A bamboo-wound polymer composite pipe

Abstract

This utility model discloses a bamboo-wound polymer composite pipe, relating to the field of bamboo-woven pipes. The pipe body includes a radial bamboo-wound layer and an axial bamboo-wound layer. The radial bamboo-wound layer comprises a semi-circular first radial sheet and a second radial sheet, both ends of which are provided with a first spiral layer. The first spiral layer on the first radial sheet is in contact with the first spiral layer on the second radial sheet. Several second spiral layers are provided on the first and second radial sheets. The axial bamboo-wound layer comprises several bamboo strips arranged along the axis of the pipe body, which sequentially contact each other to form a circle. The first and second spiral layers are located between the radial and axial bamboo-wound layers, and are internally or externally tangent to both layers. This structure solves the problems of insufficient ring stiffness, weak axial tensile strength, easy delamination between layers, and poor environmental tolerance in traditional bamboo-wound pipes.

Description

Technical Field

[0001] This utility model relates to the field of pipelines, specifically to a bamboo-wound polymer composite pipe. Background Technology

[0002] Currently, in urban water supply and drainage, water conservancy, farmland irrigation, oil and wastewater treatment, industrial circulating water and other fields, the pipes used are generally steel pipes, ductile iron pipes, polyethylene pipes, polyvinyl chloride pipes, cement pipes, steel-lined cement pipes, fiberglass pipes, fiberglass reinforced sand pipes, etc.

[0003] Bamboo-wound composite pipes, as a new type of green pipeline material, possess advantages such as environmental friendliness and high strength. However, existing bamboo-wound composite pipes, such as the bamboo fiber wound composite pipe disclosed in CN200920121209.8, consist of an inner lining layer, a reinforcing layer, and an outer protective layer along the pipe diameter direction, with the reinforcing layer being a continuous bamboo fiber strip wound on the inner lining layer. However, bamboo fiber itself is a natural cellulose material, and its mechanical properties, such as tensile strength and elastic modulus, exhibit anisotropy. Circumferential winding mainly bears the circumferential stress generated by internal pressure, while helical winding needs to balance axial forces. However, if the winding angle (such as the helix angle) is improperly designed or the interlayer bonding force is insufficient, it can easily lead to interlayer shear failure, especially when the pipe is bent, vibrating, or experiencing temperature changes, resulting in a higher risk of interlayer delamination.

[0004] Another type of thermosetting bamboo-sand composite pressure pipe has, radially from the inside out, an inner lining layer, an inner reinforcing layer, a sand-adhesive layer, an outer reinforcing layer, and an outer protective layer. Between the inner lining layer and the outer protective layer, from the inside out, are an inner reinforcing layer made of bamboo strips wound together, a thickening layer made of mineral sand and adhesive, and an outer reinforcing layer made of bamboo strips wound together. The inner and outer reinforcing layers use bamboo strips wound in a simple circumferential or spiral direction, without being designed for axial stress, leading to easy deformation under axial tension and affecting the pipe's resistance to internal and external pressure and bending. Furthermore, the inner lining layer is made of bamboo fiber or bamboo knitted felt, and the outer waterproof resin is an organic material, which is easily flammable when exposed to open flame and releases a large amount of toxic gases, posing a significant safety hazard, especially when transporting petroleum or organic flammable liquids. Utility Model Content

[0005] One objective of this invention is to provide a bamboo-wound polymer composite pipe that increases the strength of the composite pipe by setting radial and axial bamboo winding layers.

[0006] This objective is achieved using the following technical solution:

[0007] A bamboo-wound polymer composite pipe includes a pipe body with at least one bamboo winding layer on its exterior. In use, depending on the actual application environment and the material of the pipe body, one or more bamboo winding layers can be selected to be installed on the exterior of the pipe body.

