AU599758B2

AU599758B2 - A device and method for tying cavity walls

Info

Publication number: AU599758B2
Application number: AU12732/88A
Authority: AU
Inventors: Alan George Logan
Original assignee: ITW Construction Systems Australia Pty Ltd
Current assignee: ITW Construction Systems Australia Pty Ltd
Priority date: 1987-03-06
Filing date: 1987-03-06
Publication date: 1990-07-26
Anticipated expiration: 2008-03-04
Also published as: AU1273288A

Description

i l-I rr~ I i: pl-l~--X-lllll~ruI^llill~l^--_l~ l_ -l L~ 59 8 COMMONWEALTH OF AUST I PATENTS ACT 1952 COMPLETE SPECIFICATION (Original) This document contains the FOR OFFICE USE amlerduients made under S,-:ion 49 and is correct for printing.

Class Int. Class Application Number: Lodged: Complete Specification Lodged: a Accepted: O 9 0 Published: Priority: Related Art: o LODGED A: SUB-OFhCE 4 MAR 1988 Melbourne Name of Applicant: RAMSET FASTENERS (AUST.) PTY. LIMITED *0 Address of Applicant: Maroondah Highway, Croydon North, 3136, in the State of Victoria, Commonwealth of Australia Actual Inventor(s): ALAN GEORGE LOGAN Address for Service: DAVIES COLLISON, Patent Attorneys, 1 Little Collins Street, Melbourne, 3000.

Complete specification for the invention entitled: "A DEVICE AND METHOD FOR TYING CAVITY WALLS" The following statement is a full description of this invention, including the best method of performing it known to r- -2- "A DEVICE AND METHOD FOR TYING CAVITY WALLS" 00 0 0 00 00 O0 The present invention relates to a device 0 5 and method for tying cavity walls.

0 0 0 0 S°h When cavity or double walls are constructed 0 the inner and outer walls are spaced apart by approximately 50mm in order to provide a cavity or 00o00 10 air gap therebetween. The provision of the air gap 0 00 :o 0 significantly improves insulation of the dwelling for which the wall is constructed. It is necessary to o°°o strengthen the wall by tying the inner and outer 0 0 walls together with a tie that extends across the air gap at predetermined locations. In the past it was common to include, during construction, a tie made of o000 galvanized wire.

Over a period of time, however, water i rA i

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00 0 o 00 o a a a as S 0O o 0 0000 00 o p 0 o oo o o o o 0 o 0 0 0

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0 0 0 -3accumulates in the cavity of double walls and in those walls employing galvinized wire ties, the water corrodes the ties and the strength of the wall is significantly weakened. Once corroded the galvinized wire ties must be replaced by a remedial tie. A tie known as an expansion anchor is suitable for this purpose. The anchor, which is made of steel, comprises, inter alia, an elongated cone, which is adapted to expand due to the provision of a number of slits extending from the base of the cone, and a tapered rod adapted to be inserted within the cone.

In order to insert the anchor in a cavity wall, a hole is first drilled in the wall, the hole extending into the outer wall and having a diameter smaller than the diameter of the base of the cone. The cone is then inserted in the hole and the rod is forced into the cone so that the cone engages the wall of the hole, thereby fixing the anchor within the hole and between the inner and outer walls.

The expansion anchor, however, places an undesirable stress on the walls and is expensive to manufacture as it comprises a relatively large number of parts.

An object of the present invention is to provide a device which can be used as a remedial tie for cavity walls and which does not have the disadvantages associated with the expansion anchor.

In accordance with the present invention there is provided a device for use as a tie between the opposed wall parts of a cavity wall, said device comprising a tubular member insertable into a hole in

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Y I- 1 LC i-i-uira=a~i 4 each of the wall parts so as to span the cavity, the tubular member having at least one opening positioned in the circumference of the member to communicate with each respective hole, and means for extruding a settable material from the interior of the tubular member through the openings into the holes so as to set the member within the holes.

In accordance with the present invention there is also provided a method of tying an inner and outer wall o o of a cavity wall comprising the steps of: o o. inserting a tubular member, having a circumferential o wall with a plurality of openings, in a hole in said 0. 15 cavity wall, said hole extending into said inner and 00 outer walls, and extruding a portion of settable material disposed in the tubular member through said openings so as to set the tubular member in said hole in said cavity wall.

