A self-repairing high-strength and high-durability geotextile filling bag and its preparation method

Abstract

The present invention discloses a self-repairing high-strength and high-durability geotextile filling bag and a preparation method thereof, comprising a filling bag body, a sewing line and a filling cuff; the filling bag body is made of a self-repairing high-strength and high-durability geotextile sewn by sewing line; the self-repairing high-strength and high-durability geotextile comprises a first geotextile or a second geotextile, the first geotextile is used for filling when the soil body is fine-grained soil and needs to be blown on site, and the second geotextile is used for filling when the soil body is coarse sand and needs to be blown on site or filled with dry sand in the factory; the fine Granular soil refers to soil with a particle size of ≤0.075mm, and coarse sand refers to soil with a particle size of 0.075-2mm. The first geotextile consists of a filtration functional layer and a high-strength wear-resistant layer arranged from bottom to top. After sewing them into a filling bag, the filtration functional layer is located on the inner side of the filling bag. The second geotextile consists of a warp-knitted high-strength geotextile, a spacer yarn layer and a warp-knitted high-strength geotextile arranged from bottom to top. After sewing them into a filling bag, the warp-knitted high-strength geotextile is located on the inner side of the filling bag.

Description

Technical Field

[0001] The present invention relates to the technical field of filling bags, and in particular to a self-repairing high-strength and high-durability geotextile filling bag and a preparation method thereof. Background Art

[0002] Geotextile filling bags are tube-shaped or block-shaped bags made of water-permeable but sand-impermeable geotextiles. They have the advantages of fast construction, low cost, and good anti-scouring effect. After being filled with sand and soil, they are widely used in projects such as land reclamation, artificial island construction, and cofferdam construction.

[0003] In current practical applications, some important and key projects require the use of geotextile filling bags with higher strength, longer service life, and self-repairing capabilities. At the same time, they can use the biosolidification process to achieve self-reinforcement of the surrounding fill to adapt to the design life of the engineering structure and provide better protection. However, existing general geotextile filling bags are difficult to meet the above requirements and have the following shortcomings: 1. Insufficient strength and service life. Generally, they will be damaged or decomposed within 30 years, making it difficult to achieve long-term or even permanent use; 2. The structural composition and weaving method are simple, and fine-grained soil can easily pass through the pores of the fabric, cutting and damaging the fabric fibers, thereby reducing its strength and life; 3. They have no self-repairing ability and cannot automatically reinforce and repair the engineering structure during use, thereby failing to reduce the cost of subsequent maintenance and repairs.

[0004] Therefore, in order to meet the growing construction requirements and address the problems existing in general geotextile filling bags, there is an urgent need for a geotextile filling bag with high strength, long life and certain self-repairing ability. Summary of the Invention

[0005] (1) Technical issues to be resolved

[0006] The technical problem to be solved by the present invention is to provide a self-repairing, high-strength and high-durability geotextile filling bag and a preparation method, which can be used as a protective cofferdam in fill projects in water environments such as land reclamation and island construction, dam cofferdams, etc., and has high strength and long life. The fill in and around the filling bag is consolidated through biological solidification, and eventually becomes part of the permanent structure of the project.

[0007] (2) Technical solution

[0008] The solution adopted by the present invention to solve the above technical problems is a self-repairing high-strength and high-durability geotextile filling bag, which includes a filling bag body, a sewing line and a filling cuff;

[0009] The filling bag is made of a self-repairing, high-strength, and high-durability geotextile sewn together with sewing thread; the self-repairing, high-strength, and high-durability geotextile includes a first geotextile or a second geotextile. The first geotextile is used when the filling soil is fine-grained soil and requires on-site blow-filling, and the second geotextile is used when the filling soil is coarse sand and requires on-site blow-filling or factory dry sand filling. The fine-grained soil is soil with a particle size of ≤0.075 mm, and the coarse sand is soil with a particle size of 0.075-2 mm.

[0010] The first geotextile is composed of a filtration function layer and a high-strength wear-resistant layer arranged in sequence from bottom to top, and after being sewn into a filling bag body, the filtration function layer is located on the inner side of the filling bag body;

[0011] The second geotextile is composed of a warp knitted high-strength geotextile, a spacer yarn layer and a warp knitted high-strength geotextile arranged in sequence from bottom to top, and after being sewn into a filling bag, the warp knitted high-strength geotextile is located inside the filling bag.

[0012] In some embodiments, the filtration functional layer of the first geotextile is made of synthetic fibers and bio-cured functional fibers that are opened and mixed and then processed by a needle punching process;

[0013] The bio-curing functional fiber is prepared by mixing and stirring a gel matrix, a bio-curing liquid, calcium chloride and urea to form a bio-gel, and then extruding the bio-gel from a nozzle using a single-channel extrusion 3D printing device to form the fiber; wherein the gel matrix is ​​made of gelatin or sodium alginate, and the bio-curing liquid is made of Bacillus pasteurianus liquid or soybean urease solution.

