Substation prefabricated enclosing wall with sound insulation function

Abstract

The utility model discloses a transformer substation prefabricated enclosing wall with a sound insulation function, and aims to solve the problems that a traditional transformer substation enclosing wall lacks a sound insulation function and is affected by noise. The transformer substation prefabricated enclosing wall comprises an enclosing wall assembly and a sound insulation assembly, the enclosing wall assembly comprises a foundation, a first stand column, a top beam and a wallboard, the bottom end of the first stand column is fixedly connected with the foundation, the top end of the first stand column is fixedly connected with the top beam, first mounting grooves are formed in the two sides of the stand column, and the end of the wallboard is arranged in the first mounting grooves; the sound insulation assembly comprises a second stand column and a sound absorption screen, second mounting grooves are formed in the two sides of the second stand column, the end of the sound absorption screen is arranged in the second mounting grooves, and the second stand column is arranged at the top of the top beam and fixedly connected with the first stand column. The sound insulation assembly is arranged at the top of the enclosing wall assembly, the sound insulation height is increased, sound waves can be spread out of the enclosing wall assembly from the top of the sound insulation assembly, the horizontal spreading path is weakened through the sound insulation assembly, and noise spreading in the transformer substation is reduced.

Description

Technical Field

[0001] This utility model relates to the field of substation facilities technology, specifically to a prefabricated substation enclosure with sound insulation function. Background Technology

[0002] Substations are a crucial component of power systems, primarily responsible for transforming voltage and current, and serving as key locations for receiving and distributing electrical energy. Substations within power plants are step-up substations, their function being to step up the voltage of the electricity generated by generators before feeding it into the high-voltage power grid. In daily operation, substations require effective protection using multiple perimeter walls to ensure their safe and stable operation and prevent adverse effects from external factors.

[0003] Substations inevitably generate noise during operation. If this noise is not effectively controlled, it can negatively impact the surrounding environment and nearby residents. Traditional substation fences typically only provide isolation and protection, lacking effective sound insulation. With increasing environmental protection requirements and a growing emphasis on residents' quality of life, there is an urgent need for fences that can effectively reduce the transmission of substation noise. Utility Model Content

[0004] The purpose of this utility model is to provide a prefabricated substation enclosure with sound insulation function, which aims to solve the problem of noise impact caused by the lack of sound insulation function in traditional substation enclosures.

[0005] To solve the above problems, this utility model provides a prefabricated substation enclosure with sound insulation function, including an enclosure component and a sound insulation component, wherein the enclosure component and the sound insulation component are fixedly connected, and the sound insulation component is disposed on the top of the enclosure component;

[0006] The wall assembly includes a foundation, a first column, a top beam, and a wall panel. The bottom end of the first column is fixedly connected to the foundation, and the top end of the first column is fixedly connected to the top beam. The column has first mounting grooves on both sides, and the end of the wall panel is disposed in the first mounting groove.

[0007] The sound insulation component includes a second column and a sound-absorbing screen. The second column has second mounting grooves on both sides. The end of the sound-absorbing screen is set in the second mounting groove. The second column is set on the top of the top beam and is fixedly connected to the first column.

[0008] Preferably, a fixing plate is provided in the second mounting groove, the fixing plate is screwed to the second column, the fixing plate abuts against the first surface of the sound-absorbing screen, and the second surface of the sound-absorbing screen abuts against the inner wall of the second mounting groove.

[0009] Preferably, the sound insulation component further includes a buffer member, which includes a first rubber strip and a second rubber strip. One side of the first rubber strip abuts against the fixing plate, and the other side of the first rubber strip abuts against the sound-absorbing screen. One side of the second rubber strip abuts against the inner wall of the second mounting groove, and the other side of the second rubber strip abuts against the sound-absorbing screen.

[0010] Preferably, the sound-absorbing screen includes a housing and sound-absorbing cotton, with the sound-absorbing cotton disposed inside the housing.

[0011] Preferably, the housing is provided with a plurality of louvered holes, which are distributed in a matrix.

[0012] Preferably, the sound insulation component further includes a column cap, which is fixedly connected to the top of the second column and abuts against the sound-absorbing screen.

