Geotextile fabric

Abstract

Geotextile fabric (1), in particular for stabilizing an unpaved subsoil, comprising: a plurality of weft threads (3) and a plurality of warp threads (2), and a reinforcing element (5) provided in or on at least one weft thread (3) and / or in or on at least one warp thread (2), wherein the weft threads (3) and the warp threads (2) comprise natural fibers, wherein the reinforcing element (5) comprises inorganic, mineral and / or metallic material.

Description

The invention relates to a geotextile fabric, a use of a geotextile fabric, a method for producing a twist thread for geotextile fabric and a method for producing a geotextile fabric.Running water, rainfall, snow melt or wind can lead to soil erosion. For example, grooves, grooves or grooves may form. Although the phenomenon of soil erosion fundamentally also occurs naturally, it is often only caused or enhanced by human influence. For example, newly applied embankments, which initially comprise exposed (or unprotected) surfaces, are exposed relatively unprotected to the influence of rain and wind. Soil erosion becomes problematic when structures located in the vicinity are thereby endangered or at least (for example, with regard to their stability) are influenced. The ground erosion then often leads to the need for costly countermeasures or to the risk of people.In order to overcome this problem, the use of geotextiles is known in the prior art. Geotextiles are flat or three-dimensional textiles which are usually permeable to water and vegetation. Geotextiles are usually provided in the form of woven fabrics, nonwoven fabrics, fiber mats, grids, braids, knits and combinations of these two variants. Geotextiles are used, for example, in the case of embankments and water fountains freshly covered with upper floor. By placing the geotextiles on the bottom of the embankments, effective protection against water and / or wind erosion can be achieved. The soil should be stabilized until natural vegetation can take on a stabilizing role.DE 200 01 583 U1 discloses a geoflux mat made of biodegradable organic fibre material, in which dried sea grass cleaned from foreign substances and twisted into one another is used as the fibre material, wherein the sea grass is mechanically connected to one another.DE 202 14 540 U1 shows a multi-ply geo-welcoming mat, consisting of a plurality of functional layers connected to one another.Therefore, the trend is toward providing geotextiles that are made from or at least comprise synthetic starting materials. Synthetic starting materials are, for example, polypropylene, polyethylene, polyester or polyamide. Compared to geotextiles made of natural fibers, synthetic starting materials have the advantage of an often significantly longer service life. However, the properties of durability and non-redistakability, which are useful and often required, for example for road and underground construction, are also a disadvantage according to recent findings for use in reculture or engineering biological measures. Recycling is often not realizable due to the associated expenditure on labor costs. Disposal, generally comprising transport (for example also into another country or another continent, for example from Europe to Africa or Asia), deposition and incineration, is hazardous to the environment. In addition, when using conventional synthetic materials, micromaterials, such as microplasty, are often secreted into the environment. Bioplastics and bioplastics can also secrete micromaterials after or during their use. Micro-fabrics are potentially hazardous to humans, environments, fauna, and flora.A less damaging alternative, in contrast, is offered by geotextiles made of natural fibers. Natural fibers can be obtained, for example, from renewable raw materials. However, compared to synthetic geotextiles, these usually have a shorter service life and often also a lower stability, so that they often eliminate for this reason.It is therefore an object of the present invention to provide a geotextile which does not release harmful micromaterials, such as microplasty, into the environment in use and which nevertheless has good durability and stability.This object is achieved with a geotextile fabric according to claim 1, a use according to claim 7, a method according to claim 8 and a method according to claim 10. Further features, advantages and embodiments are evident from the dependent claims, the description and from the figures.According to the invention, a geotextile fabric is provided, in particular for stabilizing an unfixed ground. The geotextile fabric comprises a plurality of weft threads and a plurality of warp threads, and a reinforcing element provided in or on at least one weft thread and / or in or on at least one warp thread. The weft threads and the warp threads comprise natural fibers. The reinforcing element comprises inorganic, mineral and / or metallic material.The