Steel rib reinforced polyolefin composite pipe

Abstract

The utility model belongs to the polyolefin pipe material technical field discloses a kind of steel rib reinforced ribbed polyolefin composite pipe, including pipe body, pipe body is by one or more layers of steel-plastic composite strip spiral winding and is connected by hot fusion joint seam;The reinforcing rib of spiral winding fixation is provided with with hot fusion joint seam same line on pipe body outer wall;Steel-plastic composite strip is the sandwich structure of base layer, reinforcing framework layer and cover layer, and reinforcing framework layer can use the steel strip of coating adhesive resin, pressed groove steel strip or steel fiber belt.The utility model sets up reinforcing rib in the hot fusion joint seam of weak axial direction simultaneously, significantly improves the axial tensile strength, compression strength and pressure-bearing capacity of pipe material, effectively solves the installation fracture, interface leakage and settlement deformation problem caused by insufficient axial force of traditional winding pipe, simultaneously has excellent ring stiffness, sealing property and corrosion resistance, prolongs service life.

Description

Technical Field

[0001] This utility model belongs to the field of polyolefin pipe technology, specifically relating to a steel rib reinforced polyolefin composite pipe. Background Technology

[0002] Polyethylene (PE) pipes are widely used in water supply and drainage, municipal pipe networks, and other projects due to their excellent corrosion resistance and flexibility. Existing spiral wound pipes (such as spiral wound (B) type pipes and steel-reinforced PE spiral corrugated pipes) mainly rely on their circumferential structure to withstand external and internal pressure, but their axial mechanical properties are often insufficient. Dragging and handling during construction and installation can easily lead to tensile fracture, cracking of hot-melt welds, or local buckling of the pipe body. Under conditions of uneven settlement and ground loading, the pipe body cannot withstand additional tensile / compressive loads axially, which may cause pipe deformation, joint leakage, or even structural failure. Furthermore, weak areas in the axial stress of the pipe body (such as hot-melt joints) can accelerate local erosion by soil, sewage, and other media, shortening its service life. Therefore, developing a composite pipe that can significantly improve axial strength has significant engineering value. Utility Model Content

[0003] The purpose of this utility model is to provide a steel-ribbed reinforced polyolefin composite pipe to improve the ring stiffness, tensile strength and corrosion resistance of the pipe and extend its service life.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A steel-ribbed reinforced polyolefin composite pipe includes a pipe body, which is formed by spirally winding one or more layers of steel-plastic composite strip and connecting them by hot-melt; a reinforcing rib is spirally wound and fixed on the outer wall of the pipe body, and the reinforcing rib is arranged in the same line as the hot-melt joint of the pipe body.

[0006] To further improve the ring stiffness and tensile strength of the pipe, the reinforcing ribs are made of one or more layers of steel-plastic composite strips that are spirally wound and hot-melt bonded to the outer wall of the pipe.

[0007] To further improve the corrosion resistance of the pipe and extend its service life, the steel-plastic composite strip includes a base layer, a reinforcing skeleton layer, and a cover layer. The reinforcing skeleton layer is embedded between the base layer and the cover layer. The reinforcing skeleton layer can be made of steel strip coated with adhesive resin, grooved steel strip, or steel fiber strip (steel strip and grooved steel strip include perforated and non-perforated types).

[0008] Furthermore, the multi-layer steel-plastic composite strip of the tube body can use the same or different reinforcing skeleton layers.

[0009] Furthermore, the cross-section of the reinforcing rib is trapezoidal, circular, semi-circular, or polygonal.

[0010] Furthermore, the groove shape of the grooved steel strip is Ω-shaped or multi-wave-shaped.

[0011] Furthermore, when the steel-plastic composite strip of the reinforcing rib uses an Ω-shaped grooved steel strip as the reinforcing skeleton layer, the reinforcing rib has a hollow structure.

[0012] Furthermore, the steel fiber tape is a strip formed by multiple cold-drawn steel wires arranged side by side or woven together.

[0013] Furthermore, the inner wall of the tube is uniformly covered with a polyolefin inner layer, the thickness of which is 2-10 mm.

