High-strength degradable geotechnical sand bag and preparation method thereof

Abstract

The invention discloses a high-strength degradable geotechnical sand bag which comprises geotechnical sand bag cloth, biological curing powder and filling sand. The geotechnical sand bag cloth comprises an inner wear-resistant layer, a natural degradable framework layer and an outer wear-resistant layer which are arranged in sequence. The inner wear-resistant layer is manufactured by drawing various degradable chemical fiber materials into fibers, carding the fibers into a net shape and adopting a needling process; the natural degradable framework layer takes high-strength plant fibers as raw materials and is tightly needled on the inner wear-resistant layer; the external wear-resistant layer is positioned on the other side of the natural degradable framework layer; the inner wear-resistant layer, the natural degradable framework layer and the outer wear-resistant layer are combined to form the soil engineering sand bag cloth through a hot melting and crimping process; the biological curing powder is arranged between the natural degradable skeleton layer and the external wear-resistant layer; the degradable soil engineering sand bag is formed by folding soil engineering sand bag cloth and sewing the soil engineering sand bag cloth, and the degradable soil engineering sand bag is filled with filling sand.

Description

Technical Field

[0001] The invention relates to the technical field of geosand bags, and in particular to a high-strength degradable geosand bag and a preparation method thereof. Background Art

[0002] Geotextile sandbags are widely used in coastal embankments, cofferdams, waterway management and other fields due to their low cost, easy material acquisition and flexible structure. Compared with traditional blocks, the use of geotextile sandbags greatly reduces the construction workload, shortens the construction period and saves engineering costs. The use of geotextile sandbags has become an economical and efficient method.

[0003] After the geotextiles are deployed, they usually remain in complex water or soil environments for a long time and are non-degradable due to engineering needs or high recycling difficulties. The geotextiles therein will become an important factor in environmental pollution. At the same time, the strength of geotextiles will decrease as the geotextiles are damaged when the geotextiles are in the natural environment for a long time. It can be seen that as the performance of geotextiles decreases, it becomes a material that pollutes the environment and is not conducive to engineering structures.

[0004] Therefore, in order to further optimize the relevant technologies of geosand bags, there is an urgent need for a green, low-carbon, self-solidifying and degradable geosand bag to address the problems of the non-degradability of existing geosand bags and the decrease in their strength over time. 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 high-strength degradable geosand bag and a preparation method thereof. The geosand bag body is composed of a three-layer structure, and the internal wear-resistant layer can effectively reduce the wear of the mud in the geosand bag on the natural degradable skeleton layer and the external wear-resistant layer, thereby improving the overall strength of the geosand bag body.

[0007] (II) Technical solution

[0008] The solution adopted by the present invention to solve the above technical problems is a high-strength degradable geosand bag, the degradable geosand bag comprises a geosand bag cloth, a biosolidification powder, and filling sand; the geosand bag cloth comprises an inner wear-resistant layer, a natural degradable skeleton layer, and an outer wear-resistant layer arranged in sequence;

[0009] The inner wear-resistant layer is made by drawing a variety of degradable chemical fiber materials into fibers, combing them into a mesh, and then using a needle punching process; the natural degradable skeleton layer is made of high-strength plant fibers and is tightly needled on the inner wear-resistant layer; the outer wear-resistant layer is located on the other side of the natural degradable skeleton layer;

[0010] The inner wear-resistant layer, the natural degradable skeleton layer, and the outer wear-resistant layer are combined to form the geosand bag fabric through a hot-melt pressing process;

[0011] The biological curing powder is placed between the natural degradable skeleton layer and the external wear-resistant layer; the biological curing powder is a mixture of curing bacterial powder, calcium chloride, and urea; and the bacterial species of the curing bacterial powder is facultative anaerobic Bacillus pasteurianus;

[0012] The degradable geosand bag is formed by folding the geosand bag cloth in half and sewing it, and the degradable geosand bag is filled with the filling sand;

[0013] When the degradable geosand bag is used for riverbed management, the degradable geosand bag is provided with sand-filled cuffs; and lifting ropes are sewn on both sides of the degradable geosand bag;

[0014] When the degradable geosand bag is used for the arrangement of bagged sand wells, the shape of the degradable geosand bag is consistent with the sand well, that is, a long strip.

