High performance wound corrugated pipe

Abstract

The embodiment of the application discloses a high-performance winding corrugated pipe, which comprises a polyethylene pipe body, a spiral reinforcing structure is arranged on the polyethylene pipe body; the spiral reinforcing structure is formed by spiral winding of a plurality of mesh steel belts coated with polyethylene material; wherein uniform holes are distributed on the mesh steel belt, the inner wall and the outer wall of the holes are both penetrated by polyethylene material to anchor the mesh steel belt and the polyethylene material into an integral whole; adjacent mesh steel belts are left with a welding gap in the winding direction, and a point welding structure is arranged at the gap to connect the adjacent mesh steel belts. Through cooperation of the mesh steel belt and the polyethylene material, the corrugated pipe is formed, and meanwhile, the corrugated pipe has the characteristics of high ring stiffness, firm interlayer combination and being suitable for large-diameter, and the production cost is controllable.

Description

Technical Field

[0001] This application relates to the field of pipe design technology, and in particular to a high-performance spiral wound corrugated pipe. Background Technology

[0002] Steel-reinforced polyethylene spiral corrugated pipes are widely used in municipal drainage and sewage engineering projects due to their high ring stiffness and large-diameter production capacity. Currently, there are two main technical approaches for this type of pipe on the market: Firstly, there is the double-walled polyethylene corrugated pipe. While this type of pipe is corrosion-resistant, its ring stiffness is relatively low, making it prone to deformation under complex geological conditions or large external loads. Furthermore, it struggles to meet the production demands of large-diameter pipes, limiting its application. Secondly, there is the steel-reinforced polyethylene spiral corrugated pipe. This type of pipe significantly improves ring stiffness through its built-in steel strip skeleton, but it suffers from a long-standing, unresolved inherent defect: the linear expansion coefficients of the steel strip and the polyethylene material differ greatly. When ambient temperature changes or internal medium temperature fluctuates, their thermal expansion and contraction are asynchronous, easily leading to delamination between the steel strip and the polyethylene layer. Once delamination occurs, the pipe's ring stiffness drops sharply, losing its reinforcing effect and severely impacting the pipe's long-term service life and engineering safety.

[0003] Furthermore, in the water supply sector, high ring stiffness pipes are typically made of ductile iron or steel, which have poor corrosion resistance. Plastic composite pipes, while offering corrosion resistance (such as steel wire mesh reinforced polyethylene composite pipes), generally suffer from insufficient ring stiffness, making them prone to deformation during transportation, installation, and use. Therefore, there is an urgent need for a new type of composite pipe structure that can maintain both high ring stiffness and corrosion resistance while fundamentally solving the problem of interlayer delamination. Utility Model Content

[0004] The main objective of this application is to provide a high-performance wound corrugated pipe, which aims to solve the problem of poor quality of existing corrugated pipe structures.

[0005] To achieve the above objectives, this application proposes a high-performance wound corrugated pipe, comprising a polyethylene pipe body, wherein a spiral reinforcement structure is wound on the polyethylene pipe body; The spiral reinforcement structure is formed by spirally winding a steel strip with several holes coated with polyethylene material. The perforated steel strip has uniformly distributed holes, and the inner and outer walls of the holes are covered with polyethylene material to anchor the perforated steel strip and the polyethylene material into a whole. The adjacent perforated steel strips have a welding gap in the winding direction, and a spot welding structure is provided at the welding gap to connect the adjacent perforated steel strips.

[0006] For example, in the high-performance wound corrugated pipe provided in at least one embodiment of this application, at least two uncoated exposed holes are provided at each end of the perforated steel strip.

[0007] For example, in the high-performance wound corrugated pipe provided in at least one embodiment of this application, the diameter of the pores is not less than 5 mm, and the spacing between adjacent pores is not greater than 10 mm.

[0008] For example, in the high-performance spiral wound corrugated pipe provided in at least one embodiment of this application, the welding length of the point welding structure is not less than 5 mm, and the number of welding points along the circumference of the pipe is greater than 10.

[0009] For example, in at least one embodiment of the high-performance spiral corrugated pipe provided in this application, the polyethylene pipe body includes an outer pipe layer integrally formed inside the spiral reinforcement structure, and the outer pipe layer is fused with the outer polyethylene through the exposed cavity and the welding gap.

[0010] For example, in the high-performance spiral corrugated pipe provided in at least one embodiment of this application, the polyethylene pipe body further includes a reinforcing layer and an inner pipe layer, the outer pipe layer and the inner pipe layer are respectively located on both sides of the reinforcing layer, and the reinforcing layer is a composite layer of steel wire and adhesive resin or glass fiber and adhesive resin.

