A multi-layered composite geotextile

Abstract

The utility model discloses a kind of multi-layer composite geotextile, the composite geotextile is sequentially arranged from bottom to top by a plurality of needle-punched geotextile and a plurality of reinforced layer alternately stacked composition;The reinforced layer includes a plurality of warp and a plurality of weft arranged with same distance to warp and weft cross, in the mode of up and down superposition, mutually cross to form a plurality of well-shaped square;Wherein, the center aperture of each well-shaped square is uniform and size is consistent.The utility model has reasonable structure, and reinforced layer retains enough, uniform aperture, so that product has excellent water permeability and reverse filtration function.

Description

Technical Field

[0001] This utility model relates to the technical field of geotextiles, and in particular to a multi-layer composite geotextile. Background Technology

[0002] Geotextiles are widely used in various engineering projects such as coastal engineering, foundation pit engineering, road engineering, sewage treatment plants, and landfills. Their main function is to reinforce and protect engineering structures such as dams, slopes, foundations, and roadbeds. In aquatic environments, they can also act as filters, preventing soil particles subjected to seepage pressure from being lost.

[0003] With the continuous development of construction projects, projects in complex environments require composite geotextiles with higher mechanical strength to better protect engineering structures. However, ordinary composite geotextiles have limited strength and service life; moreover, they are made using weaving methods, resulting in limited water permeability and filtration capabilities. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The technical problem to be solved by this utility model is to provide a multi-layer composite geotextile, in which the high-strength fibers are precisely and uniformly laid to maintain the uniformity of the geotextile strength; the use of pore positioning needle punching enables the high-strength fibers of the reinforcing layer to be preserved when connecting multi-layer structures, thereby fully ensuring the strength of the composite geotextile, effectively resisting the damage of loads in the environment, and better meeting the requirements of use in complex environments.

[0006] (II) Technical Solution

[0007] The solution adopted by this utility model to solve the above-mentioned technical problems is a multi-layer composite geotextile, which is composed of several needle-punched geotextiles and several reinforcing layers arranged sequentially from bottom to top and stacked alternately.

[0008] The reinforcing layer includes multiple meridians and multiple parallels arranged at equal intervals, which intersect and overlap to form multiple grid-like squares; wherein, the central pore of each grid-like square is uniform and of the same size, and the side length of the central pore is 6mm.

[0009] It should be noted that the thickness of the needle-punched geotextile and the number of reinforcing layers can be determined according to the specific application requirements.

[0010] In some embodiments, the needle-punched geotextile is made of synthetic fibers and formed by needle punching.

[0011] In some embodiments, the warp yarns are made of high-strength warp fibers, and the weft yarns are made of high-strength weft fibers; and the warp yarns and the weft yarns are woven together by a warp knitting machine.

[0012] It should be noted that the density of high-strength warp fibers and high-strength weft fibers can be determined specifically according to the reinforcement requirements.

[0013] In some embodiments, the needle-punched geotextile uses polypropylene fibers, with each layer of needle-punched geotextile having a forming thickness of approximately 1 mm, for a total of 4 layers. The ratio of high-strength warp fibers to high-strength weft fibers in the reinforcing layers is 1:1, and both are made of ultra-high molecular weight polyethylene (UHMWPE) filament fibers, with a total of 3 reinforcing layers. The UHMWPE filament fibers used have a tensile strength of approximately 3000-3500 MPa and a service life exceeding 50 years. In contrast, most unreinforced composite geotextiles use polyester fibers, polyamide fibers, and polypropylene fibers, etc., with a tensile strength typically between 500-800 MPa and a service life of less than 30 years. Therefore, the multi-layer reinforced composite geotextile based on positioning needle-punching technology has higher strength and a longer service life.

[0014] Using the above scheme, the needle-punched geotextile provides water permeability and reverse filtration functions for the multi-layer reinforced composite geotextile based on the positioning needle-punching process. The reinforcement layer enhances the mechanical strength and extends the service life of the multi-layer reinforced composite geotextile, and effectively protects the backfill soil covered by the multi-layer reinforced composite geotextile.

[0015] In some embodiments, after the reinforcing layer is woven, a thermal bonding process is used to bond the warp and weft threads together at the intersection.

[0016] By adopting the above scheme, the warp and weft threads of the reinforcing layer can be fixed together to prevent slippage, thereby maintaining the size of the grid and facilitating subsequent positioning needle punching.

[0017] In some embodiments, the reinforcing layer is disposed between two adjacent needle-punched geotextiles, and the reinforcing layer is limited and fixed after being connected by needle punching between the two adjacent needle-punched geotextiles.

[0018] In some embodiments, when the fibers of the needle-punched geotextile are needle-punched and pass through the central pores of the grid pattern of the reinforcing layer, they avoid the fibers of the reinforcing layer. This can be achieved through positioning and laying and needle-punching processes.

