High-rise building high-strength high-ductility aseismatic concrete aseismatic connecting joint

Abstract

The utility model relates to high -rise building technical field discloses high -rise building high -strength high ductility aseismatic concrete aseismatic connecting joint, including fixed column one, the inner wall upper portion of fixed column one is connected with the I -beam connecting beam with fixedly, the outer wall left and right sides of I -beam connecting beam all are connected with a plurality of threaded column one with thread, the outer wall front and back end of a plurality of threaded column one all are connected with the nut one with thread, the outer wall upper portion left and right sides of fixed column one all are connected with the fixed plate with fixedly, the outer wall of two fixed plates all are connected with a plurality of reinforcing steel bars with fixedly, the outer wall left and right sides of I -beam connecting beam all are provided with connecting column, the inner wall of two connecting columns with the outer wall left and right sides of I -beam connecting beam are engaged. In the utility model, through fixed column one and I -beam connecting beam cooperation, the overall structural strength and carrying capacity are strengthened, ensure that building can stably bear upper load, and fixed plate and reinforcing steel bar increase and connect with surrounding structure and the adhesion with concrete.

Description

Technical Field

[0001] This utility model relates to the field of high-rise building technology, and in particular to a high-strength, high-ductility, earthquake-resistant concrete seismic connection node for high-rise buildings. Background Technology

[0002] With the acceleration of urbanization and the increasing scarcity of land resources, high-rise buildings have become the main trend in urban construction. These high-rise buildings not only meet people's needs for residential, office and commercial spaces, but also make high-rise buildings the main trend in urban construction. Therefore, high-strength and high-ductility seismic-resistant concrete seismic connection nodes are needed for high-rise buildings.

[0003] A search revealed Chinese patent publication number CN112282472B, which discloses a highly earthquake-resistant concrete beam-column connection node. The node includes a precast concrete column, a concrete beam, a corbel, an L-shaped fixing plate, and right-angle reinforcing bars. The top surface of the corbel consists of a stepped high-level platform and a low-level platform. A cylindrical blind hole is provided on the low-level platform, and a square blind hole is provided at the center of the bottom surface of the cylindrical blind hole. A damping component is provided on one side of the lower end face of the concrete beam. One end of the concrete beam is mounted on the low-level platform of the corbel, and the damping component is installed in the cylindrical and square blind holes. The L-shaped fixing plate... The fixed plate is set at the joint of the precast concrete column and the concrete beam, and the right-angle reinforcing bar is set at the corner of the L-shaped fixed plate. This invention is a connection node for high seismic resistance concrete beam and column. It is simple to assemble, easy and quick to install, and has good seismic resistance. It improves the strength and deformation capacity of the beam and column joint, and improves the strength, integrity and cooperation of the beam and column. It has high comprehensive strength and strong practicality. However, it relies on the damping components installed on the lower end face of the concrete beam and the blind hole of the corbel low-level platform for damping. It cannot effectively dissipate energy when facing extremely strong earthquakes, resulting in the structure being subjected to a large impact. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a high-strength, high-ductility, earthquake-resistant concrete seismic connection node for high-rise buildings. It aims to improve the problem that the existing technology relies on damping components installed on the lower end face of the concrete beam and in the blind hole of the corbel low-level platform for damping, which cannot effectively dissipate energy when facing extremely strong earthquakes, resulting in the structure being subjected to a large impact.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a high-strength, high-ductility, earthquake-resistant concrete seismic connection node for high-rise buildings, comprising a fixed column, an I-beam fixedly connected to the upper middle part of the inner wall of the fixed column, multiple threaded columns threadedly connected to the left and right sides of the outer wall of the I-beam, nuts threadedly connected to the front and rear ends of the outer walls of the multiple threaded columns, a fixing plate fixedly connected to the upper middle left and right sides of the outer wall of the fixed column, multiple reinforcing bars fixedly connected to the outer walls of the two fixing plates, connecting columns provided on the left and right sides of the outer wall of the I-beam, the inner walls of the two connecting columns engaging with the left and right sides of the outer wall of the I-beam, multiple mounting holes provided on the outer walls of the two connecting columns, the inner walls of the multiple mounting holes threadedly connected to the multiple threaded columns, a resistance device fixedly connected to the left and right sides of the middle part of the outer wall of the fixed column, the other end of the two resistance devices fixedly connected to the bottom of the two mounting holes, and a fixing mechanism provided on the front and rear sides of the bottom of the two connecting columns.

