Geotechnical cloth with multi-layer structure

Abstract

The utility model relates to a multi-layer structure geotextile, which comprises a first reinforcing layer, a first impermeable layer, a middle composite layer, a second impermeable layer, a second reinforcing layer and a bottom protective layer which are firmly combined from top to bottom, and the first reinforcing layer and the second reinforcing layer are formed by weaving high-strength polyester fibers or glass fibers. The first impermeable layer and the second impermeable layer are high-density polyethylene films, the middle composite layer is formed by bonding two or more layers of polypropylene non-woven fabrics, and the bottom protective layer is a modified polypropylene non-woven fabric. The geotextile with the multi-layer structure not only solves the limitation of the traditional single-layer geotextile in the aspects of strength, impermeability, durability, adaptability to complex geological conditions and the like, but also provides powerful support for the safety, high efficiency and sustainable development of engineering; the wide application of the device is helpful for improving the engineering quality, reducing the maintenance cost, prolonging the service life and promoting the continuous progress and innovative development of the civil engineering technology.

Description

Technical Field

[0001] The utility model relates to the technical field of geotextiles, and particularly relates to a multi-layer structure geotextile. Background Art

[0002] In the rapidly developing modern civil engineering construction, as an important engineering material, the performance of geotextiles is directly related to the safety, durability and economy of the project. Although traditional single-layer geotextiles can meet the basic engineering requirements to a certain extent, with the continuous expansion of the project scale and the increase in complexity, their limitations have gradually emerged. Single-layer geotextiles often fail to meet the high standards of modern projects in terms of strength, impermeability, durability, and the ability to adapt to complex geological conditions.

[0003] Specifically, when facing environmental conditions such as high-intensity stretching, long-term water immersion, ultraviolet radiation, and extreme temperatures, single-layer geotextiles are prone to problems such as damage, aging, and water seepage, thus affecting the overall performance and service life of the project. In addition, for projects that need to bear large pressures, require high impermeability grades, or need to adapt to complex geological changes, the performance of single-layer geotextiles is even more difficult to meet the requirements.

[0004] Based on the above background, the utility model proposes a multi-layer structure geotextile, aiming to create a new type of geotextile with excellent performance, strong adaptability, and wide application through innovative design and material selection, providing strong guarantee for the safe, efficient, and sustainable development of modern civil engineering. Summary of the Utility Model

[0005] In order to solve the above problems, the utility model provides a multi-layer structure geotextile. This multi-layer structure geotextile not only solves the limitations of traditional single-layer geotextiles in terms of strength, impermeability, durability, and adaptation to complex geological conditions, but also provides strong support for the safety, efficiency, and sustainable development of the project; its wide application will help improve the project quality, reduce maintenance costs, extend the service life, and promote the continuous progress and innovative development of civil engineering technology.

[0006] The technical solution of the utility model is as follows:

[0007] A multi-layer structure geotextile includes a first reinforcement layer, a first impermeable layer, an intermediate composite layer, a second impermeable layer, a second reinforcement layer, and a bottom protection layer that are firmly combined from top to bottom. The first reinforcement layer and the second reinforcement layer are woven from high-strength polyester fibers or glass fibers. The first impermeable layer and the second impermeable layer are high-density polyethylene films. The intermediate composite layer is formed by bonding two or more layers of polypropylene non-woven fabrics. The bottom protection layer is a modified polypropylene non-woven fabric.

[0008] The fiber diameters of the first reinforcement layer and the second reinforcement layer are 0.2 mm to 0.5 mm, and the warp and weft densities are not less than 80×80 threads / 10 cm. 2 .

[0009] The thicknesses of the first reinforcement layer and the second reinforcement layer are 0.3 mm to 0.8 mm.

[0010] The thicknesses of the first anti-seepage layer and the second anti-seepage layer are 0.1 mm to 0.5 mm.

[0011] The thickness of the middle composite layer is 1 mm to 2 mm.

[0012] The thickness of the bottom protection layer is 0.8 mm to 1.5 mm.

[0013] An additional layer is further provided above the first reinforcement layer, and the additional layer is a wear-resistant layer or an anti-ultraviolet layer or a flame-retardant layer or a conductive layer or an antibacterial layer.

[0014] The additional layer is firmly bonded to the first reinforcement layer through an adhesive.

[0015] The adhesive is a hot melt adhesive or a hot melt pressure-sensitive adhesive.