[0019] The positioning, laying, and needle-punching process uses the needle-punching machine's mesh surface as a two-dimensional coordinate system. After the first layer of needle-punched geotextile and the first layer of reinforcement are laid on the needle-punching machine, the computer measures parameters such as the side length of the central pore and the fiber diameter of the grid pattern in the reinforcement layer. It also measures the centroid coordinates of the first pore at the corner point of the reinforcement layer closest to the limiting edge as the starting reference coordinates. The above parameters are then input into the computer program, which outputs the coordinate region of all fiber distribution in the reinforcement layer, denoted as region A, which serves as the coordinates for subsequent positioning and laying of the reinforcement layer. Then, region A is reverse-selected in the computer to obtain the coordinate region of all pore distribution in the reinforcement layer, denoted as region B, which serves as the coordinates for subsequent positioning needle-punching points.

[0020] The limiting laying method uses two orthogonal edges on the needle punching machine mesh as limiting edges, aligns the right-angled boundary of the geotextile with the limiting edges and lays it on the mesh, and uses a pressing device to fix the geotextile.

[0021] The reverse selection is based on the area of ​​the tiling surface as a two-dimensional geometric whole set, and the selection area A is the complement region under this whole set.

[0022] The present invention discloses a method for preparing a multilayer composite geotextile, comprising the following steps:

[0023] (I) Preparation of the first layer of needle-punched geotextile: using synthetic fibers as raw materials, the fibers are laid into a web and introduced into a needle punching machine, and the first layer of needle-punched geotextile is directly processed by the needle punching process;

[0024] (II) Preparation of reinforcing layer: High-strength warp fibers and high-strength weft fibers are woven together by warp knitting machine in a way that crosses and overlaps, and then heat-bonded at the intersection to make a reinforcing layer;

[0025] (III) Align the boundary of the first layer of needle-punched geotextile with the limiting edge of the needle-punching machine, lay it on the mesh laying surface of the needle-punching machine, and then lay the reinforcement layer on the first layer of needle-punched geotextile. Use a part of the edge presser to fix the two layers of structure; use positioning laying and needle-punching process to obtain region A and region B.

[0026] (IV) The raw material of the next layer of needle-punched geotextile is laid into a web and introduced into the needle punching machine. It is then laid on the reinforcing layer. Area B is selected in the computer for needle punching to form the next layer of needle-punched geotextile and connect the three adjacent layers into a whole.

[0027] (V) First, use the remaining edge-pressing device that is not in the edge-pressing state to fix the needle-punched geotextile; then loosen the edge-pressing device that was originally in the edge-pressing state and wait for the next use;

[0028] (VI) Lay the reinforcement layer again; Select area A in the computer and position the reinforcement layer on the surface of the top needle-punched geotextile.

[0029] (VII) Repeat steps (IV) to (VI) above until the desired multi-layer reinforced composite geotextile is prepared.

[0030] In some embodiments, in step (IV), the needle passes through the central pore of the grid pattern of the reinforcing layer, entangles the fibers of two adjacent needle-punched geotextiles near the needle, and while making the next layer of needle-punched geotextile, it also restricts the position of the reinforcing layer, so that the first three layers of geotextile form a whole.

[0031] In some embodiments, in step (VII), the needle penetration depth can be set to only entangle and connect two adjacent layers of needle-punched geotextile during each subsequent needle-punching.

[0032] (III) Beneficial Effects

[0033] Compared with the existing technology, this utility model designs a multi-layer composite geotextile.

[0034] (1) This utility model has a scientific and reasonable preparation process, which can produce multi-layer reinforced composite geotextiles, which can significantly improve the tensile strength of the composite geotextiles. The high-strength fibers are precisely and evenly laid to keep the strength of the geotextile uniform. The use of pore positioning needle punching realizes that the high-strength fibers of the reinforcement layer are not damaged when connecting multi-layer structures, thus fully ensuring the strength of the composite geotextiles, which can effectively resist the damage of loads in the environment and better meet the requirements of use in complex environments.

[0035] (2) The composite geotextile structure of this utility model is reasonable, the reinforcement layer retains sufficient and uniform pores, and the needle-punched geotextile, which is the main part, is sewn by needle-punched nonwoven process, so that the product has excellent water permeability and reverse filtration function.

[0036] (3) This utility model adopts a common and mature needle punching process to connect the multi-layer structure of reinforced composite geotextile, which makes it easy to achieve mass production of geotextile; when connecting the multi-layer geotextile structure, the needle punching is performed directly without the use of binding and connecting fibers, which saves production costs and improves production efficiency. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of a multilayer composite geotextile according to the present invention;

[0039] Figure 2This is a schematic diagram of the weaving method of the reinforcing layer of this utility model;

[0040] Figure 3 This is a plan view of the limiting installation of the acupuncture machine according to this utility model.

