Carbon fiber alloy top tube

Abstract

The utility model discloses carbon fiber alloy top pipe belongs to pipeline engineering field, including pipe body, the pipe body is composite layered structure, from inside to outside includes inner lining layer, structural reinforcing layer and plastic layer in proper order, the inner lining layer is made of carbon fiber composite material, structural reinforcing layer is tightly covered in the outer surface of inner lining layer, is commonly constituted by metal net frame and the fiber reinforced composite material of cladding metal net frame, the utility model discloses adopt " inner anticorrosion, middle strong core, outer protection " function gradient design concept, and each layer material is in close combination to each play its own role, has realized the optimization of overall performance, and the plastic layer is as the innermost layer, makes the pipeline inner wall can resist the corrosion of various acid alkali salt etc. corrosive medium, through the plastic layer and the protection outer layer that set up, the effective protection pipe body is exempted from the scratch, the abrasion and the impact of sharp object such as gravel, grit in the jacking process, has guaranteed the long -term safety of pipe body, light weight, convenient construction.

Description

Technical Field

[0001] This utility model relates to the field of pipeline engineering technology, and in particular to carbon fiber alloy jacking pipe. Background Technology

[0002] In underground pipeline engineering, pipe jacking is an important pipeline structure widely used in projects such as agricultural irrigation pipeline laying, gas transmission, and urban underground drainage systems.

[0003] Currently, most jacking pipes on the market are made of a single material, such as pure plastic jacking pipes, pure metal jacking pipes, or pure carbon fiber jacking pipes. Although pure plastic jacking pipes are cheaper, they lack strength and rigidity. In large-diameter applications, they are prone to deformation or damage due to excessive external pressure. Pure metal jacking pipes have high strength, but they are heavy, making transportation and installation inconvenient, and they are prone to corrosion after long-term use. Pure carbon fiber jacking pipes have good strength and lightweight properties, but their cost is too high, making it difficult to promote and apply them on a large scale. Therefore, we propose carbon fiber alloy jacking pipes to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to propose a carbon fiber alloy jacking pipe to solve the problems of insufficient strength, heavy weight, poor corrosion resistance and high cost of existing jacking pipes.

[0005] To achieve the above objectives, this utility model employs the following technology: a carbon fiber alloy jacking pipe, comprising a pipe body, wherein the pipe body has a composite layered structure, comprising an inner lining layer, a structural reinforcement layer, and a plastic layer from the inside out. The inner lining layer is made of carbon fiber composite material, and the structural reinforcement layer is tightly wrapped around the outer surface of the inner lining layer, consisting of a metal mesh frame and fiber-reinforced composite material covering the metal mesh frame. The plastic layer is wrapped around the outer surface of the structural reinforcement layer.

[0006] As a further description of the above technical solution: a transitional adhesive layer for strengthening interlayer bonding is provided between the inner lining layer and the structural reinforcement layer, and the transitional adhesive layer is a modified polyurethane adhesive containing 10-15% short-cut carbon fibers.

[0007] As a further description of the above technical solution: the outer surface of the plastic layer is coated with a protective outer layer.

[0008] As a further description of the above technical solution: the carbon fiber composite material in the inner lining layer is made of carbon fiber woven fabric and epoxy resin composite.

[0009] As a further description of the above technical solution: the metal mesh in the structural reinforcement layer is a perforated metal plate, and the reinforcing fiber in the fiber-reinforced composite material is a mixture of aramid fiber and carbon fiber.

[0010] As a further description of the above technical solution: the plastic layer is made of ultra-high molecular weight polyethylene.

[0011] As a further description of the above technical solution: the protective outer layer is a fluorocarbon resin coating containing 8-12% glass flakes.

[0012] As a further description of the above technical solution: the outer wall of the insertion port of the tube body is provided with external threads, and the outer surface of the tube body is provided with uniformly distributed annular embossing, the depth of which is 0.5-1.5mm.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: This utility model adopts a functional gradient design concept of "internal anti-corrosion, medium-strength core, and external protection." Each layer of material performs its specific function while being closely integrated, achieving optimal overall performance. The innermost plastic layer enables the inner wall of the pipe to withstand the erosion of various corrosive media such as acids, alkalis, and salts, resulting in a service life far exceeding that of metal pipes. Furthermore, the smooth inner wall reduces fluid resistance. The structural reinforcement layer employs a hybrid reinforcement mode of "alloy skeleton + fiber composite material." The alloy skeleton provides excellent impact and crush resistance, working synergistically with the high-modulus carbon fiber inner lining and the external fiber composite material to withstand enormous jacking forces and soil pressures. This design is particularly suitable for deep pipe jacking projects. The plastic layer and protective outer layer effectively protect the pipe body from scratches, wear, and impacts from sharp objects such as gravel and sand during jacking, ensuring long-term pipe safety. The design is lightweight, easy to construct, and while maintaining ultra-high strength, the overall structure is significantly lighter than steel pipes and reinforced concrete pipes, facilitating installation and enabling longer jacking distances, thus improving construction efficiency. Attached Figure Description

[0014] Figure 1 A schematic diagram of the overall structure according to an embodiment of the present utility model is shown; Figure 2 A side view structural schematic diagram according to an embodiment of the present utility model is shown; Figure 3 A side view cross-sectional structural schematic diagram according to an embodiment of the present invention is shown.

