EP1458912B1 - Woven grid - Google Patents

Abstract

Individual yarns (2 or 4) of a yarn bundle (3 or 5) in one mesh (6) are longer than other yarns of the same bundle. The longer yarns (4') run meanderingly and form at least one open loop or a bulge (7). The open loops protrude upwards and downwards from the fabric plane and the longer yarns are 15-25% longer than the other yarns of the same bundle. An Independent claim is made for manufacturing the lattice.

Description

The invention relates to a wide-mesh fabric, in which several warp threads composed of warp strands and several Wefts composing weft bundles clear Limiting mesh, where at the intersection of the right angle mutually extending Kettfadenbündel and weft bundles the warp threads are interwoven with the wefts.

With "mesh" are in this description of the warp strands and Weft bundles formed rectangular or square grid openings designated.

Mesh fabric of this type, which - when used with a polymeric plastic impregnated or coated - in particular for reinforcing bitumen-bound Road surfaces or for strengthening cement or gypsum bound Mortar layers or as a geogrid for reinforcing soil application find are known from DE 20 00 937; 31 20 661; 31 36 026; 41 23 055 and 199 62 441.

The warp threads and the weft threads are preferably made of multifilaments Synthetic yarns of high tensile strength, in particular of aramid, polyester or like. Glass filament yarns may also be used.

The warp thread bundles and the weft bundles settle together at least four threads.

As a means which the Kettfadenbündel, the weft bundles and their Wrapped crossing points and thus fixed the mesh and against can protect chemical and mechanical stress, depending on the Intended use a PVC plastisol, a latex dispersion or dispersions from bitumen, acrylates or corresponding soft plastics as well Be mixtures of it.

Under mesh fabrics are also such scrims to understand, in which the Warp threads and the weft threads at the intersections not with each other but by other techniques, in particular Rascheltechnik or by gluing or welding, connected together are.

The invention has for its object to provide a mesh fabric at the webtechnisch the mesh fabric is given a larger volume and when used as a geogrid better teeth with the to be reinforced Ground is reached.

This object is achieved in that individual threads of a thread bundle per stitch are longer than the inside width of the stitch and are longer than other threads of the same thread bundle, with the longer Filaments wavy and per stitch at least one open loop or bulge.

Characterized in that a part of the weft or warp threads within the clearance a stitch are longer than a second part of the weft or warp threads of the Same thread bundle, the longer threads per flake form bulges or open loops, for the most part from the plane of the mesh fabric stick up or down.

Thus, the protruding out of the plane of the mesh fabric bulges or open loops do not fall into the plane of the mesh, that will Mesh fabric by impregnation or by coating with a stiffened polymeric plastic.

The different length of the weft threads or warp threads per stitch can be produced by using weft threads or warp threads come, for example, in a heat treatment different shrink or stretch differently.

For yarn layers, individual warp threads of a warp thread bundle and / or individual weft threads of a weft bundle per stitch from the lattice plane be lifted out before the scrim passes the place where the Warp threads with the weft threads by rustling, gluing or welding get connected.

For geotextiles is a mesh fabric after the. DE 199 62 441 A1 particularly advantageous. In this mesh fabric, the warp thread bundles are in a first Warp group and a second warp group divided and the first Warp thread group crosses the second warp thread group of the same warp thread bundle in the manner of a half-turn per stitch once. This is the first warp thread always at the top and the second warp thread always at the bottom. At the intersections of warp and weft threads are the threads individually or in groups interwoven.

By a stronger tension in the warp direction is achieved that the Threads of the two zigzagging and each stitch once crossing warp thread groups of a bundle in particular in the field of Crossing intersections closer together, which has the consequence that the Mesh fabric in the warp direction is less yielding and without further Stretching is able to absorb large forces and on the other hand, that part of the Weft threads loop around the mutually shifted warp thread groups S-shaped, during the part of the weft threads woven in antiphase the Crossing point substantially pass through, so this part of the Weft threads per stitch is longer than the clear width of the stitches determining Part of the shorter threads.