[0014] In some embodiments, the high-strength wear-resistant layer of the first geotextile is woven by high-strength synthetic fibers using a warp knitting method, and during the warp knitting process, the high-strength synthetic fibers overlap and pass through each other in the warp and weft directions to form a grid structure.

[0015] In some embodiments, the filtration functional layer and the high-strength wear-resistant layer of the first geotextile are fixed together by local hot compression molding;

[0016] The local hot compression molding refers to laying the prepared filtration functional layer on the high-strength wear-resistant layer, and using a hot compression molding machine to heat and compress the two-layer structure at some points distributed in an array, so that the synthetic fibers in the filtration functional layer and the high-strength synthetic fibers in the high-strength wear-resistant layer are bonded together, thereby connecting and fixing the filtration functional layer and the high-strength wear-resistant layer of the first geotextile.

[0017] In some embodiments, a hot compression molding machine is used to heat and compression mold the two-layer structure using matrix distribution points with a spacing of 3 cm.

[0018] In some embodiments, the two layers of the second geotextile are made of high-strength synthetic fibers; the spacer yarn layer of the second geotextile uses core-spun yarn with a biocuring function as the spacer yarn fiber, and the high-strength synthetic fibers and the core-spun yarn with a biocuring function are introduced together into a Raschel double needle bed warp knitting machine, and the second geotextile is integrally woven using a warp knitting spacer weaving method;

[0019] The core-spun yarn with biocuring function is prepared by mixing and stirring a gel matrix, a biocuring liquid, calcium chloride and urea to form a biogel, then heating the raw material of the synthetic fiber, polypropylene, at a relatively low temperature to a viscous plastic liquid, and then using a dual-channel coaxial extrusion 3D printing device to extrude the biogel and the viscous plastic liquid from the outer and inner nozzles respectively to form a core-spun yarn with a reasonable diameter. After extrusion, the biogel will become the outer layer of the core-spun yarn, and the viscous plastic liquid will solidify to become the core yarn portion of the core-spun yarn.

[0020] In some embodiments, when the self-repairing high-strength and high-durability geotextile is sewn with sewing thread to form a filling bag, the self-repairing high-strength and high-durability geotextile is first folded in half along the center line so that the three side lines are aligned; a filling cuff is set at a certain distance on the long side line; then two or three sewing threads are used to be laid along the aligned side lines of the self-repairing high-strength and high-durability geotextile, and the sewing threads are passed through and sewn up and down. When the filling cuff passes through the contact point between the filling cuff and the self-repairing high-strength and high-durability geotextile, the filling cuff and the self-repairing high-strength and high-durability geotextile are sewn into a whole.

[0021] In some embodiments, the sewing thread is made of synthetic fiber thread; the filling cuff is made of synthetic fiber woven into geotextile, which is sewn into a tubular cuff.

[0022] The solution adopted by the present invention to solve the above technical problems is a method for preparing a self-repairing high-strength and high-durability geotextile filling bag, comprising the following steps:

[0023] (I) Determine the type of self-repairing, high-strength, high-durability geotextile to be used based on the particle size of the sand in the application environment: If the filling soil is fine-grained soil and needs to be blown in on site, use the first geotextile; If the filling soil is coarse sand and needs to be blown in on site or filled with dry sand in the factory, use the second geotextile;

[0024] (II) When the filling soil is fine-grained soil and requires on-site filling, a first geotextile is prepared: a gel matrix, a bio-curing liquid, calcium chloride, and urea are mixed and stirred to form a bio-gel, and a single-channel extrusion 3D printing device is used to extrude the bio-gel from a nozzle to form a bio-curing functional fiber, the diameter of the bio-curing functional fiber being determined according to actual needs; the synthetic fiber and the bio-curing functional fiber are then opened and mixed and then processed into a filtration functional layer through a needle punching process;

[0025] Use a warp knitting machine to overlap and cross high-strength synthetic fibers in the warp and weft directions to weave them into a grid structure to form a high-strength wear-resistant layer;

[0026] The filter functional layer is then laid on the high-strength wear-resistant layer, and the two layers are heated and compressed at some points distributed in an array using a hot compression molding machine, so that the synthetic fibers in the filter functional layer and the high-strength synthetic fibers in the high-strength wear-resistant layer are bonded together, thereby connecting and fixing the filter functional layer and the high-strength wear-resistant layer of the first geotextile to obtain the first geotextile;