geotextile is provided as a fabric. A tissue can allow unhindered growing through of plants, e.g. grasses, herbs and / or pioneering woods. For example, it can be provided that for ground stabilization the geotextile fabric is placed flat on a ground and seed is applied in the interstices of the yarns of the fabric. The geotextile fabric can preferably be designed to stabilize an unfixed ground. An unfastened subgrade may be a soil on which no vegetation is yet present. An unfixed ground may comprise, for example, an exposed floor surface or a newly laid slope. The unfastened ground can be, for example, ungreened and unfastened ground. The geotextile fabric may be a three-dimensional geotextile structure. The geotextile fabric can be understood generally as a net-like structure. The geotextile fabric can be a knitted fabric or a raschel fabric.The geotextile fabric comprises a plurality of weft yarns and a plurality of warp yarns. Warp threads are threads which are stretched in the longitudinal direction during weaving. Generally, a longitudinal direction may be defined as the direction along which the warp threads extend. Warp threads are threads which run parallel to a weaving edge of the fabric. The individual warp threads of the plurality of warp threads can preferably run parallel to one another. The weft threads run transversely to the warp threads. The geotextile fabric can comprise two yarn systems, namely a yarn system of the weft yarns and a yarn system of the warp yarns. A yarn system in textile production can refer to the totality of yarns which are incorporated into a fabric in each case according to the same principle. Preferably, the geotextile fabric can be a flat fabric. A flat fabric refers to a fabric with a warp yarn system and a weft yarn system, respectively. For example, the flat fabric may include a plurality of warp yarns and a weft yarn. However, more weft threads can also be provided.The weft threads and the warp threads comprise natural fibers. The weft threads and / or the warp threads may predominantly (i.e. more than 50%) comprise natural fibers. Particularly preferably, the weft threads and the warp threads, optionally in addition to the reinforcing element, can consist essentially exclusively of natural fibers. Essentially exclusively, it can be understood here that traces of other materials may still be present (unavoidable or difficult to avoid). Natural fibers are fibers from natural sources such as plants or animals. Natural fibers have typically not been subjected to synthetic manufacturing steps and / or chemical conversion reactions. Organic natural fibers are preferably provided. Vegetable natural fibers are particularly preferably provided. Vegetable natural fibers are natural fibers derived from vegetable sources. Natural fibers, in particular organic natural fibers, can usually decompose over time. Advantageously, disposal of the natural fibers may thus not be necessary. Remains of the natural fibers can serve, for example, as nutrients or humus for plant growth. It is thus advantageously possible, for example, to support planting of a surface by the natural fibers.The reinforcing element is provided in or on at least one weft thread and / or in or on at least one warp thread. In a thread, it can mean that the reinforcing element is integrated into the thread. For example, the reinforcing element can be provided as a core of the thread. A thread can mean that the reinforcing element abuts the thread and / or is fastened to the thread. The reinforcing element can be twisted around a thread and / or twisted with it, for example. The reinforcing element can be interlaced with the thread, for example. Preferably, several reinforcing elements can be provided. It can be provided that for each warp thread and / or weft thread, on and / or in which a reinforcing element is provided, at least one reinforcing element is provided in each case or a plurality of reinforcing elements are provided in each case. Preferably, a reinforcing element can be provided on or in a plurality of weft threads and / or on or one of a plurality of weft threads. Particularly preferably, the reinforcing element can be provided on or in substantially all weft threads and / or on or a substantially all weft threads. Preferably, the reinforcing element has a longer service life than the natural fibers. The reinforcing element can advantageously increase a usability for an intended function and / or a stability or tensile strength of the geotextile fabric. The reinforcing member may be a reinforcing wire. The reinforcing element comprises inorganic, mineral and / or metallic material. The reinforcing element may comprise metal wire, ropes, strands, metal threads. The reinforcing element can have a higher hardness than the warp threads and / or the weft threads. Preferably, the reinforcing element predominantly comprises inorganic, mineral and / or metallic material. The