Composite trenchless MPP electric power pipe

Abstract

The utility model belongs to the technical field of electric power pipes, and particularly relates to a composite trenchless MPP electric power pipe which comprises an inner pipe and an outer pipe which are coaxially arranged, and a composite protective layer arranged between the inner pipe and the outer pipe, the composite protective layer comprises an inner lining layer, a supporting net and an outer lining layer, a melting layer wrapping the supporting net is arranged between the inner lining layer and the outer lining layer; fusion holes are formed in the supporting net in a linear array mode, and a medium in the fusion layer penetrates through the fusion holes; a medium hanging point is integrally arranged at each fusion hole, and the medium hanging point has elastic supporting force on one side, corresponding to the outer lining layer, of the fusion layer; according to the invention, the supporting net arranged in the composite protective layer has certain elastic supporting force on the outer side part of the melting capacity layer, can adapt to rotation of the pipe body when the electric power pipe is penetrated and pulled, has certain bending performance, and is high in practicability.

Description

Technical Field

[0001] This utility model belongs to the field of power pipe technology, specifically relating to a composite trenchless MPP power pipe. Background Technology

[0002] Electrical conduits are products made of PE (modified polyethylene) or modified polypropylene (MPP) through hot-dip plastic coating or epoxy resin coating for both internal and external application. They possess excellent corrosion resistance, impact resistance, and heat resistance. Simultaneously, the coating itself has good electrical insulation properties, preventing electrolytic corrosion. Furthermore, they have low water absorption, high mechanical strength, and a low coefficient of friction, enabling long-term use.

[0003] The widespread application of power conduits, particularly in special locations such as roads, railways, buildings, and riverbeds, where MPP trenchless cable protection pipes are laid, eliminates the need for extensive excavation to damage road surfaces, minimizes traffic disruption, causes minimal damage to the geological structure, and ensures safe and reliable construction. This aligns with the green, environmentally friendly, and energy-efficient development requirements of modern construction. However, MPP trenchless cable protection pipes are relatively long, and the installation path may involve bends. Furthermore, the low tensile strength of MPP pipes makes installation difficult and prone to damage. Further improvements are necessary. Utility Model Content

[0004] The purpose of this invention is to provide a composite trenchless MPP power pipe to solve the problem in the prior art that the MPP pipe has limited tensile strength and is difficult to adapt to large bending paths when the pipe body is stretched over long distances.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A composite trenchless MPP power conduit includes an inner pipe and an outer pipe arranged coaxially, and a composite protective layer disposed between the inner pipe and the outer pipe. The composite protective layer includes an inner lining layer, a support mesh, and an outer lining layer. A fusion layer covering the support mesh is disposed between the inner lining layer and the outer lining layer. Fusion holes are linearly arrayed on the support mesh, and the medium in the fusion layer passes through the fusion holes. A medium hanging point is integrally disposed at each fusion hole, and the medium hanging point has elastic support on the side of the fusion layer corresponding to the outer lining layer.

[0007] In this application, the fusion holes on the support network are densely arranged, and multiple holes typically work together during operation. During the fusion process, it is driven by drilling equipment and operates in special locations such as roads, railways, buildings, and riverbeds. The MPP power pipe rotates and feeds, and the pressure on the outer pipe is transferred to the fusion layer. The medium within the fusion layer buffers the pressure, and the pressure can be reduced through the compression medium hanging points (which maintain their original shape and prevent pressure from being applied into the fusion holes). This improves the tensile strength of the power pipe; it is highly adaptable and practical.

[0008] Furthermore, a liner is provided between the inner tube and the support mesh to form the inner lining layer.

[0009] Furthermore, a protective pipe is provided between the support net and the outer pipe to form the outer lining layer; or, another support net is provided between the support net and the outer pipe to form the outer lining layer, with the medium hanging points of the two support nets arranged opposite to each other.

[0010] In this way, the outer lining can be formed by either a protective tube or another support mesh, which provides high flexibility in the use of materials. Furthermore, it allows for adaptive selection based on the strength requirements of the design, achieving a balance between cost and performance of the power conduit.

[0011] Furthermore, the support mesh is a spirally wound support sheet, on which fusion holes are arranged in a linear array. Each column of fusion holes is sequentially recessed by a first distance, which is less than the spacing of the linear array. The support mesh can be prefabricated, ensuring that no additional working time is added to the production process of this power pipe, thus improving efficiency.

[0012] Furthermore, the shape of the fusion hole is one of triangle, semi-circular, and square.

[0013] Furthermore, the medium hanging points on the support network are integrally formed by the support sheet during injection molding or stamping of the fusion hole; thus, the production difficulty is low, which helps to widely promote the power pipe of this application and obtain higher economic benefits.