[0027] (III) When the filling soil is coarse sand and is filled on site or filled with dry sand in the factory, prepare the second geotextile:

[0028] A gel matrix, a biocuring liquid, calcium chloride, and urea are mixed and stirred to form a biogel. Polypropylene, the raw material of the synthetic fiber, is then heated at a low temperature to a viscous plastic liquid. A dual-channel coaxial extrusion 3D printing device is then used to extrude the biogel and the viscous plastic liquid from the outer and inner nozzles, respectively, to form a core-spun yarn with a biocuring function. The diameter of the core-spun yarn with a biocuring function is determined according to actual needs. After extrusion, the biogel will become the outer layer of the core-spun yarn, and the viscous plastic liquid will solidify to become the core yarn portion of the core-spun yarn.

[0029] High-strength synthetic fibers and core-spun yarns with bio-curing functions are introduced into a Raschel double-needle-bed warp knitting machine and woven into a warp knitted spacer fabric using a warp knitting spacer weaving method.

[0030] (IV) The inner diameter of the filling cuff is determined according to the outer diameter of the grouting pipe used for sand filling, and the filling cuff is woven with synthetic fibers;

[0031] (V) Fold the self-repairing high-strength and high-durability geotextile in half along the center line so that the three side lines are aligned; set a filling cuff at a certain distance on the long side line, and the total number of filling cuffs set can be determined according to the volume of the filling bag body; use sewing thread to sew the filling bag body and the filling cuffs into a self-repairing high-strength and high-durability geotextile filling bag.

[0032] In some embodiments, in step (V), two or three sewing lines are arranged along the aligned edge lines of the self-repairing high-strength and high-durability geotextile, and are sewed up and down. When passing through the contact point between the filling cuff and the self-repairing high-strength and high-durability geotextile, the self-repairing high-strength and high-durability geotextile and the filling cuff are sewn into a self-repairing high-strength and high-durability geotextile filling bag; the sewing lines are made of synthetic fiber wire.

[0033] In some embodiments, in step (II) and step (III), the gel matrix is ​​made of gelatin or sodium alginate; in step (III), the biocuring liquid is made of Bacillus pasteurianus liquid or soybean urease solution.

[0034] (3) Beneficial effects

[0035] Compared with the prior art, the present invention designs a self-repairing high-strength and high-durability geotextile filling bag and its preparation method.

[0036] (1) The present invention has a scientific and reasonable composition structure and weaving process. On the one hand, it improves the mechanical strength of the self-repairing high-strength and high-durability geotextile filling bag, can effectively resist the damage of the load in the application environment, and is not easy to break or crack; on the other hand, it ensures that the self-repairing high-strength and high-durability geotextile filling bag has good water permeability and anti-filtration functions;

[0037] (2) The present invention fully considers important environmental factors and sets up targeted solutions: the first geotextile is used in a fine-grained sandy soil environment that is easy to damage fabric fibers, and its filtration function layer can effectively prevent fine-grained soil from penetrating the pores, protecting the high-strength fibers of the outer layer; the second geotextile is used in a coarse sandy soil environment, and the inner layer of warp-knitted high-strength geotextile is sufficient to block the coarse-grained soil, and the interlayer spacer yarn also has an excellent filtration function, further protecting the high-strength fibers of the outer layer; the two solutions set up by the present invention have a reasonable structure, effectively maintain the strength of the filling bag, and can adapt to the needs of various use environments;

[0038] (3) Due to the high-strength and long-life materials selected and the reasonable structure and scheme, the present invention can realize the use of geotextile filling bags and filled sand as permanent structures. Generally, there is no need for mid-term repair and replacement, which saves maintenance costs and improves the safety of the engineering structure during use;

[0039] (4) The present invention adopts common warp knitting technology and needle punching technology to manufacture geotextiles, and adopts simple up and down stitching to sew the edge of the filling bag body, which can easily realize the mass production of self-repairing high-strength and high-durability geotextile filling bags;

[0040] (5) The present invention has biological self-repairing ability. After the laying is completed and soaked in water, the biological curing reaction starts, which can continuously reinforce the sand filled inside the geotextile filling bag and the surrounding fill, producing a long-term reinforcement and protection effect that is better than that of ordinary filling bags;

[0041] (6) The filling cuffs of the present invention are installed at the seams of the filling bag body. Compared with the traditional filling bag body with holes opened on the bag body, the filling cuffs of the present invention reduce the adverse effects on the strength and durability of the filling bag body, which is conducive to improving the service life of the filling bag body. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] Figure 1 This is a schematic diagram of the self-repairing high-strength and high-durability geotextile filling bag of the present invention;

[0044] Figure 2 1 is a schematic diagram of the layers of the first geotextile of Example 1;

[0045] Figure 3 Schematic diagram of the layers of the second geotextile in Example 2.

