Assembly module type concrete laminated slab

Abstract

The utility model relates to the technical field of concrete laminated slabs, in particular to an assembly module type concrete laminated slab which comprises a laminated slab body, an inserting cylinder is embedded in one end of the laminated slab body, an inserting groove is formed in the inserting cylinder, and a pouring hole is reserved in the position, located at the top end of the inserting cylinder, of the surface of the laminated slab body. The utility model has the beneficial effects that the adjusting column can be rotated to extend and retract the length of the adjusting column and the insertion rod extending out of the end face of the laminated slab, the damaged adjusting column and insertion rod can be detached and replaced, and the insertion rod is in fastening connection with the insertion cylinder through poured concrete, so that the two laminated slabs are fastened and assembled, and the assembly efficiency is improved. High connection strength and stability are achieved; the extending height of the reinforcing columns can be adjusted according to the thickness of the cast-in-place reinforced concrete layer, the connecting strength between the cast-in-place reinforced concrete layer and the laminated slab is improved, and the reinforcing columns can be detached so that the laminated slab can be stacked conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete composite slabs, in particular to an assembled modular concrete composite slab. Background Art

[0002] The industrialization of construction has become an inevitable trend in the development of China's construction industry. Transforming the in-situ construction mode into an assembled integral construction mode of prefabrication in factories and on-site assembly has become the mission of modern construction practitioners. At present, the composite floor slabs mainly include ordinary flat prestressed concrete composite floor slabs, precast ribbed prestressed concrete composite slabs, and ordinary steel bar truss composite slabs.

[0003] The reinforced concrete composite slab is an assembled integral floor slab formed by laminating a precast slab and a cast-in-place reinforced concrete layer. The composite floor slab has good integrity, high stiffness, can save formwork, the upper and lower surfaces of the slab are flat, which is convenient for the decoration of the finishing layer, and is suitable for high-rise buildings and large-span buildings with high requirements for overall stiffness.

[0004] For example, the Chinese patent publication number "CN215716439U" in the prior art provides an assembled modular concrete composite slab, which includes a plurality of composite slab bodies. The left ends of the plurality of composite slab bodies are fixedly connected with T-shaped guide blocks. T-shaped guide grooves matching the T-shaped guide blocks are opened above the right sides of the plurality of composite slab bodies. A lead screw is inserted into the T-shaped guide block. The front and rear ends of the lead screw penetrate through the composite slab body and extend to the outside of the composite slab body. Chute grooves are opened on the left sides of the front and rear ends of the plurality of composite slab bodies.

[0005] By rotating the limit nut of the device, the T-shaped guide block is prevented from shaking in the T-shaped guide groove, improving the overall stability of the adjacent composite slab bodies. The clamping block is clamped into the clamping groove by the elastic force of the spring, ensuring that the adjacent two composite slab bodies will not separate, achieving the effect of convenient clamping and fixing. At the same time, the assembly splicing tightness between the two composite slab bodies is improved.

[0006] For the existing assembled modular concrete composite slab, the assembly structure is relatively fixed. It is easily damaged by bumps before assembly, resulting in potential safety hazards in the installation strength after the two composite slabs are assembled. It is not convenient to disassemble and replace the assembly structure, nor is it convenient to adjust the extension length of the assembly structure, which is not conducive to the flexible assembly between the two composite slabs. At the same time, the top of the composite slab is relatively smooth, lacking a strong and high-strength connection with the cast-in-place reinforced concrete layer, easily resulting in separation between the cast-in-place reinforced concrete layer and the composite slab, and the connection strength is not high. Summary of the Utility Model

[0007] The purpose of the present utility model is to solve the drawbacks existing in the prior art, such as the assembly structure being relatively fixed, being easily damaged by bumps before assembly, resulting in potential safety hazards in the installation strength after the assembly of two laminated plates, and being unable to facilitate the disassembly and replacement of the assembly structure, nor to conveniently adjust the extended length of the assembly structure. Therefore, an assembled modular concrete laminated plate is proposed.