[0006] The above technical solution achieves a fixed connection between components through an I-beam, a threaded column, and a nut. The steel bars on the fixing plate further enhance the structural strength. The connecting column and the I-beam are tightly connected by snap-fit ​​and threaded connection to ensure the stability of the connection. The key innovation of this node is the setting of the resistance device. One end of the device is connected to the fixing column, and the other end is connected to the bottom of the mounting hole. When subjected to earthquakes and external impacts, it can effectively buffer and dissipate energy, improve the seismic resistance of the connection node, and thus enhance the safety and stability of high-rise buildings in earthquakes.

[0007] As a further description of the above technical solution:

[0008] The fixing mechanism includes multiple annular plates, which are respectively fixedly connected to the bottom front and rear sides of the two connecting columns. Each of the multiple annular plates is fixedly connected to the top of a connecting block 1, and the top of each of the multiple connecting blocks 1 is fixed to the bottom of the two connecting columns. Each of the multiple annular plates has an adjustment hole on its outer wall. Each of the multiple annular plates has an adjustment ring slidably connected to its inner wall. Each of the multiple adjustment rings has a connecting block 2 fixedly connected to the bottom of its outer wall. Each of the multiple adjustment holes has a threaded post 3 threadedly connected to its inner wall. Each of the multiple threaded posts 3 has a nut 3 threadedly connected to its front and rear ends.

[0009] The above technical solution involves multiple annular plates distributed on the front and rear sides of the bottom of the connecting column. A basic connection structure is constructed by connecting block one tightly connecting to the connecting column. Adjustment holes are located on the outer wall of the annular plates, allowing the adjustment ring to slide on the inner wall. The addition of connecting block two further enhances the stability of the adjustment ring. The threaded connection between threaded column three and the adjustment hole, along with the use of nut three, allows the position of the adjustment ring to be adjusted and fixed according to actual needs. When fine-tuning of the fixing structure at the bottom of the connecting column is required, rotating nut three adjusts the position of threaded column three in the adjustment hole, thereby changing the position of the adjustment ring. This optimizes the fixing method at the bottom of the connecting column, ensuring the stability of the building structure.

[0010] As a further description of the above technical solution:

[0011] Each of the two connecting columns has a mounting groove at the bottom center, and the tops of the two resistances are fixedly connected to the inner wall of the mounting groove.

[0012] Through the above technical solution: by fixing the top of the damper in the mounting groove, when the building structure is subjected to external forces, the damper can effectively buffer and consume the energy generated by the earthquake, thereby reducing the impact force on the connecting columns and the entire building structure and improving the seismic performance of the building.

[0013] As a further description of the above technical solution:

[0014] A fixing block is fixedly connected to the top of the outer wall of the fixing column one. Grooves are provided on the left and right sides of the outer wall of the fixing block. Fixing column two is fixedly connected to the inner wall of the two grooves. Two rotating rods are rotatably connected to the front and rear ends of the outer walls of the two fixing columns two. A connecting plate is fixedly connected to the other end of the two rotating rods.

[0015] The above technical solution involves creating grooves on the left and right sides of the outer wall of the fixing block. These grooves serve to house the second fixing post and securely fix it to the inner wall of the groove. The front and rear ends of the outer wall of the second fixing post are rotatably connected to two rotating rods. These rotating rods can rotate around the second fixing post, and the other end of each rotating rod is connected to a connecting plate. The connecting plate is used to connect with other components, thereby achieving the connection between the first fixing post and other parts.

[0016] As a further description of the above technical solution:

[0017] Nuts are provided on the front and rear sides of the outer walls of the two connecting plates, and threaded posts are fixedly connected to the front and rear sides of the top of the two connecting posts. The inner walls of the two nuts are threadedly connected to the outer walls of the two threaded posts.

