Lifting and leveling insert for a precast concrete slab
AssigneeMeadow Burke, LLC
InventorsMichael Recker, Ronald G. Naumann, Hector G. Ruiz
Life of this patent
Estimating the term…
Abstract
An insert for lifting and leveling a precast concrete slab is provided. The insert includes a sleeve that extends through the concrete slab and has two distinct threaded portions on an inner surface of the sleeve. This configuration allows a lifting bolt to be positioned into an upper end of the sleeve to lift the concrete slab, and a different-sized leveling bolt to be positioned in the sleeve to selectively elevate or raise part of the concrete slab relative to a ground surface.
Claims17
An insert for lifting and leveling a precast concrete slab, comprising:
- a sleeve configured to be embedded in a precast concrete slab, the sleeve having a predetermined total length;
- an upper thread extending along an inner surface of said sleeve by a distance that is shorter than said predetermined total length;
- a lifting bolt positionable in said upper thread for hoisting and positioning said precast concrete slab, said lifting bolt having an outer diameter;
- a lower thread extending along said inner surface of said sleeve by a distance that is shorter than said predetermined total length;
- a leveling bolt positionable in said lower thread and is shorter than said predetermined total length of said sleeve, said leveling bolt having an outer diameter that is smaller than said outer diameter of said lifting bolt;
- and
- a plate selectively interconnected to a lower end of said sleeve, wherein said plate is configured to extend away from said lower end of said sleeve as said leveling bolt rotates in said lower thread.
A method for manufacturing a first insert for lifting and leveling a precast concrete slab, comprising:
- turning a continuous wire about a longitudinal axis to produce a lower portion of a first sleeve for a first insert, said lower portion having an inner diameter configured to receive a leveling bolt;
- turning said continuous wire about said longitudinal axis to produce a transition portion from said lower portion to an upper portion of said first sleeve;
- turning said continuous wire about said longitudinal axis to produce said upper portion, said upper portion having an inner diameter configured to receive a lifting bolt, wherein said inner diameter of said lower portion is smaller than said inner diameter of said upper portion;
- cutting said continuous wire after producing said upper portion;
- and
- selectively engaging a plate to said lower portion, wherein said plate is configured to disengage from said lower portion as said leveling bolt rotates through said lower portion and pushes said plate.
A precast concrete panel with an apparatus for lifting and leveling the precast concrete panel, comprising:
- a precast concrete panel having an upper surface, a lower surface, and perimeter edges extending therebetween;
- a sleeve configured to be embedded in said precast concrete panel, said sleeve having a predetermined total length, and said sleeve made from a continuous wire;
- an upper portion of said sleeve having an inner diameter configured to receive a lifting bolt to position said precast concrete panel, wherein an opening of said upper portion is positioned proximate to said upper surface of said precast concrete panel;
- and
- a lower portion of said sleeve having an inner diameter configured to receive a leveling bolt, said inner diameter of said lower portion is smaller than said inner diameter of said upper portion, wherein an opening of said lower portion is positioned proximate to said lower surface of said precast concrete panel.
Dependencies are inferred from the claim text.