Manufacturing method of circular vertical corrugated steel pipe

Abstract

The invention relates to the technical field of building construction and steel pipe design and processing, in particular to a manufacturing method of a circular vertical corrugated steel pipe, which comprises the following steps of: pressing a seamless circular steel pipe through an integrated cold-bending roller press which is internally and externally staggered to form vertical corrugations on the seamless circular steel pipe, thereby forming the 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 that of the circular vertical corrugated steel pipe. The method has the advantages of overcoming the defects of limited bearing capacity, poor corrosion resistance and the like of a circular steel pipe, and being simple in construction, low in manufacturing cost and good in performance.

Description

Technical Field

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

[0002] At present, circular steel pipes are used in various bridge structures and temporary supports. They have a simple and reasonable structure and are easy to process, so they have been widely used in various construction scenarios. However, circular steel pipes are generally not reinforced. Although the anti-buckling bearing capacity is relatively high, it is prioritized and there has been no better way to improve it. In addition, even if the circular steel pipe is reinforced, a stiffening plate extending along the axial direction of the circular steel pipe is generally welded to the outside of the circular steel pipe. However, the cross-sectional size of the combined component formed by the two is relatively increased, which is not conducive to design and construction. Summary of the invention

[0003] The purpose of the present invention is to provide a method for manufacturing a circular vertical corrugated steel pipe based on the above-mentioned deficiencies in the prior art.

[0004] The purpose of the present invention is achieved by the following technical solutions: A method for manufacturing a circular vertical corrugated steel pipe, characterized in that: a seamless circular steel pipe is pressed through an integrated cold bending roller press that is staggered inside and outside to form vertical corrugations on the seamless circular steel pipe, thereby forming a circular vertical 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 vertical corrugated steel pipe.

[0005] The integrated cold bending roller press applies radially staggered extrusion pressure to the seamless circular steel pipe from the inner and outer sides thereof, so that the seamless circular steel pipe forms the vertical corrugations.

[0006] The integrated cold bending roller press comprises an inner machine and an outer machine, and the diameters of the inner machine and the outer machine are variable.

[0007] When a hole needs to be drilled in the circular vertical corrugated steel pipe, the external machine extends a punching knife to cut and form the hole.

[0008] The inner machine and the outer machine are respectively composed of a plurality of special-shaped pressing rollers combined along the circumferential direction. The special-shaped pressing roller of the inner machine has a bulge protruding from the inside to the outside of the seamless circular steel pipe, and the special-shaped pressing roller of the outer machine has a bulge protruding from the outside to the inside of the seamless circular steel pipe. The bulge of the inner machine matches the bulge of the outer machine and extrude the seamless circular steel pipe at the same time.

[0009] The plurality of special-shaped pressing rollers of the inner machine and the plurality of special-shaped pressing rollers of the outer machine form a staggered arrangement.

[0010] The vertical corrugations are arc-shaped or trapezoidal.

[0011] The advantages of the present invention are: Fills the gap of circular vertical corrugated steel pipe; 2) Circular vertical corrugated steel pipes can be used in columnar components that bear large axial and horizontal forces, and can be laminated with concrete inside and outside to form a composite steel pipe; 3) When concrete is poured on both sides of the circular vertical corrugated steel pipe, the problem of serious corrosion of the steel pipe under marine climate conditions can be solved, which saves steel, has obvious competitive advantages and broad application prospects; 4) Cold bending and pressing seamless circular steel pipes into circular vertical corrugated steel pipes requires the development of corresponding equipment, which improves the level of equipment manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the indoor unit in the present invention; Figure 3 It is a structural schematic diagram of the external machine in the present invention. DETAILED DESCRIPTION

[0013] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art: like Figure 1-3 As shown, the marks 1-3 in the figure respectively represent: the inner machine special-shaped pressing roller 1, the outer machine special-shaped pressing roller 2, and the circular vertical corrugated steel pipe 3.

[0014] Example: Figures 1 to 3 As shown, the method for manufacturing a circular vertical corrugated steel pipe in this embodiment is used to process a seamless circular steel pipe into a circular vertical corrugated steel pipe 3.

[0015] like Figure 1 As shown, in this embodiment, the seamless round steel pipe is pressed by an integrated cold bending roller press with internal and external staggered, and each segment is 8-12m long. The vertical corrugations formed on the round vertical corrugated steel pipe 3 can be arc-shaped or can be Figure 1 As shown in the trapezoidal shape, the vertical corrugation is parallel to the axial direction of the steel pipe.

[0016] The diameter of the circular steel pipe is larger than the diameter of the circular vertical corrugated steel pipe 3, so the inner and outer diameters of the integrated cold bending roller press can be changed, and the steel pipe is cold bent by the radially staggered extrusion force.

[0017] Specifically, combined Figures 1 to 3As shown, the inner machine and the outer machine are respectively composed of a plurality of special-shaped rollers combined along the circumferential direction, including the inner machine special-shaped roller 1 of the inner machine and the outer machine special-shaped roller 2, wherein the inner machine special-shaped roller 1 has a convex block protruding from the inner to the outer direction of the seamless round steel pipe, and the outer machine special-shaped roller 2 has a convex block protruding from the outer to the inner direction of the seamless round steel pipe. The convex block of the inner machine special-shaped roller 1 matches the convex block of the outer machine special-shaped roller 2, and the seamless round steel pipe is squeezed from the inner and outer sides at the same time, thereby forming a circular vertical corrugated steel pipe 3 with vertical corrugations.

[0018] In this embodiment, a plurality of inner machine special-shaped pressing rollers 1 and a plurality of outer machine special-shaped pressing rollers 2 are staggeredly arranged so that the seamless circular steel tube is relatively uniform along the circumference of the seamless circular steel tube when subjected to radially staggered extrusion pressure, thereby forming a uniform array of vertical corrugations, thereby avoiding damage to the seamless circular steel tube due to uneven extrusion pressure when pressing the seamless circular steel tube, especially the thin-walled steel tube.

[0019] Although the above embodiments have described in detail the concepts and embodiments of the present invention with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and changes can still be made to the present invention without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A method for manufacturing a circular vertical corrugated steel pipe, characterized in that: The seamless circular steel pipe is pressed by an integrated cold bending roller press that is staggered inside and outside to form vertical corrugations on the seamless circular steel pipe, thereby forming 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 roller press applies radially staggered extrusion pressure to the seamless circular steel pipe from the inner and outer sides thereof, so that the seamless circular steel pipe forms 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 roller press comprises an inner machine and an outer machine, and the diameters of the inner machine and the outer machine are variable.

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

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 respectively composed of a plurality of special-shaped pressing rollers combined along the circumferential direction. The special-shaped pressing roller of the inner machine has a bulge protruding from the inside to the outside of the seamless circular steel pipe, and the special-shaped pressing roller of the outer machine has a bulge protruding from the outside to the inside of the seamless circular steel pipe. The bulge of the inner machine matches the bulge of the outer machine and extrude the seamless circular steel pipe at the same time.

6. The method for manufacturing a circular vertical corrugated steel pipe according to claim 5, characterized in that: The plurality of special-shaped pressing rollers of the inner machine and the plurality of special-shaped pressing rollers of the outer machine form a staggered arrangement.

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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