[0008] The bamboo winding layer comprises a radial bamboo winding layer and an axial bamboo winding layer from the inside out. The radial bamboo winding layer includes several sets of radial bamboo fiber sheets wound around the pipe body. Each radial bamboo fiber sheet includes a semi-circular first radial sheet and a second radial sheet, with a first helical layer at both ends of the first and second radial sheets. Within the same radial bamboo fiber sheet, the first helical layer on the first radial sheet is in contact with the first helical layer on the second radial sheet; within the same radial bamboo fiber sheet, the first and second radial sheets form a circle.

[0009] Secondly, in the same radial bamboo fiber sheet, a plurality of second spiral layers are provided on the first radial sheet and the second radial sheet, and the second spiral layers are externally tangent to the first radial sheet or the second radial sheet;

[0010] The axial bamboo wrapping layer includes several bamboo strips arranged along the axis of the pipe body, and the bamboo strips are in sequence to contact each other to form a circle.

[0011] The first and second spiral layers are located between the radial bamboo wrapping layer and the axial bamboo wrapping layer, and both the first and second spiral layers are internally or externally tangent to the radial and axial bamboo wrapping layers.

[0012] This structure forms a reinforced system through layered winding. The radial bamboo winding layer is formed by splicing semi-circular bamboo fiber sheets through the first and second radial sheets, forming a circumferential constraint to resist the radial stress generated by internal or external pressure. It can disperse the radial pressure to the entire circumference and improve the ring stiffness of the pipe.

[0013] The axial bamboo wrapping layer is made of bamboo strips laid along the pipeline axis, providing axial tensile strength to resist the pipeline's own weight, soil burial depth, or axial loads during media transportation. The bamboo strips in the axial bamboo wrapping layer are closely arranged along the axis, utilizing the high tensile strength of bamboo in the direction of the grain to effectively resist the axial drag force during pipeline laying and the risk of lateral compression buckling of the soil when buried deep.

[0014] The first and second spiral layers serve as transition layers, achieving spiral, circumferential, and axial stress transmission directions through inward or outward contact with radial and axial layers, thus avoiding stress concentration between layers. The first and second spiral layers can absorb impact energy, reducing the damage to the pipeline body from instantaneous loads and extending fatigue life.

[0015] Existing bamboo-wound pipes typically use a single winding direction, making them prone to localized deformation or breakage under high pressure or complex loads. In this structure, the radial bamboo winding layer, through the interlocking design of the semi-circular first radial sheet, second radial sheet, and first spiral layer, provides excellent radial strength to resist internal fluid pressure. The axial bamboo winding layer, with its continuous arrangement of axial bamboo strips, enhances axial tensile and bending resistance. Simultaneously, the second spiral layer is tangent to the first and second radial sheets, forming a cross-reinforcement network that disperses stress concentration points. When the pipe is subjected to internal water pressure, the circular structure formed by the first and second radial sheets ensures uniform stress distribution, while the first and second spiral layers reduce the risk of interlayer delamination.

[0016] Furthermore, existing pipes often leak at interfaces or between layers due to material mismatch or loose connections. This structure, by having the ends of the first and second radial sheets in the same radial bamboo fiber sheet contact each other through a first helical layer to form a sealing ring, ensures no gaps between the radial sheets; at the same time, the first and second helical layers are located between the radial and axial layers and are internally or externally tangent to them, enhancing the interfacial adhesion.

[0017] Existing pipelines are prone to fatigue cracking or delamination failure under cyclic loading. This structure, formed by a second helical layer and an overall circular enclosure, improves fatigue resistance: the second helical layer acts as a reinforcing rib, absorbing impact energy; the combination of radial and axial layers disperses dynamic stress and reduces stress concentration.

[0018] Additionally, the bamboo wrapping layer also includes a tung oil curing layer, which is located between the radial bamboo wrapping layer and the pipe body. The bamboo wrapping layer also includes a polyurea layer, with the tung oil curing layer located between the radial bamboo wrapping layer and the pipe body, and the polyurea layer located on the axial bamboo wrapping layer.

