A modular assembly type outer swing door suitable for urban renewal construction

Abstract

The utility model relates to the technical field of fabricated building, disclose a kind of modularization fabricated outer swing suitable for city renewal construction, bottom plate, floor, veneer, roof and door and window frame jointly constitute the overall structure of fabricated outer swing, the component of modularization building of the utility model can be standardized mass production, quality is more secure, less construction waste is generated in the process of construction, and all components are assembled directly transported to the scene, shorten the construction period of assembly, less demand for on-site construction personnel, can save a lot of labor cost, modularization commercial outer swing can be quickly built and put into use, management is convenient, low maintenance cost in later period, to quickly vitalize lost space, clear function, beautiful and various, wide range of control, achieve small investment and large revenue, adopt unified modular component, simple splicing, simple construction, clean and fast, varied, rich in product.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building technology, specifically a modular prefabricated outdoor structure suitable for urban renewal construction. Background Technology

[0002] Prefabricated buildings refer to buildings assembled on-site from prefabricated components. With the development of modern industrial technology, houses can be manufactured in batches like machine production. Prefabricated house components can simply be transported to the construction site and assembled. According to the form of prefabricated components and construction methods, prefabricated buildings can be divided into five types: block buildings, panel buildings, box buildings, frame panel buildings, and lift-slab lift-floor buildings. Prefabricated buildings have been rapidly promoted around the world due to their fast construction speed and low production cost. Currently, in the process of rapid urban renewal, it is necessary to revitalize idle land by constructing prefabricated outdoor structures in idle urban areas. This can stimulate urban economic vitality, promote the application and promotion of new products, new technologies, new business formats, and new models, and help boost investment and consumption. Modular commercial outdoor structures can flexibly combine various outdoor modules according to different commercial sites and needs, which can effectively fit the current rapid urban renewal construction.

[0003] In the current construction process of prefabricated buildings, since the components of prefabricated buildings are mostly composed of integral surfaces, large-volume building components cannot be flexibly assembled in space-constrained sites, which affects the scope of practical application. At the same time, in the actual assembly process of current prefabricated buildings, due to the lack of means to reinforce the structure, the structure is prone to insufficient stability after long-term use. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a modular prefabricated external structure suitable for urban renewal construction. It solves the problem that in the actual construction process of current prefabricated buildings, since the components of prefabricated buildings are mostly composed of integral surfaces, large-volume building components cannot be flexibly assembled in space-constrained sites, which affects the scope of practical application. At the same time, in the actual assembly process of current prefabricated buildings, the lack of means to reinforce the structure leads to insufficient stability of the structure after long-term use.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a modular prefabricated outdoor structure suitable for urban renewal construction, comprising a base plate, floor, decorative panel, top plate, and door and window frames. The base plate, floor, decorative panel, top plate, and door and window frames together form the overall structure of the prefabricated outdoor structure. The four corners of the prefabricated outdoor structure are stably supported by support columns, and the base plate is arranged on a horizontal ground. The top surface of the base plate is covered with floor. The front, back, left, and right sides of the prefabricated outdoor structure are assembled by splicing decorative panels, and the top of the prefabricated outdoor structure is provided with a top plate. The door and window frames are embedded in the decorative panel on the front side of the prefabricated outdoor structure.

[0006] The base plate, floor, decorative panel, and top plate are all provided with horizontal assembly grooves at their horizontal ends and vertical assembly grooves at their vertical ends. Stable assembly is achieved between adjacent base plates, floor plates, decorative panels, and top plates by means of tensioning assembly strips that cooperate with the horizontal and vertical assembly grooves.

[0007] The two ends of the tensioning assembly strip are respectively provided with fitting strips that fit tightly into the horizontal assembly groove and the vertical assembly groove, and the ends of the fitting strips are glued with extrusion rubber plates.