[0008] To achieve the above purpose, the present utility model provides the following technical solutions:

[0009] Design an assembled modular concrete laminated plate, including a laminated plate. One end of the laminated plate is inlaid with a plug-in cylinder, and a plug-in groove is arranged inside the plug-in cylinder. A pouring hole is reserved on the surface of the laminated plate at the position of the top end of the plug-in cylinder, and the bottom end of the pouring hole communicates with the top end of the plug-in groove. The other end of the laminated plate is inlaid with a connecting cylinder, a reinforcing plate is fixed on the outer side of the connecting cylinder, an adjusting groove is arranged inside the connecting cylinder, an adjusting column is connected inside the adjusting groove, a plug-in rod is fixed at the outer end of the adjusting column, a pouring groove is opened on the surface of the plug-in rod, sealing grooves are opened on the upper and lower sides of both ends of the laminated plate, sealing gaskets are bonded to both ends of the laminated plate, sealing strips are connected to both sides of the sealing gaskets, the sealing strips are tightly inserted into the sealing grooves, and a protective pad covers the top end of the laminated plate.

[0010] Furthermore, positioning cylinders are inlaid on both sides of the top end of the laminated plate, reinforcing blocks are evenly fixed on the outer sides of the positioning cylinders, a positioning groove is arranged inside the positioning cylinders, and a reinforcing column is inserted into the positioning groove.

[0011] Furthermore, the laminated plate is of a rectangular plate structure. Two laminated plates are assembled and connected, and the plug-in cylinder and the connecting cylinder are arranged in alignment. The outer end of the adjusting column and the plug-in rod slide and insert into the plug-in groove.

[0012] Furthermore, both the plug-in cylinder and the connecting cylinder are of a cylindrical structure, their outer ports are flush with the end faces of the laminated plate, and both are horizontally arranged. The plug-in groove is of a cylindrical groove structure, and the adjusting groove is of a threaded groove structure.

[0013] Furthermore, the adjusting column is of a threaded rod structure and is in threaded fit connection with the adjusting groove. The plug-in rod is of a rectangular column structure, and both the length and width are smaller than the diameter of the adjusting column.

[0014] Furthermore, both the sealing gasket and the sealing strip are made of sealing rubber material. Both the sealing strip and the sealing groove are of a strip-shaped structure and are equal in width to the laminated plate.

[0015] Further, the protective pad includes a waterproof layer and an antioxidant layer. The antioxidant layer is bonded to the top of the laminated plate and covers the pouring hole. The waterproof layer is made of polyethylene propylene waterproof material, and the antioxidant layer is made of graphite high-temperature antioxidant coating.

[0016] Further, the positioning cylinder is of a cylindrical structure and is vertically arranged. Its top is flush with the top of the protective pad. The reinforcing block is of a rectangular block structure. The positioning groove is of a threaded groove structure. The reinforcing column is of a threaded column structure and is threadedly engaged with the positioning groove. Its top protrudes upward from the top of the protective pad.

[0017] The beneficial effects of an assembled modular concrete laminated plate proposed by the present utility model are as follows:

[0018] 1. In the present utility model, a plug-in cylinder and a connection cylinder are respectively arranged at both ends of the laminated plate. In the adjustment groove inside the connection cylinder, an adjustment column is threadedly connected. The adjustment column can be rotated to adjust the length of the adjustment column and the plug-in rod extending out of the end face of the laminated plate, and the damaged adjustment column and plug-in rod can be disassembled and replaced. Therefore, when two laminated plates are assembled, the plug-in cylinder is aligned with the connection cylinder, and the adjustment column is rotated to adjust the extending length of the adjustment column and the plug-in rod. At the same time, the outer end of the adjustment column and the plug-in rod are inserted into the plug-in groove of the plug-in cylinder. Moreover, the assembly part between the two laminated plates is sealed and waterproofed through a gasket and a sealing strip. At the same time, concrete is poured into the plug-in groove from the pouring hole. The concrete fills the plug-in groove and the pouring groove. After the concrete sets, the plug-in rod is firmly connected with the plug-in cylinder through the poured concrete, so that the two laminated plates are firmly assembled, having high connection strength and stability.

[0019] 2. In the positioning cylinders pre-embedded on both sides of the top of the laminated plate of the present utility model, the reinforcing column can be rotated and adjusted. According to the thickness of the cast-in-place reinforced concrete layer, the height of the protruding reinforcing column can be adjusted to improve the connection strength between the cast-in-place reinforced concrete layer and the laminated plate. At the same time, the reinforcing column can be disassembled and replaced to avoid the damaged reinforcing column. At the same time, the reinforcing column can be disassembled to facilitate the stacking of laminated plates. Therefore, after two laminated plates are assembled and concrete is poured into the plug-in groove, a protective pad is bonded to the top of the two laminated plates to improve waterproof and antioxidant protection, and the reinforcing column protrudes from the protective pad. Description of the Drawings

[0020] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 is of the present utility model Figure 1 magnified view at C;

[0022] Figure 3 is of the present utility model Figure 1Schematic diagram of the partial structure of the positioning cylinder

[0023] Figure 4 This is the present utility model Figure 1 Cross-sectional view

[0024] Figure 5 This is the present utility model Figure 4 Enlarged view at A of this utility model

[0025] Figure 6 This is the present utility model Figure 4 Cross-sectional view

[0026] Figure 7 This is the present utility model Figure 6 Enlarged view at B of this utility model

[0027] Figure 8 This is the present utility model Figure 1 Schematic diagram of the partial structure of the protective pad of this utility model

[0028] In the figure: 1, laminated board; 2, insertion cylinder; 3, insertion slot; 4, protective pad; 5, strengthening column; 6, connection cylinder; 7, adjustment slot; 8, sealing gasket; 9, insertion rod; 10, adjustment column; 11, sealing groove; 12, sealing strip; 13, pouring hole; 14, pouring groove; 15, reinforcement plate; 16, reinforcement block; 17, positioning cylinder; 18, positioning slot; 19, antioxidant layer; 20, waterproof layer Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments

[0030] Embodiment 1

[0031] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8, An assembled modular concrete composite slab in the illustration, including a composite slab 1. One end of the composite slab 1 is inlaid with a plug-in cylinder 2. An insertion slot 3 is arranged inside the plug-in cylinder 2. A pouring hole 13 is reserved on the surface of the composite slab 1 at the position of the top end of the plug-in cylinder 2, and the bottom end of the pouring hole 13 communicates with the top end of the insertion slot 3. The other end of the composite slab 1 is inlaid with a connecting cylinder 6. A reinforcing plate 15 is fixed on the outer side of the connecting cylinder 6. An adjusting slot 7 is arranged inside the connecting cylinder 6. An adjusting column 10 is connected inside the adjusting slot 7. A plug-in rod 9 is fixed at the outer end of the adjusting column 10. A pouring groove 14 is formed on the surface of the plug-in rod 9. Sealing grooves 11 are formed on the upper and lower sides at both ends of the composite slab 1. Sealing pads 8 are bonded to both ends of the composite slab 1. Sealing strips 12 are connected to both sides of the sealing pads 8. The sealing strips 12 are tightly inserted into the sealing grooves 11. A protective pad 4 covers the top end of the composite slab 1.

[0032] A plug-in cylinder 2 and a connecting cylinder 6 are respectively arranged at both ends of the composite slab 1. In the adjusting slot 7 inside the connecting cylinder 6, the adjusting column 10 is threadedly connected. The adjusting column 10 can be rotated to adjust the length of the adjusting column 10 and the plug-in rod 9 extending out of the end face of the composite slab 1, and the damaged adjusting column 10 and plug-in rod 9 can be disassembled and replaced. Therefore, when two composite slabs 1 are assembled, the plug-in cylinder 2 is aligned with the connecting cylinder 6, and the adjusting column 10 is rotated to adjust the extending length of the adjusting column 10 and the plug-in rod 9. At the same time, the outer end of the adjusting column 10 and the plug-in rod 9 are inserted into the insertion slot 3 of the plug-in cylinder 2. And the assembly part between the two composite slabs 1 is sealed and waterproofed through the sealing pads 8 and the sealing strips 12. At the same time, concrete is poured into the insertion slot 3 from the pouring hole 13. The insertion slot 3 and the pouring groove 14 are filled with concrete. After the concrete solidifies, the plug-in rod 9 is firmly connected to the plug-in cylinder 2 through the poured concrete, so that the two composite slabs 1 are firmly assembled, with high connection strength and stability.

