A reinforced polyethylene winding composite pipe

Abstract

The present invention relates to a reinforced polyethylene wound composite pipe, comprising a pipe body formed by spirally winding, overlapping, and bonding strips, and a hollow reinforcement structure spirally wound and bonded to the outer surface of the pipe body in the form of a spiral protrusion. After the strips are spirally wound into the pipe body, a recess is formed on the outer surface of the pipe body. The hollow reinforcement structure comprises a hollow reinforcement body and clips formed by extending from the sides of the hollow reinforcement body. The hollow reinforcement structure overlaps the overlapping portion of the strips to form a multi-layer staggered, overlapping, and bonded structure. The inner and outer edges formed when the strips are spirally wound are both within the width of the hollow reinforcement structure. After the strips are spirally wound to form the pipe body, the clips and the strips form a multi-layer, overlapping, and bonded structure. The reinforcement structure, through the clips and the strips, forms a multi-layer staggered, overlapping structure, thereby increasing the strength of the bonded portion and simultaneously forming a multi-axial force combined force, dispersing the axial force of the composite pipe and improving the safety factor of the composite pipe.

Description

Technical Field

[0001] The invention belongs to the field of pipelines, and in particular relates to a reinforced polyethylene winding composite pipe. Background Art

[0002] Corrugated pipe is a new type of pipe with an annular outer wall and a smooth inner wall. The wound corrugated pipe is a pipe of unlimited length obtained by continuous winding. It is a new type of lightweight pipe mostly made of high-density polyethylene. The outer wall has an annular corrugated structure, which greatly enhances the ring stiffness of the pipe, thereby enhancing the pipe's resistance to soil load. It has the characteristics of light weight, high pressure resistance, good toughness and fast construction, and is used to replace concrete pipes and cast iron pipes.

[0003] In order to improve production efficiency, simplify the molding process and reduce production costs, most of the current corrugated pipes adopt a winding molding structure, where the pipe body is wound and the annular structure is also wound.

[0004] However, in the winding process, considering the strength of the corrugated pipe, overlapping winding bonding is stronger than butt winding bonding. However, no matter what, there are still bonding parts in spiral winding. Therefore, how to improve the strength of the bonding parts is an important factor to be considered in composite pipe forming. Summary of the Invention

[0005] The present invention provides a reinforced polyethylene wound composite pipe, in which clips extend from the side of the reinforcement structure of the outer corrugation. After the strip is spirally wound to form the pipe body, the clips and the strip form a multi-layer overlapping bonding structure. In addition, the reinforcement structure forms a multi-layer staggered overlapping structure through the clips and the strip, thereby improving the strength of the bonding part and forming a multiple axial force resultant force, dispersing the axial force of the composite pipe and improving the safety factor of the composite pipe.

[0006] The specific technical solution of the present invention is: a reinforced polyethylene wrapped composite pipe, including a pipe body formed by spirally winding, overlapping and bonding strips, and a hollow reinforcement structure spirally wound and bonded to the surface of the pipe body to form a spiral protrusion. After the strips are spirally wound into the pipe body, a recess is formed on the surface of the pipe body. The hollow reinforcement structure includes a hollow reinforcement body and a clip extended from the side of the hollow reinforcement body. The hollow reinforcement structure overlaps on the overlapping part of the strips and forms a multi-layer staggered overlapping bonding structure. The inner and outer edges formed when the strips are spirally wound are both within the width of the hollow reinforcement structure.

[0007] The pipe body is formed by spirally winding and overlapping the strips, and the hollow reinforcement structure is superimposed on the overlapping parts of the strips. In this way, the composite pipe forms a multi-layer staggered overlapping structure at the location of the hollow reinforcement structure, which forms a bidirectional force on the overlapping and bonding parts of the strips, thereby reducing the axial force on the overlapping and bonding parts of the strips, and the bonding is more reliable and stable; after the strips are spirally wound and overlapped to form the pipe body, a concave portion is formed on the surface of the pipe body, which is formed when the strips are wound, and the hollow reinforcement structure is spirally wound to close the concave portion to form an empty groove. The empty groove provides a space for accommodating the deformation of the composite pipe, so that the composite pipe can be It deforms toward the empty groove, and the deformation in this direction does not affect the internal shape of the composite pipe, nor does it weaken the strength of the composite pipe. The hollow reinforcement structure extends a clip on the side of the hollow reinforcement body. When spirally wound, the hollow reinforcement body overlaps the overlapping part of the strip, or the clip overlaps the overlapping part of the strip. The inner edge and the outer edge refer to the side edges of adjacent strips that are butted together when the strip is spirally wound. The inner edge is on the inner surface of the tube body, and the outer edge is on the outer surface of the tube body. Both the inner edge and the outer edge are within the width of the hollow reinforcement structure, that is, both the inner edge and the outer edge are pressed and protected by the hollow reinforcement structure.