[0008] The two vertical sides of the support column are fixedly connected with column clips, and the support column is assembled and connected to the vertical mounting groove of the decorative panel through the column clips at its edge.

[0009] As a preferred modular prefabricated exterior structure for urban renewal construction, the decorative panels form the surrounding protective structure of the building. The floor ensures that the interior of the building is clean, stable, and allows for natural walking and use. The roof provides shelter from wind and rain, shades the sun, and blocks debris. The base provides moisture and impact protection and anchors the building's position. The support columns support the building. The door and window frames provide lighting, ventilation, and a place for sale.

[0010] As a preferred modular prefabricated external swing technology solution applicable to urban renewal construction, the cross-sections of the horizontal assembly groove and the vertical assembly groove are both convex. The tensioning assembly strip and the fitting strip form a structure with protruding ends. The extrusion rubber plate at the edge of the fitting strip is in close contact with the inner wall of the horizontal assembly groove and the vertical assembly groove.

[0011] As a preferred modular prefabricated external swing technology applicable to urban renewal construction, the bottom end of the support column is fixedly connected to the top surface of the base plate, the base plate is anchored to the ground, and the support column is connected to the vertical assembly grooves of the two vertical decorative panel edges by two column clips on its side.

[0012] As a preferred modular prefabricated external swing technology solution applicable to urban renewal construction, the bottom plate, floor, decorative panel, top plate, tensioning assembly strip, fitting strip and extrusion rubber plate are all provided with through holes. The edges of the door and window frame are provided with door and window tensioning holes at the corresponding positions of the through holes, and tensioning steel cables are connected through the through holes in the same direction. The support column and the column clips on its side are provided with through grooves at the corresponding positions of the through holes in the same straight direction, and the sides of the support column are provided with matching square grooves at the corresponding positions of the through grooves in the same direction.

[0013] The end of the tensioning steel cable is provided with a threaded end post, and the edge of the threaded end post is fixedly connected to a fitting square plate, and the outer side of the threaded end post is connected to a fastening nut by thread.

[0014] As a preferred modular prefabricated external swing technology solution applicable to urban renewal construction, adjacent two base plates, floor, decorative panels and top plates are all tensioned in the same direction by tensioning steel cables, and the ends of the tensioning steel cables are connected to the inside of the tensioning holes of doors and windows by limiting bolts.

[0015] As a preferred modular prefabricated external swing technology applicable to urban renewal construction, the fitting square plate is tightly fitted to the inner side of the fitting square groove, and the tensioning steel cable is formed by twisting several steel wires, and the tensioning steel cable is tightened and straightened by fastening nuts at both ends.

[0016] Compared with existing technologies, this utility model provides a modular prefabricated outdoor structure suitable for urban renewal construction, which has the following beneficial effects:

[0017] 1. The modular building is constructed using components such as a base plate, floor, decorative panels, roof, and door and window frames. This allows for the rapid assembly and construction of mobile commercial outdoor spaces, maximizing land use and achieving rapid construction while reducing costs. The decorative panels form the surrounding enclosure of the structure, the floor ensures a clean and stable interior for natural walking and use, the roof provides shelter from wind and rain, shade, and obstruction, the base plate provides moisture and impact protection, and anchors the structure, the support columns support the structure, and the door and window frames provide lighting, ventilation, and sales functions, ensuring the practical application of this modular commercial outdoor space.

[0018] Meanwhile, the components of modular buildings can be mass-produced in a standardized manner, ensuring quality. They generate less construction waste during construction, are energy-saving and environmentally friendly, and all components are pre-assembled and transported directly to the site for assembly, shortening the assembly construction period and requiring fewer on-site construction personnel, thus saving a lot of labor costs.

[0019] In urban renewal design, modular commercial outdoor spaces can be quickly built and put into use, are easy to manage, have low maintenance costs, and can quickly revitalize lost spaces. They have clear functions, are aesthetically pleasing and diverse, have a wide range of controllability, and can generate high revenue with low investment. They use standardized modular components, are easy to assemble, simple to build, clean and quick, and offer a variety of changes and a rich selection of products.