[0018] The above technical solution allows for a threaded connection between the inner wall of the nut and the outer wall of the threaded post. When the connecting plate and the connecting post need to be connected, simply screw the nut onto the threaded post. The tight fit of the threads will ensure a secure connection between the two. Furthermore, disassembly can be easily achieved by rotating the nut in the opposite direction.

[0019] As a further description of the above technical solution:

[0020] A mounting groove 2 is provided on the upper middle part of the front side of the fixed column 1, and a displacement sensor is fixedly connected to the inner wall of the mounting groove 2.

[0021] The above technical solution involves fixing a displacement sensor to the inner wall of the mounting groove 2. After installation, the displacement sensor can monitor the displacement of the fixed column 1 in real time during use.

[0022] As a further description of the above technical solution:

[0023] The upper left and right sides of the outer wall of the fixed column one are provided with mounting groove three, and the inner walls of the two mounting groove three are fixedly connected to the outer walls of the two fixed plates.

[0024] The above technical solution involves installing the fixing plate at a specific position on the fixing column, which enhances the structural strength of the fixing column and provides a foundation for the connection of other components.

[0025] As a further description of the above technical solution:

[0026] The top front and rear sides of the two connecting columns are provided with mounting holes 2, and the inner walls of the two mounting holes 2 are fixedly connected to the bottom of the outer wall of the nut 2.

[0027] The above technical solution achieves a stable connection between the connecting plate and the connecting column through the threaded connection between the threaded column two and the nut two. The fixing of the nut two by the mounting hole two further ensures the stability of this connection.

[0028] This utility model has the following beneficial effects:

[0029] 1. In this utility model, the overall structural strength and load-bearing capacity are enhanced by the cooperation of the fixed column and the I-beam, ensuring that the building can stably bear the upper load. The fixed plate and steel bars increase the connection with the surrounding structure and the bond with the concrete, so that the nodes and concrete work together to improve stability. The connection method between the connecting column and the I-beam ensures the rigidity of the structure, while the resistance device dissipates energy through deformation during an earthquake, effectively reducing the impact force, which greatly improves the safety of the building during an earthquake and provides a reliable guarantee for high-rise buildings to resist earthquake disasters.

[0030] 2. In this utility model, the sliding connection between the adjusting ring and the annular plate gives the connecting column adjustable characteristics, which can flexibly adjust the fixed state according to actual needs. The threaded column three and the threaded hole are threaded together to facilitate precise control of the position of the adjusting ring. The nut three can lock the adjusting ring in a suitable position, realizing flexible adjustment and precise locking of the fixed state of the connecting column, improving the adaptability of the building structure under different working conditions, and enhancing the stability and reliability of the overall structure. Attached Figure Description

[0031] Figure 1 This is a perspective view of the high-strength, high-ductility, earthquake-resistant concrete seismic connection node for high-rise buildings proposed in this utility model.

[0032] Figure 2 This is a front view of the high-strength, high-ductility, earthquake-resistant concrete seismic connection node for high-rise buildings proposed in this utility model.

[0033] Figure 3 This is a partial structural exploded view of the high-strength, high-ductility, earthquake-resistant concrete seismic connection node for high-rise buildings proposed in this utility model.

[0034] Figure 4 This is a schematic diagram of the fixing mechanism for the high-strength, high-ductility, earthquake-resistant concrete seismic connection node for high-rise buildings proposed in this utility model.

[0035] Figure 5 This is a side view of the high-strength, high-ductility, earthquake-resistant concrete seismic connection node for high-rise buildings proposed in this utility model.

[0036] Legend:

