Buried high-rib PP reinforced polyethylene winding pipe

Abstract

The utility model relates to the technical field of spiral corrugated pipes, in particular to a buried high-rib PP reinforced polyethylene winding pipe which comprises a winding pipe body formed by spirally winding a plurality of extrusion main bodies. A hollow protruding part is wound on the pipe body of the winding pipe; an overlapping connecting part is arranged between every two adjacent extrusion main bodies; a cross grid component of a space truss-shaped structure is arranged in the hollow protruding part. And the overlapping connecting parts are connected through mortises and tenons. The problems of pipe body collapse deformation and stress concentration at the joint caused by insufficient support of an existing hollow structure can be solved, and the ring stiffness and the deformation resistance can be remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of spiral corrugated pipe technology, specifically to a buried high-strength PP-reinforced polyethylene spiral pipe. Background Technology

[0002] Buried high-strength PP-reinforced polyethylene spiral pipe is a composite material pipe made primarily of high-density polyethylene (HDPE) and polypropylene (PP), widely used in buried drainage, sewage, and municipal engineering projects. Patent CN211693849U discloses a double-high-strength reinforced polyethylene spiral pipe, which enhances the local strength of the pipe body through a combination of PP material connecting parts and HDPE protrusions. However, this structure still has the following drawbacks:

[0003] 1. The hollow protrusion adopts a single HDPE thin-walled cavity design, which is prone to collapse and deformation under the pressure of the soil cover and the dynamic load of vehicles. Due to the lack of an effective support system inside the hollow cavity, the ring stiffness of the pipe is insufficient. Actual measurements show that under the standard burial depth of 3 meters, the ellipticity deviation of the pipe diameter exceeds 7%, resulting in an imbalance of stress distribution between the pipe and the soil.

[0004] 2. Adjacent extruded bodies rely solely on the overlapping of the upper and lower planes of the PP connector, resulting in limited contact area. Under dynamic loads, microcracks easily form and propagate at the connector, accelerating structural failure. Although the composite design of PP and HDPE improves the material's toughness, the difference in the thermal expansion coefficients of the two materials can induce interfacial shear stress in alternating temperature environments, further weakening the compressive stability of the hollow structure.

[0005] The aforementioned defects severely restrict the reliability of this structure in heavy traffic areas and soft soil foundation scenarios. Therefore, it is urgent to optimize the mechanical properties of the hollow cavity through an innovative support system. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a buried high-strength PP-reinforced polyethylene spiral pipe to solve the problems of pipe collapse and deformation and stress concentration at the connection caused by insufficient support of the existing hollow structure, and to significantly improve the ring stiffness and deformation resistance.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A buried high-strength PP-reinforced polyethylene spiral wound pipe includes a spiral wound pipe body, which is formed by spirally winding multiple extrusion bodies; a hollow protrusion is wound on the spiral wound pipe body; an overlapping connection is provided between two adjacent extrusion bodies; a cross-grid component with a spatial truss structure is provided inside the hollow protrusion; the overlapping connection is achieved by tenon and mortise joints.

[0009] As a further embodiment of this utility model: the cross-grid member includes a support rib and a plurality of reinforcing ribs; the support rib is disposed on the inner side of the hollow protrusion and extends along the winding direction of the hollow protrusion; the plurality of reinforcing ribs are arranged at intervals along the hollow protrusion, and all the reinforcing ribs are sleeved on the support rib to form a spatial truss structure.

[0010] As a further embodiment of this utility model: the cross-section of the reinforcing rib is triangular, the outer side of the reinforcing rib is narrow and the inner side is wide, and the outer side is circumferentially embedded in the inner wall of the hollow protrusion.

[0011] As a further improvement of this utility model, the cross-section of the supporting rib is wavy.

[0012] As a further embodiment of this utility model: wherein, the upper contact surface of the overlapping connection part is provided with the tenon of the mortise and tenon, and the lower contact surface of the overlapping connection part is provided with the mortise and tenon groove of the mortise and tenon, and the tenon and mortise and tenon groove are compatible dovetail shapes.

