Concrete pole top plugging device
By designing a concrete pole top sealing device including lifting components and sealing components, the corrosion and fall-off problems caused by hollows on the concrete pole top are solved, and a fast, safe and efficient sealing operation is achieved, reducing construction costs and operations are achieved. risk.
Patent Information
- Application Number
- CN202411529789.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2044-10-30
AI Technical Summary
In the prior art, cement sealing on the top of the concrete pole is prone to hollows due to the influence of the natural environment, resulting in bolt corrosion and overhead ground line falling off, which in turn threatens the safe and stable operation of the power grid. Traditional restoration methods are time-consuming and labor-intensive and inefficient.
A concrete rod top sealing device is designed, including a lifting assembly and a sealing assembly. The lifting assembly is used in conjunction with drones or other lifting equipment to achieve rapid lifting and precise positioning. The sealing assembly uses a combination of stainless steel top cover, elastic sleeve and spiral support, which can quickly adapt to concrete poles of different diameters and ensure safe operation through a buzzer warning device.
The device realizes rapid sealing of the top of the concrete pole, reduces labor intensity and operation risks, improves sealing quality and reliability, reduces material consumption and labor costs, and reduces overall construction costs.
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Figure CN119466370A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of concrete pole plugging, and in particular to a concrete pole top plugging device. Background Art
[0002] In the power transmission system, especially in the 35kV and 110kV transmission lines, reinforced concrete poles (also known as cement poles or concrete poles) are widely used. After long-term service, the original cement plugging on the top of these concrete poles may have holes due to the influence of the natural environment. This phenomenon is usually defined as a general defect in the defect management standard. This top hole will cause the internal bolts to be directly exposed to the outside and susceptible to corrosion. In severe cases, it may cause the bolts to break, which will cause the overhead ground wire to fall off, and may eventually cause the circuit to trip, posing a threat to the safe and stable operation of the power grid. The traditional repair method is to use cement to plug again, but this method is not only time-consuming and labor-intensive, but also inefficient.
[0003] Therefore, finding a more efficient and safer way to deal with the cavity problem at the top of the concrete pole has become a necessary research direction. This is not only an important measure to improve the reliability of the power transmission system, but also the key to reducing maintenance costs and improving work efficiency. Summary of the invention
[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.
[0005] In view of the above-mentioned problem that cement is used to seal the concrete pole, but this method is not only time-consuming and labor-intensive, but also inefficient, the present invention is proposed.
[0006] Therefore, the object of the present invention is to provide a concrete pole top plugging device.
[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a concrete pole top plugging device, comprising a hoisting assembly, including a mounting plate, a fixing plate arranged at the top of the mounting plate, the mounting plate being used to connect with the bottom plugging device, and a grab hook for hoisting the plugging device is arranged at the top of the fixing plate; and
[0008] The sealing assembly includes a top cover connected to the bottom end of the mounting plate through a threaded rod, the bottom end of the top cover is connected to the elastic sleeve through a connector, a spiral support is installed inside the elastic sleeve, the spiral support can support the expansion force generated by the elastic sleeve, so that the spiral support maintains a cylindrical shape to facilitate the later wrapping of the concrete rod.
[0009] As a preferred solution of the concrete pole top sealing device of the present invention, the grab hooks are symmetrically arranged with respect to the central axis of the fixed plate, a slot is formed at the top end between the two grab hooks for positioning, and the two grab hooks are arranged in an arc shape.
[0010] As a preferred solution of the concrete pole top plugging device of the present invention, a pressing plate is installed at the bottom end of the grab hook, one end of the pressing plate is connected to the fixing plate, and the pressing plate is arranged in an arc shape.
[0011] As a preferred solution of the concrete pole top sealing device described in the present invention, the lifting assembly also includes a buzzer light arranged on the top of the mounting plate, the buzzer light is located between the threaded rods, and the downward pressing angle of the pressing plate corresponds to the buzzer light to warn the user to grasp it firmly.