[0033] Positioning cylinders 17 are inlaid on both sides of the top end of the composite slab 1. Reinforcing blocks 16 are evenly fixed on the outer side of the positioning cylinders 17. A positioning slot 18 is arranged inside the positioning cylinders 17. A reinforcing column 5 is inserted into the positioning slot 18.

[0034] In the positioning cylinders 17 pre-embedded on both sides of the top of the laminated slab 1, the strengthening column 5 can be rotated and adjusted. According to the thickness of the cast-in-place reinforced concrete layer, the height of the protruding strengthening column 5 can be adjusted to improve the connection strength between the cast-in-place reinforced concrete layer and the laminated slab 1. At the same time, the strengthening column 5 can be disassembled and replaced to avoid the damaged strengthening column 5 affecting the connection strength and stability. At the same time, the strengthening column 5 can be disassembled to facilitate the stacking of the laminated slabs 1. Therefore, after two laminated slabs 1 are assembled and concrete is poured into the insertion slots 3, a protective pad 4 is bonded to the top of the two laminated slabs 1, which can improve waterproof and antioxidant protection, and the strengthening column 5 protrudes from the protective pad to facilitate a firm and stable connection with the cast-in-place reinforced concrete layer.

[0035] The laminated slab 1 is a rectangular plate structure. Two laminated slabs 1 are assembled and connected, and the insertion cylinder 2 and the connection cylinder 6 are arranged in alignment. The outer end of the adjusting column 10 and the insertion rod 9 are slidably inserted into the insertion slot 3.

[0036] Both the insertion cylinder 2 and the connection cylinder 6 are cylindrical structures, and their outer ports are flush with the end face of the laminated slab 1 and are both horizontally arranged. The insertion slot 3 is a cylindrical groove structure, and the adjustment slot 7 is a threaded groove structure.

[0037] The adjusting column 10 is a threaded rod structure and is in threaded fit with the adjusting slot 7. The insertion rod 9 is a rectangular column structure, and its length and width are both smaller than the diameter of the adjusting column 10. Both the sealing pad 8 and the sealing strip 12 are made of sealing rubber material. Both the sealing strip 12 and the sealing groove 11 are strip-shaped structures and are equal in width to the laminated slab 1.

[0038] The protective pad 4 includes a waterproof layer 20 and an antioxidant layer 19. The antioxidant layer 19 is bonded to the top of the laminated slab 1 and covers the pouring hole 13. The waterproof layer 20 is made of polyethylene propylene waterproof material, and the antioxidant layer 19 is made of graphite high-temperature antioxidant coating.

[0039] Example 2

[0040] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8, An assembled modular concrete composite slab in the figure includes a composite slab 1. One end of the composite slab 1 is inlaid with a socket cylinder 2. An insertion slot 3 is arranged inside the socket cylinder 2. A pouring hole 13 is reserved on the surface of the composite slab 1 at the position of the top end of the socket cylinder 2, and the bottom end of the pouring hole 13 communicates with the top end of the insertion slot 3. The other end of the composite slab 1 is inlaid with a connecting cylinder 6. A reinforcing plate 15 is fixed on the outer side of the connecting cylinder 6. An adjustment groove 7 is arranged inside the connecting cylinder 6. An adjustment column 10 is connected inside the adjustment groove 7. A socket rod 9 is fixed at the outer end of the adjustment column 10. A pouring groove 14 is formed on the surface of the socket rod 9. Sealing grooves 11 are formed on the upper and lower sides at both ends of the composite slab 1. Sealing gaskets 8 are bonded to both ends of the composite slab 1. Sealing strips 12 are connected to both sides of the sealing gaskets 8. The sealing strips 12 are tightly inserted into the sealing grooves 11. A protection pad 4 covers the top end of the composite slab 1.

