A locally carbon fiber reinforced composite pole and a method for manufacturing the same

Abstract

The application discloses a kind of local carbon fiber reinforced composite material electric pole and preparation method thereof, including main pole body, and be arranged in the reinforcing layer of the main pole body predetermined axial interval;The material of the main pole body is glass fiber reinforced resin;The material of the reinforcing layer is carbon fiber reinforced resin;The predetermined axial interval is the area that electric pole is under the bending moment maximum in service state, including electric pole root area or by electric pole root to distance electric pole root length as electric pole total length 1 / 4 to 1 / 2 at least one continuous section in the local area of electric pole bending moment larger introduction high-performance carbon fiber reinforcing layer, to realize the significant promotion of lateral stiffness with the least carbon fiber usage, while maintaining the continuity and production efficiency of winding process;Carbon fiber reinforcing layer sets axial reinforcing layer and hoop reinforcing layer, give consideration to promote the bending stiffness and hoop stiffness of electric pole.

Description

Technical Field

[0001] This invention relates to the field of pole manufacturing technology, specifically to a partially carbon fiber reinforced composite pole and its manufacturing method. Background Technology

[0002] Composite material poles are gradually replacing traditional reinforced concrete poles, wooden poles, and steel pipe poles due to their advantages such as lightweight, high strength, corrosion resistance, good insulation performance, and convenient transportation and installation. Among them, glass fiber reinforced polymer (GFRP) composite material poles have relatively low cost and mature molding technology, and have been used to a certain extent in 10kV~110kV transmission and distribution lines.

[0003] However, the low elastic modulus is an inherent performance limitation of GFRP composites. The elastic modulus of glass fiber is typically 70–75 GPa, while that of the resin matrix is ​​only 3–5 GPa. The flexural modulus of the composite GFRP is usually between 20–40 GPa, far lower than that of steel (approximately 200 GPa). This causes GFRP poles to easily exhibit excessive deflection under lateral loads (such as wind loads, conductor tension, and wire breakage impact), severely affecting the electrical safety clearance and operational reliability of the line.

[0004] To address the problem of insufficient stiffness, existing technologies mainly employ the following solutions:

[0005] (1) Increase the wall thickness or diameter of the pole: This will significantly increase the amount of material used and the weight of the pole, weakening the lightweight advantage of composite material poles.

[0006] (2) Full carbon fiber reinforcement: The elastic modulus of carbon fiber composite material (CFRP) can reach more than 230 GPa, but the price of carbon fiber is 10 to 20 times that of glass fiber. The cost of full carbon fiber rod is too high, making it difficult to promote on a large scale in power grid projects. At the same time, the carbon fiber reinforcement in the existing technology is generally unidirectional reinforcement, which makes it difficult to take into account both bending stiffness and circumferential stiffness.

[0007] (3) Metal lining or reinforcing bars: such as embedding steel pipes or steel bars inside the pole, but this will introduce problems such as corrosion, insulation failure, and electromagnetic induction.

[0008] Therefore, how to accurately and efficiently improve the lateral stiffness of composite material poles without increasing costs is a technical challenge that urgently needs to be solved in this field. Summary of the Invention

[0009] This invention addresses the shortcomings of existing technologies by providing a locally carbon fiber reinforced composite pole and its preparation method. A high-performance carbon fiber reinforcement layer is introduced into the localized area of ​​the pole with a large bending moment, achieving a significant improvement in lateral stiffness with minimal carbon fiber usage, while maintaining the continuity of the winding process and production efficiency. The carbon fiber reinforcement layer comprises axial and circumferential reinforcement layers, thus improving both the bending stiffness and circumferential stiffness of the pole.

[0010] To address the aforementioned technical problems, the first aspect of the present invention provides a partially carbon fiber reinforced composite material pole, comprising a main pole body and a reinforcing layer disposed within a predetermined axial range of the main pole body;

[0011] The main rod is made of glass fiber reinforced resin; the reinforcing layer is made of carbon fiber reinforced resin.

[0012] The predetermined axial interval is the area where the pole experiences the greatest bending moment during service, including the pole root region or at least one continuous section from the pole root to a distance of 1 / 4 to 1 / 2 of the total pole length.

