U-shaped anchor rod wound by bamboo splits and preparation method of U-shaped anchor rod

Abstract

The invention provides a U-shaped anchor rod wound by bamboo splits and a preparation method of the U-shaped anchor rod, the U-shaped anchor rod is manufactured by orthogonally winding the bamboo splits soaked with a binder and then carrying out heat treatment, the two ends of the U-shaped anchor rod are U-shaped anchor heads, and the U-shaped anchor heads act on an anchored body after being connected with an anchoring agent during anchoring. According to the U-shaped anchor rod wound by the bamboo splits, the axial tensile strength of bamboo fibers is improved through longitudinal winding, the combining capacity of the surface of the rod body and an anchoring agent is enhanced through transverse winding, the manufacturing flexibility is high, the bamboo splits are wide in source, the processing technology is simple, and different engineering requirements are met; and the renewable resource bamboo wood is fully utilized, and the influence of a traditional metal anchor rod on the environment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to a U-shaped anchor rod wound with bamboo strips and a preparation method thereof. Background Art

[0002] With the advancement of ecological construction, green and environmentally friendly materials have gradually received attention in the field of civil engineering. Bamboo has become a potential candidate for new building materials due to its rapid growth and excellent tensile properties. However, bamboo has obvious defects, such as large discreteness of mechanical properties and bamboo joints weakening structural strength, which limits its application in load-bearing components.

[0003] In the prior art, bamboo anchors in various structural forms, such as wedge-shaped bamboo anchors and expansion shell bamboo anchors, have been proposed and applied to slope support, site protection, and other scenarios. However, these technical solutions are usually limited to improving the appearance of bamboo or using composite materials, but fail to give full play to the mechanical properties of bamboo itself. Therefore, a new method is urgently needed to optimize the mechanical properties and structural design of bamboo anchors. Summary of the invention

[0004] The purpose of the present invention is to provide a U-shaped anchor rod wrapped with bamboo strips and a preparation method thereof, which can give full play to the tensile properties of bamboo fibers and significantly improve the anchoring force of the anchor rod; improve the manufacturing quality and application performance of the bamboo anchor rod, and provide a green, environmentally friendly, economical and efficient anchor rod manufacturing and construction plan.

[0005] According to one purpose of the present invention, the present invention provides a U-shaped anchor rod wound with bamboo strips, which is made by winding bamboo strips soaked in an adhesive in an orthogonal manner and then heat-treating them. The two ends of the U-shaped anchor rod are U-shaped anchor heads, which are connected with the anchoring agent during anchoring and act on the anchored body.

[0006] Furthermore, the orthogonal winding includes longitudinal winding and transverse winding, the longitudinally wound bamboo strips are used to form a solid internal structure of the anchor head and the rod body, and the transversely wound bamboo strips are used to form a rough surface layer of the rod body.

[0007] Furthermore, the number of windings of the longitudinal winding determines the thickness of the U-shaped anchor head, the last layer of the transverse winding forms the rough surface of the anchor rod body, and the number of windings of the transverse winding and the longitudinal winding jointly determines the diameter of the rod body.

[0008] Furthermore, the binder includes epoxy resin, polyurethane resin or bio-based resin.

[0009] Furthermore, the heat treatment includes heating the U-shaped anchor rod to 150-200° C. and maintaining the temperature for 3-5 minutes to allow the adhesive to be bonded to the bamboo strips.

[0010] Furthermore, the diameter of the U-shaped anchor head is determined by the size of the fixed round end, and the diameter of the U-shaped anchor head is greater than the diameter of the rod body.

[0011] Furthermore, the bamboo strips include bamboo strips obtained by flattening and planing processed raw bamboo into bamboo strips with a width of 10-15 mm, a thickness of 1.0-1.5 mm, and a length greater than 1000 mm; or raw bamboo is directly peeled into bamboo strips; or raw bamboo is broken into bamboo strips and further woven into a large mesh bamboo strip with a width of 10-15 mm, a thickness of 1.0-1.5 mm, and a length greater than 1000 mm; or bamboo strips peeled from bamboo recombinant materials or bamboo integrated materials.

[0012] Furthermore, the longitudinal winding applies stress to the bamboo strips through a tension controller to remove air from the gaps between the layers.

[0013] Furthermore, the winding angle of the transverse winding is 0 to 45 degrees, the number of transverse windings is not less than three rounds, and stress is applied to the bamboo strips through a tension controller.

