GB2060805A - Wall anchor - Google Patents

Abstract

A wall anchor consists of a rod which is threaded at one end to receive a nut and carries a transversely extending bar at its other end, which bar is less than 10 mm thick measured transversely of the rod. The anchor is intended for connecting the inner wall of an existing cavity wall to an adjacent structural member such as a floor joist. A hole is first drilled through both the outer and inner walls, on a bedding joint of the outer wall, and a slot is made in the outer wall by removing mortar of that bedding joint. The anchor is then passed through the slot, threaded end first, and brought to a position where its threaded end projects through and beyond the inner wall for connection to the floor joist. Once the bar has passed completely through the slot the anchor is rotated automatically by the bar, which has arms of unequal lengths, to bring the bar to a vertical position. The outer wall can then be made good with mortar.

Description

SPECIFICATION Wall tie This invention relates to a wall tie for securing a structural member, such as a floor joist, to the inner wall of a.cavity wall, and to a method of incorporating the tie in the cavity wall.

According to the invention a wall tie comprises a rod which is threaded at one end to receive a nut, the other end of the rod carrying a transversely extending elongate bar of width, in the direction transverse to the axis of the bolt, less than substantially 1 Omm.

Such a wall tie is particularly suitable for use with a cavity wall in which the outer wall at least is a brick and mortar wall, and can be assembled in its position of use with a minimum disturbance to the outer wall and such that its presence is not readily detectable by viewing the outer wall.

The wall tie is conveniently inserted to its position of use by drilling a hole transversely through both the outer and inner walls of a diameter to receive the rod, on a bed joint of the outer wall, removing the mortar of the bed joint of the outer wall for a sufficient length to produce a slot to allow passage of the bar, and then inserting the tie through the hole and slot from the exterior of the outer wall, threaded end first so that the threaded end of the rod passes through the inner wall to project therefrom, and then making good with mortar the slot and hole in the outer wall. The threaded end of the rod is then secured by a nut to a suitable structural member, such as a floor joist extending parallel to but spaced from the inner wall, and on tightening of the nut the bar is clamped firmly against the inner wall.

Preferably the bar is dimensioned such that its centre of gravity is offset from the axis of the rod so that the rod is automatically rotated through substantially 90 by the weight of the bar once the bar has passed through the slot, the bar assuming a substantially vertical position.

The bar is preferably of a length such that it engages with a plurality of coarses of bricks of the inner wall when the inner wall is also a brick wall.

A preferred construction of tie comprises a steel rod of length 675mm and minimum diameter 20 mm with a transverse slot cut in one end to receive a steel bar of dimensions 350 X 25 X 8mm. The bar is secured to the rod by a fillit weld and such that the two arms of the bar extending in opposite directions from the bolt are 300mm and 1 50mm in length, and the other end of the bar is threaded.

1. A wall tie for securing a structural member to the inner wall of a cavity wall, the tie comprising a rod which is threaded at one end to receive a nut, the other end of the rod carrying a transversely extending elongate bar of width, in the direction transverse to the axis of the bolt, less than substantially 10 mm.

2. A wall tie as claimed in claim 1 in which the bar is dimensioned such that the centre of gravity of the bar is offset from the axis of the rod.

3. A wall tie as claimed in claim 2 in which the two arms of the bar extending in opposite directions from the bolt have lengths substantially in the ratio of 2 to 1.

4. A wall tie as claimed in any of the preceding claims in which the bar is welded in a transverse slot in said other end of the rod.

5. A wall tie substantially as hereinbefore described.

6. A method of securing a structural member to the inner wall of a cavity wall using a wall tie in accordance with any of the preceding claims, comprising forming a hole which extends transversely through both the outer and inner walls of the cavity wall of a diameter to receive the rod, on a bed joint of the outer wall, removing the mortar of the bed joint of the outer wall for a sufficient length to produce a slot to allow passage of the bar, and then inserting the tie through the hole and slot from the exterior of the wall, threaded end first, so that the threaded end of the rod passes through the inner wall to project therefrom, turning or allowing the rod to turn so that the bar extends substantially transversely of the bedding joints of the inner wall, making good the slot and hole in the outer wall, and attaching a nut to the threaded end of the tie to secure the threaded end to the structural member.