[0037] 1. Fixed column one; 2. Fixing mechanism; 201. Ring plate; 202. Connecting block one; 203. Adjusting hole; 204. Adjusting ring; 205. Connecting block two; 206. Threaded column three; 207. Nut three; 3. I-shaped connecting beam; 4. Threaded column one; 5. Nut one; 6. Fixing plate; 7. Reinforcing bar; 8. Connecting column; 9. Mounting hole one; 10. Resistance device; 11. Mounting groove one; 12. Fixing block; 13. Groove; 14. Fixed column two; 15. Rotating rod; 16. Connecting plate; 17. Nut two; 18. Threaded column two; 19. Mounting groove two; 20. Displacement sensor; 21. Mounting groove three; 22. Mounting hole two. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Reference Figure 1 , Figure 3 and Figure 4 An embodiment of this utility model provides a high-strength, high-ductility, earthquake-resistant concrete seismic connection node for high-rise buildings, comprising a fixed column 1, an I-beam 3 fixedly connected to the upper middle part of the inner wall of the fixed column 1, multiple threaded columns 4 threadedly connected to the left and right sides of the outer wall of the I-beam 3, nuts 5 threadedly connected to the front and rear ends of the outer walls of the multiple threaded columns 4, a fixed plate 6 fixedly connected to the upper middle left and right sides of the outer wall of the fixed column 1, multiple reinforcing bars 7 fixedly connected to the outer walls of the two fixed plates 6, a connecting column 8 provided on the left and right sides of the outer wall of the I-beam 3, the inner walls of the two connecting columns 8 engaging with the left and right sides of the outer wall of the I-beam 3, multiple mounting holes 9 provided on the outer walls of the two connecting columns 8, the inner walls of the multiple mounting holes 9 threadedly connected to the multiple threaded columns 4, a resistance device 10 fixedly connected to the left and right sides of the middle part of the outer wall of the fixed column 1, the other end of the two resistance devices 10 fixedly connected to the bottom of the two mounting holes 9, and a fixing mechanism 2 provided on the front and rear sides of the bottom of the two connecting columns 8.

[0040] Specifically, in the high-strength, high-ductility, earthquake-resistant concrete seismic connection node of high-rise buildings, the fixed column-1 serves as the foundation to bear the upper load, the I-beam 3 enhances the strength of the fixed column-1, and the connecting column 8 is connected by the threaded column-4 and the nut-5, the fixing plate 6 increases the stability of the fixed column-1, the steel bar 7 enhances the bonding force with the concrete, the connecting column 8 and the I-beam 3 are firmly connected by snap-fit ​​and threaded connection, and the damper 10 connects the fixed column-1 and the mounting hole-9 on the connecting column 8 to absorb energy and reduce vibration during earthquakes, ensuring the safety and stability of high-rise buildings during earthquakes.

[0041] Reference Figure 1 , Figure 2 and Figure 4The fixing mechanism 2 includes multiple annular plates 201, which are respectively fixedly connected to the bottom front and rear sides of two connecting columns 8. Each annular plate 201 has a connecting block 202 fixedly connected to its top. The top of each connecting block 202 is fixedly connected to the bottom of the two connecting columns 8. Each annular plate 201 has an adjustment hole 203 on its outer wall. Each annular plate 201 has an adjustment ring 204 slidably connected to its inner wall. Each adjustment ring 204 has a connecting block 205 fixedly connected to its bottom outer wall. Each adjustment hole 203 has a threaded post 206 threadedly connected to its inner wall. Each threaded post 206 has a nut 207 threadedly connected to its front and rear ends.

[0042] Specifically, multiple annular plates 201 are securely installed on the bottom front and rear sides of the connecting column 8 via connecting block 1 202, providing a support base for the entire fixing mechanism 2. The adjusting ring 204 inside the annular plate 201 can slide freely and its position can be flexibly adjusted according to actual needs. The threaded engagement between the adjusting hole 203 and the threaded column 3 206, as well as the use of nut 3 207, allows the position of the adjusting ring 204 to be precisely locked. The connecting block 205 at the bottom of the adjusting ring 204 is used to connect other components, enhancing the practicality of the fixing mechanism 2 and improving the adaptability and reliability of the engineering structure.

[0043] Reference Figure 2 , Figure 4 and Figure 5 Each of the two connecting columns 8 has a mounting groove 11 at the bottom center, and the top of each of the two resistances 10 is fixedly connected to the inner wall of the mounting groove 11. A fixing block 12 is fixedly connected to the top of the outer wall of the fixing column 11. Grooves 13 are provided on the left and right sides of the outer wall of the fixing block 12. Fixing column 14 is fixedly connected to the inner wall of the two grooves 13. Two rotating rods 15 are rotatably connected to the front and rear ends of the outer walls of the two fixing columns 14. A connecting plate 16 is fixedly connected to the other end of each of the two rotating rods 15. Nuts 17 are provided on the front and rear sides of the outer walls of the two connecting plates 16. Threaded columns 18 are fixedly connected to the front and rear sides of the top of the two connecting columns 8. The inner walls of the two nuts 17 are threadedly connected to the outer walls of the two threaded columns 18.