[0013] As a further embodiment of this utility model: the cross-section of the hollow protrusion is trapezoidal, and the bottom surface of the hollow protrusion is connected to the extrusion body.

[0014] By adopting the above technical solution, this utility model will have the following beneficial effects:

[0015] This utility model provides a buried high-strength PP-reinforced polyethylene spiral pipe. By incorporating a spatial truss-like cross-grid component within the hollow protrusion, the cross-grid component transforms the hollow structure within the protrusion into a spatial truss. This meets lightweight requirements while significantly enhancing the compressive and bending resistance of the hollow protrusion, thereby improving the pipe's ring stiffness. Furthermore, the overlapping area of ​​the overlapping joint features a tenon and mortise structure, achieving mechanical interlocking through hot-melt welding. This greatly improves connection strength. Compared to a simple top-and-bottom overlapping connection, it avoids the risk of misalignment during the spiral winding of the extruded main body and prevents pipe collapse and deformation due to insufficient support in the hollow protrusion. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a schematic cross-sectional view of the buried high-strength PP-reinforced polyethylene spiral pipe according to an embodiment of the present invention.

[0018] Figure 2 for Figure 1 A perspective view of the hollow protrusion described in the embodiment;

[0019] Figure 3 for Figure 1 A perspective view of the cross-grid component described in the embodiment.

[0020] The correspondence between the labels and component names in the attached figures is as follows:

[0021] 1. Extruded main body; 11. Overlapping connection part; 2. Hollow protrusion part; 3. Cross grid component; 31. Support rib; 32. Reinforcing rib; 4. Tenon and mortise. Detailed Implementation

[0022] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the following description is to be considered exemplary in nature and not restrictive.

[0023] Please refer to Figure 1 In one embodiment of the buried high-strength PP-reinforced polyethylene spiral pipe provided by this utility model, the buried high-strength PP-reinforced polyethylene spiral pipe includes a spiral pipe body, which is formed by spirally winding multiple extrusion bodies 1; a hollow protrusion 2 made of HDPE is coaxially wound on the outer circumferential surface of the spiral pipe body; an overlapping connection part 11 is provided between two adjacent extrusion bodies 1, and each pair of extrusion bodies 1 is connected end to end through the overlapping connection part 11; the overlapping connection part 11 is made of PP material and is formed by stacking the two ends of two adjacent extrusion bodies 1, which can increase the area of ​​connection between two adjacent extrusion bodies 1. The above is a conventional design with reference to the prior art.

[0024] Importantly, the hollow protrusion 2 is provided with a cross-grid member 3 of a spatial truss-like structure, which can transform the hollow structure in the hollow protrusion 2 into a spatial truss; the overlapping area of ​​the overlapping connection part 11 is provided with a tenon and mortise structure 4, which achieves mechanical interlocking through hot melt welding.

[0025] Specifically, such as Figure 2 and Figure 3As shown, the cross-grid component 3 includes support ribs 31 and multiple reinforcing ribs 32. The support ribs 31 are located on the inner side of the hollow protrusion 2 and extend along the winding direction of the hollow protrusion 2 to distribute axial loads. The multiple reinforcing ribs 32 are arranged at intervals along the hollow protrusion 2 to enhance radial compressive strength. All reinforcing ribs 32 are fitted over the support ribs 31 to form a spatial truss-like structure, enhancing overall rigidity and resistance to deformation, effectively preventing the hollow protrusion 2 from collapsing. It should be noted that the reinforcing ribs 32 and support ribs 31 are co-extruded using HDPE, and the support structure is embedded simultaneously during the production of the hollow protrusion 2.

[0026] More specifically, the cross-section of the reinforcing rib 32 is an isosceles triangle, narrow on the outside and wide on the inside. The outer side of the reinforcing rib 32 is embedded in the inner wall of the hollow protrusion 2 in a ring shape to form a closed grid support. The embedding depth of the reinforcing rib 32 is 1 / 3 of the wall thickness of the hollow protrusion 2. The cross-section of the support rib 31 is wavy, and the height is 1 / 3 of the height of the hollow protrusion 2. The two sides of the support rib 31 are close to the two bottom corners of the hollow protrusion 2.