[0046] The names of the components corresponding to the various figure marks in the figure are: 1. Filling bag body; 2. Self-repairing high-strength and high-durability geotextile; 2-1. Filtration functional layer; 2-2. High-strength wear-resistant layer; 2-3. Spacer yarn layer; 2-4. Warp-knitted high-strength geotextile; 2a. First geotextile; 2b. Second geotextile; 3. Sewing line; 4. Filling cuff. DETAILED DESCRIPTION

[0047] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0048] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0049] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0050] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an 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 aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0051] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0052] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples, however, one skilled in the art will appreciate that the examples can be practiced without these specific details.

[0053] The following describes the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings. Example 1:

[0054] like Figure 1-Figure 2As shown, the present invention provides a self-repairing high-strength and high-durability geotextile filling bag, comprising a filling bag body 1, a sewing line 3 and a filling cuff 4; the filling bag body 1 is made of a self-repairing high-strength and high-durability geotextile 2 sewn together by a sewing line 3; the self-repairing high-strength and high-durability geotextile 2 comprises a first geotextile 2a, which is used when the filling soil is fine-grained soil and needs to be blown on site; the fine-grained soil is soil with a particle size of ≤0.075mm; the first geotextile 2a is composed of a filtering functional layer 2-1 and a high-strength wear-resistant layer 2-2 arranged in sequence from bottom to top, and, after sewing into the filling bag body 1, the filtering functional layer 2-1 is located on the inner side of the filling bag body 1.

[0055] In some embodiments, the synthetic fibers in the functional filtration layer 2-1 of the first geotextile 2a are polypropylene fibers with a tensile strength of 800-1000 MPa. The biocuring fibers in the functional filtration layer 2-1 are prepared by mixing a sodium alginate gel matrix, a Bacillus pasteurianus bacterial solution (OD600 = 1), calcium chloride, and urea in a ratio of 3:1:2:2 to form a biogel. The biogel is then extruded from a nozzle using a single-channel 3D printing device. All fibers in the functional filtration layer 2-1 are loosened and mixed before being needle-punched to form the fibers. The formed thickness of the functional filtration layer 2-1 is 5 mm, ensuring the permeability and filtration properties of conventional needle-punched geotextiles. The biocuring fibers gradually decompose and maintain a long-term biocuring effect. The ratio of synthetic fibers to biocuring fibers in the functional filtration layer 2-1 is 3:2.

[0056] In some embodiments, the high-strength synthetic fiber of the high-strength wear-resistant layer 2-2 of the first geotextile 2a is ultra-high molecular weight polyethylene (UHMWPE) filament fiber, and its tensile strength is 3000-3500 MPa; during warp knitting, the fibers overlap and pass through up and down in the warp and weft directions to form a grid structure.

[0057] In some embodiments, the functional filtration layer 2-1 and the high-strength wear-resistant layer 2-2 of the first geotextile 2a are fixed together by localized hot compression molding. Localized hot compression molding involves laying the prepared functional filtration layer 2-1 on the high-strength wear-resistant layer 2-2 and heat-compression molding the two layers using a hot compression molding machine at points spaced 3 cm apart in a matrix pattern, so that the synthetic fibers in the functional filtration layer 2-1 and the high-strength synthetic fibers in the high-strength wear-resistant layer 2-2 are bonded together, thereby connecting and fixing the functional filtration layer 2-1 and the high-strength wear-resistant layer 2-2 of the first geotextile 2a together. The molded thickness of the first geotextile 2a is 6 mm.

[0058] In some embodiments, when the self-repairing, high-strength, and high-durability geotextile 2 is sewn together with sewing thread 3 to form the filling bag 1, the sewing thread 3 is made of ultra-high molecular weight polyethylene (UHMWPE) filaments. The filling cuff 4 is made of polypropylene fibers woven into a geotextile and sewn into a tubular cuff. The self-repairing, high-strength, and high-durability geotextile 2 is first folded in half along its centerline, aligning its three edges. A filling cuff 4 is positioned every 50 cm along the long edges. Sewing thread 3 is then laid three times along the aligned edges of the self-repairing, high-strength, and high-durability geotextile 2, crossing and sewing the filling cuff 4 and the self-repairing, high-strength, and high-durability geotextile 2. When the sewing thread 3 passes through the contact point between the filling cuff 4 and the self-repairing, high-strength, and high-durability geotextile 2, the filling cuff 4 and the self-repairing, high-strength, and high-durability geotextile 2 are sewn together.

