Variable cross-section frame column and steel reinforcement framework thereof

Abstract

The utility model provides a variable cross-section frame column and a steel reinforcement framework thereof, the variable cross-section frame column steel reinforcement framework comprises main reinforcements and spiral stirrups, the main reinforcements correspond to an upper column body and a lower column body of the frame column, a variable cross-section transition section comprises first main reinforcements, second main reinforcements and third main reinforcements, the third main reinforcements are obliquely connected between the first main reinforcements and the second main reinforcements, and the spiral stirrups are arranged between the first main reinforcements and the second main reinforcements. The spiral stirrup is spirally wound on the periphery of the main reinforcement in the extending direction of the main reinforcement, the diameter of the spiral stirrup located on the second main reinforcement is larger than that of the spiral stirrup located on the first main reinforcement, and the diameter of the spiral stirrup located on the third main reinforcement is gradually reduced in the direction from the second main reinforcement to the first main reinforcement. The steel reinforcement framework has good structural integrity, the spiral stirrups 1 can play a hooping effect on concrete in a core area of the variable-cross-section frame column, and the bearing capacity and the anti-seismic property of the variable-cross-section frame column are effectively improved.

Description

Technical Field

[0001] This application relates to the field of frame column technology, and in particular to a variable cross-section frame column and its steel reinforcement cage. Background Technology

[0002] Variable cross-section frame columns are an important part of building structural design. Their main feature is that the upper and lower sections of the column are different in size, usually with the upper section being smaller than the lower section. This design can meet different engineering needs and achieve the purpose of structural design optimization.

[0003] Currently, the internal reinforcement of frame columns includes main bars and stirrups. Stirrups are typically single-piece, separate stirrups, tied to the main bars to form the steel reinforcement skeleton of the frame column. However, the traditional single-piece, separate stirrups provide weak constraint on the concrete in the core area of ​​the frame column, and the overall integrity of the steel reinforcement skeleton is poor. Furthermore, the fabrication of single-piece, separate stirrups requires first cutting the steel bars to the appropriate length, then bending them into single-piece, separate stirrups, and finally tying them to the longitudinal reinforcement to form the steel reinforcement skeleton. This construction process is complex, involving a large amount of work in cutting, bending, and tying the steel bars. The tied ends also require additional hooks and laps, increasing the cost of steel. Utility Model Content

[0004] The purpose of this application is to provide a variable cross-section frame column and its steel reinforcement cage, which significantly improves the structural strength and integrity of the steel reinforcement cage of the variable cross-section frame column by using spiral stirrups, is easy to construct, and greatly improves the load-bearing capacity and seismic performance of the variable cross-section frame column.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] As a first aspect, this application relates to a steel reinforcement cage for a variable cross-section frame column, which includes main reinforcement bars and spiral stirrups. The main reinforcement bars correspond to the upper column, lower column, and variable cross-section transition section of the frame column, including a first main reinforcement bar, a second main reinforcement bar, and a third main reinforcement bar. The third main reinforcement bar is obliquely connected between the first and second main reinforcement bars. The spiral stirrups are spirally wound around the outer periphery of the main reinforcement bars along the extension direction of the main reinforcement bars. The diameter of the spiral stirrups at the second main reinforcement bar is larger than its diameter at the first main reinforcement bar. The diameter of the spiral stirrups at the third main reinforcement bar gradually decreases from the second main reinforcement bar towards the first main reinforcement bar.

[0007] Further details: The spiral stirrups are made by winding a single steel bar.

[0008] Further configuration: The spiral stirrup includes multiple steel bars, and the ends of the multiple steel bars are connected to form a single steel bar to form a spiral structure by winding around the outer periphery of the main bar.

[0009] Further configuration: The pitch of the spiral stirrup is between 40mm and 80mm.

[0010] Further configuration: The spiral stirrups are made of steel bars with a diameter greater than 12mm.

[0011] Further configuration: Both ends of the spiral stirrup are provided with straight sections, and the straight sections are arranged perpendicularly to the main bars connected to them.

[0012] Further configuration: The length of the straight section is greater than 1.5 times the outer perimeter of the main reinforcement bar it connects to.

[0013] Further details: The main reinforcing bars are made of precision-rolled threaded steel.

[0014] As a second aspect, this application relates to a variable cross-section frame column, which includes an upper column, a lower column, a variable cross-section transition section, and a variable cross-section frame column steel reinforcement cage as described above, which is built into the column.

