AU2006101064A4

AU2006101064A4 - Plate dowel sleeve

Info

Publication number: AU2006101064A4
Application number: AU2006101064A
Authority: AU
Inventors: Mark Anthony Connolly; John Mercer
Original assignee: Connolly Key Joint Pty Ltd
Current assignee: Connolly Key Joint Pty Ltd
Priority date: 2006-12-18
Filing date: 2006-12-18
Publication date: 2007-02-01
Anticipated expiration: 2014-12-18
Also published as: AU2006101064B4

Description

P/00/012 Regulation 3.2

AUSTRALIA

Patents Act 1990

ORIGINAL

COMPLETE SPECIFICATION INNOVATION PATENT Invention Title: "PLATE DOWEL SLEEVE" The following statement is a full description of this invention, including the best method of performing it known to us: 1 TITLE: PLATE DOWEL SLEEVE BACKGROUND OF THE INVENTION 1. Field of the Invention THIS INVENTION relates to a plate dowel sleeve.

The invention is particularly suitable for, but not limited to, a plate dowel sleeve incorporated in a plate dowel system for use in transferring a load across a joint between first and second cast-in-place concrete slabs where the plate dowel sleeve is embedded within the first slab and receives a plate dowel is embedded in, and extending from, the second slab.

2. Prior Art Over the years, many dowel systems have been proposed to transfer loads between, and accurately locate, first and second cast-in-place concrete slabs across joints. Typically, the dowels have been circular, square or rectangular in cross-section and have been slidably received within complementary dowel sleeves embedded in the other of the slabs at spaced locations along the joint between the adjacent slabs.

Australian Innovation Patent 2006100394, in the name of Connolly Key Joint Pty Ltd, entitled "PLATE DOWEL SYSTEM FOR CONCRETE SLABS" discloses a plate dowel system which can be substituted for the conventional circular, square or rectangular dowels and their complementary sleeves or sheathes.

A major advantage of the plate dowel system of AU 2006100394 is that each plate dowel can transfer much greater loads N 2

O

Sbetween the first and second slabs; and so the number of dowels/sleeves 0 can be reduced, with the dowel/sleeves being placed at much greater centre 00 spacings along the joint between the first and second slabs.

SUMMARY OF THE INVENTION It is a preferred object of the present invention to provide a Splate dowel sleeve where the location of the sleeve, relative to the formwork Ifor the slab in which the sleeve will be embedded, can be more accurately located.

It is another preferred object of the present invention to provide a simple method of mounting the dowel plate sleeve on the formwork, which will ensure that the dowel plate sleeve remains embedded in the slab, after the slab has been poured and set, when the formwork is removed.

It is another preferred object of the present invention to provide a plate dowel sleeve where at least one movable internal reinforcing member protects the sleeve against collapse due to the hydrostatic pressures on the sleeve generated by the slab while allowing the dowel plate to be selectively inserted into the sleeve.

Other preferred objects of the present invention will become apparent from the following description.

In one aspect, the present invention resides in a plate dowel sleeve having a substantially rectangular cavity defined by top and bottom walls interconnected by a pair of side walls, a rear wall and a frontal opening, the frontal opening being surrounded by a peripheral flange wherein: at least one flange extends rearwardly of the peripheral flange ID 3 N and has a hole therethrough; and 0 a respective duplex nail is received in the hole to mount the 00 peripheral flange to adjacent formwork for the casting of a concrete slab in which the plate dowel sleeve is to be embedded, and where an end portion of the or each duplex nail is adapted to be embedded in the concrete slab to 0 prevent the plate dowel sleeve from being stripped from the concrete slab Iwhen the formwork is removed.

In a second aspect, the present invention resides in a plate dowel sleeve having a cavity defined by top and bottom walls interconnected by a pair of side walls, a rear wall and a frontal opening, the frontal opening being surrounded by a peripheral flange wherein: cuts or deformations are provided substantially at the mid point of each side edge of the peripheral flange to enable the peripheral flange to be located against fixing marks applied to the formwork to which the plate dowel sleeve is to be fixed.

In a third aspect, the present invention resides in a plate dowel sleeve having a cavity defined by top and bottom walls interconnected by a pair of side walls, a rear wall and a frontal opening, the frontal opening being surrounded by a peripheral flange wherein: at least one internal reinforcing member is received within the cavity and engages the top and bottom walls to prevent collapse of the sleeve when embedded in concrete in a first slab, whilst being movable within the cavity to enable variable insertion of a dowel plate in a second slab into the cavity across a joint between the first and second slabs.

N 4 Preferably, the or each internal reinforcing member comprises an elongate strip of plastics material, preferably of substantially I-shape, 0_ where flanges, interconnected by a web, respectively engage inner faces of the top and bottom walls.

In a fourth aspect, the present invention resides in a plate dowel sleeve having a combination of the features of any two or more of the plate dowel sleeves of the first to third aspects.

BRIEF DESCRIPTION OF THE DRAWINGS To enable the invention to be fully understood, a preferred embodiment will now be described with reference to the accompanying drawings, in which: FIG. 1 is a front elevational view of the plate dowel sleeve in accordance with the present invention; FIG. 2 is a top plan view; FIG. 3 is a rear elevational view; FIG. 4 is a side elevational view (parts being omitted for clarity); FIG. 5 is a sectional side view taken on line 5-5 on FIG. 3; and FIG. 6 shows a portion of the plate dowel sleeve of FIG. 5 on an enlarged scale.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The plate dowel sleeve 10 of the present invention is suitable for use in the plate dowel system disclosed in AU-2006100394 (Connolly Key Joint Pty Ltd), the contents of which are incorporated in the present specification by reference.