[0059] The present invention also provides a method for preparing a self-repairing high-strength and high-durability geotextile filling bag, comprising the following steps:

[0060] (I) Determine the type of self-repairing high-strength and high-durability geotextile 2 to be used based on the particle size of the sand in the application environment: if the filling soil is fine-grained soil and needs to be blown in on site, use the first geotextile 2a; if the filling soil is coarse sand and needs to be blown in on site or filled with dry sand in the factory, use the second geotextile 2b;

[0061] (II) When the filling soil is fine-grained soil and on-site filling is required, a first geotextile 2a is prepared: a sodium alginate gel matrix, a Bacillus pasteurianus bacterial solution (OD600=1), calcium chloride, and urea are mixed and stirred in a ratio of 3:1:2:2 to form a biogel, and a single-channel extrusion 3D printing device is used to extrude the biogel from a nozzle to form a bio-curing functional fiber, the diameter of the bio-curing functional fiber being 0.6 mm; polypropylene fiber and the bio-curing functional fiber are then opened and mixed and then processed into a filtration functional layer 2-1 with a thickness of 5 mm by a needle punching process;

[0062] Using a warp knitting machine, ultra-high molecular weight polyethylene (UHMWPE) filament fibers are overlapped and crossed in the warp and weft directions to form a grid structure to form a high-strength wear-resistant layer 2-2;

[0063] The filter functional layer 2-1 is then laid on the high-strength wear-resistant layer 2-2. A hot compression molding machine is used to heat and compress the two layers at points spaced 3 cm apart in a matrix pattern, so that the synthetic fibers in the filter functional layer 2-1 and the high-strength synthetic fibers in the high-strength wear-resistant layer 2-2 are bonded together, thereby connecting and fixing the filter functional layer 2-1 and the high-strength wear-resistant layer 2-2 of the first geotextile 2a. A first geotextile 2a is obtained with a thickness of 6 mm.

[0064] (III) determining the inner diameter of the filling cuff 4 according to the outer diameter of the grouting pipe used for sand filling, and weaving and sewing the filling cuff 4 with polypropylene fibers;

[0065] (IV) Fold the self-repairing high-strength and high-durability geotextile 2 in half along the center line so that the three side lines are aligned; set a filling cuff 4 every 50 cm at the long side line, and the total number of filling cuffs 4 set can be determined according to the volume of the filling bag body 1; use ultra-high molecular weight polyethylene (UHMWPE) filament fiber sewing thread 3 to sew the filling bag body 1 and the filling cuffs 4 into a self-repairing high-strength and high-durability geotextile filling bag.

[0066] In some embodiments, in step (IV), three sewing lines 3 are arranged along the aligned edge lines of the self-repairing high-strength and high-durability geotextile 2, and are sewed up and down. When passing through the contact point between the filling cuff 4 and the self-repairing high-strength and high-durability geotextile 2, the self-repairing high-strength and high-durability geotextile 2 and the filling cuff 4 are sewn into a self-repairing high-strength and high-durability geotextile filling bag. Example 2:

[0067] like Figure 1 , Figure 3 As shown, the present invention provides a self-repairing high-strength and high-durability geotextile filling bag, comprising a filling bag body 1, a sewing line 3 and a filling cuff 4; the filling bag body 1 is made of a self-repairing high-strength and high-durability geotextile 2 sewn together by a sewing line 3; the self-repairing high-strength and high-durability geotextile 2 includes a second geotextile 2b, which is used for filling soil that is coarse sand, and is used for on-site blowing or factory dry sand filling; the coarse sand is soil with a particle size of 0.075-2mm; the second geotextile 2b is composed of a warp-knitted high-strength geotextile 2-4, a spacer yarn layer 2-3 and a warp-knitted high-strength geotextile 2-4 arranged in sequence from bottom to top, and after sewing into the filling bag body 1, the warp-knitted high-strength geotextile 2-4 is located on the inner side of the filling bag body 1.

[0068] In some embodiments, the two layers of warp-knitted high-strength geotextiles 2-4 of the second geotextile 2b are made of ultra-high molecular weight polyethylene (UHMWPE) filaments with a tensile strength of 3000-3500 MPa. The spacer yarn layer 2-3 of the second geotextile 2b utilizes a core-spun yarn with biocuring properties. The biogel is prepared by mixing a sodium alginate gel matrix, a Bacillus pasteurianus bacterial solution (OD600 = 1), calcium chloride, and urea in a ratio of 3:1:2:2. Polypropylene is then heated at a low temperature to a viscous plastic liquid. The biogel and the viscous plastic liquid are then extruded from the outer and inner nozzles, respectively, using a dual-channel coaxial extrusion 3D printing device to form a core-spun yarn with a suitable diameter. After extrusion, the biogel forms the outer sheath of the core-spun yarn, while the viscous plastic liquid solidifies to form the core yarn. These fibers are then introduced into a Raschel double-needle bed warp knitting machine and woven using a warp knitting interval weave to form the second geotextile 2b, with a finished thickness of 6 mm.

