Geotextile structure with polypropylene and polyester composite interwoven layer

Abstract

The utility model belongs to the field of geotextile structures, and particularly relates to a geotextile structure with a polypropylene and polyester composite interwoven layer, which comprises a surface layer, a middle layer and a bottom layer which are sequentially laminated and compounded, and a needling combination part vertically penetrating through the surface layer, the middle layer and the bottom layer, the surface layer is a polypropylene short fiber needle-punched non-woven fabric, the middle layer is a woven fabric formed by interweaving polyester filaments and polypropylene flat filaments, and the bottom layer is a polyester short fiber needle-punched non-woven fabric; the needling combination part is a fiber entangled body; the warps of the middle layer are polyester filaments, and the wefts of the middle layer are polypropylene flat filaments; a four-layer redundant design of a comparison scheme is replaced by a three-layer simplified structure and a vertical needling combination part, polyester filament warp yarns and polypropylene flat filament weft yarns in the middle layer are interwoven to form a high-strength water-permeable channel, and meanwhile, a fiber entanglement body of the needling combination part penetrates through three-layer anchoring, so that the problems of pore blockage and layering risks caused by a glass fiber layer are thoroughly solved; the original unification of obdurability and water permeability is realized.

Description

Technical Field

[0001] This utility model relates to the field of geotextile structures, specifically a geotextile structure with a composite interwoven layer of polypropylene and polyester. Background Technology

[0002] With the development of the national economy, the demand for geosynthetic materials in geotechnical engineering construction is increasing, and the requirements for material performance are becoming more stringent, which in turn promotes the development and application of high-strength geotextiles. Woven geosynthetic fabrics are commonly used for filtration, seepage prevention, foundation reinforcement, and soil retention. However, because geotextiles are subjected to pressure loads during use, certain strength requirements also apply.

[0003] In the prior art, such as in publication number CN210062238U, a reinforced breathable geotextile is disclosed, which includes a first warp and a second warp, and a first weft and a second weft. The first warp is polypropylene with a rectangular cross-section, and the first weft is polypropylene with an elliptical cross-section. The second warp is glass filament with a circular cross-section, and the second weft is glass filament with a circular cross-section. A glass fiber layer is laminated on one side of the base fabric layer, and a polyester fiber mesh layer is laminated on the other side of the glass fiber layer. The reinforced breathable geotextile of this utility model uses a geogrid combined with a polypropylene woven fabric, which can improve the strength of the geotextile and has a high effective pore size. The addition of glass fiber and polyester fiber layers improves the geotextile's ability to retain soil, and the presence of air pores in the polyester fiber layer enhances its air permeability.

[0004] Although the aforementioned patents enhance geotextiles by stacking multiple functional layers and increasing strength through glass fiber layers, the excessive complexity of the structure makes mass production difficult, and the glass fiber layers' pore-clogging contradicts the goal of strength improvement. Therefore, a geotextile structure with a composite interwoven layer of polypropylene and polyester is proposed to address the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, such as the difficulty in mass production due to overly complex structures and the contradiction between the glass fiber layer blocking pores and the goal of improving strength, this invention proposes a geotextile structure with a composite interwoven layer of polypropylene and polyester.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: The geotextile structure with polypropylene and polyester composite interwoven layers of this utility model includes a top layer, a middle layer and a bottom layer that are stacked in sequence, and a needle-punched joint that penetrates the top layer, the middle layer and the bottom layer vertically; the top layer is a polypropylene short fiber needle-punched nonwoven fabric, the middle layer is a woven fabric formed by interweaving polyester filaments and polypropylene flat filaments, and the bottom layer is a polyester short fiber needle-punched nonwoven fabric; the needle-punched joint is a fiber entanglement.

[0007] Preferably, the warp yarn of the middle layer is polyester filament and the weft yarn is polypropylene flat yarn, and the warp yarn density is greater than the weft yarn density.

[0008] Preferably, the surface layer and the middle layer are bonded together by a hot rolling process, and the fibers of the needle-punched joint are simultaneously entangled in the woven structure of the middle layer and the non-woven fibers of the bottom layer.

[0009] Preferably, the cross-section of the polypropylene flat filament in the middle layer is rectangular, and the surface of the bottom layer is provided with raised anti-slip texture.

