Clamp assembly, reinforcing steel bar rotating device and reinforcing steel bar connecting system

Abstract

The utility model relates to the technical field of steel bar connection, in particular to a clamp assembly, a steel bar rotating device and a steel bar connecting system. The clamp assembly comprises a driving device and a clamp mechanism, the clamp mechanism further comprises a clamp head structure and a clamp wall structure which are connected, the end, away from the clamp head structure, of the clamp wall structure is connected with a first rod piece, and a bend is formed at the joint of the first rod piece and the clamp wall structure. And a universal joint is connected between the end part, far away from the clamp wall structure, of the first rod piece and the output shaft of the driving device. According to the clamp assembly, the clamp head structure can be effectively reduced to overcome the clamping force of a steel bar getting rid of the clamp head structure, and therefore the probability that the end of the steel bar gets rid of the clamp head structure due to jumping is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steel bar connection, in particular to a clamp assembly, a steel bar rotating device and a steel bar connection system. Background Art

[0002] The straight thread sleeve installation is a steel sleeve used for mechanical joints of steel bars to transmit axial tension or pressure of steel bars. The straight thread sleeve installation is divided into direct rolled straight thread sleeve installation, rib stripping rolled straight thread sleeve installation and upsetting straight thread sleeve installation.

[0003] At present, the steel bars used in pile foundations are often connected by straight threaded sleeves. Because the steel bars are long, at least two workers are needed to rotate the steel bars to connect the two steel bars through the sleeves during the construction process, which requires a lot of manpower and effort, and is slow.

[0004] To address these issues, researchers in this field have considered using a rotary motor coaxial with the rebar, coupled with a clamp to secure the rebar and drive its rotation, freeing up labor and reducing labor costs. For example, a patent application titled "Tool for Installing a Straight Threaded Sleeve" (Application Number: 2023217964282) includes a motor body with a rotating shaft having a clamp head welded to its end. By configuring the motor to drive the clamp head, and thus the rebar, this method saves time and effort, thereby reducing labor costs.

[0005] But when using, Figure 1 As shown in the figure, during rotation, the middle part will produce a large rotation deformation due to its own weight, which will cause the end of the steel bar to jump, causing the steel bar to easily detach from the clamp head structure, thereby affecting construction efficiency. Utility Model Content

[0006] The purpose of the present invention is to overcome the shortcomings of the background technology that during rotation, the middle part will produce a large rotation deformation due to its own weight, which makes it easy for the steel bars to detach from the clamp head structure, thereby affecting the construction efficiency, and provide a clamp assembly, a steel bar rotation device and a steel bar connection system.

[0007] In the first aspect, the utility model provides a clamp assembly, including a driving device and a clamp mechanism, the clamp mechanism also including a connected clamp head structure and a clamp wall structure, the clamp wall structure is connected to a first rod at the end away from the clamp head structure, the first rod is bent at the connection with the clamp wall structure, a universal joint is connected between the end of the first rod away from the clamp wall structure and the output shaft of the driving device, and the clamp head structure and the output shaft are arranged correspondingly.

[0008] The clamp assembly described in the present application is such that, during construction, a drive device is installed at the end of a steel bar. Due to the bend formed at the connection between the first rod and the clamp wall structure, the clamp head structure can clamp the steel bar from the side of the steel bar, which is more stable than clamping along the axial direction of the steel bar. In addition, a universal joint is connected between the end of the first rod away from the clamp wall structure and the output shaft of the drive device. The torsional force of the output shaft of the drive device is transmitted to the first rod, the clamp wall structure and the clamp head structure in sequence through the universal joint. The clamp head structure is arranged corresponding to the output shaft so that the clamp head structure can rotate around the rotation center of the output shaft, thereby driving the steel bar to rotate. When the steel bar rotates and its own weight produces a large rotation deformation, which will cause the end of the steel bar to jump, the universal joint is used to rotate in two directions, so that the clamp head structure can also swing along the radial direction of the output shaft within a certain range, thereby effectively reducing the clamping force of the clamp head structure used to overcome the steel bar to escape from the clamp head structure, thereby greatly reducing the probability of the steel bar end escaping from the clamp head structure due to jumping.

