Quick repair sleeve for concrete pole

Abstract

The utility model relates to the technical field of cement electric poles, in particular to a cement electric pole rapid repairing sleeve which comprises an electric pole and repairing sleeve assemblies which are sequentially connected end to end and arranged on the outer side of the electric pole in a sleeving mode. Two first strip-shaped vertical plates are arranged on the outer wall of the first semicircular sleeve, two second strip-shaped vertical plates are arranged on the outer wall of the second semicircular sleeve, and locking pieces are arranged on the left sides of the two first strip-shaped vertical plates. According to the rapid repairing sleeve for the concrete pole, the two first strip-shaped vertical plates and the two second strip-shaped vertical plates are fixed through the two locking pieces, and butt joint of the first semicircular sleeve and the second semicircular sleeve is achieved; according to the connecting mode, when the first semicircular sleeve and the second semicircular sleeve are in butt joint, a worker only needs to rotate the rotating shafts of the two locking pieces, and the efficiency of repairing the concrete pole by the worker is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cement poles, in particular to a cement pole quick repair sleeve. Background Art

[0002] The service life of cement poles is 30 years or more. After long-term use, cement poles will have longitudinal cracks, transverse fractures and serious damage. For damaged cement poles, the method of replacing the pole as a whole is generally adopted. However, due to the influence of various external factors in the real environment, such as cement poles placed in residential areas with small open spaces or on the sides of busy streets, or cement poles installed in farmland and hilly areas in the wild, it is difficult for dismantling vehicles to reach them. If the damaged cement poles in these areas are to be replaced as a whole, it will not only cause a long power outage, but also make the construction more difficult, and it is very likely that a large amount of outsourcing compensation will be paid. The commonly used treatment methods are to support the stress points with support rods or to reinforce the cracks with clamps. These two methods have limited treatment capabilities and often cause re-damage after treatment.

[0003] The patent with publication number CN217631464U discloses a reinforcement mold for repairing damaged cement utility poles, including a mold sleeve connected end to end in sequence and sleeved on the lower part of the utility pole, the bottom of the bottom mold sleeve extends into the foundation pit of the utility pole, and the mold sleeve includes a pair of split semicircular templates, the top, bottom and side walls of the split semicircular template are respectively provided with an upper flange, a lower flange and a side flange, and the upper flange, lower flange and side flange are provided with upper bolt holes, lower bolt holes and side bolt holes for bolt connection; the utility model utilizes multiple groups of split semicircular templates to connect into a mold sleeve connected up and down, and the mold sleeve is sleeved on the lower part of the utility pole to extend to the bottom foundation pit to facilitate cement grouting, thereby achieving the purpose of repairing and reinforcing the cement utility pole, with good repair effect, reduced repair cost, and increased service life of the cement utility pole.

[0004] In the specific use of the above-mentioned prior art, the two split semicircular templates of the mold sleeve need to be fixed with a large number of bolts when they are connected, which is not conducive to the construction workers to quickly repair the cement pole. In view of this, we propose a cement pole quick repair sleeve. Utility Model Content

[0005] The utility model aims to provide a cement pole quick repair sleeve to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A cement pole quick repair sleeve comprises a pole and a repair sleeve assembly connected end to end and sleeved on the outside of the pole, wherein the repair sleeve assembly comprises a first semicircular sleeve and a second semicircular sleeve which are arranged symmetrically, the first semicircular sleeve and the second semicircular sleeve are arranged symmetrically, and the inner walls of the first semicircular sleeve and the second semicircular sleeve fit the outer wall of the pole, so as to cover the damaged position of the pole and strengthen the strength of the pole, thereby achieving the repair of the pole;

[0008] Two first strip vertical plates symmetrically arranged front to back are provided on the outer wall of the first semicircular sleeve and located at the right edge, and rectangular holes are provided on the right sides of the two first strip vertical plates and near the upper and lower ends, and two second strip vertical plates symmetrically arranged front to back are provided on the outer wall of the second semicircular sleeve and located at the left edge, and rectangular positioning blocks are provided on the left sides of the two second strip vertical plates and near the upper and lower ends, and rectangular insertion holes are provided on the tops of the rectangular positioning blocks, and the four rectangular positioning blocks pass through the four rectangular holes respectively, so that the two first strip vertical plates are respectively connected to the two second strip vertical plates;