[0008] As a preferred embodiment, the strip is a sheet-like structure, with upper and lower overlapping edges provided on both sides of the strip. The upper and lower overlapping edges are complementary stepped structures. The width of the upper overlapping edge is smaller than that of the lower overlapping edge, and the upper overlapping edge overlaps the lower overlapping edge. The portion where the width of the lower overlapping edge is greater than that of the upper overlapping edge forms a concave portion on the outer surface of the tube body. The strip has upper and lower overlapping edges. When spirally wound, the upper and lower overlapping edges overlap and bond, with the bonding surface being on the axial circumferential surface. The overlapping bonding surface between the hollow reinforcement structure and the tube body is also on the axial circumferential surface, aligning with the axial resistance of the composite tube, thereby improving the axial resistance of the composite tube.

[0009] As a preferred embodiment, the inner edge is located below the clip on the outside of the hollow reinforcement body, and the width of the recess outside the tube body is less than or equal to the width of the hollow reinforcement body. In other words, the outer edge is located near the side of the hollow reinforcement body or below the hollow reinforcement body. This increases the axial length of the overlapping and bonded strips, thereby improving the overall strength of the tube body.

[0010] As a preferred solution, a hollow reinforcement structure is helically wrapped and bonded to the outer tube body, closing the recess to form an empty slot, within which a steel strip is helically wrapped. The steel strip is a flat plate with its flat surface aligned with the bottom of the recess, or a corrugated structure with the undulations oriented along the axis of the composite tube. The hollow reinforcement structure closes the recess to form an empty slot, within which the steel strip is wound, thereby increasing the ring stiffness of the composite tube. The helically wrapped steel strip is located on the outer surface of the tube, effectively constraining it and improving its safety and stability.

[0011] As a preferred solution, the width of the clip is the width of the valley between adjacent wave crests on the surface of the composite tube, and the clips of the front circle of the hollow reinforcement structure are bonded to the side edges of the rear circle of the hollow reinforcement body.

[0012] As a preferred embodiment, the width of the clip is greater than the width of the trough between adjacent wave crests on the composite tube's exterior. The bottom of the subsequent hollow reinforcement body overlaps and is bonded to the clip of the previous hollow reinforcement structure. The clip width is greater than the width of the trough, so that the subsequent hollow reinforcement body overlaps the clip and upper overlap edge of the previous hollow reinforcement structure. In this case, the overlapping locations of the hollow reinforcement body are not on the same circumferential surface, causing the hollow reinforcement body to tilt during the winding process. This tilt precisely compensates for the tilt of the linear hollow reinforcement structure during spiral winding.

[0013] As a preferred embodiment, the strip material has a roughened surface, and the hollow reinforcement structure has a corresponding roughened surface. When the hollow reinforcement structure is spirally wound around the tube body, the roughened surfaces correspond to each other, and the hollow reinforcement structure conceals the exposed roughened surface. The roughened surface strengthens the bonding between the spiral reinforcement structure and the tube body.

[0014] As a preferred solution, the surface of the rough portion is a sawtooth structure, and the tops of the sawteeth extend along the length direction of the strip.

[0015] As a preferred solution, the hollow reinforcement body adopts a trapezoidal structure, consisting of a co-extruded inner PP tube and an outer PE layer. Alternatively, the hollow reinforcement body adopts a co-extruded trapezoidal structure, consisting of an inner PE layer, a middle PP tube, and an outer PE layer. The PP inner tube is a circumferentially closed structure, and the clips are extensions of the PE outer layer. The spiral reinforcement structure has a PP inner tube, a PP outer layer, and a PE outer layer, thereby improving the hoop stiffness of the composite tube while reducing PE usage and lowering costs.

[0016] As a preferred solution, the hollow reinforced body adopts double PP inner tubes, both of which are right-angled trapezoidal structures, with the two right-angled sides facing each other and bonded.