[0015] Specifically, when the degradable geosand bags are used for riverbed management, the volume of the degradable geosand bags is relatively large; when the degradable geosand bags are used for the arrangement of bagged sand wells, the volume of the degradable geosand bags is relatively small.

[0016] In some embodiments, the inner wear-resistant layer is made of polyester thermoplastic polyurethane elastomer and polyhydroxyalkanoate as raw materials, which are melt-spun into filamentary fibers; and then made through the process of opening, carding, laying and three-needle punching of non-woven production equipment.

[0017] In some embodiments, the three-needling process is to first perform acupuncture evenly from top to bottom, and then perform the third acupuncture from top to bottom.

[0018] In some embodiments, the natural degradable skeleton layer is made of high-strength hemp plant fibers, which are randomly distributed by machine and tightly needle-punched onto the internal wear-resistant layer. Moreover, the natural degradable skeleton layer is needle-punched onto the internal wear-resistant layer to form pores.

[0019] Specifically, the high-strength hemp plant fiber is selected from jute, sisal, and abaca; the minimum size of the pores needs to meet the connection requirements of the internal wear-resistant layer 1-1 and the external wear-resistant layer 1-3.

[0020] In some embodiments, the external wear-resistant layer uses TPU and PHA as raw materials, which are melt-spun into filamentary fibers; the two fibers are woven in an overlapping and warp-weft manner to form a cross-linked grid structure.

[0021] In some embodiments, when making the degradable geosand bag, the inner wear-resistant layer is first placed in a machine for leveling, the natural degradable skeleton layer is then tightly needle-punched onto the surface of the inner wear-resistant layer, and biosolidification powder is spread on the degradable skeleton layer. Finally, the outer wear-resistant layer is superimposed on the natural degradable skeleton layer and hot-melt pressed at 120-170°C.

[0022] In some embodiments, the geotextile sandbag fabric and the lifting rope are sewn by overlocking, and the sewing thread is PLA fiber thread, and the sewing strength is not less than 70% of the original fabric strength.

[0023] The solution adopted by the present invention to solve the above technical problems is a method for preparing a high-strength degradable geosand bag, comprising the following steps:

[0024] When biodegradable geosandbags are used for river management:

[0025] Step (1) using a positioning device to determine the layout position of the geotextile sandbags;

[0026] Step (2) filling the geosandbags with sand near the construction area;

[0027] Step (3) using a filling device to lift the geosand bags and fill them in a designated area;

[0028] When biodegradable geosand bags are used for bagged sand well layout:

[0029] Step (1) driving a conduit into a designated construction area;

[0030] Step (2) inserting a geosand bag filled with sand into the conduit;

[0031] Step (3) removing the catheter;

[0032] Step (4) Repeat the above steps until all geosand bags are arranged.

[0033] In some embodiments, when the degradable geosand bags are used for mortar arrangement, in the step (1), the conduit is a cylindrical structure with an opening at one end and a cover at the other end that can only be opened from the inside. When inserted into the soil layer, the soil will be discharged to both sides.

[0034] (III) Beneficial effects

[0035] Compared with the prior art, the present invention designs a high-strength degradable geosand bag and a preparation method thereof.

[0036] (1) In the process of weaving and sewing the stitches, the materials used in the present invention include polyester thermoplastic polyurethane elastomers and polyhydroxyalkanoates and other new degradable materials. Not only does the produced degradable geosandbag have the excellent properties of these materials, but it also solves the environmental pollution problem left after the construction.

