GB2282159A

GB2282159A - Wall tie for joining to existing vertical surface

Info

Publication number: GB2282159A
Application number: GB9319604A
Authority: GB
Inventors: Ronald Charles Sammons
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-09-22
Filing date: 1993-09-22
Publication date: 1995-03-29
Anticipated expiration: 2013-09-22
Also published as: GB2282159B; GB9319604D0

Abstract

A masonry or wall tie comprises a pair of spaced substantially rectangular leaves 1, 2 adapted to rest on the surface of a masonry course, a perpendicular flange section 3 adapted to abut an existing vertical surface, and a bridging section having a substantially right angle bend 5 joining the leaves to the flange. The flange has a length and width which correspond with the dimensions of the space 7 between the leaves. The flange also carries a vertical slot 8 which permits the passage of a fixing device into the existing vertical surface. The tie is preferably fabricated from a corrosion resistant metal such as galvanised steel or stainless steel. Preferably the leaves carry small flanges, ribs or indentations (eg. 9, 10) and the bend in the bridging section includes ribs 6 to increase rigidity. The thickness of the metal strip used to fabricate the tie lies in the range 0.5 to 5 mm, preferably 0.9 mm. <IMAGE>

Description

MASONRY TIE This invention relates to a masonry ties, particularly to ties for linking new courses of masonry to existing masonry structures.

A number of tie systems for securing new walls to existing walls have been proposed. In GB-A-2 161 515 a metal anchor plate is attached to an existing wall. Links are attached to the plate as a new wall is built and also embedded in the mortar between courses. GB-A-2 234 763 shows an improved tie system of this nature in which the links fit into slots allowing either wall to move in a vertical plane without distorting or buckling the anchor plate.

GB-2 210 395 shows a simple tie having a fastener in the form of a screw which is embedded, with the aid of a plug, in a hole drilled into an existing wall. The tie carries a pair of flat fingers which can be used to rotate the screw manually and, when the screw is fully embedded, is incorporated in a layer of mortar between courses of masonry in the new wall. This tie has the disadvantage that it must be correctly positioned and fixed before the new wall is laid as the underlying course would otherwise prevent rotation of the screw.

A tie has been proposed which may be laid on a course of masonry of a wall under construction and attached to the original wall by a nail. The tie has two fingers which lie on the upper surface of a course of masonry. The fingers are attached by a flat cross piece in a vertical plane which is arranged to abut the existing wall. The cross piece is pierced with a small aperture which allows the passage of a fixing, such as a screw or nail, to be driven into the existing wall. Such ties cannot accomodate relative movement between the two walls.

The present invention provides a wall tie that can be economically constructed, has high strength, is easily fitted and permits relative movement between the masonry structures to which it is attached.

According to the present invention there is provided a wall tie comprising a pair of spaced substantially rectangular leaves adapted to rest on the surface of a masonry course, a perpendicular flange section adapted to abut an existing vertical surface, and a bridging section having a substantially right angle bend joining the leaves to the flange, characterised in that the flange has a length and width which corresponds with the dimensions of the space between the leaves and in that the flange carries a vertical slot which permits the passage of a fixing device into the existing vertical surface.

The design of the tie allows it to be stamped from metal strip with minimum wastage. The flange punched from a strip having the width of the tie provides the leaves for the following tie to be punched from the strip. Furthermore the tie may easily be fixed to an existing wall without critical measurement. The flange of the tie can be rapidly fitted into a hole in an aerated block by a few hammer blows on a screwbolt or similar fixing. Bolts of this nature are described in GB-A-2 252 381. If the course to which it is to be attached is formed from harder material, such as high density concrete, then the flange must be attached using a hole with a lining plug. No special tools are required to fit the tie and a succession of ties may be fitted as desired as further courses of a new wall are laid.

The ties are preferably made of corrosion resistant metal to ensure adequate strength and long life. Preferred materials are galvanised steel and stainless steel. The leaves- may carry small flanges, ribs or indentations to assist their inclusion in the mortar layer. The bend in the bridging section ma include ribs to increase rigidity.

The thickness of the metal strip used to fabricate the tie lies in the range 0.5 to 5 mm, preferably 0.9 mm.

In order that the invention may be clearly understood it will now be described with reference to the accompanying drawings in which: Figure 1 is a view of a tie according to the invention, Figure 2 is a plan view of the tie shown in Figure 1 before folding, Figure 3 is a side view f the tie shown in Figure 1j and Figure 4 is a cross-section of a new wall adjoining an old wall using tie fixings according to the invention.

A tie according to the invention, see Figure 1, consists of a pair of spaced leaves 1 and 2 attached to a perpendicular flange section 3 through a bridging section 4. The section 4 includes a substantially right angle bend 5 strengthened by ribs 6. The flange 3 has a length and width which corresponds substantially with the dimensions of the space 7 between the leaves 1 and 2. The flange 3 carries a vertical slot 8 to permit the passage of a fixing device. The leaves 1 and 2 include mortar locking folds 9 and the lower part of the bridging section 4 carries a strengthening rib 10.

As will be seen more clearly from Figure 2, the width of the flange 3 is the same as the spacing between the leaves 1 and 2 and the length of the flange 3 is the same as that of the leaves 1 and 2. It will be seen that by punching the tie from metal strip having the same width there will be no wastage as the metal punched out between the leaves 1 and 2 becomes the. flange 3 of the next tie.

In use, see Figure 4, a tie according to the invention 20 is placed so that its leaves 21 lie flat on the upper surface 22 of a course of bricks 23. The flange 24 is placed in contact with the vertical face of an existing wall 25 formed from blocks 26. A screw or other fixing 27 is driven through the slot in the flange 24 so that it holds the flange 24 against the surface of the wall 25.

Mortar is then placed over the leaves 21 together with the rest of the surface of the course 23 so that a further course of bricks may be laid. An earlier laid tie 28 is shown two courses below already embedded in mortar 29 ensuring that the new wall is firmly attached to the old wall.

Claims

1. A wall tie comprising a pair of spaced substantially rectangular leaves adapted to rest on the surface of a masonry course, a perpendicular flange section adapted to abut an existing vertical surface, and a bridging section having a substantially right angle bend joining the leaves to the flange, characterised in that the flange has a length and width which corresponds with the dimensions of the space between the leaves and in that the flange carries a vertical slot which permits the passage of a fixing device into the existing vertical surface.

2. The wall tie as claimed in claim 1, characterised in that the tie is fabricated from a corrosion resistant metal.

3. The wall tie as claimed in claim 2, characterised in that the tie is fabricated from galvanised steel.

4. The wall tie as claimed in claim 2, characterised in that the tie is fabricated from stainless steel.

5. The wall tie as claimed in any of the preceding claims, characterised in that the leaves carry small flanges, ribs or indentations.

6. The wall tie as claimed in any of the preceding claims, characterised in that the bend in the bridging section includes ribs to increase rigidity.

7. The wall tie as claimed in any of the preceding claims, characterised in that the thickness of the metal strip used to fabricate the tie lies in the range 0.5 to 5 mm.

8. The wall tie as claimed in claim 7, characterised in that the thickness of the metal strip used to fabricate the tie is 0.9 mm.

9. Wall ties as claimed in claim 1 and as herein described.

10 Wall ties as herein described with reference to, and as shown in, the accompanying drawings.