A WALL TIE

Abstract: According to the invention, by producing wall ties for use in the building of double walls from a wire (2) with a rough (5, 6) surface, the cohesion with the mortar will be considerably increased for the reason that the whole of the built-in part of the tie constitutes an anchor. The roughness (5) is preferably in the form of projections (6) that extend from the core (2) of the wire, said projections being evenly distributed along the whole surface of the wire. The projections (6) can be placed in several rows which extend in the longitudinal direction of the wire, and these projections can be arranged in an angular manner for achieving the maximum holding power.

Description: A WALL TIE State of the art The invention concerns a wall tie of wire for use in the building of double walls, and where at least the one end of the wire is placed in the mortar layer. The object of wall ties is to ensure the necessary degree of cohesion of the wall, which is a so-called double wall comprising two separate walls which are held together by means of built-in/secured wall ties. The ties are built-in with the distance prescribed for the relevant brickwork, which depends on the load that the finished double wall shall be able to withstand. Wall ties are to be found in many different sizes and shapes. Traditionally, wall ties are made of a smooth wire with a diameter of 3-4 mm. The material can be stainless, acid-proof steel or tin-bronze. The length of the tie can be between 10 and 40 cm. Where the shape of the tie is concerned, the tie can be straight and be pro- vided at the one end with means for fortification in the form of a thread or an expansion anchor. The other end of the tie can be bent in the formation of an angle piece. During the building of the wall, the fortification part is fastened by screwing or tightening in, while the second part of the tie is intended to be built into the mortar in the joint in the brickwork. Ties are also be to be found which are bent over at this end in the formation of an eye, which provides a better fastening in the mortar and herewith a greater holding strength. These ties are each dimensioned and shaped especially for use in different wall materials and dimensions, such as light-weight concrete, cinder blocks and wooden plates which comprise the inner wall, while the other end is shaped for building into the mortar in the joint in the outer wall. The tie is dimensioned on the basis that there is no binding between the smooth wire and the mortar, so that this is not included in the calculations for the holding power of the tie. This means that use must be made of a relatively large number of ties in order to ensure an adequate holding strength, and this gives rise to increased building work at the same time that a relatively large number of ties must be used. The object of the invention It is the object of the invention to achieve an additional holding strength for increasing the extraction force of the tie, and according to the invention this is achieved by producing the tie from a wire, which is rough on the surface. It is hereby achieved that the wire contributes towards the securing, since as a reinforcing rod it is secured to a better degree, i.e. enters into engagement, with the mortar. The effect of the roughness is that water will not run along the wire but drip off the wire. This results in increased cohesion between wire and mortar and herewith an increased holding force, so that the number of ties can be considerably reduced. The building work is hereby made easier and the number of relatively expensive ties can be reduced. As disclosed in claim 2, to let the roughness consist of projections distributed uniformly along the wire, a good cohesion with the mortar is achieved. As disclosed in claim 3, to let the projections extend in two or more rows, the production of the wire can be made relatively simple, in that each stamping tool needs only to process a limited part of the surface of the wire. As disclosed in claim 4, to let the projections extend at an angle in relation to the longitudinal direction of the wire, a high degree of tensile strength is achieved in the direction of the wire. As disclosed in claim 5, by letting the projections in the individual rows be displaced in relation to one another, an even distribution of the projections is achieved and herewith a uniform and secure anchoring in the mortar. As disclosed in claim 6, by letting the angled projections extend in mutually opposite directions, further security is achieved for engagement in the mortar with regard to thrust and traction. Finally, as disclosed in claim 7, it is expedient for the angle of the projec- tions to be around 45° in relation to the longitudinal direction of the wire, in that a maximum tensile strength is achieved hereby. The drawing In the following, examples of embodiments of the wire according to the in- vention will be described in more detail with reference to the drawing, where fig. 1 shows a wall tie with an eye at each end, fig. 2 shows a wall tie with a smaller eye at each end, fig. 3 shows a close-up view on a larger scale of the wall tie seen from the side with the projections extending in opposite direc- tions, fig. 4 shows a cross-section of the wire seen in the direction IV-IV in fig. 3, and fig. 5 shows a piece of a wall tie seen from the side and with the projections extending in the same direction. Description of the example embodiments In figs. 1 and 2 are shown examples of wall ties 1 , both of which are made of wire 2 which is rough 5 on the surface. Both of the examples shown are provided with eyes 3, 4 at both ends, where said eyes are of different configuration, but there is nothing to pre- vent the wall ties according to the invention from being configured and equipped differently, i.e. they can be bent in another shape or provided with threads or expansion anchors as examples. The important aspect is that the wire 2 is provided with a rough surface, which means that the whole of the built-in part of the wall tie contributes to the fastening and is herewith included in the calculation of the overall extraction strength of the wall tie. Figs. 3-5 show an example of such a rough wire seen on a larger scale. As will appear especially from fig. 4, the surface of the wire is processed to provide three webs or rows in such a manner that a deformation from a stamping tool forms the space between projections 6, which will appear as ribs on the core 2 of the wire itself. As will be seen from fig. 3 and 5, the projections 6 in each of the three rows are thus placed with the same distance between them, and also that the projections 6 in a row are displaced at a half of the projection distance in the formation of the greatest possible, uniform roughness. Finally, the projections extend at an angle of about 45° in relation to the longitudinal direction of the wire in the formation of a pattern extending in an inclined manner. In addition to their roughness, these projections also have a draining-off effect on the water, which surrounds the wall tie during and after the build- ing-in, in that the projections will collect possible water so that the water drips off and does not seep along the wire. Possible insulation materials are hereby spared. Moreover, a maximum binding with the mortar is ensured and herewith the maximum holding power after building into the mortar. A wall tie of rough wire configured in this manner will provide a resulting holding power which is considerably higher than that of a corresponding tie made of smooth wire which is not held fast by the mortar. The result is that use can be made of fewer ties for double walls with the same strength, which is not only labour-saving but also reduces the consumption of wall ties.