[0041] The component names corresponding to the various labels in the figure are: 1. Needle-punched geotextile; 2. Reinforcing layer; 2-1. Warp; 2-2. Weft; 3. Needle-punched mesh laying surface; 4. Edge presser; 5. Limiting edge; L is the side length of the central hole of each grid. Detailed Implementation

[0042] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but should not be used to limit the scope of this utility model.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] It should be noted that the following description covers various aspects of embodiments within the scope of the appended claims. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0046] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0047] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0048] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0049] like Figures 1-3 As shown, this utility model provides a multi-layer composite geotextile, which is composed of several needle-punched geotextiles 1 and several reinforcing layers 2 arranged alternately from bottom to top; the reinforcing layer 2 includes multiple warp threads 2-1 and multiple weft threads 2-2 arranged at the same distance, which intersect each other in a way that the warp and weft threads cross and overlap each other to form multiple grid-shaped squares; wherein, the central pore of each grid-shaped square is uniform and of the same size, and the side length of the central pore is 6mm.

[0050] In some embodiments, the needle-punched geotextile 1 is made of synthetic fibers and formed by needle punching. In some embodiments, the warp 2-1 is made of high-strength warp fibers, and the weft 2-2 is made of high-strength weft fibers; and the warp 2-1 and the weft 2-2 are woven together by a warp knitting machine. In some embodiments, the needle-punched geotextile 1 uses polypropylene fibers, with each layer of needle-punched geotextile 1 having a forming thickness of approximately 1 mm, for a total of 4 layers; the ratio of high-strength warp fibers to high-strength weft fibers in the reinforcing layer 2 is 1:1, both using ultra-high molecular weight polyethylene (UHMWPE) filament fibers, with a total of 3 layers in the reinforcing layer 2; the UHMWPE filament fibers used have a tensile strength of approximately 3000-3500 MPa and a service life exceeding 50 years, while most non-reinforced composite single geotextiles use polyester fibers, polyamide fibers, and polypropylene fibers, etc., with a tensile strength typically between 500-800 MPa and a service life of less than 30 years. In comparison, the multi-layer reinforced composite geotextile based on positioning needle-punching technology has higher strength and a longer service life. Using the above scheme, the needle-punched geotextile 1 provides water permeability and reverse filtration functions for the multi-layer reinforced composite geotextile based on the positioning needle-punching process, and the reinforcement layer 2 provides mechanical strength enhancement and service life improvement for the multi-layer reinforced composite geotextile, effectively protecting the backfill and other materials covered by the multi-layer reinforced composite geotextile.

[0051] In some embodiments, after the reinforcing layer 2 is woven, a thermal bonding process is used to bond the warp threads 2-1 and weft threads 2-2 together at the intersection nodes. Using this method, the warp threads 2-1 and weft threads 2-2 of the reinforcing layer 2 are fixed together and will not slip, thus maintaining the size of the tic-tac-toe grid and facilitating subsequent positioning needle punching.

[0052] In some embodiments, the reinforcing layer 2 is disposed between two adjacent needle-punched geotextiles 1, and the reinforcing layer 2 is limited and fixed after being connected by needle punching of the two adjacent needle-punched geotextiles 1.

[0053] In some embodiments, when the fibers of the needle-punched geotextile 1 are needle-punched and pass through the central pores of the grid pattern of the reinforcing layer 2, they avoid the fibers of the reinforcing layer 2. This can be achieved through positioning and laying, and needle-punching. The positioning and laying process uses the needle-punching machine's mesh surface 3 as a two-dimensional coordinate system. After the first layer of needle-punched geotextile 1 and the first layer of reinforcing layer 2 are laid on the needle-punching machine in a limited position, the computer measures parameters such as the side length of the central pores and the fiber diameter of the grid pattern of the reinforcing layer 2. The centroid coordinates of the first pore at the corner point of the reinforcing layer 2 near the limiting edge 5 are measured as the starting reference coordinates. The above parameters are then input into the computer program. The process begins by outputting the coordinate region of all fiber distributions in the reinforcing layer 2, denoted as region A, which serves as the coordinates for subsequent positioning and laying of the reinforcing layer 2. Then, region A is reverse-selected in the computer to obtain the coordinate region of all pore distributions in the reinforcing layer 2, denoted as region B, which serves as the coordinates for subsequent positioning of the needle-punching points. The limiting laying method uses two orthogonal edges on the needle-punching machine's mesh surface 3 as limiting edges 5, aligning the right-angled boundary of the geotextile with the limiting edges 5 and laying it on the mesh surface, and fixing the geotextile with the edge presser 4. The reverse selection method uses the area of ​​the mesh surface as a two-dimensional geometric whole set, and selects the complement region of region A under this whole set.