[0020] 2. By creating horizontal and vertical assembly slots in different directions on the sides of the base plate, floor, decorative panel, top plate, and door and window frames, the tensioning strips and interlocking strips can be inserted into the corresponding horizontal and vertical assembly slots during assembly. This allows for the alignment and tightening connection between the components of two modular buildings through riveting, ensuring a tight connection between the two components during assembly. At the same time, the use of extrusion plates allows for the compression of the contact surfaces, and the sealing function provided by the extrusion plates ensures the overall airtightness of the assembled modular building. Combined with the column clips on the side of the support columns, it is convenient to quickly connect the support columns to the decorative panels, thereby strengthening the overall support stability of the assembled modular building through the support columns.

[0021] 3. By creating perforations and through slots inside the base plate, floor, decorative panels, top plate, and door and window frames, tension cables can be easily threaded through. Threaded end posts, fitted square plates, and fastening nuts facilitate the tightening of the tension cables. This internal bracing structure further enhances the overall tightness of the modular building's connections. The fitted square plates provide a large support surface, ensuring stability, and their seamless connection within the fitted square slots maintains the overall aesthetics of the modular building through an invisible connection. The tensioning holes in the doors and windows allow for the tightening of the door and window frames with adjacent decorative panels, ensuring the stability of the door and window frame connections. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is an assembly diagram of the column clip of this utility model.

[0024] Figure 3 This is a structural schematic diagram of the decorative panel of this utility model.

[0025] Figure 4 This is a structural schematic diagram of the tensioning assembly strip of this utility model.

[0026] Figure 5 This is a structural schematic diagram of the support column of this utility model.

[0027] Figure 6This is a schematic diagram of the tensioning steel cable of this utility model.

[0028] Figure 7 This is a schematic diagram of the structure of the fastening nut of this utility model.

[0029] In the diagram: 1. Base plate; 2. Floor; 3. Decorative panel; 4. Top plate; 5. Door and window frame; 6. Support column; 7. Horizontal assembly groove; 8. Vertical assembly groove; 9. Tensioning assembly strip; 10. Fitting clip; 11. Extruded rubber sheet; 12. Column clip; 13. Perforation; 14. Tensioning cable; 15. Through groove; 16. Fitting square groove; 17. Threaded end column; 18. Fitting square plate; 19. Fastening nut; 20. Door and window tensioning hole. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0031] In the description of this utility model, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0032] In the description of this utility model, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0033] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Example: Please refer to Figure 1-7 This utility model provides the following technical solution: a modular prefabricated outdoor structure suitable for urban renewal construction, comprising a base plate 1, a floor 2, decorative panels 3, a top plate 4, and door and window frames 5. The base plate 1, floor 2, decorative panels 3, top plate 4, and door and window frames 5 together form the overall structure of the prefabricated outdoor structure. The four corners of the prefabricated outdoor structure are stably supported by support columns 6. The base plate 1 is placed on a horizontal ground, and the top surface of the base plate 1 is covered with floor 2. The front, back, left, and right sides of the prefabricated outdoor structure are assembled by splicing decorative panels 3. Furthermore, the top of the prefabricated outdoor structure is equipped with a top plate 4, and the decorative panel 3 on the front side of the prefabricated outdoor structure is embedded with a door and window frame 5. The decorative panel 3 forms the protective structure around the structure. The floor 2 ensures that the interior of the structure is clean, stable, and allows for natural walking and use. The top plate 4 provides shelter from wind and rain, shade, and blocks debris. The bottom plate 1 provides moisture and impact protection and anchors the position of the structure. The support column 6 supports the structure. The door and window frame 5 provides lighting, ventilation, and sales functions, thus ensuring the practical application effect of the modular commercial outdoor structure.