[0037] (2) The present invention uses biological solidification powder to induce the crystallization of insoluble carbonate on the surface of sand through the metabolism of Bacillus pasteurianus, thereby increasing the strength of sand, so that after the geosand bag is degraded, the construction structure still has a stable and complete structure, thus solving the problem of the loss of strength of the engineering structure after the geosand bag is degraded;

[0038] (3) The geosand bag body of the present invention adopts a three-layer structure, and the internal wear-resistant layer can effectively reduce the wear of the mud and sand in the geosand bag on the natural degradable skeleton layer and the external wear-resistant layer, thereby improving the overall strength of the geosand bag body;

[0039] (4) The provision of the natural degradable skeleton layer in the present invention improves the puncture resistance and tear resistance of the internal wear-resistant layer, thereby preventing the geosand bag from being torn prematurely after being filled with excessive mud and sand, resulting in local damage to the bag body. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 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.

[0041] Figure 1 This is a cross-sectional view of a high-strength biodegradable geosand bag;

[0042] Figure 2 It is a structural schematic diagram of a high-strength degradable geosand bag;

[0043] Figure 3 This is a cross-sectional view of a high-strength degradable geosand bag used for river management;

[0044] Figure 4 This is a layout diagram of a high-strength degradable geosand bag used for river management;

[0045] Figure 5 A schematic diagram of the structure of a high-strength degradable geosand bag used for arranging bagged sand wells;

[0046] Figure 6 A cross-sectional view of a high-strength degradable geosand bag used for arranging bagged sand wells;

[0047] FIG7( a ) is a schematic diagram of inserting a conduit into the soil during the construction of a bagged sand well;

[0048] FIG7( b ) is a schematic diagram of inserting geosand bags during the construction of bagged sand wells;

[0049] FIG7( c ) is a schematic diagram of pulling out the catheter during the construction of a bagged sand well;

[0050] Figure 7(d) is a schematic diagram of the arrangement of geosand bags after the construction of the bagged sand well is completed.

[0051] The names of the components corresponding to the various figure marks in the figure are: 1. Geotextile sandbag cloth; 1-1. Internal wear-resistant layer; 1-2. Natural degradable skeleton layer; 1-3. External wear-resistant layer; 2. Biosolidification powder; 3. Filling sand; 4. Filling cuff; 5. Lifting rope. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0059] like Figure 1-Figure 6 As shown, this embodiment provides a high-strength degradable geosand bag, the degradable geosand bag comprises a geosand bag cloth 1, a biosolidification powder 2, and a filling sand 3; the geosand bag cloth 1 comprises an inner wear-resistant layer, a natural degradable skeleton layer 1-2, and an outer wear-resistant layer 1-3 arranged in sequence;

[0060] The inner wear-resistant layer is made by drawing polyester thermoplastic polyurethane elastomer (TPU for short) and polyhydroxyalkanoate (PHA for short) into fibers, combing them into a mesh, and then using a needle punching process; the natural degradable skeleton layer 1-2 is made of jute fiber and is tightly needle-punched on the inner wear-resistant layer; the outer wear-resistant layer 1-3 is located on the other side of the natural degradable skeleton layer 1-2; wherein the inner wear-resistant layer, the natural degradable skeleton layer 1-2, and the outer wear-resistant layer 1-3 are combined to form the geosand bag fabric 1 through a hot-melt pressing process;

[0061] After the geotextile sandbag cloth 1 is manufactured, the bio-curing powder 2 is filled between the natural degradable skeleton layer 1-2 and the external wear-resistant layer 1-3, and the filling port is sealed after the filling is completed; the bio-curing powder 2 is mixed with curing bacteria powder and a binder; the ratio of the curing bacteria powder and the binder is 1:1, the binder is a mixture of calcium chloride and urea, and the ratio of calcium chloride to urea is 1:4, and the strain of the curing bacteria powder is selected from facultative anaerobic Bacillus pasteurianus, and the concentration of Bacillus pasteurianus OD600=1.0;

[0062] The degradable geosand bag is formed by folding the geosand bag cloth 1 in half and sewing it together, and the degradable geosand bag is filled with the filling sand 3;

[0063] When the degradable geosand bag is used for riverbed management, the degradable geosand bag is provided with sand-filled cuffs; and lifting ropes 5 are sewn on both sides of the degradable geosand bag;

[0064] When the degradable geosand bag is used for the arrangement of bagged sand wells, the shape of the degradable geosand bag is consistent with the sand well, that is, a long strip.

