Self-repairing high-strength high-durability geotextile filling bag and preparation method

Abstract

The invention discloses a self-repairing high-strength and high-durability geotextile filling bag and a preparation method. The self-repairing high-strength and high-durability geotextile filling bag comprises a filling bag body, sewing threads and filling cuffs. The filling bag body is formed by sewing self-repairing high-strength and high-durability geotechnical cloth through sewing threads; the self-repairing high-strength high-durability geotechnical cloth comprises first geotechnical cloth or second geotechnical cloth, when the first geotechnical cloth is used for filling a soil body which is fine-grained soil and needs to be subjected to field hydraulic reclamation, the second geotechnical cloth is used for filling the soil body which is coarse sand, and when the first geotechnical cloth is subjected to field hydraulic reclamation or factory dry sand filling; the fine-grained soil is soil with the particle size being smaller than or equal to 0.075 mm, and the coarse sand is soil with the particle size being 0.075-2 mm; the first geotechnical cloth is composed of a filtering function layer and a high-strength wear-resistant layer which are sequentially arranged from bottom to top, and after the filling bag body is formed through sewing, the filtering function layer is located on the inner side of the filling bag body; the second geotechnical cloth is composed of a warp-knitted high-strength geotechnical cloth body, a spacer yarn layer and a warp-knitted high-strength geotechnical cloth body which are sequentially arranged from bottom to top, and after the filling bag body is formed through sewing, the warp-knitted high-strength geotechnical cloth body is located on the inner side of the filling bag body.

Description

Technical Field

[0001] The 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-scour effect. After being filled with sand and soil, they are widely used in projects such as land reclamation, construction of artificial islands, and construction of cofferdams.

[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 ability, and at the same time, the biosolidification process can be used to achieve self-reinforcement and strengthening of the surrounding fill to adapt to the design life of the engineering structure and provide better protection. However, the 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. There is no self-repairing ability, and it is impossible to self-reinforce and repair the engineering structure during use, thereby failing to reduce the cost of later 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 in land reclamation, island construction, dam cofferdams and other fill projects in water environments as a protective cofferdam, has high strength and long life, and consolidates the fill in and around the filling bag through biological solidification, and eventually becomes a part of the permanent structure of the project.

[0007] (II) 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, including a filling bag body, a sewing line and a filling cuff;

[0009] The filling bag body is made of self-repairing high-strength and high-durability geotextile sewn by 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 needs to be filled on site, and the second geotextile is used when the filling soil is coarse sandy soil and needs to be filled on site or filled with dry sand in the factory; the fine-grained soil is soil with a particle size of ≤0.075mm, and the coarse sandy soil is soil with a particle size of 0.075-2mm;

[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 body, the warp knitted high-strength geotextile is located on the inner side of the filling bag body.

[0012] In some embodiments, the filtration functional layer of the first geotextile is made of synthetic fibers and bio-cured functional fibers through opening and mixing and then needle punching;

[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 extruding the bio-gel from a nozzle using a single-channel extrusion 3D printing device to form the fiber; wherein the gel matrix can be made of gelatin or sodium alginate, and the bio-curing liquid can be 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 according to a warp knitting method, and during the warp knitting, the high-strength synthetic fibers overlap and pass through up and down 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 warp-knitted high-strength geotextile of the second geotextile are made of high-strength synthetic fibers; the spacer yarn layer of the second geotextile uses core-spun yarn with biological curing function as spacer yarn fiber, and the high-strength synthetic fiber and the core-spun yarn with biological curing function are introduced into a Raschel double needle bed warp knitting machine together, 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, and then heating the raw material polypropylene 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 layer and inner layer nozzles respectively to form a core-spun yarn with a reasonable diameter size. After extrusion, the biogel will become the outer layer of the core-spun yarn, and the viscous plastic liquid will be solidified to become the core yarn part 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 body, the self-repairing high-strength and high-durability geotextile is first folded in half along the center line to align the three side lines; a filling cuff is set at a certain distance on the long side line; then two or three sewing threads are laid along the aligned side lines of the self-repairing high-strength and high-durability geotextile, and the sewing threads are crossed and sewn up and down, and when the filling cuff passes through the contact 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-healing high-strength and high-durability geotextile to be used according to the coarseness of the sand particles in the application environment: if the filling soil is fine-grained soil and needs to be blown on site, use the first geotextile; if the filling soil is coarse sand and is blown 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 needs to be filled on site, the first geotextile 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, and 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 filtration functional layer through a needle punching process;

[0025] The high-strength synthetic fibers are overlapped and crossed up and down in the warp and weft directions by a warp knitting machine to weave into a grid-like structure to form a high-strength wear-resistant layer;

