Wire fabrics and structure – Fabrics – Quadrangular mesh
Reexamination Certificate
1999-10-25
2001-08-28
Calvert, John J. (Department: 3741)
Wire fabrics and structure
Fabrics
Quadrangular mesh
C245S001000, C256S012500, C256S013000, C256S032000, C256S033000, C256S034000, C256S045000, C256S046000, C256S047000
Reexamination Certificate
active
06279858
ABSTRACT:
The invention concerns wire netting for a gravel screen or for protecting a soil surface layer which is woven from corrosion-resistant wires and is either placed on the surface of the soil or is secured in an almost upright position on a slope or something similar.
In the case of a known wire netting which is very frequently used, the same is formed from a hexagonal wire netting as is shown in the enclosed drawing (FIG.
8
). Such wire netting consists of galvanized steel wires with low bending- and tensile strength values so that the latter may be stranded during weaving. The hexagonal shape of the individual meshes results following the repeated stranding of two wires which are woven together, whereby these stranded points run in the longitudinal direction of the netting and the individual wires in between run diagonally. In the shape in which they are manufactured and used, these wire nettings form an almost two-dimensional shape, ie. when regarded as a cross-section, this wire mesh is almost linearly formed since, due to their low resistance, these wires may be bent into any shape using less power consumption. These wire nettings are rolled up for storage and transportation and they require a lot of space for this. When unrolling these meshes at the assembly site at the same time, a further drawback of the latter is the fact that due to having been rolled up, these meshes very rapidly open and spread out by themselves.
When using such wire nettings as embankment protection components on steep, unstable embankments, the latter must be reinforced with stranded wires which are strained at regular intervals in a diagonal, longitudinal and/or cross direction above the wire netting or are woven into the latter. In addition, they should be provided with edge reinforcements and revetments anchored in the soil should be provided at regular intervals of one to five meters above the whole area so that the wire nettings ensure adequate surface-covering support for the surface layer which is at risk of sliding or having the surface area become detached. However, wire nettings are exposed to an increased risk of breakage at the stranded points.
On the other hand, the present invention has been based on the problem of creating a wire netting according to the type mentioned at the beginning which is formed in such a way that with this, as opposed to the known wire nettings, a cheaper and lighter weight covering is obtained for easier assembly on an embankment or gravel buttress. In addition, using this wire netting as embankment protection, improved conditions should be created for consolidating layers of vegetation or for holding in place humus or sprayed on layers on the covered soil, consolidating layers of vegetation or restraining humus or sprayed on layers on the soil which is covered. Furthermore, this wire netting should be able to be folded up in order to save space during its storage and transportation.
According to the invention, the problem is solved by the fact that the wires in the wire netting are manufactured from heavy-duty steel whereby this steel wire, as opposed to the known wire nettings, should preferably have an up to three times higher tensile strength which is within the region of 1000 to 2200 N/mm2.
In comparison to a known wire netting, by using this wire netting according to the invention with an assumed nominal strength, for a specific area of cover, more than half of the weight may be reduced, whereby substantial cost savings should result with the regard to the material required as well as the removal and assembly of such netting. Furthermore, due to the high bending strength of the wires, in case of a possible breakage occurring in the wire, the risk of a ladder arising may be reduced.
Due to its increased bending strength even in a stretched state, a three-dimensional or mattress-shaped structure is obtained when using this wire netting according to the invention. As a result, this netting may be used when covering earth, for example, an embankment and in addition, to hold in place or stabilize layers of vegetation or sprayed on coverings.
A further advantage of this wire netting consists of the fact that this netting, which consists of interwoven, single, spiral-shaped, bent wires, may be folded up and accordingly, it takes up less space during storage and transportation.
REFERENCES:
patent: 3812741 (1974-05-01), Heine
patent: 4072295 (1978-02-01), Roberts
patent: 4124183 (1978-11-01), Herrig et al.
patent: 4188020 (1980-02-01), Herrig et al.
patent: 4860997 (1989-08-01), Schoenheit et al.
patent: 5996972 (1999-12-01), Kaiser
patent: 491195 (1992-06-01), None
Calvert John J.
Fatzer AG
Hurley Shaun R
Wenderoth , Lind & Ponack, L.L.P.
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