Bamboo winding composite pipe with high ring stiffness

Abstract

The utility model discloses a bamboo winding composite pipe with high ring stiffness, which belongs to the field of bamboo winding composite pipes, sequentially comprises an inner lining layer, an integrated structure layer and an outer protective layer from inside to outside along the pipe diameter direction, and is characterized in that the inner lining layer is bamboo fiber non-woven fabrics and glass fiber knitted felts which are soaked with resin, and the outer protective layer is made of bamboo fiber non-woven fabrics and glass fiber knitted felts. The integrated structure layer is formed by compounding two bamboo winding layers and a steel pipe layer layer by layer, the outer protection layer is a polyethylene resin layer, and the utility model further discloses a preparation method of the high-ring-stiffness bamboo winding composite pipe. According to the bamboo winding composite pipe, the bamboo winding composite layer and the steel pipe layer form an integrated structure layer which works cooperatively, the integrated structure layer can provide larger ring stiffness of the bamboo winding composite pipe, ovalization deformation of the bamboo winding composite pipe is prevented, and the internal pressure bearing capacity of the bamboo winding composite pipe can be improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to bamboo winding composite pipe technical field, concretely relates to a high ring stiffness bamboo winding composite pipe. BACKGROUND

[0002] With the increasing importance of global environmental protection, reducing dependence on traditional non-renewable resources has become an important issue. Bamboo winding composite pipe takes bamboo as the main raw material, and bamboo is a renewable green environmental protection material. It grows fast and can be used in a short time, which can effectively reduce the consumption of non-renewable resources such as petroleum and coal, and meets the concept of sustainable development. As a new type of environmental protection pipe material, bamboo winding composite pipe has gradually attracted attention in recent years. It takes bamboo as the main reinforcing material and is composed of winding process and matrix material such as resin. Compared with traditional metal or plastic pipe material, it has the advantages of low cost, light weight, corrosion resistance and so on, and shows certain application potential in municipal water supply and drainage, farmland irrigation and other fields.

[0003] With the continuous advancement of infrastructure construction and the increasingly stringent environmental protection requirements, the demand for high-performance pipes in the pipe market has increased dramatically. Bamboo winding composite pipe is highly expected to replace some traditional pipe materials on a large scale and expand its application to more extensive scenarios such as urban underground comprehensive pipe gallery and industrial low-pressure fluid transportation. However, these application scenarios often have high requirements for the mechanical properties of the pipe, especially the ring stiffness. Ring stiffness is a key indicator of the pipe's ability to resist external ring pressure, and it is directly related to the stability and carrying capacity of the pipe after burial. If the ring stiffness is insufficient, the pipe is prone to deformation, rupture, and other serious accidents such as leakage, which cannot meet the demand of complex working conditions and limits the further popularization and application of bamboo winding composite pipe. Compared with traditional metal pipes, bamboo winding composite pipes are less likely to incorporate such ingenious ideas in the initial design, and the overall structure is single, which cannot fully utilize the advantages of various material combinations to cope with complex external impact and sustained pressure, so the ring stiffness cannot meet the standard.

[0004] Therefore, bamboo winding composite pipe is restricted by factors such as material, process and structure design, and the problem of insufficient ring stiffness is prominent, which needs to be solved through innovative technical means to unlock broader application space. Therefore, it is important to design a bamboo winding composite pipe with high ring stiffness that can cope with complex environmental conditions, so that the bamboo winding composite pipe can better meet the requirements of ring stiffness in actual engineering. UTILITY MODEL CONTENTS

[0005] In view of the defects of the prior art and the demand for improvement, the utility model discloses a kind of high ring stiffness bamboo winding composite pipe, its own characteristics and its preparation process characteristics are combined bamboo winding composite pipe, by the research and the design of the integrated structure layer of bamboo winding composite pipe, prepared a kind of high ring stiffness, high strength bamboo winding composite pipe.

[0006] The utility model discloses a kind of high ring stiffness bamboo winding composite pipe, the high ring stiffness bamboo winding composite pipe includes inner lining layer, integrated structure layer and outer protective layer in turn from inside to outside along pipe diameter direction, characterized by:the inner lining layer is bamboo fiber nonwoven fabric and glass fiber knitted felt soaked with resin, the integrated structure layer includes inner bamboo winding composite layer, steel pipe layer and outer bamboo winding composite layer.