[0014] The utility model adopting the above technical solution has the following advantages:

[0015] In this application, the power conduit includes an inner conduit and an outer conduit. Cables can be laid inside the inner conduit. When laying the power conduit underground in the target area, the medium attachment point at the fusion hole is aligned with the axial direction of the power conduit. During the power conduit's feeding process, the external pressure squeezes the outer conduit, and through the medium in the fusion layer, it squeezes the support network and its medium attachment point. The medium attachment point presses against the fusion hole, reducing the pressure. After the external pressure disappears, it recovers. In this way, the pressure is reduced through the dense medium attachment point, improving the tensile strength of the power conduit. It has strong adaptability and high practicality. Attached Figure Description

[0016] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0017] Figure 1 This is a structural schematic diagram of an embodiment of a composite trenchless MPP power pipe according to the present invention;

[0018] Figure 2 This is a partial cross-sectional schematic diagram of an embodiment of a composite trenchless MPP power pipe according to the present invention;

[0019] Figure 3 This is a radial cross-sectional schematic diagram of an embodiment of a composite trenchless MPP power pipe according to the present invention;

[0020] Figure 4 This is a schematic diagram of the assembly of the support tube in an embodiment of the present utility model;

[0021] Figure 5 This is a schematic diagram of the structure of a support tube after it has been unfolded according to an embodiment of this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of another support tube after it has been unfolded in an embodiment of this utility model;

[0023] Figure 7 This is a schematic diagram of the structure of another support tube after it has been unfolded in an embodiment of this utility model;

[0024] Figure 8 for Figure 7 Enlarged view of point I in the middle;

[0025] The symbols for the main components are explained below:

[0026] 100. Power pipe; 101. First end; 102. Inner pipe; 103. Support net; 1031. Triangular punch; 1032. Medium hanging point; 1033. Semi-circular punch; 1034. Semi-circular support point; 1035. Square punch; 1036. Square edge; 104. Protective pipe; 105. Outer pipe; 106. Fusion layer; 107. Liner. Detailed Implementation

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts are referred to by the same reference numerals in the drawings or description. Implementations not shown or described in the drawings are forms known to those skilled in the art. Furthermore, directional terms mentioned in the embodiments, such as "up," "down," "top," "bottom," "left," "right," "front," and "back," are only for reference to the directions in the drawings and are not intended to limit the scope of protection of the present invention.

[0028] like Figures 1 to 8 As shown in the figure, a composite trenchless MPP power pipe of this utility model is provided. The power pipe 100 includes an inner pipe 102 and an outer pipe 105 arranged coaxially, and a composite protective layer disposed between the inner pipe 102 and the outer pipe 105. The composite protective layer includes an inner lining layer, a support mesh 103 and an outer lining layer. A fusion layer 106 covering the support mesh 103 is disposed between the inner lining layer and the outer lining layer. The support mesh 103 has fusion holes linearly arrayed, and the medium in the fusion layer 106 passes through the fusion holes. Specifically, the fusion holes are triangular punched holes 1031 (see reference). Figure 5 Each triangular punch 1031 is integrally provided with a medium hanging point 1032, which is integrally formed by the support piece during the punching of the triangular punch 1031; the medium hanging point 1032 has elastic support on one side of the fusion layer 106 corresponding to the outer lining layer. The first end 101 of the power pipe 100 serves as a reference point, and the connection between the medium hanging point 1032 and the triangular punch 1031 is close to the first end 101. The inclined direction of the medium hanging point 1032 extends obliquely outward from the first end 101 towards the other end of the power pipe 100. The first end 101 serves as the feed end when the power pipe 100 is being pulled through.

[0029] For example, the inner tube 102 and the outer tube 105 can be made of polyethylene, polypropylene or modified polypropylene (MPP), and the inner and outer lining layers can also be made of polypropylene during extrusion molding, and the medium in the fusion layer 106 is modified polypropylene.

[0030] In this embodiment, the support mesh 103 is a support sheet spirally wound between the inner and outer lining layers. The support sheet has a linear array of fusion holes, with each row of fusion holes sequentially recessed by a first distance, which is less than the spacing of the linear array; for example, the spacing of the linear array is set to 60mm, and the first distance is 20mm. The support mesh 103 can be prefabricated, ensuring that no additional time is added to the production process of this power pipe, thus improving efficiency.

[0031] Thus, in the overall structure of the support net 103 formed by spiral winding, the fusion holes are not radially aligned, and each column has a certain indentation, but is staggered, which can ensure the overall structural strength of the power tube 100 and adapt to the pressure changes received by the power tube 100 during the rotation and pulling process.