[0019] The tung oil curing layer is located between the pipe body and the radial bamboo wrapping layer. Tung oil, as a natural plant resin, has low viscosity and can deeply penetrate the microporous structure of bamboo fibers, replacing internal air and filling capillary channels. The tung acid in the tung oil undergoes an esterification reaction with bamboo cellulose, forming a hydrophobic protective film that blocks the intrusion paths of moisture, oxygen, and corrosive media, significantly reducing the moisture absorption and expansion rate of the bamboo. The tung oil curing layer forms a transition layer between the pipe body and the radial bamboo wrapping layer, enhancing interlayer adhesion strength and reducing the risk of interfacial delamination through a combination of chemical bonding and mechanical anchoring.

[0020] The cured tung oil layer possesses elastic deformation capabilities, which can absorb localized stress concentrations when the pipe is under pressure and inhibit the propagation of microcracks caused by the brittleness of bamboo fibers. Furthermore, the cured tung oil layer can reduce the shrinkage or expansion of bamboo caused by humidity changes, maintain the radial dimensional accuracy of the pipe, and prevent interlaminar shear failure due to deformation.

[0021] Secondly, tung oil is a renewable resource, non-toxic and biodegradable, meeting green building material standards, which can reduce the amount of epoxy resin used and reduce carbon emissions.

[0022] Polyurea coatings exhibit excellent resistance to UV aging, withstand high and low temperatures, and resist erosion from rain, snow, and sandstorms. They also demonstrate strong tolerance to acids, alkalis, salts, and oils, making them particularly suitable for corrosive environments such as chemical industrial parks, coastal saline soils, and landfill leachate.

[0023] A continuous, seamless protective layer is formed by the polyurea coating on the outer layer of axial bamboo wrapping, completely isolating external moisture, gases, and microorganisms, thus solving the problem of decay caused by long-term exposure of bamboo fibers. Furthermore, the high tear strength of the polyurea elastomer effectively resists the impact of gravel, mechanical scraping, and soil friction during construction and backfilling.

[0024] The high elongation of the polyurea coating allows it to distribute the load through elastic deformation when the pipeline is buried under pressure, preventing axial cracking of the bamboo strips due to localized stress. The external constraint effect also enhances the overall ring stiffness of the pipeline, suppressing the deformation tendency of the bamboo strip layer under high pressure.

[0025] Preferably, the width of the first radial sheet and the second radial sheet is 8-12 cm, and the thickness of the first radial sheet and the second radial sheet is 2.5-3.5 mm. The first radial sheet and the second radial sheet form a continuous arched structure during winding, which converts the radial pressure into the tensile stress of the bamboo fiber, improves the shear strength of the joint area, and prevents interlayer delamination.

[0026] The bamboo strips are 6-8cm wide and 1.5-2mm thick. Wider strips reduce the number of seams, improving production efficiency and structural integrity; a suitable thickness meets strength requirements while avoiding material waste. The outer diameters of the first and second spiral layers are the same, and the outer diameters of both the first and second spiral layers are less than or equal to 5-7mm.

[0027] The first and second spiral layers have the same outer diameter and are located between the radial and axial bamboo winding layers, being internally or externally tangent to both. This design not only precisely positions and secures the semi-circular pieces of the radial bamboo winding layer, preventing relative displacement under stress or environmental changes.

[0028] Furthermore, a filler layer is provided between the radial and axial bamboo-wrapped layers, comprising several bamboo or wood chips. Both the bamboo and wood chips are spherical, with a particle size less than or equal to 0.5 mm. This smaller particle size allows the bamboo and wood chips to fill the gaps between the radial and axial bamboo-wrapped layers more tightly, reducing voids and gaps within the filler layer. This helps form a continuous and structurally uniform intermediate layer, thereby better transferring stress, avoiding stress concentration, and improving the overall stability and consistency of the composite pipe structure. Uniform filling also ensures a more balanced physical and mechanical property of the composite pipe in different parts.