[0014] Furthermore, the polyolefin inner layer, base layer, and cladding layer are all made of one or more blended materials of polyolefins.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects:

[0016] 1. The pipe body of this utility model adopts a composite sheet of "polyethylene with steel reinforcement material" spirally wound, with a tight steel-plastic bond. Combined with the structural characteristics of steel strip (such as punched or grooved type), it greatly improves the ring stiffness and resistance to external pressure. Reinforcing ribs are set on the same line on the hot melt joint of the pipe body to specifically strengthen the weak area of ​​the weld. It can effectively resist axial stress such as construction dragging and foundation settlement, avoid local stress concentration, prevent joint cracking or pipe body damage, and improve the overall mechanical stability.

[0017] 2. This utility model, by setting a polyolefin inner layer on the inner wall of the pipe, can completely isolate the conveying medium such as sewage and soil from the internal steel reinforcement structure, avoid corrosion, and significantly extend the service life of the pipe.

[0018] 3. The composite pipe of this utility model retains the excellent ring stiffness of traditional spiral pipes, while expanding the application scenarios and being able to adapt to projects with complex geology, high construction requirements, or ground loads; at the same time, it can also avoid media erosion caused by premature failure due to axial deformation, and the pipeline system has a long service life. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present invention;

[0020] Figure 2 This is a cross-sectional view of Embodiment 1 of the present invention;

[0021] Figure 3 This is a three-dimensional structural diagram of Embodiment 2 of the present invention;

[0022] Figure 4 This is a cross-sectional view of Embodiment 2 of the present invention;

[0023] Figure 5This is a cross-sectional view of Embodiment 2 of the present invention;

[0024] Figure 6 This is a cross-sectional view of Embodiment 3 of the present invention;

[0025] Figure 7 This is a cross-sectional view of Embodiment 4 of the present invention;

[0026] Figure 8 This is a cross-sectional view of Embodiment 5 of the present invention.

[0027] In the diagram: Pipe body 1, joint 11, reinforcing rib 2, polyolefin inner layer 3, steel-plastic composite strip 4, base layer 41, cladding layer 42, steel strip 43, grooved steel strip 44, steel fiber strip 45. Detailed Implementation

[0028] The following detailed description illustrates the specific implementation method:

[0029] Example 1

[0030] like Figure 1-2 As shown, a steel-ribbed reinforced polyolefin composite pipe includes a pipe body 1, which is formed by spirally winding a layer of steel-plastic composite strip 4 and connecting it by hot melt. During the production of the steel-plastic composite strip 4, a base layer 41 is first extruded, then a reinforcing skeleton layer is laid on the base layer 41 simultaneously, and finally a cover layer 42 is extruded on the reinforcing skeleton layer and then rolled and formed by heated rollers. In this embodiment, the reinforcing skeleton layer is a steel strip 43 coated with adhesive resin, and both the base layer 41 and the cover layer 42 are made of one or more mixed materials of polyolefin.

[0031] After the steel-plastic composite strip 4 is heated, it is wound on a smooth spiral winding mandrel. The edges of the steel-plastic composite strip 4 overlap or butt each other and are welded by heating and pressurizing to form a strong hot-melt joint 11, thereby forming the tube body 1. The tube body 1 structure provides the ring stiffness and circumferential strength required for the composite pipe.

[0032] To improve the axial strength of the composite pipe, a trapezoidal reinforcing rib 2 is spirally wound around the outside of the hot-melt joint 11 of the pipe body 1. The reinforcing rib 2 is made of one or more layers of steel-plastic composite strip sheet, which is the same as or similar to the pipe body 1, and is bonded to the pipe body 1 to form a whole. In this embodiment, the reinforcing rib 2 is made of one layer of steel-plastic composite strip sheet. The reinforcing rib 2 directly covers and strengthens the weakest axial joint 11 area, enabling it to effectively resist axial tensile and compressive loads. It can be adapted to projects with complex geology, high construction requirements, or ground loads. At the same time, it can also avoid media erosion caused by premature axial deformation and further extend the service life of the pipeline system.

[0033] Example 2

[0034] like Figure 3-5 As shown, the difference between this embodiment and Embodiment 1 is that the cross-section of the reinforcing rib 2 is semi-circular, and the reinforcing skeleton layer of the steel-plastic composite strip 4 uses grooved steel strip 44, the groove shape of which can be Ω-shaped (e.g., Figure 4 (as shown) or multiple waveforms (such as) Figure 5 (as shown); Figure 4 As shown, when the Ω-shaped grooved steel strip 44 is used, the reinforcing rib 2 is a hollow structure.

