Die and method for preparing steel wire-FRP composite pipe

Abstract

The invention relates to a mold and method for preparing a steel wire-FRP composite pipe, and belongs to the field of FRP composite pipe manufacturing. The die comprises two coaxial end positioning plates arranged at intervals in the axial direction, a framework composed of three or more framework battens extending in the transverse direction and a steel wire mesh formed by spirally winding steel wires outside the framework. The end part positioning plate comprises a plate body and a plurality of slots which are formed in the peripheral wall of the plate body at intervals and extend along the radial direction of the plate body; the two transverse ends of each framework batten are inserted into the corresponding inserting grooves of the two end positioning plates. A steel wire mesh is adopted as a fiber winding or wet laying net-shaped outline; the framework with the adjustable shape is formed by the framework battens, operation is simple and easy, the requirement for shape diversity of the FRP composite pipes can be met, and the FRP composite pipes with various shapes can be prepared according to needs.

Description

Technical Field

[0001] The present application relates to the field of FRP composite pipe manufacturing, and in particular to a mold and a method for preparing a steel wire-FRP composite pipe. Background Art

[0002] The main components of FRP pipes are glass fiber and resin. As a composite pipe with corrosion resistance, light weight and high strength, FRP pipes have broad application prospects in chemical engineering, power engineering, marine engineering, construction engineering, road and bridge engineering, and municipal environmental engineering. For example, in the chemical industry, FRP pipes can be used to store or transport corrosive media; in the power industry, FRP pipes can be used as cable protection sleeves; in marine engineering, FRP pipes can be used as surface anti-corrosion layers; in the fields of construction engineering and road and bridge engineering, FRP pipes can also be used in engineering structural components or concrete pouring molds; in municipal environmental engineering, FRP pipes can be used as landscape models or water supply and drainage pipelines. Due to its corrosion resistance, light weight and high strength, FRP pipes have become one of the indispensable important materials in various industries, and the market demand continues to grow. The elastic modulus of pure FRP pipes is relatively low, and it is a linear elastic material with poor ductility. In order to improve the elastic modulus and ductility of pure FRP pipes, steel wires can be added to FRP pipes to form steel wire-FRP composite pipes.

[0003] FRP composite pipes have various shapes and can be customized according to different engineering requirements. FRP composite pipes can be round, oval, square or even variable cross-section, and can also be combined in sections as needed. This design with diverse shapes enables FRP composite pipes to meet the use requirements of different scenarios in various engineering fields. One of the keys to the production process of FRP composite pipes is the mold. Currently, circular steel pipe molds are mostly used, and they are mainly for circular FRP pipes. However, for irregular shapes, especially variable cross-section shapes, the production of FRP composite pipes is difficult and costly. It is mainly manifested in: for irregular-shaped FRP composite pipes, traditional steel molds are difficult to make and costly, requiring sheet metal, forging, cutting or welding and other steps; demolding is difficult, and molds with complex shapes are difficult to remove; a set of steel molds can only be used for FRP composite pipes of a specific shape, and it is difficult to adapt to the shape diversity requirements of FRP composite pipes. Summary of the invention

[0004] The purpose of the present application is to provide a mold and a method for preparing a steel wire-FRP composite pipe, which aims to solve the problem that the existing FRP composite pipe preparation mold is difficult to adapt to the requirements of product shape diversity to a certain extent.

[0005] In order to achieve the above application purpose, the technical solution adopted in this application is as follows:

[0006] Solution 1)

[0007] A mold for preparing a steel wire-FRP composite pipe, comprising two coaxial end positioning plates spaced apart in the axial direction, a skeleton composed of more than three skeleton strips extending in the transverse direction, and a steel wire mesh formed by spirally winding steel wires around the skeleton;

[0008] The end positioning plate comprises a plate body and a plurality of slots which are arranged at intervals on the outer peripheral wall of the plate body and extend in the radial direction of the plate body;

[0009] The two transverse ends of each frame strip are inserted into the corresponding slots of the two end positioning plates.

[0010] Specifically, a plurality of V-shaped teeth are provided at intervals along the transverse direction on one side edge of the width direction of the skeleton slat; and the included angle of each V-shaped tooth is greater than or equal to 60° and not greater than 120°.

