Composite ribbed thin-wall stainless steel recycled concrete column component with high bearing capacity

Abstract

The high-bearing-capacity composite ribbed thin-wall stainless steel recycled concrete column component comprises L-shaped steel plates, cold-bending stiffening ribs perpendicular to the L-shaped steel plates are arranged at the two free ends of each L-shaped steel plate, the two cold-bending stiffening ribs of the same L-shaped steel plate are perpendicular in space, the corresponding cold-bending stiffening ribs of the adjacent L-shaped steel plates are connected, and the corresponding cold-bending stiffening ribs of the L-shaped steel plates are connected with the corresponding cold-bending stiffening ribs of the L-shaped steel plates. The other end of the cold-bending stiffening rib is fixed to the outer wall of the circular steel pipe, and a second filling cavity is defined by the L-shaped steel plate and the circular steel pipe. The advantages of a traditional component are inherited, and due to strong constraint of the component, the wall thickness of the externally-wrapped stainless steel pipe can be properly reduced on the premise that the safety of the component is guaranteed, so that the purpose of reducing the cost is achieved. The concrete column is attractive in appearance, easy to construct, good in bearing capacity, local buckling prevention capacity and corrosion resistance and low in construction cost.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering, and in particular relates to a high-bearing-capacity composite ribbed thin-walled stainless steel recycled concrete column component. Background Art

[0002] In general civil engineering construction, concrete-filled steel tube (CFST) columns are used, simplifying construction by eliminating the need for rebar tying, formwork support, and formwork removal. The lack of steel reinforcement within the tubes facilitates pouring and compaction. In particular, the current use of construction techniques such as pumped concrete, high-drop, non-vibrated concrete, and vibration-free self-compacting concrete accelerates the construction of CFST components. Compared to precast reinforced concrete components, CFST structures do not require a prefabrication site. Compared to steel structures, CFST structures are generally simpler and have fewer welds. This is primarily due to the generally thinner steel tubes, particularly those that comprise CFST components, making on-site splicing and butt welding quick and easy. The low deadweight of empty steel tube components significantly reduces transportation and lifting costs. Furthermore, compared to conventional steel columns, whether single-tube or lattice columns, CFST column bases have fewer components and shorter welds, allowing them to be directly inserted into the reserved cup opening in the concrete foundation, eliminating the need for complex footing construction. In square steel tube concrete columns, in order to prevent local buckling of the steel tube, it is necessary to limit the width-to-thickness ratio of the steel tube. Under the condition of a certain steel tube width, in order to meet the width-to-thickness ratio requirements, the steel tube wall thickness needs to be increased, resulting in an increase in steel consumption. Ribbed square steel tubes can be used to reduce the amount of steel used while meeting the width-to-thickness ratio.

[0003] Composite ribbed thin-walled stainless steel recycled concrete columns evolved from previous carbon thin-walled steel tube concrete columns. By changing the external carbon steel to stainless steel, the steel tube concrete columns can obtain higher bearing capacity, deformation capacity, corrosion resistance, and fire resistance. At the same time, the wall thickness is reduced to achieve the purpose of reducing construction costs and facilitating welding. Square steel tubes are widely used in construction projects because they have more advantages than circular steel tubes in node connections.

[0004] In thin-walled square steel tube concrete-filled columns, insufficient restraint in the middle of the four sides results in a large unconstrained area in the middle of the tube, which fails to provide sufficient restraint for the core concrete. This causes the tube to yield prematurely under pressure. Furthermore, since concrete is the primary load-bearing component in thin-walled components, when the concrete strength is low, the core concrete is weak, making it more susceptible to crushing. When the component reaches a certain load, the tube yields prematurely. Then, due to the inherently weak strength of the core concrete and the inability of the outer steel tube to provide sufficient restraint, the tube is crushed. This leads to severe bulging in the middle of the tube, severely reducing the component's load-bearing capacity. This prevents the full potential of the concrete-filled steel tube column from being realized, potentially jeopardizing the safety of the building. Carbon steel tubes lack excellent corrosion resistance, requiring a coating of anti-rust paint when used in highly corrosive environments, which increases costs.

[0005] In view of the above-mentioned technical problems, it is very necessary to design a high-bearing-capacity thin-walled stainless steel tube concrete column component to solve the above-mentioned problems. Summary of the Invention

[0006] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a composite ribbed thin-walled stainless steel recycled concrete column component with high bearing capacity.

[0007] The technical solution of the present invention is: a high-bearing capacity composite ribbed thin-walled stainless steel recycled concrete column component, including an L-shaped steel plate, both free ends of the L-shaped steel plate are provided with cold-bent stiffening ribs perpendicular thereto, and the two cold-bent stiffening ribs of the same L-shaped steel plate are spaced perpendicularly, the corresponding cold-bent stiffening ribs of adjacent L-shaped steel plates are connected, the other end of the cold-bent stiffening rib is fixed to the outer wall of a circular steel tube, and a second filling cavity is enclosed between the L-shaped steel plate and the circular steel tube.

[0008] Furthermore, a second concrete filler is poured into the second filling cavity.

[0009] Furthermore, there are four L-shaped steel plates, and the outer contours of the four L-shaped steel plates are combined to form a combined square stainless steel tube.

[0010] Furthermore, the inner cavity of the circular steel pipe is a first filling cavity, and a first concrete filler is poured into the first filling cavity.

[0011] Furthermore, the cold-bent stiffening ribs, the combined outer-wrapped square stainless steel tube body, and the circular steel tube are all of the same height.

[0012] Furthermore, the extension line of the cold-bent stiffening rib passes through the center line of the square stainless steel tube body and the axis of the circular steel tube.

[0013] Furthermore, the thickness of the L-shaped steel plate is not less than 2 mm, and the thickness of the circular steel pipe is not less than 4 mm.

[0014] Furthermore, the second filling cavity is formed by the outer wall of the circular steel tube, the inner wall of the L-shaped steel plate, and the inner walls of two cold-bent stiffening ribs, and the second filling cavity is independent of the first filling cavity.

[0015] Furthermore, the L-shaped steel plate is made of A304 stainless steel.

[0016] Furthermore, the circular steel pipe is made of high-strength carbon steel, with a strength grade not lower than Q235 and a quality grade not lower than B.

[0017] The beneficial effects of the present invention are as follows: The present invention inherits the advantages of traditional components, and due to the strong constraints of the components, the wall thickness of the outer stainless steel pipe can be appropriately reduced while ensuring the safety of the components. The thickness and diameter of the round steel pipe can also be adjusted according to actual construction, thereby achieving the purpose of reducing costs.

[0018] The concrete column of the present invention is not only beautiful in appearance and simple to construct, but also has good bearing capacity, local buckling resistance and corrosion resistance, and has low construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a top view of the present invention; Figure 2 is a perspective view of the present invention; Figure 3 is a cross-sectional view of the present invention; Figure 4 Detailed schematic diagram of the cold-bent stiffener in the present invention; Figure 5 is a schematic diagram of an L-shaped steel plate in the present invention; in: 1Cold-bent stiffener 2Square stainless steel tube 3 round steel pipe 4 concrete filler 5L-shaped steel plate 41 First concrete filling 42 Second concrete filling DETAILED DESCRIPTION

[0020] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments: like Figures 1 to 5As shown, a high-bearing-capacity composite ribbed thin-walled stainless steel recycled concrete column component includes an L-shaped steel plate 5, and both free ends of the L-shaped steel plate 5 are provided with cold-bent stiffening ribs 1 perpendicular thereto, and the two cold-bent stiffening ribs 1 of the same L-shaped steel plate 5 are vertical in space, and the corresponding cold-bent stiffening ribs 1 of adjacent L-shaped steel plates 5 are connected, and the other end of the cold-bent stiffening rib 1 is fixed to the outer wall of the circular steel tube 3, and a second filling cavity is enclosed between the L-shaped steel plate 5 and the circular steel tube 3.

[0021] A second concrete filling 42 is poured into the second filling cavity.

[0022] There are four L-shaped steel plates 5 , and the outer contours of the four L-shaped steel plates 5 are combined to form a combined square stainless steel tube 2 .

[0023] The inner cavity of the circular steel tube 3 is a first filling cavity, in which a first concrete filler 41 is poured.

[0024] The cold-bent stiffening ribs 1, the assembled outer-wrapped square stainless steel tube body 2, and the circular steel tube 3 are all of the same height.

[0025] The extension line of the cold-bent stiffening rib 1 passes through the center line of the square stainless steel tube 2 and the axis of the circular steel tube 3.

[0026] The thickness of the L-shaped steel plate 5 is not less than 2 mm, and the thickness of the circular steel pipe 3 is not less than 4 mm.

