Connecting structure suitable for inner wall body, outer wall body, upper beam and lower beam

Abstract

The invention discloses a connecting structure suitable for inner and outer walls and upper and lower beams, and relates to the technical field of constructional engineering. A connecting structure suitable for inner and outer walls and upper and lower beams comprises an upper beam mechanism and a lower beam mechanism, a wallboard mechanism is arranged between the upper beam mechanism and the lower beam mechanism, the upper beam mechanism comprises an upper concrete beam, a first connecting assembly is installed on one side of the upper concrete beam, and the first connecting assembly comprises a groove plate; an expansion screw is arranged between the lower beam mechanism and the wallboard mechanism, two foaming ceramic partition boards are installed between the upper beam mechanism and the lower beam mechanism, and a gap is reserved between the two foaming ceramic partition boards. According to the connecting structure suitable for the inner wall body, the outer wall body, the upper beam and the lower beam, rapid splicing of the wallboard mechanism is achieved, the construction efficiency is improved, and the time cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and particularly to a connection structure applicable to the connection between internal and external walls and upper and lower beams. Background Art

[0002] In the application of building wall materials, traditional red bricks, aerated concrete bricks, and ALC wall panels have many defects. In terms of water absorption and moisture absorption, the water absorption rate and moisture absorption rate of these materials are generally high. When the external environmental humidity changes, the materials will expand after absorbing a large amount of water, and shrink in a dry environment. This repeated expansion and contraction process is extremely likely to cause wall cracking, which not only affects the aesthetics of the wall, but also reduces the structural strength of the wall. At the same time, the high moisture absorption rate makes the wall prone to mildew in a humid environment, breeding a large number of molds, which not only poses a threat to the health of residents, but also further erodes the wall materials, shortening the service life of the wall and seriously affecting the quality and durability of the house.

[0003] In the connection between the wall and the beam, the traditional wall and the cross beam lack effective connection points, and the connection method is relatively simple. During use, especially when subjected to external forces, the wall is prone to toppling, posing a large safety hazard. Moreover, the traditional construction method has a long construction period, and a large amount of dust, noise and other pollutions will be generated during the construction process, causing great damage to the environment and making it difficult to meet the requirements of modern architecture for high efficiency, environmental protection and high quality. Summary of the Invention

[0004] The present invention aims to provide an innovative modular wall connection structure, which has the characteristics of rapid installation, detachable and high stability. At the same time, combined with excellent performance foamed ceramic wall panels, it effectively solves the problems existing in traditional walls in terms of material performance, construction efficiency, maintenance difficulty and environmental protection, improves the overall quality and service life of the building, and creates a safer, more comfortable and environmentally friendly living environment for users.

[0005] To achieve the above object, the present invention provides the following technical solution: A connection structure applicable to the connection between internal and external walls and upper and lower beams, including an upper beam mechanism and a lower beam mechanism. A wall panel mechanism is arranged between the upper beam mechanism and the lower beam mechanism. The upper beam mechanism includes an upper concrete beam embedded in the outer wall. A first connection component is installed on one side of the upper concrete beam. The first connection component includes a groove plate fixedly embedded in the upper concrete beam. An expansion screw for fixing the lower beam mechanism and the wall panel mechanism is arranged between the lower beam mechanism and the wall panel mechanism. The wall panel mechanism includes a foamed ceramic partition wall panel. Two foamed ceramic partition wall panels are installed between the upper beam mechanism and the lower beam mechanism, and a gap is reserved between the two foamed ceramic partition wall panels. Polyurethane foam is filled in the gaps at the joints between the wall panel mechanism and the upper beam mechanism and the lower beam mechanism, as well as between two foamed ceramic partition panels.

[0006] As a preferred technical solution of the present invention, the upper inner wall of the upper concrete beam is evenly provided with first card slots at equal intervals; The upper surface of the groove plate is fixedly connected with first card columns that are evenly spaced and adapted to be inserted into the first card slots, and the outer ends of the first card columns inserted into the first card slots expand.