reinforcing element may be, for example, a metal wire or a metal thread. Metallic material can advantageously have a high durability. Metallic material may be less harmful to the environment, especially vegetation and fauna, compared with a plastic material. Advantageously, metallic material may have a high tensile strength and increase the tensile strength of the geotextile fabric. Inorganic materials may generally comprise metals. Inorganic materials may include glass fiber. Advantageously, inorganic material does not comprise oil-based polymers. Thus, with the use of inorganic material, settling of microplasty into the environment can be prevented. Preferably, the mineral material is inorganic. Optionally, the mineral material may comprise asbestos, glass, ceramic and / or basalt. Preferably, the mineral material is a flexible mineral material, more preferably an elastically flexible mineral material. In the past, it was not readily possible to provide a reinforcing element comprising inorganic, mineral and / or metallic material in a woven fabric, since there are in particular limitations in this case during the weaving process. Therefore, this has not been considered either. However, it has been found in the present case that inorganic, mineral and / or metallic material can surprisingly also be woven as described according to the invention. Therefore, a fabric can be provided which overcomes the disadvantages of the prior art.Advantageously, several advantageous properties can be achieved in combination with the geotextile fabric according to the invention. On the one hand, natural fibers can achieve a water retention capacity, a rotability and a complete biodegradability. For example, natural fibers (e.g. during or after the radication) can serve as nutrient feed or as fertiliser for plant growth. Thus, for example, establishing a vegetation layer protecting the soil can be promoted. By using a tissue, unhindered ingrowth and rooting can be made possible. On the other hand, the reinforcing element can achieve an increased durability and an increased stability or tensile strength and an increased service life and elongation of the fabric. For example, when the natural fibers are redistributed by the reinforcing element or preferably by a plurality of reinforcing elements, a framework for further stabilizing a floor surface can still remain. Thus, for example, long-lived erosion protection can be provided. Furthermore, the fabric with the reinforcing element can absorb higher loads than without the reinforcing element. For example, the tissue can be overshadked without the tissue being damaged (i.e. losing its stabilizing effect). Furthermore, the tissue can thus be traveled on. Advantageously, no plastic material is required for the higher stability. This makes it possible to prevent delivery of microplasty into the environment. Damage to the environment can thus be prevented. The reinforcing element may be made of an inert material so that it does not react with other materials or elements, or reacts only very weakly (i.e., the reinforcing element may be inert). For example, the reinforcing element can be an alloy of iron and further additions, so that an inert metal is formed. In one embodiment, the reinforcement member is formed of stainless steel. It can thus be ensured that even if the geotextile remains at the installation site for a longer time, no separation of materials or substances or reactions with other substances at the installation site occur. Consequently, the influence on the environment can be reduced.Preferably, the reinforcing element is arranged such that it extends substantially parallel to the respective weft thread and / or warp thread. The respective weft thread or warp thread is preferably that thread on and / or in which the reinforcing element is provided. For example, the reinforcing element can be a reinforcing wire which runs along the respective weft thread or warp thread. The reinforcing element can, for example, extend spirally around at least one thread, preferably around at least one warp thread. A spiral shape can enable particularly good expansion properties in that a significant tensile force can be maintained even at greater expansion (for example 100% expansion). The reinforcing element can extend along substantially the entire extent of the respective weft thread. A course along substantially the entire extension may advantageously allow a continuous reinforcement."Substantially" can be understood here to mean that, for example, at the end of the respective thread, the reinforcing element is exposed somewhat earlier. For example, at least one end of the thread can be free of the reinforcing element by one or a few centimeters, preferably less than 5 cm. For example, it may be advantageous for manufacturing reasons or for better flexibility in the edge region of the geotextile if the reinforcing element is exposed somewhat earlier