[0009] The left sides of the two first vertical strips are provided with locking pieces, and the locking pieces include two rectangular solid blocks which are symmetrically arranged up and down, and the two rectangular solid blocks are connected to a rotating shaft for rotation together, and the top and bottom ends of the rotating shaft are connected to threaded rods, and the outer sides of the threaded rods are threadedly connected to a rectangular plug block, and the rectangular plug block passes through the rectangular insertion hole, and the two threaded rods are driven to rotate synchronously through the rotating shaft, and the two threaded rods respectively drive the two rectangular plug blocks to move synchronously, and the two rectangular plug blocks move synchronously relative to each other or move synchronously in the opposite direction. When the two rectangular plug blocks move synchronously in the opposite direction, the opposite ends of the two rectangular plug blocks pass through the corresponding two rectangular insertion holes respectively, thereby fixing the positions of the two rectangular positioning blocks on the second vertical strip, and then fixing the positions of the first vertical strip and the second vertical strip, and realizing the docking of the first semicircular sleeve and the second semicircular sleeve. This connection method only requires the staff to rotate the rotating shafts of the two locking pieces when docking the first semicircular sleeve and the second semicircular sleeve, effectively improving the efficiency of the staff in repairing cement poles.

[0010] Preferably, the right sides of the two rectangular solid blocks are fixedly connected to the left side of the first strip vertical plate, so that the position of the rectangular solid blocks is fixed, thereby fixing the locking member on the left side of the first strip vertical plate, and the top and bottom ends of the rotating shaft pass through the opposite sides of the two rectangular solid blocks respectively, and a bearing is provided at the connection between the rotating shaft and the rectangular solid block, which is conducive to the rotation of the rotating shaft relative to the rectangular solid block.

[0011] Preferably, a knob is provided in the middle of the outer wall of the rotating shaft, and the outer wall of the knob is provided with a plurality of U-shaped finger grooves arranged in a circular array, so that the staff can drive the rotating shaft to rotate by turning the knob.

[0012] Preferably, the right side of the rectangular plug is in contact with the left side of the first strip vertical plate, so that the rectangular plug is stably driven up and down by the threaded rod. When the rectangular plug passes through the rectangular plug hole, the threaded rod is located in the thread groove of the rectangular plug, the length of the thread groove is greater than the length of the threaded rod, and the diameter of the rotating shaft is smaller than the diameter of the threaded rod, so that the threaded rod is always located in the thread groove of the rectangular plug, avoiding dust from adhering to the threaded rod.

[0013] Preferably, a connecting top plate is provided at the top of the left side of the first strip vertical plate, and a connecting top plate is provided at the top of the right side of the second strip vertical plate. A circular hole a is provided at the top of the connecting top plate for connecting two adjacent repair sleeve assemblies above and below.

[0014] Preferably, a connecting bottom plate is provided at the bottom of the left side of the first strip vertical plate, and a connecting bottom plate is provided at the bottom of the right side of the second strip vertical plate. A circular hole b is provided at the top of the connecting bottom plate. The upper and lower adjacent connecting top plates and connecting bottom plates are connected by an insertion rod. The bottom end of the insertion rod passes through the circular hole b and the circular hole a in turn. An anti-drop cap is provided at the top of the insertion rod. The bottom of the anti-drop cap fits with the top of the connecting bottom plate to fix the position of the insertion rod. The relative positions of the connecting top plate and the connecting bottom plate are fixed by the insertion rod, thereby fixing the relative positions of the two upper and lower adjacent repair sleeve assemblies.

[0015] Preferably, the top and bottom of the outer wall of the first semicircular sleeve are provided with a first semicircular convex plate, and the outer wall of the first semicircular sleeve is provided with a plurality of equidistantly arranged first reinforcement strips, and the plurality of first reinforcement strips are located between two first semicircular sleeves to improve the strength of the first semicircular sleeve.