[0032] In this embodiment, the shape of the fusion hole can be selected as either a semi-circular or square shape; correspondingly, a semi-circular punch 1033 is obtained, such as... Figure 6As shown, the medium hanging point 1032 integrally formed in the semi-circular punch 1033 is also a semi-circular support point 1034; when subjected to compression, the semi-circular support point 1034 can displace towards the semi-circular punch 1033. Figure 7 , Figure 8 As shown, when the shape of the fusion hole is square, it forms a square punch 1035. The medium hanging point 1032 integrally formed in the square punch 1035 is a square edge 1036. When the square edge 1036 is squeezed, it can be displaced towards the square punch 1035. Furthermore, the square punch 1035 and the square edge 1036 are not restricted by the direction of the power pipe 100, which makes construction more convenient.

[0033] In fact, the medium hanging point 1032 on the support net 103 can also be formed integrally by the support sheet during the injection molding fusion hole; thus, the production difficulty is low, which helps to widely promote the power pipe 100 and obtain higher economic benefits.

[0034] In this embodiment, a liner 107 is provided between the inner tube 102 and the support net 103 to form an inner liner. A protective tube 104 is provided between the support net 103 and the outer tube 105 to form an outer liner; alternatively, another support net 103 is provided between the support net 103 and the outer tube 105 to form an outer liner, with the medium hanging points 1032 of the two support nets 103 arranged opposite to each other. This forms a double-layer elastic support structure, resulting in a power pipe 100 with better tensile strength. Thus, in practical applications, either the protective tube 104 or another support net 103 can be used to form the outer liner, offering high flexibility in material selection. Furthermore, the appropriate material can be selected based on the design strength requirements, achieving a balance between cost and performance of the power pipe 100.

[0035] The working process of this embodiment is as follows: The power pipe 100 is pulled by the first end 101. During the pulling process, the soil compresses the outer pipe 105. The fusion holes on the support net 103 are densely arranged, as are the corresponding medium hanging points 1032. Usually, many of them work together. During the pulling process, the drilling equipment drives the traction, and the operation is carried out in special sections such as roads, railways, buildings, and riverbeds. The power pipe 100 rotates and feeds, and the compression of the outer pipe 105 is transmitted to the fusion layer 106. The medium in the fusion layer 106 is buffered and can reduce the pressure by compressing the medium hanging points 1032. The medium hanging points 1032 can shrink into the fusion holes to reduce the pressure. The medium hanging points 1032 have the elastic support force to maintain their original shape and avoid pressing into the fusion holes. In this way, the tensile strength of the power pipe 100 is improved, and its practicality is high.

[0036] This embodiment provides a composite trenchless MPP power conduit. During the feeding process of the power conduit 100, the external pressure squeezes the outer tube 105 and the medium in the fusion layer 106 squeezes the support network 103 and its medium hanging points 1032. The medium hanging points 1032 press against the fusion hole to reduce the pressure. After the external pressure disappears, the pressure is restored. In this way, the pressure is reduced by the dense medium hanging points 1032, thereby improving the tensile strength of the power conduit 100. It has strong adaptability, simple operation, wide application scenarios, and high practicality.

[0037] The above provides a detailed description of a composite trenchless MPP power pipe provided by this utility model. The specific embodiments are described only to aid in understanding the method and core concept of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A composite trenchless MPP power conduit, comprising an inner pipe and an outer pipe arranged coaxially, and a composite protective layer disposed between the inner pipe and the outer pipe, characterized in that, The composite protective layer includes an inner liner, a support mesh, and an outer liner. A fusion layer covering the support mesh is disposed between the inner liner and the outer liner. The support mesh has linear arrayed fusion holes, and the medium in the fusion layer passes through the fusion holes. A medium hanging point is integrally disposed at each fusion hole, and the medium hanging point has elastic support on the side of the fusion layer corresponding to the outer liner.

2. The composite trenchless MPP power pipe according to claim 1, characterized in that, A liner is provided between the inner tube and the support mesh to form the inner lining layer.

3. The composite trenchless MPP power conduit according to claim 1 or 2, characterized in that, A protective pipe is provided between the support net and the outer pipe to form the outer lining layer; or, another support net is provided between the support net and the outer pipe to form the outer lining layer, and the medium hanging points of the two support nets are arranged opposite to each other.

4. The composite trenchless MPP power pipe according to claim 1, characterized in that, The support mesh is a spirally wound support sheet, and the support sheet is provided with a linear array of fusion holes. Each column of fusion holes is recessed by a first distance, which is less than the spacing of the linear array.

5. The composite trenchless MPP power conduit according to claim 1 or 4, characterized in that, The shape of the fusion hole is one of triangle, semi-circle, and square.

6. The composite trenchless MPP power pipe according to claim 4, characterized in that, The medium hanging points on the support network are integrally formed by the support sheet during injection molding or stamping of the fusion holes.

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