[0035] The horizontal edges of the base plate 1, floor 2, decorative panel 3, and top plate 4 are all provided with horizontal assembly grooves 7, and the vertical edges are all provided with vertical assembly grooves 8. The stable assembly is achieved by connecting adjacent base plates 1, floor 2, decorative panels 3, and top plates 4 through the cooperation of tensioning assembly strips 9 with the horizontal assembly grooves 7 and vertical assembly grooves 8.

[0036] The tensioning assembly strip 9 has two ends respectively provided with fitting strips 10 that fit tightly into the horizontal assembly groove 7 and the vertical assembly groove 8, and the ends of the fitting strips 10 are glued with extrusion plates 11. The cross-sections of the horizontal assembly groove 7 and the vertical assembly groove 8 are both convex. The tensioning assembly strip 9 and the fitting strips 10 form a structure with convex ends. The extrusion plates 11 at the edge of the fitting strips 10 are in close contact with the inner walls of the horizontal assembly groove 7 and the vertical assembly groove 8. By inserting the tensioning assembly strip 9 and the fitting strips 10 into the corresponding horizontal assembly groove 7 and vertical assembly groove 8, the components of the two modular buildings are aligned and tightened by riveting, ensuring the tightness of the connection between the two components during assembly.

[0037] The two vertical sides of the support column 6 are fixedly connected with column clips 12. The bottom end of the support column 6 is fixedly connected to the top surface of the base plate 1. The base plate 1 is anchored to the ground. The support column 6 is connected to the two vertical mounting slots 8 on the sides of the decorative panel 3 by the two column clips 12 on its sides. The column clips 12 on the sides of the support column 6 facilitate the quick combination and connection between the support column 6 and the decorative panel 3. The support column 6 is used to strengthen the overall support stability of the modular building after assembly. The support column 6 is assembled and connected to the vertical mounting slots 8 on the sides of the decorative panel 3 by the column clips 12 on its side.

[0038] The interior of the base plate 1, floor 2, decorative panel 3, top plate 4, tensioning assembly strip 9, fitting strip 10, and extruded rubber plate 11 are all perforated with through holes 13. The edge of the door and window frame 5 is provided with door and window tensioning holes 20 at the corresponding positions of the through holes 13. The two adjacent base plates 1, floor 2, decorative panel 3, and top plate 4 are all tensioned in the same direction by tensioning steel cables 14. The end of the tensioning steel cable 14 is connected to the inside of the door and window tensioning hole 20 by limiting bolts. By setting the embedded tensioning steel cable 14 inside the modular building, it is convenient to form a tie structure to further enhance the overall connection tightness of the modular building. The tensioning steel cable 14 is connected through the interior of the through holes 13 in the same direction. The interior of the support column 6 and the column clip 12 on its side are provided with through grooves 15 at the corresponding positions of the through holes 13 in the same straight direction. The side of the support column 6 is provided with matching square grooves 16 at the corresponding positions of the through grooves 15 in the same direction.

[0039] The tension cable 14 is provided with a threaded end post 17 at its end, and a fitting square plate 18 is fixedly connected to the edge of the threaded end post 17. A fastening nut 19 is threadedly connected to the outside of the threaded end post 17. The fitting square plate 18 is tightly fitted to the inside of the fitting square groove 16. The tension cable 14 is formed by twisting several steel wires, and the tension cable 14 is tightened and straightened by the fastening nuts 19 at both ends. The fastening nuts 19 facilitate the tightening of the tension cable 14, giving the tension cable 14 a certain degree of flexibility. The fitting square plate 18 provides a large support surface to ensure stability. The fitting square plate 18 is fitted and connected in the fitting square groove 16, ensuring the overall aesthetics of the modular building through an invisible connection.