[0069] In some embodiments, when the self-repairing, high-strength, and high-durability geotextile 2 is sewn together with sewing thread 3 to form the filling bag 1, the sewing thread 3 is made of ultra-high molecular weight polyethylene (UHMWPE) filaments. The filling cuff 4 is made of polypropylene fibers woven into a geotextile and sewn into a tubular cuff. The self-repairing, high-strength, and high-durability geotextile 2 is first folded in half along its centerline, aligning its three edges. A filling cuff 4 is positioned every 50 cm along the long edges. Sewing thread 3 is then laid three times along the aligned edges of the self-repairing, high-strength, and high-durability geotextile 2, crossing and sewing the filling cuff 4 and the self-repairing, high-strength, and high-durability geotextile 2. When the sewing thread 3 passes through the contact point between the filling cuff 4 and the self-repairing, high-strength, and high-durability geotextile 2, the filling cuff 4 and the self-repairing, high-strength, and high-durability geotextile 2 are sewn together.

[0070] The present invention also provides a method for preparing a self-repairing high-strength and high-durability geotextile filling bag, comprising the following steps:

[0071] (I) Determine the type of self-repairing high-strength and high-durability geotextile 2 to be used based on the particle size of the sand in the application environment: if the filling soil is fine-grained soil and needs to be blown in on site, use the first geotextile 2a; if the filling soil is coarse sand and needs to be blown in on site or filled with dry sand in the factory, use the second geotextile 2b;

[0072] (II) When the filling soil is coarse sand and is filled on site or filled with dry sand in the factory, prepare the second geotextile 2b:

[0073] A sodium alginate gel matrix, a Bacillus pasteurianus bacterial solution (OD600=1), calcium chloride, and urea are mixed and stirred in a ratio of 3:1:2:2 to form a biogel. Polypropylene, the raw material for synthetic fibers, is then heated at a low temperature to a viscous plastic liquid. A dual-channel coaxial extrusion 3D printing device is then used to extrude the biogel and the viscous plastic liquid from the outer and inner nozzles, respectively, to form a core-spun yarn with a biocuring function. The diameter of the core-spun yarn with a biocuring function is determined according to actual needs. After extrusion, the biogel will become the outer layer of the core-spun yarn, and the viscous plastic liquid will solidify to form the core yarn portion of the core-spun yarn.

[0074] Ultra-high molecular weight polyethylene (UHMWPE) filament fibers and core-spun yarn with bio-curing function are introduced into a Raschel double needle bed warp knitting machine, and the second geotextile 2b is formed by warp knitting interval weaving method, with a forming thickness of 6 mm;

[0075] (III) determining the inner diameter of the filling cuff 4 according to the outer diameter of the grouting pipe used for sand filling, and weaving and sewing the filling cuff 4 with polypropylene fibers;

[0076] (IV) Fold the self-repairing high-strength and high-durability geotextile 2 in half along the center line so that the three side lines are aligned; set a filling cuff 4 every 50 cm at the long side line, and the total number of filling cuffs 4 set can be determined according to the volume of the filling bag body 1; use ultra-high molecular weight polyethylene (UHMWPE) filament fiber sewing thread 3 to sew the filling bag body 1 and the filling cuffs 4 into a self-repairing high-strength and high-durability geotextile filling bag.

[0077] In some embodiments, in step (IV), three sewing lines 3 are arranged along the aligned edge lines of the self-repairing high-strength and high-durability geotextile 2, and are sewed up and down. When passing through the contact point between the filling cuff 4 and the self-repairing high-strength and high-durability geotextile 2, the self-repairing high-strength and high-durability geotextile 2 and the filling cuff 4 are sewn into a self-repairing high-strength and high-durability geotextile filling bag.

[0078] The following is a specific application scenario of the self-repairing high-strength and high-durability geotextile filling bags of the above-mentioned Examples 1 and 2, but is not limited to this: the self-repairing high-strength and high-durability geotextile filling bags are transported from the factory to the cofferdam construction site, the filling cuff 4 is tightly put on the grouting pipe to fill with sand and soil, and the filling cuff 4 is tied after the filling is completed; the self-repairing high-strength and high-durability geotextile filling bags filled with sand are laid and stacked to form a cofferdam, and the seams need to be staggered when laying. After laying is completed, the microbial curing reaction gradually proceeds, continuously reinforcing the sand and soil inside and around the filling bags, further protecting the engineering structure, and eventually becoming a permanent part of the structure.