[0011] For example, in the high-performance wound corrugated pipe provided in at least one embodiment of this application, a polyethylene outer layer is fused to the trough formed by adjacent perforated steel strips, and the height from the outer surface of the polyethylene outer layer to the outer surface of the perforated steel strip is not less than 3 mm.

[0012] For example, in the high-performance wound corrugated pipe provided in at least one embodiment of this application, the material of the perforated steel strip is low-carbon cold-rolled steel strip or low-carbon hot-rolled steel strip.

[0013] Compared with existing polyethylene double-wall corrugated pipes, the corrugated pipe of this application has at least the following beneficial effects: By coating the inner and outer walls of the cavities distributed on the perforated steel strip with polyethylene material, the inner and outer polyethylene layers flow through the cavities and fuse together under extrusion and molten conditions, forming a mechanical connection similar to "rivets" at the cavities. This structure does not rely on the chemical adhesive force of adhesives, but rather firmly anchors the steel strip and polyethylene together through physical interlocking. Even in high and low temperature alternating environments, the constraint effect of the "rivet" structure can effectively prevent the steel strip from peeling off from the polyethylene layer, improving structural stability and durability. At the same time, through the combination of "welding gap" and "point welding structure," while ensuring flexibility, the overall integrity and ring stiffness of the spiral skeleton are greatly improved, avoiding the problems of excessive rigidity and insufficient flexibility caused by continuous overlapping of steel strips. When the pipe is under pressure, the stress is transmitted and dispersed through the welding points in the spiral reinforced structure skeleton, jointly resisting deformation, so that the pipe obtains a ring stiffness far higher than that of traditional structures. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 This is a simplified structural diagram of an embodiment of the high-performance wound bellows of this application; Figure 2 This is the initial machining drawing for the perforated steel strip of this application; Figure 3 This is a forming and processing diagram of the perforated steel strip in this application; Figure 4 This is a cross-sectional structural diagram of an embodiment of the high-performance wound corrugated pipe of this application; Figure 5 This is a cross-sectional structural diagram of an embodiment of the polyethylene pipe body of this application; Figure 6 This is a simplified structural diagram of another embodiment of the high-performance wound bellows of this application; Figure 7 This is a cross-sectional view of another embodiment of the high-performance wound bellows of this application; Reference numerals: 10. Spiral reinforcement structure; 11. Perforated steel strip; 12. Polyethylene material; 13. Hole; 14. Uncoated hole; 15. Point-welded structure; 20. Polyethylene pipe body; 21. Inner layer of pipe; 22. Reinforcing layer; 23. Outer layer of pipe; 24. Outer wall of pipe; The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0018] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0019] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0020] Existing spiral corrugated pipes, whether through double-wall structures or steel strip reinforcement to increase diameter support, each have their own drawbacks in practical applications. For example, double-wall structures have limited load-bearing capacity and are susceptible to deformation under soil loads, ground dynamic loads, and groundwater buoyancy. Steel strip reinforcement is more susceptible to aging and failure due to temperature-induced expansion changes, influenced by its structural design. Therefore, this application improves upon the steel strip structure to avoid the problems that may exist in the application of existing spiral pipes.

[0021] Example 1 In one embodiment of a high-performance wound corrugated pipe provided in this application, such as Figure 1 As shown, the corrugated pipe includes a polyethylene pipe body 20 and a spiral reinforcement structure 10, which is wound around the polyethylene pipe body 20. The spiral reinforcement structure 10 is formed by spirally winding several perforated steel strips 11 coated with polyethylene material 12. The perforated steel strips 11 have uniformly distributed cavities 13, and the inner and outer walls of the cavities 13 are covered with polyethylene material 12 to anchor the perforated steel strips 11 and the polyethylene material 12 into a whole. Adjacent perforated steel strips 11 have welding gaps in the winding direction, and point welding structures 15 are provided at the welding gaps to connect adjacent perforated steel strips 11.

[0022] Taking drainage pipes as an example, the corrugated pipe of this application can be manufactured and processed through the following process: like Figure 2 As shown, firstly, a steel strip of a specified width is passed through a punching device to form a perforated steel strip 11 with holes 13. Then, as... Figure 3 The polyethylene material 12 is coated onto the inner and outer walls of the perforated steel strip 11 using an extrusion device. The perforated steel strip 11 is then processed into an arch shape, with the ends of the strip not coated. The polyethylene material 12 on the inner and outer walls of the perforated steel strip 11 forms a "rivet" structure with a fixing function through the holes 13, thereby enhancing the strength of this part of the structure and preventing delamination caused by thermal expansion. Next, the coated perforated steel strip 11 is subjected to pressure rollers and a forming machine to form a spiral corrugated structure. During the formation of the spiral corrugated structure, a certain gap is left between adjacent perforated steel strips 11, i.e., a welding gap. Each perforated steel strip 11 is fixed by point welding through this welding gap. Finally, the welded spiral corrugated coated perforated steel strip 11 is extruded using an extrusion device and a forming die to form a wound corrugated pipe. Figure 4 As shown, the spiral corrugated pipe, with its unique spiral reinforcement structure 10, improves the structural strength at the diameter. Furthermore, the anchoring structure formed by plastic coating on the perforated structure effectively resists peeling and delamination caused by thermal expansion, ensuring the quality and service life of the corrugated pipe.