[0015] Further configuration: The variable cross-section transition section is equipped with transverse and / or longitudinal reinforcing bars.

[0016] Compared with existing technologies, the solution in this application has the following advantages:

[0017] 1. The variable cross-section frame column reinforcement cage involved in this application uses a single steel bar and is formed by a winding machine and a corresponding shape template of the variable cross-section frame column to form a spiral stirrup of the design size of the variable cross-section frame column reinforcement cage. The spiral stirrup is then tied to the main reinforcement to form the variable cross-section frame column reinforcement cage of this application. The reinforcement cage has good structural integrity. The spiral stirrup 1 can play a hoop effect on the concrete in the core area of ​​the variable cross-section frame column, effectively improving the load-bearing capacity and seismic performance of the variable cross-section frame column.

[0018] 2. The variable cross-section frame column involved in this application uses spiral stirrups instead of traditional single-piece separated stirrups, which reduces the number of steel bar cut-offs and bends, improves the standardization of the steel bar skeleton fabrication of the variable cross-section frame column, and also reduces the amount of stirrups used, thereby achieving the goal of reducing construction costs.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0021] Fig. 1 This is a structural schematic diagram of one embodiment of the steel reinforcement cage for a variable cross-section frame column according to this application;

[0022] Fig. 2This is a front view of one embodiment of the steel reinforcement cage for a variable cross-section frame column according to this application;

[0023] Fig. 3 This is a structural schematic diagram of one embodiment of the variable cross-section frame column of this application.

[0024] In the figure, 1 is the spiral stirrup; 11 is the straight section; 2 is the main reinforcement; 21 is the first main reinforcement; 22 is the second main reinforcement; 23 is the third main reinforcement; 101 is the upper column; 102 is the lower column; and 103 is the variable cross-section transition section. Detailed Implementation

[0025] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0026] It should be understood that the steps described in the method embodiments of this utility model may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this utility model is not limited in this respect.

[0027] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "connection" can refer to a direct connection or an indirect connection via intermediate components (elements). The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the following description.

[0028] It should be noted that the concepts of "first" and "second" mentioned in this utility model are only used to distinguish between devices, modules or units, and are not used to limit these devices, modules or units to necessarily be different devices, modules or units, nor are they used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0029] To address the issues of poor integrity and cumbersome fabrication associated with using single-piece, separate stirrups in the reinforcement cage of variable cross-section frame columns, please consider... Figs. 1 to 3 This application proposes a steel reinforcement cage for a variable cross-section frame column, which includes main reinforcement 2 and spiral stirrups 1. By binding the continuous spiral stirrups 1 with the main reinforcement 2 to form an integral steel reinforcement cage, the structural integrity of the steel reinforcement cage of the precast variable cross-section frame column can be effectively enhanced, and the number of stirrup cut-offs and bends can be reduced, thereby improving construction efficiency.

[0030] It should be noted that the variable cross-section frame column constructed in this application includes an upper column 101, a lower column 102, and a variable cross-section transition section 103 connecting the upper column 101 and the lower column 102. The cross-sectional area of ​​the upper column 101 is smaller than that of the lower column 102. Therefore, the main reinforcement 2 of this application includes a first main reinforcement 21, a second main reinforcement 22, and a third main reinforcement 23 corresponding to the upper column 101, the lower column 102, and the variable cross-section transition section 103. The third main reinforcement 23 is inclinedly connected between the first main reinforcement 21 and the second main reinforcement 22, and the main reinforcement 2 is arranged according to the outer periphery of the variable cross-section frame column.

[0031] The spiral stirrup 1 of this application extends along the length of the main reinforcement 2 and is spirally wound around the outer periphery of the main reinforcement 2. Since the cross-sectional area of ​​the upper column 101 of the frame column is smaller than that of the lower column 102, the maximum diameter of the spiral stirrup 1 at the second main reinforcement 22 is greater than its maximum diameter at the first main reinforcement 21. Furthermore, the maximum diameter of the spiral stirrup 1 at the third stirrup gradually decreases from the second main reinforcement 22 toward the first main reinforcement 21, so that the spiral stirrup 1 can be tightly wrapped around the outer periphery of the main reinforcement 2 to ensure the firmness of the subsequent binding of the main reinforcement 2 and the spiral stirrup 1.

