Concrete slab dowel system and method for making and using same

• US 7,201,535 B2
• Filed: 02/10/2005
• Issued: 04/10/2007
• Est. Priority Date: 02/10/2005
• Status: Expired due to Fees

• Current Assignee: Donald R. Kramer
• Original Assignee: Donald R. Kramer
• Inventors: Kramer, Donald R.
• Primary Examiner(s): Hartmann; Gary S
• Application Number:
  US11/056,313
• Publication Number:
  US 20060177269A1
• Time in Patent Office: 789 Days
• Field of Search: 404/52, 404/56, 404/61, 404/62, 404/63.135, 523/960.2
• US Class Current: 404/52
• 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 sleeve assembly system, a concrete dowel slab joint system, 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, and a concrete slab including a plurality of concrete dowel slab joint systems are provided. The concrete dowel slab joint system comprises the sleeve assembly for receiving and maintaining the dowel bar therewithin. The sleeve assembly is designed so that the dowel bar does not transmit substantial shear stresses to the concrete during the contraction and expansion of the concrete. A pair of bracket members, located on an underlying surface, support the sleeve assembly and the dowel bar above the underlying surface.

Claims

1. A concrete dowel slab joint system, comprising:

a sleeve assembly 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 assembly comprising (a) an elongate sleeve body including an outer surface having a tapered configuration and defining a hollow interior compartment, and (b) at least one end section defining an aperture;

the dowel bar 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 elongate sleeve body 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

at least one bracket member located on an underlying surface for supporting said sleeve assembly and said dowel bar above said underlying surface, each bracket member comprising at least one connection element which is engagingly insertable into each said aperture, each said bracket member and sleeve assembly 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 elongate sleeve body 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 said end section of the elongate sleeve body.

3. The concrete dowel slab joint system of claim 2, wherein said pair of side outer surfaces comprises a tapered configuration which gradually narrows toward each said end section of the elongate sleeve body.

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

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 elongate sleeve body and gradually narrows toward each of the end sections.

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

8. The concrete dowel slab joint system of claim 1, wherein each bracket member supports a plurality of sleeve assemblies and dowel bars, respectively.

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 dowel bar is fabricated of a metal material or a polymeric material.

11. 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.

12. The concrete dowel slab joint system of claim 1, wherein each said end section defines a plurality of apertures for adjusting the position of the sleeve member with respect to the bracket member.

13. The concrete dowel slab joint system of claim 12, wherein said plurality of apertures are located at positions so that the height of the dowel bar with respect to the underlying surface can be varied.

14. The concrete dowel slab joint system of claim 1, wherein each said elongate sleeve body 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.

15. A sleeve assembly system which comprises

a sleeve assembly 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 assembly comprising (a) an elongate sleeve body including an outer surface having a tapered configuration and defining a hollow interior compartment, and (b) at least one end section, each said end section defining an aperture for receiving an engagingly insertable connection element of a bracket member, each said bracket member and sleeve assembly 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

a dowel bar 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.

16. The concrete dowel slab joint system of claim 15, 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.

17. The concrete dowel slab joint system of claim 15, wherein each said end section defines a plurality of apertures for adjusting the position of the sleeve member with respect to the bracket member.

18. The concrete dowel slab joint system of claim 17, wherein said plurality of apertures are located at positions so that the height of the dowel bar with respect to the underlying surface can be varied.

19. The concrete dowel slab joint system of claim 15, wherein each said elongate sleeve body 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.

20. 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 a sleeve assembly 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 assembly comprising (a) an elongate sleeve body including an outer surface having a tapered configuration and defining a hollow interior compartment, and (b) at least one end section, each said end section defining an aperture;

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 at least one bracket member;

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.

21. The method of claim 20, wherein wherein the elongate sleeve body 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.

22. The method of claim 20, wherein said pair of side outer surfaces comprises a tapered configuration which gradually narrows toward each end section of the elongate sleeve body.

23. The method of claim 20, wherein said bracket member includes a stanchion joined to said connection element and located on said underlying surface for supporting said sleeve assembly and said dowel bar.

24. The method of claim 20, wherein the bracket member comprises a support framework.

25. The method of claim 20, wherein the elongate sleeve body and/or bracket member is fabricated from a metal material or a polymeric material.

26. The method of claim 20, wherein each bracket member supports a plurality of sleeve assemblies and said dowel bars.

27. The method of claim 20, wherein each bracket member comprises a plurality of connection elements.

28. The method of claim 20, wherein said dowel bar is fabricated of a metal material.

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

a sleeve assembly 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 assembly comprising (a) an elongate sleeve body including an outer surface having a tapered configuration and defining a hollow interior compartment, and (b) at least one end section defining an aperture;

the dowel bar 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, and wherein said dowel bar is 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, and wherein said dowel bar is capable of movement to a position which is substantially non-parallel with the position of a dowel bar in any other concrete dowel slab joint system located within said concrete slab; and

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