[0040] The working principle and usage process of this utility model are as follows: In the actual assembly process, it is necessary to first select the laying range, calculate the required number of components such as base plate 1, floor 2, decorative panel 3, top plate 4, door and window frame 5, and support column 6, and clear the land within the range to make it level. Among the various components, the decorative panel 3 forms the protective structure around the structure, the floor 2 ensures that the interior of the structure is clean and stable, and allows for natural walking and use, the top plate 4 has the function of sheltering from wind and rain, shading from the sun and blocking debris, the base plate 1 has the function of moisture-proofing, impact-proofing and anchoring the position of the structure, the support column 6 plays the role of supporting the structure, and the door and window frame 5 has the function of lighting, ventilation and sales, so that the actual application effect of this modular commercial outdoor display is guaranteed.

[0041] First, lay the base plate 1, then lay the floor 2 on it. Select the splicing position of the decorative panel 3 on the floor 2. During the assembly of the base plate 1, floor 2, decorative panel 3, top plate 4 and door and window frame 5, horizontal assembly grooves 7 and vertical assembly grooves 8 are opened in different directions on the sides of the base plate 1, floor 2, decorative panel 3, top plate 4 and door and window frame 5. When assembling them, the tensioning assembly strip 9 and the interlocking clip strip 10 are respectively inserted into the corresponding horizontal assembly groove 7 and vertical assembly groove 8. The components of the two modular buildings are aligned and tightened by riveting to ensure the tightness of the connection between the two components during assembly.

[0042] Meanwhile, by using the extruded adhesive sheet 11, the contact surfaces can be extruded. After the bottom plate 1, floor 2, decorative panel 3, and top plate 4 are assembled, the sealing function provided by the extruded adhesive sheet 11 ensures the overall airtightness of the modular building after assembly. In addition, the column clips 12 on the side of the support column 6 facilitate the quick connection between the support column 6 and the decorative panel 3, thereby strengthening the overall support stability of the modular building after assembly through the support column 6.

[0043] After the initial assembly of the modular building is completed, the tensioning steel cable 14 is inserted through the perforations 13 inside the base plate 1, floor 2, decorative panel 3, top plate 4 and door and window frame 5, combined with the through groove 15. At the same time, the tensioning steel cable 14 is tightened by using the threaded end post 17, the fitting square plate 18 and the fastening nut 19. The overall connection tightness of the modular building is further enhanced by setting the tie structure inside the modular building.

[0044] The supporting surface provided by the mating square plate 18 is large, ensuring stability. The mating square plate 18 is connected in a mating square groove 16, ensuring the overall aesthetics of the modular building through an invisible connection. The door and window tensioning holes 20 facilitate the tensioning of the door and window frame 5 and its adjacent decorative panel 3 through the tensioning steel cable 14, thereby ensuring the stability of the connection of the door and window frame 5.

[0045] Finally, the modular building can be quickly assembled into a mobile commercial outdoor space, maximizing the use of land resources and achieving the goal of rapid construction and cost reduction. At the same time, the components of the modular building can be mass-produced in a standardized manner, ensuring quality. Less construction waste is generated during the construction process, which is energy-saving and environmentally friendly. Moreover, all components are pre-assembled and transported directly to the site for assembly, shortening the assembly construction period and requiring fewer on-site construction personnel, thus saving a lot of labor costs.