[0065] Specifically, when the degradable geosand bags are used for riverbed management, the volume of the degradable geosand bags is relatively large; when the degradable geosand bags are used for the arrangement of bagged sand wells, the volume of the degradable geosand bags is relatively small.

[0066] In some embodiments, the inner wear-resistant layer is made of polyester thermoplastic polyurethane elastomer (TPU) and polyhydroxyalkanoate (PHA) as raw materials, which are mixed in a ratio of 1:2 and melt-spun to form filamentous fibers; and then formed through a process of opening, combing, web laying, and three-pass needling of non-woven production equipment. Specifically, the three-pass needling process is to firstly perform a uniform needling from top to bottom, and then perform a third needling from top to bottom.

[0067] In some embodiments, the natural degradable skeleton layer 1-2 is made of jute fiber, randomly distributed high-strength hemp plant fibers are mixed by machine and tightly needled onto the inner wear-resistant layer, and the natural degradable skeleton layer 1-2 is needled into the inner wear-resistant layer to form pores. Specifically, the minimum size of the pores needs to meet the connection requirements of the inner wear-resistant layer 1-1 and the outer wear-resistant layer 1-31-3.

[0068] In some embodiments, the external wear-resistant layer 1-3 uses TPU and PHA as raw materials, which are melt-spun after being mixed in equal proportions to form filamentary fibers; the two fibers are woven in an overlapping and warp-weft manner to form a cross-linked grid structure.

[0069] In some embodiments, when making the degradable geosand bag, the inner wear-resistant layer is first placed in a machine for leveling, and then the natural degradable skeleton layer 1-2 is tightly needle-punched to the surface of the inner wear-resistant layer, and the bio-solidification powder 2 is spread on the degradable skeleton layer, and finally the outer wear-resistant layer 1-3 is superimposed on the natural degradable skeleton layer 1-2, and hot-melt pressed at 120-170°C.

[0070] In some embodiments, the geotextile sandbag fabric 1 and the lifting rope 5 are sewn by overlocking, and the sewing thread is PLA fiber thread, and the sewing strength is not less than 70% of the original fabric strength.

[0071] like Figure 7(a)-Figure 7(d) As shown, this embodiment provides a method for preparing a high-strength degradable geosand bag, comprising the following steps:

[0072] When biodegradable geosandbags are used for river management:

[0073] Step (1) using a positioning device to determine the arrangement position of the geosand bags according to the construction plan;

[0074] Step (2) filling the geosandbags with sand near the construction area;

[0075] Step (3) using a filling device to lift the geosand bags and fill them in a designated area;

[0076] When biodegradable geosand bags are used for bagged sand well layout:

[0077] Step (1) driving a conduit into a designated construction area, wherein the conduit is a cylindrical structure with an opening at one end and a cover at the other end that can only be opened from the inside, and when the conduit is inserted into the soil layer, the soil will be pushed to both sides;

[0078] Step (2) filling a geosand bag on site, and inserting the geosand bag filled with sand into the conduit;

[0079] Step (3) removing the catheter;

[0080] Step (4) Repeat the above steps until all geosand bags are arranged.

[0081] In some embodiments, when the degradable geosand bags are used for mortar arrangement, in the step (1), the conduit is a cylindrical structure with an opening at one end and a cover at the other end that can only be opened from the inside. When inserted into the soil layer, the soil will be discharged to both sides.

[0082] 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.