[0013] Preferably, the sound insulation component further includes a first crossbeam, and the top of the second column is provided with a limiting hole, through which the first crossbeam passes, and the first crossbeam is fixedly connected to the second column.

[0014] Preferably, the sound insulation component further includes a reinforcing member disposed between adjacent second columns, the reinforcing member including a tie rod, a first diagonal brace and a second diagonal brace;

[0015] The tie rod is fixedly connected to the adjacent second column, and the tie rod is perpendicular to the second column. The tie rod, the first crossbeam and the adjacent second column form a rectangular structure. The first diagonal brace connects the first opposite corner of the rectangular structure, and the second diagonal brace connects the second opposite corner of the rectangular structure.

[0016] Preferably, the prefabricated substation enclosure further includes a support assembly, which includes a third column and a first connecting rod. The bottom end of the third column is fixedly connected to the foundation. The third column is located on one side of the first column. The first end of the first connecting rod is fixedly connected to the top end of the third column. The second end of the first connecting rod is fixedly connected to the second column. The second end of the first connecting rod is located at the same horizontal position as the tie rod.

[0017] Preferably, the support assembly further includes a second connecting rod and a second crossbeam, the first end of the second connecting rod being connected to the third column, the second end of the second connecting rod being connected to the first column, the second crossbeam connecting adjacent third columns, and the second connecting rod, the second crossbeam, and the top beam being located at the same horizontal position.

[0018] This design, with sound insulation components installed at the top of the perimeter wall assembly, combined with the inherent sound insulation properties of the wall assembly itself, enhances the overall sound insulation level. Sound waves must propagate from the top of the sound insulation components to the outside of the perimeter wall assembly; by weakening the horizontal propagation path of sound waves through the sound insulation components, the outward propagation of noise from inside the substation is effectively reduced. Furthermore, the structural design of the perimeter wall assembly and sound insulation components facilitates their splicing and installation. Additionally, the first and second columns are fixedly connected, ensuring they are in the same vertical direction. This arrangement improves the connection between the sound insulation components and the perimeter wall assembly, thereby enhancing the overall integrity of the prefabricated substation perimeter wall. It also facilitates load transfer along the first column to the foundation, improving the overall structural stability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a prefabricated substation enclosure structure according to one embodiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of wall panel installation according to one embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of the installation of a sound-absorbing screen according to one embodiment of the present invention;

[0022] Figure 4 This is a cross-sectional view of a sound-absorbing screen according to one embodiment of the present invention;

[0023] Figure 5 This is a front view of a sound-absorbing screen according to one embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the top structure of a sound insulation component according to one embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of a support component structure according to one embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of a prefabricated substation enclosure structure according to another embodiment of the present utility model;

[0027] Figure 9This is a schematic diagram of the top structure of a sound insulation component according to another embodiment of the present invention.

[0028] Figure label:

[0029] 1. Fence components; 11. Foundation; 12. First post; 12a. First mounting slot; 13. Top beam; 14. Wall panel;

[0030] 2. Sound insulation components;

[0031] 21. Second column; 21a. Second mounting groove; 21b. Limiting hole; 211. Fixing plate;

[0032] 22. Sound-absorbing screen; 221. Housing; 221a. Louvers; 222. Sound-absorbing cotton;

[0033] 23. Buffer component; 231. First rubber strip; 232. Second rubber strip;

[0034] 24. Column capital;

[0035] 25. First crossbeam;

[0036] 26. Reinforcing member; 261. Tie rod; 262. First diagonal brace; 263. Second diagonal brace;

[0037] 3. Supporting components; 31. Third column; 32. First connecting rod; 33. Second connecting rod; 34. Second crossbeam. Detailed Implementation