[0016] Preferably, the top and bottom of the outer wall of the second semicircular sleeve are provided with second semicircular convex plates, and the outer wall of the second semicircular sleeve is provided with a plurality of equally spaced second reinforcement strips, and the plurality of second reinforcement strips are located between the two second semicircular sleeves to improve the strength of the second semicircular sleeves.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. The cement pole quick repair sleeve drives two threaded rods to rotate synchronously through a rotating shaft, and the two threaded rods respectively drive two rectangular plug blocks to move synchronously, and the two rectangular plug blocks move synchronously relative to each other or move synchronously in the opposite direction. When the two rectangular plug blocks move synchronously in the opposite direction, the opposite ends of the two rectangular plug blocks pass through the two corresponding rectangular plug holes respectively, thereby fixing the positions of the two rectangular positioning blocks on the second strip vertical plate, and then fixing the positions of the first strip vertical plate and the second strip vertical plate, realizing the docking of the first semicircular sleeve and the second semicircular sleeve. This connection method only requires the staff to rotate the rotating shafts of the two locking pieces when docking the first semicircular sleeve and the second semicircular sleeve, effectively improving the efficiency of the staff in repairing the cement pole.

[0019] 2. The cement pole quick repair sleeve, the first semicircular sleeve and the second semicircular sleeve are arranged symmetrically after docking, and the inner walls of the first semicircular sleeve and the second semicircular sleeve are in contact with the outer wall of the pole, which can cover the damaged position of the pole and strengthen the strength of the pole, thereby realizing the repair of the pole.

[0020] 3. The bottom of the anti-drop cap of the cement pole quick repair sleeve fits with the top of the connecting bottom plate to fix the position of the inserted rod. The relative positions of the connecting top plate and the connecting bottom plate are fixed by the inserted rod, thereby fixing the relative positions of the two adjacent repair sleeve assemblies above and below.

[0021] 4. The cement pole quick repair sleeve, the two first semicircular convex plates and multiple first reinforcement strips on the outer wall of the first semicircular sleeve can improve the strength of the first semicircular sleeve, and the two second semicircular convex plates and multiple second reinforcement strips on the outer wall of the second semicircular sleeve can improve the strength of the second semicircular sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is a schematic diagram of the assembly structure of the repair sleeve assembly in the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the repair sleeve assembly in the utility model;

[0025] Figure 4 This is one of the partial structural schematic diagrams of the repair sleeve assembly in the utility model;

[0026] Figure 5 This is the second partial structural schematic diagram of the repair sleeve assembly in the utility model;

[0027] Figure 6This is the third partial structural schematic diagram of the repair sleeve assembly in the utility model.

[0028] In the figure: 1. electric pole; 2. repair sleeve assembly; 20. first semicircular sleeve; 200. first semicircular convex plate; 201. first reinforcing strip; 21. second semicircular sleeve; 210. second semicircular convex plate; 211. second reinforcing strip; 22. first strip vertical plate; 220. rectangular hole; 23. second strip vertical plate; 24. rectangular positioning block; 240. rectangular plug-in hole; 25. connecting top plate; 250. circular hole a; 26. connecting bottom plate; 260. circular hole b; 27. locking piece; 270. rectangular solid block; 271. rotating shaft; 272. threaded rod; 273. rectangular plug-in block; 274. knob; 3. plug-in rod; 30. anti-drop cap. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] See also Figure 1-Figure 6 , the utility model provides a technical solution:

[0032] A cement pole quick repair sleeve comprises a pole 1, and a repair sleeve assembly 2 which is connected end to end and sleeved on the outside of the pole 1, wherein the repair sleeve assembly 2 comprises a first semicircular sleeve 20 and a second semicircular sleeve 21 which are arranged symmetrically, and the first semicircular sleeve 20 and the second semicircular sleeve 21 are arranged symmetrically, and the inner walls of the first semicircular sleeve 20 and the second semicircular sleeve 21 are fitted with the outer wall of the pole 1, so that the damaged position of the pole 1 can be covered and the strength of the pole 1 can be strengthened, thereby realizing the repair function of the pole 1;

[0033] Two first strip vertical plates 22 are symmetrically arranged front and back on the outer wall of the first semicircular sleeve 20 and located at the right edge. Rectangular holes 220 are provided on the right sides of the two first strip vertical plates 22 and near the upper and lower ends. Two second strip vertical plates 23 are symmetrically arranged front and back on the outer wall of the second semicircular sleeve 21 and located at the left edge. Rectangular positioning blocks 24 are provided on the left sides of the two second strip vertical plates 23 and near the upper and lower ends. Rectangular insertion holes 240 are provided on the tops of the rectangular positioning blocks 24. The four rectangular positioning blocks 24 pass through the four rectangular holes 220 respectively, so that the two first strip vertical plates 22 are connected to the two second strip vertical plates 23 respectively.

[0034] The left sides of the two first strip-shaped vertical plates 22 are each provided with a locking member 27, and the locking member 27 includes two rectangular solid blocks 270 symmetrically arranged in an upper and lower manner, and the two rectangular solid blocks 270 are connected to a rotating shaft 271 for rotation together, and the top and bottom ends of the rotating shaft 271 are connected to threaded rods 272, and the outer side of the threaded rods 272 is threadedly connected to a rectangular plug block 273, and the rectangular plug block 273 passes through the rectangular insertion hole 240, and the two threaded rods 272 are driven to rotate synchronously through the rotating shaft 271, and the two threaded rods 272 respectively drive the two rectangular plug blocks 273 to move synchronously, and the two rectangular plug blocks 273 move synchronously relative to each other or move synchronously in the opposite direction. When the two rectangular plug blocks 273 move synchronously in opposite directions, the opposite ends of the two rectangular plug blocks 273 pass through the corresponding two rectangular plug holes 240 respectively, thereby fixing the positions of the two rectangular positioning blocks 24 on the second strip vertical plate 23, and then fixing the positions of the first strip vertical plate 22 and the second strip vertical plate 23, thereby realizing the docking of the first semicircular sleeve 20 and the second semicircular sleeve 21. This connection method only requires the staff to rotate the rotating shafts 271 of the two locking pieces 27 when docking the first semicircular sleeve 20 and the second semicircular sleeve 21, thereby effectively improving the efficiency of the staff in repairing the cement poles.

[0035] In this embodiment, the right sides of the two rectangular solid blocks 270 are fixedly connected to the left side of the first strip vertical plate 22, so that the position of the rectangular solid block 270 is fixed, so that the locking member 27 is fixed to the left side of the first strip vertical plate 22, and the top and bottom ends of the rotating shaft 271 pass through the opposite sides of the two rectangular solid blocks 270 respectively, and a bearing is provided at the connection between the rotating shaft 271 and the rectangular solid block 270, which is conducive to the rotation of the rotating shaft 271 relative to the rectangular solid block 270.

[0036] Specifically, a knob 274 is provided in the middle of the outer wall of the rotating shaft 271 , and a plurality of U-shaped finger grooves arranged in a circular array are provided on the outer wall of the knob 274 , so that the staff can drive the rotating shaft 271 to rotate by means of the knob 274 .

[0037] Furthermore, the right side of the rectangular plug 273 fits with the left side of the first strip vertical plate 22, so that the rectangular plug 273 is stably driven up and down by the threaded rod 272. When the rectangular plug 273 passes through the rectangular plug hole 240, the threaded rod 272 is located in the thread groove of the rectangular plug 273. The length of the thread groove is greater than the length of the threaded rod 272. The diameter of the rotating shaft 271 is smaller than the diameter of the threaded rod 272, so that the threaded rod 272 is always located in the thread groove of the rectangular plug 273, avoiding dust from adhering to the threaded rod 272.