[0013] This invention introduces a high-performance carbon fiber reinforcement layer in local areas of the pole with large bending moments, achieving a significant improvement in lateral stiffness with minimal carbon fiber usage, while maintaining the continuity of the winding process and production efficiency.

[0014] Furthermore, the reinforcing layer includes a carbon fiber axial reinforcing layer and a carbon fiber circumferential reinforcing layer sleeved on the carbon fiber axial reinforcing layer;

[0015] In the carbon fiber axial reinforcement layer, the angle between the length direction of the carbon fiber and the axis of the pole is 0°~30°.

[0016] In the carbon fiber circumferential reinforcement layer, the angle between the length direction of the carbon fiber and the axis of the pole is 70°~90°.

[0017] The present invention comprises axially and circumferentially laid carbon fiber axial reinforcement layers and carbon fiber circumferential reinforcement layers. The carbon fiber axial reinforcement layers are used to directly resist the tensile and compressive stresses generated by bending and improve the bending stiffness. The carbon fiber circumferential reinforcement layers are used to improve the circumferential stiffness and buckling resistance of the pole and prevent local instability.

[0018] Furthermore, within the predetermined axial range, the thickness of the reinforcing layer exhibits a gradient structure: the thickness of the reinforcing layer is greatest at the location of maximum bending moment, and gradually decreases along the direction away from this location, with a thickness gradient change rate ≤ 0.35 mm / m; the gradient structure can avoid stress concentration at the boundary of the reinforcing layer, preventing interface peeling or delamination failure.

[0019] The thickness of the reinforcing layer accounts for 5-35% of the total wall thickness of the corresponding cross-section of the pole. When the reinforcement ratio is less than 5%, the stiffness improvement effect is not significant; when it is higher than 35%, the carbon fiber utilization rate decreases, and the cost-effectiveness ratio decreases. Preferably, the carbon fiber is selected from the T700 and T800 series high-modulus carbon fibers, with an elastic modulus of not less than 230 GPa and a tensile strength of not less than 3500 MPa.

[0020] Furthermore, the axial length l of the reinforcing layer satisfies: l ≥ 1.5 × l0, where l0 is the axial length of the region where the bending moment of the pole exceeds 80% of the peak bending moment point; the distance between the location of the maximum thickness of the reinforcing layer and the location of the peak bending moment point of the pole is ≤ 50 mm. Specifically, a finite element model of the pole is established using finite element analysis software (such as ANSYS, Abaqus), and rated wind load, maximum conductor tension load, and wire breakage impact load are applied to calculate the bending moment distribution curve along the axial direction of the pole. The placement location of the carbon fiber reinforcing layer is determined using 80% of the peak bending moment point as the threshold.

[0021] Furthermore, the main rod body includes a glass fiber underlayer and a glass fiber outer layer sleeved on the glass fiber underlayer, and the reinforcing layer is disposed between the glass fiber underlayer and the glass fiber outer layer.

[0022] Furthermore, an interface toughening layer is provided at the interface between the glass fiber bottom layer and the glass fiber outer layer and the reinforcing layer; the thickness of the toughening layer is 0.05-0.2 mm. Due to the differences in the coefficient of thermal expansion and surface chemical properties between carbon fiber and glass fiber, interfacial stress is easily generated during co-curing. The interface toughening layer is selected from a nano-silica modified epoxy resin layer (to improve interfacial toughness) or a thermoplastic polyamide nonwoven fabric layer (to dissipate strain energy through plastic deformation).

[0023] A second aspect of the present invention provides a method for preparing the partially carbon fiber reinforced composite electric pole described in the first aspect, comprising the following steps:

[0024] S1. Glass fibers impregnated with resin are wound around the surface of the mold core coated with a release agent (selected from silicone grease, polytetrafluoroethylene emulsion or water-based release agent) to form a glass fiber underlayer.

[0025] S2. Within a predetermined axial range, resin-impregnated carbon fibers are laid sequentially along the axial and circumferential directions on a glass fiber substrate to form a carbon fiber axial reinforcement layer and a carbon fiber circumferential reinforcement layer.

[0026] S3. Glass fibers impregnated with resin are wound around the glass fiber underlayer outside the carbon fiber circumferential reinforcement layer and the predetermined axial interval to form a glass fiber outer layer.