[0038] 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 specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0039] The accompanying drawings show schematic diagrams of layer structures according to embodiments of the present invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0040] Combination Figures 1 to 7This utility model provides a prefabricated substation enclosure with sound insulation function, including enclosure component 1 and sound insulation component 2. Enclosure component 1 and sound insulation component 2 are fixedly connected, and sound insulation component 2 is disposed on the top of enclosure component 1. Enclosure component 1 includes a foundation 11, a first column 12, a top beam 13 and a wall panel 14. The bottom end of the first column 12 is fixedly connected to the foundation 11, and the top end of the first column 12 is fixedly connected to the top beam 13. The column has first mounting grooves 12a on both sides, and the end of the wall panel 14 is disposed in the first mounting grooves 12a. Sound insulation component 2 includes a second column 21 and a sound-absorbing screen 22. The second column 21 has second mounting grooves 21a on both sides, and the end of the sound-absorbing screen 22 is disposed in the second mounting grooves 21a. The second column 21 is disposed on the top of the top beam 13, and the second column 21 is fixedly connected to the first column 12. The foundation 11 provides stable support for the entire perimeter wall. The first column 12 and the top beam 13 form the frame of the perimeter wall, bearing the weight of the wall panel 14 and external loads. The wall panel 14 serves as an isolation and protection unit. The second column 21 supports the sound-absorbing screen 22, positioning it at a suitable height for better sound insulation. The sound-absorbing screen 22 absorbs noise generated by the substation. With this setup, the sound insulation component 2 is installed on top of the perimeter wall assembly 1. Combined with the inherent sound insulation properties of the perimeter wall assembly 1, this enhances the sound insulation effect. Sound waves need to propagate from the top of the sound insulation component to the outside of the perimeter wall assembly 1. By weakening the horizontal propagation path of sound waves through the sound insulation component, the outward propagation of noise from inside the substation is effectively reduced. Meanwhile, by designing the structure of the wall component 1 and the sound insulation component, it is easier to splice and install the wall component 1 and the sound insulation component. Furthermore, the first column 12 and the second column 21 are fixedly connected, that is, the first column 12 and the second column 21 are in the same vertical direction. Through this setting, the connection relationship between the sound insulation component and the wall component 1 is improved, thereby improving the overall integrity of the prefabricated wall of the substation. In terms of load transmission, it is also more conducive to the sound insulation component being transmitted to the foundation 11 along the first column 12, thereby improving the stability of the overall structure.

[0041] The specific structure of the first post 12 in the fence assembly 1 is not limited here; in optional cases, such as... Figure 1 and Figure 2As shown, when the overall height of the prefabricated wall is relatively high, in order to ensure the overall structural strength of the prefabricated wall, the first column 12 is an H-shaped steel column. A GRC (Glass Reinforced Concrete) panel is installed on the outside of the H-shaped steel, and the H-shaped steel is wrapped with the GRC panel to form the first column 12. The GRC panel uses low-alkalinity cement mortar as the base material and alkali-resistant glass fiber as the reinforcing material to form the surface layer, and is filled with an insulating core. Due to the composite structure of the GRC surface layer and the high thermal resistance core material, the GRC composite wall panel 14 has high strength, high toughness, high impermeability, high fire resistance, and high weather resistance, and also has good thermal insulation and sound insulation performance. It should be noted that the connection method between the GRC panel and the H-shaped steel is not limited here. Optionally, connecting bolts and small steel plates welded to the H-shaped steel for bolt installation can be used to achieve a fixed connection between the GRC panel and the H-shaped steel.

[0042] The specific connection method between the wall panel 14 and the first column 12 is not limited here. It can be that during the installation of the GRC panel, a first mounting groove 12a is formed on the side of the column, and the end of the wall panel 14 is installed and limited along the top of the first column 12 through the first mounting groove 12a. In a preferred embodiment, such as... Figure 2 As shown, the web of the H-beam is perpendicular to the wall panel 14. Channel steel is installed on both sides of the H-beam, clamping the wall panel 14 to fix its ends. The specific connection method between the channel steel and the H-beam is not limited; it can be welding or bolted. Preferably, bolted connections are used, which facilitates assembly and disassembly of the structure and improves resource recycling rates.

[0043] The specific connection method of the first column 12 and the second column 21 is not limited here. In optional cases, when the first column 12 is made of H-beams, the second column 21 is also made of H-beams. In this case, the first column 12 and the second column 21 can be continuous H-beams, or two H-beams can be butt-jointed and fixed to form the first column 12 and the second column 21.