[0038] Furthermore, a connecting top plate 25 is provided at the top of the left side of the first strip vertical plate 22, and a connecting top plate 25 is provided at the top of the right side of the second strip vertical plate 23. A circular hole a250 is opened at the top of the connecting top plate 25 for connecting two adjacent repair sleeve assemblies 2 above and below.

[0039] Furthermore, a connecting bottom plate 26 is provided at the bottom of the left side of the first strip vertical plate 22, and a connecting bottom plate 26 is provided at the bottom of the right side of the second strip vertical plate 23. A circular hole b260 is provided at the top of the connecting bottom plate 26. The upper and lower adjacent connecting top plates 25 and connecting bottom plates 26 are connected by an insert rod 3. The bottom end of the insert rod 3 passes through the circular hole b260 and the circular hole a250 in turn. An anti-drop cap 30 is provided at the top of the insert rod 3. The bottom of the anti-drop cap 30 fits with the top of the connecting bottom plate 26 to fix the position of the insert rod 3. The relative position of the connecting top plate 25 and the connecting bottom plate 26 is fixed by the insert rod 3, thereby fixing the relative position of the two upper and lower adjacent repair sleeve assemblies 2.

[0040] Furthermore, the top and bottom of the outer wall of the first semicircular sleeve 20 are provided with a first semicircular convex plate 200, and the outer wall of the first semicircular sleeve 20 is provided with a plurality of equidistantly arranged first reinforcement strips 201, and the plurality of first reinforcement strips 201 are located between the two first semicircular sleeves 20 to improve the strength of the first semicircular sleeve 20.

[0041] Furthermore, the top and bottom of the outer wall of the second semicircular sleeve 21 are provided with second semicircular convex plates 210, and the outer wall of the second semicircular sleeve 21 is provided with multiple equidistantly arranged second reinforcement strips 211, and the multiple second reinforcement strips 211 are located between the two second semicircular sleeves 21 to improve the strength of the second semicircular sleeve 21.

[0042] When the cement pole quick repair sleeve of this embodiment is in use, the staff puts the repair sleeve assembly 2 on the outer wall of the pole 1, and two staff members respectively hold the first semicircular sleeve 20 and the second semicircular sleeve 21, and move the first semicircular sleeve 20 and the second semicircular sleeve 21 relative to each other, so that the four rectangular positioning blocks 24 pass through the four rectangular holes 220 respectively, until the two first strip vertical plates 22 are respectively fitted with the two second strip vertical plates 23. At this time, the staff holding the first semicircular sleeve 20 turns the knobs 274 of the two locking members 27 by hand, so that the knobs 274 drive the rotating shaft 271 to rotate, so that the rotating shaft 271 drives the two threaded rods 272 to rotate, so that the two threaded rods 272 respectively drive the two rectangular plug blocks 273 to move back to each other, and then the four rectangular plug blocks 273 in the two locking members 27 are respectively moved from The four rectangular insertion holes 240 are passed through to fix the positions of the four rectangular positioning blocks 24, so that the two first strip vertical plates 22 are respectively connected and fixed in position with the two second strip vertical plates 23, thereby realizing the installation of the first semicircular sleeve 20 and the second semicircular sleeve 21, and then the staff continues to install the remaining repair sleeve assemblies 2 according to the above operations. Finally, the staff passes the bottom end of the rod 3 through the upper and lower adjacent circular holes b260 and circular hole a250 in turn, and fixes the relative positions of the connecting top plate 25 and the connecting bottom plate 26 through the rod 3, thereby fixing the relative positions of the two upper and lower adjacent repair sleeve assemblies 2. Since the inner walls of the first semicircular sleeve 20 and the second semicircular sleeve 21 are in contact with the outer wall of the utility pole 1, the damaged position of the utility pole 1 can be covered and the strength of the utility pole 1 can be strengthened, thereby realizing the repair of the utility pole 1.