[0014] According to another object of the present invention, the present invention provides a method for preparing the above-mentioned U-shaped anchor rod, comprising the following steps:

[0015] S1. Preparation of bamboo strips

[0016] The original bamboo is processed into bamboo strips through the processes of removing knots, punching strips and planing;

[0017] S2. Winding method:

[0018] Orthogonal winding technology is used, with longitudinal winding forming the solid internal structure of the anchor head and the rod body, and transverse winding forming the rough surface of the rod body;

[0019] S3, bonding and heat treatment:

[0020] During the winding process, adhesive is used to fill the gaps between the bamboo strips, and consolidation is achieved through heat treatment.

[0021] The technical solution of the present invention utilizes a U-shaped anchor rod wound with bamboo strips. The longitudinal winding improves the axial tensile strength of the bamboo fiber, and the transverse winding enhances the bonding ability between the rod surface and the anchoring agent. The manufacturing flexibility is strong, the bamboo strips are widely available, the processing technology is simple, and it can adapt to different engineering needs. It is green and environmentally friendly, fully utilizes the renewable resource bamboo, and reduces the impact of traditional metal anchor rods on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the longitudinal winding of a U-shaped anchor rod according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the transverse winding of a U-shaped anchor rod according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of heat treatment of a U-shaped anchor rod according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the overall spatial structure of a U-shaped anchor rod according to an embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of a U-shaped anchor rod in anchoring construction according to an embodiment of the present invention.

[0028] In the figure: 1. bamboo strip tube; 2. bamboo strip tension controller; 3. adhesive; 4. pulley; 5. mechanical arm; 6. longitudinally wound bamboo strips; 7. U-shaped anchor fixed end; 8. transversely wound bamboo strips; 9. U-shaped anchor head; 10. rotating member; 11. U-shaped anchor; 12. anchor heater; 13. anchoring agent; 14. anchored body. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, 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 connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Example 1

[0033] The invention discloses a U-shaped anchor rod made of bamboo strips, which is made by winding bamboo strips soaked in an adhesive in an orthogonal manner and then heat-treating them. Both ends of the U-shaped anchor rod are U-shaped anchor heads, which are connected with an anchoring agent during anchoring and act on an anchored body.

[0034] Specifically, the anchor rod comprises longitudinally wound bamboo strips and transversely wound bamboo strips, the bamboo strips are bonded by adhesive coating and heat treated to form an integral anchor rod, and the anchor rod comprises a U-shaped anchor head for bearing pulling force and a rod body for anchoring.

[0035] The longitudinally wound bamboo strips are used to form a solid internal structure of the anchor head and the rod body, and the transversely wound bamboo strips are used to form a rough surface layer of the rod body.

[0036] The binder includes epoxy resin, polyurethane resin or bio-based resin.

[0037] The manufacturing method of the U-shaped anchor comprises the following steps:

[0038] 1. Preparation of bamboo strips:

[0039] The original bamboo is processed into bamboo strips through processes such as removing nodes, punching strips, and planing, with a width of 12mm, a thickness of 1.5mm, and a length of 1200mm;

[0040] 2. Winding method:

[0041] Orthogonal winding (combination of longitudinal winding and transverse winding) technology is adopted. The longitudinal winding forms the internal solid structure of the anchor head and the rod body, and the transverse winding forms the rough surface of the rod body; (during winding, the bamboo strips pass through two devices, the adhesive and the tension controller, which apply stress to expel the air between the layers while applying the adhesive between the winding layers);

[0042] 3. Bonding and heat treatment:

[0043] During the winding process, epoxy resin is used as a binder to fill the gaps between the bamboo strips, and consolidation is achieved through heat treatment;

[0044] 4. Construction application: The manufactured U-shaped anchor rod and anchoring agent are applied to the anchored body to ensure the structural stability of the slope or other anchored body.

[0045] The present invention utilizes a U-shaped anchor rod wound with bamboo strips, and the axial tensile strength of bamboo fibers is improved by longitudinal winding, and the bonding ability between the rod body surface and the anchoring agent is enhanced by transverse winding. The manufacturing flexibility is strong, the bamboo strips are widely available, the processing technology is simple, and it can adapt to different engineering requirements. It is green and environmentally friendly, and makes full use of renewable resources such as bamboo, reducing the impact of traditional metal anchor rods on the environment.