[0009] Preferably, the clamp head structure includes a first clamp head and a second clamp head that are arranged opposite to each other, a clamping space and an opening are formed between the first clamp head and the second clamp head, and the opening is arranged radially along the output shaft.

[0010] Preferably, the first rod and the clamp wall structure together form an arched structure, which has better force bearing capacity.

[0011] Preferably, the clamp head structure is further provided with a limiting ring protruding from one side of the first rod, the limiting ring is coaxially arranged with the output shaft, and the limiting ring is rotatably arranged together with the clamp head structure.

[0012] During construction, the end of the steel bar is extended into the limiting ring to reduce the amplitude of the steel bar end's vibration. It can also help reduce the clamping force of the clamp head structure used to overcome the steel bar's escape from the clamp head structure, thereby greatly reducing the probability of the steel bar end escaping from the clamp head structure due to vibration.

[0013] Preferably, the limiting ring is connected to the first rod.

[0014] Preferably, the limiting ring is hinged to the first rod, so that the limiting ring can swing towards or away from the output shaft, thereby making it easier for the first steel bar to extend into or pass through the limiting ring.

[0015] Preferably, the limiting ring is located between the clamp head structure and the driving device, making the structure more compact.

[0016] In a second aspect, the utility model provides a steel bar rotating device, comprising a first steel bar and a clamp assembly as described in the present application, wherein the clamp head structure clamps the first steel bar from one side of the first steel bar.

[0017] The steel bar rotating device described in the present application is that during construction, the clamp head structure clamps the first steel bar from one side of the first steel bar, and can clamp more stably than clamping along the axial direction of the first steel bar. In addition, a universal joint is connected between the end of the first rod away from the clamp wall structure and the output shaft of the driving device, and the torsional force of the output shaft of the driving device is transmitted to the first rod, the clamp wall structure and the clamp head structure in sequence through the universal joint, so that the clamp head structure rotates around the rotation center of the output shaft, thereby driving the first steel bar to rotate. When the first steel bar rotates and its own weight produces a large rotation deformation, which will drive the end of the first steel bar to jump, the universal joint is used to rotate in two directions, so that the clamp head structure can also swing along the radial direction of the output shaft within a certain range, thereby effectively reducing the clamping force of the clamp head structure used to overcome the first steel bar to escape from the clamp head structure, thereby greatly reducing the probability of the first steel bar end escaping from the clamp head structure due to jumping.

[0018] Preferably, the clamp assembly is located at the end of the first steel bar, and the output shaft and the first steel bar are coaxially spaced apart, which has a better effect.

[0019] In a third aspect, the utility model provides a steel bar connection system, further comprising a second steel bar and a steel bar rotation device as described in the present application, wherein the first steel bar and the second steel bar are connected via a steel bar sleeve, and the clamp assembly is located at an end of the first steel bar away from the steel bar sleeve.