[0016] Each layer of the multi-layer structured geotextile is firmly bonded through hot melt pressing or ultrasonic welding or chemical crosslinking.

[0017] The beneficial effects of the present utility model are as follows:

[0018] 1. A multi-layer structured geotextile disclosed by the present utility model significantly improves strength and durability: By adopting a reinforcement layer woven from high-strength polyester fibers or glass fibers and strictly controlling its fiber diameter and warp and weft densities, the multi-layer structured geotextile has achieved a qualitative leap in strength. This enables it to maintain stable performance under harsh environments such as high-strength stretching, long-term water immersion, and extreme temperatures, effectively avoiding engineering safety problems caused by material damage or aging.

[0019] 2. A multi-layer structured geotextile disclosed by the present utility model has excellent anti-seepage performance: By introducing a high-density polyethylene film as the anti-seepage layer, the anti-seepage ability of the geotextile is greatly improved. This material not only has excellent anti-seepage performance but also can effectively resist the erosion of chemical substances, ensuring that the soil and groundwater are not polluted, providing a reliable guarantee for the long-term stable operation of the project.

[0020] 3. A multi-layer geotextile disclosed by the present utility model, which has enhanced filtration and drainage functions: the design of the middle composite layer enables the multi-layer geotextile to promote water circulation and reduce hydrostatic pressure while maintaining the stability of the soil structure. This is of great significance for improving the overall stability of the engineering structure and preventing various engineering problems caused by water accumulation.

[0021] 4. A multi-layer geotextile disclosed by the present utility model, which can be customized according to different engineering requirements by setting additional layers such as wear-resistant layer, anti-ultraviolet layer, flame-retardant layer, conductive layer or antibacterial layer above the first reinforcement layer, meeting diverse usage scenarios. This flexibility not only expands the application scope of the geotextile but also further enhances its practicality and economy in actual engineering.

[0022] 5. A multi-layer geotextile disclosed by the present utility model, which firmly combines each layer by using advanced processes such as hot melt pressing, ultrasonic welding or chemical cross-linking, ensuring the stability and reliability of the multi-layer geotextile under complex geological conditions. Brief Description of the Drawings

[0023] By reading the detailed description of the preferred embodiments below, the solutions and advantages of the present application will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model.

[0024] In the drawings:

[0025] Figure 1 is a schematic structural diagram of a multi-layer geotextile according to Embodiment 1 of the present utility model;

[0026] Figure 2 is a schematic structural diagram of a multi-layer geotextile according to Embodiment 2 of the present utility model;

[0027] The components represented by each reference numeral in the drawings are:

[0028] The present utility model: 1. First reinforcement layer, 2. First anti-seepage layer, 3. Middle composite layer, 4. Second anti-seepage layer, 5. Second reinforcement layer, 6. Bottom protection layer, 7. Additional layer. Detailed Description of the Embodiments

[0029] In the field of modern civil engineering construction, with the continuous expansion of project scale and the increase in complexity, the performance requirements for geotextiles are also rising day by day. Traditional single-layer geotextiles are increasingly unable to meet the high standards of modern projects in terms of strength, impermeability, durability, and adaptability to complex geological conditions. Therefore, a new type of multi-layer structured geotextile has emerged. Through innovative design and precise material selection, it provides strong guarantees for the safe, efficient, and sustainable development of projects.

[0030] Example 1

[0031] As Figure 1 shown, the multi-layer structured geotextile is firmly bonded together in six main structures from top to bottom, namely the first reinforcement layer 1, the first impermeable layer 2, the intermediate composite layer 3, the second impermeable layer 4, the second reinforcement layer 5, and the bottom protection layer 6. Each layer is tightly connected to ensure the stability and reliability of the overall structure.

[0032] First reinforcement layer 1: 1. Material selection: The first reinforcement layer 1 is woven from high-strength polyester fibers or glass fibers. Both of these materials have high tensile strength and good wear resistance, and can effectively resist the erosion and damage of the external environment; 2. Fiber diameter and warp and weft density: The fiber diameter is controlled between 0.2 mm and 0.5 mm to ensure the fineness and strength of the fibers. The warp and weft density is not less than 80×80 per 10 cm 2 , further enhancing the overall strength and stability of the reinforcement layer; 3. Thickness: The thickness is 0.3 mm to 0.8 mm, which not only ensures sufficient strength but also avoids material waste and increased processing difficulty caused by excessive thickness; 4. Function: As the top layer of the multi-layer structured geotextile, the first reinforcement layer 1 mainly undertakes the task of resisting external tensile forces and abrasion, protecting the internal layers from damage.