[0017] The beneficial effects of the present invention are as follows: 1. The tube body is formed by spirally winding and overlapping strips, and the hollow reinforcement structure is superimposed on the overlapping parts of the strips. In this way, the composite tube forms a multi-layer staggered overlapping structure at the location of the hollow reinforcement structure, which generates a bidirectional force on the overlapping and bonding parts of the strips, thereby reducing the axial force on the overlapping and bonding parts of the strips, and making the bonding more reliable and stable;

[0018] 2. After the strips are spirally wound, overlapped, and bonded into a tube body, a concave portion is formed on the surface of the tube body. The concave portion is formed when the strips are wound. When the hollow reinforcement structure is spirally wound, the concave portion is closed to form an empty groove. The empty groove provides space for the composite tube to deform, so that the composite tube can deform toward the empty groove during the cooling process. The deformation in this direction does not affect the internal shape of the composite tube, nor does it weaken the strength of the composite tube.

[0019] 3. The hollow reinforcement structure extends a clip from the side of the hollow reinforcement body. When spirally wound, the hollow reinforcement body overlaps the overlapping part of the strip, or the clip overlaps the overlapping part of the strip; the inner edge and the outer edge refer to the adjacent side edges of the strip being butted together when the strip is spirally wound. The inner edge is on the inner surface of the tube body, and the outer edge is on the outer surface of the tube body. Both the inner edge and the outer edge are within the width of the hollow reinforcement structure, that is, both the inner edge and the outer edge are compressed and protected by the hollow reinforcement structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 is a schematic structural diagram of embodiment 2 of the present invention;

[0022] Figure 3 This invention Figure 2 An exploded schematic diagram of the structure shown;

[0023] Figure 4 is a schematic structural diagram of embodiment 3 of the present invention;

[0024] Figure 5 is an exploded schematic diagram of Inventive Example 4;

[0025] Figure 6 is an exploded schematic diagram of Inventive Example 5;

[0026] Figure 7 It is a structural schematic diagram of a hollow reinforcement structure of the present invention;

[0027] Figure 8 It is a structural schematic diagram of another hollow reinforcement structure of the present invention;

[0028] In the figure: 1. Hollow reinforcement structure, 2. Tube body, 3. Clip, 4. Inner edge, 5. Upper lap edge, 6. Strip, 7. Lower lap edge, 8. Empty groove, 9. Rough part, 10. Steel strip, 11. PE outer layer, 12. PP inner tube, 13. PE inner layer, 14. Right-angle edge. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to specific embodiments and in conjunction with the accompanying drawings.

[0030] Example 1:

[0031] like Figure 1 The figure shows a reinforced polyethylene wound composite pipe comprising a pipe body 2 formed by spirally winding, overlapping, and bonding strips 6, and a hollow reinforcement structure 1 spirally wound and bonded to the pipe body, forming a spiral protrusion. The strips are spirally wound into the pipe body, forming a concave portion on the pipe body. The hollow reinforcement structure comprises a hollow reinforcement body and clips 3 extending from the sides of the hollow reinforcement body. The hollow reinforcement structure overlaps the overlapping portions of the strips, forming a multi-layer, staggered, and overlapped bonded structure. The inner and outer edges formed by the spirally wound strips are both within the width of the hollow reinforcement structure.

[0032] The strip is a sheet-like structure, with an upper lap edge 5 and a lower lap edge 7 on either side. These two edges form a complementary stepped structure. The thickness of the upper lap edge is equal to that of the lower lap edge, and each is slightly less than half the thickness of the strip. The upper lap edge overlaps and bonds with the lower lap edge, with the overlapped thickness equal to the thickness of the strip. The bonding surface is located on the axial circumferential surface, and the overlapping bonding surface between the hollow reinforcement structure and the tube body is also located on the axial circumferential surface, aligning with the axial resistance of the composite tube. The width of the upper lap edge is smaller than that of the lower lap edge, overlapping the lower lap edge. The width of the lower lap edge is smaller than that of the hollow reinforcement structure, and greater than that of the hollow reinforcement body. The area where the lower lap edge is wider than the upper lap edge forms a concave portion on the tube surface. After the strip is spirally wound, the inner lap edge is located below the clamping piece.

[0033] The width of the recess is equal to the width of the hollow reinforcement body. The hollow reinforcement structure is spirally wrapped outside the tube body. The hollow reinforcement body just overlaps with the recess. The side edge of the upper overlapping edge is bonded to the side edge of the corresponding hollow reinforcement body. The clip overlaps the upper overlapping edge. The clip, upper overlapping edge and lower overlapping edge form a three-layer staggered overlapping bonding structure.