[0083] 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 high-strength degradable geosand bag, characterized by: The degradable geosand bag comprises a geosand bag cloth (1), a biosolidification powder (2), and filling sand (3); the geosand bag cloth (1) comprises an inner wear-resistant layer, a natural degradable skeleton layer (1-2), and an outer wear-resistant layer (1-3) which are arranged in sequence; The inner wear-resistant layer is made by drawing a variety of degradable chemical fiber materials into fibers, combing them into a mesh, and then using a needle punching process; the natural degradable skeleton layer (1-2) is made of high-strength plant fibers and is tightly needle-punched on the inner wear-resistant layer; the outer wear-resistant layer (1-3) is located on the other side of the natural degradable skeleton layer (1-2); The inner wear-resistant layer, the natural degradable skeleton layer (1-2), and the outer wear-resistant layer (1-3) are combined to form the geosand bag fabric (1) through a hot-melt pressing process; The biological curing powder (2) is placed between the natural degradable skeleton layer (1-2) and the external wear-resistant layer (1-3); the biological curing powder (2) is formed by mixing curing bacterial powder and a binder; and the bacterial species of the curing bacterial powder is facultative anaerobic Bacillus pasteurianus; The degradable geosand bag is formed by folding the geosand bag cloth (1) in half and sewing it together, and the degradable geosand bag is filled with the filling sand (3); When the degradable geosand bag is used for riverbed management, the degradable geosand bag is provided with sand-filled cuffs; and lifting ropes (5) are sewn on both sides of the degradable geosand bag; When the degradable geosand bag is used for the arrangement of bagged sand wells, the shape of the degradable geosand bag is consistent with the sand well, that is, a long strip.

2. The high-strength degradable geosand bag according to claim 1, characterized in that: The inner wear-resistant layer is made of polyester thermoplastic polyurethane elastomer and polyhydroxyalkanoate as raw materials, which are melt-spun into filamentous fibers; and then made through the process of opening, combing, laying and three-needling of non-woven production equipment.

3. The high-strength degradable geosand bag according to claim 2, characterized in that: The process of the three-pass acupuncture is to first perform acupuncture evenly from top to bottom, and then perform the third acupuncture from top to bottom.

4. The high-strength degradable geosand bag according to claim 1, characterized in that: The natural degradable skeleton layer (1-2) is made of high-strength hemp plant fibers, which are randomly distributed by machine and tightly needled onto the internal wear-resistant layer. Moreover, the natural degradable skeleton layer (1-2) is needled onto the internal wear-resistant layer to form pores.

5. The high-strength degradable geosand bag according to claim 1, characterized in that: The outer wear-resistant layer (1-3) uses TPU and PHA as raw materials, which are melt-spun to become filamentous fibers; the two fibers are woven in a manner of overlapping each other and interlacing warp and weft to form a mutually cross-linked grid structure.

6. The high-strength degradable geosand bag according to claim 1, characterized in that: When the degradable geosand bag is manufactured, the inner wear-resistant layer is firstly placed in a machine for leveling, the natural degradable skeleton layer (1-2) is then tightly needle-punched onto the surface of the inner wear-resistant layer, and the biosolidification powder (2) is spread on the degradable skeleton layer, and finally the outer wear-resistant layer (1-3) is superimposed on the natural degradable skeleton layer (1-2), and hot-melt pressing is performed at 120-170°C.

7. The high-strength degradable geosand bag according to claim 1, characterized in that: The geotextile sandbag cloth (1) and the lifting rope (5) are sewn by using a wrapping process, and the sewing thread is a PLA fiber sewing thread, and the sewing strength is not less than 70% of the original fabric strength.

8. A method for preparing a high-strength degradable geosand bag, characterized in that: The following steps are involved: When biodegradable geosandbags are used for river management: Step (1) using a positioning device to determine the layout position of the geotextile sandbags; Step (2) filling the geosandbags with sand near the construction area; Step (3) using a filling device to lift the geosand bags and fill them in a designated area; When biodegradable geosand bags are used for bagged sand well layout: Step (1) driving a conduit into a designated construction area; Step (2) inserting a geosand bag filled with sand into the conduit; Step (3) removing the catheter; Step (4) Repeat the above steps until all geosand bags are arranged.

9. The method for preparing the high-strength degradable geosand bag according to claim 8, characterized in that: When the degradable geosand bags are used for mortar arrangement, in the step (1), the conduit is a cylindrical structure with an opening at one end and a cover at the other end that can only be opened from the inside. When inserted into the soil layer, the soil will be discharged to both sides.

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