[0033] First impermeable layer 2: 1. Material selection: The first impermeable layer 2 is made of high-density polyethylene film. This material has excellent impermeability and chemical stability, and can effectively prevent the penetration of moisture and chemical substances; 2. Thickness: The thickness is 0.1 mm to 0.5 mm, which while ensuring impermeability performance, also tries to reduce the overall weight and cost as much as possible; 3. Function: As the first impermeable barrier, the first impermeable layer 2 can effectively prevent moisture and harmful substances from invading the soil and groundwater layers, protecting the safety of the project structure and the surrounding environment.

[0034] Intermediate composite layer 3: 1. Material selection: The intermediate composite layer 3 is composed of two or more layers of polypropylene non-woven fabric bonded together. Polypropylene non-woven fabric has good filtration and drainage properties, which can maintain the stability of the soil structure and promote water circulation; 2. Thickness: The thickness is 1 mm to 2 mm, ensuring sufficient filtration and drainage effects while maintaining the compactness of the overall structure; 3. Function: The intermediate composite layer 3 plays a connecting role in the multi-layer geotextile structure. It can not only protect the underlying anti-seepage layer from being blocked by soil particles but also guide the smooth discharge of excess water, improving the overall stability of the engineering structure.

[0035] Second anti-seepage layer 4: 1. Material selection and thickness: Similar to the first anti-seepage layer 2, the second anti-seepage layer 4 is also made of high-density polyethylene film with a thickness of 0.1 mm to 0.5 mm; 2. Function: As the second anti-seepage barrier, the second anti-seepage layer 4 further enhances the anti-seepage performance of the geotextile, ensuring good anti-seepage effects even under extreme conditions.

[0036] Second reinforcement layer 5: 1. Material selection, fiber diameter, warp and weft density, and thickness: Similar to the first reinforcement layer 1, the second reinforcement layer 5 is also woven from high-strength polyester fiber or fiberglass, with a fiber diameter of 0.2 mm to 0.5 mm and a warp and weft density of not less than 80×80 per 10 cm 2 , and a thickness of 0.3 mm to 0.8 mm; 2. Function: As the bottom reinforcement layer of the multi-layer geotextile structure, the second reinforcement layer 5 mainly bears the role of supporting and stabilizing the overall structure, preventing deformation and damage caused by underlying pressure or geological changes.

[0037] Bottom protection layer 6:

[0038] 1. Material selection: The bottom protection layer 6 is made of modified polypropylene non-woven fabric. On the basis of maintaining the original excellent properties, the modified polypropylene non-woven fabric further improves the wear resistance, corrosion resistance, and anti-aging performance; 2. Thickness: The thickness is 0.8 mm to 1.5 mm, providing a solid protection barrier for the overall structure; 3. Function: The bottom protection layer 6 is in direct contact with the soil or base layer, which can effectively prevent the erosion and damage of soil particles to the internal layers and improve the overall durability of the geotextile.

[0039] The layers of the multi-layer geotextile are firmly bonded through advanced methods such as hot melt pressing, ultrasonic welding, or chemical cross-linking. These bonding techniques have their own characteristics and can select appropriate bonding methods according to the properties of different layer materials and engineering requirements.

[0040] Hot melt pressing: Hot melt pressing is a commonly used interlayer bonding technique. It uses high temperature and pressure to melt the hot melt adhesive and penetrate it into the surfaces and interiors of each layer of materials, forming a tight bonding layer. This bonding method has the advantages of high bonding strength, good water resistance, strong aging resistance, etc., and is particularly suitable for the bonding of materials such as polyester fiber, glass fiber, and high-density polyethylene film.

[0041] Ultrasonic welding: Ultrasonic welding is a technique that uses the energy generated by high-frequency vibration to weld materials together. During ultrasonic welding, the high-frequency vibration causes local high temperature and high pressure on the material surface, thereby melting the materials and making them penetrate each other. This bonding method has the advantages of fast speed, high efficiency, and no pollution, and is particularly suitable for the bonding of materials such as polypropylene non-woven fabric.

