Concrete slab dowel system and method for making and using same

• US 20060177268A1
• Filed: 07/22/2005
• Published: 08/10/2006
• Est. Priority Date: 02/10/2005
• Status: Active Grant

• Current Assignee: Donald R. Kramer
• Original Assignee: Donald R. Kramer
• Inventors: Kramer, Donald R.
• Granted Patent: US 7,441,984 B2
• Time in Patent Office: Days
• US Class Current: 404/47
• CPC Class Codes: E01C 11/14 Dowel assembly ; Design or construction of reinforcements in the area of joints coupling devices for prefabricated units E01C5/005; combined with characteristic packings E01C11/08 - E01C11/12; removable holders E01C23/045

Abstract

A plurality of sleeve members for receiving and maintaining a dowel bar therewithin can be provided so that the dowel bar does not transmit substantial shear stresses to the concrete during the contraction and expansion of the concrete. The sleeve members can comprise (a) at least one hollow interior compartment for receiving and supporting said dowel bar, and (b) at least one aperture for receiving a bracket member. The dowel bar can have a tapered configuration and a pair of end sections. The dowel bar can be located within the hollow interior compartment for maintaining adjacent sections of concrete in alignment during contraction and expansion of the concrete, and for transferring shear stresses and bending moments across a joint formed between adjacent concrete slabs. The dowel bar can move in a lateral and/or longitudinal path within the hollow interior compartment and exerting interactive forces in response to the expansion and contraction of the concrete. A plurality of bracket members located on an underlying surface can support the sleeve members and the dowel bar above the underlying surface.

Claims

1. A concrete dowel slab joint system, comprising:

a plurality of sleeve members for receiving and maintaining a dowel bar therewithin so that the dowel bar does not transmit substantial shear stresses to the concrete during the contraction and expansion of the concrete, the sleeve members comprising (a) at least one hollow interior compartment for receiving and supporting said dowel bar, and (b) at least one aperture for receiving a bracket member;

said dowel bar having a tapered configuration and a pair of end sections, said dowel bar being located within said hollow interior compartment for maintaining adjacent sections of concrete in alignment during contraction and expansion of the concrete, and for transferring shear stresses and bending moments across a joint formed between adjacent concrete slabs, the dowel bar moving in a lateral and/or longitudinal path within the hollow interior compartment and exerting interactive forces in response to the expansion and contraction of the concrete, the tapered configuration of said dowel bar providing supplemental structural support for the dowel bar which is sufficient to overcome the effect caused if concrete joint separation skews the original position of the dowel bar; and

a plurality of bracket members located on an underlying surface for supporting said sleeve members and said dowel bar above said underlying surface, each said bracket member comprising at least one connection element which is engagingly insertable into each said aperture, each said bracket member and sleeve member being movable with respect to each other when shrinkage of the concrete occurs.

2. The concrete dowel slab joint system of claim 1, wherein the dowel bar comprises an upper outer surface, a lower outer surface and a pair of side outer surfaces, and at least one of said pair of side outer surfaces comprises a tapered configuration which gradually narrows toward each said end section of the dowel bar.

3. The concrete dowel slab joint system of claim 2, wherein said pair of side outer surfaces comprise a tapered configuration which gradually narrow toward each said end section of the dowel bar.

4. The concrete dowel slab joint system of claim 1, wherein each said bracket member includes a stanchion joined to said connection element and located on said underlying surface for supporting each said sleeve member and said dowel bar, respectively.

5. The concrete dowel slab joint system of claim 1, wherein the bracket member comprises a support framework.

6. The concrete dowel slab joint system of claim 2, wherein the slope of the tapered configuration extends from substantially the middle portion of the dowel bar and gradually narrows toward each of the end sections.

7. The concrete dowel slab joint system of claim 1, wherein said sleeve member is fabricated of a polymeric material and/or said bracket member is fabricated of a polymeric material or a metal material and/or said dowel bar is fabricated of a metal material or a polymeric material.

8. The concrete dowel slab joint system of claim 1, wherein each said bracket member supports a sleeve a dowel bar at a plurality of locations with respect to said underlying surface.

9. The concrete dowel slab joint system of claim 1, wherein each bracket member comprises a plurality of connection elements.

10. The concrete dowel slab joint system of claim 1, wherein said support member defines a plurality of apertures for receiving a bracket member at a plurality of locations for adjusting the height of the dowel bar to a plurality of locations with respect to the underlying surface.

22. The concrete dowel slab joint system of claim 1, wherein at least one connection element, and the aperture into which the connection element is engagingly inserted, have a cross-sectional configuration which is not circular in shape so that the connection element will substantially prevented from rotating within said aperture.

25. The concrete dowel slab joint system of claim 1, wherein each said sleeve member defines an opening in communication with said hollow interior compartment for venting air into the atmosphere surrounding said sleeve assembly when the dowel bar is introduced into said hollow interior compartment.