The mesh fabric according to the invention with protruding from the plane of the fabric Loops are particularly advantageous for many applications. It Not only will a better mesh with a soil to be reinforced achieved, but the mesh fabric according to the invention is also advantageous for Reinforcement of hardenable masses and products, eg. B. screeds and gypsum Concrete products, or as a carrier web in the production of bonding or curing products made of plastic, gypsum or concrete mortar, which are sprayed or molded onto the carrier fabric, so that the Loops protrude into the hardened products, and those over the Carrier fabric remain connected to each other. Furthermore, with the above Looped grid mat suitable, the supporting part of a drainage mat to build. Furthermore, it is possible to follow from the plane of the tissue up, down or up and down protruding loops parts be attached, for. As machines, or are inserted through, e.g. Steel reinforcements or drainage tubes.

Finally, the mesh fabric according to the invention is suitable for erosion protection, as anti-slip mat or as snow brake.

The covered with an elastic plastic layer mesh fabric with protruding loops has a very large stiction. As a liner on a stone wall of a slope wall can this in the Embankment anchored grille connect the wall with the embankment.

Fig. 1

eine Draufsicht auf das Gittergewebe nach der Erfindung,

Fig. 2

eine Stirnansicht des Gittergewebes,

Fig. 3

eine Draufsicht auf ein weiteres Ausführungsbeispiel nach der Erfindung,

Fig. 4

eine vergrößerte Schnittansicht einer Kreuzungsstelle eines Gittergewebes,

Fig. 5

eine vergrößerte Schnittansicht einer Kreuzungsstelle des Gittergewebes gemäß Fig. 3.

In the following description, embodiments of the invention will be explained in more detail with reference to the drawings. The drawings show in:

Fig. 1

a plan view of the mesh fabric according to the invention,

Fig. 2

an end view of the mesh fabric,

Fig. 3

a top view of a further embodiment of the invention,

Fig. 4

an enlarged sectional view of a crossing point of a mesh fabric,

Fig. 5

an enlarged sectional view of a crossing point of the mesh fabric of FIG .. 3

The large-mesh fabric 1 according to FIGS. 1 and 2 will consist of several Warp threads 2 composed of warp strands 3 and several Wefts 4 composed weft bundles 5 formed. The Kettfadenbündel 3 and the weft bundles 5 enclose rectangular or square grid openings or meshes 6. A part 4 'of the weft threads 4 are per stitch 6 longer than another part of the weft threads 4, so that the longer wefts form bulges or open loops 7, the protrude large part up and down from the plane of the mesh fabric 1.

The weft threads 4,4 'are at the intersections 8 individually or in groups woven with the warp threads 2 of the warp thread bundles. Furthermore, the mesh fabric 1 with its open loops 7 by impregnation or coating stiffened with a polymer plastic.

In Fig. 3, a large mesh fabric 1 is shown, in which the warp thread bundles 3, for example, eight warp threads 2 and eight weft bundles Weft threads 4,4 'have.

The warp thread bundles 3 are divided into a first warp thread group 3 'and a second warp thread group 3 ". These two warp thread groups 3 'and 3" are on the crossing points 8 with the weft threads 4 of the weft bundles. 5 woven. Between two weft bundles 5, i. per stitch 6, crossed a warp thread group 3 'in each case the other warp thread group 3 "of a warp thread bundle 3 in the manner of a half-turn.

The interweaving at the intersections 8 takes place in such a way that a first Part of the weft threads 4 of a weft bundle 5 on the warp threads 2 of the first warp thread group 3 'and a second part 4' of the weft threads a weft bundle 5 under the warp threads 2 of the first warp thread group 3 'and over the warp threads 2 of the second warp thread group 3 " each odd-numbered weft thread runs over the first warp thread group 3 ' and under the second warp group 3 ", while each even weft under the first warp thread group 3 'and then over the second warp thread group 3 "of the warp thread bundle 3 runs.

By strong train on the warp strands 3 stretch in zigzag extending warp thread groups 3 'and 3 ", so that at the intersection. 8 a part of the weft threads - as shown in FIG. 5 - S-shaped the warp thread groups while another part of the weft threads cross the intersection 8 happened to me less loss of length.