[0012] As a preferred solution of the concrete pole top plugging device of the present invention, the top cover is made of stainless steel.
[0013] As a preferred solution of the concrete pole top sealing device described in the present invention, the connecting piece includes a sealing gasket arranged between the elastic sleeve and the top cover, the sealing gasket is arranged in an "I-shape", and a limiting groove is formed between the sealing gaskets to be squeezed on the top of the elastic sleeve.
[0014] As a preferred solution of the concrete pole top sealing device described in the present invention, the connecting piece also includes a riveted rod arranged inside the elastic sleeve, the end of the riveted rod passes through the wider outer edge of the top of the sealing gasket and is riveted to the top cover, and the connection between the sealing gasket and the top cover is bonded by glue.
[0015] As a preferred solution of the concrete pole top sealing device described in the present invention, the spiral support member includes a spiral strip arranged inside the elastic sleeve, the middle of the spiral strip is hollow and is equipped with a telescopic spring, a pull rope is installed at the end of the telescopic spring, and the pull rope passes through the entire spiral strip and extends to the outside.
[0016] As a preferred solution of the concrete pole top sealing device described in the present invention, the spiral strip is folded spirally to form a cylindrical shape to support the elastic sleeve, and at the same time, the spiral strip is limited by the grooves and blocks on the spiral strip for sliding up and down.
[0017] As a preferred solution of the concrete pole top plugging device of the present invention, the spiral strip is spirally folded into a cylindrical shape and then punched into a fixed block to reduce lateral slippage and increase the firmness of the connection.
[0018] Beneficial effects of the present invention: The present invention realizes the rapid lifting and precise positioning of the plugging assembly by adopting an unmanned aerial vehicle or other lifting equipment and an improved grab hook design, avoiding the cumbersome process of traditional manual climbing of concrete poles for plugging. The design of the spiral support and the elastic sleeve can quickly adapt to concrete poles of different diameters, simplifying the plugging operation process. The plugging device of the present invention can be assembled and placed on the ground, without the need for workers to directly climb the concrete poles for high-altitude operations, greatly reducing the labor intensity and operation risks. By setting a buzzer light as a warning device, the operator can be reminded whether the plugging device is firmly fixed, further ensuring the safety of the operation. The stainless steel top cover is treated with reflective treatment, which not only enhances the waterproof, wear-resistant and temperature-resistant properties, but also reflects light in the sun for easy identification and positioning. The combination of the elastic sleeve and the spiral support ensures that the plugging device can fit tightly to the top of the concrete pole, effectively preventing rainwater from penetrating and the device from falling off due to strong winds, and improving the durability and reliability of the plugging effect. Compared with the traditional cement plugging method, the plugging device of the present invention reduces material consumption and labor costs, has strong reusability, and reduces the overall construction cost. The design is simple and easy to disassemble and maintain, which reduces the workload and cost of subsequent maintenance. In summary, the present invention not only solves many problems existing in traditional plugging methods, but also greatly improves work efficiency, operation safety and plugging quality, while reducing construction costs, and has obvious economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without any creative labor.
[0020] Figure 1 It is an overall schematic diagram of Example 1 of a concrete pole top sealing device.
[0021] Figure 2 It is an overall schematic diagram of Example 2 of a concrete pole top sealing device.
[0022] Figure 3 The present invention is a schematic diagram of the disassembled structure of the lifting component and the sealing component of a concrete pole top sealing device.
[0023] Figure 4The present invention is a schematic diagram of the structure of a spiral support member of a concrete pole top sealing device.
[0024] Figure 5 for Figure 4 Enlarged view of point A in .
[0025] Figure 6 The present invention is a schematic diagram of the cross-sectional structure of a spiral strip of a concrete pole top sealing device.
[0026] Figure 7 The present invention is a schematic diagram of the cross-sectional structure of a sealing gasket of a concrete pole top plugging device.
