Concrete slab dowel system and method for making same
First Claim
1. A concrete dowel slab joint system, comprising:
- a dowel bar 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 sleeve assembly for receiving and maintaining the 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 having an outer surface and an inner surface, and defining a hollow interior compartment(b) at least one closed end, and;
(c) at least one generally v-shaped collapsible spacer member located within the hollow interior compartment, said V-shaped spacer member including a pair of outwardly angularly extending side sections having a pair of free ends and joined together at the other end of the side sections to form a base, the base of the V-shaped spacer member being attached to an inner surface of the closed end, and the pair of free ends being joined to the inner surface of the elongate sleeve body, one of the ends of the dowel bar engaging an inner surface of the outwardly angularly extending side sections thereby defining the expansion area between the dowel bar and the elongate sleeve body each collapsible spacer member engaging and positioning the dowel bar at a lateral distance from the inner surface of the elongate sleeve body and at a longitudinal distance from the closed end, said lateral distance and said longitudinal distance together defining an expansion area between the dowel bar and the sleeve assembly, each spacer member being collapsible by interactive forces exerted by the dowel bar moving in a lateral and/or longitudinal path within the hollow interior compartment in response to the expansion and contraction of the concrete.
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Abstract
A concrete dowel slab joint system 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. It includes a sleeve assembly for receiving and maintaining the dowel bar therewithin. In this is way, the dowel bar does not transmit substantial shear stresses to the concrete during the contraction and expansion of the concrete. The sleeve assembly comprises an elongate sleeve body having an outer surface and an inner surface, and defining a hollow interior compartment, (b) at least one closed end, and (c) at least one collapsible spacer member located within the hollow interior compartment. The collapsible spacer member engages and positions the dowel bar at a lateral distance from the inner surface of the elongate sleeve body and at a longitudinal distance from the closed end. These lateral and longitudinal distances together define an expansion area between the dowel bar and the sleeve assembly. The spacer member is collapsible by interactive forces exerted by the dowel bar moving in a lateral and/or longitudinal path within the hollow interior compartment in response to the expansion and contraction of the concrete.
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Citations
18 Claims
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1. A concrete dowel slab joint system, comprising:
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a dowel bar 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 sleeve assembly for receiving and maintaining the 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 having an outer surface and an inner surface, and defining a hollow interior compartment (b) at least one closed end, and; (c) at least one generally v-shaped collapsible spacer member located within the hollow interior compartment, said V-shaped spacer member including a pair of outwardly angularly extending side sections having a pair of free ends and joined together at the other end of the side sections to form a base, the base of the V-shaped spacer member being attached to an inner surface of the closed end, and the pair of free ends being joined to the inner surface of the elongate sleeve body, one of the ends of the dowel bar engaging an inner surface of the outwardly angularly extending side sections thereby defining the expansion area between the dowel bar and the elongate sleeve body each collapsible spacer member engaging and positioning the dowel bar at a lateral distance from the inner surface of the elongate sleeve body and at a longitudinal distance from the closed end, said lateral distance and said longitudinal distance together defining an expansion area between the dowel bar and the sleeve assembly, each spacer member being collapsible by interactive forces exerted by the dowel bar moving in a lateral and/or longitudinal path within the hollow interior compartment in response to the expansion and contraction of the concrete. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A sleeve assembly which receives and maintains a dowel bar 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:
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(a) an elongate sleeve body having an outer surface and an inner surface, and defining a hollow interior compartment, (b) at least one closed end, and (c) at least one generally v-shaped collapsible spacer member located within the hollow interior compartment, said V-shaded spacer member including a pair of outwardly angularly extending side sections having a pair of free ends and joined together at the other end of the side sections to form a base, the base of the V-shaped spacer member being attached to an inner surface of the closed end, and the pair of free ends being joined to the inner surface of the elongate sleeve body, one of the ends of the dowel bar engaging an inner surface of the outwardly angularly extending side sections thereby defining the expansion area between the dowel bar and the elongate sleeve body each collapsible spacer member engaging and positioning the dowel bar at a lateral distance from the inner surface of the elongate sleeve body and at a longitudinal distance from the closed end, said lateral distance and said longitudinal distance together defining an expansion area between the dowel bar and the sleeve assembly, the spacer member being collapsible by interactive forces exerted by the dowel bar moving in a lateral and/or longitudinal path within the hollow interior compartment in response to the expansion and contraction of the concrete.
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10. A concrete dowel slab joint system, comprising:
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a dowel bar 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 sleeve assembly comprising a plurality of interlocking sleeve body sections connected one to the other to form a unitary sleeve body structure for receiving and maintaining the 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 having an outer surface and an inner surface, and defining a hollow interior compartment, (b) at least one closed end, and (c) at least one collapsible spacer member located within the hollow interior compartment, the collapsible spacer members engaging and positioning the dowel bar at a lateral distance from the inner surface of the elongate sleeve body and at a longitudinal distance from the closed end, said lateral distance and said longitudinal distance together defining an expansion area between the dowel bar and the sleeve assembly, the spacer member being collapsible by interactive forces exerted by the dowel bar moving in a lateral and/or longitudinal path within the hollow interior compartment in response to the expansion and contraction of the concrete. - View Dependent Claims (11)
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12. A method for maintaining adjacent sections of concrete in alignment using a dowel bar 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:
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providing a sleeve assembly for receiving and maintaining the 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 having an outer surface and an inner surface, and defining a hollow interior compartment, (b) at least one closed end, and (c) generally v-shaped collapsible spacer members located within the hollow interior compartment said V-shaped spacer member including a pair of outwardly angularly extending side sections having a pair of free ends and joined together at the other end of the side sections to form a base, the base of the V-shaped spacer member being attached to an inner surface of the closed end, and the pair of free ends being joined to the inner surface of the elongate sleeve body, one of the ends of the dowel bar engaging an inner surface of the outwardly angularly extending side sections thereby defining the expansion area between the dowel bar and the elongate sleeve body; introducing the dowel bar into the hollow interior compartment; positioning the dowel bar so that it engages the collapsible spacer members, without collapsing same, at a lateral distance from the inner surface of the elongate sleeve body and at a longitudinal distance from the closed end, said lateral distance and said longitudinal distance together defining an expansion area between the dowel bar and the sleeve assembly; and collapsing the spacer members by moving the dowel bar in a lateral and/or longitudinal path within the hollow interior compartment in response to the expansion and contraction of the concrete by exerting interactive forces on said dowel bar thereby preventing the dowel bar from transmitting substantial shear stresses to the concrete during contraction and expansion of the concrete. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification