Method for manufacturing round longitudinally corrugated steel pipe

Abstract

A method for manufacturing a round longitudinally corrugated steel pipe, comprising: pressing a seamless round steel pipe by means of an integrated inner-outer interleaved cold bending roll forming machine, allowing longitudinal corrugations to be formed on the seamless round steel pipe, thereby forming a round longitudinally corrugated steel pipe (3), wherein the longitudinal corrugations are parallel to the axial direction of the seamless round steel pipe, and the diameter the seamless round steel pipe is larger than that of the round longitudinally corrugated steel pipe (3).

Description

A method for manufacturing a circular vertical corrugated steel pipe Technical Field

[0001] This invention relates to the field of building construction and steel pipe design and processing technology, and in particular to a method for manufacturing a circular vertical corrugated steel pipe. Background Technology

[0002] Currently, circular steel pipes are used in various bridge structures and temporary supports due to their simple and reasonable structure and convenient processing, thus they have been widely used in various construction scenarios. However, circular steel pipes are generally unstiffened, and although their buckling resistance is relatively high, it is still limited, and there has been no better way to improve it. Furthermore, even when circular steel pipes are stiffened, it is usually done by welding stiffening plates extending axially along the outside of the circular steel pipe, which relatively increases the cross-sectional dimensions of the combined component, making design and construction difficult. Summary of the Invention

[0003] The purpose of this invention is to provide a method for manufacturing a circular vertical corrugated steel pipe, addressing the shortcomings of the prior art.

[0004] The objective of this invention is achieved through the following technical solutions:

[0005] A method for manufacturing a circular vertically corrugated steel pipe, characterized in that: a seamless circular steel pipe is pressed by an integrated cold bending roll press with alternating inner and outer sections, so that the seamless circular steel pipe forms vertical corrugations, thereby forming a circular vertically corrugated steel pipe, wherein the vertical corrugations are parallel to the axial direction of the seamless circular steel pipe, and the diameter of the seamless circular steel pipe is larger than the diameter of the circular vertically corrugated steel pipe.

[0006] The integrated cold bending roll press applies radially staggered extrusion forces to the seamless circular steel pipe from both the inner and outer sides, causing the seamless circular steel pipe to form the vertical corrugations.

[0007] The integrated cold bending roll press includes an inner machine and an outer machine, the diameters of which are variable.

[0008] When the circular vertical corrugated steel pipe needs to be perforated, the external machine extends a punching blade to cut and form the perforation.

[0009] The inner machine and the outer machine are each composed of several irregularly shaped pressure rollers arranged circumferentially. The irregularly shaped pressure rollers of the inner machine have protrusions that bulge from the inside to the outside of the seamless circular steel pipe, and the irregularly shaped pressure rollers of the outer machine have protrusions that bulge from the outside to the inside of the seamless circular steel pipe. The protrusions of the inner machine and the protrusions of the outer machine match each other and simultaneously extrude the seamless circular steel pipe.

[0010] The inner machine's several irregularly shaped pressure rollers and the outer machine's several irregularly shaped pressure rollers are arranged in a staggered pattern.

[0011] The vertical corrugations are arc-shaped or trapezoidal.

[0012] The advantages of this invention are:

[0013] It fills the gap in the production of circular vertical corrugated steel pipes;

[0014] 2) Circular vertical corrugated steel pipes can be used in column members that bear large axial and horizontal forces, and can be combined with concrete inside and outside to form composite steel pipes;

[0015] 3) When concrete is poured on both the inner and outer sides of the circular vertical corrugated steel pipe, the problem of severe corrosion of steel pipe under marine climate conditions can be solved, steel is saved, the competitive advantage is obvious, and the application prospects are broad.

[0016] 4) Cold bending seamless circular steel pipes into circular vertical corrugated steel pipes requires the development of corresponding equipment, which improves the level of equipment manufacturing. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the structure of the present invention;

[0018] Figure 2 is a schematic diagram of the internal unit in this invention;

[0019] Figure 3 is a schematic diagram of the structure of the external unit in this invention. Detailed Implementation

[0020] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art:

[0021] As shown in Figure 1-3, the markings 1-3 in the figure represent: 1. Inner machine special-shaped pressure roller, 2. Outer machine special-shaped pressure roller, and 3. Circular vertical corrugated steel pipe.

[0022] Example: As shown in Figures 1 to 3, the method for manufacturing a circular vertical corrugated steel pipe in this example is used to process a seamless circular steel pipe into a circular vertical corrugated steel pipe 3.

[0023] As shown in Figure 1, in this embodiment, seamless circular steel pipes are formed by pressing them using an integrated cold bending roll press with alternating inner and outer sections. Each segment is 8-12m long. The vertical corrugations formed on the circular vertical corrugated steel pipe 3 can be arc-shaped or trapezoidal as shown in Figure 1, and the vertical corrugations are parallel to the axial direction of the steel pipe.

[0024] The diameter of the circular steel pipe is larger than that of the circular vertical corrugated steel pipe 3. Therefore, the inner and outer diameters of the integrated cold bending roll press can be varied as the steel pipe is cold-bent under radially interlaced extrusion pressure.

[0025] Specifically, as shown in Figures 1 to 3, the inner and outer machines are each composed of several irregularly shaped pressure rollers arranged circumferentially, including an inner machine irregularly shaped pressure roller 1 and an outer machine irregularly shaped pressure roller 2. The inner machine irregularly shaped pressure roller 1 has protrusions that bulge from the inside to the outside of the seamless circular steel pipe, while the outer machine irregularly shaped pressure roller 2 has protrusions that bulge from the outside to the inside of the seamless circular steel pipe. The protrusions of the inner machine irregularly shaped pressure roller 1 and the outer machine irregularly shaped pressure roller 2 match and simultaneously press the seamless circular steel pipe from both the inside and outside sides, thereby forming a circular vertically corrugated steel pipe 3 with vertical corrugations.

[0026] In this embodiment, a number of inner machine irregular-shaped pressure rollers 1 and a number of outer machine irregular-shaped pressure rollers 2 are arranged in a staggered manner, so that when the seamless round steel pipe is subjected to radially intersecting extrusion force, it is relatively uniform along the circumference of the seamless round steel pipe, thereby forming a uniform array of vertical corrugations, avoiding the steel pipe from being damaged due to uneven extrusion force when pressing the seamless round steel pipe, especially the thin-walled steel pipe.

[0027] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A method for manufacturing a circular vertically corrugated steel pipe, characterized in that: Seamless circular steel pipes are pressed using an integrated cold bending roll press with alternating inner and outer sections, forming vertical corrugations to create a circular vertical corrugated steel pipe. The vertical corrugations are parallel to the axial direction of the seamless circular steel pipe, and the diameter of the seamless circular steel pipe is larger than the diameter of the circular vertical corrugated steel pipe.

2. The method for manufacturing a circular vertical corrugated steel pipe according to claim 1, characterized in that: The integrated cold bending roll press applies radially staggered extrusion forces to the seamless circular steel pipe from both the inner and outer sides, causing the seamless circular steel pipe to form the vertical corrugations.

3. The method for manufacturing a circular vertical corrugated steel pipe according to claim 1, characterized in that: The integrated cold bending roll press includes an inner machine and an outer machine, the diameters of which are variable.

4. The method for manufacturing a circular vertical corrugated steel pipe according to claim 3, characterized in that: When the circular vertical corrugated steel pipe needs to be perforated, the external machine extends a punching blade to cut and form the perforation.

5. The method for manufacturing a circular vertical corrugated steel pipe according to claim 3, characterized in that: The inner machine and the outer machine are each composed of several irregularly shaped pressure rollers arranged circumferentially. The irregularly shaped pressure rollers of the inner machine have protrusions that bulge from the inside to the outside of the seamless circular steel pipe, and the irregularly shaped pressure rollers of the outer machine have protrusions that bulge from the outside to the inside of the seamless circular steel pipe. The protrusions of the inner machine and the protrusions of the outer machine match each other and simultaneously extrude the seamless circular steel pipe.

6. The method for manufacturing a circular vertical corrugated steel pipe according to claim 5, characterized in that: The inner machine's several irregularly shaped pressure rollers and the outer machine's several irregularly shaped pressure rollers are arranged in a staggered pattern.

7. The method for manufacturing a circular vertical corrugated steel pipe according to claim 1, characterized in that: The vertical corrugations are arc-shaped or trapezoidal.

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