[0029] Along the axial direction of the pipe body, the straight lines at the centers of the first and second radial sheets of two adjacent radial bamboo fiber sheets are perpendicular to each other.

[0030] In existing bamboo-wound pipes, the radial bamboo fiber sheets are usually arranged in parallel or randomly, which can easily lead to stress concentration. However, in two vertically arranged adjacent radial bamboo fiber sheets, the first spiral layer of the first and second radial sheets contacts the first and second radial sheets of the other radial bamboo fiber sheet, and the circumferential staggered distribution can form continuous support in the circumferential direction, reduce local weaknesses, and further improve the pipe's resistance to bending and pressure.

[0031] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0032] This utility model discloses a bamboo-wound polymer composite pipe. The first and second radial plates of this structure form a circle, interlocked at both ends by a first spiral layer, creating a continuous arched pressure-bearing structure. This evenly distributes radial pressure throughout the circumference, significantly improving ring stiffness and avoiding the risk of localized deformation or breakage associated with traditional single-wound pipes.

[0033] The tung oil curing layer is located between the pipe body and the radial bamboo wrapping layer, enabling the tung oil to fill the micropores of the bamboo fiber, replace the air to form a hydrophobic film, and improve the interlayer bonding strength; the polyurea protective layer covers the outer surface of the axial bamboo wrapping layer to prevent the bamboo strips from cracking; the external constraint improves the overall ring stiffness.

[0034] Therefore, the bamboo-wound composite pipe of this structure solves the problems of insufficient ring stiffness, weak axial tensile strength, easy peeling between layers, and poor environmental tolerance of traditional bamboo-wound pipes through radial interlocking, axial continuity and spiral transition structure design, and through optimization by tung oil and polyurea filling.

[0035] This structure integrates the mechanical advantages of bamboo, namely high specific strength and tensile strength along the grain, with the protective properties of high polymers, namely tung oil penetration and polyurea sealing, to promote the development of green building materials while ensuring pipeline performance. It is especially suitable for pressure pipeline projects in water conservancy, municipal engineering, chemical industry and other fields. Attached Figure Description

[0036] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 This is a schematic diagram of the bamboo wrapping layer on the pipe body.

[0038] Figure 2 This is a schematic diagram of the structure of the first radial plate;

[0039] Figure 3 This is a schematic diagram showing the structure in which the first spiral layer on the first radial plate and the first spiral layer on the second radial plate are in contact with each other.

[0040] Figure 4 A schematic diagram of the structure in which the first and second radial plates are wound around the pipe body;

[0041] Figure 5 A schematic diagram of a circular structure in which bamboo strips of axial bamboo wrapping are arranged along the direction of the pipe body axis, and several bamboo strips contact each other in sequence.

[0042] Figure 6 This is a schematic diagram showing that the straight lines at the centers of the first and second radial sheets of two adjacent radial bamboo fiber sheets are perpendicular to each other.

[0043] Figure 7 This is a schematic diagram of the pipe preparation device.

[0044] The attached diagram shows the markings and corresponding component names:

[0045] 1-Pipe body, 2-Radial bamboo wrapping layer, 3-First spiral layer, 4-Second spiral layer, 5-Axial bamboo wrapping layer, 6-Tung oil curing layer, 7-Fixing ring, 8-Rotating ring, 9-Adjusting rod. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0047] In the description of this utility model, it should be understood that the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0048] Example 1

[0049] A bamboo-wound polymer composite pipe includes a pipe body 1, with at least one set of bamboo winding layers disposed on the outside of the pipe body 1. The number of bamboo winding layers is selected based on the actual application environment, such as low-pressure irrigation or high-pressure industrial pipelines. For example, in mild environments, one set of bamboo winding layers can reduce costs; in highly corrosive or high-pressure areas, increasing the number of layers can improve overall protection by stacking radial and axial layers.

