CS206496B1 - Needle-punched geotextile fabric - Google Patents

Description

(54) Spotted geotextile

BACKGROUND OF THE INVENTION The present invention relates to an embedded geotextile suitable for use in particular in the construction of eest, railways and various hydro-fire structures, and consisting of a reinforcing fabric to which at least one side a fibrous web is attached to the spiral.

In the construction of roads, railways and some hydrotechnical constructions, it is still better to use felt, so-called geotextiles. The installation of geotextile under and into the embankment of roads, railroads and other construction objects carried out on unbearable soils will in particular shorten the construction time, reduce the volume of spilled material and increase the stability of the embankment or the object at minimum maintenance costs.

For geotextiles in particular, two essential properties are required: the separation ability and the reinforcement ability. Separation of abilities prevents geotextiles from contamination of the overburden of high-quality embankment layers of the ground structure with fine-grained parts of soil from unbearable or lower-quality subsoil. Geotextile reinforcement increases the load-bearing capacity of the ground structure and reduces the bending tensile stress. The best bonding and filtering properties are achieved by the nonwoven fabric, while the fabrics are suitable for tensile reinforcement. The good separation effect of the nonwoven fabric depends both on the roughness of the fibers and on the thickness of the fabric which is at least one millimeter. Excessive thickness of the geotextile only slightly improves its utility properties and is therefore uneconomical. In contrast, excessively thin nonwoven fabrics slightly resist tensile stress. For these reasons, known geotextiles have been produced, which are a combination of nonwoven fabrics with a fabric that transmits tensile stress

206 496 '. The fibrous web and the reinforcing fabric are of synthetic fiber material, in particular of polyester or polypropylene. These known geotextiles are therefore very strong, but during their use in the construction of eest ee have shown their disadvantage: elongation, which is a common property of most synthetic fibers. The ductility of a geotextile partially diminishes its reinforcing ability, which is, however, a necessary property in these textiles. Just mentioned serious disadvantage *. It can be changed by using thick threads to reinforce the fabric, but this in turn increases the material costs disproportionately and, in particular, during manufacturing, creates a manufacturing problem.

The above mentioned disadvantages are eliminated by needlepunched geotextiles suitable for use in the construction of oost, iron and various hydrotechnical structures and consisting of a reinforcing fabric, at least one side of which is covered by a fiber fleece and is based on the invention in that the reinforcing fabric is woven from the inclined yarns and the fibrous web comprise synthetic fibers at least in a mixture. The glass threads consist of staple fibers or filaments. The fibrous composition of the web may be different. In one embodiment of the geotextile, the fibrous web is formed from a single strand of synthetic fibers, in particular polypropylene fibers. In another embodiment, the web consists of a mixture of synthetic fibers, in particular a mixture of polyester and polyamide fibers. In another embodiment, the fibrous web is formed from a mixture of synthetic fibers with natural fibers. It is also possible that the fiber web on one side of the fabric reinforcement differs from the fiber web on the other side of the fabric reinforcement, e.g. one fiber web is a synthetic web formed under the nozzle and the other fiber web is a blend of staple fibers consisting of one component fibers, especially polypropylene, and bicomponent fibers, especially polypropylene / polyethylene. The non-woven synthetic fibers may comprise a smaller proportion of fibers having a lower melting point than the larger melting point of the fibers, e.g. the polyester fibers are polyamide fibers or polyethylene fibers alongside the polypropylene fibers. Finally, in one possible embodiment, the geotextile is a reinforcing fabric. fiber web, which are joined together by some web fibers extending through a portion of their lengths through the thickness of the fabric, reinforced and reinforced with at least a substantially melted fraction of lower melting point synthetics.

The expanded geotextile according to the invention exhibits a markedly improved elongation resistance and its strength is suitable for its use. The glass reinforcing fabric is completely stable in the soil environment and is more laolier than the synthetics fabric. The three-layer design of the geotextile, which is the most common variant, eliminates the less suitable hygienic properties of the glass fabric, since the glass is hidden between the outer fiber webs.

The advantages of the invention stand out better from the description of examples of embedded geotextiles.

