Cold roll forming square steel tube reinforced concrete split column
By using cold-formed square steel tube assemblies and steel cage structures, the problems of reduced stiffness and difficulty in post-earthquake repair of split columns have been solved, resulting in split columns with high stiffness and seismic resistance, and the ability to be quickly repaired after an earthquake.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-03-10
AI Technical Summary
The partition plates of existing split columns reduce the initial stiffness of the components after separating their parts, affecting the performance of the structure during normal use. Furthermore, the partition plates are located inside the components, making them difficult to repair after an earthquake.
The structure employs a combination of cold-formed square steel pipes and a reinforcing cage, connecting two hollow steel pipe units with soft steel strips and installing spiral stirrups inside the reinforcing cage. Combined with a concrete core, it forms a split column, enhancing rigidity and seismic resistance. It can also be repaired by replacement and welding after an earthquake.
It improves the stiffness and seismic resistance of the split column during normal use, enhances the energy dissipation capacity of the component, and makes post-earthquake repair simple and easy.
Smart Images
Figure CN223984181U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building profile technology, specifically to a cold-formed square steel tube reinforced concrete split column. Background Technology
[0002] In building structural design, due to the limitations of floor height or headroom, there may be short columns in the building structure with a ratio of column headroom to column cross-sectional dimensions of less than 3. Short columns are usually damaged by brittle failure and have poor load-bearing performance. In order to improve the load-bearing performance of such short columns, the concept of split columns has been proposed, which is to divide the original supporting column into several smaller columns along the vertical. The existing solution is generally to use a partition plate to separate the original supporting column in the middle.
[0003] The existing solution achieves the technical goal of split columns, but the partition plates reduce the initial stiffness of the components after separating the different parts of the short columns, affecting the performance during normal service life. Furthermore, because the partition plates are inside the components, the existing split column design for guide columns is difficult to repair after an earthquake. Therefore, the existing technology needs further improvement and enhancement. Utility Model Content
[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a cold-formed square steel tube reinforced concrete split column, which solves the problems that the partition plates of the existing split columns reduce the initial stiffness of the components and affect the performance of the structure during normal use, and that the partition plates are inside the components, making it difficult to repair damage after an earthquake.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0006] A cold-formed square steel tube reinforced concrete split column includes a square steel tube assembly and a steel cage. The square steel tube assembly includes two vertically arranged hollow steel tube units, which are symmetrically arranged adjacent to each other on the left and right sides and connected to each other by a set of soft steel strips on the front and back sides.
[0007] The central filling cavity is located in the middle of the square steel tube assembly. There are two symmetrically arranged side filling cavities on the left and right sides of the central filling cavity. The central filling cavity is located between two hollow steel tube units, and the side filling cavities are located in the internal cavities of the corresponding hollow steel tube units.
[0008] Five steel reinforcement cages are provided, all arranged vertically. One of the steel reinforcement cages is located inside the central filling cavity, and the remaining steel reinforcement cages are regularly arranged around the central filling cavity.
[0009] The concrete poured inside the central filling cavity solidifies to form a concrete central core, and the concrete poured inside the side filling cavity solidifies to form a concrete side core.
[0010] Each set of soft steel strips consists of multiple soft steel strips arranged at equal intervals from top to bottom, with each end of the soft steel strip being bolted to two hollow steel pipe units.
[0011] Furthermore, the middle of the adjacent sides of the two hollow steel pipe units are both inwardly concave semi-circular curved surfaces, and the combination of the semi-circular curved surfaces of the adjacent sides of the two hollow steel pipe units forms the central filling cavity.
[0012] Furthermore, the hollow steel pipe unit is a hollow tube formed by bending and welding a rectangular metal plate. Both sides of the rectangular metal plate along its length are bent into folded edges on the same side. The two folded edges of the bent rectangular metal plate are attached and joined together, and fixed together by riveting and welding at the joint of the two folded edges.
[0013] Furthermore, the weld at the interface of the hollow steel pipe unit is located in the middle of the two hollow steel pipe units on opposite sides. The weld is composed of multiple weld segments distributed at equal intervals, and the height of each weld segment relative to the side wall of the hollow steel pipe unit is 1mm.
[0014] Furthermore, the mild steel strip is a dumbbell-shaped metal plate that is narrow in the middle and wide at both ends. Each end of the mild steel strip is equipped with a bolt assembly, and the front and rear side walls of the two hollow steel pipe units are provided with elongated holes corresponding to the positions of the bolt assemblies.
[0015] The soft steel strip is attached to the front or rear side wall of the square steel tube assembly, and its left and right ends are respectively fixedly connected to the two hollow steel tube units by bolt assemblies.
[0016] Furthermore, the reinforcing cage adopts a spiral stirrup reinforcing cage, with two reinforcing cages arranged on the inner side of each hollow steel pipe unit. The two reinforcing cages located in the same hollow steel pipe unit are distributed one in front of the other at an interval.
[0017] By adopting the above technical solution, the beneficial technical effects of this utility model are as follows: The split column connected by the soft steel strip increases the stiffness of the column and improves the performance of the structure during normal use. Under strong earthquakes, the soft steel strip will undergo frictional energy dissipation, yielding, and fracture. In addition, the weld will also break during strong earthquakes. Both processes can increase the energy dissipation capacity of the component, and then a split column is formed. After the earthquake, these soft steel strips and welds can be repaired by replacement or welding. The repair process is simple and easy to implement. The five spiral stirrup steel cages evenly distributed inside the split column improve the collapse resistance of the split column under strong earthquakes. Attached Figure Description
[0018] Figure 1 This is a structural schematic diagram of a cold-formed square steel tube reinforced concrete split column according to this utility model.
[0019] Figure 2This is a structural schematic diagram of the soft steel strip of this utility model.
[0020] Figure 3 yes Figure 1 A schematic diagram showing the removal of the central concrete core and side concrete cores.
[0021] Figure 4 yes Figure 3 A magnified view of part A in the middle.
[0022] Figure 5 This is an unfolded diagram of the hollow steel pipe unit of this utility model.
[0023] Figure 6 This is a diagram illustrating the bending process of the hollow steel pipe unit of this utility model. Detailed Implementation
[0024] The present invention will now be described in detail with reference to the accompanying drawings:
[0025] Combination Figures 1 to 6 A cold-formed square steel tube reinforced concrete split column includes a square steel tube assembly 1 and a steel cage 2. The square steel tube assembly 1 includes two vertically arranged hollow steel tube units 11, which are symmetrically arranged adjacent to each other on the left and right.
[0026] The hollow steel pipe unit 11 is a hollow tube formed by bending and welding a rectangular metal plate. Both sides of the rectangular metal plate along its length are bent into folded edges 111. The two folded edges 111 of the bent rectangular metal plate are attached and joined together, and the two folded edges 111 are fixedly connected by riveting at the joint.
[0027] The weld 112 at the interface of the hollow steel pipe unit 11 is located in the middle of the two hollow steel pipe units 11 on opposite sides. The weld 112 is composed of multiple weld segments 112 distributed at equal intervals, and the height of each weld segment 112 relative to the side wall of the hollow steel pipe unit 11 is 1 mm. In the event of...
[0028] The central filling cavity 101 is located in the middle of the square steel tube assembly 1. There are two symmetrically arranged side filling cavities 102 on the left and right sides of the central filling cavity 101. The central filling cavity 101 is located between two hollow steel tube units 11, and the side filling cavities 102 are located in the internal cavity of the corresponding hollow steel tube unit 11.
[0029] The middle of the adjacent sides of the two hollow steel pipe units 11 are both inwardly concave semi-circular curved surfaces 113, and the semi-circular curved surfaces 113 on the adjacent sides of the two hollow steel pipe units 11 combine to form the central filling cavity 101.
[0030] The front and rear sides of the two hollow steel pipe units are connected into one unit by a set of soft steel strips 3. Each set of soft steel strips 3 includes multiple soft steel strips 3 arranged at equal intervals from top to bottom. The two ends of the soft steel strips 3 are respectively fixedly connected to the two hollow steel pipe units 11 by bolts.
[0031] Specifically, the soft steel strip 3 is a dumbbell-shaped metal plate, narrow in the middle and wide at both ends. A bolt assembly 31 is installed at each end of the soft steel strip 3. Elongated holes 114 corresponding to the positions of the bolt assemblies 31 are opened on the front and rear side walls of the two hollow steel pipe units 11. The soft steel strip 3 is attached to the front or rear side wall of the square steel pipe assembly 1, and its left and right ends are fixedly connected to the two hollow steel pipe units 11 via bolt assemblies 31. The soft steel strip 3 connects the two hollow steel pipe units 11, allowing the split columns formed after concrete pouring to be combined into a whole, ensuring the overall rigidity of the split columns and improving their performance under normal use.
[0032] During a strong earthquake, the split column will experience frictional energy dissipation and yielding due to shaking, causing the soft steel strip 3 to break at the middle position. In addition, the side wall welds of the hollow steel pipe unit 11 will also break during a strong earthquake. Both processes can increase the energy dissipation capacity of the components. After the earthquake, all soft steel strips are repaired by replacement, and the side wall welds of the hollow steel pipe unit 11 are repaired by welding. The repair process is simple and easy to implement.