[0010] Preferably, the weight of the surface layer is less than that of the middle layer, and the weight of the bottom layer is greater than that of the surface layer.

[0011] Preferably, the fibers of the needle-punched joint comprise short polypropylene fibers from the outer layer and short polyester fibers from the inner layer.

[0012] The advantages of this utility model are:

[0013] 1. This utility model replaces the four-layer redundant design of the comparative scheme with a three-layer simplified structure and a vertical needle-punched joint. It utilizes the interweaving of polyester filament warp yarn and polypropylene flat yarn weft yarn in the middle layer to form a high-strength water-permeable channel. At the same time, the fiber entanglement of the needle-punched joint penetrates through the three layers for anchoring, completely solving the risk of pore blockage and delamination caused by the glass fiber layer, and achieving the original unity of toughness and water permeability.

[0014] 2. This utility model utilizes the weight gradient distribution of the surface polypropylene nonwoven anti-corrosion layer and the bottom polyester nonwoven anti-slip layer, combined with the stress dispersion characteristics of the middle rectangular flat yarn, to maintain the soil directly through the structure's self-filtration mechanism without the need for additional composite geogrids or perforation repairs, significantly reducing the complexity of mass production and avoiding the risk of anti-slip particles falling off. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the needle-punching joint structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the middle and bottom layer structures of this utility model;

[0019] Figure 4 This is a schematic diagram of the disassembled structure of this utility model.

[0020] In the diagram: 1. Surface layer; 2. Middle layer; 3. Bottom layer; 4. Needle-punching junction. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] Please see Figures 1-4 As shown, the geotextile structure with polypropylene and polyester composite interwoven layers includes a top layer 1, a middle layer 2, and a bottom layer 3 stacked in sequence, and a needle-punched joint 4 that vertically penetrates the top layer 1, the middle layer 2, and the bottom layer 3; the top layer 1 is a polypropylene short fiber needle-punched nonwoven fabric, the middle layer 2 is a woven fabric formed by interweaving polyester filaments and polypropylene flat filaments, and the bottom layer 3 is a polyester short fiber needle-punched nonwoven fabric; the needle-punched joint 4 is a fiber entanglement; the fibers of the needle-punched joint 4 include polypropylene short fibers from the top layer 1 and polyester short fibers from the bottom layer 3.

[0023] During operation, the surface layer 1, formed by needle punching polypropylene short fibers, is placed underneath, and a middle layer 2, formed by interlacing polyester filament warp yarns and polypropylene flat filament weft yarns, is covered on top. Then, a bottom layer 3, made of needle punched polyester short fiber nonwoven fabric, is stacked on top. The surface layer 1 and the middle layer 2 are bonded together by hot rolling process, and then the three layers are vertically penetrated by needle punching process to form a needle punch joint 4. The fiber entanglement of the needle punch joint 4 is anchored in the woven structure of the middle layer 2 and the fibers of the bottom layer 3.

[0024] Furthermore, the warp yarn of the middle layer 2 is polyester filament and the weft yarn is polypropylene flat yarn, and the warp yarn density is greater than the weft yarn density; the weight of the top layer 1 is less than that of the middle layer 2, and the weight of the bottom layer 3 is greater than that of the top layer 1.

[0025] During operation, the polyester warp density of the middle layer 2 is greater than that of the polypropylene flat yarn weft density, forming a longitudinal high-strength permeable channel; the rectangular polypropylene flat yarn maintains the transverse porosity; the bottom layer 3 has raised anti-slip textures on its surface and a weight higher than that of the top layer 1; the entangled fibers of the needle-punched joint 4 connect the polypropylene of the top layer 1 and the polyester of the bottom layer 3, simultaneously achieving anti-delamination, permeable soil filtration and construction anti-slip.

[0026] Furthermore, the warp yarns of the middle layer 2 are polyester filaments, and the weft yarns are polypropylene flat yarns, with the warp yarn density being greater than the weft yarn density.