[0023] In the above embodiments, this application also provides the following embodiments to further improve the practical performance of the wound bellows.

[0024] Optionally, the material of the perforated steel strip 11 includes, but is not limited to, low-carbon cold-rolled steel strip, low-carbon hot-rolled steel strip, etc.; low-carbon steel strip has good flexibility and is easy to process into corrugated shape, which can effectively reduce production and processing costs.

[0025] Optionally, the perforated steel strip 11 has holes 13, which are evenly distributed and of uniform size, with a hole diameter ≥ 5 mm and a spacing between two holes ≤ 10 mm. By adjusting the forming dimensions of the "rivet structure," the polyethylene material 12 coated on the perforated steel strip 11 can achieve a better anchoring effect. A larger hole diameter allows sufficient polyethylene material 12 to form a high-strength "rivet," while a smaller spacing ensures the density of the anchoring points and a uniform distribution of the bonding force.

[0026] Optionally, the polyethylene tube 20 is achieved by bonding a polyethylene sheet to the bottom of the corrugated perforated steel strip 11. In terms of processing specifications, the width of the sheet can be consistent with the plastic coating width at the bottom of the corrugated perforated steel strip. To ensure the adaptability of the bonding, the raw material of the sheet is preferably consistent with the polyethylene raw material of the plastic-coated perforated steel strip 11.

[0027] Specifically, the polyethylene sheet thickness is ≥2mm, and the single-sided bonding distance between the sheet and the corrugated perforated steel strip is ≥10mm. In one embodiment, the polyethylene pipe body 20 can be implemented using a sheet metal structure or processed using a wedge-and-mortise structure, making the pipe body easy to assemble and possessing good structural strength. For details, see [link to documentation]. Figure 5 One end of the polyethylene sheet is processed into a shape (section) with a wedge structure by a molding die, and the other end is processed into a corresponding assembly structure, thereby forming a pipe base assembled end to end, realizing the extension of the pipe body.

[0028] Optionally, the spot welding structure 15 involves intermittent welding of the welding gap along a circumference; for example, maintaining a welding gap width ≥2mm and ≤5mm, a welding length ≥5mm, and more than 10 welding points on a circumference. Sufficient welding length and the number of welding points ensure the strength and stability of the connection between adjacent steel strips, effectively transferring and dispersing stress along the pipe wall, preventing premature failure of the connection points, and providing a reliable structural guarantee for high ring stiffness.

[0029] Furthermore, in the above embodiments, during the processing of the perforated steel strip 11, each end of the perforated steel strip 11 has at least two uncoated cavities 14. The extrusion equipment extrudes molten polyethylene material 12, which flows into the corrugated interior through the uncoated cavities 14 and the unwelded gaps at the troughs. By limiting the corrugated interior with the forming mold and extruding the polyethylene material 12 at the troughs, the molten polyethylene material 12 is fused internally to form the inner wall of the pipe or to fuse with the polyethylene pipe body 20, thereby improving the integration of the spiral reinforced structure 10 and the polyethylene pipe body 20. At the same time, the uncoated cavities 14 and the unwelded gaps at the troughs are also formed by the polyethylene material 12 to form a "rivet structure" with a fixing function. Optionally, the molten polyethylene material 12 fuses two adjacent perforated steel strips 11 together at the trough, forming the outer wall 24 of the tube. In particular, the height of the formed outer wall 24 from the perforated steel strip 11 is ≥3mm, which helps to enhance the structural strength of the joint.

[0030] Example 2 Taking water supply pipes as an example, the corrugated pipe of this application can also be manufactured and processed through the following process: like Figure 2 First, a steel strip of a specified width is punched through a punching device to form a perforated steel strip 11 with holes 13. Then, as... Figure 3 The polyethylene material 12 is coated onto the inner and outer walls of the perforated steel strip 11 using an extrusion device, and the perforated steel strip 11 is processed into an arch shape with the ends of the steel strip uncoated. Then, the coated perforated steel strip 11 is subjected to pressure rollers and a forming machine to form a spiral corrugated structure. During the formation of the spiral corrugated structure, a certain gap is left between adjacent perforated steel strips 11, i.e., a welding gap. Each perforated steel strip 11 is fixed by point welding through this welding gap. Finally, the welded spiral corrugated coated perforated steel strip 11 is extruded and formed into a wound corrugated pipe using an extrusion device and a forming die.