[0007] As a preferred technical solution of the present invention, the lower beam mechanism includes a lower concrete beam buried in the outer wall. The upper surface of the lower concrete beam is evenly provided with second card slots at equal intervals. On both sides of the upper surface of the lower concrete beam, inclined first installation holes are respectively provided, and the first installation holes are staggered with the second card slots; A second connection component is installed on the upper surface of the lower concrete beam.

[0008] As a preferred technical solution of the present invention, the second connection component includes a first plate fixedly connected to the lower concrete beam. The lower surface of the first plate is fixedly connected with second card columns that are evenly spaced and adapted to be inserted into the second card slots, and the outer ends of the second card columns inserted into the second card slots expand; On both sides of the upper surface of the first plate, second installation holes adapted to be docked with the first installation holes are respectively provided; In the middle of the upper surface of the second card column, a second plate is fixedly connected. On both ends of the upper surface of the second plate, receiving grooves are respectively provided.

[0009] As a preferred technical solution of the present invention, lifting mechanisms are respectively arranged at both ends of the second plate. The lifting mechanism includes a seam plate, and in the middle of the lower surface of the seam plate, a groove block adapted to be inserted into the receiving groove is fixedly connected; The seam plate is adapted to the gap at the joint between the wall panel mechanism and the lower beam mechanism.

[0010] As a preferred technical solution of the present invention, at one end of the foamed ceramic partition panel close to the upper beam mechanism, a first slot adapted to the groove plate is provided, and at one end of the foamed ceramic partition panel close to the lower beam mechanism, a second slot adapted to the second plate is provided; At one end of the foamed ceramic partition panel close to the lower beam mechanism, inclined third installation holes are evenly provided at equal intervals, and a reinforcing tube adapted to be inserted into and corresponding to the second installation hole is fixedly inserted in the third installation hole.

[0011] As a preferred technical solution of the present invention, a fiber layer sleeving an expansion screw is inserted and adapted in the first installation hole, the second installation hole, and the reinforcing tube, and the fiber layer fits the inner walls of the first installation hole, the second installation hole, and the reinforcing tube.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) A connection structure applicable to the connection of internal and external walls and upper and lower beams introduces an upper beam mechanism and a lower beam mechanism, making the connection structure modular. The rapid assembly of the wall panel mechanism is realized through the first connection component and the second connection component. Compared with the traditional construction method, the construction period is significantly shortened, the construction efficiency is improved, the time cost is reduced, and the impact on the surrounding environment during the construction process is reduced.

[0013] (2) A connection structure applicable to the connection of internal and external walls and upper and lower beams uses a fiber layer and expansion screws for connection, enhancing the integrity of the wall panel mechanism with the upper beam mechanism and the lower beam mechanism, and improving the stability of the building structure.

[0014] (3) A connection structure applicable to the connection of internal and external walls and upper and lower beams uses a fiber layer and expansion screws for connection, avoiding the exposure of the expansion screws, making the whole more beautiful, and meeting the dual pursuits of aesthetics and functionality in modern architecture.

[0015] (4) A connection structure applicable to the connection of internal and external walls and upper and lower beams optimizes the structural design, significantly improving the overall strength of the wall after installation, enhancing the water seepage prevention performance of the wall, effectively solving the problem of water leakage in traditional walls, and effectively improving the sound insulation effect, creating a quiet and comfortable indoor environment for the occupants.

[0016] (5) A connection structure applicable to the connection of internal and external walls and upper and lower beams selects a foamed ceramic partition board with the characteristics of non-water absorption, non-moisture absorption, non-cracking, non-deformation, and non-mildewing, fundamentally solving a series of problems caused by water absorption and moisture absorption of traditional wall materials. Its light weight reduces the floor load and improves the safety of the building structure.

[0017] (6) A connection structure applicable to the connection of internal and external walls and upper and lower beams selects a foamed ceramic partition board with sound insulation, heat insulation, and heat preservation properties, realizing energy conservation and environmental protection and improving the living comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic diagram of the upper beam mechanism of the present invention; Figure 3 is a schematic diagram of the lower beam mechanism of the present invention; Figure 4 is a schematic connection diagram of the lower beam mechanism of the present invention; Figure 5 is a schematic diagram of the wall panel mechanism of the present invention; Figure 6 is the present invention Figure 5 enlarged schematic diagram at A; Figure 7Schematic installation diagram of the wall panel machine of the present invention; Figure 8 Schematic position diagram of the lifting mechanism of the present invention; Figure 9 Schematic diagram of the lifting mechanism of the present invention; Figure 10 Schematic diagram of the fiber layer of the present invention.