[0044] Specifically, by setting an installation groove 11 at the bottom of the connecting column 8 to connect with the resistance device 10, the seismic resistance of the structure is enhanced. The top of the fixed column 1 is constructed with a flexible connection structure using a fixing block 12, a fixed column 2 14, a rotating rod 15 and a connecting plate 16. Then, the connecting plate 16 and the connecting column 8 are stably connected by a nut 2 17 and a threaded connection with a threaded column 2 18.

[0045] Reference Figure 1 , Figure 2 and Figure 4The upper front side of the fixed column 1 has a mounting groove 29, and the inner wall of the mounting groove 219 is fixedly connected to the displacement sensor 20; the upper left and right sides of the outer wall of the fixed column 1 have mounting grooves 31, and the inner walls of the two mounting grooves 31 are fixedly connected to the outer walls of the two fixed plates 6; the front and rear top sides of the two connecting columns 8 have mounting holes 22, and the inner walls of the two mounting holes 22 are fixedly connected to the bottom of the outer wall of the nut 217.

[0046] Specifically, on the fixed column 1, the combination of the mounting slot 2 19 and the displacement sensor 20 gives the structure the function of real-time displacement monitoring, which helps to provide early warning of safety hazards. The connection between the mounting slot 3 21 and the fixed plate 6 enhances the structural strength and stability of the fixed column 1. On the connecting column 8, the mounting hole 22 fixes the nut 2 17, optimizes the connection structure between the connecting plate 16 and the connecting column 8, and improves the overall stability.

[0047] Working principle: The fixed column 1 serves as the core supporting component of the entire structure, bearing various loads transmitted from the superstructure. The I-beam 3 fixed in the upper middle part of its inner wall strengthens the structural strength of the fixed column 1 with its excellent bending and shear resistance. At the same time, the threaded column 4 and nut 5 are used to establish a connection with the connecting column 8. The fixing plates 6 on the upper left and right sides of the outer wall of the fixed column 1 increase the connection area with the surrounding structure and improve stability. The steel bars 7 on the fixing plates 6 strengthen the bond with the concrete structure, allowing the joint and concrete to work better together. The connecting column 8 and the I-beam 3 are initially positioned by snapping together. Then, the threaded connection between the threaded column 4 and the mounting hole 9 is used to achieve a stable rigid connection. When a strong earthquake occurs, the resistance device 10 connected to the left and right sides of the middle of the outer wall of the fixed column 1 plays a key role. One end of the resistance device 10 is connected to the fixed column 1, and the other end is connected to the bottom of the mounting hole 9. It dissipates the earthquake energy through its own deformation, greatly reducing the impact force on the connecting column 8 and the entire structure, thereby ensuring the safety of the building structure during an earthquake.

[0048] Furthermore, multiple annular plates 201 are securely installed on the front and rear sides of the bottom of the connecting column 8 via connecting block 1 202, providing basic support for the entire fixed adjustment system. When it is necessary to adjust the fixed state of the connecting column 8, since the adjusting ring 204 is slidably connected to the inner wall of the annular plate 201, the adjusting ring 204 can slide freely within the annular plate 201. By rotating the threaded column 3 206, since the threaded column 3 206 is threadedly connected to the adjusting hole 203, the position of the threaded column 3 206 within the adjusting hole 203 changes as the threaded column 3 206 rotates. After the threaded column 3 206 pushes or pulls the adjusting ring 204 to the appropriate position, tighten the nut 3 207. The nut 3 207 cooperates with the threaded column 3 206 to lock the position of the adjusting ring 204.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-strength, high-ductility, earthquake-resistant concrete seismic connection joint for high-rise buildings, comprising a fixed column (1), characterized in that: An I-beam (3) is fixedly connected to the upper middle part of the inner wall of the fixed column (1). Multiple threaded columns (4) are threadedly connected to the left and right sides of the outer wall of the I-beam (3). Nuts (5) are threadedly connected to the front and rear ends of the outer walls of the multiple threaded columns (4). Fixing plates (6) are fixedly connected to the upper middle left and right sides of the outer wall of the fixed column (1). Multiple reinforcing bars (7) are fixedly connected to the outer walls of the two fixing plates (6). Connecting columns (8) are provided on the left and right sides of the outer wall of the I-beam (3). The inner wall of the connecting column (8) engages with the outer wall of the I-beam (3) on the left and right sides. The outer walls of the two connecting columns (8) are provided with multiple mounting holes (9). The inner walls of the multiple mounting holes (9) are threadedly connected to the multiple threaded columns (4). The middle left and right sides of the outer wall of the fixed column (1) are fixedly connected with resistance devices (10). The other ends of the two resistance devices (10) are fixedly connected to the bottom of the two mounting holes (9). The bottom front and rear sides of the two connecting columns (8) are provided with fixing mechanisms (2).

