GB2134169A

GB2134169A - Wall tie for stabilising cavity walls

Info

Publication number: GB2134169A
Application number: GB08401076A
Authority: GB
Inventors: Peter Alec Prigge
Original assignee: Individual
Current assignee: Individual
Priority date: 1983-01-26
Filing date: 1984-01-14
Publication date: 1984-08-08
Also published as: GB8401076D0

Abstract

A wall tie (10) includes a short shank (12) and a pipe (14) which sheaths a long shank (16). The short shank (12) has spiral formations (18) along its length and is of greater diameter than the long shank (16). The edge (20) which forms the zone of connection between the shanks (12, 16) also forms the contact face for the pipe (14). The wall tie (10) may be installed for remedial or repair work in existing walls. <IMAGE>

Description

SPECIFICATION Wall tie This invention relates to a wall tie and in particular to a tie suitable for remedial use on existing walls.

Various types of wall ties are known in the prior art these generally comprising elements which are incorporated in two adjacent walls during building. Remedial wall ties of the type comprising a shank having a uniform diameter are also known in the prior art. A disadvantage of this arrangement is that the installation procedure is cumbersome.

It is an object of the invention to provide a wall tie which mitigates at least some of the disadvantages of the prior art.

According to the invention there is provided a wall tie including a shank having a first zone locatable in an orifice in one wall, a second zone adapted to be sheathed by a tubular element and locatable in an orifice in another wall, and a formation separating the zones and adapted to provide a contact face for the tubular element.

In a preferred form of the invention the first zone of the shank has a greater diameter than the second zone and the contact face is constituted by the boundary between these zones.

Preferably the tubular element comprises a tube having an internal bore of diameter which is greater than the diameter of the second zone so that the tube may be slidably locatable thereon.

The tube is preferably of a length greater than the length of the second zone of the shank. The tubular element in another form may be of oval or rectangular section to facilitate orientation of the second zone relative to the orifice in the wall. The tubular element in this form of the invention may be adapted to engage the second zone of the shank to facilitate location of the wall tie, mixing of any adhesive in the bore of the wall and firm anchorage in the bore or to engage screw threads on the shank.

The first zone preferably comprises a rod of uniform diameter and which may include a spiral, helical thread or the like formation to facilitate anchorage in a wall. The second zone preferably comprises a rod of substantially lesser diameter than the first zone and includes formations to facilitate anchorage. The contact face is preferably constituted by the edge of the first zone adjoining the second zone.

The wall tie is preferably manufactured from a material which is resistant to corrosion.

An embodiment of the invention is described by way of example with reference to the accompanying drawings in which: Figure 1 is a side view of a wall tie according to the invention; Figure 2 is a schematic section of two walls showing the wall tie of Figure 1 being installed; and Figure 3 is a schemical section of two walls showing the wall tie of Figure 1 after installation.

Referring to the drawings a wall tie 10 includes a short shank 12 and a pipe 14 which sheaths a long shank 1 6.

The short shank 12 has spiral formations 1 8 along its entire length to facilitate anchorage in a bore. The long shank 1 6 is connected to the short shank 12 at an edge 20 which also forms the contact face for the pipe 14. The long shank 1 6 has an undulating profile and is sheathed by the pipe 14 which is of slightly greater length.

In use of the invention a through bore 22 is drilled in the near leaf 24 while blind bore 26 is drilled in the remote leaf 28. The diameter of the bore 26 is slightly less then the diameter of the short shank 12 hence location thereof is effected by applying repeated blows on the edge of the pipe 14 which by virtue of contact with the edge 20 drives the shank 12 into the remote leaf 28.

Thus in the Figure 2 position the shank 12 is firmly located in the remote leaf 28 by frictional engagement. An adhesive may be used to reinforce the anchorage. Alternatively the edge 20 forming the contact face may include formations which are complemental to formations on the leading edge of the tube 14 to enable anchorage of the short shank 12 by rotation for engagement of the screw threads on the shank 12. The shank 12 may in yet another form of the invention be anchored in the bore 26 merely by application of an adhesive or a grout.

The tube 14 is then withdrawn and a grout or adhesive 30 is filled into the bore 22 and allowed to set.

An advantage of the invention is that remedial work on existing walls may be carried out without demolishing any existing structures. Furthermore anchorage is provided for the two leaves of the wall to accommodate differential expansion and hence unequal movement of the walls. The area of the shank between the wall leaves may include means for checking water creep and hence arrest dampening of the interior wall leaf. A socket or gripping element may be provided to engage the longshank for rotatably orientating the wall tie by means of a drilling machine or the like. The gripping element may be arranged to engage an end of the tie a short distance into the bore formed in the wall.

Claims

1. A wall tie including a shank having a first zone locatable in an orifice in one wall, a second zone adapted to be sheathed by a tubular element and locatable in an orifice in another wall, and a formation separating the zones and adapted to provide a contact face for the tubular element.