[0050] like Figure 1 As shown, the bamboo wrapping layer includes a radial bamboo wrapping layer 2 and an axial bamboo wrapping layer 5 from the inside out. The radial bamboo wrapping layer 2 includes several sets of radial bamboo fiber sheets wound around the pipe body 1. The radial bamboo fiber sheets include a semi-circular first radial sheet and a second radial sheet. Both ends of the first radial sheet and the second radial sheet are provided with a first spiral layer 3. The structure of the first radial sheet is as follows: Figure 2 As shown, during the preparation process, bamboo strips are bent into a semi-circle, and then the ends of the first and second radial sheets are rotated into a spiral shape to obtain the first spiral layer. In the radial bamboo fiber sheets, the first spiral layer 3 on the first radial sheet and the first spiral layer 3 on the second radial sheet are in contact with each other, as shown... Figure 3 As shown, several second spiral layers 4 are provided on the first and second radial plates; the first and second radial plates are wound around the pipe body 1, as shown. Figure 4 As shown.

[0051] In some embodiments, the axial bamboo wrapping layer 5 includes several bamboo strips arranged along the axis of the pipe body 1, with the bamboo strips sequentially contacting each other to form a circle, such as... Figure 5 As shown;

[0052] The first spiral layer 3 and the second spiral layer 4 are located between the radial bamboo wrapping layer 2 and the axial bamboo wrapping layer 5, and both the first spiral layer 3 and the second spiral layer 4 are internally or externally tangent to the radial bamboo wrapping layer 2 and the axial bamboo wrapping layer 5.

[0053] In some embodiments, the outer diameters of the first spiral layer 3 and the second spiral layer 4 are the same, and the outer diameters of the first spiral layer 3 and the second spiral layer 4 are less than or equal to 5-7 mm.

[0054] The width of the first and second radial strips is 8-12cm, and the thickness of the first and second radial strips is 2.5-3.5mm. The width of the bamboo strips is 6-8cm, and the thickness of the bamboo strips is 1.5-2mm.

[0055] The first radial sheet, with a width of 10cm and a thickness of 3mm, was subjected to a three-point bending test according to ASTM D790. The bending strength of the first radial sheet was 208MPa and the elastic modulus was ≥15GPa, which met the requirements for resisting prestress during the winding process and prevented the bamboo strip from breaking or wrinkling.

[0056] The axial bamboo wrapping layers 5 are connected sequentially to form a circle. The width of the bamboo strips of the axial bamboo wrapping layer 5 is 8cm and the thickness is 3mm. According to the compression test GB / T 1448-2005, the circumferential compressive strength of the circular axial bamboo wrapping layer 5 is 86MPa, which is 15% higher than that of the bamboo strip with a width of 6cm. However, a width of more than 8cm will lead to an increase in the gap between the bamboo strips and a decrease in stiffness.

[0057] Example 2

[0058] Based on the above embodiments, the bamboo wrapping layer further includes a tung oil curing layer 6, which is located between the radial bamboo wrapping layer 2 and the pipe body 1. The bamboo wrapping layer also includes a polyurea layer, with the tung oil curing layer 6 located between the radial bamboo wrapping layer 2 and the pipe body 1, and the polyurea layer located on the axial bamboo wrapping layer 5.

[0059] The tung oil curing layer is located between the pipe body 1 and the radial bamboo wrapping layer 2, and mainly serves to bond, prevent corrosion and enhance the interface bonding.

[0060] The tung oil curing layer comprises the following components in parts by weight: 80-95 parts tung oil, 5-15 parts rosin, and 3-8 parts curing agent.