[0011] Specifically, the diameter of the steel wire is not less than 0.8 times the opening width of the V-shaped teeth of the skeleton slats and is not greater than the opening width of the V-shaped teeth of the skeleton slats.

[0012] Specifically, the skeleton slats may be straight slats or curved slats.

[0013] Specifically, the breaking strain of the steel wire is not less than 0.1.

[0014] Specifically, the preparation mold for preparing the steel wire-FRP composite pipe also includes a rotating shaft, a through hole for passing the rotating shaft is provided in the center of the end positioning plate, and a limiting groove connected to the through hole is provided beside the through hole.

[0015] Option 2)

[0016] A method for preparing a steel wire-FRP composite pipe using the mold comprises the following steps:

[0017] S1: Install the two end positioning plates coaxially and spaced correspondingly;

[0018] S2: applying a release agent to the skeleton strips, and then installing the skeleton strips coated with the release agent on the slots of the end positioning plates respectively, and adjusting and fixing the positions of the skeleton strips to form the required skeleton shape according to the shape requirements of the composite pipe to be prepared;

[0019] S3: rotating the frame composed of the frame slats, and spirally winding the steel wire on the frame to form a steel wire mesh;

[0020] S4: Wet-laying or winding the fibers impregnated with the resin on the steel wire mesh;

[0021] S5: Wait for it to solidify to obtain the steel wire-FRP composite pipe.

[0022] Specifically, in step S2, when the skeleton strip coated with the release agent is installed on the slot of the end positioning plate, the side edge provided with the V-shaped teeth is arranged outward.

[0023] Specifically, in step S4, the angle between the steel wire direction and the fiber direction of the steel wire mesh is not less than 10°.

[0024] Compared with the prior art, the present invention has the following beneficial effects: the present invention uses a steel mesh as the mesh profile for fiber winding or wet laying; uses skeleton slats to form a skeleton with an adjustable shape, which is simple and easy to operate, and is used for irregular-shaped FRP composite pipes. Traditional steel molds are difficult to make and costly, and can adapt to the shape diversity requirements of FRP composite pipes, that is, FRP composite pipes with various shapes can be prepared as needed. The end positioning plate is used to not only facilitate the adjustment and fixing of the position of the skeleton slats at the end, but also facilitate demoulding and disassembly.

[0025] The preparation method of the present invention constructs skeletons of different shapes and sizes through the end positioning plates and the skeleton slats, uses the relatively smooth mesh profile formed by winding the elastic steel wire on the skeleton to replace the continuous surface profile of the traditional mold, and winds or wet-lays the fiber impregnated with resin on the steel mesh, thereby realizing the preparation of steel wire-FRP composite pipes of different shapes and sizes by a set of molds. The steel mesh is retained in the steel wire-FRP composite pipe, while the skeleton slats and the end positioning plates constituting the skeleton are easy to disassemble. The preparation method directly avoids the difficulties in processing, installing, disassembling and reusing molds of complex shapes, and the method is flexible and the process is simple, which is suitable for industrial large-scale production and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art 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 any creative work.

[0027] Figure 1 It is a structural schematic diagram of the mold of Example 1 of the present application (round steel wire-FRP composite pipe).

[0028] Figure 2 It is a schematic diagram of the structure of the end positioning plate of Example 1 of the present application.

[0029] Figure 3 It is a schematic diagram of the structure of the skeleton slats of Example 1 of the present application.

[0030] Figure 4It is a schematic diagram of the process of preparing a steel wire-FRP composite pipe according to Example 1 of the present application.

[0031] Figure 5 It is a structural schematic diagram of the mold of Example 2 of the present application (square steel wire-FRP composite tube).

[0032] Figure 6 It is a structural schematic diagram of the mold of Example 3 of the present application (oval steel wire-FRP composite tube).

[0033] Figure 7 It is a structural schematic diagram of the mold of Example 4 of the present application (truncated cone-shaped steel wire-FRP composite tube).

[0034] Figure 8 It is a structural schematic diagram of the mold of Example 5 of the present application (hourglass-shaped steel wire-FRP composite pipe).

