Buried MPVE high-strength steel-plastic composite pipe

Abstract

The utility model discloses a buried MPVE high-strength steel-plastic composite pipe which is formed by spirally winding strip-shaped pipe sections in the axial direction and connecting gap joints formed between every two adjacent circles of pipe sections after spiral winding is completed through secondary forming. By means of the design that the strip-shaped pipe sections are spirally wound in the axial direction and the fit clearance connection positions are connected through secondary forming, the structure is simple, and the ring stiffness and the overall connection strength of the composite pipe are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drainage pipelines, in particular to a buried MPVE high-strength steel-plastic composite pipe. Background Art

[0002] The steel-plastic composite pipe is a new type of composite pipe. The traditional steel-plastic composite pipes are all connected by overlapping the pipe walls, and the pipe walls are generally overlapped in inner and outer double layers, resulting in complex processes, complex product structures, low ring stiffness and poor overall strength.

[0003] So far, there is an urgent need to find a new steel-plastic composite pipe with large ring stiffness and high overall strength. Summary of the Utility Model

[0004] In view of the above problems, the utility model provides a buried MPVE high-strength steel-plastic composite pipe with simple structure, large ring stiffness and high overall strength.

[0005] The technical solution of the utility model is: a buried MPVE high-strength steel-plastic composite pipe, which is made by spirally winding strip-shaped pipe sections along the axial direction, and after the spiral winding is completed, the gap joints formed between adjacent two turns of pipe sections are connected by secondary forming.

[0006] The working principle of the above technical solution is as follows:

[0007] By spirally winding strip-shaped pipe sections along the axial direction and cooperating with the design of connecting the gap joints by secondary forming, not only the structure is simple, but also the ring stiffness and overall connection strength of the composite pipe are greatly improved.

[0008] In a further technical solution, the pipe section includes a plastic outer layer, an inner pipe wall layer and a steel strip. An adaptation space is formed between the plastic outer layer and the inner pipe wall layer, and the steel strip is arranged in the adaptation space; wherein, the plastic outer layer and the steel strip are completely adhered to each other. Through the cooperative design of the plastic outer layer, the inner pipe wall layer and the steel strip, the ring stiffness and overall connection strength of the composite pipe are further improved.

[0009] In a further technical solution, when connecting by secondary forming at the gap joint, an adhesive is respectively immersed and adhered in the gaps between adjacent two turns of the plastic outer layer parts, the gaps between adjacent two turns of the steel strip parts and the gaps between adjacent two turns of the inner pipe wall layer parts, so that the gap joints formed between adjacent two turns of pipe sections after the spiral winding is completed are connected by secondary forming and adhesion. Through the design of connecting the gap joints formed between adjacent two turns of pipe sections after the spiral winding is completed by secondary forming and adhesion, not only the ring stiffness and overall connection strength of the composite pipe are improved, but also the preparation of the composite pipe is made simpler, and the manufacturing cost is greatly saved.

[0010] In a further technical solution, an adhesive connection with a "T"-shaped cross-section is formed at the gap connection. Through the design of forming an adhesive connection with a "T"-shaped cross-section at the gap connection, the adhesion is made more reliable, and the overall connection strength of the composite pipe is improved.

[0011] In a further technical solution, connection holes are provided on both sides of the steel strip. When performing secondary forming connection at the gap connection, the adhesive is respectively immersed and bonded in the gaps between adjacent two circles of the plastic outer layer parts, the gaps between adjacent two circles of the steel strip parts, and the gaps between adjacent two circles of the pipe wall inner layer parts, and the part of the plastic outer layer located at the gap connection is extruded into the connection holes until it is connected to the pipe wall inner layer, so that a secondary forming adhesive connection is formed at the gap connection formed between adjacent two circles of pipe sections after spiral winding is completed. Through the combined design of the connection holes and the secondary forming adhesive connection, not only is the adhesion more reliable, further improving the overall connection strength of the composite pipe, but also the ring stiffness of the composite pipe is further enhanced.

[0012] In a further technical solution, the cross-section of the steel strip is in the shape of type type type or type. Through the design of the cross-section of the steel strip being in the shape of type type type or type, it can meet the requirements of different application environments.