As shown in FIG. 5, the zigzags move at the intersections 8 extending warp thread groups 3 'and 3 "closer together when on the Kettfadenbiindel 3 a tensile force is applied. This push the inner edges of the warp thread groups 3 'and 3 "slightly above each other, so that a Part of the weft threads at the intersections 8 go through a longer path must as the other part of the weft bundle. 5

LIST OF REFERENCE NUMBERS

1

mesh

2

warp

3

Kettfadenbündel

3 '

first warp thread group

3 '

second warp thread group

4

weft

4 '

longer weft

5

Weft bundles

6

Mesh, grid opening

7

open sling

8th

intersection

Claims (10)

1. A wide-mesh woven grid (1) for reinforcement purposes, in which warp thread bundles (3) composed of a plurality of warp threads (2) and weft thread bundles (5) composed of a plurality of weft threads (4) intersect and define mesh or grid openings (6), characterised in that individual threads (2 or 4) of a thread bundle (3 or 5) defining a mesh opening (6) are longer than other threads of the same thread bundle (3 or 5), wherein the longer threads (4') extend in wavy manner and form for each mesh opening (6) at least one open loop or bulge (7), which is stiffened and projects upwards and/or downwards out of the plane of the woven grid (1).
2. A woven grid according to claim 1, characterised in that the woven grid (1), including the loops (7) projecting out of the grid plane, is stiffened by sheathing with a polymeric plastics material (9).
3. A woven grid according to either one of claims 1 and 2, characterised in that the longer threads (4') of each mesh opening (6) are formed by threads from the weft thread bundle (5).
4. A woven grid according to any one of claims 1 to 3, characterised in that the longer threads (4') of each mesh opening (6) are 15 to 25% longer than the other threads (4) of the same thread bundle (3, 5).
5. A woven grid according to any one of claims 1 to 4, characterised in that the threads (4, 4') of the weft thread bundles (5) are interwoven with the threads (2) of the warp thread bundles (3) at the points of intersection (8) .
6. A woven grid according to claim 5, characterised in that the warp thread bundles (3) are divided into a first warp thread group (3') and a second warp thread group (3") and the first warp thread group (3') crosses over above the second warp thread group (3") of the same warp thread bundle (3) at each mesh opening (6) in the manner of a half-twist and the warp threads (2) of both warp thread groups (3', 3") are interwoven with the weft threads (4, 4') at the points of intersection (8).
7. A woven grid according to claim 6, characterised in that the warp thread group (3', 3") is interwoven with the weft threads (4, 4'), this being done in such a way that, at all points of intersection (8), a first part of the weft threads (4) of a weft thread bundle (5) extends over the warp threads (2) of the first warp thread group (3') and under the warp threads (2) of the second warp thread group (3") of a warp thread bundle (3) and a second part of the weft threads (4) of the weft thread bundle (5) extends under the warp threads (2) of the first warp thread group (3') and over the warp threads (2) of the second warp thread group (3") of a warp thread bundle (3).
8. A woven grid according to claim 7, characterised in that each odd-numbered weft thread (4) of a weft thread bundle (5) belongs to the first part and each even-numbered weft thread (4') belongs to the second part of the weft threads of a weft thread bundle (5).
9. A method of producing a woven grid according to either one of claims 7 or 8, characterised in that the woven fabric is put under tension in the warp direction, whereby the zigzagging warp thread groups (3', 3") are stretched and pushed closer together at the points of intersection (8), whereby a first part of the weft threads (4) loops in the manner of an S around the two warp thread groups (3', 3") at the points of intersection (8) while the second part of the weft threads (4) passes in substantially stretched-out or rectilinear manner through the two groups (3', 3") of a warp thread bundle (3), whereby the first part of the weft threads is shorter at the mesh opening (6) than the second part of the weft threads and the second part of the weft threads is longer at the mesh opening (6) and forms open loops or bulges (7) and the woven grid is fixed with the warp in the tensioned state.
10. A method according to claim 9, characterised in that fixing of the woven grid is performed by impregnation or coating with a polymeric plastics material, in particular a PVC plastisol or a latex dispersion.

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