Wire wall tie

Abstract

 A wire wall tie (5), consisting of a wire element (10) having one outer end provided with a hook (6) bent through approximately 90° and having the other outer end provided with a wavy profile (8) extending over a certain length of the wire element (10), which wavy profile (8) is provided in a plane (R) intersecting the plane (XY) through the wire element (10) and the hook (6) at an angle of approximately 30°-60°, preferably approximately 45°.

Description

[0001] The invention relates to a wire wall tie, consisting of a wire element having one outer end provided with a hook bent through approximately 90° and having the other outer end provided with a wavy profile extending over a certain length of the wire element.

[0002] Such wall ties have been used for many years, in particular with cavity walls having insulating material provided therebetween. Such a cavity wall is put up in three stages, being: (see Fig. 1)

1. Masoning the inner wall 1, for instance from sandlime blocks. At spread points, wall ties 5 are pressed into the wet mortar 4, the hooks 6 of which should produce sufficient adhesive power to hold the wall tie 5 in position and to prevent it from tilting away.

2. Insulating material 2 is slid over the wall ties 5 projecting from the inner wall 1. The insulating layer 2 is then secured against the inner wall 1 by means of insulation clamping rings 7.

3. Masoning up the outer wall 3, and securing the freely projecting, wavy outer ends 8 of the wall ties 5 therein.

[0003] If the wavy profile 8 is surrounded by the mortar of the joints in the outer wall 3 on all sides, a high pull value is obtained.

[0004] Because the joints of the outer wall 3 are only rarely at the same level as the joints of the inner wall 1, the freely projecting wavy profiles 8 of the wall ties 5 are bent in upward or downward direction on a facing brick when the outer wall 3 is masoned up. Accordingly, the face of the wavy profile 8 will rest on the top face of a facing brick and, after mortar has been applied, the wavy profile 8 is surrounded by that mortar to an insufficient extent. This has a highly adverse effect on the pull value of the wall tie.

[0005] The object of the invention is to overcome this drawback and to that end, the invention provides a wall tie wherein the wavy profile is provided in a plane which intersects the plane through the wire element and the hook at an angle of approximately 30°-60°.

[0006] The optimum value for the cutting angle is approximately 45°.

[0007] An embodiment of the wall tie according to the invention will be specified with reference to the accompanying drawings, wherein:

Fig. 1 shows a cavity wall in construction, as discussed hereinabove;

Fig. 2 shows the wall tie according to the invention; and

Fig. 3 shows a wall tie according to Fig. 2 in bricked-in condition.

[0008] Fig. 2 shows an orthogonal coordinate system XYZ, wherein the wall tie 5 according to the invention is drawn in. The wire element 10 of the wall tie 5 extends according to the X-axis, and the outer end 6, bent so as to be hook-shaped, extends according to the Y-axis. The free outer end of the wire element 10 is over a certain length provided with a wavy profile 8 whose waves lie in a plane R intersecting the Y-Y'-axis at an angle of 45°. The center-to-center distance of the waves of the wavy profile 8 is 12-25 mm, while the wave height is approximately 6 mm. The waves of the wavy profile 8 do not lie on two sides of the center line of the wire element 10, but project from this wire element 10 on one side only, as a result of which the tangent line 11 - shown in dotted lines - at the bottom crests of the waves of the wavy profile 8 coincides with a surface line of the wire element 10. In Fig. 2, the hook 6 and the wavy profile 8 lie on two sides of the plane XZ. Of course, the hook 6 can also be oriented according to the Y'-axis, in which case the hook 6 and the wavy profile 8 are located on the same side of the plane XZ.

[0009] The length of the wavy profile 8 is chosen so that in bricked-in condition (see Fig. 3), a part 9 of the wavy profile 8 projects from the outer wall 3 in the cavity space. This has the advantage that the wavy profile 8 also serves as a water barrier, as indicated by the falling drop 12. Accordingly, in this case, no so-called water spout needs to be provided in the wall tie, as is conventional with other types of wire wall ties. As Fig. 3 demonstrates, in bricked-in condition, the wavy profile 8 is surrounded by the mortar 4 to a sufficient extent, so that the pull value of the wall tie 5 remains sufficiently great, even though the bottom crests of the wavy profile 8 lie on the top face of a brick of the outer wall. With the known wall ties, the wavy profile would fully rest on the top face of such a brick.

Claims

1. A wire wall tie, consisting of a wire element having one outer end provided with a hook bent through approximately 90° and having the other outer end provided with a wavy profile extending over a certain length of the wire element,
characterized in that
the wavy profile (8) is provided in a plane (R) intersecting the plane (XY) through the wire element (10) and the hook (6) at an angle of approximately 30°-60°.

2. A wire wall tie according to claim 1, characterized in that
the cutting angle is approximately 45°.

3. A wire wall tie according to claims 1-2, characterized in that
the wavy profile (8) projects from the wire element (10) on one side only.

Drawing