[0026] Then, the filtration functional layer is laid on the high-strength wear-resistant layer, and the two-layer structure is heated and pressed at some points distributed in an array by a hot compression molding machine, 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 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] The gel matrix, biocuring liquid, calcium chloride and urea are mixed and stirred to form biogel, and then the raw material polypropylene of the synthetic fiber is heated at a relatively low temperature to become a viscous plastic liquid, and then a dual-channel coaxial extrusion 3D printing device is used to extrude the biogel and the viscous plastic liquid from the outer layer and the inner layer nozzles respectively to form a core-spun yarn with a biocuring function. The diameter size of the core-spun yarn with a biocuring function is determined according to actual needs, and 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;

[0029] The high-strength synthetic fiber and the core-spun yarn with bio-curing function are introduced into a Raschel double needle bed warp knitting machine, and the warp knitting spacer fabric is formed by overall knitting 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 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 wires.

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

[0034] (III) Beneficial effects

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

[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 and 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 takes into full consideration 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, thereby 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 use of engineering structures;

[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 is initiated, 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 cuff of the present invention is installed at the seam of the edge of the filling bag body. Compared with the traditional filling bag body with holes opened on the bag body, the adverse effect on the strength and durability of the filling bag body is reduced, 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 drawings required for use in the embodiments will be briefly introduced below. 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 paying creative work.

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

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

[0045] Figure 3 It is a schematic diagram of the layers of the second geotextile of 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 specific implementation of the present invention is further described in detail below in conjunction with 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 clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] The following describes the implementation methods 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 implementation methods, 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 following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present 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 the present 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 drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0052] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0053] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0054] Embodiment 1:

[0055] like Figure 1-Figure 2As shown, the present invention provides a self-repairing high-strength and high-durability geotextile filling bag, including 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 by a sewing line 3; the self-repairing high-strength and high-durability geotextile 2 includes a first geotextile 2a, and the first geotextile 2a 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 function layer 2-1 and a high-strength wear-resistant layer 2-2 arranged in sequence from bottom to top, and, after being sewn into the filling bag body 1, the filtering function layer 2-1 is located on the inner side of the filling bag body 1.

[0056] In some embodiments, the synthetic fiber in the filter function layer 2-1 of the first geotextile 2a is polypropylene fiber, and its tensile strength is 800-1000MPa; the bio-curing functional fiber in the filter function layer 2-1 is a sodium alginate gel matrix, Bacillus pasteurianus liquid (OD600=1), calcium chloride and urea mixed and stirred in a ratio of 3:1:2:2 to form a bio-gel, and a single-channel extrusion 3D printing device is used to extrude the bio-gel from the nozzle to form the fiber. All the fibers of the above-mentioned filter function layer 2-1 are opened and mixed and then processed and formed by a needle punching process. The forming thickness of the filter function layer 2-1 is 5mm, so that it has the water permeability and anti-filtration functions of a general needle-punched geotextile, and the bio-curing functional fiber can be gradually decomposed and have a long-term bio-curing effect. The ratio of synthetic fiber to bio-curing functional fiber in the filter function layer 2-1 is 3:2.

[0057] In some embodiments, the high-strength synthetic fiber of the high-strength wear-resistant layer 2-2 of the first geotextile 2a is made of ultra-high molecular weight polyethylene (UHMWPE) filament fiber, and its tensile strength is 3000-3500 MPa; during warp knitting, the fibers overlap and pass up and down in the warp and weft directions to form a grid structure.

[0058] In some embodiments, the filtration functional layer 2-1 and the high-strength wear-resistant layer 2-2 of the first geotextile 2a are fixed together by local hot compression molding. The local hot compression molding refers to laying the prepared filtration functional 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 a matrix distribution point with a spacing of 3 cm, so that the synthetic fibers in the filtration 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 filtration functional layer 2-1 and the high-strength wear-resistant layer 2-2 of the first geotextile 2a as a whole, and the molding thickness of the first geotextile 2a is 6 mm.

[0059] In some embodiments, when the self-repairing high-strength and high-durability geotextile 2 is sewn with sewing lines 3 to form a filling bag body 1, the sewing lines 3 used for sewing are made of ultra-high molecular weight polyethylene (UHMWPE) filament fibers; the filling cuffs 4 are woven into geotextiles with polypropylene fibers and sewn into tubular cuffs. First, the self-repairing high-strength and high-durability geotextile 2 is folded in half along the center line so that the three side lines are aligned; a filling cuff 4 is set every 50 cm at the long side line; then three sewing lines 3 are laid along the aligned side lines of the self-repairing high-strength and high-durability geotextile 2, and the sewing lines are crossed and sewn up and down. When the filling cuffs 4 and the self-repairing high-strength and high-durability geotextile 2 are crossed at the contact point, the filling cuffs 4 and the self-repairing high-strength and high-durability geotextile 2 are sewn into a whole.