[0035] Example 3

[0036] like Figure 6 As shown, the difference between this embodiment and embodiment 1 is that the tube body 1 is made of two layers of steel-plastic composite strip 4 spirally wound and connected by hot melt. The reinforcing structure of both the tube body 1 and the reinforcing rib 2 is made of steel fiber strip 45, which is a strip formed by multiple cold-drawn steel wires arranged side by side or woven.

[0037] Example 4

[0038] The difference between this embodiment and embodiment 3 is that the reinforcing structure of the two layers of steel-plastic composite strips 4 in the pipe body 1 adopts any two of the following: steel strip 43, grooved steel strip 44, or steel fiber strip 45, as shown in the attached diagram. Figure 7 Steel strip 43 and steel fiber strip 45 are used as the reinforcing structure of the tube body 1 respectively; the cross section of the reinforcing rib 2 is semi-circular, and the reinforcing structure of the reinforcing rib 2 is made of steel strip 43.

[0039] Example 5

[0040] like Figure 8 As shown, the difference between this embodiment and Embodiment 1 is that: steel fiber tape 45 is used as the reinforcing skeleton layer of pipe body 1 and reinforcing rib 2; in order to further improve the corrosion resistance of the composite pipe, during the pipe forming process, one or more mixed materials in polyolefin are extruded through an internal extrusion die to form a strip of polyethylene melt onto the mandrel surface, so that during the winding forming process of pipe body 1, the strip of polyethylene melt is evenly coated on the inner wall of pipe body 1, forming a polyolefin inner layer 3 with a thickness of 2-10mm, so that the inner wall of pipe body 1 is completely sealed, which can completely isolate sewage, soil and other transport media from the internal steel reinforcement structure, avoid corrosion, and significantly extend the service life of the pipe.

[0041] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A steel-ribbed reinforced polyolefin composite pipe, characterized in that: The tube body (1) is made by spirally winding one or more layers of steel-plastic composite strip (4) and connecting them by hot melt; the outer wall of the tube body (1) is spirally wound with reinforcing ribs (2), and the reinforcing ribs (2) and the hot melt joint (11) of the tube body (1) are set in the same line.

2. The steel-ribbed reinforced polyolefin composite pipe according to claim 1, characterized in that: The reinforcing rib (2) is made of one or more layers of steel-plastic composite strip (4) which are spirally wound and hot-melted bonded to the outer wall of the tube body (1).

3. The steel-ribbed reinforced polyolefin composite pipe according to claim 1 or 2, characterized in that: The steel-plastic composite strip (4) includes a base layer (41), a reinforcing skeleton layer and a cover layer (42). The reinforcing skeleton layer is embedded between the base layer (41) and the cover layer (42). The reinforcing skeleton layer is made of steel strip (43), grooved steel strip (44) or steel fiber strip (45) coated with adhesive resin.

4. The steel-ribbed reinforced polyolefin composite pipe according to claim 3, characterized in that: The multi-layer steel-plastic composite strip (4) of the tube body (1) can use the same or different reinforcing skeleton layers.

5. The steel-ribbed reinforced polyolefin composite pipe according to claim 3, characterized in that: The cross-section of the reinforcing rib (2) is trapezoidal, circular, semi-circular or polygonal.

6. The steel-ribbed reinforced polyolefin composite pipe according to claim 3, characterized in that: The grooved steel strip (44) has an Ω-shaped or multi-wave-shaped groove.

7. The steel-ribbed reinforced polyolefin composite pipe according to claim 3, characterized in that: When the steel-plastic composite strip (4) of the reinforcing rib (2) is made of Ω-shaped grooved steel strip (44) as the reinforcing skeleton layer, the reinforcing rib (2) is a hollow structure.

8. The steel-ribbed reinforced polyolefin composite pipe according to claim 3, characterized in that: The steel fiber tape (45) is a strip formed by multiple cold-drawn steel wires arranged side by side or woven together.

9. The steel-ribbed reinforced polyolefin composite pipe according to claim 3, characterized in that: The inner wall of the tube (1) is uniformly covered with a polyolefin inner layer (3), and the thickness of the polyolefin inner layer (3) is 2-10 mm.

Images