[0019] In the figure: 1. Upper beam mechanism; 101. Upper concrete beam; 102. First card slot; 103. Groove plate; 104. First card post; 2. Lower beam mechanism; 201. Lower concrete beam; 202. Second card slot; 203. First installation hole; 204. First plate; 205. Second card post; 206. Second installation hole; 207. Second plate; 208. Connecting groove; 3. Wall panel mechanism; 301. Foamed ceramic partition wall panel; 302. First slot; 303. Second slot; 304. Third installation hole; 305. Reinforcing pipe; 4. Lifting mechanism; 401. Seam plate; 402. Groove block; 5. Fiber layer; 6. Expansion screw. Specific implementation mode

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0021] Embodiment: Please refer to Figure 1 , Figure 2 , Figure 5 , a connection structure suitable for connecting the inner and outer walls and the upper and lower beams, including an upper beam mechanism 1 and a lower beam mechanism 2. A wall panel mechanism 3 is arranged between the upper beam mechanism 1 and the lower beam mechanism 2. The upper beam mechanism 1 includes an upper concrete beam 101 embedded in the outer wall. A first connection component is installed on one side of the upper concrete beam 101. The first connection component includes a groove plate 103 fixedly embedded in the upper concrete beam 101. The groove plate 103 can be accurately clamped with the wall panel mechanism 3 to ensure the accuracy and stability of the installation; An expansion screw 6 for fixing the two is arranged between the lower beam mechanism 2 and the wall panel mechanism 3. The expansion screw 6 is used for fixing. This fixing method is simple to operate and has strong fastening force, further improving the connection stability. At the same time, it is convenient for the disassembly and recycling of subsequent components, meeting the green building concept; According to the conventional building design standards, the thickness of the exterior wall is 240mm, and the thickness of the interior wall is 120mm. The wall panel mechanism 3 includes a foamed ceramic partition panel 301. Two foamed ceramic partition panels 301 are installed between the upper beam mechanism 1 and the lower beam mechanism 2. There is a gap reserved between the two foamed ceramic partition panels 301, and the size of the gap is 2 centimeters. Such a design not only takes into account the structural stability but also provides a reasonable space for subsequent sealing and waterproof treatment; Polyurethane foam is filled in the joints between the wall panel mechanism 3 and the upper beam mechanism 1 and the lower beam mechanism 2, as well as in the gaps between the two foamed ceramic partition panels 301. The polyurethane foam has excellent sealing and waterproof performance. After filling, it can effectively fill the gaps, form a reliable waterproof barrier, and prevent water penetration; The double-layer design of the two foamed ceramic partition panels 301 combined with the filling of polyurethane foam significantly improves the sound insulation performance and effectively reduces the interference of external noise on the indoor environment; As the core material, the foamed ceramic partition panel 301 has outstanding advantages such as light weight, high structural strength, and strong sound insulation. Compared with traditional red bricks, aerated concrete bricks, and ALC wall panels, it can effectively reduce the load on the floor slab and improve the safety of the building structure. At the same time, its light weight makes the installation and disassembly process more convenient, reducing the construction difficulty and labor intensity; Through actual tests, the installation time of a single foamed ceramic partition panel 301 is ≤15 minutes. Compared with the traditional process, the construction efficiency has increased by 60%. This high construction speed enables construction projects to be completed in a shorter time, improving the economic and social benefits of the project.

[0022] This connection structure performs excellently in terms of seismic performance. The seismic fortification intensity can reach 8 degrees, and the displacement angle at the joint is ≤1 / 300, fully meeting the strict code requirements for the structural stability and seismic performance of high-rise buildings, providing a safe and reliable living environment for residents.

[0023] Paying attention to the implementation of the environmental protection concept, during the production and use process, the utilization rate of solid waste exceeds 30%, effectively reducing resource waste. The disassembled components can be reused, greatly reducing the discharge of construction waste, and playing a positive role in promoting the development of green buildings.

[0024] Please refer to Figure 2 , the upper inner wall of the upper concrete beam 101 is evenly provided with first clamping grooves 102 at equal intervals; The upper surface of the groove plate 103 is fixedly connected with first clamping columns 104 that are adapted to be inserted into the first clamping grooves 102 at equal intervals. One end of the first clamping column 104 inserted into the first clamping groove 102 expands outwards; When prefabricating the upper concrete beam 101, the first connecting component is pressed into the forming mold of the upper concrete beam 101, so as to integrally form the upper beam mechanism 1, and one end of the first clamping column 104 inserted into the first clamping groove 102 expands outward, so as to stably connect the upper concrete beam 101 and the first connecting component.

[0025] Please refer to Figure Figure 3 、 Figure 4 , the lower beam mechanism 2 includes a lower concrete beam 201 embedded in the outer wall. The upper surface of the lower concrete beam 201 is evenly provided with second clamping grooves 202 at equal intervals. The two side edges of the upper surface of the lower concrete beam 201 are respectively provided with inclined first mounting holes 203, and the first mounting holes 203 are staggered with the second clamping grooves 202; A second connecting component is installed on the upper surface of the lower concrete beam 201.

[0026] Please refer to Figure Figure 3 、 Figure 4 , the second connecting component includes a first plate 204 fixedly connected to the lower concrete beam 201. The lower surface of the first plate 204 is fixedly connected with second clamping columns 205 adapted to be inserted into the second clamping grooves 202 at equal intervals. One end of the second clamping column 205 inserted into the second clamping groove 202 expands outward; The two side edges of the upper surface of the first plate 204 are respectively provided with second mounting holes 206 adapted to be butted against the first mounting holes 203; The middle part of the upper surface of the second clamping column 205 is fixedly connected with a second plate 207. The two ends of the upper surface of the second plate 207 are respectively provided with connecting grooves 208; When prefabricating the lower concrete beam 201, the second connecting component is pressed into the forming mold of the lower concrete beam 201, so as to integrally form the lower beam mechanism 2, and one end of the second clamping column 205 inserted into the second clamping groove 202 expands outward, so as to stably connect the upper concrete beam 101 and the second connecting component.

[0027] Please refer to Figure 8 、 Figure 9 , lifting mechanisms 4 are respectively arranged at both ends of the second plate 207. The lifting mechanism 4 includes a seam plate 401, and a groove block 402 adapted to be inserted into the connecting groove 208 is fixedly connected to the middle part of the lower surface of the seam plate 401; The length of the groove block 402 is less than the length of the connecting groove 208. Therefore, when assembling the lifting mechanism 4, the groove block 402 can completely enter the connecting groove 208; The seam plate 401 is adapted to the gap at the connection between the wall panel mechanism 3 and the lower beam mechanism 2; After the wall panel mechanism 3 is installed between the upper beam mechanism 1 and the lower beam mechanism 2, the lifting mechanism 4 is inserted into the gap between the wall panel mechanism 3 and the lower beam mechanism 2 from the end of the second board 207. Specifically, the groove block 402 is inserted into the inner end of the receiving groove 208, so as to lift the foamed ceramic partition board 301 to the center of the upper beam mechanism 1 and the lower beam mechanism 2, improving the accuracy of splicing and the connection quality. Since the groove block 402 completely enters the receiving groove 208, when polyurethane foam is filled into the joint between the wall panel mechanism 3 and the upper beam mechanism 1 and the lower beam mechanism 2 and the gap between two foamed ceramic partition boards 301, the polyurethane foam can completely wrap the lifting mechanism 4, improving the overall stability.