[0041] A socket cylinder 2 and a connecting cylinder 6 are respectively arranged at both ends of the composite slab 1. In the adjustment groove 7 inside the connecting cylinder 6, the adjustment column 10 is threadedly connected. The adjustment column 10 can be rotated to adjust the length of the adjustment column 10 and the socket rod 9 extending out of the end face of the composite slab 1, and the damaged adjustment column 10 and socket rod 9 can be disassembled and replaced. Therefore, when two composite slabs 1 are assembled, the socket cylinder 2 and the connecting cylinder 6 are aligned, and the adjustment column 10 is rotated to adjust the extending length of the adjustment column 10 and the socket rod 9. At the same time, the outer end of the adjustment column 10 and the socket rod 9 are inserted into the insertion slot 3 of the socket cylinder 2. And the assembly part between the two composite slabs 1 is sealed and waterproofed through the sealing gasket 8 and the sealing strip 12. At the same time, concrete is poured into the insertion slot 3 from the pouring hole 13. The insertion slot 3 and the pouring groove 14 are filled with concrete. After the concrete solidifies, the socket rod 9 is firmly connected to the socket cylinder 2 through the poured concrete, so that the two composite slabs 1 are firmly assembled, with high connection strength and stability.

[0042] Positioning cylinders 17 are inlaid on both sides of the top end of the composite slab 1. Reinforcing blocks 16 are evenly fixed on the outer side of the positioning cylinders 17. A positioning slot 18 is arranged inside the positioning cylinders 17. A reinforcing column 5 is inserted into the positioning slot 18.

[0043] In the positioning cylinders 17 pre-embedded on both sides of the top end of the laminated slab 1, the strengthening column 5 can be rotated and adjusted. According to the thickness of the cast-in-place reinforced concrete layer, the height of the protruding strengthening column 5 can be adjusted to improve the connection strength between the cast-in-place reinforced concrete layer and the laminated slab 1. At the same time, the strengthening column 5 can be disassembled and replaced to avoid the influence of a damaged strengthening column 5 on the connection strength and stability. At the same time, the strengthening column 5 can be disassembled to facilitate the stacking of the laminated slabs 1. Therefore, after two laminated slabs 1 are assembled and concrete is poured into the insertion slots 3, a protective pad 4 is bonded to the top ends of the two laminated slabs 1, which can improve waterproof and antioxidant protection, and the strengthening column 5 protrudes from the protective pad to facilitate a firm and stable connection with the cast-in-place reinforced concrete layer.

[0044] The positioning cylinder 17 is of a cylindrical structure and is vertically arranged. Its top end is flush with the top end of the protective pad 4. The reinforcing block 16 is of a rectangular block structure. The positioning groove 18 is of a threaded groove structure. The strengthening column 5 is of a threaded column structure and is threadedly engaged with the positioning groove 18. Its top end protrudes upward from the top end of the protective pad 4.

[0045] Working method: Insertion cylinders 2 and connection cylinders 6 are respectively arranged at both ends of the laminated slab 1. In the adjustment groove 7 inside the connection cylinder 6, an adjustment column 10 is threadedly connected. The adjustment column 10 can be rotated to adjust the length of the telescopic adjustment column 10 and the insertion rod 9 protruding from the end face of the laminated slab 1, and the damaged adjustment column 10 and insertion rod 9 can be disassembled and replaced. Therefore, when two laminated slabs 1 are assembled, the insertion cylinder 2 is aligned with the connection cylinder 6, and the adjustment column 10 is rotated to adjust the protruding length of the telescopic adjustment column 10 and the insertion rod 9. At the same time, the outer end of the adjustment column 10 and the insertion rod 9 are inserted into the insertion slot 3 of the insertion cylinder 2. And the assembly part between the two laminated slabs 1 is subjected to a sealing and waterproof treatment through a sealing gasket 8 and a sealing strip 12. At the same time, concrete is poured into the insertion slot 3 from the pouring hole 13. The concrete fills the insertion slot 3 and the pouring slot 14. After the concrete sets, the insertion rod 9 is firmly connected to the insertion cylinder 2 through the poured concrete, so that the two laminated slabs 1 are firmly assembled, with high connection strength and stability.