[0079] The same or similar parts between the various embodiments in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0080] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A self-repairing high-strength and high-durability geotextile filling bag, characterized by: It comprises a filling bag body (1), a sewing thread (3) and a filling cuff (4); The filling bag body (1) is made of a self-repairing high-strength and high-durability geotextile (2) sewn together with a sewing thread (3); the self-repairing high-strength and high-durability geotextile (2) includes a first geotextile (2a) or a second geotextile (2b), the first geotextile (2a) is used when the filling soil is fine-grained soil and needs to be blown on site, and the second geotextile (2b) is used when the filling soil is coarse sand and needs to be blown on site or filled with dry sand in the factory; the fine-grained soil is soil with a particle size of ≤0.075 mm, and the coarse sand is soil with a particle size of 0.075-2 mm; The first geotextile (2a) is composed of a filtering functional layer (2-1) and a high-strength wear-resistant layer (2-2) arranged in sequence from bottom to top, and after being sewn together to form a filling bag body (1), the filtering functional layer (2-1) is located on the inner side of the filling bag body (1); The filtration functional layer (2-1) of the first geotextile (2a) is made of synthetic fibers and bio-cured functional fibers that are opened and mixed and then processed by a needle punching process; The bio-curing functional fiber is prepared by mixing a gel matrix, a bio-curing liquid, calcium chloride, and urea to form a bio-gel, and then extruding the bio-gel from a nozzle using a single-channel extrusion 3D printing device to form the fiber; wherein the gel matrix is ​​made of gelatin or sodium alginate, and the bio-curing liquid is made of a Bacillus pasteurianus liquid or a soybean urease solution; The second geotextile (2b) is composed of a warp-knitted high-strength geotextile (2-4), a spacer yarn layer (2-3), and a warp-knitted high-strength geotextile (2-4) arranged in sequence from bottom to top, and after being sewn together to form a filling bag (1), the warp-knitted high-strength geotextile (2-4) is located on the inner side of the filling bag (1); The two layers of warp-knitted high-strength geotextiles (2-4) of the second geotextile (2b) are made of high-strength synthetic fibers; the spacer yarn layer (2-3) of the second geotextile (2b) uses core-spun yarns with a bio-curing function as spacer yarn fibers; the high-strength synthetic fibers and the core-spun yarns with a bio-curing function are introduced together into a Raschel double-needle bed warp knitting machine, and the second geotextile (2b) is integrally woven using a warp-knitted spacer weaving method; The core-spun yarn with biocuring function is prepared by mixing and stirring a gel matrix, a biocuring liquid, calcium chloride and urea to form a biogel, then heating the raw materials of the synthetic fiber at a relatively low temperature to a viscous plastic liquid, and then using a dual-channel coaxial extrusion 3D printing device to extrude the biogel and the viscous plastic liquid from the outer and inner nozzles respectively to form a core-spun yarn with a reasonable diameter. After extrusion, the biogel will become the outer layer of the core-spun yarn, and the viscous plastic liquid will solidify to become the core yarn part of the core-spun yarn.

2. The self-repairing high-strength and high-durability geotextile filling bag according to claim 1 is characterized in that: The high-strength wear-resistant layer (2-2) of the first geotextile (2a) is woven by high-strength synthetic fibers using a warp knitting method, and during the warp knitting, the high-strength synthetic fibers overlap and pass through each other in the warp and weft directions to form a grid-like structure.

3. The self-repairing high-strength and high-durability geotextile filling bag according to claim 1 is characterized by: The filtering functional layer (2-1) and the high-strength wear-resistant layer (2-2) of the first geotextile (2a) can be fixed together by local hot compression molding; The local hot compression molding refers to laying the prepared filter function layer (2-1) on the high-strength wear-resistant layer (2-2), and using a hot compression molding machine to heat and compress the two-layer structure at some points distributed in an array, so that the synthetic fibers in the filter function layer (2-1) and the high-strength synthetic fibers in the high-strength wear-resistant layer (2-2) are bonded together, thereby connecting and fixing the filter function layer (2-1) and the high-strength wear-resistant layer (2-2) of the first geotextile (2a).

4. The self-repairing high-strength and high-durability geotextile filling bag according to claim 1 is characterized in that: When the self-repairing high-strength and high-durability geotextile (2) is sewn together with sewing threads (3) to form a filling bag body (1), the self-repairing high-strength and high-durability geotextile (2) is first folded in half along the center line so that the three side lines are aligned; a filling cuff (4) is arranged at intervals on the long side line; and then two or three sewing threads (3) are laid along the aligned side lines of the self-repairing high-strength and high-durability geotextile (2), and the sewing threads are passed through and sewn up and down. When the sewing threads pass through the contact point between the filling cuff (4) and the self-repairing high-strength and high-durability geotextile (2), the filling cuff (4) and the self-repairing high-strength and high-durability geotextile (2) are sewn into a whole.