[0046] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A modular prefabricated outdoor structure suitable for urban renewal construction, characterized in that: The assembly includes a base plate (1), a floor (2), a decorative panel (3), a top plate (4), and a door and window frame (5). The base plate (1), floor (2), decorative panel (3), top plate (4), and door and window frame (5) together form the overall structure of the prefabricated exterior. The four corners of the prefabricated exterior are stably supported by support columns (6). The base plate (1) is placed on a horizontal ground. The top surface of the base plate (1) is covered with a floor (2). The front, back, left, and right sides of the prefabricated exterior are spliced ​​together by decorative panels (3). The top of the prefabricated exterior is provided with a top plate (4). The decorative panel (3) on the front side of the prefabricated exterior is embedded with a door and window frame (5). The horizontal end edges of the base plate (1), floor (2), decorative panel (3), and top plate (4) are all provided with horizontal assembly grooves (7), and the vertical end edges are all provided with vertical assembly grooves (8). The stable assembly is achieved by connecting adjacent base plates (1), floor (2), decorative panels (3), and top plates (4) with the horizontal assembly grooves (7) and vertical assembly grooves (8) through the cooperation of tensioning assembly strips (9). The two ends of the tensioning assembly strip (9) are respectively provided with fitting strips (10) that are tightly connected to the horizontal assembly groove (7) and the vertical assembly groove (8), and the ends of the fitting strips (10) are bonded with extrusion rubber plates (11). The two vertical sides of the support column (6) are fixedly connected with column clips (12), and the support column (6) is assembled and connected to the vertical mounting groove (8) on the edge of the decorative panel (3) through the column clips (12) at its edge.

2. A modular prefabricated outdoor structure suitable for urban renewal construction according to claim 1, characterized in that: The decorative panels (3) form the surrounding structure of the building. The floor (2) ensures that the interior of the building is clean and stable, and that it is easy to walk and use. The roof (4) provides shelter from wind and rain, shades the sun and blocks debris. The base (1) provides moisture protection, impact protection and anchors the position of the building. The support columns (6) support the building. The door and window frames (5) provide lighting, ventilation and sales.

3. A modular prefabricated outdoor structure suitable for urban renewal construction according to claim 1, characterized in that: The cross-sections of the horizontal assembly groove (7) and the vertical assembly groove (8) are both convex. The tensioning assembly strip (9) and the fitting strip (10) form a structure with protruding ends. The extrusion rubber plate (11) at the edge of the fitting strip (10) is in close contact with the inner wall of the horizontal assembly groove (7) and the vertical assembly groove (8).

4. A modular prefabricated outdoor structure suitable for urban renewal construction according to claim 2, characterized in that: The bottom end of the support column (6) is fixedly connected to the top surface of the base plate (1), the base plate (1) is anchored to the ground, and the support column (6) is connected to the vertical mounting grooves (8) on the sides of the two vertical decorative panels (3) respectively through the two column clips (12) on its side.

5. A modular prefabricated outdoor structure suitable for urban renewal construction according to claim 1, characterized in that: The bottom plate (1), floor (2), decorative panel (3), top plate (4), tensioning assembly strip (9), fitting strip (10) and extrusion board (11) are all perforated (13). The door and window frame (5) is provided with door and window tensioning holes (20) at the position corresponding to the perforation (13) on the side. Tensioning steel cables (14) are connected through the perforation (13) in the same direction. The support column (6) and the column clip (12) on its side are provided with through grooves (15) at the position corresponding to the perforation (13) in the same straight direction. The support column (6) is provided with matching square grooves (16) at the position corresponding to the through groove (15) in the same direction on the side. The end of the tensioning steel cable (14) is provided with a threaded end post (17), and the edge of the threaded end post (17) is fixedly connected with a fitting square plate (18), and the outer side of the threaded end post (17) is connected with a fastening nut (19) by thread.

6. A modular prefabricated outdoor structure suitable for urban renewal construction according to claim 5, characterized in that: The two adjacent bottom plates (1), floor (2), decorative panels (3), and top plates (4) are all tightened in the same direction by tensioning steel cables (14), and the end of the tensioning steel cables (14) is connected to the inside of the door and window tensioning holes (20) by limiting bolts.

7. A modular prefabricated outdoor structure suitable for urban renewal construction according to claim 5, characterized in that: The fitting square plate (18) is tightly fitted to the inner side of the fitting square groove (16), and the tensioning steel cable (14) is formed by twisting several steel wires, and the tensioning steel cable (14) is tightened and straightened by the fastening nuts (19) at both ends.

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