[0046] In the positioning cylinders 17 pre-embedded on both sides of the top end of the laminated slab 1, the strengthening column 5 can be rotated and adjusted. According to the thickness of the cast-in-place reinforced concrete layer, the height of the protruding strengthening column 5 can be adjusted to improve the connection strength between the cast-in-place reinforced concrete layer and the laminated slab 1. At the same time, the strengthening column 5 can be disassembled and replaced to avoid the influence of a damaged strengthening column 5 on the connection strength and stability. At the same time, the strengthening column 5 can be disassembled to facilitate the stacking of the laminated slabs 1. Therefore, after two laminated slabs 1 are assembled and concrete is poured into the insertion slots 3, a protective pad 4 is bonded to the top ends of the two laminated slabs 1, which can improve waterproof and antioxidant protection, and the strengthening column 5 protrudes from the protective pad to facilitate a firm and stable connection with the cast-in-place reinforced concrete layer.

[0047] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. A prefabricated modular concrete composite slab, comprising a composite slab (1), characterized in that: One end of the laminated slab (1) is inlaid with a socket cylinder (2). An insertion slot (3) is arranged inside the socket cylinder (2). A casting hole (13) is reserved on the surface of the laminated slab (1) at the position of the top end of the socket cylinder (2), and the bottom end of the casting hole (13) communicates with the top end of the insertion slot (3). The other end of the laminated slab (1) is inlaid with a connection cylinder (6). A reinforcing plate (15) is fixed on the outer side of the connection cylinder (6). An adjustment slot (7) is arranged inside the connection cylinder (6). An adjustment column (10) is connected inside the adjustment slot (7). A socket rod (9) is fixed at the outer end of the adjustment column (10). A casting groove (14) is formed on the surface of the socket rod (9). Sealing grooves (11) are formed on the upper and lower sides of both ends of the laminated slab (1). Sealing gaskets (8) are bonded to both ends of the laminated slab (1). Both sides of the sealing gasket (8) are connected with sealing strips (12). The sealing strips (12) are tightly inserted into the sealing grooves (11). A protection pad (4) covers the top end of the laminated slab (1).

2. The assembled modular concrete composite slab according to claim 1, characterized in that: Positioning cylinders (17) are inlaid on both sides of the top end of the laminated slab (1). Reinforcing blocks (16) are evenly fixed on the outer side of the positioning cylinders (17). A positioning slot (18) is arranged inside the positioning cylinders (17). A reinforcing column (5) is inserted into the positioning slot (18).

3. An assembled modular concrete composite slab according to claim 1, characterized in that: The laminated slab (1) is of a rectangular plate structure. Two laminated slabs (1) are assembled and connected, and the socket cylinder (2) and the connection cylinder (6) are arranged in alignment. The outer end of the adjustment column (10) and the socket rod (9) are slidably inserted into the insertion slot (3).

4. A prefabricated modular concrete composite slab according to claim 1, wherein: Both the socket cylinder (2) and the connection cylinder (6) are of a cylindrical structure. Their outer ports are flush with the end faces of the laminated slab (1) and are both horizontally arranged. The insertion slot (3) is of a cylindrical groove structure. The adjustment slot (7) is of a threaded groove structure.

5. A prefabricated modular concrete composite slab according to claim 1, wherein: The adjustment column (10) is of a threaded rod structure and is in threaded fit connection with the adjustment slot (7). The socket rod (9) is of a rectangular column structure, and its length and width are both smaller than the diameter of the adjustment column (10).

6. The assembled modular concrete composite slab according to claim 1, wherein: Both the sealing gasket (8) and the sealing strip (12) are made of sealing rubber material. Both the sealing strip (12) and the sealing groove (11) are of a long strip structure and are equal in width to the laminated slab (1).

7. An assembled modular concrete composite slab according to claim 1, characterized in that: The protection pad (4) includes a waterproof layer (20) and an antioxidant layer (19). The antioxidant layer (19) is bonded to the top end of the laminated slab (1) and covers the casting hole (13). The waterproof layer (20) is made of polyethylene propylene waterproof material. The antioxidant layer (19) is made of graphite high-temperature antioxidant coating.

8. The assembled modular concrete composite slab according to claim 2, characterized in that: The positioning cylinder (17) is of a cylindrical structure and is vertically arranged. Its top end is flush with the top end of the protection pad (4). The reinforcing block (16) is of a rectangular block structure. The positioning slot (18) is of a threaded groove structure. The reinforcing column (5) is of a threaded column structure and is in threaded fit connection with the positioning slot (18). Its top end protrudes upward from the top end of the protection pad (4).

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