[0035] Fig. 9 It is a schematic diagram of the structure of the skeleton slats of Example 5 of the present application.

[0036] Among them, the reference numerals in the figure are:

[0037] 1-skeleton slats; 2-wire mesh; 3-end positioning plate; 4-fiber impregnated with resin; 5-rotating shaft 6-rotating bracket; 7-motor; 8-steel wire-FRP composite pipe. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] In this application, the term "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0040] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b or c", or "at least one of a, b and c", can all represent: a, b, c, ab (i.e. a and b), ac, bc, or abc, where a, b, c can be single or multiple, respectively.

[0041] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0042] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0043] The term “FRP” is an abbreviation for “Fiber Reinforced Polymer”, which means fiber reinforced composite material.

[0044] This embodiment provides a mold for preparing a steel wire-FRP composite pipe, such as Figure 1 As shown, it comprises two end positioning plates 3 coaxially arranged at intervals in the axial direction, a frame composed of more than three frame strips 1 extending in the transverse direction, and a steel wire mesh 2 formed by steel wires spirally wound around the outside of the frame;

[0045] like Figure 2 As shown, the end positioning plate 3 includes a plate body 3-1, and a plurality of slots 3-2 which are spaced apart on the outer peripheral wall of the plate body 3-1 and extend along the radial direction of the plate body 3-1;

[0046] The two transverse ends of each frame slat 1 are inserted into the corresponding slots 3 - 2 of the two end positioning plates 3 .

[0047] The sizes and shapes of the skeleton slats 1, the steel wire mesh 2 and the end positioning plates 3 in the mold prepared in the embodiment of the present application can be selected from common specifications, and can be adjusted according to the required appearance and mechanical properties of the FRP composite pipe. The number of skeleton slats 1 is not less than 3, and can be 10, 12, or 24. The number of skeleton slats 1 can also be increased or decreased as needed. The more skeleton slats 1 there are, the more complex the skeleton shape can be constructed. However, the number of skeleton slats is not limited here.

[0048] The manufacturing process of traditional molds requires cold bending, sheet metal, casting or welding processes, and the processing technology is complicated. First, the wire mesh replaces the traditional mold surface as a mesh profile for fiber winding or wet laying. The steel wire is spirally wound on the skeleton composed of the skeleton slats to form the wire mesh. The wire mesh only needs to go through the process of cold bending of the steel wire. Therefore, the manufacturing method of the mold of the present invention is relatively simple and feasible.

[0049] Secondly, the skeleton slats are used to construct a skeleton for winding, fixing and supporting the steel wire mesh. The skeleton slats can be obtained by laser cutting, without going through more complicated sheet metal, bending, casting or welding processes, and the manufacturing method is simple. The thickness of the skeleton slats 1 is tightly matched with the slots 3-2. During installation, since the walls on both sides of the slots 3-2 have a certain elasticity, the position of the skeleton slats 1 in the slots 3-2 can be adjusted.

[0050] Finally, the end positioning plate is used to adjust and fix the position of the skeleton slats at the end. Compared with the clamp of the traditional mold, the end positioning plate not only has a fixing function, but also has the function of adjusting the position of the skeleton slats. In addition, a slot is provided to facilitate the installation and fixation of the skeleton slats. By adjusting the middle position of the skeleton slats in the slot of the end positioning plate, skeletons of different shapes can be obtained. The end positioning plate can be obtained by traditional cutting and processing methods, and the manufacturing method is simple. The use of the end positioning plate and the skeleton slats of the present invention in combination also facilitates demolding after molding.

[0051] During setting, the end positioning plate is provided with slots and the number of the slots is not less than the number of the frame slats, but the number of the slots and the number of the frame slats are not limited here.