[0015] Legend: 1. Pipe body; 101. Inner lining layer; 102. Structural reinforcement layer; 103. Plastic layer; 104. Protective outer layer; 2. External thread; 3. Annular embossing; 4. Transition bonding layer. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] Reference Figures 1-3 The carbon fiber alloy jacking pipe provided in this embodiment includes a pipe body 1. The pipe body 1 has a composite layered structure, which includes an inner lining layer 101, a structural reinforcement layer 102 and a plastic layer 103 from the inside to the outside. The inner lining layer 101 is made of carbon fiber composite material. The structural reinforcement layer 102 is tightly wrapped around the outer surface of the inner lining layer 101 and is composed of a metal mesh frame and a fiber-reinforced composite material covering the metal mesh frame. The plastic layer 103 is wrapped around the outer surface of the structural reinforcement layer 102.

[0018] Specifically, during use, the metal mesh frame of the structural reinforcement layer 102 acts as a rigid skeleton, efficiently transmitting and distributing axial force throughout the pipe wall. The inner lining layer 101 provides extremely high compressive strength and modulus, preventing the pipe from being crushed or unstable under immense jacking force. The structural reinforcement layer 102 provides toughness and impact resistance, while the inner lining layer 101 provides high strength. The combination of these two achieves ultra-high axial compressive strength under extreme lightweight conditions. The plastic layer 103, made of ultra-high molecular weight polyethylene (UHMWPE), is a recognized material with extremely high wear resistance. During jacking, it acts like a layer of "lubricating armor," directly rubbing against the soil and gravel, protecting the expensive internal load-bearing structure from damage through its own wear. The inner lining layer 101 acts as a "liner" against internal corrosion. The structural reinforcement layer 102 serves as the backbone for load-bearing, and the plastic layer 103 resists wear. Each material layer performs its specific function, working collaboratively to achieve the goals of safe, efficient, and long-lasting pipe jacking engineering.

[0019] Furthermore, a transitional bonding layer 4 for strengthening interlayer bonding is provided between the inner lining layer 101 and the structural reinforcement layer 102. The transitional bonding layer 4 is a modified polyurethane adhesive containing 10-15% short-cut carbon fibers. The carbon fiber composite material in the inner lining layer 101 is made of carbon fiber woven fabric and epoxy resin.

[0020] Specifically, the transition bonding layer 4 enhances the bonding strength between the inner lining layer 101 and the structural reinforcement layer 102, effectively preventing interlayer separation. The carbon fiber woven fabric itself possesses extremely high tensile strength and elastic modulus, far exceeding the strength of traditional metal materials. Epoxy resin, as a high-quality matrix, tightly wraps and fixes the fiber bundles of the carbon fiber woven fabric, forming a uniform stress system. During underground construction, the pipe jacking system must withstand soil lateral pressure, axial thrust from the jacking operation, and internal pressure during media transport. This composite structure effectively disperses these external forces, preventing structural damage caused by localized stress concentration. Compared to the metal material of pure metal pipe jacking systems… Carbon fiber woven fabric has an extremely low density, and epoxy resin also has a density far lower than that of metal. The carbon fiber layer made by combining the two is lightweight, and the carbon fiber woven fabric itself is chemically stable and does not react with corrosive substances such as acids, alkalis, and salts. Epoxy resin also has excellent chemical corrosion resistance and can form a dense protective layer that isolates external corrosive media from contact with the carbon fiber. After the two are combined, the carbon fiber layer can maintain stable performance in harsh underground environments for a long time without corrosion or aging. Combined with the secondary protection of the outer plastic layer, the overall service life of the pipe jacking is improved, the frequency of later pipeline maintenance and replacement is greatly reduced, and the operation and maintenance costs of urban underground pipeline projects are lowered.

[0021] Furthermore, the metal mesh in the structural reinforcement layer 102 is a perforated metal plate, and the reinforcing fiber in the fiber-reinforced composite material is a mixture of aramid fiber and carbon fiber.

[0022] Specifically, during the manufacturing process, the holes in the perforated metal plate are "filled" by resin and fiber, forming a large number of mechanically interlocking structures. This is like setting countless "rivets" between the metal and the composite material, which greatly enhances the interlayer bonding force and effectively prevents delamination under huge top forces or impacts. Moreover, the perforated metal plate itself has high in-plane stiffness and strength, and uniform stress distribution, which can effectively resist local compression and deformation of the soil and prevent the pipe from being "crushed" when buried deep or subjected to external impacts. Aramid fiber is known for its high toughness, high impact resistance and high elongation at break. Its addition can greatly improve the brittleness of the composite material, making the pipe less likely to break when subjected to huge impacts, but instead absorb energy and produce plastic deformation. By combining aramid fiber and carbon fiber, a "rigid and flexible" ultra-high performance material with both extremely high stiffness (carbon fiber) and extremely high toughness (aramid fiber) is created. This combination can withstand extreme loads and impacts.