[0042] Chemical crosslinking: Chemical crosslinking is a technique that forms chemical bond connections between material molecules through chemical reactions. In the production of multi-layer geotextiles, chemical reactions can occur between each layer of materials by adding crosslinking agents or initiators, etc., to form a stable crosslinked structure. This bonding method has the advantages of extremely high bonding strength, good weather resistance, and not easy to age, but the process is relatively complex and the cost is relatively high.

[0043] Example 2

[0044] As Figure 2 shown, an optional additional layer 7 is also provided above the first reinforcement layer 1 to meet specific engineering requirements.

[0045] Additional layer 7: 1. Material selection and function: The additional layer 7 can be set as a wear-resistant layer, an anti-ultraviolet layer, a flame-retardant layer, a conductive layer, or an antibacterial layer, etc., according to specific engineering requirements. These additional layers are given additional functional characteristics to the geotextile through specific material and process treatments to meet special requirements in different engineering environments; 2. Bonding method: The additional layer 7 is firmly bonded to the first reinforcement layer 1 through an adhesive. This bonding method ensures a tight connection between the additional layer and the main structure, preventing delamination or peeling during use. The adhesives selected are usually hot melt adhesives or hot melt pressure-sensitive adhesives, and these two adhesives have excellent adhesion, high temperature resistance, and aging resistance, and can maintain a stable bonding effect in various complex environments.

[0046] Wear-resistant layer: The wear-resistant layer is mainly made of synthetic fibers with high wear resistance, such as high-strength polyester fibers, nylon fibers, ceramic particle-reinforced composites, polyurethane, etc. These materials have excellent anti-wear performance and can resist mechanical wear, friction, and tearing. The thickness of the wear-resistant layer is usually between 0.1 mm and 2 mm, depending on the application requirements and the overall design of the geotextile. For example, in cases where extremely high wear resistance is required, the thickness of the wear-resistant layer may reach 2 mm or more. The wear-resistant layer can be manufactured by various methods, including but not limited to: Fiber weaving: Weaving wear-resistant fibers into a mesh structure and then laminating it with other layers; Coating technology: Coating a wear-resistant coating, such as a polyurethane coating, on the surface of the substrate to increase wear resistance; Composite technology: Combining wear-resistant particles or fibers with the substrate to form a wear-resistant layer.

[0047] UV-resistant layer: The UV-resistant layer is usually achieved by adding UV absorbers or reflectors to the substrate. These additives can be chemically synthesized UV stabilizers or pigments or dyes with UV-resistant properties. The substrate can be synthetic fiber materials such as polyester fibers and polypropylene fibers. During the manufacturing process of the UV-resistant layer, the UV absorber or reflector is evenly added to the substrate to ensure its uniform distribution throughout the layer. This can be achieved by methods such as chemical modification, co-blending extrusion, or coating technology.

[0048] Flame-retardant layer: The flame-retardant layer is made of flame-retardant fibers or fibers treated with flame retardants. Flame-retardant fibers can be flame-retardant polyester fibers, flame-retardant nylon fibers, glass fibers, etc. A flame retardant is a chemical substance that can inhibit or delay the combustion of materials. The flame-retardant layer can be manufactured by the following methods: Co-blending spinning: Blending the flame retardant with the polymer raw material and then spinning to make flame-retardant fibers; Post-treatment: Treating ordinary fibers with a flame retardant to endow them with flame-retardant properties; Laminating and compounding: Combining flame-retardant fibers or fibers treated with flame retardants with the substrate to form a flame-retardant layer.

[0049] The conductive layer is mainly made of conductive fibers or conductive materials. Conductive fibers can be metal fibers (such as stainless steel fibers, copper fibers), carbon fibers, or conductive polymer fibers, etc. Conductive materials can also be conductive coatings or conductive films.

[0050] The antibacterial layer is mainly composed of an antibacterial agent and a substrate. The antibacterial agent can be an organic antibacterial agent, an inorganic antibacterial agent, or a natural antibacterial agent, etc. The substrate can be synthetic fiber materials such as polyester fibers and polypropylene fibers.

[0051] During the operation, first, the additional layer 7 needs to be cut according to the predetermined size and shape, and its surface should be ensured clean and dust-free. Then, a layer of hot melt adhesive or hot melt pressure-sensitive adhesive is evenly applied on the contact surface between the additional layer and the first reinforcement layer. Next, the two are heated and pressed by a hot pressing device, so that the binder melts and penetrates into the tiny pores of the fiber or film, forming a strong intermolecular bonding force. Finally, after the binder is completely cured, the additional layer is firmly bonded to the first reinforcement layer.

