Crack control for concrete
AssigneeEngineered Devices Corporation
InventorReginald D. Hough
Life of this patent
Estimating the term…
Abstract
A crack inducer controls propagation of cracks in set concrete containing reinforcing bars. The crack inducer has an elongated, rigid core that is relatively narrow in a direction that is parallel to outer surfaces of the concrete. The core has a core width in a first plane that intersects the outer surfaces of the volume, that is at least 20% of the concrete volume width so that a crack in the volume of concrete is induced to propagate from the core and along the first plane. A plurality of spaced cross-plates are connected to the core and a water-stop may be included around part of the core.
Claims20
A crack inducer arrangement for controlling propagation of cracks in a volume of set concrete having opposite outer vertical surfaces and a plurality of reinforcing bars arranged within the volume and between the outer surfaces of the volume, the arrangement comprising:
- an elongated, rigid and vertical core member adapted to extend in the volume at a location spaced inwardly of the opposite outer surfaces of the volume, the core member having a plate portion lying in a first plane that is adapted to intersect at least one of the outer surfaces of the volume, a crack in the volume of concrete being induced to propagate from the plate portion and in the first plane;
- and
- a relatively resilient water-stop member extending at least partly around the plate portion on a side of the plate portion that faced one of the outer surfaces, the water-stop member including a solid portion extending beyond the plate portion and having a tapered edge spaced from the plate portion, the water-stop member including a pair of side portions connected to the solid portion and extending at opposite sides of the plate portion, and at least one projection extending at least party over the flange portion of the core member, the projection contributing to a clotting of calcium effervescence from the concrete volume near the water-stop member to avoid calcium effervescence from reaching a crack induced by the plate portion, the projection including a wing portion having an outer edge and an enlargement along the outer edge of the wing portion for trapping the clotting calcium effervescence adjacent the plate portion and away from the outer surfaces of the concrete.
A crack inducer arrangement for controlling propagation of cracks in a volume of set concrete having opposite vertical outer surfaces and a plurality of reinforcing bars arranged within the volume and between the outer surfaces of the volume, the volume having a volume width between the outer surfaces, the arrangement comprising:
- an elongated, rigid core that is relatively narrow in a direction that is parallel to the outer surfaces and perpendicular to the elongation direction of the core, the core being adapted to extend in the volume at a location spaced inwardly of the opposite outer surfaces of the volume, the core having a core width in a first plane that intersects the outer surfaces of the volume, the core width being at least 20% of the volume width so that a crack in the volume of concrete is induced to propagate from the core and along the first plane;
- and a plurality of spaced cross-plates connected to at least parts of the core and adapted to be located within the volume of concrete.
A crack inducer arrangement for controlling propagation of cracks in a volume of set concrete having opposite outer surfaces and a plurality of reinforcing bars arranged within the volume and between the outer surfaces of the volume, the arrangement comprising:
- an elongated, rigid core that is relatively narrow in a direction that is parallel to the outer surfaces, the core being adapted to extend in the volume at a location spaced inwardly of the opposite outer surfaces of the volume for inducing a crack in the volume of concrete to propagate from the core and along the first plane;
- and
- a plurality of spaced cross-plates connected to at least parts of the core and adapted to be located within the volume of concrete;
- the core comprising an elongated, rigid and hollow polygonal core member of sheet metal adapted to extend in the volume at a location spaced inwardly of the opposite outer surfaces of the volume, the core member having outer flanges and the spaced cross-plates being connected to the core outer flanges.
Dependencies are inferred from the claim text.