7. A method as claimed in claim 6 and substantially as hereinbefore described.

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

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Wall tie This invention relates to a wall tie for securing a structural member, such as a floor joist, to the inner wall of a.cavity wall, and to a method of incorporating the tie in the cavity wall. According to the invention a wall tie comprises a rod which is threaded at one end to receive a nut, the other end of the rod carrying a transversely extending elongate bar of width, in the direction transverse to the axis of the bolt, less than substantially 1 Omm. Such a wall tie is particularly suitable for use with a cavity wall in which the outer wall at least is a brick and mortar wall, and can be assembled in its position of use with a minimum disturbance to the outer wall and such that its presence is not readily detectable by viewing the outer wall. The wall tie is conveniently inserted to its position of use by drilling a hole transversely through both the outer and inner walls of a diameter to receive the rod, on a bed joint of the outer wall, removing the mortar of the bed joint of the outer wall for a sufficient length to produce a slot to allow passage of the bar, and then inserting the tie through the hole and slot from the exterior of the outer wall, threaded end first so that the threaded end of the rod passes through the inner wall to project therefrom, and then making good with mortar the slot and hole in the outer wall. The threaded end of the rod is then secured by a nut to a suitable structural member, such as a floor joist extending parallel to but spaced from the inner wall, and on tightening of the nut the bar is clamped firmly against the inner wall. Preferably the bar is dimensioned such that its centre of gravity is offset from the axis of the rod so that the rod is automatically rotated through substantially 90 by the weight of the bar once the bar has passed through the slot, the bar assuming a substantially vertical position. The bar is preferably of a length such that it engages with a plurality of coarses of bricks of the inner wall when the inner wall is also a brick wall. A preferred construction of tie comprises a steel rod of length 675mm and minimum diameter 20 mm with a transverse slot cut in one end to receive a steel bar of dimensions 350 X 25 X 8mm. The bar is secured to the rod by a fillit weld and such that the two arms of the bar extending in opposite directions from the bolt are 300mm and 1 50mm in length, and the other end of the bar is threaded. CLAIMS

1. A wall tie for securing a structural member to the inner wall of a cavity wall, the tie comprising a rod which is threaded at one end to receive a nut, the other end of the rod carrying a transversely extending elongate bar of width, in the direction transverse to the axis of the bolt, less than substantially 10 mm.

2. A wall tie as claimed in claim 1 in which the bar is dimensioned such that the centre of gravity of the bar is offset from the axis of the rod.

3. A wall tie as claimed in claim 2 in which the two arms of the bar extending in opposite directions from the bolt have lengths substantially in the ratio of 2 to 1.

4. A wall tie as claimed in any of the preceding claims in which the bar is welded in a transverse slot in said other end of the rod.

5. A wall tie substantially as hereinbefore described.

6. A method of securing a structural member to the inner wall of a cavity wall using a wall tie in accordance with any of the preceding claims, comprising forming a hole which extends transversely through both the outer and inner walls of the cavity wall of a diameter to receive the rod, on a bed joint of the outer wall, removing the mortar of the bed joint of the outer wall for a sufficient length to produce a slot to allow passage of the bar, and then inserting the tie through the hole and slot from the exterior of the wall, threaded end first, so that the threaded end of the rod passes through the inner wall to project therefrom, turning or allowing the rod to turn so that the bar extends substantially transversely of the bedding joints of the inner wall, making good the slot and hole in the outer wall, and attaching a nut to the threaded end of the tie to secure the threaded end to the structural member.

7. A method as claimed in claim 6 and substantially as hereinbefore described.