So A preferred embodiment of the present invention 000. will now be described, by way of example only, with reference to the accompanying drawings wherein: ouo oaoo Figure 1 is a plan view of a rod of a device in accordance with the present invention; 00 Figure 2 is an end view of a rod of Figure 1; o 0 0r Figure 3 is a plan view of a cylindrical member of a device in accordance with the present invention; Figure 4 is a cross-sectional view X-X of the cylindrical member of Figure 3; Figure 5 is an end view of the head of the cylindrical member of Figure 3; Figure 6 is a cross-sectional view Y-Y of shdat.002,12732.1let.4 0" the cylindrical member of Figure 3; Figure 7 is a partial cross-sectional view V-V of the cylindrical member of Figure 3; Figure 8 is a longitudinal cross-sectional view of the cylindrical member of Figure 3; Figure 9 is a partial cross-sectional view of the cylindrical member of Figure 3 inserted in a hole in a cavity wall and having adhesive injected into the member; Figure 10 is a cross-sectional view of the cylindrical member of Figure 3 inserted in a hole in o 0 0 a cavity wall and having adhesive disposed therein, and showing the rod of Figure 1 being inserted into S0: the cylindrical member; Figure 11 is a partial cross-sectional view Soof a device in accordance with the present invention fixed within a hole in a cavity wall.

o 00A device 2 for use as a remedial tie for 0 o20 cavity walls, as shown in Figures 1 to 11, comprises a cylindrical member 4 and a rod 6, which is adapted 0 to be inserted within the cylindrical member 4.

The cylindrical member 4 is adapted to be 0 0a25 inserted in a hole in a cavity wall, i.e. in a hole extending through an inner wall 12 of the cavity wall and an aligned hole 14 in the outer wall 16 of the cavity wall. The cylindrical member 4 includes a first portion 20 which when inserted lies within the hole 14 of the outer wall, a second portion 22 which is adapted to extend across the cavity 18 between the inner and outer walls 12 and 16 and a third portion 24 which when the member 4 is inserted lies within the hole 10 of the inner wall 12. The diameter of i ir- -L-LILLYIYI~; i-I-i. -6the holes 10 and 14 is substantially the same as the outer diameter of the cylindrical member 4.

At the end of the cylindrical member 4 and forming part of the third portion 24, there is provided an enlarged head 26 which is slightly larger in diameter than the holes 10 and 14. The head 26 includes a plurality of grooves 28 which allow the head to contract when it is forced into the hole The head 26 therefores makes contact with the wall of °o the hole 10 and allows the cylindrical member 4 to be o held in a fixed position when inserted in the hole of 0° the cavity wall 0 o0 0 15 In order to tie the inner and outer walls 12 o o and 16, firstly the holes 10 and 14 in the walls 12 and 16 are drilled to form a hole in the double brick 0oo wall and the cylindrical member 4 is positioned within the hole, as shovn in Figures 9 to 11. A two °0 20 part polyester adhesive is then injected into the :o.00 cylindrical member, as shown in Figure 9, by means of a chemical injection gun 30. The mixing nozzle 32 of the gun 30, in which the two part adhesive is mixed, oo00 is inserted into the cylindrical member 4 adjacent the head 26 of the member 4. The adhesive is injected until it substantially fills the inside of the cylindrical member 4.

The cylindrical member 4 includes a plurality of slots or openings 34 in the circumferential wall of the member 4. The slots 34 are included in the first and third portions 20 and 24 of the member 4 so.as to allow the injected adhesive to pass therethrough and make contact with -7the walls of the holes 10 and 14, as shown in Figure 9.

The rod 6, which has a diameter slightly smaller than the inner diameter of the cylindrical member 4, is then inserted into the cylindrical member so as to extrude or force a portion of the adhesive in the member 4 through the slots 34 so as to make contact with the walls of the holes 10 and 14. The cylindrical member 4 preferably has at least 0 0 two rows of slots 34 in the third portion 24 in order 0 to prevent hydraulic lock occuring when the rod is inserted into the member 4.

0 00 15 The outer surface of the first and third portions 20 and 24 of the member 4 is of a thread-like structure and each portion has a helical groove or grooves 40 disposed thereon, as shown in Figure 3 and 7. The helical grooves 40 help transmit the adhesive extruded from the slots 34 so that the adhesive flows from the slots along the outer surface G. o S0 of the portions 20 and 24. This ensures that the adhesive coats the outer surface of the first and third portions 20 and 24 of the member 4 and the 25 walls of the holes 10 and 14.

The first and third portions 20 and 24 of j the cylindrical member 4 include protrusions 42 which are placed between the grooved portions of the first and third portions 20 and 24 and the second portion 22 which extends across the air gap 18. These protrusions 42 ensure that only excess adhesive is allowed to flow into the cavity 18 and that the outer surface of the first and third portions 20 and 24 are satisfactorily coated with adhesive.