[0028] Please refer to Figure 5 、 Figure 6 、 Figure 7 As shown in, at one end of the foamed ceramic partition board 301 close to the upper beam mechanism 1, a first insertion slot 302 adapted to the groove board 103 is provided, and at one end of the foamed ceramic partition board 301 close to the lower beam mechanism 2, a second insertion slot 303 adapted to the second board 207 is provided. At one end of the foamed ceramic partition board 301 close to the lower beam mechanism 2, inclined third mounting holes 304 are evenly provided at equal intervals. A reinforcing pipe 305 adapted to the second mounting hole 206 is fixedly inserted into the third mounting hole 304. When connecting the lower beam mechanism 2 and the wall panel mechanism 3, since the expansion screw 6 is driven through the foamed ceramic partition board 301, the relative strength of its material is relatively low. A reinforcing pipe 305 adapted to the direction of the third mounting hole 304 is pre-buried in the third mounting hole 304. The oblique angle of the reinforcing pipe 305 is the same as the oblique driving angle of the expansion screw 6. When the expansion screw 6 obliquely passes through the reinforcing pipe 305 and enters the outer wall, the reinforcing pipe 305 can disperse the acting force generated by the expansion screw 6, preventing the foamed ceramic partition board 301 from being damaged locally due to excessive force, and at the same time enhancing the anchoring effect of the connecting component. During the assembly process, the upper beam mechanism 1 and the lower beam mechanism 2 are respectively buried in the upper and lower outer walls, and then the two foamed ceramic partition boards 301 are respectively installed between the upper beam mechanism 1 and the lower beam mechanism 2 from both sides. Specifically, first, the upper end of the foamed ceramic partition board 301 is obliquely inserted into the groove board 103 through the first insertion slot 302, and then the lower end of the foamed ceramic partition board 301 is arranged in contact with the second board 207 through the second insertion slot 303. Since the gap at the joint is reserved in advance, the splicing of the foamed ceramic partition board 301 is more convenient.

[0029] Please refer to Figure 10, a fiber layer 5 adapted to be plugged with socket expansion screws 6 is inserted into the first mounting hole 203, the second mounting hole 206 and the reinforcing pipe 305, and the fiber layer 5 fits against the inner walls of the first mounting hole 203, the second mounting hole 206 and the reinforcing pipe 305; The connection between the wall panel mechanism 3 and the lower beam mechanism 2 is a multi-layer structural connection. At the layer where the expansion screws 6 need to be installed, a fiber layer 5 is filled against the inner walls of the first mounting hole 203, the second mounting hole 206 and the reinforcing pipe 305. The fiber layer 5 is laid by high-strength fibers in the direction of the oblique insertion of the expansion screws 6, which can effectively improve the bearing capacity of this area under oblique force, make the expansion screws 6 more stable after installation, and are not prone to problems such as loosening or delamination of the plates.

[0030] The working principle of the present invention is as follows: The working principle of the present invention is based on the synergistic effect of the modular design concept and high-performance materials. During construction, first, the groove plate 103 on the upper concrete beam 101 is precisely clamped with the foamed ceramic partition board 301, and then the wall panel mechanism 3 and the lower beam mechanism 2 are fastened by means of the expansion screws 6 to achieve modular rapid assembly. Polyurethane foaming agent is filled in the gaps between the foamed ceramic partition board 301 and the upper beam mechanism 1 and the lower beam mechanism 2 and between two foamed ceramic partition boards 301. By using the sealing and waterproof characteristics of the polyurethane foaming agent, the sealing and waterproof properties of the wall are enhanced, and the sound insulation effect is improved. Due to the characteristics of the foamed ceramic partition board 301 of not absorbing water, not absorbing moisture, not cracking, not deforming, and not mildewing, the drawbacks of traditional wall materials are fundamentally eliminated. Its light weight reduces the floor load and improves the construction efficiency; the sound insulation, heat insulation and heat preservation performance improve the living comfort. Moreover, even if there are gaps between the upper beam mechanism 1, the lower beam mechanism 2 and the wall panel mechanism 3 after decades, due to the water-absorbing property of the foamed ceramic partition board 301 and the waterproof effect of the polyurethane foaming agent, there will be no water leakage phenomenon. In addition, this connection structure pays attention to environmental protection. By improving the utilization rate of solid waste and realizing the reuse of components, the discharge of construction waste is reduced, and efficient, stable and environmentally friendly wall connection is realized, providing strong support for the sustainable development of the construction industry.