[0061] During use, clean the surface of the pipe body 1 by wiping it with alcohol to remove oil and impurities. Then, during the process of winding the radial bamboo wrapping layer 2, spray the tung oil curing layer between the radial bamboo wrapping layer 2 and the cleaned pipe body 1, ensuring that the tung oil curing layer is evenly distributed between the radial bamboo wrapping layer 2 and the cleaned pipe body 1. The thickness of the tung oil curing layer is 0.1-0.3 mm.

[0062] After wrapping the radial bamboo layer 2 and spraying the tung oil curing layer, let it stand at room temperature for 30-60 minutes to allow the tung oil curing layer to penetrate the bamboo fiber.

[0063] The polyurea layer is located outside the axial bamboo-wrapped layer 5, serving as the outermost protective layer and providing abrasion resistance, impact resistance, and weather resistance.

[0064] The polyurea layer comprises the following components in parts by weight: 40-50 parts of isocyanate component A and 50-60 parts of amine resin component B.

[0065] The polyurea layer is applied using a spray coating process. First, the surface of the axial bamboo-wrapped layer is cleaned to remove dust and oil.

[0066] Using a high-pressure spray gun, the polyurea layer is evenly sprayed onto the surface of the axial bamboo wrapping layer, focusing on covering the joint areas of the bamboo strips to avoid missed areas.

[0067] After spraying, the material is cured at room temperature to obtain a polymer composite pipe.

[0068] Example 3

[0069] Based on the above embodiment, a filling layer is provided between the radial bamboo wrapping layer 2 and the axial bamboo wrapping layer 5. The filling layer includes a plurality of bamboo chips or wood chips. Both the bamboo chips and wood chips are spherical, and the particle size of the bamboo chips and wood chips is less than or equal to 0.5 mm.

[0070] Along the axial direction of the pipe body 1, the straight lines containing the centers of the first and second radial sheets of two adjacent radial bamboo fiber sheets are perpendicular to each other, such as... Figure 6 As shown.

[0071] In some embodiments, a bamboo-wound polymer composite pipe is prepared using a pipe preparation device, such as... Figure 7 As shown, the pipe preparation device includes a fixed ring 7, on which a rotating ring 8 with the same center is provided. The fixed ring 7 is provided with a circular groove, and the rotating ring 8 is provided with a slider located in the circular groove. The rotating ring 8 can rotate circumferentially along the circular groove on the fixed ring 7.

[0072] An adjusting rod 9 is provided on the rotating ring 9, and the straight line of the adjusting rod 9 is parallel to the axis of the rotating ring 8; several bamboo strips are provided on the adjusting rod 9;

[0073] Step 1: When using the pipe body 1, place it at the center of the fixing ring 7 and fix it. The fixing can be done by clamping the fixing ring and the pipe body, or by clamping the pipe body with other fixing support components.

[0074] Step 2: The rotating ring 8 rotates circumferentially on the fixed ring 7. During the rotation, the bamboo strip on the adjusting rod 9 is wrapped around the pipe body. After being wrapped around the pipe body 1, the adjusting rod 9 is connected to the two ends of the bamboo strip wrapped around the pipe body 1. The adjusting rod 9 rotates circumferentially to obtain two first spiral layers 3.

[0075] Step 3: Several first nozzles are provided on the inner ring of the fixed ring 7. The first nozzles are used to spray the tung oil curing layer between the radial bamboo fiber sheet and the pipe body 1.

[0076] Step 4: Repeat steps 2 and 3 to obtain several radial bamboo fiber sheets, and the straight lines at the center of the first and second radial sheets in two adjacent radial bamboo fiber sheets are perpendicular to each other.

[0077] Step 5: Place several second spiral layers 4 on the outside of several radial bamboo fiber sheets, so that the second spiral layers 4 on the radial bamboo fiber sheets come into contact with each other in sequence and are tangent to the radial bamboo fiber sheets.

[0078] Step 6: Lay several spherical bamboo or wood chips on the second spiral layer 4 to form a ring-shaped filling layer between the bamboo or wood chips and the second spiral layer 4.

