CS195027B1 - Needle-punched fabric for reinforcing building elements - Google Patents

Description

The invention relates to textiles intended to reinforce a building in the construction of foundations of roads, roads, waterworks and substructures. The fabric is formed from basic synthetic fibers preferably having a shear length of 40 to 80 mm, interconnected by a set of fiber bundles at a frequency of approximately half that of the maximum attainable strength. The formation is interspersed with a system of threads forming a skeleton of mutually overlapping loops. Alternatively, the entire formation may be reinforced by a plurality of longitudinally guided threads or tapes cut from a polymeric film and refined by precipitating a proportion of admixed high-shrinkage fibers.

It is known that to improve the efficiency of construction work, especially in the construction of utilities, roads, roads, hydraulic structures and foundations of demanding buildings, it is well-used as an intermediate layer of backfill building materials, eg gravel, sand, clay, auxiliary textiles. is complicated. In addition to the uniform pressure distribution of the feed layer, it must ensure water penetration and act as a filter layer for fine clay particles without causing blockage of pores and impairment of function. All this auxiliary textile layer must ensure, in addition to the maximum ability to absorb water, resistance to the effects of chemical pollutants in the soil, including microbiological effects.

Fabrics and common types of nonwovens do not meet these main functional requirements. On the other hand, the use of nonwovens made directly from radii has proved to be useful

195 027

195 027 in a manner known as spun-bonded or spun-bonded production. This production is economically advantageous, leads to a functionally satisfactory product, but it causes some confusion in considering the raw material situation, investment costs and does not allow the manufacture of textiles to a greater extent. It is also not possible to ensure uniformity over the entire surface to prevent bridge disturbances of the filter function. It requires a pure polymer which can be processed into commercial fibers for a common need in the textile industry by a very related process. The use of inferior raw materials, especially regenerated, is not an option.

So far, only the construction of a fabric made of filaments forming a fleece directly below the nozzle has resulted in the necessary properties of deformation, strength, relatively high ductility and bulkiness important in terms of filtering ability and soaking up the required volume of water.

The fabrics produced for this purpose according to the invention not only allow their construction to satisfy all the functional requirements, but also allow the processing of regenerated cloth materials including inferior waste, as well as cut polymeric tape tapes, whose application against fibers is least economically advantageous. The structure of the fabric to achieve the desired properties is that the substantially fibrous web is interleaved by a skeleton formed from a web of continuous filament loops, either in layers corresponding to the individual webs in the layered web or as a continuous interlayer. In some cases of application where there is a particular requirement for high longitudinal strength, the fabric further comprises a plurality of longitudinally disposed yarns of optional pitch. Concerning the production of these fabrics, it is possible on a common type of needling lines supplemented with a device for laying a filament of continuous filaments or laying a set of warp threads. The fabrication of these fabrics is possible in both 8 and 12 m widths, whilst the production under the nozzle is limited to 3 m widths.

Examples

Example 1.

The fabric intended to reinforce the road base or rail substructure has an overall basis weight of 400 g / m. The basic tows consist of a mixture of 50% polypropylene fibers obtained from fibrillated foils on the converter and 50% polypropylene staple with a fineness of 8.9 dtex and a length of 60 mm. the structure is uniformly interspersed throughout the section by a set of loops of polypropylene silk with a fineness of 289 dtex with a longitudinal axis length of 50 mm.

The formation is interconnected by bundles of 20 to 40 fibers with a frequency of 80 to 100 per cm ^{2 by} needling on a needle needling machine.

Example 2

The fabric intended for the construction of a drainage net has a total basis weight of 300 g / cm ² . It consists of a mixture of waste polyester fibers with a proportion of 30% polypropylene fibers, highly shrinkage. As in Example 1, the formation is interleaved with a set of loops except that they are embedded in the fabric web in the middle and reinforced on one side by a set of longitudinally guided threads alternatively made of polypropylene split strips or cut polypropylene film strips at 8 mm. Due to the shrinkage of the shrinkage slice

The 19S 027 fiber has acquired the high volume and more ductility needed to compensate for the unevenness of the drainage filler.

Example 3

Textiles intended for strengthening and at the same time thermal insulation of concrete structures for

2The frost damage prevention is formed from a mixture of waste synthetic fibers, e.g.

POP, PAD, PES, total weight 1000 g / m. Similar to Example 1, the fiber is reinforced by a set of loops formed from cut POP strips with a longitudinal axis length of about 200 mm. The formation is interconnected with fiber bundles at a density of 60 stitches per cm @ -1. In use, the fabric replaces the much more demanding thermal insulation used to date for concrete structures.

Claims (5)

A needled fabric for reinforcing a construction work in the construction of foundations of roads, roads, waterworks and structures, characterized in that it consists of basic synthetic fibers, oriented mostly horizontally and accompanied by predominantly vertically extending bundles of fibers, interspersed with a system of threads in the form of loops, possibly also by a set of threads guided longitudinally. 2. Needled fabrics according to claim 1, characterized in that the loops made of threads interleave the entire formation in layers corresponding to the thickness of the web in the layered web. 3-Textile according to items 1 and 2, characterized in that the interconnection frequency of the fiber bundles is in the region of up to 50% of the number of stitches otherwise required to achieve maximum tensile strength. 4. The needled fabric of claim 1, wherein the set of loops interspersed with the fabric is formed of silk or a strand of continuous filaments composed of at least 2ÓÓ monofilů. 5. The needled fabric of claim 1, wherein the set of loops interlaced with the fabric is formed from monofilaments of 200 tex fineness.