[0020] The steel bar connection system described in the present application is that during construction, the clamp head structure clamps the first steel bar from one side of the first steel bar, and the torsional force of the output shaft of the driving device is transmitted to the first rod, the clamp wall structure and the clamp head structure in sequence through the universal joint, so that the clamp head structure rotates around the rotation center of the output shaft, thereby driving the first steel bar to rotate, so that the other end of the first steel bar rotates into the steel bar sleeve, so as to realize the connection between the first steel bar and the second steel bar through the steel bar sleeve. When the first steel bar rotates and its own weight produces a large rotation deformation, which will drive the end of the first steel bar to jump, the universal joint is used to rotate in two directions, so that the clamp head structure can also swing along the output shaft within a certain range, thereby effectively reducing the clamping force of the clamp head structure used to overcome the first steel bar from escaping from the clamp head structure, thereby greatly reducing the probability of the first steel bar end escaping from the clamp head structure due to jumping, and effectively ensuring the efficiency of the first steel bar and the second steel bar being connected through the steel bar sleeve.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. A clamp assembly described in the present application, during construction, the driving device is installed at the end of the steel bar. Since the first rod is bent at the connection between the first rod and the clamp wall structure, the clamp head structure can clamp the steel bar from the side, which is more stable than clamping along the axial direction of the steel bar. In addition, a universal joint is connected between the end of the first rod away from the clamp wall structure and the output shaft of the driving device. The torsional force of the output shaft of the driving device is transmitted to the first rod, the clamp wall structure and the clamp head structure in sequence through the universal joint, so that the clamp head structure rotates around the rotation center of the output shaft, thereby driving the steel bar to rotate. When the steel bar rotates and its own weight produces a large rotational deformation, which will cause the end of the steel bar to jump, the universal joint is used to rotate in two directions, so that the clamp head structure can also swing along the radial direction of the output shaft within a certain range, thereby effectively reducing the clamping force of the clamp head structure used to overcome the steel bar to escape from the clamp head structure, thereby greatly reducing the probability of the steel bar end escaping from the clamp head structure due to jumping.

[0023] 2. A steel bar rotating device described in the present application, during construction, the driving device is installed at the end of the steel bar. Since the first rod is bent at the connection between the first rod and the clamp wall structure, the clamp head structure can clamp the steel bar from the side, which is more stable than clamping along the axial direction of the steel bar. In addition, a universal joint is connected between the end of the first rod away from the clamp wall structure and the output shaft of the driving device. The torsional force of the output shaft of the driving device is transmitted to the first rod, the clamp wall structure and the clamp head structure in sequence through the universal joint, so that the clamp head structure rotates around the rotation center of the output shaft, thereby driving the steel bar to rotate. When the steel bar rotates and its own weight produces a large rotation deformation, which will cause the end of the steel bar to jump, the universal joint is used to rotate in two directions, so that the clamp head structure can also swing along the radial direction of the output shaft within a certain range, thereby effectively reducing the clamping force of the clamp head structure used to overcome the steel bar to escape from the clamp head structure, thereby greatly reducing the probability of the steel bar end escaping from the clamp head structure due to jumping.

[0024] 3. A steel bar connection system described in the present application, during construction, the clamp head structure clamps the first steel bar from one side of the first steel bar, and the torsional force of the output shaft of the driving device is transmitted to the first rod, the clamp wall structure and the clamp head structure in sequence through the universal joint, so that the clamp head structure rotates around the rotation center of the output shaft, thereby driving the first steel bar to rotate, so that the other end of the first steel bar rotates into the steel bar sleeve, so as to realize the connection between the first steel bar and the second steel bar through the steel bar sleeve. When the first steel bar rotates and its own weight produces a large rotation deformation, which will drive the end of the first steel bar to jump, the universal joint is capable of rotating in two directions, so that the clamp head structure can also swing along the output shaft within a certain range, thereby effectively reducing the clamping force of the clamp head structure used to overcome the first steel bar from escaping from the clamp head structure, thereby greatly reducing the probability of the first steel bar end escaping from the clamp head structure due to jumping, and effectively ensuring the efficiency of the first steel bar and the second steel bar being connected through the steel bar sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a clamp assembly described in this application (without an infinite position ring).

[0026] Figure 2 This is a schematic diagram of the structure of a clamp assembly (limiting ring) described in this application.

[0027] Figure 3 This is a schematic structural diagram of the clamp head structure described in this application.

[0028] Figure 4 This is a schematic structural diagram of a steel bar rotation device described in this application (without infinite position ring).

[0029] Figure 5 This is a structural schematic diagram of a steel bar rotation device (with a limiting ring) described in this application.

[0030] Figure 6 This is a structural schematic diagram of a steel bar connection system described in this application.

[0031] Markings in the figure: 1-driving device, 2-clamp head structure, 3-clamp wall structure, 4-first rod, 5-universal joint, 6-limiting ring, 7-first steel bar, 8-second steel bar, 9-steel sleeve, 10-hinge shaft, 11-output shaft, 12-first clamp head, 13-second clamp head, 14-clamping space, 15-opening, 16-connecting rod. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments. All technologies implemented based on the present invention fall within the scope of the present invention.