Claims: CLAIMS 1. Wall tie of wire for use in the building of double walls, and where at least the one end of the wire is placed in the mortar layer, characterized in that the wire (2) is rough (5) on the surface. 2. Wall tie according to claim 1, characterized in that the roughness (5) consists of evenly distributed projections (6). 3. Wall tie according to claim 2, characterized in that the projections (6) extend in two or more rows, each of which extends in the longitudinal direction of the wire (2). 4. Wall tie according to claim 2 and 3, characterized in that the projections (6) extend at an angle in relation to the longitudinal direction of the wire (2). 5. Wall tie according to claim 3 and 4, characterized in that the projections (6) in the individual rows are displaced in relation to one another in the formation of an even distribution of the projections (6) on the surface of the wire (2). 6. Wall tie according to claim 4, characterized in that the inclined projections (6) in a row extend in the opposite direction in another row. 7. Wall tie according to claims 4-6, characterized in that the inclined direction of the projections (6) is about 45° in relation to the longitudinal direction of the wire (2). AMENDED CLAIMS [received by the International Bureau on 12 September 2001 (12.09.01); original claim 1 amended; remaining claims unchanged (1 page)] 1. Wall tie of wire for use in the building of double walls, and where at least the one end of the wire is bent to form an eye to be built into the mortar layer, characterized in that the wire (2) is rough (5) on the surface. 2. Wall tie according to claim 1, characterized in that the roughness (5) consists of evenly distributed projections (6). 3. Wall tie according to claim 2, characterized in that the projections (6) extend in two or more rows, each of which extends in the longitudinal direction of the wire (2). 4. Wall tie according to claim 2 and 3, characterized in that the projections (6) extend at an angle in relation to the longitudinal direction of the wire (2). 5. Wall tie according to claim 3 and 4, characterized in that the projections (6) in the individual rows are displaced in relation to one another in the formation of an even distribution of the projections (6) on the surface of the wire (2). 6. Wall tie according to claim 4, characterized in that the inclined projections (6) in a row extend in the opposite direction in another row. 7. Wall tie according to claims 4-6, characterized in that the inclined direction of the projections (6) is about 45° in relation to the longitudinal direction of the wire (2).

Inventors: LAURSEN KNUD, LAURSEN, KNUD
Applicants: LAURSEN KNUD, MIDTJYDSK MURBINDERFABRIK AS, LAURSEN, KNUD, MIDTJYDSK MURBINDERFABRIK A/S
Application year: 2001
Main classification: E04C5
IPC codes: E04B1, E04C5