than the end of the respective thread. In other words, the reinforcing element can extend only in sections along the respective thread.The geotextile fabric is preferably made free of plastic. Advantageously, a plastic-free geotextile fabric can be used to eliminate pollutants such as microplasty into the environment. An environmental risk can thus advantageously be prevented or reduced. Additionally or alternatively, it can be provided that the geotextile fabric is not chemically treated. Thus, the geotextile fabric can be advantageous in this respect over synthetic geotextiles. Therefore, the geotextile fabric according to the present embodiment can remain in its installation site and need not be removed.Preferably, the warp threads and the weft threads are each produced as twisted threads from at least two natural fiber yarns in each case. The respective at least two natural fiber yarns can be identical to one another or different from one another. In other words, the yarns may comprise two twisted natural fiber yarns. Natural fiber yarns are yarns made from natural fibers. The twisted warp threads and / or the twisted weft threads can be processed with at least one reinforcing element each. Processed can mean that the reinforcing element is arranged and / or fastened on or in the respective thread.Preferably, at least one reinforcing element is respectively braided or twisted into the twisted threads belonging to the warp threads. The twisted or braided reinforcing member may preferably be a reinforcing wire. Tests have shown that by twisting or braiding the reinforcing element, the tensile force that the geotextile fabric can absorb without failure can be significantly increased. For example, a test according to DIN 10319 was carried out, wherein the warp threads had a reinforcing wire made of stainless steel with a thickness of 0.8 mm. It has been found that even with an elongation of 100% in the longitudinal direction of the geotextile fabric, a tensile force of more than 50% of the maximum tensile force (approximately 20 kN / m at 21° C. and 42% humidity; with a width of the geotextile fabric of 220 mm) can still be absorbed. This value is significantly higher than is customary for conventional geotextiles. Even at a maximum tested elongation of 130%, the geotextile had a tensile force of about 5% of the maximum tensile force. It has thus been surprisingly demonstrated that a geotextile fabric with a reinforcing element made of inorganic, mineral and / or metallic material is additionally also extremely resistant.Preferably, at least one, preferably all, of the natural fiber yarns of the weft threads each has a reinforcing element, preferably a reinforcing wire, as core. The core is generally the core of a yarn or a rope surrounded by an outer material. In this case, the outer material preferably comprises natural fibers. Particularly preferably, the outer material consists of natural fibers. The core does not necessarily have to be formed from solid material, but can be hollow on the inside, as in coaxial cables, for example. In other words, the core may have an annular cross section. As a result, a particularly light geotextile fabric can be obtained which nevertheless has the improved mechanical properties. This is particularly advantageous when used on erosion-risk soils. Provision as a core preferably means that the reinforcing element is integrated into the yarns of the weft threads and following the course of the yarns. Particularly preferably, all of at least two twisted natural fiber yarns each have a reinforcing element as core. It has been found that the weft threads with the reinforcing element as core are well suited for the work during weaving of the geotextile fabric.Preferably, a diameter of the reinforcing element of the warp threads is 0.1 mm to 2 mm, preferably 0.5 mm to 1.5 mm, particularly preferably 0.6 mm to 1.0 mm. Most preferably, the diameter is substantially 0.8 mm. The reinforcing element can have, for example, a substantially round cross section which has the specified diameter. With such a diameter, a particularly good increase of the tensile force can be achieved, with at the same time minimal material consumption. An increase in the tensile strength is possible in particular in the range from 0.5 mm to 1.5 mm without the remaining properties of the geotextile fabric being impaired too much. A diameter of 0.6 mm to 1.0 mm is particularly well suited for weaving, with a simultaneous significant increase in the tensile force. In other words, a weaving speed can be increased at a diameter of 0.6 mm to 1.0 mm, since a weft yarn with such a reinforcing member can be easily handled by known looms.Preferably, a reinforcing element of at least one weft thread has a smaller diameter than a reinforcing element of at least one warp thread. This makes it possible to simplify the production process (weaving the geotextile). More precisely, the weft