[0043] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A cement pole quick repair sleeve, comprising a pole (1), and a repair sleeve assembly (2) connected end to end and sleeved on the outside of the pole (1), characterized in that: The repair sleeve assembly (2) comprises a first semicircular sleeve (20) and a second semicircular sleeve (21) which are symmetrically arranged in the left and right directions. The outer wall of the first semicircular sleeve (20) is provided with two first strip vertical plates (22) which are symmetrically arranged in the front and back directions at the right edge. The right sides of the two first strip vertical plates (22) are provided with rectangular holes (220) near the upper and lower ends. The outer wall of the second semicircular sleeve (21) is provided with two second strip vertical plates (23) which are symmetrically arranged in the front and back directions at the left edge. The left sides of the two second strip vertical plates (23) are provided with rectangular positioning blocks (24) near the upper and lower ends. A rectangular insertion hole (240) is provided on the top of the rectangular positioning block (24), and the four rectangular positioning blocks (24) pass through the four rectangular holes (220) respectively. A locking piece (27) is provided on the left side of the two first strip vertical plates (22), and the locking piece (27) comprises two rectangular solid blocks (270) symmetrically arranged up and down. The two rectangular solid blocks (270) are rotatably connected to a rotating shaft (271) together. The top and bottom ends of the rotating shaft (271) are both connected to a threaded rod (272), and the outer side of the threaded rod (272) is threadedly connected to a rectangular insertion block (273), and the rectangular insertion block (273) passes through the rectangular insertion hole (240).

2. The cement pole quick repair sleeve according to claim 1 is characterized in that: The right sides of the two rectangular solid blocks (270) are fixedly connected to the left side of the first strip vertical plate (22), the top and bottom ends of the rotating shaft (271) pass through the opposite sides of the two rectangular solid blocks (270) respectively, and a bearing is provided at the connection between the rotating shaft (271) and the rectangular solid blocks (270).

3. The cement pole quick repair sleeve according to claim 1 is characterized in that: A knob (274) is provided in the middle of the outer wall of the rotating shaft (271), and a plurality of U-shaped finger grooves arranged in a circular array are provided on the outer wall of the knob (274).

4. The cement pole quick repair sleeve according to claim 1 is characterized in that: The right side of the rectangular plug block (273) fits with the left side of the first strip vertical plate (22); when the rectangular plug block (273) passes through the rectangular plug hole (240), the threaded rod (272) is located in the thread groove of the rectangular plug block (273); and the diameter of the rotating shaft (271) is smaller than the diameter of the threaded rod (272).

5. The cement pole quick repair sleeve according to claim 1 is characterized in that: A connecting top plate (25) is provided at the top of the left side of the first strip-shaped vertical plate (22), and a connecting top plate (25) is provided at the top of the right side of the second strip-shaped vertical plate (23). A circular hole a (250) is provided at the top of the connecting top plate (25).

6. The cement pole quick repair sleeve according to claim 5 is characterized in that: A connecting bottom plate (26) is provided at the bottom of the left side of the first strip vertical plate (22), and a connecting bottom plate (26) is provided at the bottom of the right side of the second strip vertical plate (23). A circular hole b (260) is provided at the top of the connecting bottom plate (26). The upper and lower adjacent connecting top plates (25) and connecting bottom plates (26) are connected by an insertion rod (3). The bottom end of the insertion rod (3) passes through the circular hole b (260) and the circular hole a (250) in sequence. An anti-drop cap (30) is provided at the top of the insertion rod (3).

7. The cement pole quick repair sleeve according to claim 1 is characterized in that: The top and bottom of the outer wall of the first semicircular sleeve (20) are both provided with first semicircular convex plates (200), and the outer wall of the first semicircular sleeve (20) is provided with a plurality of first reinforcement strips (201) arranged at equal intervals, and the plurality of first reinforcement strips (201) are located between two first semicircular sleeves (20).

8. The cement pole quick repair sleeve according to claim 1 is characterized by: The top and bottom of the outer wall of the second semicircular sleeve (21) are both provided with second semicircular convex plates (210), and the outer wall of the second semicircular sleeve (21) is provided with a plurality of second reinforcement strips (211) arranged at equal intervals, and the plurality of second reinforcement strips (211) are located between two second semicircular sleeves (21).

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