[0027] During operation, polyester filaments are used as the warp yarns of the middle layer 2, and polypropylene flat yarns are used as the weft yarns. A plain weave loom is used to interweave the warp yarns with a density greater than the weft yarn density. The high-density polyester warp yarns are arranged continuously in the longitudinal direction to form the main load-bearing chain, while the low-density polypropylene flat yarn weft yarns are distributed laterally at intervals, maintaining permeable gaps. The higher warp density of the middle layer 2 increases the longitudinal tensile strength, while the low-density weft yarns maintain the lateral permeability. The polyester filament warp yarns resist the tensile stress of the soil, and the elastic deformation of the polypropylene flat yarn weft yarns buffers the impact, achieving a natural balance between strength and permeability.

[0028] Furthermore, the cross-section of the polypropylene flat yarn in the middle layer 2 is rectangular, and the surface of the bottom layer 3 is provided with raised anti-slip textures.

[0029] During operation, the polypropylene flat yarns of the middle layer 2 are extruded using a rectangular cross-section mold, with their flat surfaces parallel to the geotextile laying surface. Simultaneously, raised anti-slip textures are hot-pressed onto the surface of the polyester nonwoven fabric of the bottom layer 3, with the textures perpendicular to and intersecting the weft yarns of the middle layer 2. The rectangular flat yarns increase the contact area between the middle layer 2 and the surface layer 1 / bottom layer 3, improving the efficiency of interlayer shear force transfer; the raised anti-slip textures increase the frictional resistance between the bottom layer 3 and the soil, and, combined with the anchoring effect of the needle-punched joint 4, eliminate the risk of slippage during construction.

[0030] Working principle: When the polypropylene short fiber nonwoven fabric of the surface layer 1 comes into contact with the external corrosive environment, it forms a chemical barrier. The middle layer 2, which is thermally bonded below, bears the longitudinal tension through the high-density polyester filament warp yarns, while the low-density polypropylene flat filament weft yarns maintain the transverse water permeability channels. The polyester short fiber nonwoven fabric of the bottom layer 3 enhances the frictional anchoring with the soil with its high basis weight and raised texture on the surface. The needle-punched joint 4, which runs vertically through the three-layer structure, entangles the polypropylene fibers of the surface layer 1 and the polyester fibers of the bottom layer 3 and anchors them into the woven mesh of the middle layer 2, forming a mechanical locking and anti-delamination, ultimately achieving the synergistic function of anti-corrosion, toughness, water permeability and anti-slip.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or similar improvements made within the theoretical and principle content of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A geotextile structure with a polypropylene and polyester composite interwoven layer, characterized by: It includes a top layer (1), a middle layer (2) and a bottom layer (3) that are stacked in sequence, and a needle-punched joint (4) that penetrates the top layer (1), the middle layer (2) and the bottom layer (3) vertically; the top layer (1) is a polypropylene short fiber needle-punched nonwoven fabric, the middle layer (2) is a woven fabric formed by interlacing polyester filaments and polypropylene flat filaments, and the bottom layer (3) is a polyester short fiber needle-punched nonwoven fabric; the needle-punched joint (4) is a fiber entanglement.

2. The geotextile structure with polypropylene and polyester composite interwoven layers according to claim 1, characterized in that: The warp yarn of the middle layer (2) is polyester filament and the weft yarn is polypropylene flat yarn, and the warp yarn density is greater than the weft yarn density.

3. The geotextile structure with polypropylene and polyester composite interwoven layers according to claim 1, characterized in that: The outer layer (1) and the middle layer (2) are bonded together by a hot rolling process, and the fibers of the needle-punched joint (4) are simultaneously entangled in the braided structure of the middle layer (2) and the non-woven fibers of the bottom layer (3).

4. The geotextile structure with polypropylene and polyester composite interwoven layers according to claim 1, characterized in that: The cross-section of the polypropylene flat yarn in the middle layer (2) is rectangular, and the surface of the bottom layer (3) is provided with raised anti-slip texture.

5. The geotextile structure with polypropylene and polyester composite interwoven layers according to claim 1, characterized in that: The weight of the top layer (1) is less than that of the middle layer (2), and the weight of the bottom layer (3) is greater than that of the top layer (1).

6. The geotextile structure with polypropylene and polyester composite interwoven layers according to claim 1, characterized in that: The fibers of the needle-punched joint (4) comprise polypropylene short fibers from the surface layer (1) and polyester short fibers from the bottom layer (3).

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