[0060] The present invention also provides a method for preparing a self-repairing high-strength and high-durability geotextile filling bag, comprising the following steps:

[0061] (I) Determine the type of self-repairing high-strength and high-durability geotextile 2 to be used according to the coarseness of the sand particles in the application environment: if the filling soil is fine-grained soil and needs to be filled on site, use the first geotextile 2a; if the filling soil is coarse sand and is filled on site or filled with dry sand in the factory, use the second geotextile 2b;

[0062] (II) When the filling soil is fine-grained soil and needs to be filled on site, prepare the first geotextile 2a: mix and stir the sodium alginate gel matrix, Bacillus pasteurianus liquid (OD600=1), calcium chloride and urea in a ratio of 3:1:2:2 to form a biogel, and use a single-channel extrusion 3D printing device to extrude the biogel from a nozzle to form a bio-curing functional fiber, the diameter of the bio-curing functional fiber is 0.6 mm; then, the polypropylene fiber and the bio-curing functional fiber are opened and mixed, and then processed into a filtration functional layer 2-1 with a thickness of 5 mm by a needle punching process;

[0063] The ultra-high molecular weight polyethylene (UHMWPE) filament fibers are overlapped and crossed up and down in the warp and weft directions by a warp knitting machine to weave into a grid structure to form a high-strength wear-resistant layer 2-2;

[0064] Then, the filter function layer 2-1 is laid on the high-strength wear-resistant layer 2-2, and the two-layer structure is heated and pressed at a matrix distribution point with a spacing of 3 cm by 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, and obtaining the first geotextile 2a with a thickness of 6 mm;

[0065] (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;

[0066] (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 on 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 cuff 4 into a self-repairing high-strength and high-durability geotextile filling bag.

[0067] 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 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.

[0068] Embodiment 2:

[0069] like Figure 1 , Figure 3 As shown, the present invention provides a self-repairing high-strength and high-durability geotextile filling bag, including 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 by a sewing line 3; the self-repairing high-strength and high-durability geotextile 2 includes a second geotextile 2b, and the second geotextile 2b is used for filling soil with 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 being sewn 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.

[0070] 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) filament fibers, and the tensile strength thereof is 3000-3500MPa; the core-spun yarn with biological curing function used in the spacer yarn layer 2-3 of the second geotextile 2b is prepared by mixing and stirring 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 biological gel, and then heating the polypropylene at a lower temperature to a viscous plastic liquid, and then using a dual-channel coaxial extrusion 3D printing device to extrude the biological gel and the viscous plastic liquid from the outer layer and the inner layer nozzle respectively to form a core-spun yarn with a reasonable diameter size, and after extrusion, the biological gel will become the outer layer of the core-spun yarn, and the viscous plastic liquid will solidify into the core yarn part of the core-spun yarn. The above fibers are introduced together into a Raschel double needle bed warp knitting machine, and the second geotextile 2b is formed by integrally knitting using a warp knitting interval weaving method, and the forming thickness is 6mm.

[0071] In some embodiments, when the self-repairing high-strength and high-durability geotextile 2 is sewn with sewing lines 3 to form a filling bag body 1, the sewing lines 3 used for sewing are made of ultra-high molecular weight polyethylene (UHMWPE) filament fibers; the filling cuffs 4 are woven into geotextiles with polypropylene fibers and sewn into tubular cuffs. First, the self-repairing high-strength and high-durability geotextile 2 is folded in half along the center line so that the three side lines are aligned; a filling cuff 4 is set every 50 cm at the long side line; then three sewing lines 3 are laid along the aligned side lines of the self-repairing high-strength and high-durability geotextile 2, and the sewing lines are crossed and sewn up and down. When the filling cuffs 4 and the self-repairing high-strength and high-durability geotextile 2 are crossed at the contact point, the filling cuffs 4 and the self-repairing high-strength and high-durability geotextile 2 are sewn into a whole.

[0072] The present invention also provides a method for preparing a self-repairing high-strength and high-durability geotextile filling bag, comprising the following steps:

[0073] (I) Determine the type of self-repairing high-strength and high-durability geotextile 2 to be used according to the coarseness of the sand particles in the application environment: if the filling soil is fine-grained soil and needs to be filled on site, use the first geotextile 2a; if the filling soil is coarse sand and is filled on site or filled with dry sand in the factory, use the second geotextile 2b;

[0074] (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:

[0075] 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 prepare a biogel, and then the raw material polypropylene of the synthetic fiber is heated at a relatively low temperature to a viscous plastic liquid, and then a dual-channel coaxial extrusion 3D printing device is used to extrude the biogel and the viscous plastic liquid from the outer layer and the inner layer nozzles, respectively, to prepare a core-spun yarn with a biocuring function. The diameter size of the core-spun yarn with a biocuring function is determined according to actual needs, and 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;

[0076] The ultra-high molecular weight polyethylene (UHMWPE) filament fiber and the core-spun yarn with biocuring function are introduced into a Raschel double needle bed warp knitting machine, and the second geotextile 2b is formed by the warp knitting interval weaving method, and the forming thickness is 6 mm;

[0077] (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;

[0078] (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 on 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 cuff 4 into a self-repairing high-strength and high-durability geotextile filling bag.