[0032] Furthermore, in this embodiment, the spiral stirrup 1 is made by winding a single steel bar, which effectively improves the structural integrity of the spiral stirrup 1 and enhances the structural integrity of the steel reinforcement skeleton of the variable cross-section frame column of this application. It also improves the hoop effect of the stirrup on the core area concrete of the variable cross-section frame column, and the spiral rib design can effectively increase the bond force between the steel reinforcement and the concrete, so that the frame column structure can maintain a stable state under dynamic loads such as earthquakes, and can also effectively prevent the propagation of concrete cracks. Therefore, in this application, the spiral stirrup 1 forms a ring tension in the variable cross-section frame column, which can greatly increase the allowable bending moment and the lateral torsional bearing capacity of the variable cross-section frame column, thereby improving the overall bearing capacity of the variable cross-section frame column of this application. Moreover, due to the stress concentration caused by the cross-sectional change of the variable cross-section frame column, the spiral stirrup 1 can effectively disperse the stress and improve the stability of the structure.

[0033] In other embodiments, for ease of transportation, the spiral stirrup 1 includes multiple reinforcing bars. The ends of the multiple reinforcing bars are connected to form a single reinforcing bar, which is then wound around the outer periphery of the main reinforcing bar 2 to form a spiral structure.

[0034] This application reduces the number of cuts and bends of the stirrup reinforcement 1 when using a single steel bar to form a spiral stirrup 1, thus reducing the amount of stirrup reinforcement used. Furthermore, when tied with the main reinforcement 2, the spiral stirrup 1 automatically supports the framework, facilitating the positioning and tying of the main reinforcement 2. The spiral stirrup 1 is wound using a spiral stirrup machine or a spiral reinforcement forming machine. The use of a single steel bar reduces the hooking and overlapping of open bends, thereby accelerating the tying speed between the main reinforcement 2 and the spiral stirrup 1, improving tying efficiency, and shortening construction time. In addition, this embodiment uses a wrapping or looping method to tightly tie the main reinforcement 2 and the spiral stirrup 1 together. During tying, it is necessary to ensure that all intersections of the spiral stirrup 1 and the main reinforcement 2 are securely tied to prevent loosening or detachment.

[0035] Furthermore, the spiral stirrup 1 of this application has a straight section 11 at both ends. The straight section is perpendicular to the main reinforcement 2, and the length of the straight section 11 is greater than 1.5 times the outer perimeter of the main reinforcement 2 to which it is connected. This application improves the stability of the binding between the spiral stirrup 1 and the main reinforcement 2 by setting the straight section 11, thereby improving the structural stability of the steel reinforcement skeleton of the variable cross-section frame column of this application.

[0036] In this embodiment, the pitch of the spiral stirrup 1 is between 40mm and 80mm. Spiral stirrups 1 within this pitch range provide good confinement to the concrete, improving the structure's load-bearing capacity and seismic performance. Furthermore, in this embodiment, the spiral stirrup 1 preferably uses steel bars with a diameter greater than 12mm to ensure its structural strength.

[0037] The main reinforcement 2 of this application can be formed by bending a single steel bar twice to create a three-section main reinforcement 21, a second main reinforcement 22, and a third main reinforcement 23. Alternatively, the two ends of the third main reinforcement 23 can be connected and fixed to the ends of the first main reinforcement 21 and the second main reinforcement 22 respectively by welding or connecting sleeves, thus forming a single main reinforcement 2. In this embodiment, the main reinforcement 2 is preferably made of fine-rolled threaded steel. Fine-rolled threaded steel can improve the load-bearing capacity and seismic resistance of the variable cross-section frame column. At the same time, fine-rolled threaded steel can facilitate the splicing of the main reinforcement 2, thereby facilitating the construction of frame columns of different sizes and making the operation convenient.

[0038] In summary, the variable cross-section frame column reinforcement cage of this application uses a single steel bar and is formed by a winding machine and a corresponding shape template of the variable cross-section frame column to form a spiral stirrup 1 of the designed size of the variable cross-section frame column reinforcement cage. The spiral stirrup 1 is then tied to the main reinforcement 2 to form the variable cross-section frame column reinforcement cage of this application. This reinforcement cage has good structural integrity. The spiral stirrup 11 can play a hoop effect on the concrete in the core area of ​​the variable cross-section frame column, effectively improving the load-bearing capacity and seismic performance of the variable cross-section frame column.