5. The self-repairing high-strength and high-durability geotextile filling bag according to claim 1 is characterized in that: The sewing thread (3) is made of synthetic fiber thread; the filling cuff (4) is made of synthetic fiber woven into geotextile, which is sewn into a tubular cuff.

6. A method for preparing a self-repairing high-strength and high-durability geotextile filling bag, characterized by: The following steps are included: (I) Determine the type of self-repairing high-strength and high-durability geotextile (2) to be used based on the particle size of the sand in the application environment: if the filling soil is fine-grained soil and needs to be blown in on site, use the first geotextile (2a); if the filling soil is coarse sand and needs to be blown in on site or filled with dry sand in the factory, use the second geotextile (2b); (II) When the filling soil is fine-grained soil and requires on-site filling, the first geotextile (2a) is prepared: the gel matrix, bio-curing liquid, calcium chloride and urea are mixed and stirred to form a bio-gel, and the bio-curing functional fiber is extruded from a nozzle using a single-channel extrusion 3D printing device to form a bio-curing functional fiber. The diameter of the bio-curing functional fiber is determined according to actual needs; the synthetic fiber and the bio-curing functional fiber are then opened and mixed and then processed into a filter functional layer (2-1) through a needle punching process; Using a warp knitting machine, high-strength synthetic fibers are overlapped and woven up and down in the warp and weft directions to form a grid structure, thereby forming a high-strength wear-resistant layer (2-2); The filter function layer (2-1) is then laid on the high-strength wear-resistant layer (2-2), and the two-layer structure is heated and pressed at some points distributed in an array using a hot compression molding machine, so that the synthetic fibers in the filter function layer (2-1) and the high-strength synthetic fibers in the high-strength wear-resistant layer (2-2) are bonded together, thereby connecting and fixing the filter function layer (2-1) and the high-strength wear-resistant layer (2-2) of the first geotextile (2a), thereby obtaining the first geotextile (2a); (III) When the filling soil is coarse sand and is filled on site or filled with dry sand in the factory, prepare the second geotextile (2b): A gel matrix, a biocuring liquid, calcium chloride, and urea are mixed and stirred to form a biogel. Polypropylene, the raw material of the synthetic fiber, is then heated at a low temperature to a viscous plastic liquid. A dual-channel coaxial extrusion 3D printing device is then used to extrude the biogel and the viscous plastic liquid from the outer and inner nozzles, respectively, to form a core-spun yarn with a biocuring function. The diameter of the core-spun yarn with a biocuring function is determined according to actual needs. After extrusion, the biogel will become the outer layer of the core-spun yarn, and the viscous plastic liquid will solidify to become the core yarn portion of the core-spun yarn. High-strength synthetic fibers and core-spun yarns with bio-curing function are introduced into a Raschel double-needle bed warp knitting machine, and the warp knitting spacer weaving method is adopted to weave the whole into a warp knitted spacer fabric, namely the second geotextile (2b); (IV) determining the inner diameter of the filling cuff (4) according to the outer diameter of the grouting pipe used for sand filling, and weaving and sewing the filling cuff (4) with synthetic fibers; (V) Folding the self-repairing high-strength and high-durability geotextile (2) in half along the center line so that the three side lines are aligned; setting a filling cuff (4) at a certain interval on the long side line, and the total number of the filling cuffs (4) set can be determined according to the volume of the filling bag body (1); using sewing thread (3) to sew the filling bag body (1) and the filling cuffs (4) into a self-repairing high-strength and high-durability geotextile filling bag.

7. The method for preparing the self-repairing high-strength and high-durability geotextile filling bag according to claim 6, characterized in that: In step (V), two or three sewing lines (3) are arranged along the aligned edge lines of the self-repairing high-strength and high-durability geotextile (2), and are sewed up and down. When the sewing lines (3) pass through the contact point between the filling cuff (4) and the self-repairing high-strength and high-durability geotextile (2), the self-repairing high-strength and high-durability geotextile (2) and the filling cuff (4) are sewn together to form a self-repairing high-strength and high-durability geotextile filling bag; the sewing lines (3) are made of synthetic fiber wire.

8. The method for preparing the self-repairing high-strength and high-durability geotextile filling bag according to claim 6, characterized in that: In step (II) and step (III), the gel matrix is ​​made of gelatin or sodium alginate; in step (III), the bio-curing liquid is made of Bacillus pasteurianus liquid or soybean urease solution.

Images