Lifting and leveling insert for a precast concrete slab
AssigneeMeadow Burke, LLC
InventorMichael J. Recker
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.
Claims20
An apparatus for lifting and leveling a precast concrete slab, comprising:
- a sleeve configured to be embedded in said precast concrete slab, the sleeve having a predetermined length, an upper thread extending along an inner surface of said sleeve by a distance that is shorter than said predetermined length, and a lower thread extending along said inner surface of said sleeve by a distance that is shorter than said predetermined length;
- a lifting bolt positioned in said upper thread of said sleeve;
- a leveling bolt positioned in said lower thread of said sleeve, said leveling bolt having a length that is shorter than said predetermined length of said sleeve;
- and
- a plate positioned on 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 is selectively rotated in said lower thread, which selectively elevates or lowers said precast concrete slab above a ground surface.
A method of embedding a lifting and leveling insert in a precast concrete slab, comprising:
- providing an insert having:
- a sleeve with an upper threaded portion and a lower threaded portion on an inner surface of said sleeve, wherein said upper threaded portion has a larger diameter than said lower threaded portion;
- a plate operably positioned on a lower end of said sleeve;
- a plurality of legs extending from an outer surface of said sleeve;
- and
- pouring concrete around said sleeve of said insert in a concrete form to create a precast concrete slab, wherein said plate is operably positioned at a lower surface of said concrete slab to selectively detach from said lower surface of said concrete slab.
A method of transporting and setting a precast concrete slab with an insert, comprising:
- providing an insert in a precast concrete slab, wherein said insert has a sleeve with an upper threaded portion and a lower threaded portion on an inner surface of said sleeve, wherein said upper threaded portion has a larger diameter than said lower threaded portion, and wherein said insert comprises a plate that is selectively detachable from said sleeve and a lower surface of said precast concrete slab;
- engaging a lifting bolt in said upper threaded portion of said sleeve;
- lifting said precast concrete slab with said lifting bolt into a position on a ground surface;
- removing said lifting bolt from said upper threaded portion;
- and
- engaging a leveling bolt in said lower threaded portion of said sleeve such that said plate of said insert detaches from said sleeve and said lower surface of said precast concrete slab and raises said precast concrete slab above said ground surface to a predetermined elevation.
Dependencies are inferred from the claim text.