[0033] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating orientation or positional relationships, such as "upper," "lower," "left," "right," "center," "inside," and "outside," are based on the orientation or positional relationships shown in the accompanying drawings, or are the orientation or positional relationships in which the product / device / apparatus of the present invention is typically placed when in use. These terms indicating orientation or positional relationships are merely for the purpose of facilitating the description of the present invention or simplifying the description of the specific embodiments to facilitate a quick understanding of the solutions by technicians. They do not indicate or imply that a particular device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship, and therefore should not be construed as limiting the present invention.

[0034] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simply understood that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", and "parallel", and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the present utility model.

[0035] In addition, the expressions "first", "second", "third", etc. that appear in the terms are merely descriptions used to distinguish the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0036] In addition, in the description of the embodiments of the present invention, "several", "a plurality", and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0037] Furthermore, in the description of the technical solutions of this utility model, unless otherwise expressly specified / defined / restricted, the terms "disposed," "installed," "connected," "connected," "provided with," "laid," and "arranged" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections. They may be welding, riveting, bolting, threading, or other commonly used connection methods in the art. Such connections may be mechanical, electrical, or communication connections; they may be direct connections, indirect connections through an intermediate medium, or internal connections between two components.

[0038] Example 1

[0039] like Figure 1-3 As shown, a clamp assembly described in this embodiment includes a driving device 1 and a clamp mechanism, and the clamp mechanism also includes a clamp head structure 2 and a clamp wall structure 3 connected to each other, and the end of the clamp wall structure 3 away from the clamp head structure 2 is connected to a first rod 4, and a bend is formed at the connection between the first rod 4 and the clamp wall structure 3, and a universal joint 5 is connected between the end of the first rod 4 away from the clamp wall structure 3 and the output shaft 11 of the driving device 1, and the clamp head structure 2 and the output shaft 11 are arranged correspondingly.

[0040] In the clamp assembly described in this embodiment, during construction, the drive device 1 is installed at the end of the steel bar. Since the first rod 4 is bent at the connection between the clamp wall structure 3, the clamp head structure 2 can clamp the steel bar from the side of the steel bar, which is more stable than clamping along the axial direction of the steel bar. In addition, a universal joint 5 is connected between the end of the first rod 4 away from the clamp wall structure 3 and the output shaft 11 of the drive device 1. The torsional force of the output shaft 11 of the drive device 1 is transmitted to the first rod 4, the clamp wall structure 3 and the clamp head structure 2 in sequence through the universal joint 5, so that the clamp head structure 2 rotates around the rotation center of the output shaft 11, thereby driving the steel bar to rotate. When the steel bar rotates and its own weight produces a large rotation deformation, which will cause the end of the steel bar to jump, the universal joint 5 can rotate in two directions, so that the clamp head structure 2 can also swing along the radial direction of the output shaft 11 within a certain range, thereby effectively reducing the clamping force used by the clamp head structure 2 to overcome the steel bar to escape from the clamp head structure 2, thereby greatly reducing the probability of the steel bar end escaping from the clamp head structure 2 due to jumping.

[0041] The clamp head structure 2 can clamp the steel bar from the side of the steel bar, and the opening 15 is arranged radially along the output shaft 11. Specifically, preferably, the clamp head structure 2 is located on one side of the output shaft 11 along the length extension area.

[0042] The driving device 1 is preferably a motor, or a combination of a motor and a reducer, for providing power.

[0043] In one or more embodiments, the clamp head structure 2 includes a first clamp head 12 and a second clamp head 13 disposed opposite each other, with a clamping space 14 and an opening 15 formed between the first clamp head 12 and the second clamp head 13. The opening 15 faces one side of the output shaft 11. This enables the clamp head structure 2 to clamp the steel bar from the side.