[0052] In one embodiment, if Figure 3 As shown, a plurality of V-shaped teeth 1-1 are provided in the transverse direction on the side wall in a width direction of the skeleton slat 1; the angle of each V-shaped tooth 1-1 is greater than or equal to 60° and not greater than 120°. The angle of each V-shaped tooth 1-1 is not limited here, for example, it can be 60°, 70°, 80°, 90°, 100°, 110° or 120°. The V-shaped teeth 1-1 play a positioning function for the steel wire and can prevent the steel wire from slipping laterally. The arrangement of the tooth groove facilitates the fixation and positioning of the steel wire. The shape of the V-shaped teeth 1-1 facilitates the design and processing of the skeleton slat 1. The smaller the angle of the V-shaped teeth 1-1, the greater the influence of the smoothness of the steel wire mesh 2 on the installation accuracy of the steel wire. The larger the angle of the V-shaped teeth 1-1, the more likely the steel wire in the steel wire mesh 2 is to slip.

[0053] In one embodiment, the steel wire diameter is not less than 0.8 times the opening width of the V-shaped teeth 1-1 of the frame slats and not greater than the opening width of the V-shaped teeth 1-1 of the frame slats. This dimensioning can ensure that the V-shaped teeth 1-1 of the frame slats 1 can clamp the steel wire of the steel wire mesh 2. This dimensioning can effectively prevent the V-shaped teeth 1-1 from protruding beyond the steel wire mesh 2.

[0054] In one embodiment, the frame slats 1 may be straight or curved. The curved slats may be of any shape. The frame slats may be obtained by laser cutting, without going through more complicated sheet metal, bending, casting or welding processes, and the manufacturing method is simple.

[0055] In one embodiment, the breaking strain of the steel wire is not less than 0.1, so as to avoid the steel wire from being cold-bent and broken when it is spirally wound around the skeleton.

[0056] In one embodiment, the preparation mold of the steel wire-FRP composite pipe also includes a rotating shaft 5, and the center of the end positioning plate 3 is provided with a through hole 3-3 for passing the rotating shaft 5, and the side of the through hole 3-3 is provided with a limiting groove 3-4 connected to the through hole 3-3.

[0057] A through hole is provided in the center of the end positioning plate for passing the rotating shaft, and a limiting groove is also provided on the side of the through hole, which can not only prevent the end positioning plate from axial rotation, but also fix the relative position of the two end positioning plates, so as to facilitate the subsequent insertion of the skeleton slats.

[0058] like Figure 4 As shown, using the mold of the present invention to prepare a steel wire-FRP composite pipe includes the following steps:

[0059] S1: Install two end positioning plates 3 coaxially and spaced correspondingly; install the two end positioning plates 3 at both ends of the rotating shaft 5, and then fix the rotating shaft 5 on the rotating bracket 6.

[0060] S2: Apply a release agent to the skeleton slats 1, and then install the skeleton slats 1 coated with the release agent on the slots 3-2 of the end positioning plates 3, and adjust and fix the positions of the skeleton slats 1 to form the required skeleton shape according to the shape requirements of the composite pipe to be prepared;

[0061] S3: rotating the frame composed of the frame slats 1, and spirally winding the steel wires on the frame to form a steel wire mesh 2;

[0062] S4: Wet-laying or winding the fibers impregnated with resin on the steel wire mesh 2;

[0063] S5: Wait for it to solidify to obtain the steel wire-FRP composite pipe.

[0064] The position of the through slot of the frame strip 1 in the end positioning plate 3 can be determined according to the profile of the steel wire-FRP composite pipe. After the position is determined, the two ends of the frame strip 1 are fixed to prevent relative sliding between the frame strip 1 and the end positioning plate 3.

[0065] Specifically, in step S2, when the skeleton strip 1 coated with a release agent is installed on the slot 3-2 of the end positioning plate 3, the side edge provided with the V-shaped teeth 1-1 is arranged outward.

[0066] Specifically, in step S3, the motor of the rotating bracket drives the rotating shaft to rotate unidirectionally around the axis, and the steel wire is spirally wound around the frame composed of the frame strips 1. The surface of the steel wire is generally not coated with a release agent to ensure the bonding between the steel wire and the resin.