[0027] Reference numerals:
[0028] 100, lifting assembly; 101, mounting plate; 102, fixing plate; 103, grab hook; 104, limit slot; 105, pressing plate; 106, buzzer;
[0029] 200, plugging assembly; 201, top cover; 202, connector; 203, elastic sleeve; 204, spiral support; 205, concrete rod;
[0030] 202a, sealing gasket; 202b, riveting rod;
[0031] 204a, spiral strip; 204b, telescopic spring; 204c, draw cord; 204d, slot; 204e, block; 204f, fixed block. DETAILED DESCRIPTION
[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.
[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.
[0035] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.
[0036] Example 1, reference Figure 1 , which is the first embodiment of the present invention, provides a concrete pole top plugging device, including, a component designed for plugging the top of a concrete pole 205, including a hoisting component 100. The hoisting component 100 is composed of a mounting plate 101 and a fixing plate 102 fixed thereon, and a grab hook 103 is provided at the top of the fixing plate 102 for use with a drone or other lifting equipment to lift the plugging device to a designated concrete pole top position.
[0037] Specifically, the hoisting assembly 100 includes a mounting plate 101 and a fixing plate 102 disposed at the top of the mounting plate 101. The mounting plate 101 is used to connect with the bottom plugging device, and the top of the fixing plate 102 is provided with a grab hook 103 for hoisting the plugging device. The core of the plugging device lies in its designed stainless steel top cover 201 and anti-plugging assembly 200. The stainless steel top cover 201 is treated with reflective treatment, which is not only waterproof, wear-resistant, and temperature-resistant, but also reflects light in the sun, which is helpful for identification and positioning. The anti-aging spiral support 204 is equipped with a spring lining inside, so that the device can be contracted and adjusted by pulling the rope 204c to adapt to concrete poles 205 of different diameters.
[0038] Operation process: Make sure all components are intact and check whether the pull rope 204c is firmly connected to the spiral support 204. Connect the mounting plate 101 of the hoisting assembly 100 to the top cover 201, and the grab hook 103 on the fixed plate 102 is used to connect with the hoisting equipment. Use a drone or other hoisting tool to lift the entire plugging device to the top of the target concrete pole 205 through the grab hook 103 on the fixed plate 102. When the plugging device reaches the specified position, use a drone or other means to put the device on the top of the concrete pole 205 and ensure that the position is correct. Pull out the pull rope 204c from the ground until the elastic sleeve 203 is close to the surface of the concrete pole 205, and continue to pull the pull rope 204c until the spiral support 204 automatically falls off. At this time, the plugging device is firmly fixed to the top of the concrete pole 205. Check whether the plugging device fits tightly on the top of the concrete pole 205 to ensure a good plugging effect and prevent rainwater from seeping in and the device from falling off due to strong winds.
[0039] Through the above steps, the operator can complete the placement and fixing of the plugging device on the ground without having to climb high, which not only improves work efficiency but also ensures the safety of the operator.
[0040] Example 2, reference Figure 1 to Figure 3 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: on the basis of the first embodiment, the detailed design of the grab hook 103 is added, aiming to reduce the shaking when the drone is used for hoisting through the positioning function of the grab hook 103, and improve the positioning accuracy of the blocking assembly 200. In addition, a buzzer light 106 is added as a warning device.
[0041] Specifically, the grab hooks 103 are symmetrically arranged with respect to the central axis of the fixing plate 102, and a limiting groove 104 is formed at the top end between the two grab hooks 103 for positioning, and the two grab hooks 103 are arranged in an arc shape, and the grab hooks 103 are symmetrically distributed with respect to the central axis of the fixing plate 102, and a limiting groove 104 is formed at the top end between the two grab hooks for a more stable connection with a drone or other lifting equipment.