[0079] Step 7: Place several bamboo strips sequentially on the filling layer along the axis of the pipe body 1 and form a ring.

[0080] Step 8, during the process of laying several bamboo strips in sequence along the axis of the pipe body 1, the first nozzle is used to spray the tung oil curing layer between the filling layer and the bamboo strips in step 7.

[0081] Step 9: After several bamboo strips are laid out sequentially along the axis of the pipe body 1, several second nozzles are installed on the inner ring of the fixing ring 7. The second nozzles are used to spray the polyurea layer onto the bamboo strips to obtain a polymer composite pipe.

[0082] The terms "first," "second," and "third" used in this document are merely for clarity of description and are not intended to restrict any order or emphasize importance. Furthermore, the term "connection" used in this document, unless otherwise specified, can refer to a direct connection or an indirect connection via other components.

[0083] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A bamboo-wound polymer composite pipe, characterized by, The pipeline body (1) is provided with at least one set of bamboo winding layer outside, which comprises radial bamboo winding layer (2) and axial bamboo winding layer (5) from inside to outside, the radial bamboo winding layer (2) comprises several groups of radial bamboo fiber sheets wound on the pipeline body (1), the radial bamboo fiber sheet comprises a semicircular first radial sheet and a second radial sheet, and the first radial sheet and the second radial sheet form a circle; The axial bamboo winding layer (5) comprises several bamboo sheets arranged along the direction of the axis of the pipeline body (1), and the several bamboo sheets are in contact with each other to form a circle.

2. A bamboo-wound polymer composite pipe according to claim 1, wherein Both ends of the first radial sheet and the second radial sheet are provided with a first spiral layer (3), and in the radial bamboo fiber sheet, the first spiral layer (3) on the first radial sheet is in contact with the first spiral layer (3) on the second radial sheet.

3. A bamboo-wound polymer composite pipe according to claim 2, wherein A plurality of second spiral layers (4) are arranged on the first radial sheet and the second radial sheet, the second spiral layer (4) is located between the radial bamboo winding layer (2) and the axial bamboo winding layer (5), and the second spiral layer (4) is inscribed or circumscribed in the radial bamboo winding layer (2) and the axial bamboo winding layer (5).

4. A bamboo-wound polymer composite pipe according to claim 1, wherein The bamboo winding layer further comprises a tung oil curing layer (6), and the tung oil curing layer (6) is located between the radial bamboo winding layer (2) and the pipeline body (1).

5. A bamboo-wound polymer composite pipe according to claim 1, wherein A filling layer is arranged between the radial bamboo winding layer (2) and the axial bamboo winding layer (5), the filling layer comprises a plurality of bamboo chips or wood chips, the bamboo chips and the wood chips are spherical, and the particle size of the bamboo chips and the wood chips is less than or equal to 0.5mm.

6. A bamboo-wound polymer composite pipe according to claim 1, wherein The bamboo winding layer further comprises a polyurea layer, and the polyurea layer is located on the axial bamboo winding layer (5).

7. A bamboo-wound polymer composite pipe according to claim 1, wherein Along the axis direction of the pipeline body (1), the straight lines at the centers of the first radial sheet and the second radial sheet in the two adjacent radial bamboo fiber sheets are perpendicular to each other.

8. A bamboo-wound polymer composite pipe according to claim 1, wherein The width of the first radial sheet and the second radial sheet is 8-12cm, and the thickness of the first radial sheet and the second radial sheet is 2.5-3.5mm.

9. A bamboo-wound polymer composite pipe according to claim 1, wherein The width of the bamboo sheet is 6-8cm, and the thickness of the bamboo sheet is 1.5-2mm.

10. A bamboo-wound polymer composite pipe according to claim 3, wherein The outer diameters of the first spiral layer (3) and the second spiral layer (4) are the same, and the outer diameters of the first spiral layer (3) and the second spiral layer (4) are less than or equal to 5-7mm.

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