thread must be handled by the loom (i.e. by the shuttle) and in the process be deflected by approximately 180°. This is easier with a thinner reinforcing element than with a thicker one. The warp threads, on the other hand, can be unwound from a warp beam and merely displaced by shafts, so that the warp threads do not have to be deflected like the weft threads. Therefore, a reinforcing element of the warp threads can have a larger diameter (and thus an increased stability) without the weaving process being adversely affected. At the same time, however, the strength of the geotextile fabric can be increased by the thicker warp threads.According to a preferred embodiment, a diameter of the reinforcing element of the weft threads is 0.05 mm to 0.6 mm, preferably 0.1 mm to 0.5 mm, particularly preferably 0.2 mm to 0.4 mm. With the diameter, good interweaving of the threads can be made possible. A reinforcing element having a diameter of 0.1 mm to 0.5 mm can be particularly stable. A diameter of 0.2 mm to 0.4 mm may be particularly suitable for use with some natural fibers, such as coconut fibers.Preferably, the reinforcing element is made of stainless steel. Stainless steel may be particularly well suited for use in a geotextile fabric. For example, the reinforcing element can be a stainless steel wire. Stainless steel is advantageously resistant to moisture and corrosion. A reinforcement element made of stainless steel can counteract a continuous reduction of the tensile forces of the geotextile fabric during the redistributing of the natural fibers in a particularly efficient manner. Furthermore, a reinforcement element made of stainless steel can provide a relatively constant stabilizing force even under high loads. Furthermore, advantageously, with this embodiment, an planted vegetation can be given a permanent steel reinforcement. This allows permanent ground stabilization even over many years. For example, rainfall and especially sticking can generally result in the root horizon slipping off. With a reinforcement element made of stainless steel in conjunction with gravity, a permanent force on the root horizon can be achieved. This can effectively counteract the root horizon slipping off and thus offer effective surface erosion protection.Preferably, the natural fibers are coconut fibers. Alternatively or additionally, the natural fibers may be made of one or more of: kapok, cotton, flax, viscose, hemp, jute, ramie, sisal, manila, stinging, wool, hair, silk(s), cellulose. Coconut fibers can also be referred to as "coir.". Typically, coconut fibers are recovered from the outer cladding of still incompletely mature coconuts, in which the fibers are not yet severely wooded and therefore flexible. Due to a high lignin content, coconut fibers degrade organically only relatively slowly compared to other natural fibers. Therefore, with coco fibers, a relatively long lifetime of the natural fiber portion of the geotextile fabric can be made possible. The lifetime of the coconut fibres can usually be a few years. In addition, coconut fibers have a high tensile force compared to other natural fibers. Geotextile fabric made of natural fibers can also be very robust with respect to impacts and impacts. By producing with coconut fibers (e.g. as staple fiber yarn), the geotextile fabric can additionally be particularly flexible and conformable, whereby a good adaptation to a ground is possible. Coconut fibers are also very UV-resistant. Furthermore, coconut fibers can contribute to humus formation and thus promote a microclimate favorable for plant growth. Coconut fibre tissues are also advantageously suitable for storing water, which can further promote plant growthPreferably, the geotextile fabric is manufactured in plain weave. In a canvas weave, each warp yarn is alternately disposed above and below successive weft yarns. Advantageously, a particularly tight weave of the threads can be achieved with a plain weave. The geotextile fabric can be particularly stable and uniform in this embodiment. An adjustment of the warp and weft threads can be variable for each defined measurement path (e.g. 10 cm each).Preferably, the natural fibers are biodegradable. Preferably, the reinforcing element is not biodegradable. Biodegradable is to be understood as meaning that the natural fibers break down completely over time into carbon dioxide, water and biomass. The time of the degradation can preferably be several years, for example 3 to 10 years. Advantageously, biodegradable structural material (natural fibers) can thus be connected to inorganic or metallic non-biodegradable structural material (reinforcing element) by the natural fibers and the reinforcing wires. After the rottling, the biologically degradable natural fibers can be available as nutrients for vegetation when used as surface erosion protection. The decomposition products of the natural fibers are advantageously harmless to the