[0044] In a preferred embodiment, a fixing plate 211 is provided within the second mounting groove 21a. The fixing plate 211 is screwed to the second column 21, and abuts against the first surface of the sound-absorbing screen 22. The second surface of the sound-absorbing screen 22 abuts against the inner wall of the second mounting groove 21a. Specifically, the fixing plate 211 is made of L-shaped steel plate. One side of the fixing plate 211 is fitted with the web of the H-shaped steel in the second column 21 and fixed with bolts. The other side of the fixing plate 211 abuts against the sound-absorbing screen 22 and forms a second mounting groove 21a with the inner side of one flange of the H-shaped steel, thereby fixing the sound-absorbing screen 22 within the second mounting groove 21a and preventing the sound-absorbing screen 22 from loosening or shifting.

[0045] In a preferred embodiment, the sound insulation component 2 further includes a buffer member 23, which comprises a first rubber strip 231 and a second rubber strip 232. One side of the first rubber strip 231 abuts against the fixing plate 211, and the other side abuts against the sound-absorbing screen 22. One side of the second rubber strip 232 abuts against the inner wall of the second mounting groove 21a, and the other side abuts against the sound-absorbing screen 22. The first rubber strip 231 acts as a buffer between the fixing plate 211 and the sound-absorbing screen 22, reducing the pressure of the fixing plate 211 on the sound-absorbing screen 22. The second rubber strip 232 acts as a buffer between the sound-absorbing screen 22 and the inner wall of the second mounting groove 21a. Simultaneously, the first rubber strip 231 and the second rubber strip 232 also provide a sealing effect, preventing sound leakage from gaps and thus improving the sound insulation effect. The specific fixing method of the sound insulation component 2 is not limited here; it can be glued to the ends of both sides of the sound-absorbing screen 22.

[0046] It should be noted that the specific structure of the sound-absorbing screen 22 is not limited here, as long as it can be installed between the second columns 21 and achieves a sound insulation effect. In a preferred embodiment, the sound-absorbing screen 22 includes a housing 221 and sound-absorbing cotton 222, with the sound-absorbing cotton 222 disposed inside the housing 221. The housing 221 serves to protect the sound-absorbing cotton 222 and can also initially reflect and guide sound. The sound-absorbing cotton 222 is used to absorb sound entering the housing 221. This arrangement can effectively reduce sound reflection and propagation, improving the overall sound insulation effect. The specific installation method of the sound-absorbing cotton 222 is not limited here. It can be that fixing protrusions are provided on both sides of the inner wall of the housing 221 to clamp and fix the sound-absorbing cotton 222, preventing it from moving and ensuring the sound insulation effect. Furthermore, the housing 221 is provided with multiple louvered holes 221a, which are distributed in a matrix. Under normal circumstances, the sound-absorbing cotton 222 can effectively prevent noise from spreading outward in the substation. The louvered holes 221a on the shell 221 allow sound to enter the sound-absorbing screen 22, so that the sound-absorbing cotton 222 can absorb the sound. On the other hand, the louvered holes 221a can reduce the lateral wind load of the sound-absorbing screen 22 and improve the overall stability of the structure.

[0047] like Figure 3As shown, in a preferred embodiment, the sound insulation component 2 further includes a first crossbeam 25, and a limiting hole 21b is provided at the top of the second column 21. The first crossbeam 25 passes through the limiting hole 21b and is fixedly connected to the second column 21. The first crossbeam 25 passing through the limiting hole 21b at the top of the second column 21 and being fixedly connected to the second column 21 enhances the lateral stability of the sound insulation component 2. This arrangement improves the overall strength of the sound insulation component 2, prevents the second column 21 from tilting or deforming under external force, and ensures the normal operation of the sound-absorbing screen 22. The specific shape of the limiting hole 21b is not limited here; it can be a shape adapted to the first crossbeam 25. For example, if the first crossbeam 25 is made of H-beam, the limiting hole 21b can be an H-shaped hole adapted to the H-beam, or a rectangular opening, as long as it allows the first crossbeam 25 to pass through and be fixedly connected to the second column 21.