[0067] Specifically, in step S4, the steel wire direction and the fiber direction of the steel mesh are not parallel. The specific angle is not less than 10°. The angle between the winding direction of the steel wire of the steel mesh 2 and the fiber direction in the FRP composite pipe is set to be not less than 10°. The steel wires of the steel mesh 2 and the fiber directions in the fiber bundle or fiber cloth are made to intersect with each other so that the steel wires of the steel mesh 2 can support the fibers, thereby ensuring the effective winding or wet laying of the fibers. When performing fiber winding or wet laying operations, the steel mesh 2 can effectively provide support. In addition, the resin effectively bonds the steel wires and fibers, ensuring the strength and rigidity of the FRP composite pipe. After the fiber winding or wet laying operation, continue to rotate so that the resin is evenly distributed on the surface of the steel mesh under the action of centrifugal force and is not affected by gravity and is concentrated at the bottom until the resin is completely solidified.

[0068] In step S5, after the resin is solidified, the end positioning plate 3 and the frame strip 1 are removed in sequence. The steel mesh 2 is tightly combined with the fiber under the action of the resin and becomes a part of the steel wire-FRP composite pipe and remains therein.

[0069] The preparation method of the present invention constructs skeletons of different shapes and sizes through the end positioning plates and the skeleton slats, uses the relatively smooth mesh profile formed by winding the elastic steel wire on the skeleton to replace the continuous surface profile of the traditional mold, and winds or wet-lays the fiber impregnated with resin on the steel mesh, thereby realizing the preparation of steel wire-FRP composite pipes of different shapes and sizes by a set of molds. The steel mesh is retained in the steel wire-FRP composite pipe, while the skeleton slats and the end positioning plates constituting the skeleton are easy to disassemble. The preparation method directly avoids the difficulties in processing, installing, disassembling and reusing molds of complex shapes, and the method is flexible and the process is simple, which is suitable for industrial large-scale production and application.

[0070] In order to enable the above implementation details and operations of the present application to be clearly understood by those skilled in the art, as well as to demonstrate the significant improvement in the performance of the preparation mold and preparation method of the steel wire-FRP composite pipe in the embodiment of the present application, the above technical solution is illustrated by multiple embodiments below.

[0071] Example 1

[0072] like Figure 1As shown, the skeleton strips 1 of the mold for preparing the steel wire-FRP composite pipe of this embodiment are straight strips and the number of strips is 10, and the number of slots 3-2 is 90, wherein the skeleton strips 1 are inserted on the end positioning plate 3 at equal intervals, and the position of each skeleton strip 1 in the slot 3-2 is consistent. Finally, this embodiment can be used to prepare Figure 1 The cross section shown is a steel wire-FRP composite tube of circular shape.

[0073] Example 2

[0074] like Figure 5 As shown, the mold of this embodiment is different from that of embodiment 1 in that the number of skeleton slats 1 of this embodiment is 12, and the positions of the skeleton slats on the end positioning plate are different from those of embodiment 1. Specifically, the 12 skeleton slats 1 of this embodiment are divided into 4 groups, each group has 3 skeleton slats 1, which are inserted into the slots 3-2 of the end positioning plate 3 at equal intervals, and the skeleton slats 1 between each group are arranged at intervals of one slot 3-2, and the positions of each skeleton slat 1 in the slot 3-2 are consistent. Finally, this embodiment can be used to prepare the following Figure 5 The cross section shown is a steel wire-FRP composite tube of square shape.

[0075] Example 3

[0076] like Figure 6 As shown, the mold of this embodiment is different from that of embodiment 1 in that the number of skeleton slats 1 of this embodiment is 24, and the position of the skeleton slats on the end positioning plate is different from that of embodiment 1. Specifically, the 24 skeleton slats 1 of this embodiment are inserted into the slots 3-2 of the end positioning plate 3 at equal intervals, but the positions of the skeleton slats 1 in the slots 3-2 are inconsistent and the cross-section of the outer peripheral wall of the skeleton composed of the skeleton slats 1 is an elliptical steel wire-FRP composite tube.

[0077] Example 4

[0078] like Figure 7 As shown, the mold of this embodiment is the same as the mold of embodiment 1, except that the installation position of the skeleton strip 1 on the slot 3-2 of the end positioning plate 3 is different. The fixed position of the skeleton strip 1 on the slot 3-2 of the end positioning plate 3 on one side is close to the center of the end positioning plate 3, and the fixed position on the slot 3-2 of the end positioning plate 3 on the other side is close to the outer peripheral wall of the end positioning plate 3, and finally a mold capable of preparing as shown in FIG. Figure 7 The cross section shown is a truncated cone-shaped steel wire-FRP composite pipe whose cross section gradually increases from one side to the other side in the axial direction.