environment. Furthermore, the natural fibers which decompose over time can have the positive effect that, when the (organic) substance of the natural fibers is vaporized, with the participation of oxygen and microorganisms, building blocks such as CO 2, NH 3, H 2 O, Mg and Ca can be released. These can in turn become nutrient humus by the interaction of microorganisms.A further aspect of the invention is a use of a geotextile fabric as described herein as a geotextile for stabilizing a substrate. All advantages and features of the geotextile fabric can be transferred analogously to use and vice versa. For example, the geotextile fabric can be used to prevent the degradation of soil material from being suspended. For example, the geotextile fabric can be used for slope stabilization. For example, the geotextile fabric can be used for dichairing. For example, the geotextile fabric can be used for the protection of shores on rivers or lakes. A surface of the mine roof or pond can be protected, for example, by the geotextile fabric by fastening the geotextile fabric with fastening means. Fastening means can be, for example, wood stakes and / or timbers. The geotextile fabric can be buried, for example, at an upper and lower edge of a shore and / or a embankment. For example, the geotextile fabric can be used for soil protection at landfill sites. For example, the geotextile fabric can be used for road tracks. For example, the geotextile fabric can be used in garden and landscape construction. For example, the geotextile fabric can be used for building greening. For example, the geotextile fabric can be used for drainage and filtration. For example, the geotextile fabric can be used to secure road edges. Preferably, the geotextile fabric can be used for protection of exposed and / or erosion prone soils. A ground may be exposed, for example, to rainfall and / or wind. Particularly preferably, the geotextile fabric can be used for protecting soils where higher periods of time are to be increasingly expected for establishing vegetation. Use of the geotextile fabric can be combined with planting plants on the soil protected by the geotextile fabric. Additionally or alternatively, use is possible for the following purposes: anti-wild animal protection, as a barrier, as a UV protection element on structures and constructions, as a climbing aid and / or guiding element for plants, such as hop, for filtering, for separating soil layers, as a container for tolk protection and for weevil protectionA further aspect of the invention is a method for producing a twist thread for geotextile fabric, comprising the following steps: (a) providing two natural fiber yarns and a reinforcing element, in particular reinforcing wire; (b) twisting the two natural fiber yarns together and with the reinforcing element, wherein, during the bringing together, the reinforcing element is arranged between the natural fiber yarns.All the advantages and features of geotextile fabric and use can be transferred analogously to the method of making a twisted yarn and vice versa. The natural fiber yarns can be obtained, for example, by spinning natural fibers, such as, for example, coconut fibers, into individual filaments or staple fiber yarn. These methods have been found to be well suited for producing twisted yarns, preferably warp yarns, for geotextile fabrics according to the inventionAccording to one embodiment, the natural fiber yarns are guided around a separating element from two sides and twisted behind the separating element. Preferably, the reinforcing element is guided around the separating element on the same side as a first of the natural fiber yarns, wherein the reinforcing element has an angle of 35° to 60° to the first of the natural fiber yarns when being brought together. This type of joining has proved to be particularly favorable both as regards a practicable manufacture and as regards a stability of the twist obtained. A particularly good tensile force of a correspondingly manufactured geotextile fabric can thus be achieved if the warp threads of the geotextile fabric consist of the twisted threads produced with this method. During twisting, the natural fiber yarns can be brought together, for example, at an angle of 30° to 80°, preferably 50° to 70°.A further aspect of the invention is a method for producing a geotextile fabric, in particular for stabilizing an unfixed ground, comprising the following steps: (a) providing first twisted yarns with reinforcing element, preferably produced as described herein, as warp yarns; (b) providing second twisted yarns as weft yarns, wherein the second twisted yarns are produced from at least two natural fiber yarns, wherein a reinforcing element is optionally provided as core for the natural fiber yarns; (c) weaving the fabric with the warp yarns and the weft yarns. The fabric may preferably be woven according to a plain weave. Optionally, the fabric may be woven