[0048] like Figures 1 to 7 As shown, in a preferred embodiment, the sound insulation component 2 further includes a reinforcing member 26, which is disposed between adjacent second columns 21. The reinforcing member 26 includes a tie rod 261, a first diagonal brace 262, and a second diagonal brace 263. The tie rod 261 is fixedly connected to the adjacent second column 21 and is perpendicular to the second column 21. The tie rod 261, the first crossbeam 25, and the adjacent second column 21 form a rectangular structure. The first diagonal brace 262 connects the first diagonal of the rectangular structure, and the second diagonal brace 263 connects the second diagonal of the rectangular structure. Specifically, the tie rod 261 connects the adjacent second column 21 to ensure the distance and stability between adjacent columns. The first diagonal brace 262 and the second diagonal brace 263 provide diagonal support for the rectangular structure formed by the tie rod 261, the first crossbeam 25, and the adjacent second column 21, enhancing the structure's resistance to deformation. This arrangement greatly improves the overall stability of the sound insulation component 2, enabling it to withstand greater external forces and ensuring normal operation and good sound insulation performance even in harsh environments.

[0049] In a preferred embodiment, the prefabricated substation enclosure also includes a support assembly 3. The support assembly 3 includes a third column 31 and a first connecting rod 32. The bottom end of the third column 31 is fixedly connected to the foundation 11. The third column 31 is located on one side of the first column 12. The first end of the first connecting rod 32 is fixedly connected to the top end of the third column 31, and the second end of the first connecting rod 32 is fixedly connected to the second column 21. The second end of the first connecting rod 32 is at the same horizontal position as the tie rod 261. Specifically, the third column 31 is located on the side of the first column 12 closest to the substation, and the third column 31 and the first column 12 are correspondingly arranged, meaning that a third column 31 is provided on one side of each first column 12. The first connecting rod 32 connects the third column 31 and the second column 21, transferring the supporting force of the third column 31 to the second column 21, thus assisting in supporting the sound insulation assembly 2. With this setup, the support component 3 enhances the connection stability between the sound insulation component 2 and the foundation 11, further improving the overall load-bearing capacity of the wall structure in the vertical direction and ensuring that the sound insulation component 2 will not sink or deform during long-term use.

[0050] In a preferred embodiment, the support assembly 3 further includes a second connecting rod 33 and a second crossbeam 34. The first end of the second connecting rod 33 is connected to the third column 31, and the second end of the second connecting rod 33 is connected to the first column 12. The second crossbeam 34 connects to the adjacent third column 31. The second connecting rod 33, the second crossbeam 34, and the top beam 13 are located at the same horizontal level. Specifically, the second connecting rod 33 connects the third column 31 and the first column 12, and the second crossbeam 34 connects to the adjacent third column 31, together forming an auxiliary support system.

[0051] like Figure 8 and Figure 9 As shown, when the overall height of the prefabricated wall is relatively low, the first column 12 adopts a reinforced concrete structure, with bolts installed at the top of the first column 12. The second column 21 adopts H-beams and is fixedly connected to the first column 12 by bolts. In a preferred embodiment, a column cap 4 is installed at the top of the second column 21, which abuts against the top layer of the sound-absorbing screen 22, protecting the tops of the second column 21 and the sound-absorbing screen 22, preventing rainwater from entering the connection between the second column 21 and the sound-absorbing screen 22, extending the service life of the components, and improving the aesthetic appearance of the wall. The installation of the sound-absorbing screen 22 is the same as the structure described above, and will not be repeated here.

[0052] It should be noted that the above structures are not limited to specific models, specifications, or materials, as long as they can achieve the corresponding functions.