[0034] The width of the clip is the axial length of the bottom of the valley between two adjacent wave peaks on the surface of the composite tube. The clip of the front circle of the hollow reinforcement structure is bonded to the side of the rear circle of the hollow reinforcement body. The width of the clip is greater than the width of the upper overlapping edge. The bottom surface of the clip is not flush with the outer bottom surface of the hollow reinforcement body. There is a height difference between the two bottom surfaces, which is the thickness of the upper overlapping edge.

[0035] The hollow reinforcement structure is formed by PE extrusion as a whole. The hollow reinforcement body is a trapezoidal structure with a circumferentially closed hollow cavity with a trapezoidal cross section inside.

[0036] Alternatively, the hollow reinforced body adopts a trapezoidal structure formed by co-extrusion of an inner PP inner tube 12 and an outer PE outer layer 11, and the clip is formed by extending from the side of the PE outer layer.

[0037] Example 2:

[0038] like Figure 2 Figure 3 The following is a reinforced polyethylene wound composite pipe. This pipe differs from Example 1 in that the width of the recess is smaller than the width of the hollow reinforcement body. When the hollow reinforcement structure is wound around the pipe, the hollow reinforcement body closes the recess to form a hollow groove 8. The clips of the hollow reinforcement structure overlap the upper lap edge. The bottom surface of the clips is flush with the bottom surface of the hollow reinforcement body. The sides of the bottom surface of the hollow reinforcement body overlap the middle surface of the previous coil and the upper lap edge of the next coil, respectively. The remaining structure is similar to that of Example 1.

[0039] Example 3:

[0040] like Figure 4 As shown, a strong polyethylene wound composite pipe differs from Example 2 in that the width of the clip is greater than the axial length of the bottom of the trough between two adjacent wave peaks on the composite pipe surface. The bottom of the rear hollow reinforcement body overlaps and is bonded to the clip of the previous hollow reinforcement structure. The left side of the bottom of the hollow reinforcement body overlaps the overlapping and bonded area of ​​the strip and the clip, and the right side overlaps the overlapping and bonded area of ​​the upper and lower overlapping edges of the strip. In this way, the left side of the hollow reinforcement body is higher than the right side by the thickness of the clip. This height difference appropriately adjusts the tilt of the hollow reinforcement structure during spiral winding, that is, the hollow reinforcement structure is corrected to an upright position after spiral winding. The remaining structure refers to Example 2.

[0041] Example 4:

[0042] like Figure 5 As shown, a strong polyethylene wound composite pipe is different from Example 2 in that: a rough portion 9 is provided on the surface of the strip, and a rough portion is provided on the corresponding part of the hollow reinforcement structure. When the hollow reinforcement structure is spirally wound outside the tube body, the rough portions correspond to each other, and the hollow reinforcement structure covers the rough portion exposed outside the tube body. The surface of the rough portion is a serrated structure, and the tooth tops of the serrations extend along the length direction of the strip. In this embodiment, the rough portions of the hollow reinforcement structure are located on both sides of the bottom surface of the hollow reinforcement body, and the rough portions of the strip are located on both sides of the outer surface of the upper overlapping edge of the strip. After the hollow reinforcement structure is spirally wound, the rough portions correspond to each other and mesh with each other and are located exactly on both sides of the recess. The remaining structures refer to Example 2.

[0043] Example 5:

[0044] like Figure 6As shown, a strong polyethylene wrapped composite pipe is different from Example 2 in that: the hollow reinforcement structure is spirally wrapped and bonded to the outside of the pipe body and the recess is closed to form an empty slot, and a steel strip 10 is spirally wrapped in the empty slot. The steel strip is a flat structure, and the plane of the flat steel strip is fitted with the bottom of the recess, or the steel strip is a corrugated structure, and the undulating direction of the corrugation is along the axial direction of the composite pipe. In this embodiment, the width of the steel strip is equal to the width of the recess, and the two sides of the steel strip are in contact with the two side edges of the recess. The steel strip adopts a trapezoidal corrugated plate, and the two sides of the steel strip are folded vertically. The overall height of the trapezoidal corrugated plate is equal to the height of the empty slot. The strip is spirally wrapped, overlapped and bonded to form a recess, and the steel strip 11 is spirally wrapped in the recess. Finally, the spiral reinforcement structure is spirally wrapped to close the recess. The rest of the structure refers to Example 2.

[0045] Example 6:

[0046] like Figure 7 The figure shows a reinforced polyethylene wound composite pipe. The hollow reinforcement structure in this embodiment is a three-layer co-extruded trapezoidal structure, comprising an inner PE layer 13, a middle PP inner tube 12, and an outer PE outer layer 11. The PP inner tube is a circumferentially closed structure. The clips extend from the sides of the PE outer layer.