according to one or more of the following weaves: a plain weave, a cat-butt weave, a body weave, an atlas weave, a satin weave, according to a leno weave. Optionally, the fabric may be woven from a derivative or combination of these weaves. Optionally, the fabric may be woven from shading or reinforced fades. All advantages and features of the geotextile fabric, the use and the method for producing a twisted yarn can be transferred analogously to the method for producing a geotextile fabric and vice versa. With the twisted threads used, a particularly well durable geotextile fabric can be woven particularly efficiently.Further advantages and features of the present invention are evident from the following description with reference to the figures. Individual features disclosed in the embodiments shown and in the description can also be used in other embodiments, unless this has been expressly excluded. The following are shown: FIG. 1 shows a detail of a geotextile fabric according to an embodiment of the invention, FIG. 2 shows a part of a natural fiber yarn of a weft yarn according to an embodiment of the invention; FIG. 3 shows an example of a woven fabric in plain weave; FIG. 4 is a diagram showing the production of a twisted yarn for a geotextile fabric according to an embodiment of the invention; FIG. 5 is a flow chart for a method of manufacturing a geotextile fabric according to an embodiment of the invention; FIG. 6 shows an example of a use of a geotextile fabric according to an embodiment of the invention; and FIG. 7 shows an example of a use of a geotextile fabric according to a further embodiment of the invention.FIG. 1 shows a detail of a geotextile fabric 1 according to an embodiment of the invention. The geotextile fabric 1 comprises a plurality of warp threads 2 running in the longitudinal direction L and a plurality of weft threads 3 running transversely to the warp threads. The reinforcing elements 5 comprise inorganic, mineral and / or metallic material. Preferably, the reinforcement elements are made of stainless steel. The warp yarns 2 and the weft yarns 3 are each twisted yarns made of two natural fiber yarns 4, such as coconut fiber yarns. On the warp threads 2 a respective reinforcing element 5 is provided which in this embodiment is twisted with the warp threads 2. Thus, the reinforcement elements 5 of the warp threads 2 run substantially helically around the warp threads 2. in other words, in the present embodiment, the reinforcement elements each extend wound around the respective warp thread 2. The geotextile of the embodiment shown in FIG. 1 is realized in a grid-like structure. This makes it possible to achieve a particularly advantageous covering of a subgrade to be secured.In a further embodiment, reinforcing elements 5 are also provided in the weft threads 3. The reinforcing elements 5 are integrated into the weft threads. In other words, the reinforcement elements 5 extend axially and internally in the respective weft thread 3.FIG. 2 is a schematic view of a weft yarn 3 in cross section. In FIG. 2, a part of a natural fiber yarn 4 of a weft yarn 3 can be seen by way of example in cross section, so that it can be seen that the natural fiber yarn 4 has a reinforcing element 5 as core. Preferably, all natural fiber yarns 4 of the weft threads 3 have a reinforcing element 5 as core. The reinforcing elements 5 of the weft threads 3 thus run substantially parallel to a main extension direction of the weft threads 3. Preferably, a diameter of the reinforcing elements 5 of the weft threads 3 is smaller than a diameter of the warp threads 2. The weft yarns shown in Fig. 2 can also be used in the embodiment shown in Fig. 1.The geotextile fabric 1 according to the embodiment shown in FIG. 1 is manufactured in plain weave. The canvas binding is schematically illustrated in FIG. 3. In the plain weave, each warp yarn 2 is alternately arranged above and below successive weft yarns 3.FIG. 4 schematically shows a production of a twist thread for a geotextile fabric. The process direction is from left to right in FIG. 5 The starting material is two natural fiber yarns 4 (feeding from top left and bottom left in FIG. 4 ) and one reinforcing element 5 (feeding from middle left in FIG. 4 ). The reinforcing member 5 is a reinforcing wire in the present embodiment. The natural fiber yarns 4 are twisted together and with the reinforcing element 5, wherein during the twisting the reinforcing element 5 is arranged between the natural fiber yarns 4. The twisting is driven by a rotating element 10 which twists the natural fiber yarns 4 and the reinforcing element 5. The natural fiber yarns 4 are thereby guided around a separating element 8 from two sides and twisted behind the separating element 8, driven by the rotating element 10. The reinforcing element 5 is guided around the separating element 8 on the same side as a first of the natural fiber yarns 4, 41. In this