[0044] In a preferred embodiment, the first clamp head 12 and the second clamp head 13 are connected via a rotating shaft, and a torsion spring is provided on the rotating shaft to provide a clamping force between the first clamp head 12 and the second clamp head 13.

[0045] In an optional embodiment, the first rod 4 and the clamp wall structure 3 together form an arched structure, which has better force resistance. In this case, the first rod 4 and the clamp wall structure 3 can be integrally formed.

[0046] The integral structure formed by the clamp head structure 2 and the clamp wall structure 3 can be realized by purchasing existing steel bar clamps.

[0047] In one or more embodiments, the clamp head structure 2 is further provided with a retaining ring 6 that protrudes from one side of the first rod 4. The retaining ring 6 is coaxially arranged with the output shaft 11 and rotates together with the clamp head structure 2. During construction, the end of the rebar is inserted into the retaining ring 6 to reduce the amplitude of the rebar end's vibration. This also helps reduce the clamping force required by the clamp head structure 2 to overcome the rebar's escape from the clamp head structure 2, thereby greatly reducing the probability of the rebar end escaping the clamp head structure 2 due to vibration.

[0048] In an optional embodiment, the limiting ring 6 is connected to the first rod 4 .

[0049] The limiting ring 6 may also be located on the side of the clamp head structure 2 away from the driving device 1. More preferably, the limiting ring 6 is located between the clamp head structure 2 and the driving device 1, making the structure more compact.

[0050] In a preferred embodiment, the limiting ring 6 is hinged to the first rod 4 so that the limiting ring 6 can swing toward or away from the output shaft 11 , thereby making it easier for the first steel bar 7 to extend into or pass through the limiting ring 6 .

[0051] Further preferred method: Figure 2 , a connecting rod 16 is connected to the outside of the limiting ring 6, and a notch toward the limiting ring 6 is provided on the first rod 4, and the end of the connecting rod 16 away from the limiting ring 6 extends into the notch, and the hinge shaft 10 passes through the first rod 4 and the connecting rod 16, so that the first rod 4 and the connecting rod 16 are hinged.

[0052] Example 2

[0053] like Figure 4 and 5 As shown, the utility model provides a steel bar rotating device, including a first steel bar 7 and a clamp assembly as described in Example 1, and the clamp head structure 2 clamps the first steel bar 7 from one side of the first steel bar 7.

[0054] The first steel bar 7 rotation device described in this embodiment, during construction, the clamp head structure 2 clamps the first steel bar 7 from one side of the first steel bar 7, which can clamp more stably than clamping along the axial direction of the first steel bar 7, and a universal joint 5 is connected between the end of the first rod 4 away from the clamp wall structure 3 and the output shaft 11 of the driving device 1. The torsional force of the output shaft 11 of the driving device 1 is transmitted to the first rod 4, the clamp wall structure 3 and the clamp head structure 2 in sequence through the universal joint 5, so that the clamp head structure 2 rotates around the rotation center of the output shaft 11, thereby driving the first steel bar 7 to rotate. When the first steel bar 7 rotates and its own weight produces a large rotation deformation, which will cause the end of the first steel bar 7 to jump, the universal joint 5 is capable of rotating in two directions, so that the clamp head structure 2 can also swing along the radial direction of the output shaft 11 within a certain range, thereby effectively reducing the clamping force of the clamp head structure 2 used to overcome the first steel bar 7 to escape from the clamp head structure 2, thereby greatly reducing the probability of the end of the first steel bar 7 escaping from the clamp head structure 2 due to jumping.

[0055] In a preferred embodiment, the clamp assembly is located at the end of the first steel bar 7, and the output shaft 11 and the first steel bar 7 are coaxially spaced apart, which has a better effect.

[0056] Example 3

[0057] like Figure 6 As shown, the utility model provides a steel bar connection system, including a first steel bar 7 and a steel bar rotation device as described in Example 2, the first steel bar 7 and the second steel bar 8 are connected by a steel bar sleeve 9, and the clamp assembly is located at the end of the first steel bar 7 away from the steel bar sleeve 9.