[0053] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A prefabricated enclosure wall for a substation with sound insulation function, characterized in that, The prefabricated wall of the substation includes a wall assembly (1) and a sound insulation assembly (2). The wall assembly (1) is fixedly connected to the sound insulation assembly (2), and the sound insulation assembly (2) is disposed on the top of the wall assembly (1). The wall assembly (1) includes a foundation (11), a first column (12), a top beam (13), and a wall panel (14). The bottom end of the first column (12) is fixedly connected to the foundation (11), and the top end of the first column (12) is fixedly connected to the top beam (13). The column has a first mounting groove (12a) on both sides, and the end of the wall panel (14) is located in the first mounting groove (12a). The sound insulation component (2) includes a second column (21) and a sound-absorbing screen (22). The second column (21) has a second mounting groove (21a) on both sides. The end of the sound-absorbing screen (22) is located in the second mounting groove (21a). The second column (21) is located on the top of the top beam (13). The second column (21) is fixedly connected to the first column (12).

2. The prefabricated enclosure of a substation according to claim 1, characterized in that, The second mounting groove (21a) is provided with a fixing plate (211), the fixing plate (211) is screwed to the second column (21), the fixing plate (211) abuts against the first surface of the sound-absorbing screen (22), and the second surface of the sound-absorbing screen (22) abuts against the inner wall of the second mounting groove (21a).

3. The prefabricated enclosure of a substation according to claim 2, characterized in that, The sound insulation component (2) further includes a buffer component (23), which includes a first rubber strip (231) and a second rubber strip (232). One side of the first rubber strip (231) abuts against the fixing plate (211), and the other side of the first rubber strip (231) abuts against the sound-absorbing screen (22). One side of the second rubber strip (232) abuts against the inner wall of the second mounting groove (21a), and the other side of the second rubber strip (232) abuts against the sound-absorbing screen (22).

4. The prefabricated enclosure of a substation according to claim 3, characterized in that, The sound-absorbing screen (22) includes a housing (221) and sound-absorbing cotton (222), and the sound-absorbing cotton (222) is disposed inside the housing (221).

5. The prefabricated enclosure of a substation according to claim 4, characterized in that, The housing (221) is provided with a plurality of louvered holes (221a), which are arranged in a matrix.

6. The prefabricated enclosure of a substation according to claim 5, characterized in that, The sound insulation component (2) also includes a column cap (24), which is fixedly connected to the top of the second column (21) and abuts against the sound-absorbing screen (22).

7. The prefabricated substation enclosure wall according to claim 5, characterized in that, The sound insulation component (2) also includes a first crossbeam (25), and the top of the second column (21) is provided with a limiting hole (21b). The first crossbeam (25) passes through the limiting hole (21b) and is fixedly connected to the second column (21).

8. The prefabricated enclosure of a substation according to claim 7, characterized in that, The sound insulation component (2) further includes a reinforcing member (26), which is disposed between adjacent second columns (21). The reinforcing member (26) includes a tie rod (261), a first diagonal brace (262), and a second diagonal brace (263). The tie rod (261) is fixedly connected to the adjacent second column (21). The tie rod (261) is perpendicular to the second column (21). The tie rod (261), the first crossbeam (25) and the adjacent second column (21) form a rectangular structure. The first diagonal brace (262) connects the first opposite corner of the rectangular structure, and the second diagonal brace (263) connects the second opposite corner of the rectangular structure.

9. The prefabricated enclosure of a substation according to claim 8, characterized in that, The prefabricated enclosure wall of the substation also includes a support component (3), which includes a third column (31) and a first connecting rod (32). The bottom end of the third column (31) is fixedly connected to the foundation (11). The third column (31) is located on one side of the first column (12). The first end of the first connecting rod (32) is fixedly connected to the top end of the third column (31). The second end of the first connecting rod (32) is fixedly connected to the second column (21). The second end of the first connecting rod (32) is located at the same horizontal position as the tie rod (261).

10. The prefabricated enclosure of a substation according to claim 9, characterized in that, The support assembly (3) further includes a second connecting rod (33) and a second crossbeam (34). The first end of the second connecting rod (33) is connected to the third column (31), and the second end of the second connecting rod (33) is connected to the first column (12). The second crossbeam (34) connects to the adjacent third column (31). The second connecting rod (33), the second crossbeam (34), and the top beam (13) are located at the same horizontal position.

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