Spiral steel pipe with upset side

Abstract

The utility model relates to the technical field of materials for municipal engineering, in particular to a side-upset spiral steel pipe which comprises a steel pipe body, the steel pipe body is formed by spirally winding a steel belt, the steel belt is provided with a side edge, the side edge of the steel belt is upset to form an upset part, the upset part is provided with an outer side face, and the outer side face is provided with an inner side face. Welding areas are arranged between the outer side surfaces of the adjacent steel strips, and welding flux is filled into the welding areas for welding connection; the welding area is a groove with a chambering outside, and the welding area is welded and connected at the groove; the steel pipe body is provided with an inner cavity and an inner side surface, and the upsetting part does not exceed the inner side surface in the inner cavity; or the steel pipe body is provided with an outer part and an outer side surface, and the upsetting part at the outer part does not exceed the outer side surface. The steel pipe has the advantages of being high in bearing capacity and durable.

Description

Technical Field

[0001] This utility model relates to the field of materials technology for municipal engineering, specifically to steel pipes. Background Technology

[0002] The steel pipes mentioned above are widely used in the transportation of natural gas, urban water, heating networks, and water supply and drainage. Among them, a type of spiral steel pipe is widely used in this field.

[0003] The spiral steel pipe is made by spirally winding steel strips. The steel strips have sides. In order to increase the strength of the steel pipe, the sides of the steel strips are upset to form upset thick sections. The upset thick sections have outer surfaces. The outer surfaces of adjacent steel strips are welding zones. Welding material is used to fill the welding zones and weld them together.

[0004] In the existing technology, the outer side of the upset part of the steel strip is perpendicular to the surface of the steel strip, that is, the weld area is a parallel gap. Such steel pipes still have the disadvantages of weak welding, weak load-bearing capacity and poor durability. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings by providing a spiral steel pipe with strong load-bearing capacity and durability, featuring side upsetting.

[0006] The technical solution of this utility model is implemented as follows: a spiral steel pipe with side upsetting includes a steel pipe body, which is formed by spirally winding a steel strip. The steel strip has a side, and upsetting is performed on the side of the steel strip to form an upsetting part. The upsetting part has an outer surface, and the outer surfaces of adjacent steel strips are a welding area, which is filled with solder and welded together. The characteristic is that the welding area is an externally enlarged groove, and the welding connection is performed at the groove, that is, the groove is filled with flux.

[0007] Furthermore, the steel pipe body has an inner cavity and an inner surface, and the upsetting thickness portion does not exceed the inner surface at the inner cavity.

[0008] Furthermore, the steel pipe body has an outer surface and an outer side surface, and the upsetting thickness portion does not exceed the outer side surface at the outer surface.

[0009] Furthermore, the cross-section of the welding area is a triangular structure, a semi-circular structure, or a semi-elliptical structure.

[0010] Furthermore, the inner surface of the steel pipe body also has an inner cladding layer, and the inner surface of the inner cladding layer is flush with the joints of adjacent steel strips and other parts.

[0011] Furthermore, the outer surface of the steel pipe body also has an outer cladding layer, and the inner surface of the outer cladding layer is flush with the adjacent steel strip connections and other parts.

[0012] Furthermore, steel bars are placed in the welding area, and these steel bars are submerged in the solder.

[0013] The beneficial effects of this utility model are that such steel pipes have the advantages of strong load-bearing capacity and durability. Attached Figure Description

[0014] Figure 1 This is a side view of the structure of this utility model.

[0015] Figure 2 yes Figure 1 A schematic diagram of a structure in the A-A direction.

[0016] Figure 3 yes Figure 1 A schematic diagram of a structure in the A-A direction.

[0017] Figure 4 yes Figure 1 A schematic diagram of a structure in the A-A direction.

[0018] Among them: 1. Steel strip; 11. Upsetting part; 12. Outer side; 2. Welding area; 3. Inner cladding layer; 4. Outer cladding layer; 5. Steel strip. Detailed Implementation

[0019] The present invention will now be further described with reference to the accompanying drawings.