[0013] In a further technical solution, the pipe wall inner layer is made of an anti-corrosion and wear-resistant layer and a PE material layer. Through the design of the pipe wall inner layer being made of an anti-corrosion and wear-resistant layer and a PE material layer, on the basis of having the advantages of the PE material, the anti-corrosion and wear-resistant ability of the composite pipe is further improved.

[0014] The beneficial effects of the present utility model are:

[0015] 1. By spirally winding strip-shaped pipe sections in the axial direction and cooperating with the design of secondary forming connection at the gap connection, not only is the structure simple, but also the ring stiffness and overall connection strength of the composite pipe are greatly improved.

[0016] 2. Through the combined design of the plastic outer layer, the pipe wall inner layer and the steel strip, the ring stiffness and overall connection strength of the composite pipe are further improved.

[0017] 3. The design of forming a connection by secondary forming bonding at the gap connection between adjacent two turns of the pipe section after spiral winding not only improves the ring stiffness and overall connection strength of the composite pipe, but also makes the preparation of the composite pipe simpler and greatly saves the manufacturing cost.

[0018] 4. The design of forming a bonding connection with a "T"-shaped cross-section at the gap connection makes the bonding more reliable and improves the overall connection strength of the composite pipe.

[0019] 5. The combined design of the connection hole and the secondary forming bonding connection not only makes the bonding more reliable, further improves the overall connection strength of the composite pipe, but also further enhances the ring stiffness of the composite pipe.

[0020] 6. By the design that the cross-section of the steel strip is type, type, type or type, it can meet the requirements of different application environments.

[0021] 7. By the design that the inner layer of the pipe wall is made of an anti-corrosion and wear-resistant layer and a PE material layer, on the basis of having the advantages of the PE material, the anti-corrosion and wear-resistant ability of the composite pipe is further improved. Brief Description of the Drawings

[0022] Figure 1 is the axial sectional view of the buried MPVE high-strength steel-plastic composite pipe described in Embodiment 1 of the present utility model;

[0023] Figure 2 is the connection schematic diagram between two pipe sections of the buried MPVE high-strength steel-plastic composite pipe described in Embodiment 1 of the present utility model;

[0024] Figure 3 is the axial sectional view of a pipe section of the buried MPVE high-strength steel-plastic composite pipe described in Embodiment 1 of the present utility model;

[0025] Figure 4 is the connection schematic diagram between two pipe sections of the buried MPVE high-strength steel-plastic composite pipe described in Embodiment 2 of the present utility model.

[0026] Description of the Reference Numerals:

[0027] 1 - steel strip; 2 - inner layer of the pipe wall; 3, 4 - bonding connection; 5 - anti-corrosion and wear-resistant layer; 6 - PE material layer; 7 - connection hole; 8 - plastic outer layer. Detailed Embodiments

[0028] The embodiments of the present utility model will be further described below with reference to the drawings.

[0029] Embodiment 1:

[0030] As shown Figures 1 - 3 in the figure, a buried MPVE high-strength steel-plastic composite pipe is formed by spirally winding strip-shaped pipe sections along the axial direction. After the spiral winding is completed, the gaps formed between adjacent turns of the pipe sections are connected by secondary forming.

[0031] The working principle of the above technical solution is as follows:

[0032] By spirally winding strip-shaped pipe sections along the axial direction and cooperating with the design of connecting the gaps by secondary forming, the structure is not only simple, but also greatly improves the ring stiffness and overall connection strength of the composite pipe.

[0033] In another embodiment, the pipe section includes a plastic outer layer 8, an inner pipe wall layer 2, and a steel strip 1. An adaptation space is formed between the plastic outer layer 8 and the inner pipe wall layer 2, and the steel strip 1 is disposed in the adaptation space; wherein, the plastic outer layer 8 and the steel strip 1 are completely adhered to each other. Through the cooperative design of the plastic outer layer 8, the inner pipe wall layer 2, and the steel strip 1, the ring stiffness and overall connection strength of the composite pipe are further improved.