[0027] The second filling cavity is formed by the outer wall of the circular steel tube 5, the inner wall of the L-shaped steel plate 5, and the inner walls of the two cold-bent stiffening ribs 1, and the second filling cavity is independent of the first filling cavity.

[0028] The L-shaped steel plate 5 is made of A304 stainless steel.

[0029] The circular steel tube 3 is made of high-strength carbon steel, with a strength grade not lower than Q235 and a quality grade not lower than B.

[0030] Specifically, the square stainless steel tube 2 is composed of four cold-bent L-shaped steel plates 5. The circular steel tube 3 is sleeved in the tube body of the square stainless steel tube 2 , and the circular steel tube 3 is welded to the square stainless steel tube 2 through the cold-bent stiffening rib 1 .

[0031] More specifically, the adjacent cold-bent stiffening ribs 1 between the L-shaped steel plates 5 are also fixed by welding.

[0032] Specifically, the concrete filler 4 includes a first concrete filler 41 and a second concrete filler 42. The circular steel tube 3 is filled with the first concrete filler 41. The first concrete filler 41 can be made of high-strength concrete, self-compacting concrete or expansive concrete, or ordinary concrete, and its strength grade is not less than C40; the space between the circular steel tube 3 and the square stainless steel tube 2 is filled with the second concrete filler 42. The second concrete filler 42 can also be made of high-strength concrete, self-compacting concrete or expansive concrete, or ordinary concrete, and its strength grade is not less than C40.

[0033] Specifically, the circular steel pipe 3 is a thin-walled steel pipe with a ratio of pipe length to pipe wall thickness of 125.

[0034] Specifically, high-strength concrete 4 is filled between the square stainless steel pipe 2 and the circular steel pipe 3 to ensure that the square stainless steel pipe 2 only yields outward. Since the cold-bent stiffening rib 1 is welded to the circular steel pipe 3, when the concrete in the circular steel pipe 3 yields outward, the middle part of the square stainless steel pipe 2 is subjected to a more uniform force due to the presence of the stiffening rib, making it less likely that the middle part of the component will yield, thereby further reducing the yield of the four sides of the square stainless steel pipe 2; since the high-strength concrete itself has relatively good compressive resistance, it is not easily crushed under greater pressure, thereby ensuring to a certain extent the ability of the various components in the steel pipe column to work together and increasing the bearing capacity of the stainless steel pipe column.

[0035] The preparation method of the present invention is as follows: Stainless steel plates and carbon steel are processed according to the design dimensions, and four stainless steel plates of equal thickness are formed by cold bending at right angles to obtain L-shaped steel plates 5. The ends of the L-shaped steel plates 5 are connected to the circular steel pipes 3 through cold-bent stiffening ribs 1 and are laser welded into a whole.

[0036] The concrete filler 4 includes a first concrete filler 41 and a second concrete filler 42. The first concrete filler 41 is filled in the circular steel tube 3, and the end face of the first concrete filler 41 is flush with the end face of the square stainless steel tube 2. The second concrete filler 42 is filled between the circular steel tube 3 and the square stainless steel tube 2, and the end face of the second concrete filler 42 is flush with the end faces of the square stainless steel tube 2 and the circular steel tube 3. The first concrete filler 41 and the second concrete filler 42 can be selected from ordinary concrete fillers, high-strength concrete fillers or self-compacting concrete fillers, and the strength grade is not less than C40.

[0037] Since the outer contour of the present invention is a square stainless steel tube 2, the whole has a beautiful structural appearance and excellent corrosion resistance, which can save the later anti-corrosion and anti-rust treatment process of the steel pipe column, and the structure of the square stainless steel tube 2 is square, which has the characteristics of strong bending resistance and easy node treatment; at the same time, a circular steel tube 3 is sleeved inside the square stainless steel tube 2, and the circular steel tube 3 is connected to the square stainless steel tube 2 through cold-bent stiffening ribs 1, so that the bearing capacity of the steel pipe concrete column is stronger. In this way, the steel pipe column can adopt stainless steel pipes with thinner wall thickness. Compared with traditional stainless steel pipe concrete columns, the engineering usage of stainless steel can be greatly saved, the production cost is lower, and the circular steel tube 3 has a better restraining effect on the concrete filler, so that the concrete filler can fully play its role, so that the crack resistance and shrinkage resistance of the concrete filler are not easily affected, so that the excellent performance of the concrete filler can be fully exerted, and the shear resistance of the stainless steel pipe concrete column can be greatly improved.