-8- The inner diameter of the cylindrical member 4 decreases from the third portion 24 to the first portion 20 so that the member 4 engages the rod when the rod is inserted therein. The rod =*Ahas two portions 50 and 52, having an increased diameter, and being disposed at either end of the rod *Aso as to engage the inside of the cylindrical member 4 at both ends. The rod 6 also includes a head 54 which, when the rod 6 is inserted in the cylindrical member 4, 0° 10 lies adjacent the head 26 of the cylindrical member 4. The head 54 may be used as an anvil when 0 o .o inserting the rod 6. The rod 6 also includes a number of annular grooves -§*Awhich, when the rod 0 inserted in the cylindrical member 4, as shown in 15 Figure 11, are adjacent the helically grooved portions of the cylindrical member 4.

0 o° The rod 6 remains in the cylindrical member 4 once o° inserted and when the adhesive cures, approximately 00 20 eight minutes after injection in the cylindrical member 4, the rod 6 acts as a strength member within the device 2. On curing annular membranes of adhesive form about the annular grooves 56 of the rod 00°4 6 and helical membranes of adhesive form between the outer surface of the groove portions of the member 4 and the walls of the holes 10 and 14. All of the above features enhance the resistance of the device to shear forces exerted by the cavity wall.

The second portion 22 of the cylindrical member 4 includes an annular protrusion 60 which, when the cylindrical member is inserted in the hole in the cavity wall, is positioned in substantially qAL,

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4. A -9the centre of the cavity 18. The annular protrusion prevents water, accumulating on the cylindrical member 4, from being transmitted between the inner and outer walls 12 and 16 and thereby prevents further deterioration of the cavity wall.

Many modifications will be apparent to those skilled in the art without departing from the scope of the present invention as hereinbefore described with reference to the accompanying drawings.

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0 00 0 (.400

Claims

1. A device for use as a tie between the opposed wall parts of a cavity wall, said device comprising a tubular member insertable into a hole in each of the wall parts so as to span the cavity, the tubular member having at least one opening positioned in the circumference of the member to communicate with each respective hole, and means for extruding a settable material from the interior of the tubular member through the openings into the holes 0o o so as to set the member within the holes. S° 2. A device according to Claim 1, wherein the tubular member has at least two such openings positioned to I 1 communicate with each respective hole, the said two openings being spaced axially.

3. A device according to Claim 1, wherein the tubular member has two axially spaced rows of openings positioned o°°0 to communicate with each respective hole, the openings in 0.0 o0. :each row being spaced angularly around the member. A device according to any one of Claims 1 to 3, wherein the or each opening positioned to communicate with each respective hole is located in a zone of the tubular member in which the outer surface of the member is formed with grooves which 3,rshdat.002.12732.et.10 L 4 0 -11- communicate with the or each hole and which are inclined to the axis of the tubular member so as to distribute the extruded material along and around said zone. A device according to claim 4, wherein a portion of the tubular member intermediate the zones and which is adapted to span the cavity has, adjacent the end of each of said zones, means for inhibiting flow of extruded material from the holes and into the cavity. o 6. A device according to claim 4 or claim 04 wherein a portion of the tubular member intermediate u the zones includes a barrier to prevent water transmission between the opposed wall parts.

7. A device according to any one of claims 1 to o0 0 6, wherein the tubular member has, at one end portion, an enlarged head adapted to engage the 0 periphery of the hole in one of said wall parts so as to anchor the tubular member in the wall part.

8. A device according to any one of claims 1 to 7, wherein the means for extruding the settable material comprises a rod-like member insertable into the interior of the tubular member.

9. A device according to claim 4 and claim 8, wherein the rod-like member has portions which are adapted to lie within the grooved zones of the tubular member, said portions of the rod being grooved so as to communicate with the grooved zones via the respective openings. -12- A device according to claim 9, wherein the grooves of the said portions of the rod-like member are annular.

11. A device according to claim 9 or claim wherein the diameter of the grooved portions of the rod-like member are less than the inner diameter of the tubular member, and the rod-like member has, at each end, portions of a diamettr substantially equal to the internal diameter of the tubular member. 0 O r So" 12. A method of tying inner and outer wall parts "o of a cavity wall comprising the steps of: 0 OO 00 0 inserting a tubular member, having a 0 a circumferential wall with a plurality of openings, in aligned holes in inner and outer wall parts, and 0 °o extruding a settable material disposed in the tubular member through said openings so as to set the tubular member in the holes in the inner and outer wall o parts.

13. A device for use as a tie, substantially as hereinbefore described with reference to the accompanying drawings. DATED this 3rd of April, 1990 DAVIES COLLISON, Patent Attorneys for RAMSET FASTENERS (AUST.) PTY. LIMITED I I iIj 5 .gv