[0020] like Figure 1 , 2 As shown in Figures 3 and 4, a spiral steel pipe with side upsetting includes a steel pipe body, which is formed by spirally winding a steel strip 1. The steel strip has a side edge, and upsetting is performed on the side edge of the steel strip to form an upsetting portion 11. The upsetting portion has an outer surface 12, and a welding area 2 is formed between the outer surfaces of adjacent steel strips. The welding area is filled with solder and welded together. The characteristic is that the welding area is an externally enlarged groove, and the welding connection is performed at the groove.

[0021] Since the welding area of ​​this utility model is an externally enlarged groove, the welding material is more easily filled, which can reduce the phenomenon of empty welding and achieve the purpose of this utility model. This design of this utility model also has the advantage of reducing solder loss.

[0022] Furthermore, the steel pipe body has an inner cavity and an inner surface, and the upsetting thickness portion does not exceed the inner surface at the inner cavity.

[0023] like Figure 2 , 3 As shown, this design allows the inner surface of the formed steel pipe to be flat, meeting certain usage requirements, such as reducing water flow resistance.

[0024] Furthermore, the steel pipe body has an outer surface and an outer side surface, and the upsetting thickness portion does not exceed the outer side surface at the outer surface.

[0025] like Figure 4 As shown, this design allows the outer surface of the formed steel pipe to be flat, meeting certain installation requirements.

[0026] Furthermore, the cross-section of the welding area is a triangular structure, a semi-circular structure, or a semi-elliptical structure.

[0027] Furthermore, the inner surface of the steel pipe body also has an inner cladding layer 3, the inner surface of which is flush with the adjacent steel strip connection and other parts.

[0028] Furthermore, the outer surface of the steel pipe body also has an outer cladding layer 4, and the inner surface of the outer cladding layer is flush with the adjacent steel strip connection and other parts.

[0029] like Figure 2 , 3 As shown in Figures 4 and 5, the above-mentioned features of this utility model can meet some installation requirements.

[0030] Furthermore, steel bars 5 are placed in the welding area, and these steel bars are submerged in the solder.

[0031] This design also has the advantages of saving welding materials and providing a strong connection.

[0032] In one embodiment, the cross-section of the steel bar is similar to that of the welded area, that is, the cross-section of the steel bar is smaller than that of the welded area.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A spirally wound steel pipe with side upsetting, comprising a steel pipe body, the steel pipe body being formed by spirally winding steel strip, the steel strip having a side, wherein upsetting is performed on the side of the steel strip to form an upsetting portion, the upsetting portion having an outer surface, and a welding zone being formed between the outer surfaces of adjacent steel strips, the welding zone being filled with solder and welded together; characterized in that: The welding area is an outer enlarged groove, and the connection is welded at the groove; a steel bar is also placed inside the welding area, and the steel bar is submerged in the solder.

2. The spiral steel pipe with side upsetting as described in claim 1, characterized in that: The steel pipe body has an inner cavity and an inner side surface, and the upsetting thickness portion does not exceed the inner side surface at the inner cavity.

3. The spiral steel pipe with side upsetting as described in claim 1, characterized in that: The steel pipe body has an outer surface and an outer side surface, and the upsetting thickness portion does not exceed the outer side surface at the outer surface.

4. The spiral steel pipe with side upsetting as described in claim 1, 2 or 3, characterized in that: The cross-section of the welding area can be triangular, semi-circular, or semi-elliptical.

5. The spiral steel pipe with side upsetting as described in claim 1, 2 or 3, characterized in that: The inner surface of the steel pipe body also has an inner cladding layer, and the inner surface of the inner cladding layer is flush with the adjacent steel strip joints and other parts.

6. The spiral steel pipe with side upsetting as described in claim 1, 2 or 3, characterized in that: The outer surface of the steel pipe body also has an outer cladding layer, and the inner surface of the outer cladding layer is flush with the adjacent steel strip joints and other parts.

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