[0027] S4. After heating and curing in a curing oven, demold to obtain the partially carbon fiber reinforced composite material pole.

[0028] Furthermore, in S1 and S3, the winding direction of the glass fiber makes an angle of 45°-70° with the axis of the pole, and the winding tension of the glass fiber is 10-50N.

[0029] Furthermore, in S2, the thickness of a single layer of axially laid resin-impregnated carbon fiber is 0.1-0.3 mm, and 1-8 layers are laid; the thickness of a single layer of circumferentially laid resin-impregnated carbon fiber is 0.1-0.2 mm, and 1-6 layers are laid.

[0030] Furthermore, before S2, the surface of the glass fiber substrate is subjected to plasma treatment or mechanical grinding to roughen it, so that the surface roughness reaches 0.5~3 μm, and then an interface toughening layer is coated; after S2, an interface toughening layer is coated on the surface of the carbon fiber circumferential reinforcement layer.

[0031] The beneficial effects of this invention are:

[0032] This invention introduces carbon fiber only in the root or lower middle region of the pole where the bending moment is large. The amount of carbon fiber used is only 5% to 15% of the total carbon pole, achieving a significant improvement in bending stiffness and circumferential stiffness with minimal carbon fiber usage. At the same time, it still maintains the advantages of GFRP material such as light weight, high strength, insulation, and corrosion resistance.

[0033] The reinforcing layer of this invention adopts a gradient thickness design, and an interface toughening layer is set at the same time. This eliminates the abrupt change in stiffness between the reinforced area and the non-reinforced area, prevents interface failure modes such as delamination and peeling, and improves the overall reliability and fatigue life of the pole.

[0034] This invention is based on the existing fiber winding process and only requires the addition of a local carbon fiber laying device (automatic laying head or manual laying station). It does not require modification of the main production line and is suitable for the technological upgrade of existing composite material pole manufacturing enterprises.

[0035] This invention can flexibly adjust the position, thickness, and layup direction of the carbon fiber reinforcement layer according to different voltage levels, different meteorological conditions (basic wind speed, ice thickness), and different rod types to achieve reinforcement as needed. Attached Figure Description

[0036] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic cross-sectional view of a predetermined axial section of the partially carbon fiber reinforced composite pole of the present invention;

[0038] Figure 2 This is a schematic diagram of the axial and circumferential laying directions of the carbon fiber in this invention;

[0039] Figure 3 This is a schematic diagram of the reinforcement layer laying position according to the present invention;

[0040] The labels in the diagram are as follows: 1. Mold core, 2. Glass fiber bottom layer, 3. Carbon fiber axial reinforcement layer, 4. Carbon fiber circumferential reinforcement layer, 5. Glass fiber outer layer, 6. Interface toughening layer. Detailed Implementation

[0041] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In this invention, unless otherwise stated, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are merely for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this patent can be understood according to the specific circumstances.

[0043] Reference Figure 1 As shown, this embodiment relates to a locally carbon fiber reinforced composite pole, including a main pole body and a reinforcing layer disposed within a predetermined axial range of the main pole body; the main pole body is made of glass fiber reinforced resin; the reinforcing layer is made of carbon fiber reinforced resin; the predetermined axial range is the area where the pole experiences the greatest bending moment in service, including the pole root region or at least one continuous section from the pole root to a distance of 1 / 4 to 1 / 2 of the total pole length. This embodiment introduces a high-performance carbon fiber reinforcing layer in the localized area of ​​the pole with a large bending moment, achieving a significant improvement in lateral stiffness with minimal carbon fiber usage, while maintaining the continuity of the winding process and production efficiency.

[0044] In a preferred embodiment, the reinforcing layer includes a carbon fiber axial reinforcing layer 3 and a carbon fiber circumferential reinforcing layer 4 sleeved on the carbon fiber axial reinforcing layer 3; in the carbon fiber axial reinforcing layer 3, the angle between the length direction of the carbon fiber and the axis of the pole is 0°~30°; in the carbon fiber circumferential reinforcing layer 4, the angle between the length direction of the carbon fiber and the axis of the pole is 70°~90°, for reference. Figure 2 As shown in the figure, this embodiment is provided with axially and circumferentially laid carbon fiber axial reinforcement layer 3 and carbon fiber circumferential reinforcement layer 4. The carbon fiber axial reinforcement layer 3 is used to directly resist the tensile and compressive stress generated by bending and improve the bending stiffness; the carbon fiber circumferential reinforcement layer 4 is used to improve the circumferential stiffness and buckling resistance of the pole and prevent local instability.