[0031] The above processing procedure is the same as that in Example 1, except that the polyethylene pipe body 20 includes an outer pipe layer 23 integrally formed inside the spiral reinforcement structure 10. The outer pipe layer 23 is formed by welding with the outer polyethylene through exposed uncoated cavities 14 and welding gaps. In addition, it also includes a reinforcement layer 22 and an inner pipe layer 21. The outer pipe layer 23 and the inner pipe layer 21 are respectively located in two layers of the reinforcement layer 22. The reinforcement layer 22 is a composite layer of steel wire and adhesive resin or glass fiber and adhesive resin.

[0032] For details, see Figure 6 , Figure 7The extrusion equipment extrudes molten polyethylene material 12 through the uncoated cavities 14 and unwelded gaps at the troughs formed by the perforated steel strip 11, which flow into the outer wall of the reinforcing layer 22. By extruding the polyethylene material 12 at the troughs, the molten polyethylene material 12 is fused to the outer wall of the reinforcing layer 22 to form the outer layer 23 of the pipe. In particular, the uncoated cavities 14 and unwelded gaps at the troughs also form a "rivet structure" with a fixing function. The composite structure formed with the reinforcing layer 22 and the inner layer 21 of the pipe allows the pipe structure to withstand high internal and external pressure at the same time. The steel wire / glass fiber reinforcing layer 22 provides good tensile strength and dimensional stability, making it a high-performance composite pressure pipe.

[0033] Optionally, the material of the perforated steel strip 11 includes, but is not limited to, low-carbon cold-rolled steel strip, low-carbon hot-rolled steel strip, etc.; low-carbon steel strip has good flexibility and is easy to process into corrugated shape, which can effectively reduce production and processing costs.

[0034] Optionally, the reinforcing layer 22 is a composite layer consisting of steel wire and adhesive resin or glass fiber and adhesive resin.

[0035] Optionally, after the polyethylene material 12 forms the outer layer 23 of the tube, it extends through the uncoated cavities to the trough formed by the perforated steel strip 11, forming the outer wall 24 of the threaded tube. The height of the outer wall 24 to the perforated steel strip 11 is ≥3mm, which helps to enhance the structural strength of the connection.

[0036] Optionally, the outer wall of the reinforcing layer 22 and the molten polyethylene material 12 are stably heated at the fusion joint with the polyethylene at the trough to ensure the reliability of this part of the tube.

[0037] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A high-performance wound corrugated pipe, characterized in that, Includes a polyethylene pipe body, on which a spiral reinforcement structure is wound; The spiral reinforcement structure is formed by spirally winding a steel strip with several holes coated with polyethylene material. The perforated steel strip has uniformly distributed holes, and the inner and outer walls of the holes are covered with polyethylene material to anchor the perforated steel strip and the polyethylene material into a whole. The adjacent perforated steel strips have a welding gap in the winding direction, and a spot welding structure is provided at the welding gap to connect the adjacent perforated steel strips.

2. The high-performance wound corrugated pipe according to claim 1, characterized in that: At least two uncoated exposed holes are provided at each end of the perforated steel strip.

3. The high-performance wound corrugated pipe according to claim 1, characterized in that, The diameter of the hole is not less than 5 mm, and the distance between adjacent holes is not greater than 10 mm.

4. The high-performance wound corrugated pipe according to claim 1, characterized in that, The welding length of the point welding structure is not less than 5mm, and the number of welding points along the circumference of the pipe is greater than 10.

5. The high-performance wound corrugated pipe according to claim 2, characterized in that, The polyethylene tube body includes an outer tube layer integrally formed inside the spiral reinforcement structure, and the outer tube layer is fused with the outer polyethylene through the exposed holes and the welding gap.

6. The high-performance wound corrugated pipe according to claim 5, characterized in that, The polyethylene pipe body also includes a reinforcing layer and an inner pipe layer, with the outer pipe layer and the inner pipe layer located on both sides of the reinforcing layer. The reinforcing layer is a composite layer of steel wire and adhesive resin or glass fiber and adhesive resin.

7. The high-performance wound corrugated pipe according to claim 1, characterized in that, The outer wall of the tube is fused to the trough formed by adjacent perforated steel strips, and the height of the outer wall of the tube from the outer surface of the perforated steel strip is not less than 3mm.

8. The high-performance wound corrugated pipe according to claim 1, characterized in that, The perforated steel strip is made of low-carbon cold-rolled steel strip or low-carbon hot-rolled steel strip.

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