[0042] Furthermore, a pressing plate 105 is installed at the bottom end of the grab hook 103, one end of the pressing plate 105 is connected to the fixed plate 102, and the pressing plate 105 is arranged in an arc shape. The grab hook 103 and the pressing plate 105 are both designed in an arc shape, which can better adapt to the shape of the lifting equipment and reduce the shaking caused by factors such as wind during the lifting process. The pressing plate 105 is installed at the bottom end of the grab hook 103 and connected to the fixed plate 102. Its arc design helps to increase the stability of contact with the lifting equipment.
[0043] Furthermore, the lifting assembly 100 also includes a buzzer light 106 arranged at the top of the mounting plate 101, the buzzer light 106 is located between the threaded rods, and the downward pressure angle of the pressing plate 105 corresponds to the buzzer light 106 to warn the user that the grip is firm. The buzzer light 106 is arranged at the top of the mounting plate 101, located between the threaded rods. When the drone is connected to the grappling hook 103, when the downward pressure on the pressing plate 105 reaches a certain angle, the buzzer light 106 starts, prompting the user that the grip is firm and reliable.
[0044] The rest of the structure is the same as that of Example 1.
[0045] Operation process: Confirm that all components are intact, especially check whether the pull rope 204c is firmly connected to the spiral support 204. Check whether the limit slot 104 of the grab hook 103 is clean and free of foreign matter to ensure that the lifting equipment can be smoothly clamped. Test whether the buzzer 106 is working properly. Connect the mounting plate 101 of the lifting assembly 100 to the stainless steel top cover 201. Use the pressing plate 105 to ensure that the connection between the grab hook 103 and the fixing plate 102 is firm. Connect the drone or other lifting equipment to the limit slot 104 of the grab hook 103. Observe whether the buzzer 106 is turned on to confirm whether the grasping is firm. If the buzzer 106 is on, it means that the grasping is in place; if it is not on, it needs to be readjusted until the buzzer 106 is turned on.
[0046] Positioning stage: Use a drone or other lifting tool to lift the entire plugging device to the top of the target concrete pole 205. When the plugging device approaches the specified position, pay attention to its stability to ensure that it does not deviate from the target position due to shaking. When the plugging device reaches the specified position, use a drone or other means to accurately sleeve the device on the top of the concrete pole 205. Pull out the pull rope 204c from the ground until the elastic sleeve 203 is close to the surface of the concrete pole 205, and continue to pull the pull rope 204c until the spiral support 204 automatically falls off. Check whether the plugging device fits tightly on the top of the concrete pole 205 to ensure a good plugging effect and prevent rainwater from seeping in and the device from falling off due to strong winds. Through these improvement measures and operating steps, the shaking of the plugging assembly 200 during the lifting process can be effectively reduced, the positioning accuracy can be improved, and the safety and reliability of the lifting can be ensured through the warning function of the buzzer light 106.
[0047] Example 3, reference Figure 2 to Figure 7 , which is the third embodiment of the present invention, is different from the above embodiments in that: the design of the plugging assembly 200 is further improved, a specific plugging mechanism is provided, including a top cover 201, a connector 202, an elastic sleeve 203, a spiral support 204, etc., and how these components work together to ensure the plugging effect is described in detail. In particular, the shape of the elastic sleeve 203 is maintained by the design of the spiral support 204, and the state of the spiral support 204 is adjusted to adapt to concrete rods 205 of different diameters.
[0048] Specifically, the sealing assembly 200 includes a top cover 201 which is connected to the bottom of the mounting plate 101 through a threaded rod. The bottom of the top cover 201 is connected to the elastic sleeve 203 through a connector 202. A spiral support 204 is installed inside the elastic sleeve 203. The spiral support 204 can support the expansion force generated by the elastic sleeve 203, so that the spiral support 204 maintains a cylindrical shape to facilitate the later wrapping of the concrete rod 205.
[0049] Furthermore, the top cover 201 is made of stainless steel, which has high corrosion resistance and strength and is suitable for long-term outdoor use.
