this patent
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Abstract
The disclosure is of apparatus, and the positioning and adjustment thereof within a form in which a pre-tensioned pre-stressed concrete structural member is to be cast, for holding a tensioned strand extending through the concrete against movement after release of the tensioning force, thereby to prevent the formation in the cast body of the weakened zone known as the "development length."
Claims5
A pre-tensioned, pre-stressed, pre-cast concrete structural member comprising a body of cast concrete having at least one surface, a plate in surface-to-surface engagement with the surface, a tensioned steel extending through the plate and into the body, and means within the body connected to the plate and operable to resist transverse expansion of the steel and movement of the steel longitudinally into the concrete body, said means comprising wedge means at least partially surrounding and engaging the steel, and means for adjustably connecting the wedge means to the plate.
Dependencies are inferred from the claim text.