[0039] Furthermore, this application uses spiral stirrups 1 instead of traditional single-piece separated stirrups, which reduces the number of times the steel bars are cut and bent, improves the standardization of the steel reinforcement cage fabrication of variable cross-section frame columns, and also reduces the amount of stirrups used, thereby achieving the goal of reducing construction costs.

[0040] This application also relates to a variable cross-section frame column, comprising an upper column 101, a lower column 102, and a variable cross-section transition section 103 connecting the upper column 101 and the lower column 102. The variable cross-section frame column has an internal steel reinforcement cage, which is the variable cross-section frame column steel reinforcement cage described above. This variable cross-section frame column steel reinforcement cage effectively supports the structure of the variable cross-section frame column, and the steel reinforcement cage and concrete work together to form a reinforced concrete structure, ensuring the structural strength and load-bearing capacity of the variable cross-section frame column of this application.

[0041] During construction of the variable cross-section frame column of this application, the main reinforcement bars 2 and the spiral stirrups 1 are first processed separately. Then, the main reinforcement bars 2 and the spiral stirrups are tied together to form a complete steel reinforcement cage. Subsequently, concrete can be poured to form the required variable cross-section frame column. During the pouring process, attention should be paid to the stability and positional accuracy of the steel reinforcement cage. At the same time, a vibrator can be used to vibrate and compact the concrete by dragging it horizontally. A vibrating beam is used to lift and level the slurry to ensure a tight bond between the concrete and the steel reinforcement cage. Finally, the pouring of the variable cross-section frame column is completed.

[0042] Furthermore, since the variable cross-section frame column experiences stress in its variable cross-section transition section 103, this application incorporates horizontal or vertical reinforcing bars in the variable cross-section transition section 103 to enhance the load-bearing capacity of this area. Simultaneously, in special cases, the main reinforcing bar 2 located at the variable cross-section transition section 103 needs to be disconnected. The first reinforcing bar in the upper column 101 is extended to form a dowel bar and inserted into the lower column 102, thereby forming an effective connection with the second reinforcing bar in the lower column 102. This ensures continuous force transmission at the variable cross-section transition section 103 and improves the overall structural stability of the variable cross-section frame column.

[0043] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A variable cross-section frame column reinforcement cage, characterized in that, The structure includes main reinforcement bars and spiral stirrups. The main reinforcement bars correspond to the upper column, lower column, and variable cross-section transition section of the frame column, including a first main reinforcement bar, a second main reinforcement bar, and a third main reinforcement bar. The third main reinforcement bar is inclinedly connected between the first and second main reinforcement bars. The spiral stirrups are spirally wound around the outer periphery of the main reinforcement bars along the extension direction of the main reinforcement bars. The diameter of the spiral stirrups at the second main reinforcement bar is larger than its diameter at the first main reinforcement bar. The diameter of the spiral stirrups at the third main reinforcement bar gradually decreases from the second main reinforcement bar towards the first main reinforcement bar.

2. The variable cross-section frame column reinforcement cage according to claim 1, characterized in that, The spiral stirrups are made by winding a single steel bar.

3. The variable cross-section frame column reinforcement cage according to claim 1, characterized in that, The spiral stirrup comprises multiple reinforcing bars, and the ends of the multiple reinforcing bars are connected to form a single reinforcing bar to form a spiral structure by winding around the outer periphery of the main reinforcing bar.

4. The variable cross-section frame column reinforcement cage according to claim 1, characterized in that, The pitch of the spiral stirrups ranges from 40mm to 80mm.

5. The variable cross-section frame column reinforcement cage according to claim 1, characterized in that, The spiral stirrups are made of steel bars with a diameter greater than 12mm.

6. The variable cross-section frame column reinforcement cage according to claim 1, characterized in that, Both ends of the spiral stirrup are provided with straight sections, and the straight sections are arranged perpendicularly to the main bars connected to them.

7. The variable cross-section frame column reinforcement cage according to claim 6, characterized in that, The length of the straight section is greater than 1.5 times the outer perimeter of the main reinforcement bar it connects to.

8. The variable cross-section frame column reinforcement cage according to claim 1, characterized in that, The main reinforcing bars are made of precision-rolled threaded steel.

9. A variable cross-section frame column, characterized in that, It includes an upper column, a lower column, a variable cross-section transition section, and a variable cross-section frame column steel reinforcement cage as described in any one of claims 1-8, which is built into the column.

10. The variable cross-section frame column according to claim 9, characterized in that, The variable cross-section transition section is provided with transverse and / or longitudinal reinforcing bars.

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