[0050] Furthermore, the connecting piece 202 includes a sealing gasket 202a arranged between the elastic sleeve 203 and the top cover 201, the sealing gasket 202a is arranged in an "I-shape", and a limiting groove is formed between the sealing gaskets 202a to be squeezed on the top end of the elastic sleeve 203, wherein the sealing gasket 202a is "I-shaped" to form a limiting groove to fix the top end of the elastic sleeve 203, and the rivet rod 202b passes through the sealing gasket 202a and is riveted to the top cover 201 to enhance the stability of the overall structure.
[0051] Furthermore, the connecting piece 202 also includes a rivet rod 202b arranged inside the elastic sleeve 203, and the end of the rivet rod 202b passes through the wider outer edge of the top of the sealing gasket 202a and is riveted to the top cover 201. The connection between the sealing gasket 202a and the top cover 201 is bonded by glue, and has a certain elasticity and deformation ability, and can fit tightly with concrete rods 205 of different diameters.
[0052] Furthermore, the spiral support 204 includes a spiral strip 204a arranged inside the elastic sleeve 203. The middle of the spiral strip 204a is hollow and is equipped with a telescopic spring 204b. A pull rope 204c is installed at the end of the telescopic spring 204b. The pull rope 204c passes through the entire spiral strip 204a and extends to the outside.
[0053] Furthermore, the spiral strip 204a is folded into a cylindrical shape to support the elastic sleeve 203. While supporting, the spiral strip 204a is limited by the groove 204d and the block 204e on the spiral strip 204a for sliding up and down.
[0054] Furthermore, the spiral strip 204a is folded into a cylindrical shape and then stamped into a fixed block 204f to reduce lateral slippage and increase the firmness of the connection. The spiral strip 204a is folded into a cylindrical support elastic sleeve 203, and the upper and lower sliding limits are achieved through the clamping groove 204d and the clamping block 204e. The fixed block 204f is formed by stamping to reduce lateral slippage and enhance the firmness of the connection.
[0055] The rest of the structure is the same as that of Example 2.
[0056] Operation process: Connect the top cover 201 to the bottom end of the mounting plate 101 through a threaded rod. Place the sealing gasket 202a in the connector 202 between the top cover 201 and the elastic sleeve 203, and fix it through the riveting rod 202b to ensure that the sealing gasket 202a and the top cover 201 are adhered by glue. Install the spiral support 204 inside the elastic sleeve 203, including the spiral strip 204a and the telescopic spring 204b inside it. Ensure that the spiral strip 204a is formed into a cylindrical shape by spiral folding to support the elastic sleeve 203, wherein the telescopic spring 204b can increase the supporting force of the spiral strip 204a. Fix one end of the pull rope 204c to the end of the telescopic spring 204b, and use a drone or other lifting equipment to lift the plugging assembly to the top of the target concrete pole 205 through the grab hook 103. Ensure that the plugging assembly is in the correct position to avoid displacement during the lifting process. When the plugging assembly reaches the designated position, the device is placed on the top of the concrete rod 205 by drone or other means. Pull the pull rope 204c from the ground to change the spiral support 204 from a cylindrical shape to a strip shape, and the elastic sleeve 203 shrinks after lacking support to adapt to the concrete rods 205 of different diameters. Continue to pull the pull rope 204c until the elastic sleeve 203 is close to the surface of the concrete rod 205, and when the spiral strip 204a and the telescopic spring 204b support the elastic sleeve 203, its card slot 204d and card block 204e limit to prevent the pressure from sliding up and down, and the point-shaped fixed block 204f produced by stamping can reduce lateral slippage and make the overall connection more stable. When the pull rope 204c is pulled, since it is pulled from the inside, the card slot 204d and the card block 204e will not limit the pulling, and the pulling force is greater than the fixed block 204f connected by stamping. At this time, the plugging device is firmly fixed on the top of the concrete pole 205. Check whether the plugging device is tightly fitted on the top of the concrete pole 205 to ensure a good plugging effect and prevent rainwater from seeping in and the device from falling off due to strong winds. Through the above design and operation steps, the rapid plugging of the top of the concrete pole can be effectively achieved to ensure the stability and reliability of the device.