[0058] In the steel bar connection system described in this embodiment, during construction, the clamp head structure 2 clamps the first steel bar 7 from one side of the first steel bar 7, and the torsional force of the output shaft 11 of the driving device 1 is transmitted to the first rod 4, the clamp wall structure 3 and the clamp head structure 2 in sequence through the universal joint 5, so that the clamp head structure 2 rotates around the rotation center of the output shaft 11, thereby driving the first steel bar 7 to rotate, so that the other end of the first steel bar 7 rotates into the steel bar sleeve 9, so that the first steel bar 7 and the second steel bar 8 are connected through the steel bar sleeve 9. When the first steel bar 7 rotates and its own weight produces a large rotation deformation, which will cause the end of the first steel bar 7 to jump, the universal joint 5 is capable of rotating in two directions, so that the clamp head structure 2 can also swing along the radial direction of the output shaft 11 within a certain range, thereby effectively reducing the clamping force of the clamp head structure 2 used to overcome the first steel bar 7 from escaping from the clamp head structure 2, thereby greatly reducing the probability of the end of the first steel bar 7 escaping from the clamp head structure 2 due to jumping, and effectively ensuring the efficiency of the first steel bar 7 and the second steel bar 8 being connected through the steel sleeve 9.

[0059] During construction, the inner wall of the steel bar sleeve 9 has an internal thread, and the outer walls of the opposite ends of the first steel bar 7 and the second steel bar 8 are provided with external threads that match the internal thread.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A clamp assembly, characterized in that: The invention comprises a driving device (1) and a clamping mechanism, wherein the clamping mechanism comprises a clamp head structure (2) and a clamp wall structure (3) connected to each other, wherein the end of the clamp wall structure (3) away from the clamp head structure (2) is connected to a first rod (4), a bend is formed at the connection between the first rod (4) and the clamp wall structure (3), a universal joint (5) is connected between the end of the first rod (4) away from the clamp wall structure (3) and the output shaft (11) of the driving device (1), and the clamp head structure (2) and the output shaft (11) are arranged correspondingly.

2. A clamp assembly according to claim 1, characterized in that: The clamp head structure (2) comprises a first clamp head (12) and a second clamp head (13) arranged opposite to each other, a clamping space (14) and an opening (15) being formed between the first clamp head (12) and the second clamp head (13), and the opening (15) being arranged radially along the output shaft (11).

3. The clamp assembly according to claim 1, wherein: The first rod (4) and the clamp wall structure (3) together form a bow-shaped structure.

4. The clamp assembly according to claim 1, wherein: The clamp head structure (2) is further provided with a limiting ring (6) protruding from one side of the first rod (4); the limiting ring (6) is coaxially arranged with the output shaft (11); and the limiting ring (6) is rotatably arranged together with the clamp head structure (2).

5. A clamp assembly according to claim 4, characterized in that: The limiting ring (6) is connected to the first rod (4).

6. The clamp assembly according to claim 4, characterized in that: The limiting ring (6) is hinged to the first rod (4), so that the limiting ring (6) can swing in a direction close to or away from the output shaft (11).

7. The clamp assembly according to claim 4, characterized in that: The limiting ring (6) is located between the clamp head structure (2) and the driving device (1).

8. A steel bar rotating device, characterized in that: It comprises a first steel bar (7) and a clamp assembly according to any one of claims 1 to 7, wherein the clamp head structure (2) clamps the first steel bar (7) from one side of the first steel bar (7).

9. A steel bar rotating device according to claim 8, characterized in that: The clamp assembly is located at the end of the first steel bar (7), and the output shaft (11) and the first steel bar (7) are coaxially spaced apart.

10. A steel bar connection system, characterized in that: The invention also includes a second steel bar (8) and a steel bar rotating device according to any one of claims 8 to 9, wherein the first steel bar (7) and the second steel bar (8) are connected via a steel bar sleeve (9), and the clamp assembly is located at an end of the first steel bar (7) away from the steel bar sleeve (9).

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