[0033] The bolt assembly 31 includes a hexagonal head bolt and a nut. The nut is located inside the hollow steel pipe unit 11. The hexagonal head bolt passes through the corresponding elongated hole 114. The nut is tightened at the end of the hexagonal head bolt, thus fixing the soft steel strip 3 to the side wall of the hollow steel pipe unit 11.
[0034] Five steel reinforcement cages 2 are provided, all arranged vertically. One steel reinforcement cage 2 is located inside the central filling cavity 101, and the remaining steel reinforcement cages 2 are regularly arranged around the central filling cavity 101. Specifically, the steel reinforcement cages 2 are spiral stirrup steel reinforcement cages 2, with two steel reinforcement cages 2 arranged inside each hollow steel pipe unit 11, and the two steel reinforcement cages 2 located in the same hollow steel pipe unit 11 are distributed one in front of the other at an interval. The five spiral stirrup steel reinforcement cages embedded inside the split column ensure the split column's resistance to collapse under strong earthquakes.
[0035] The central filling cavity 101 is filled with self-compacting concrete, which solidifies to form a concrete central core 41. The side filling cavity 102 is filled with self-compacting concrete, which solidifies to form a concrete side core 42. After the self-compacting concrete in the side filling cavity 102 solidifies, nuts are fixedly embedded in the inner wall of the concrete side core 42. To replace the damaged soft steel strip 3, the hexagonal head bolt is rotated in the opposite direction to remove the damaged soft steel strip 3 and a new soft steel strip 3 is installed.
[0036] The cold-formed square steel tube reinforced concrete split column of this utility model can meet the support strength under normal conditions, improve its seismic resistance through the energy dissipation of the components during an earthquake, and can be quickly and easily repaired after the earthquake.
[0037] The parts not mentioned in this utility model can be achieved by adopting or referencing existing technologies.
[0038] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0040] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.
Claims
1. A cold-formed square tubular steel reinforced concrete split column, characterized by, The square steel pipe assembly comprises two hollow steel pipe units arranged vertically and symmetrically arranged side by side, and the two sides are connected integrally by a group of soft steel bands. The middle position of the square steel pipe assembly is a center filling cavity, and the left and right sides of the center filling cavity are two symmetrically arranged side filling cavities. The steel reinforcement cage is provided with five steel reinforcement cages arranged vertically, one of which is arranged in the center filling cavity, and the remaining steel reinforcement cages are regularly arranged on the periphery of the center filling cavity. The inside of the center filling cavity is poured with concrete and solidified to form a concrete center core, and the inside of the side filling cavity is poured with concrete and solidified to form a concrete side core. Each group of soft steel bands comprises a plurality of soft steel bands arranged at equal intervals from top to bottom, and the two ends of the soft steel bands are bolted and connected to the two hollow steel pipe units.
2. The cold-formed square tubular steel reinforced concrete split column according to claim 1, characterized in that, The adjacent middle parts of the two hollow steel pipe units are semicircular curved surfaces formed by inwardly recessing, and the semicircular curved surfaces of the adjacent sides of the two hollow steel pipe units combine to form the center filling cavity.
3. The cold-formed square tubular steel reinforced concrete split column according to claim 1, characterized in that, The hollow steel pipe unit is a hollow pipe body formed by bending and welding a rectangular metal plate, and the two sides of the rectangular metal plate along the length direction are both bent to form a folded edge part, and the two folded edge parts of the bent rectangular metal plate are abutted and butt jointed, and the butt joint is fixed and connected by riveting.
4. The cold-formed square tubular steel reinforced concrete split column according to claim 3, characterized in that, The weld at the interface of the hollow steel pipe unit is located in the middle of the side of the two hollow steel pipe units away from each other, and the weld is composed of a plurality of welds arranged at equal intervals, and the height of each weld relative to the side wall of the hollow steel pipe unit is 1mm.
5. The cold-formed square tubular steel reinforced concrete split column according to claim 1, characterized in that, The soft steel band is a dumbbell-shaped metal plate with a narrow middle and wide ends, and each end of the soft steel band is provided with a bolt assembly, and the front and rear side walls of the two hollow steel pipe units are provided with long circular holes corresponding to the positions of the bolt assemblies. The soft steel band is abutted on the front or rear side wall of the square steel pipe assembly, and the left and right ends are fixed and connected to the two hollow steel pipe units by the bolt assemblies.
6. The cold-formed square tubular steel reinforced concrete split column according to claim 1, wherein The steel reinforcement cage is a spiral hoop steel reinforcement cage, and two steel reinforcement cages are arranged on the inner side of each hollow steel pipe unit, and the two steel reinforcement cages in the same hollow steel pipe unit are arranged at equal intervals.