Example 1

Λ

Aagor glass fabric of the commercial designation RAN weighing 200 g / m is placed. A fiber web of 250 g / m < 2 > formed of conventional polypropylene fibers of two different fines and lengths: 50 wt. % fibers with a fineness of 6.6 dtex and a length of 60 mm and 50 wt. % fibers with a fineness of 17 dtex and a length of 90 mm.

The two-layer formation thus prepared is combined and consolidated on the injection molding machine 2 by a fleece side with an intensity of 40 to 120 v / s using a 15 x 18 x 32 x 3.5 O MOT felting needle.

This vpiohovaai gootoxtili is suitable for use in the construction of railway superstructures.

Example 2

Two nonwoven fabrics are prepared from the emission of polyester and polyamide waste fibers, each having a weight of 150 g / m < 3 >

This three-layered structure is initially injected with an intensity of 70 vpiohms / om ² < r &^gt; on one side and then with the same number of vpiohos from the other side. The embossing is performed with felt needles 15 x 18 x 36 x 3.5 BB ΝΚϋ super speoial.

The product is particularly suitable for use in the construction of agricultural estates.

Example 3

The process of manufacturing vpiohovaaá gootextllio so liéí from Example. 2 only by using one or two fibrous webs prepared from a mixture containing 80 to 50 wt. % synthetic fibers and 20 to 50 wt. % natural organic fibers, eg cotton. In the case of a single nonwoven, only one side of the nonwoven is applied, whereas in the case of two nonwoven, it is applied as in Example 2.

This vpiohovaaá geotextile and is especially suitable for use, for example, in strengthening the shores of birthdays, etc., and who requires a constant sense of excess science.

EXAMPLE 4a A 200 g / m ² polypropylene fiber web produced under a nozzle is laid with a glass fabric RK0 of 480 g / m ² . On the far side of this glass fabric, a fiber having 200 g / m @ ² is formed, consisting of a fiber blend consisting of 40 to 70 wt.% Coarse staple fibers and polypropylene fibers and 60 to 3 wt. % of two-component palprojylene / polyotyl fiber.

This three-layered structure is joined and stiffened by stitching on the side of the staple fiber web with an intensity of 70 to 150 inches of submersible felting needles 15 x 18 x 36 x 3.5 HB NKU super speoial with two barbs at two edges. The thermoformed body is thermally treated at a temperature of 120 to 150 ° C by passing through a drum machine to dissolve the polyethylene in the bicomponent fiber, thereby bonding the other fibers in the fabric with molten polyethylene.

The spiked geotextile thus produced exhibits increased stiffness, so that it is particularly suitable for use in the construction of heavy-duty buildings such as highways and airfields.

Claims (6)

BδB 9 Μ 8 X HIGH ΖΠ \ 1. Surface geotextile suitable especially for use. in the construction of rails, railways and various hydro-fire structures and reinforcement fabrics, to which at least one side a spunbonded web is attached to the embedding and fastened, characterized in that the reinforcing web is woven from green yarns and the fibrous web comprises at least a blend. 2. The geotextile according to claim 1, characterized in that the glass threads consist of staple fibers or filaments. The spun geotextile according to the run 1, of one kind of synthetic fiber, is characterized in that the fibrous web is preferably made of polypropylene. The embedded geotextile according to claim 1, characterized in that the fibrous web consists of a mixture of synthetic fibers, in particular a mixture of polyester and polyamide fibers. 5. The spiked geetentilia according to claim 1, characterized in that the fibrous web is formed from a mixture of synthetic fibers with natural organic fibers. 6. The spun geotextile according to claim 1, characterized in that the fibrous web on one side of the fabric reinforcement differs from the fibrous web on the other side of the fabric reinforcement by material composition and / or weight, e.g. the fiber web is a blend of staple fibers, consisting of one-component fibers, in particular polypropylene fibers, and two-component fibers; fibers, in particular polyprojylene / polyethylene. 7. The spiked geotextile of claim 1, wherein said nonwoven forming fibers comprise a lower fraction of fibers with a lower melting point than a larger fraction of said fibers, e.g., a lower proportion of polyamide fibers besides polyester fibers, or polypropylene fibers are fibers. polyethylene. 8. The geotextile of claim 1, wherein the reinforcing fabric and the fibrous web joined together by some of the web fibers extending over a portion of their length through the geotextile are reinforced and reinforced with at least a partial molten fraction of synthetics with lower melting points. .