2. The high-strength, high-ductility, seismic-resistant concrete seismic connection joint for high-rise buildings according to claim 1, characterized in that: The fixing mechanism (2) includes multiple annular plates (201), which are respectively fixedly connected to the bottom front and rear sides of the two connecting columns (8). The top of each of the multiple annular plates (201) is fixedly connected to a connecting block 1 (202), and the top of each of the multiple connecting blocks 1 (202) is fixedly connected to the bottom of the two connecting columns (8). The outer wall of each of the multiple annular plates (201) is provided with an adjustment hole (203). The inner wall of each of the multiple annular plates (201) is slidably connected to an adjustment ring (204). The bottom of the outer wall of each of the multiple adjustment rings (204) is fixedly connected to a connecting block 2 (205). The inner wall of each of the multiple adjustment holes (203) is threadedly connected to a threaded column 3 (206). The front and rear ends of each of the multiple threaded columns 3 (206) are threadedly connected to a nut 3 (207).

3. The high-strength, high-ductility, seismic-resistant concrete seismic connection joint for high-rise buildings according to claim 1, characterized in that: The bottom center of each of the two connecting columns (8) is provided with a mounting groove (11), and the top of each of the two resistances (10) is fixedly connected to the inner wall of the mounting groove (11).

4. The high-strength, high-ductility, seismic-resistant concrete seismic connection joint for high-rise buildings according to claim 1, characterized in that: A fixing block (12) is fixedly connected to the top of the outer wall of the fixing column (1). The left and right sides of the outer wall of the fixing block (12) are provided with grooves (13). The inner walls of the two grooves (13) are fixedly connected to the fixing column (14). The front and rear ends of the outer walls of the two fixing columns (14) are rotatably connected to two rotating rods (15). The other ends of the two rotating rods (15) are fixedly connected to a connecting plate (16).

5. The high-strength, high-ductility, seismic-resistant concrete seismic connection joint for high-rise buildings according to claim 4, characterized in that: Nuts 2 (17) are provided on the front and rear sides of the outer walls of the two connecting plates (16), and threaded columns 2 (18) are fixedly connected to the front and rear sides of the top of the two connecting columns (8). The inner walls of the two nuts 2 (17) are threadedly connected to the outer walls of the two threaded columns 2 (18).

6. The high-strength, high-ductility, seismic-resistant concrete seismic connection joint for high-rise buildings according to claim 1, characterized in that: The upper front side of the fixed column (1) is provided with a mounting groove (19), and a displacement sensor (20) is fixedly connected to the inner wall of the mounting groove (19).

7. The high-strength, high-ductility, seismic-resistant concrete seismic connection joint for high-rise buildings according to claim 1, characterized in that: The upper middle part of the outer wall of the fixed column (1) is provided with mounting grooves (21) on both the left and right sides. The inner walls of the two mounting grooves (21) are fixedly connected to the outer walls of the two fixed plates (6).

8. The high-strength, high-ductility, seismic-resistant concrete seismic connection joint for high-rise buildings according to claim 5, characterized in that: The top front and rear sides of the two connecting columns (8) are provided with mounting holes 22, and the inner walls of the two mounting holes 22 are fixedly connected to the bottom of the outer wall of the nut 2 (17).

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