[0027] Specifically, such as Figure 1 As shown, the upper contact surface of the overlapping connection part 11 is provided with a tenon of the tenon 4, the width of which accounts for 40% of the total width of the connection part. The lower contact surface of the overlapping connection part 11 is provided with a mortise of the tenon 4, the depth of which is 3mm. The tenon and the mortise are matching dovetail shapes with a dovetail angle of 60°±2°. The open end of the mortise is 3mm wider than the closed end.

[0028] Specifically, such as Figure 1 As shown, the cross-section of the hollow protrusion 2 can be trapezoidal, and the bottom surface of the hollow protrusion 2 can be wrapped and connected to the extruded body 1 through a hot winding process to improve the compressive strength of the hollow protrusion 2.

[0029] The method of use or working principle of this utility model is as follows:

[0030] Under the action of soil pressure and vehicle dynamic load, (1) when the outer wall of the hollow protrusion 2 is deformed by pressure, the reinforcing rib 32 bends, so that the stress is diffused to the annular closed structure of the reinforcing rib 32. At the same time, the adjacent reinforcing ribs work together to bear the load, forming a continuous anti-compression arch effect, and jointly dispersing the external load; (2) when the winding pipe body is bent or twisted and deformed, the supporting rib 31 extends along the winding direction, so it can decompose the external load into tensile force and circumferential force, disperse the stress distribution, and improve the bending resistance of the winding pipe body; (3) when the connection between the extruded main bodies 1 is subjected to dynamic load, the tenon 4 structure of the overlapping connection part 11 can achieve mechanical interlocking through hot melt welding, further improving the compressive stability of the hollow protrusion 2.

[0031] 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 buried high-strength PP-reinforced polyethylene spiral wound pipe, comprising a spiral wound pipe body, wherein the spiral wound pipe body is formed by spirally winding multiple extrusion bodies (1); a hollow protrusion (2) is wound on the spiral wound pipe body; and an overlapping connection part (11) is provided between two adjacent extrusion bodies (1); characterized in that, The hollow protrusion (2) is provided with a cross-grid component (3) of a spatial truss structure; the overlapping connection part (11) is connected by tenon and mortise (4).

2. The buried high-strength PP-reinforced polyethylene spiral pipe according to claim 1, characterized in that, The cross-grid member (3) includes a support rib (31) and a plurality of reinforcing ribs (32); the support rib (31) is disposed on the inner side of the hollow protrusion (2) and extends along the winding direction of the hollow protrusion (2); the plurality of reinforcing ribs (32) are arranged at intervals along the hollow protrusion (2), and all the reinforcing ribs (32) are sleeved on the support rib (31) to form a spatial truss structure.

3. The buried high-strength PP-reinforced polyethylene spiral pipe according to claim 2, characterized in that, The cross-section of the reinforcing rib (32) is triangular. The reinforcing rib (32) is narrow on the outside and wide on the inside, and the outer side is circumferentially embedded in the inner wall of the hollow protrusion (2).

4. The buried high-strength PP-reinforced polyethylene spiral pipe according to claim 2 or 3, characterized in that, The cross-section of the support rib (31) is wavy.

5. The buried high-strength PP-reinforced polyethylene spiral pipe according to claim 1, characterized in that, The upper contact surface of the overlapping connection part (11) is provided with the tenon of the tenon (4), and the lower contact surface of the overlapping connection part (11) is provided with the mortise of the tenon (4). The tenon and the mortise are matching dovetail shapes.

6. The buried high-strength PP-reinforced polyethylene spiral pipe according to claim 1, characterized in that, The hollow protrusion (2) has a trapezoidal cross-section, and the bottom surface of the hollow protrusion (2) is connected to the extrusion body (1).

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