[0079] Example 5

[0080] like Figure 8As shown, the mold of this embodiment is different from the mold of Example 1 in that the skeleton strip 1 of the mold for preparing the steel wire-FRP composite pipe of this embodiment is curved, as shown in FIG. Fig. 9 As shown, it includes a connecting section and an upper convex section and a lower concave section integrally arranged between the connecting sections on both sides. The frame slats 1 of this embodiment include end positioning plates 3 arranged on both sides in the transverse direction, and the fixing positions are also different. Figure 8 The steel wire-FRP composite pipe shown is hourglass-shaped with a cross section that changes continuously along the axial direction.

[0081] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A mold for preparing a steel wire-FRP composite pipe, characterized in that: It comprises two coaxial end positioning plates (3) spaced apart in the axial direction, a frame composed of more than three frame strips (1) extending in the transverse direction, and a steel wire mesh (2) formed by steel wires spirally wound around the frame; The end positioning plate (3) comprises a plate body (3-1) and a plurality of slots (3-2) which are arranged at intervals on the outer peripheral wall of the plate body (3-1) and extend in the radial direction of the plate body (3-1); The two transverse ends of each frame strip (1) are inserted into corresponding slots (3-2) of the two end positioning plates (3).

2. A mold for preparing a steel wire-FRP composite pipe according to claim 1, characterized in that: A plurality of V-shaped teeth (1-1) are arranged at intervals along the transverse direction on one side edge in the width direction of the skeleton strip (1); the included angle of each V-shaped tooth (1-1) is greater than or equal to 60° and not greater than 120°.

3. A mold for preparing a steel wire-FRP composite pipe according to claim 2, characterized in that: The diameter of the steel wire is not less than 0.8 times the opening width of the V-shaped teeth (1-1) of the frame strip and is not greater than the opening width of the V-shaped teeth (1-1) of the frame strip.

4. A mold for preparing a steel wire-FRP composite pipe according to claim 1, characterized in that: The skeleton slats (1) are straight or curved slats.

5. A mold for preparing a steel wire-FRP composite pipe according to claim 1, characterized in that: The breaking strain of the steel wire is not less than 0.

1.

6. A mold for preparing a steel wire-FRP composite pipe according to claim 1, characterized in that: The mold for preparing the steel wire-FRP composite pipe also includes a rotating shaft (5), a through hole (3-3) for passing the rotating shaft (5) is provided at the center of the end positioning plate (3), and a limiting groove (3-4) connected to the through hole (3-3) is provided on the side of the through hole (3-3).

7. A method for preparing a steel wire-FRP composite pipe using the mold according to any one of claims 1 to 6, characterized in that: The steps include: S1: Install two end positioning plates (3) coaxially and spaced correspondingly; S2: applying a release agent to the skeleton strips (1), and then installing the skeleton strips (1) coated with the release agent on the slots (3-2) of the end positioning plates (3), and adjusting and fixing the positions of the skeleton strips (1) to form a desired skeleton shape according to the shape requirements of the composite pipe to be prepared; S3: rotating the frame composed of the frame slats (1) and spirally winding the steel wires on the frame to form a steel wire mesh (2); S4: wet-laying or winding the fibers impregnated with the resin on the steel wire mesh (2); S5: The fibers impregnated with the resin are solidified to obtain the steel wire-FRP composite pipe.

8. The method according to claim 7, characterized in that In step S2, when the skeleton strip (1) coated with a release agent is installed on the slot (3-2) of the end positioning plate (3), the side edge provided with the V-shaped teeth (1-1) is arranged outward.

9. The method according to claim 7, characterized in that: In step S4, the steel wire direction and the fiber direction of the steel wire mesh (2) are not parallel.

10. The method according to claim 9, characterized in that In step S4, the angle between the steel wire direction and the fiber direction of the steel wire mesh (2) is not less than 10°.

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