[0034] In another embodiment, when connecting by secondary forming at the gap connection, an adhesive is respectively immersed and adhered in the gaps between adjacent turns of the plastic outer layer parts, the gaps between adjacent turns of the steel strip 1 parts, and the gaps between adjacent turns of the inner pipe wall layer parts, so that the gap connection formed between adjacent turns of the pipe sections after the spiral winding is completed is connected by secondary forming and bonding 3. Through the design of connecting the gap connection formed between adjacent turns of the pipe sections after the spiral winding is completed by secondary forming and bonding 3, not only the ring stiffness and overall connection strength of the composite pipe are improved, but also the preparation of the composite pipe is made simpler, greatly saving the manufacturing cost.

[0035] In another embodiment, a bonding connection 3 with a cross-section in the shape of a "T" is formed at the gap connection. Through the design of forming a bonding connection 3 with a cross-section in the shape of a "T" at the gap connection, the bonding is made more reliable, enhancing the overall connection strength of the composite pipe.

[0036] In another embodiment, the cross-section of the steel strip 1 is in the shape of type, type, type or type. Through the design of the cross-section of the steel strip 1 being in the shape of type, type, type or type, it is to meet the requirements of different application environments and places.

[0037] In another embodiment, the inner layer 2 of the pipe wall is made of an anti-corrosion and wear-resistant layer 5 and a PE material layer 6. Through the design that the inner layer 2 of the pipe wall is made of the anti-corrosion and wear-resistant layer 5 and the PE material layer 6, on the basis of having the advantages of the PE material, the anti-corrosion and wear-resistant ability of the composite pipe is further improved.

[0038] Embodiment 2:

[0039] As Figure 4 shown, the other structures of this Embodiment 2 are the same as those of Embodiment 1. The difference lies in that connecting holes 7 are provided on both sides of the steel strip 1. When performing secondary forming connection at the gap connection, adhesives are respectively immersed and bonded in the gaps between adjacent two circles of the plastic outer layer part (equivalent to the edge parts on both sides of the plastic outer layer), the gaps between adjacent two circles of the steel strip parts (equivalent to the edge parts on both sides of the steel strip), and the gaps between adjacent two circles of the inner layer part of the pipe wall (equivalent to the edge parts on both sides of the pipe wall inner layer 2), and the part of the plastic outer layer 8 located at the gap connection is extruded into the connecting holes 7 until it is connected to the pipe wall inner layer 2 (during the secondary forming process, the connection parts of the plastic outer layer 8 and the pipe wall inner layer will be melted together to form a bond), so that the gap connection formed between adjacent two circles of pipe sections after the spiral winding is completed is connected by secondary forming bonding 4. Through the combined design of the connecting holes 7 and the secondary forming bonding connection 4, not only the bonding is more reliable, further improving the overall connection strength of the composite pipe, but also the ring stiffness of the composite pipe is further enhanced.

[0040] The above-described embodiments only represent the specific implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A buried MPVE high-strength steel-plastic composite pipe, characterized in that: The composite tube is made by spirally winding strip-shaped tube segments in the axial direction, and after the spiral winding is completed, the gaps formed between two adjacent turns of the tube segments are connected by secondary molding; The pipe section comprises a plastic outer layer, a pipe wall inner layer and a steel belt. An adaption space is formed between the outer plastic layer and the inner tube wall layer, and the steel belt is arranged in the adaption space; wherein the outer plastic layer and the steel belt are completely in contact with each other; When the gap joint is connected by secondary molding, the gap between two adjacent plastic outer layers, the gap between two adjacent steel strips, and the gap between two adjacent pipe wall inner layers are respectively immersed in and bonded by adhesive, so that the gap joint formed between two adjacent pipe segments after the spiral winding is completed is connected by secondary molding and bonding; A "T"-shaped adhesive connection is formed at the gap junction; Connection holes are provided on both sides of the steel belt. When the gap joint is connected by secondary molding, the adhesive is respectively immersed in and bonded to the gap between two adjacent circles of the plastic outer layer parts, the gap between two adjacent circles of the steel belt parts, and the gap between two adjacent circles of the tube wall inner layer parts, and the part of the plastic outer layer located at the gap joint is squeezed into the connection hole until it is connected to the tube wall inner layer, so that the gap joint formed between two adjacent circles of the tube section parts after the spiral winding is completed is connected by secondary molding and bonding.

2. The buried MPVE high-strength steel-plastic composite pipe according to claim 1 is characterized in that: The inner layer of the pipe wall is made of an anti-corrosion and wear-resistant layer and a PE material layer.

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