[0047] Example 7:

[0048] like Figure 8 As shown, a strong polyethylene wound composite pipe, the hollow reinforcement structure of this embodiment adopts a double PP inner pipe structure, both PP inner pipes are right-angled trapezoidal structures, the right-angled sides 14 of the two PP inner pipes are opposite and bonded. The outside of the two PP inner pipes is a PE outer layer.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A reinforced polyethylene winding composite pipe, characterized in that: The invention comprises a tube body (2) formed by spirally winding, overlapping and bonding a strip (6), and a hollow reinforcement structure (1) spirally wound and bonded to the outer surface of the tube body to form a spiral protrusion. After the strip is spirally wound into the tube body, a concave portion is formed on the outer surface of the tube body. The hollow reinforcement structure comprises a hollow reinforcement body and a clip (3) formed by extending from the side of the hollow reinforcement body. The hollow reinforcement body has a circumferentially closed hollow cavity. The hollow reinforcement structure overlaps on the overlapping portion of the strip and forms a multi-layer staggered overlapping bonding structure. The inner and outer edges formed when the strip is spirally wound are both within the width of the hollow reinforcement structure. The hollow reinforcement structure presses the inner and outer edges. The hollow reinforcement structure is spirally wound and bonded to the outer surface of the tube body and the concave portion is closed to form a hollow groove (8).

2. The reinforced polyethylene wound composite pipe according to claim 1, characterized in that: The strip is a sheet-like structure, with an upper lap edge (5) and a lower lap edge (7) provided on both sides of the strip, the upper lap edge and the lower lap edge being complementary stepped structures; the width of the upper lap edge is smaller than the width of the lower lap edge, the upper lap edge overlaps the lower lap edge, and the portion where the width of the lower lap edge is larger than the width of the upper lap edge forms a concave portion on the outer surface of the tube body.

3. The reinforced polyethylene wound composite pipe according to claim 1 or 2, characterized in that: The inner edge is located below the clip outside the hollow reinforcement body, and the width of the concave portion outside the tube body is less than or equal to the width of the hollow reinforcement body.

4. The reinforced polyethylene wound composite pipe according to claim 2, characterized in that: A steel strip (10) is spirally wound in the empty groove; the steel strip is a flat plate structure, with the plane of the flat plate steel strip being fitted with the bottom of the recess; or the steel strip is a corrugated structure, with the undulation direction of the corrugations being along the axial direction of the composite pipe.

5. The reinforced polyethylene wound composite pipe according to claim 1, characterized in that: The width of the clip is the width of the valley between adjacent wave crests on the surface of the composite pipe. The clip of the front circle hollow reinforcement structure is bonded to the side of the back circle hollow reinforcement body.

6. The reinforced polyethylene wound composite pipe according to claim 1, characterized in that: The width of the clip is greater than the width of the valley between adjacent wave crests on the surface of the composite pipe. The bottom of the rear circle of hollow reinforcement bodies overlaps and is bonded to the clip of the front circle of hollow reinforcement structures.

7. A reinforced polyethylene wound composite pipe according to claim 1 or 2 or 5 or 6, characterized in that: The surface of the strip is provided with a rough portion (9), and a corresponding portion of the hollow reinforcement structure is provided with a rough portion. When the hollow reinforcement structure is spirally wound outside the tube body, the rough portions correspond to each other, and the hollow reinforcement structure covers the rough portion exposed outside the tube body.

8. The reinforced polyethylene wound composite pipe according to claim 7, characterized in that: The surface of the rough portion is a sawtooth structure, and the tooth tops of the sawtooth extend along the length direction of the strip.

9. The reinforced polyethylene wound composite pipe according to claim 1, 2, 5 or 6, characterized in that: The hollow reinforcement body adopts a trapezoidal structure formed by co-extrusion of an inner PP inner tube (12) and an outer PE outer layer (11), or the hollow reinforcement body adopts a trapezoidal structure formed by co-extrusion of an inner PE inner layer (13), an intermediate PP inner tube, and an outer PE outer layer; wherein the PP inner tube is a circumferentially closed structure; and the clip is formed by extending the PE outer layer.

10. The reinforced polyethylene wound composite pipe according to claim 1 or 2 or 5 or 6, characterized in that: The hollow reinforced main body adopts double PP inner tubes, both of which are right-angled trapezoidal structures, and the two right-angled sides (14) are opposite and bonded.

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