2. A wall tie according to claim 1 in which the first zone of the shank has a greater diameter than the second zone and the contact face is constituted by the boundary between the zones.

3. A wall tie according to claim 1 or claim 2 in which the tubular element comprises a tube having an internal bore of diameter which is greater than the diameter of the second zone.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Wall tie This invention relates to a wall tie and in particular to a tie suitable for remedial use on existing walls. Various types of wall ties are known in the prior art these generally comprising elements which are incorporated in two adjacent walls during building. Remedial wall ties of the type comprising a shank having a uniform diameter are also known in the prior art. A disadvantage of this arrangement is that the installation procedure is cumbersome. It is an object of the invention to provide a wall tie which mitigates at least some of the disadvantages of the prior art. According to the invention there is provided a wall tie including a shank having a first zone locatable in an orifice in one wall, a second zone adapted to be sheathed by a tubular element and locatable in an orifice in another wall, and a formation separating the zones and adapted to provide a contact face for the tubular element. In a preferred form of the invention the first zone of the shank has a greater diameter than the second zone and the contact face is constituted by the boundary between these zones. Preferably the tubular element comprises a tube having an internal bore of diameter which is greater than the diameter of the second zone so that the tube may be slidably locatable thereon. The tube is preferably of a length greater than the length of the second zone of the shank. The tubular element in another form may be of oval or rectangular section to facilitate orientation of the second zone relative to the orifice in the wall. The tubular element in this form of the invention may be adapted to engage the second zone of the shank to facilitate location of the wall tie, mixing of any adhesive in the bore of the wall and firm anchorage in the bore or to engage screw threads on the shank. The first zone preferably comprises a rod of uniform diameter and which may include a spiral, helical thread or the like formation to facilitate anchorage in a wall. The second zone preferably comprises a rod of substantially lesser diameter than the first zone and includes formations to facilitate anchorage. The contact face is preferably constituted by the edge of the first zone adjoining the second zone. The wall tie is preferably manufactured from a material which is resistant to corrosion. An embodiment of the invention is described by way of example with reference to the accompanying drawings in which: Figure 1 is a side view of a wall tie according to the invention; Figure 2 is a schematic section of two walls showing the wall tie of Figure 1 being installed; and Figure 3 is a schemical section of two walls showing the wall tie of Figure 1 after installation. Referring to the drawings a wall tie 10 includes a short shank 12 and a pipe 14 which sheaths a long shank 1 6. The short shank 12 has spiral formations 1 8 along its entire length to facilitate anchorage in a bore. The long shank 1 6 is connected to the short shank 12 at an edge 20 which also forms the contact face for the pipe 14. The long shank 1 6 has an undulating profile and is sheathed by the pipe 14 which is of slightly greater length. In use of the invention a through bore 22 is drilled in the near leaf 24 while blind bore 26 is drilled in the remote leaf 28. The diameter of the bore 26 is slightly less then the diameter of the short shank 12 hence location thereof is effected by applying repeated blows on the edge of the pipe 14 which by virtue of contact with the edge 20 drives the shank 12 into the remote leaf 28. Thus in the Figure 2 position the shank 12 is firmly located in the remote leaf 28 by frictional engagement. An adhesive may be used to reinforce the anchorage. Alternatively the edge 20 forming the contact face may include formations which are complemental to formations on the leading edge of the tube 14 to enable anchorage of the short shank 12 by rotation for engagement of the screw threads on the shank 12. The shank 12 may in yet another form of the invention be anchored in the bore 26 merely by application of an adhesive or a grout. The tube 14 is then withdrawn and a grout or adhesive 30 is filled into the bore 22 and allowed to set. An advantage of the invention is that remedial work on existing walls may be carried out without demolishing any existing structures. Furthermore anchorage is provided for the two leaves of the wall to accommodate differential expansion and hence unequal movement of the walls. The area of the shank between the wall leaves may include means for checking water creep and hence arrest dampening of the interior wall leaf. A socket or gripping element may be provided to engage the longshank for rotatably orientating the wall tie by means of a drilling machine or the like. The gripping element may be arranged to engage an end of the tie a short distance into the bore formed in the wall. Claims

4. A wall tie according to claim 3 in which the length of the tube is greater than the length of the second zone.

5. A wall tie according to any one of claims 1 to 4 in which the first zone comprises a rod having a spiral, helical or other thread like formation, formed along the length.

6. A wall tie according to claim 5 in which the second zone comprise a rod of lesser diameter and greater length than the first zone.

7. A wall tie according to claim 6 in which the contact face is constituted by the edge of the first zone adjacent the edge of the second zone.

8. A wall tie according to any one of claims 1 to 7 which includes means to arrest water creep between adjacent walls in which the tie may be incorporated.

9. A wall tie substantially as herein described with reference to any one of Figures 1 to 3 of the accompanying drawings.

1 0. A method of installing a wall tie substantially as herein described with reference to any one of Figures 1 to 3 of the accompanying drawings.