[0031] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A connection structure suitable for inner and outer walls and upper and lower beams, comprising an upper beam mechanism (1) and a lower beam mechanism (2), wherein a wall panel mechanism (3) is arranged between the upper beam mechanism (1) and the lower beam mechanism (2), and characterized in that: The upper beam mechanism (1) comprises an upper concrete beam (101) embedded in an exterior wall, a first connection component is installed on one side of the upper concrete beam (101), and the first connection component comprises a groove plate (103) fixedly embedded in the upper concrete beam (101); Expansion screws (6) for fixing the lower beam mechanism (2) and the wall panel mechanism (3) are provided between the lower beam mechanism (2) and the wall panel mechanism (3); The wall panel mechanism (3) comprises a foamed ceramic partition wall panel (301), two foamed ceramic partition wall panels (301) are installed between the upper beam mechanism (1) and the lower beam mechanism (2), and a gap is reserved between the two foamed ceramic partition wall panels (301); The connection between the wall panel mechanism (3) and the upper beam mechanism (1) and the lower beam mechanism (2) and the gap between the two foamed ceramic partition boards (301) are filled with polyurethane foaming agent.

2. A connection structure suitable for inner and outer walls and upper and lower beams according to claim 1, characterized in that: The upper inner wall of the upper concrete beam (101) is provided with first slots (102) at even intervals. The upper surface of the groove plate (103) is evenly and equidistantly fixedly connected with first clamping columns (104) adapted to be inserted into the first clamping slot (102), and one end of the first clamping column (104) inserted into the first clamping slot (102) is expanded outwards.

3. A connection structure suitable for inner and outer walls and upper and lower beams according to claim 2, characterized in that: The lower beam mechanism (2) comprises a lower concrete beam (201) embedded in the outer wall, the upper surface of the lower concrete beam (201) is provided with second slots (202) evenly spaced apart, and both sides of the upper surface of the lower concrete beam (201) are respectively provided with inclined first mounting holes (203), and the first mounting holes (203) are staggered with the second slots (202); A second connection assembly is installed on the upper surface of the lower concrete beam (201).

4. A connection structure suitable for inner and outer walls and upper and lower beams according to claim 3, characterized in that: The second connection assembly comprises a first plate (204) fixedly connected to the lower concrete beam (201), second clamping columns (205) adapted to be inserted into the second clamping slot (202) being fixedly connected to the lower surface of the first plate (204) at equal intervals and uniformly, and one end of the second clamping column (205) inserted into the second clamping slot (202) is expanded outwards; Second mounting holes (206) adapted to connect to the first mounting holes (203) are respectively provided on both sides of the upper surface of the first plate (204); A second plate (207) is fixedly connected to the middle of the upper surface of the second clamping column (205), and connecting grooves (208) are respectively formed at both ends of the upper surface of the second plate (207).

5. A connection structure suitable for inner and outer walls and upper and lower beams according to claim 4, characterized in that: Lifting mechanisms (4) are respectively provided at both ends of the second plate (207), the lifting mechanisms (4) comprising a seam plate (401), a slot block (402) adapted to fit the plug-in slot (208) being fixedly connected to the middle of the lower surface of the seam plate (401); The seam plate (401) is adapted to the gap at the connection between the wall panel mechanism (3) and the lower beam mechanism (2).

6. A connection structure suitable for inner and outer walls and upper and lower beams according to claim 5, characterized in that: The end of the foamed ceramic partition wall plate (301) close to the upper beam mechanism (1) is provided with a first slot (302) adapted to the groove plate (103), and the end of the foamed ceramic partition wall plate (301) close to the lower beam mechanism (2) is provided with a second slot (303) adapted to the second plate (207); The end of the foamed ceramic partition board (301) close to the lower beam mechanism (2) is evenly and equidistantly provided with inclined third mounting holes (304), and a reinforcing tube (305) adapted to correspond to the second mounting hole (206) is fixedly inserted in the third mounting hole (304).

7. A connection structure suitable for inner and outer walls and upper and lower beams according to claim 6, characterized in that: The first mounting hole (203), the second mounting hole (206) and the reinforcing tube (305) are adapted to be plugged with a fiber layer (5) having a sleeve expansion screw (6), and the fiber layer (5) is in contact with the inner walls of the first mounting hole (203), the second mounting hole (206) and the reinforcing tube (305).

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