[0045] In a preferred embodiment, within the predetermined axial range, the thickness of the reinforcing layer exhibits a gradient structure: the thickness is greatest at the location of maximum bending moment, and gradually decreases away from this location, with a thickness gradient change rate ≤ 0.35 mm / m. This gradient structure avoids stress concentration at the reinforcing layer boundaries, preventing interface peeling or delamination failure. The thickness of the reinforcing layer accounts for 5-35% of the total wall thickness of the corresponding cross-section of the pole. When the reinforcement ratio is below 5%, the stiffness improvement effect is not significant; when it is above 35%, the carbon fiber utilization rate decreases, and the cost-effectiveness ratio decreases. Preferably, the carbon fiber is selected from the T700 or T800 series of high-modulus carbon fibers, with an elastic modulus of not less than 230 GPa and a tensile strength of not less than 3500 MPa.

[0046] As a preferred embodiment, refer to Figure 3 The axial length *l* of the reinforcing layer satisfies: *l* ≥ 1.5 × *l0*, where *l0* is the axial length of the region where the bending moment of the pole exceeds 80% of the peak bending moment; the distance between the location of the maximum thickness of the reinforcing layer and the location of the peak bending moment of the pole is ≤ 50 mm. Specifically, a finite element model of the pole is established using finite element analysis software (such as ANSYS or Abaqus), and rated wind load, maximum conductor tension load, and wire breakage impact load are applied to calculate the bending moment distribution curve along the axial direction of the pole. The location of the carbon fiber reinforcing layer is determined using 80% of the peak bending moment as the threshold.

[0047] In a preferred embodiment, the main pole body includes a glass fiber underlayer 2 and a glass fiber outer layer 5 sleeved on the glass fiber underlayer 2, with the reinforcing layer disposed between the glass fiber underlayer 2 and the glass fiber outer layer 5. Preferably, the thickness of the glass fiber underlayer 2 is 30%-70% of the total wall thickness of the pole.

[0048] In a preferred embodiment, an interface toughening layer 6 is provided at the interface between the glass fiber bottom layer 2 and the glass fiber outer layer 5 and the reinforcing layer; the thickness of the toughening layer is 0.05-0.2 mm. Due to the differences in thermal expansion coefficients and surface chemical properties between carbon fiber and glass fiber, interfacial stress is easily generated during co-curing. The interface toughening layer 6 is selected from a nano-silica modified epoxy resin layer (to improve interfacial toughness) or a thermoplastic polyamide nonwoven fabric layer (to dissipate strain energy through plastic deformation).

[0049] Another embodiment of the method for preparing a locally carbon fiber reinforced composite pole includes the following steps:

[0050] S1. Glass fibers impregnated with resin are wound around the surface of the mold core 1 coated with a release agent (selected from silicone grease, polytetrafluoroethylene emulsion or water-based release agent) to form a glass fiber underlayer 2.

[0051] S2. Within a predetermined axial range, resin-impregnated carbon fibers are successively laid on the glass fiber substrate 2 along the axial and circumferential directions to form a carbon fiber axial reinforcement layer 3 and a carbon fiber circumferential reinforcement layer 4.

[0052] S3. Glass fibers impregnated with resin are wound around the carbon fiber circumferential reinforcing layer 4 and the glass fiber bottom layer 2 outside the predetermined axial interval to form a glass fiber outer layer 5.

[0053] S4. After heating and curing in a curing oven, demold to obtain the partially carbon fiber reinforced composite material pole.

[0054] In a preferred embodiment, in S1 and S3, the winding direction of the glass fiber makes an angle of 45°-70° with the axis of the pole, and the winding tension of the glass fiber is 10-50N. In S2, the thickness of a single layer of axially laid resin-impregnated carbon fiber is 0.1-0.3mm, and 1-8 layers are laid; the thickness of a single layer of circumferentially laid resin-impregnated carbon fiber is 0.1-0.2mm, and 1-6 layers are laid.