[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.
Claims
1. A concrete pole top plugging device, characterized in that: include, A hoisting assembly (100) comprises a mounting plate (101), and a fixing plate (102) arranged at the top of the mounting plate (101), wherein the mounting plate (101) is used to be connected to a bottom plugging device, and a grab hook (103) for hoisting the plugging device is arranged at the top of the fixing plate (102); and, The plugging assembly (200) comprises a plug arranged at the bottom end of the mounting plate (101) and connected to the top cover (201) via a threaded rod, the bottom end of the top cover (201) is connected to the elastic sleeve (203) via a connector (202), a spiral support member (204) is installed inside the elastic sleeve (203), and the spiral support member (204) can support the expansion force generated by the elastic sleeve (203), so that the spiral support member (204) maintains a cylindrical shape to facilitate the subsequent wrapping of the concrete rod (205).
2. The concrete pole top plugging device according to claim 1, characterized in that: The grab hooks (103) are symmetrically arranged with respect to the central axis of the fixing plate (102); a limiting groove (104) is formed at the top end between the two grab hooks (103) for positioning; and the two grab hooks (103) are arranged in an arc shape.
3. The concrete pole top blocking device according to claim 2, characterized in that: A pressing plate (105) is installed at the bottom end of the grab hook (103), one end of the pressing plate (105) is connected to the fixing plate (102), and the pressing plate (105) is arranged in an arc shape.
4. The concrete pole top blocking device according to claim 3, characterized in that: The hanging assembly (100) further comprises a buzzer light (106) arranged at the top of the mounting plate (101), the buzzer light (106) being located between the threaded rods, and the downward pressing angle of the pressing plate (105) corresponding to the buzzer light (106) is used to warn the user to hold the device firmly.
5. The concrete pole top blocking device according to claim 4, characterized in that: The top cover (201) is made of stainless steel.
6. The concrete pole top blocking device according to claim 5, characterized in that: The connecting piece (202) comprises a sealing gasket (202a) arranged between the elastic sleeve (203) and the top cover (201); the sealing gasket (202a) is arranged in an "I" shape, and a limiting groove is formed between the sealing gaskets (202a) to be squeezed on the top end of the elastic sleeve (203).
7. The concrete pole top blocking device according to claim 6, characterized in that: The connecting piece (202) further comprises a rivet rod (202b) arranged inside the elastic sleeve (203), the end of the rivet rod (202b) passes through the wider outer edge of the top of the sealing gasket (202a) and is riveted to the top cover (201), and the connection between the sealing gasket (202a) and the top cover (201) is bonded by glue.
8. The concrete pole top blocking device according to claim 7, characterized in that: The spiral support member (204) comprises a spiral strip (204a) arranged inside the elastic sleeve (203); the middle of the spiral strip (204a) is hollow and is provided with a telescopic spring (204b); a pull rope (204c) is installed at the end of the telescopic spring (204b); and the pull rope (204c) passes through the entire spiral strip (204a) and extends to the outside.
9. The concrete pole top blocking device according to claim 8, characterized in that: The spiral strip (204a) is formed into a cylindrical shape by spiral folding to support the elastic sleeve (203). While supporting, the spiral strip (204a) is limited by the clamping groove (204d) and the clamping block (204e) on the spiral strip (204a) for sliding up and down.
10. The concrete pole top blocking device according to claim 9, characterized in that: The spiral strip (204a) is spirally folded into a cylindrical shape and then punched into a fixing block (204f) to reduce lateral slippage and increase the firmness of the connection.
Citation Information
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