[0052] Example 3

[0053] The multi-layer structure geotextile includes a first reinforcement layer 1, a first anti-seepage layer 2, an intermediate composite layer 3, a second anti-seepage layer 4, a second reinforcement layer 5 and a bottom protection layer 6 that are firmly bonded from top to bottom. The first reinforcement layer 1 and the second reinforcement layer 5 are woven from high-strength polyester fibers or glass fibers. The first anti-seepage layer 2 and the second anti-seepage layer 4 are high-density polyethylene films. The intermediate composite layer 3 is formed by bonding two or more layers of polypropylene non-woven fabrics. The bottom protection layer 6 is a modified polypropylene non-woven fabric.

[0054] The fiber diameter of the first reinforcement layer 1 and the second reinforcement layer 5 is 0.2 mm to 0.5 mm, and the warp and weft density is not less than 80×80 per 10 cm 2 。

[0055] The thickness of the first reinforcement layer 1 and the second reinforcement layer 5 is 0.3 mm to 0.8 mm.

[0056] The thickness of the first anti-seepage layer 2 and the second anti-seepage layer 4 is 0.1 mm to 0.5 mm.

[0057] The thickness of the intermediate composite layer 3 is 1 mm to 2 mm.

[0058] The thickness of the bottom protection layer 6 is 0.8 mm to 1.5 mm.

[0059] An additional layer 7 is also provided above the first reinforcement layer 1. The additional layer 7 is a wear-resistant layer or an anti-ultraviolet layer or a flame-retardant layer or a conductive layer or an antibacterial layer.

[0060] The additional layer 7 is firmly bonded to the first reinforcement layer 1 through a binder.

[0061] The binder is a hot melt adhesive or a hot melt pressure-sensitive adhesive.

[0062] The layers of the multi-layer structure geotextile are firmly bonded by hot melt pressing or ultrasonic welding or chemical cross-linking.

Claims

1. A multi-layer geotextile, characterized in that, It includes a first reinforcing layer (1), a first anti-seepage layer (2), an intermediate composite layer (3), a second anti-seepage layer (4), a second reinforcing layer (5) and a bottom protective layer (6) which are firmly bonded from top to bottom. The first reinforcing layer (1) and the second reinforcing layer (5) are woven from high-strength polyester fibers or glass fibers. The first anti-seepage layer (2) and the second anti-seepage layer (4) are high-density polyethylene films. The intermediate composite layer (3) is formed by bonding two or more layers of polypropylene non-woven fabrics. The bottom protective layer (6) is a modified polypropylene non-woven fabric.

2. The multi-layer geotextile according to claim 1, characterized in that, The fiber diameters of the first reinforcing layer (1) and the second reinforcing layer (5) are 0.2 mm to 0.5 mm, and the warp and weft densities are not less than 80×80 per 10 cm 2 .

3. The multi-layer geotextile according to claim 2, characterized in that, The thickness of the first reinforcing layer (1) and the second reinforcing layer (5) is from 0.3 mm to 0.8 mm.

4. A multi-layer geotextile according to claim 1, characterized in that, The thickness of the first anti-seepage layer (2) and the second anti-seepage layer (4) is from 0.1 mm to 0.5 mm.

5. A multi-layer geotextile according to claim 1, characterized in that, The thickness of the intermediate composite layer (3) is from 1 mm to 2 mm.

6. The multi-layer geotextile according to claim 1, characterized in that, The thickness of the bottom protective layer (6) is from 0.8 mm to 1.5 mm.

7. A multi-layer geotextile according to claim 1, characterized in that, An additional layer (7) is further provided above the first reinforcing layer (1). The additional layer (7) is a wear-resistant layer or an anti-ultraviolet layer or a flame-retardant layer or a conductive layer or an antibacterial layer.

8. A multi-layered geotextile according to claim 7, characterized in that, The additional layer (7) is firmly bonded to the first reinforcing layer (1) through an adhesive.

9. A multi-layered geotextile according to claim 8, characterized in that, The adhesive is a hot melt adhesive or a hot melt pressure-sensitive adhesive.

10. A multi-layer geotextile according to claim 1, characterized in that, Each layer of the multi-layer structured geotextile is firmly bonded by hot melt pressing or ultrasonic welding or chemical cross-linking.

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