[0007] Further, the inner bamboo winding composite layer and outer bamboo winding composite layer all include multiple bamboo splint layers, are wound by multiple bamboo splint layers, the steel pipe layer is Q345 steel material, the inner bamboo winding composite layer, steel pipe layer and outer bamboo winding composite layer are connected by resin between and are successively compounded into shape.

[0008] Further, the outer protective layer is polyethylene resin layer with high strength, water resistance and good pressure resistance.

[0009] Further, the resin is one of epoxy resin, polyethylene resin and polypropylene resin.

[0010] The utility model discloses a kind of high ring stiffness bamboo winding composite pipe, compared with prior art, with the following beneficial effects:

[0011] 1) the bamboo fiber nonwoven fabric and glass fiber knitted felt soaked with resin in the utility model are used as inner lining layer with higher strength and rigidity, corrosion resistance and excellent sealing performance.Bamboo fiber nonwoven fabric has certain strength and tenacity, after reasonable processing technology treatment, its strength can satisfy the demand of different purposes, not easy to break, tear, with good durability.Glass fiber knitted felt has good resin permeability, when making inner lining layer, resin can quickly, uniformly penetrate into felt piece, fill the gap between fiber, form a whole composite material structure.This not only strengthens the bonding force between inner lining layer and pipeline main body, also improves the density and integrity of inner lining layer, further improves its corrosion resistance, wear resistance and other performances.The inner lining layer can be used as a barrier, to isolate corrosive medium and pipeline main body material, avoid pipeline direct contact corrosive substance, thereby prolong the service life of pipeline;

[0012] 2) The utility model discloses an integrated structure layer is arranged inside steel pipe layer, compared with the bamboo winding composite pipe technology of pure relying on bamboo winding structure or only using conventional reinforcing means, the anti -deformation ability of compression of pipe whole can be obviously enhanced by adding steel pipe layer, thereby improve the ring stiffness of bamboo winding composite pipe,

[0013] 3) The outer protective layer selects polyethylene resin layer, compared with some traditional outer protective layer material, polyethylene resin layer shows very strong chemical corrosion resistance, this makes bamboo winding composite pipe under different environmental conditions, especially in some corrosive medium environment, can effectively prevent the erosion of external material to the internal structure of bamboo winding composite pipe, prolongs the service life of composite pipe. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is high ring stiffness bamboo winding composite pipe structure schematic diagram of the utility model,

[0015] Figure 2 It is high ring stiffness bamboo winding composite pipe whole structure schematic diagram of the utility model,

[0016] The following is shown in the drawings:

[0017] 1, inner lining layer;2, integrated structure layer;201, inner bamboo winding composite layer;202, steel pipe layer;203, outer bamboo winding composite layer;3, outer protective layer. DETAILED DESCRIPTION

[0018] The following will be further described with the drawings to the technical scheme of high ring stiffness bamboo winding composite pipe of the utility model, so that the person skilled in the art can better understand the utility model and can be implemented.

[0019] It should be noted that, in the utility model, the orientation or position relationship indicated by the terms "upper", "lower", "inner" and the like is based on the orientation or position relationship shown in the drawings. These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0020] And, in addition to being used to indicate the orientation or position relationship, the above-mentioned part of the term can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For ordinary skilled in the art, the specific meaning of these terms in the utility model can be understood according to the specific situation.

[0021] In addition, the terms "set", "provided with", "connected", "fixed" and the like should be interpreted broadly. For example, "connected" can be fixed connection, detachable connection, or integral configuration; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection via an intermediate medium, or internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood according to the specific circumstances by those skilled in the art.

[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, and the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0023] As shown in Figure 1 and Figure 2 A high-ring-rigidity bamboo winding composite pipe, which comprises, from inside to outside along the pipe diameter direction, an inner lining layer 1, an integrated structure layer 2 and an outer protective layer 3. The inner lining layer 1 is bamboo fiber non-woven fabric and glass fiber knitted felt impregnated with resin. The integrated structure layer 2 comprises an inner bamboo winding composite layer 201, a steel pipe layer 202 and an outer bamboo winding composite layer 203.