[0055] As a preferred embodiment, before S2, the surface of the glass fiber substrate is subjected to plasma treatment or mechanical grinding to roughen it so that the surface roughness reaches 0.5~3 μm, and then the interface toughening layer 6 is coated; after S2, the interface toughening layer 6 is coated on the surface of the carbon fiber circumferential reinforcement layer 4.

[0056] Example 1

[0057] This embodiment relates to the fabrication of a locally carbon fiber reinforced composite material pole, specifically:

[0058] Design parameters: Total pole length: 12 m; Top diameter: 190 mm; Root diameter: 320 mm (taper 1:75); Design wall thickness: 8 mm (equal wall thickness); Design wind speed: 30 m / s (basic wind pressure 0.55 kN / m²). 2 ).

[0059] Conductor type: LGJ-120 / 20, horizontal span 80 m, vertical span 100 m.

[0060] Materials: Glass fiber (E-glass, elastic modulus 72 GPa), carbon fiber (T700, elastic modulus 230 GPa), resin (bisphenol A type epoxy resin, E51);

[0061] Preparation process:

[0062] (1) Clean the conical steel core mold and apply water-based release agent.

[0063] (2) Bottom layer winding: Wet winding is used, with glass fiber impregnated with bisphenol A epoxy resin. The resin curing agent is an anhydride type, and the curing ratio is 1:1.14. The winding angle is 55°, the winding tension is 30 N, and the winding thickness is 4 mm to obtain the glass fiber bottom layer 2.

[0064] (3) Surface treatment: The surface of the glass fiber bottom layer 2 is subjected to plasma treatment (power 800 W, time 60 s) to make the surface roughness reach 1 μm, and a thermoplastic polyamide nonwoven fabric interface toughening layer 6 (SWA120, Shanghai Xingxia Polymer Products Co., Ltd.) with a thickness of 0.1 mm is laid.

[0065] (4) Carbon fiber laying: In the area 0~3.5 m from the base of the pole, first lay 4 layers of resin-impregnated carbon fiber axially (0° direction, single layer thickness 0.2 mm, total thickness 0.8 mm); then lay 2 layers of resin-impregnated carbon fiber circumferentially (90° direction, single layer thickness 0.15 mm, total thickness 0.3 mm), and then lay the thermoplastic polyamide nonwoven fabric interface toughening layer 6 with a thickness of 0.1 mm; the total thickness of carbon fiber is 1.1 mm, accounting for 13.75% of the total wall thickness (8 mm) in this area. Thickness distribution: 1.1 mm at the base, and linearly thins to a single layer of axial and a single layer of circumferential carbon fiber at 3.5 m (total carbon fiber thickness 0.35 mm).

[0066] (5) Outer layer winding: Continue winding the glass fiber layer with the same parameters until the total wall thickness is 8 mm.

[0067] (6) Curing: Curing is carried out according to the procedure of 80℃ / 1h→120℃ / 2h→150℃ / 2h, followed by natural cooling.

[0068] (7) Demolding, cutting, grinding, and spraying with UV-resistant topcoat to obtain a partially carbon fiber reinforced composite pole.

[0069] In summary, this invention introduces carbon fiber only in the root or lower-middle region of the pole where bending moment is high, with the amount of carbon fiber used being only 5% to 15% of the total carbon pole. This achieves a significant improvement in bending stiffness and circumferential stiffness with minimal carbon fiber usage. Simultaneously, it retains the advantages of GFRP material, such as light weight, high strength, insulation, and corrosion resistance. The reinforcing layer adopts a gradient thickness design, and an interface toughening layer 6 is set to eliminate abrupt stiffness changes between the reinforced and unreinforced areas, preventing interface failure modes such as delamination and peeling, thus improving the overall reliability and fatigue life of the pole. Based on existing fiber winding technology, only a local carbon fiber laying device (automatic laying head or manual laying station) needs to be added, without modifying the main production line, making it suitable for the technological upgrade of existing composite material pole manufacturers. The position, thickness, and layup direction of the carbon fiber reinforcing layer can be flexibly adjusted according to different voltage levels, meteorological conditions (basic wind speed, icing thickness), and bending moment distribution characteristics of different pole types, achieving reinforcement as needed.