[0054] The present invention discloses a method for preparing a multilayer composite geotextile, comprising the following steps:

[0055] (I) Preparation of the first layer of needle-punched geotextile 1: Polypropylene fiber is selected as raw material. The polypropylene fiber is filamentized into a web and introduced into the needle punching machine. The first layer of needle-punched geotextile 1 is directly processed by the needle punching process, with a thickness of 1 mm.

[0056] (II) Preparation of reinforcing layer 2: Ultra-high molecular weight polyethylene (UHMWPE) filament fibers are selected as high-strength warp fibers and high-strength weft fibers. The high-strength warp fibers and high-strength weft fibers are woven together by warp and weft crossing and overlapping, and then heat-bonded at the intersection to form reinforcing layer 2.

[0057] (III) Align the boundary of the first layer of needle-punched geotextile 1 with the limiting edge 5 of the needle punching machine, lay it on the mesh laying surface 3 of the needle punching machine, and then lay the reinforcing layer 2 on the first layer of needle-punched geotextile 1. Use a part of the edge pressing device 4 to fix the two layers of structure; use positioning laying and needle punching process to obtain region A and region B.

[0058] (IV) The raw material of the next layer of needle-punched geotextile 1 is laid into a net and introduced into the needle punching machine, and laid on the reinforcement layer 2. The area B is selected in the computer for needle punching, so that the next layer of needle-punched geotextile 1 is formed with a thickness of 1mm, and the adjacent three layers are connected into a whole.

[0059] (V) First, use the remaining edge-pressing device 4, which is not in the edge-pressing state, to fix the needle-punched geotextile; then loosen the edge-pressing device 4, which was originally in the edge-pressing state, and wait for the next use;

[0060] (VI) Lay the reinforcement layer 2 again; Select area A in the computer and position the reinforcement layer 2 on the surface of the uppermost needle-punched geotextile 1.

[0061] (VII) Repeat steps (IV) to (VI) above until the desired multi-layer reinforced composite geotextile is prepared.

[0062] In some embodiments, in step (IV), the needle passes through the central pore of the grid of the reinforcing layer 2, and entangles the fibers of two adjacent needle-punched geotextile 1 near the needle. While making the next layer of needle-punched geotextile 1, the position of the reinforcing layer 2 is also restricted, so that the first three layers of geotextile form a whole.

[0063] In some embodiments, in step (VII), the needle penetration depth can be set to only entangle and connect two adjacent layers of needle-punched geotextile 1 during each subsequent needle-punching.

[0064] The following is a specific application scenario of the multi-layer reinforced composite geotextile based on the positioning needle punching technology described in the above embodiments, but it is not limited to this: The multi-layer reinforced composite geotextile based on the positioning needle punching technology is transported from the factory to the construction site. After the area where the geotextile needs to be laid is leveled, the multi-layer reinforced composite geotextile is laid in the area. During the construction process, there should generally be an overlap of no less than 10cm between every two pieces of multi-layer reinforced composite geotextile, and the laid multi-layer reinforced composite geotextile should be kept flat and without bending, and tightly attached to the backfill soil underneath. After the laying is completed, other structures can be constructed on the multi-layer reinforced composite geotextile as needed for the project.

[0065] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0066] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A multi-layer composite geotextile, characterized in that: The multi-layer composite geotextile is composed of several needle-punched geotextiles (1) and several reinforcing layers (2) arranged from bottom to top, stacked alternately. The reinforcing layer (2) includes multiple meridians (2-1) and multiple parallels (2-2) arranged at the same distance, which intersect each other in a way that the meridians and parallels cross each other and overlap vertically to form multiple grid-shaped squares; wherein, the central pores of each grid-shaped square are uniform and of the same size.

2. The multilayer composite geotextile according to claim 1, characterized in that: The side length of the central hole in each grid is 6mm.

3. The multilayer composite geotextile according to claim 1, characterized in that: The needle-punched geotextile (1) is made of synthetic fibers and is formed by needle punching.

4. The multilayer composite geotextile according to claim 1, characterized in that: The warp (2-1) is made of high-strength warp fiber, and the weft (2-2) is made of high-strength weft fiber; and the warp (2-1) and the weft (2-2) are woven together by a warp knitting machine.

5. The multilayer composite geotextile according to claim 1, characterized in that: After the reinforcing layer (2) is woven, it is treated with a heat bonding process to bond the warp (2-1) and weft (2-2) together at the intersection.

6. The multilayer composite geotextile according to claim 1, characterized in that: The reinforcing layer (2) is disposed between two adjacent needle-punched geotextiles (1), and the reinforcing layer (2) is fixed by being needled together by the two adjacent needle-punched geotextiles (1).

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