[0046] Specifically, the manufacturing method of the U-shaped anchor includes the following specific steps:

[0047] 1. Preparation of bamboo strips

[0048] Select bamboo with uniform texture and no obvious damage, remove the knots and use planing technology to obtain bamboo strips with uniform thickness, 12mm in width, 1.5mm in thickness and 1200mm in length;

[0049] The bamboo strips are spliced ​​in length according to the construction requirements and stored in bamboo strip tubes;

[0050] Carry out anti-corrosion treatment on bamboo strips to extend the service life of anchor rods.

[0051] 2. Longitudinal winding to form anchor head and solid internal structure

[0052] Apply prestress to the bamboo strips through a tension controller to remove air from the gaps between layers to ensure the tightness of the winding;

[0053] Use adhesive to coat the bamboo strips to ensure interlayer bonding;

[0054] Fix the bamboo strips to one end of the U-shaped anchor rod and wrap them longitudinally around the fixed end multiple times until an anchor head and a solid internal structure that meets the designed thickness are formed.

[0055] 3. Transverse winding to form the rod surface

[0056] After the longitudinal winding is completed, the bamboo strips are wound transversely layer by layer;

[0057] The lateral winding angle is controlled between 0 and 45 degrees to form a rod body with a rough surface;

[0058] Repeat the operation until the designed diameter is reached.

[0059] 4. Heat treatment to enhance overall performance

[0060] Place the wound U-shaped anchor rod in a heater and heat it at 150-160°C for 3-5 minutes;

[0061] The adhesive epoxy resin solidifies during the heat treatment process, further enhancing the overall structural properties of the bamboo strips.

[0062] The construction method of the U-shaped anchor comprises the following steps:

[0063] 1. Drill a hole in the anchored solid and clean the debris in the hole;

[0064] 2. Insert the manufactured U-shaped anchor into the hole and fill the pores with an anchoring agent, which has good shear strength and bonding properties;

[0065] 3. After the anchoring agent is cured, the anchor rod, anchoring agent and anchored body are integrally connected, and the construction is completed.

[0066] Example 2

[0067] like Figure 1-Figure 5 As shown, a U-shaped anchor rod using bamboo strips is provided, comprising longitudinally wound bamboo strips 6, transversely wound bamboo strips 8 and an adhesive 3. The longitudinally wound bamboo strips 6 eventually form a U-shaped anchor head 9 and an internal solid structure of the anchor rod. The U-shaped anchor head 9 realizes the pull-out resistance of the anchor rod, and the internal solid structure realizes the utilization of the axial tensile resistance of the bamboo fiber.

[0068] The transversely wound bamboo strips 8 and the solid structure inside the anchor rod together constitute the rod body of the anchor rod. Finally, the rod body and the U-shaped anchor head 9 constitute the overall structure of the bamboo anchor rod, and the transversely wound outermost layer of bamboo strips is the rod body surface, which interacts with the anchoring agent interface during anchoring.

[0069] The adhesive 3 is continuously applied on the surface of each layer of bamboo strips during the whole winding process, so that each layer of bamboo strips is connected together. The adhesive 3 uses resin, and the resin includes epoxy resin, polyurethane resin and bio-based resin. The adhesive 3 is used in conjunction with heat treatment technology to enhance the integrity and coordinated deformation ability of each bamboo strip.

[0070] Specifically, in this embodiment, the bamboo strips wound on the bamboo strip tube 1 are obtained by processing the original bamboo using the existing manufacturing process. The bamboo strips have high tensile strength and bending deformation capacity, which makes the U-shaped anchor rod 11 made by winding the bamboo strips have an anchoring force that meets the engineering requirements.

[0071] The preparation method of the U-shaped anchor rod comprises the following specific steps:

[0072] (1) Selecting old bamboo with uniform material and no surface damage, and processing it with a series of existing bamboo strip manufacturing technologies, obtain bamboo strips that can be used for winding, with a width of 10 mm, a thickness of 1.2 mm, and a length of 1500 mm, and splicing and rolling them in a bamboo strip tube 1, and performing antiseptic treatment.

[0073] (2) The bamboo strips in the bamboo strip tube are pulled out and passed through the bamboo strip tension controller 2 and the container filled with adhesive 3 to achieve stress loading and resin coating.

[0074] (3) Overlap the pulled bamboo strips on the pulley 4 and the U-shaped anchor fixed end 7. After the first longitudinal winding is completed using the robotic arm 5, the bamboo strips are repeatedly wound around the two U-shaped anchor fixed ends at the end of the instrument. After winding to the specified thickness of the U-shaped anchor head 9, the longitudinal winding is terminated.