[0079] 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 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.

[0080] 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 it 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 the sand, 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 piled up to form a cofferdam, and the staggered overlap is required during laying. After the laying is completed, the microbial curing reaction gradually proceeds, continuously reinforcing the sand inside and around the filling bag, further protecting the engineering structure, and eventually becoming a permanent part of the structure.

[0081] The same and similar parts between the various embodiments in this specification can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0082] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope 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 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 sewing threads (3); the self-repairing high-strength and high-durability geotextile (2) comprises 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 filled on site by blowing; the second geotextile (2b) is used when the filling soil is coarse sand and needs to be filled on site by blowing 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; The first geotextile (2a) is composed of a filtering function 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 function layer (2-1) is located on the inner side of the filling bag body (1); 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 body (1), the warp-knitted high-strength geotextile (2-4) is located on the inner side of the filling bag body (1).

2. The self-repairing high-strength and high-durability geotextile filling bag according to claim 1 is characterized in that: The filtering functional layer (2-1) of the first geotextile (2a) is made of synthetic fibers and bio-cured functional fibers which are opened and mixed and then processed by a needle punching process; 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 extruding the bio-gel from a nozzle using a single-channel extrusion 3D printing device to form the fiber; wherein the gel matrix can be made of gelatin or sodium alginate, and the bio-curing liquid can be made of Bacillus pasteurianus liquid or soybean urease solution.

3. 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 according to 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.

4. The self-repairing high-strength and high-durability geotextile filling bag according to claim 1 is characterized in that: 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 filtering functional 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 filtering 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 filtering functional layer (2-1) and the high-strength wear-resistant layer (2-2) of the first geotextile (2a).

5. The self-repairing high-strength and high-durability geotextile filling bag according to claim 1 is characterized in that: 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 biocuring function as spacer yarn fibers, and the high-strength synthetic fibers and the core-spun yarns with a biocuring 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 substances 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 layer and the inner layer nozzles respectively to form a core-spun yarn with a reasonable diameter size. After extrusion, the biogel will become the outer layer of the core-spun yarn, and the viscous plastic liquid will be solidified to become the core yarn part of the core-spun yarn.

6. 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 with sewing lines (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 a certain distance at the long side line; and then two or three sewing lines (3) are arranged along the aligned side lines of the self-repairing high-strength and high-durability geotextile (2), and the sewing lines are passed through and sewn up and down. When the filling cuff (4) and the self-repairing high-strength and high-durability geotextile (2) are passed 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.

7. 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.

8. A method for preparing a self-repairing high-strength and high-durability geotextile filling bag, characterized in that: The steps include: (I) Determine the type of self-repairing high-strength and high-durability geotextile (2) to be used according to the coarseness of the sand particles in the application environment: if the filling soil is fine-grained soil and needs to be filled on site, use the first geotextile (2a); if the filling soil is coarse sand and needs to be filled 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 needs to be filled on site, prepare the first geotextile (2a): mix and stir the gel matrix, bio-curing liquid, calcium chloride and urea to form bio-gel, use a single-channel extrusion 3D printing device to extrude the bio-gel from a nozzle to form bio-curing functional fibers, and the diameter of the bio-curing functional fibers is determined according to actual needs; then, the synthetic fibers and the bio-curing functional fibers are opened and mixed and then processed into a filtration functional layer (2-1) by a needle punching process; The high-strength synthetic fibers are overlapped and crossed in the warp and weft directions by a warp knitting machine to form a grid structure to form a high-strength wear-resistant layer (2-2); The filtering functional 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 by a hot pressing machine, so that the synthetic fibers in the filtering 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 filtering functional 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): The gel matrix, biocuring liquid, calcium chloride and urea are mixed and stirred to form biogel, and then the raw material polypropylene of the synthetic fiber is heated at a relatively low temperature to become a viscous plastic liquid, and then a dual-channel coaxial extrusion 3D printing device is used to extrude the biogel and the viscous plastic liquid from the outer layer and the inner layer nozzles respectively to form a core-spun yarn with a biocuring function. The diameter size of the core-spun yarn with a biocuring function is determined according to actual needs, and 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; The high-strength synthetic fiber and the core-spun yarn with biocuring 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) 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.

9. The method for preparing the self-repairing high-strength and high-durability geotextile filling bag according to claim 8, 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 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 sewed into a self-repairing high-strength and high-durability geotextile filling bag; the sewing lines (3) are made of synthetic fiber wires.

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

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