[0070] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A locally carbon fiber reinforced composite pole, characterized in that, It includes a main rod body and a reinforcing layer disposed within a predetermined axial range of the main rod body; The main rod is made of glass fiber reinforced resin; the reinforcing layer is made of carbon fiber reinforced resin. The predetermined axial interval is the area where the pole experiences the greatest bending moment during service, including the pole root region or at least one continuous section from the pole root to a distance of 1 / 4 to 1 / 2 of the total pole length.

2. The partially carbon fiber reinforced composite pole as described in claim 1, characterized in that, The reinforcing layer includes a carbon fiber axial reinforcing layer and a carbon fiber circumferential reinforcing layer sleeved on the carbon fiber axial reinforcing layer; In the carbon fiber axial reinforcement layer, the angle between the length direction of the carbon fiber and the axis of the pole is 0°~30°. In the carbon fiber circumferential reinforcement layer, the angle between the length direction of the carbon fiber and the axis of the pole is 70°~90°.

3. The partially carbon fiber reinforced composite pole as described in claim 1, characterized in that, Within the predetermined axial range, the thickness of the reinforcing layer exhibits a gradient structure: the thickness of the reinforcing layer is greatest at the location of maximum bending moment, and gradually decreases along the direction away from this location, with a thickness gradient change rate ≤ 0.35 mm / m; The thickness of the reinforcing layer accounts for 5-35% of the total wall thickness of the corresponding cross section of the pole.

4. The partially carbon fiber reinforced composite pole as described in claim 1, characterized in that, The axial length l of the reinforcing layer satisfies: l≥1.5 × l0, where l0 is the axial length of the region where the bending moment of the pole exceeds 80% of the peak bending moment point; The distance between the location of the maximum thickness of the reinforcing layer and the location of the peak bending moment of the pole is ≤50mm.

5. The partially carbon fiber reinforced composite pole as described in claim 1, characterized in that, The main body includes a glass fiber underlayer and a glass fiber outer layer sleeved on the glass fiber underlayer, and the reinforcing layer is disposed between the glass fiber underlayer and the glass fiber outer layer.

6. The partially carbon fiber reinforced composite pole as described in claim 5, characterized in that, An interface toughening layer is provided at the interface between the glass fiber bottom layer and the glass fiber outer layer and the reinforcing layer; the thickness of the toughening layer is 0.05-0.2 mm.

7. A method for preparing a partially carbon fiber reinforced composite material pole according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Glass fibers impregnated with resin are wound around the surface of the mold core coated with release agent to form a glass fiber underlayer; S2. Within a predetermined axial range, resin-impregnated carbon fibers are laid sequentially along the axial and circumferential directions on a glass fiber substrate to form a carbon fiber axial reinforcement layer and a carbon fiber circumferential reinforcement layer. S3. Glass fibers impregnated with resin are wound around the glass fiber underlayer outside the carbon fiber circumferential reinforcement layer and the predetermined axial interval to form a glass fiber outer layer. S4. After heating and curing in a curing oven, demold to obtain the partially carbon fiber reinforced composite material pole.

8. The method for preparing a locally carbon fiber reinforced composite pole as described in claim 7, characterized in that, In S1 and S3, the angle between the winding direction of the glass fiber and the axis of the pole is 45°-70°, and the winding tension of the glass fiber is 10-50N.

9. The method for preparing a locally carbon fiber reinforced composite electric pole as described in claim 7, characterized in that, In S2, the thickness of a single layer of resin-impregnated carbon fiber laid axially is 0.1-0.3 mm, and 1-8 layers are laid; the thickness of a single layer of resin-impregnated carbon fiber laid circumferentially is 0.1-0.2 mm, and 1-6 layers are laid.

10. The method for preparing a locally carbon fiber reinforced composite electric pole as described in claim 7, characterized in that, Before S2, the surface of the glass fiber substrate is subjected to plasma treatment or mechanical grinding to roughen it, so that the surface roughness reaches 0.5~3 μm, and then an interface toughening layer is coated. After S2, an interface toughening layer is coated on the surface of the carbon fiber circumferential reinforcement layer.

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