IO c- The plate dowel sleeve 10 has a cavity 11 defined by a top wall a,12, a bottom wall 12, side walls 14, 15, a rear wall 16 and a front opening 17 00oO surrounded by a peripheral flange 40, to be hereinafter described in more detail.

Two pairs of opposed fins 18, 19 are provided within the cavity 11, spaced a small distance from the adjacent side walls 14, 15 to guide a IDdowel plate 90 towards a central position within the cavity 11; whilst allowing Slimited lateral movement of the dowel plate 90 relative to the cavity 11 if the respective slabs across a joint undergo limited lateral movement.

Pairs of mounting pins 20, provided on the rear wall 16, can releasably support fixing screws used to mount the peripheral flange 40 to the formwork (not shown) for the slab (not shown) in which the dowel plate sleeve 10 is to be embedded.

A pair of flanges 22-23 extend from the side walls 14, 15 and have enlarged lugs 24, 25 with co-axial holes 26-27 arranged to receive the shanks 31 of respective duplex nails 30 where each duplex nail 30 has a head 32 and a peripheral flange 33 spaced along the shank 31 from the head 32.

Slots or notches 41, 42 are provided centrally in the top and bottom edges of the peripheral flange 40, while similar slots or notches 43, 44 are provided at the end edges.

The slots or notches 41 to 44 enable the peripheral flange 40 to be accurately aligned against location marks on the face of the formwork (not shown) to which the plate dowel sleeve 10 is to be mounted.

N 6 When the formwork is of metal, the peripheral flange 40 may Sbe secured thereto by the screws 21.

00 However, where the formwork is timber, it is preferred to use the duplex nails 30 which are driven through the holes 26, 27 until the D 5 flanges 33 engage the ends of the lugs 24, 25. This results in a portion of the shank 31 and the head 32 of each duplex nail 30 being embedded in the \concrete when the slab, in which the plate dowel sleeve 10 is to be c' embedded, is poured.

When the formwork is stripped from the slab after the concrete slab has set, the embedding of the heads 32 of the duplex nails 30 causes the duplex nails 30 to be released from the timber formwork and thereby prevent the plate dowel sleeve 10 from being stripped free from the concrete slab.

A movable internal reinforcing strip 50, shown in more detail in FIGS. 5 and 6, which may be extruded from suitable plastics material (which may incorporate reinforcing fibres) is of substantially I-shape where the respective flanges 51, 52, interconnected by a web 53, engage the inner faces of the adjacent top and bottom walls 12, 13.

When the concrete is poured around the plate dowel sleeve the internal reinforcing strip 50 provides support for the top and bottom walls 12, 13 against any internal collapse due to the hydrostatic pressures generated within the surrounding concrete.

Initially, the internal reinforcing strip 50 is provided in the cavity 11 adjacent the front opening 17.

N 7 As the dowel plate 90, of the second slab at the joint, is Sinserted into the cavity 11, it pushes the internal reinforcing strip 50 towards 00 the rear wall 16 of the cavity 11, the movement of the internal reinforcing strip 50 allowing variable insertion of the dowel plate 90 within the cavity 11.

(The dowel plate 90 will assist in supporting the top and bottom walls 12, 13 0against collapse under the hydrostatic pressures within the surrounding concrete.) The features hereinbefore described enable a plate dowel sleeve to be efficiently and accurately mounted on the formwork for a slab before the slab is poured; will resist any hydrostatic forces within the concrete, in which it is embedded, from collapsing the sleeve; will enable variable insertion of the dowel plate within the cavity 11 of the dowel plate sleeve 10; and will prevent the dowel plate sleeve 10 from being stripped from the concrete slab when the formwork is removed.

Various changes and modifications may be made to the embodiments described and illustrated without departing from the present invention.

Claims

2. A plate dowel sleeve having a cavity defined by top and bottom walls interconnected by a pair of side walls, a rear wall and a frontal opening, the frontal opening being surrounded by a peripheral flange wherein: cuts or deformations are provided substantially at the mid point of each side edge of the peripheral flange to enable the peripheral flange to be located against fixing marks applied to the formwork to which the plate dowel sleeve is to be fixed.
3. A plate dowel sleeve having a cavity defined by top and bottom walls interconnected by a pair of side walls, a rear wall and a frontal opening, the frontal opening being surrounded by a peripheral flange wherein: at least one internal reinforcing member is received within the NO 9 N cavity and engages the top and bottom walls to prevent collapse of the U a sleeve when embedded in concrete in a first slab, whilst being movable 00oO within the cavity to enable variable insertion of a dowel plate in a second slab into the cavity across a joint between the first and second slabs.
4. A sleeve as claimed in Claim 3, wherein: the or each internal reinforcing member comprises an elongate \strip of plastics material, optionally of substantially I-shape, where flanges, Sinterconnected by a web respectively engage inner surfaces of the top and bottom walls.
5. A plate dowel sleeve incorporating the features of any two or more of Claims 1, 2 and 3. DATED this eighteenth day of December 2006. CONNOLLY KEY JOINT PTY LTD By its Patent Attorneys FISHER ADAMS KELLY