11. A concrete dowel slab joint system, which comprises

a plurality of sleeve members for receiving and maintaining the dowel bar therewithin so that a dowel bar does not transmit substantial shear stresses to the concrete during the contraction and expansion of the concrete, the sleeve members defining (a) at least one hollow interior compartment for receiving and supporting a dowel bar, and (b) at least one aperture for receiving a bracket member, each said bracket member and each sleeve member being movable with respect to each other when shrinkage of the concrete occurs, said bracket member being located on an underlying surface for supporting said sleeve assembly system above said underlying surface;

and

said dowel bar being located within said hollow interior compartment for maintaining adjacent sections of concrete in alignment during contraction and expansion of the concrete, and for transferring shear stresses and bending moments across a joint formed between adjacent concrete slabs, the dowel bar moving in a lateral and/or longitudinal path within the hollow interior compartment and exerting interactive forces in response to the expansion and contraction of the concrete, said dowel bar being capable of movement to a position which is substantially non-parallel with respect to an original position of the dowel bar when the concrete dowel slab joint system was originally installed.

23. The concrete dowel slab joint system of claim 11, wherein at least one connection element, and the aperture into which the connection element is engagingly inserted, have a cross-sectional configuration which is not circular in shape so that the connection element will substantially prevented from rotating within said aperture.

26. The concrete dowel slab joint system of claim 11, wherein each said sleeve member defines an opening in communication with said hollow interior compartment for venting air into the atmosphere surrounding said sleeve assembly when the dowel bar is introduced into said hollow interior compartment.

12. A method for maintaining adjacent sections of concrete in alignment during contraction and expansion of the concrete and for transferring shear stresses and bending moments across a joint formed between adjacent concrete slabs, which comprises:

providing sleeve members for receiving and maintaining the dowel bar therewithin so that a dowel bar does not transmit substantial shear stresses to the concrete during the contraction and expansion of the concrete, the sleeve members comprising (a) at least one hollow interior compartment, and (b) at least one aperture for receiving a bracket member;

providing a dowel bar;

locating the dowel bar within said hollow interior compartment for maintaining adjacent sections of concrete in alignment during contraction and expansion of the concrete, and for transferring shear stresses and bending moments across a joint formed between adjacent concrete slabs, the dowel bar moving in a lateral and/or longitudinal path within the hollow interior compartment and exerting interactive forces in response to the expansion and contraction of the concrete so as not to transmit substantial shear stresses to the concrete during the contraction and expansion of the concrete, said dowel bar being capable of movement to a position which is substantially non-parallel with respect to an original position of the dowel bar when the concrete dowel slab joint system was originally installed;

providing a plurality of bracket members;

locating each said bracket member on an underlying surface, each bracket member comprising at least one connection element; and

engagingly inserting each said connection element into each said aperture for supporting said sleeve assembly and dowel bar above said underlying surface, each said bracket member and sleeve assembly being movable with respect to each other when shrinkage of the concrete occurs.

13. The method of claim 12, wherein the dowel bar comprises an upper outer surface, a lower outer surface and a pair of side outer surfaces, and at least one of said pair of side outer surfaces comprise a tapered configuration which gradually narrows toward each end section of the elongate sleeve body.

14. The method of claim 12, wherein said pair of side outer surfaces comprises a tapered configuration which gradually narrows toward each end section of the elongate sleeve body.

15. The method of claim 12, wherein said bracket member includes a stanchion joined to said connection element and located on said underlying surface for supporting each said sleeve member and said dowel bar. .

16. The method of claim 12, wherein the bracket member comprises a support framework.

17. The method of claim 12, wherein the sleeve member and/or bracket member and/or dowel bar are fabricated from a metal material or a polymeric material.

18. The method of claim 12, wherein each bracket member supports a dowel bar at a plurality of locations with respect to the underlying surface.

19. The method of claim 12, wherein each bracket member comprises a plurality of connection elements.

20. The method of claim 12, wherein said support member defines a plurality of apertures for receiving a bracket member at a plurality of locations for adjusting the height of the dowel bar to a plurality of locations with respect to the underlying surface.

24. The method of claim 12, wherein at least one connection element, and the aperture into which the connection element is engagingly inserted, have a cross-sectional configuration which is not circular in shape so that the connection element will substantially prevented from rotating within said aperture.

27. The method of claim 12, wherein each said sleeve member defines an opening in communication with said hollow interior compartment for venting air into the atmosphere surrounding said sleeve assembly when the dowel bar is introduced into said hollow interior compartment.

21. A concrete slab including a plurality of concrete dowel slab joint systems, each concrete dowel slab joint system comprising

a plurality of sleeve members for receiving and maintaining a dowel bar therewithin so that the dowel bar does not transmit substantial shear stresses to the concrete during the contraction and expansion of the concrete, the sleeve members comprising (a) at least one hollow interior compartment for receiving and supporting said dowel bar, and (b) at least one aperture for receiving a bracket member;

said dowel bar having a tapered configuration and a pair of end sections, said dowel bar being located within said hollow interior compartment for maintaining adjacent sections of concrete in alignment during contraction and expansion of the concrete, and for transferring shear stresses and bending moments across a joint formed between adjacent concrete slabs, the dowel bar moving in a lateral and/or longitudinal path within the hollow interior compartment and exerting interactive forces in response to the expansion and contraction of the concrete, the tapered configuration of said dowel bar providing supplemental structural support for the dowel bar which is sufficient to overcome the effect caused if concrete joint separation skews the original position of the dowel bar; and

a plurality of bracket member located on an underlying surface for supporting said sleeve members and said dowel bar above said underlying surface, each said bracket member comprising at least one connection element which is engagingly insertable into each said aperture, each said bracket member and sleeve member being movable with respect to each other when shrinkage of the concrete occurs.