[0024] The bamboo fiber non-woven fabric and glass fiber knitted felt impregnated with resin as the inner lining layer 1 has high strength and rigidity, corrosion resistance and excellent sealing performance. Bamboo fiber non-woven fabric is an inorganic non-metallic material with excellent performance, which has certain strength and toughness. After reasonable processing, its strength can meet the needs of different purposes, and it is not easy to break or tear, and has good durability. The glass fiber knitted felt has good resin permeability. When the inner lining layer 1 is made, the resin can quickly and uniformly penetrate into the felt sheet, filling the gaps between the fibers to form a whole composite material structure. This not only enhances the bonding force between the inner lining layer 1 and the pipe body, but also improves the density and integrity of the inner lining layer 1, further improving its corrosion resistance, wear resistance and other properties.

[0025] The integrated structure layer 2 is formed by connecting and layer-by-layer compounding the inner bamboo winding composite layer 201, the steel pipe layer 202 and the outer bamboo winding composite layer 203 through resin. The inner bamboo winding composite layer 201 and the outer bamboo winding composite layer 203 each comprise a plurality of bamboo splint layers, which are wound by a plurality of bamboo splint layers. The steel pipe layer 202 is made of Q345 steel material. The bamboo winding composite layer and the steel pipe layer 202 can compensate for each other's defects through reasonable composite structure design. The bamboo winding composite layer can protect the steel pipe layer 202 from external environment, and the steel pipe layer 202 provides a stable support structure for the bamboo winding composite layer, effectively improving the overall pressure-bearing capacity of the pipe, which can withstand higher pressure grades than single-material pipes.

[0026] The outer protective layer 3 is a polyethylene resin layer with high strength, water resistance and good pressure resistance.

[0027] The resin is one of an epoxy resin, a polyethylene resin and a polypropylene resin, and has excellent corrosion resistance and adhesion.

[0028] The preparation method of the high-ring-rigidity bamboo winding composite pipe comprises the following steps:

[0029] The inner lining layer 1 is made by winding and gluing the bamboo fiber non-woven fabric and glass fiber knitted felt soaked with resin to ensure that the non-woven fabric is flat and wrinkle-free.

[0030] The inner bamboo winding composite layer 201 is made by uniformly spraying adhesive resin on the inner wall of the steel pipe layer 202, and then winding the bamboo splints with a length of 2 m, a width of 5 mm and a thickness of 1 mm in a specific winding mode (the winding angle is set to 45-75 degrees after simulation optimization) and constant tension on the inner wall of the steel pipe layer 202 through a winding device.

[0031] The outer bamboo winding composite layer 203 is built by brushing adhesive resin on the outer wall of the steel pipe layer 202, and then winding the bamboo splints from the starting end at a set tension and angle, and adjusting in real time to ensure that the fibers are closely arranged.

[0032] The outer protective layer 3 is made of polyethylene resin material, and is tightly wrapped around the outer bamboo winding composite layer 203 by extrusion coating process.

[0033] The above detailed implementation process can produce a high-ring-rigidity bamboo winding composite pipe with excellent performance and adaptability to multiple working conditions.

[0034] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the technical field can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A high hoop stiffness bamboo-wound composite pipe, the bamboo-wound composite pipe structure sequentially comprises an inner liner layer (1), an integrated structure layer (2) and an outer protective layer (3) from inside to outside along the pipe diameter direction, characterized in that: The inner lining layer (1) is a resin-impregnated bamboo fiber non-woven fabric and a glass fiber needle felt, the integrated structure layer (2) comprises an inner bamboo winding composite layer (201), a steel pipe layer (202) and an outer bamboo winding composite layer (203).

2. The high hoop stiffness bamboo filament wound composite pipe according to claim 1, characterized in that: The inner bamboo winding composite layer (201) and the outer bamboo winding composite layer (203) each comprise a plurality of bamboo splint layers which are wound by a plurality of bamboo splint layers, the steel pipe layer (202) is Q345 steel material, and the inner bamboo winding composite layer (201), the steel pipe layer (202) and the outer bamboo winding composite layer (203) are connected by resin and are sequentially wound and compounded.

3. The high hoop stiffness bamboo filament wound composite pipe according to claim 1, characterized in that: The outer protective layer (3) is a polyethylene resin layer.

4. The high hoop stiffness bamboo filament wound composite pipe according to claim 1, characterized in that: The resin is one of an epoxy resin, a polyethylene resin and a polypropylene resin.

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