[0075] (4) The extracted bamboo strips are bonded to one end of the U-shaped anchor rod body, and the rotating member 10 used for transverse winding begins to rotate around the axis. The inclination angle of the transverse winding is controlled by controlling the moving speed of the mechanical arm 5. The inclination angle is between 0 and 45 degrees. After the operation is repeated so that the rod diameter of the anchor rod meets the manufacturing requirements, the transverse winding is completed.

[0076] (5) The orthogonally wound anchor rod coated with adhesive 3 is heated by an anchor rod heater 12 to achieve sufficient bonding, realize coupling between bamboo strip layers and the interfaces of longitudinally and transversely wound bamboo strips, and further remove air from the rod.

[0077] When the U-shaped anchor rod of the present invention is used:

[0078] The U-shaped anchor rod 11 wrapped with bamboo strips is placed into the anchored body 14 with a hole drilled, and then the anchoring agent 13 is filled, and finally the U-shaped anchor rod 11 and the anchoring agent 13, and the anchoring agent 13 and the anchored body 14 are well connected to achieve the anchoring effect.

[0079] The present invention utilizes a U-shaped anchor rod wound with bamboo strips, and the axial tensile strength of bamboo fibers is improved by longitudinal winding, and the bonding ability between the rod body surface and the anchoring agent is enhanced by transverse winding. The manufacturing flexibility is strong, the bamboo strips are widely available, the processing technology is simple, and it can adapt to different engineering requirements. It is green and environmentally friendly, and makes full use of renewable resources such as bamboo, reducing the impact of traditional metal anchor rods on the environment.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A U-shaped anchor rod wound with bamboo strips, characterized in that: It is made of bamboo strips soaked in adhesive, which are wound in an orthogonal manner and then heat-treated. Both ends of the U-shaped anchor rod are U-shaped anchor heads, which are connected with the anchoring agent during anchoring and act on the anchored body.

2. The U-shaped anchor rod wound with bamboo strips according to claim 1 is characterized in that: The orthogonal winding includes longitudinal winding and transverse winding. The longitudinally wound bamboo strips are used to form a solid internal structure of the anchor head and the rod body, and the transversely wound bamboo strips are used to form a rough surface layer of the rod body.

3. The U-shaped anchor rod wound with bamboo strips according to claim 2 is characterized in that: The number of windings of the longitudinal winding determines the thickness of the U-shaped anchor head, the last layer of the transverse winding forms the rough surface of the anchor rod body, and the number of windings of the transverse winding and the longitudinal winding jointly determines the diameter of the rod body.

4. The U-shaped anchor rod wound with bamboo strips according to claim 1, characterized in that: The binder includes epoxy resin, polyurethane resin or bio-based resin.

5. The U-shaped anchor rod wound with bamboo strips according to claim 1, characterized in that: The heat treatment comprises heating the U-shaped anchor rod to 150-200° C. and maintaining the temperature for 3-5 minutes, so that the adhesive and the bamboo strips are fixed together.

6. The U-shaped anchor rod wound with bamboo strips according to claim 1, characterized in that: The diameter of the U-shaped anchor head is determined by the size of the fixed round end, and the diameter of the U-shaped anchor head is larger than the diameter of the rod body.

7. The U-shaped anchor rod wound with bamboo strips according to claim 1, characterized in that: The bamboo strips include bamboo strips obtained by flattening and planing processed raw bamboo; or raw bamboo strips directly peeled and cut into bamboo strips; or raw bamboo strips are broken into bamboo strips and further woven into mesh bamboo strips with a larger area; or bamboo strips peeled and cut from bamboo recombinant materials or bamboo integrated materials.

8. The U-shaped anchor rod wound with bamboo strips according to claim 2, characterized in that: The longitudinal winding applies stress to the bamboo strips through a tension controller to remove air from the gaps between the layers.

9. The U-shaped anchor rod wound with bamboo strips according to claim 2, characterized in that: The winding angle of the transverse winding is 0-45 degrees, the number of transverse windings is not less than three rounds, and stress is applied to the bamboo strips through a tension controller.

10. The method for preparing a U-shaped anchor rod using bamboo strips as claimed in claim 1, characterized in that: The steps include: S1. Preparation of bamboo strips The original bamboo is processed into bamboo strips through the processes of removing knots, punching strips and planing; S2. Winding method: Orthogonal winding technology is used, with longitudinal winding forming the solid internal structure of the anchor head and the rod body, and transverse winding forming the rough surface of the rod body; S3, bonding and heat treatment: During the winding process, adhesive is used to fill the gaps between the bamboo strips, and consolidation is achieved through heat treatment.

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