embodiment, the reinforcing element 5 has an angle W of approximately 35° to the first of the natural fiber yarns 41 when brought together. It has been found that an angle between 30° and 40° is particularly advantageous for twisting the reinforcing element 5 with the natural fiber yarn 4, 41. As a product of this process step, a weft thread 3 and / or a warp thread 2 is obtained.In FIG. 5, a schematic flow diagram of a method for producing a geotextile fabric 1 according to an embodiment of the invention is shown. In a first step 101, first twisted yarns with reinforcing element 5 are provided as warp yarns 2. In a further step 102, second twisted yarns are provided as weft yarns 3. The second twisted yarns are made of at least two natural fiber yarns. Optionally, a reinforcing element 5 is provided as core for the natural fiber yarns of the weft threads 3. In a further step 103, the geotextile fabric 1 is woven with the warp threads 2 and the weft threads 3, preferably according to a plain weave.FIGS. 6 and 7 show examples of a use of a geotextile fabric 1. FIG. 6 shows how the geotextile fabric 1 is rolled out at a slope 20. The geotextile fabric 1 can be secured to the upper end 21 of the embankment 20 and to the lower end 22 of the embankment 20 by digging. By means of fastening means 23, such as e.g. earth nails or wire straps, the geotextile fabric 1 can be further secured. FIG. 7 shows the use of a geotextile fabric 1 on a slope at the edge of a road 30.List of reference numbers:1 Geotextile fabric 2 Warp thread 3 Weft thread 4 Yarn 5 Reinforcing element 8 Separating element 10 Rotating element 20 Embankment 21 Upper end of embankment 22 Lower end of embankment 23 Fastening means 30 Street 40 Plant growth L Longitudinal direction W Angle

Claims

Geotextile fabric (1), in particular for stabilizing an unfixed ground, comprising: a plurality of weft yarns (3) and a plurality of warp yarns (2), and a reinforcing element (5) provided in or on at least one weft yarn (3) and / or in or on at least one warp yarn (2), wherein the weft yarns (3) and the warp yarns (2) comprise natural fibers, wherein the reinforcing element (5) comprises inorganic, mineral and / or metallic material.Geotextile fabric (1) according to claim 1, wherein the geotextile fabric (1) is made free of plastic.Geotextile fabric (1) according to one of the preceding claims, wherein the warp threads (2) and the weft threads (3) are each made as twisted threads made from at least two natural fiber yarns (4) each.Geotextile fabric (1) according to claim 3, wherein at least one reinforcing element (5) is respectively braided or twisted into the twisted threads belonging to the warp threads (2).Geotextile fabric (1) according to claim 3 or 4, wherein at least one, preferably all, of the natural fiber yarns (4) of the weft threads (3) each have a reinforcing element (5) as core.Geotextile fabric (1) according to any of the preceding claims, wherein the natural fibers are coconut fibers or natural fibers from one or more of: kapok, cotton, flax, viscose, hemp, jute, ramie, sisal, manila, stinging, wool, hair, silk(s), cellulose, optionally wherein the mineral material comprises asbestos, glass ceramic and / or basalt.Use of a geotextile fabric (1) according to one of the preceding claims as a geotextile.A method for producing a twist thread for geotextile fabric (1) comprising the following steps: (a) providing two natural fibre yarns (4) and a reinforcing element (5), in particular reinforcing wire; (b) twisting the two natural fibre yarns (4) together and with the reinforcing element (5), wherein during the bringing together the reinforcing element (5) is arranged between the natural fibre yarns (4).Method according to claim 8, wherein the natural fibre yarns (4) are wound around a separating element (8) from two sides and twisted behind the separating element (8), wherein the reinforcing element (5) is wound around the separating element (8) on the same side as a first of the natural fibre yarns (4), wherein the reinforcing element (5) has an angle (W) of 35° to 60° to the first of the natural fibre yarns (4) when being wound together.Method for producing a geotextile fabric (1), in particular for stabilizing an unfixed ground, comprising the following steps: (a) providing first twisted yarns with reinforcing element (5), preferably produced according to any one of claims 8 to 9, as warp yarns (2); (b) providing second twisted yarns as weft yarns (3), wherein the second twisted yarns are produced from at least two natural fibre yarns (4), wherein a reinforcing element (5) is optionally provided as core for the natural fibre yarns (4); (c) weaving the fabric with the warp yarns (2) and the weft yarns (3), preferably according to a plain weave, a cattun weave, a body weave, an atlas weave, a satin weave, a leno fabric or derivatives or combinations of these weaves.

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