[0023] Furthermore, the plastic layer 103 is made of ultra-high molecular weight polyethylene.

[0024] Specifically, high-strength polyethylene (HDPE) possesses excellent mechanical properties, with high tensile strength, compressive strength, and impact toughness. For large-diameter jacking pipes, during underground construction and long-term use, they must withstand soil pressure, groundwater pressure, and internal pressure during media transport. This material effectively resists these external forces, preventing cracking and deformation of the plastic layer 103. It thus provides reliable protection for the inner structural reinforcement layer 102 and the inner lining layer 101, preventing damage from external exposure and ensuring the overall structural stability of the jacking pipe. This reduces safety hazards such as pipe leakage and collapse. Furthermore, its good toughness allows it to buffer stress through deformation when encountering minor geological subsidence or vibration, reducing the risk of jacking pipe breakage due to excessive rigidity. Additionally, HDPE material has superior... High-strength polyethylene (HDPE) exhibits exceptional chemical stability, exhibiting excellent resistance to various corrosive substances such as acids, alkalis, and salts, and is not prone to chemical reactions. This allows the jacking pipe to maintain stable performance in harsh underground environments for extended periods, eliminating the need for frequent anti-corrosion maintenance, significantly reducing later operation and maintenance costs, and extending the service life of the jacking pipe. Furthermore, HDPE has a lower density than metal materials, effectively controlling the overall weight of the jacking pipe. For large-diameter jacking pipes, lightweighting reduces transportation difficulties, energy consumption, and costs during transportation, while also facilitating splicing operations, reducing construction difficulty and manpower. In addition, compared to pure carbon fiber jacking pipes, HDPE is more cost-effective. Using it as an outer layer material can significantly reduce overall production costs while ensuring the performance of the jacking pipe. Moreover, HDPE is recyclable, meeting environmental protection production requirements.

[0025] Furthermore, the outer surface of the plastic layer 103 is coated with a protective outer layer 104, which is a fluorocarbon resin coating containing 8-12% glass flakes.

[0026] Specifically, fluorocarbon resin itself has extremely low permeability, with a water permeability of ≤0.01g / (m²・d). Combined with overlapping scales to form a multi-layer barrier structure, it can extend the permeation path of corrosive media in the soil by 3-5 times, effectively preventing water and ions from contacting the outer layer of the alloy. Its fluorocarbon resin coating has high surface hardness, is resistant to friction and wear, and has a certain degree of elasticity. When it encounters the impact of gravel with a diameter of ≤30mm, it can absorb 30-40% of the impact energy through its own deformation, reducing the stress transmission of the impact to the plastic layer 103, forming a dense protective film to resist the erosion of microorganisms and chemical media in the soil.

[0027] Furthermore, the outer wall of the insertion port of the tube body 1 is provided with an external thread 2, and the outer surface of the tube body 1 is provided with uniformly distributed annular embossing 3, the depth of which is 0.5-1.5mm.

[0028] Specifically, the external thread 2 facilitates the assembly and disassembly of the pipe body 1. The shallow annular grooves 3 on the outer surface of the pipe body 1 increase the friction between the outer surface of the pipe body 1 and the soil, reducing the resistance during underground jacking construction. They also prevent hand slippage during handling and facilitate plug-in installation and use.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A carbon fiber alloy jacking pipe, characterized in that, The tube (1) is a composite layered structure, consisting of an inner lining (101), a structural reinforcement layer (102), and a plastic layer (103) from the inside out. The inner lining (101) is made of carbon fiber composite material. The structural reinforcement layer (102) is tightly wrapped around the outer surface of the inner lining (101) and is composed of a metal mesh frame and a fiber-reinforced composite material covering the metal mesh frame. The plastic layer (103) is wrapped around the outer surface of the structural reinforcement layer (102).

2. The carbon fiber alloy jacking pipe according to claim 1, characterized in that, A transitional adhesive layer (4) for strengthening interlayer bonding is provided between the inner lining layer (101) and the structural reinforcement layer (102).

3. The carbon fiber alloy jacking pipe according to claim 1, characterized in that, The outer surface of the plastic layer (103) is coated with a protective outer layer (104).

4. The carbon fiber alloy jacking pipe according to claim 1, characterized in that, The carbon fiber composite material in the inner lining (101) is made of carbon fiber woven fabric and epoxy resin.

5. The carbon fiber alloy jacking pipe according to claim 1, characterized in that, The metal mesh frame in the structural reinforcement layer (102) is a perforated metal plate.

6. The carbon fiber alloy jacking pipe according to claim 1, characterized in that, The plastic layer (103) is made of ultra-high molecular weight polyethylene.

7. The carbon fiber alloy jacking pipe according to claim 1, characterized in that, The outer wall of the insertion port of the tube body (1) is provided with an external thread (2), and the outer surface of the tube body (1) is provided with uniformly distributed annular embossing (3), the depth of which is 0.5-1.5mm.

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