[0038] The present invention uses cold-bending technology to form cold-bent stiffening ribs 1 for the outer square stainless steel tube 2, and is connected to the inner circular steel tube 3 by welding, so that the entire component forms a whole, making it difficult for the middle part of the component to yield, and making the stress on the middle part of the outer square stainless steel tube 2 more uniform. Due to the presence of these two measures, the circular steel tube 3 and the cold-bent stiffening rib 1, the buckling height of the middle part of the four sides of the square stainless steel tube 2 can be reduced, delaying the occurrence of local yield and concrete crushing. Since high-strength concrete has good compressive bearing capacity and good bonding strength, when high-strength concrete is used as a concrete filler and filled into the stainless steel tube, it can not only further improve the bearing capacity of the component and delay the occurrence of concrete crushing, but also enhance the bonding strength between the steel tube and the concrete, thereby achieving the purpose of enhancing the joint stress.

[0039] Due to the above properties, the present invention can be used in compression components and in environments with corrosive media, such as super high-rise columns, bridge piers, etc.

[0040] The above is a typical embodiment of the present invention, and the implementation of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the aforementioned embodiment, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiment, or replace some of the technical features therein with equivalents; and such modifications or replacements do not deviate from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-bearing-capacity composite ribbed thin-walled stainless steel recycled concrete column member, characterized by: It comprises an L-shaped steel plate (5), wherein both free ends of the L-shaped steel plate (5) are provided with cold-bent stiffening ribs (1) perpendicular thereto, and the two cold-bent stiffening ribs (1) of the same L-shaped steel plate (5) are spaced perpendicularly, and the corresponding cold-bent stiffening ribs (1) of adjacent L-shaped steel plates (5) are connected, and the other end of the cold-bent stiffening rib (1) is fixed to the outer wall of the circular steel tube (3), and a second filling cavity is formed between the L-shaped steel plate (5) and the circular steel tube (3).

2. The high-bearing capacity composite ribbed thin-walled stainless steel recycled concrete column member according to claim 1, characterized in that: A second concrete filling (42) is poured into the second filling cavity.

3. The high-bearing capacity composite ribbed thin-walled stainless steel recycled concrete column member according to claim 1, characterized in that: There are four L-shaped steel plates (5), and the outer contours of the four L-shaped steel plates (5) are combined to form a combined square stainless steel tube (2).

4. The high-bearing capacity composite ribbed thin-walled stainless steel recycled concrete column member according to claim 1, characterized in that: The inner cavity of the circular steel tube (3) is a first filling cavity, and a first concrete filler (41) is poured into the first filling cavity.

5. The high-bearing capacity composite ribbed thin-walled stainless steel recycled concrete column member according to claim 3, characterized in that: The cold-bent stiffening ribs (1), the assembled outer-wrapped square stainless steel tube body (2), and the circular steel tube (3) are all of the same height.

6. The high-bearing capacity composite ribbed thin-walled stainless steel recycled concrete column member according to claim 3, characterized in that: The extension line of the cold-bent stiffening rib (1) passes through the center line of the square stainless steel tube body (2) and the axis of the circular steel tube (3).

7. The high-bearing capacity composite ribbed thin-walled stainless steel recycled concrete column member according to claim 1, characterized in that: The thickness of the L-shaped steel plate (5) is not less than 2 mm, and the thickness of the circular steel tube (3) is not less than 4 mm.

8. The high-bearing capacity composite ribbed thin-walled stainless steel recycled concrete column member according to claim 4, characterized in that: The second filling cavity is formed by enclosing the outer wall of the circular steel tube (3), the inner wall of the L-shaped steel plate (5), and the inner walls of the two cold-bent stiffening ribs (1), and the second filling cavity is independent of the first filling cavity.

9. The high-bearing capacity composite ribbed thin-walled stainless steel recycled concrete column member according to claim 1, characterized in that: The L-shaped steel plate (5) is made of A304 stainless steel.

10. The high-bearing capacity composite ribbed thin-walled stainless steel recycled concrete column member according to claim 1, characterized in that: The circular steel tube (3) is made of high-strength carbon steel, with a strength grade not lower than Q235 and a quality grade not lower than Grade B.

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