A plug-in temporary stand

Abstract

The utility model provides a kind of plug-in temporary stand, including main truss, secondary truss and multiple rows of interval arrangement support pole group, support pole group includes multiple vertical columns being spaced apart along linear direction, two main trusses between adjacent are connected by plug-in structure, plug-in structure includes the vertical insertion pole being arranged in the one end of main truss, the upper end of vertical insertion pole is provided with plug-in post, its lower end is provided with first sleeve, the upper end of vertical column is inserted in first sleeve;The lower end of main truss is provided with the second sleeve being adapted with plug-in post on the side away from first sleeve;Secondary truss is installed between two main trusses by lug structure, lug structure includes lug being fixed on the upper end of secondary truss two sides symmetrically, the vertical square tube of main truss has square tube mouth above, lug is hooked in square tube mouth;A kind of plug-in temporary stand provided by the utility model, overcome the defects that the assembly efficiency of existing temporary stand is low, structure is complex and processing technology is complex.

Description

Technical Field

[0001] This utility model relates to the field of temporary grandstand technology, specifically to a plug-in temporary grandstand. Background Technology

[0002] Fixed grandstands are a common spectator facility for various sporting events, cultural performances, and large gatherings. However, fixed grandstands have drawbacks such as high construction costs and low utilization rates. Therefore, temporary grandstands that can be assembled and disassembled have emerged and are gradually being widely promoted and applied.

[0003] For example, patent number CN213539853U discloses a modular temporary grandstand that is easy to assemble and disassemble. Two adjacent main trusses are fixedly connected by connecting plates. Multiple connecting holes are evenly spaced along a straight line on the connecting plates. Main beam pins pass through these connecting holes to fix the corresponding overlapping components and connecting parts. The main truss includes a triangular frame and multiple supporting components. A stepped frame is provided on the inclined surface of the triangular frame. Secondary trusses are installed between adjacent rows of corresponding main trusses. Slots are provided on the main trusses, and plug-in columns that mate with the slots are provided on the secondary trusses. Railings are fixed around the support frame, and the bottom of the railings is fixedly connected to the main and secondary trusses.

[0004] The above structure has the following drawbacks: 1) The connection between two adjacent main trusses is made by connecting plates, which is inconvenient to install and affects assembly efficiency; 2) The main trusses use a triangular frame with stepped frames, which is complex, uses a large amount of steel, and has high material costs; 3) The secondary trusses and the main trusses are connected by plug-in columns. On the one hand, due to the small size of the slots, it is difficult to insert the plug-in columns into the slots during installation, which is inconvenient; on the other hand, during processing, it is necessary to first weld the slot seats on the side of the main truss and then drill the slots on the slot seats. The secondary trusses need to be drilled first and then the plug-in columns are welded. The structure and process are more complex, the slots have higher precision requirements, and the processing is more difficult; 4) The outer frame of the railing structure needs to be bent before welding, which is a complex processing technology. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of this, the present invention provides a plug-in temporary grandstand, which overcomes the shortcomings of existing temporary grandstands, such as low assembly efficiency, complex main truss structure and high material cost, as well as complex processing technology of main truss, secondary truss and railing.

[0007] (II) Technical Solution

[0008] To solve the aforementioned technical problem, this utility model provides a plug-in temporary grandstand, comprising a main truss, a secondary truss, and multiple rows of spaced support rods. Each support rod group includes multiple vertical columns spaced along a straight line. Adjacent main trusses are connected by a plug-in structure. The plug-in structure includes a vertical insertion rod at one end of the main truss, with an insertion post at the upper end and a first sleeve at the lower end. The upper end of the vertical column is inserted into the first sleeve. At the lower end of the main truss, on the side away from the first sleeve, a second sleeve adapted to the insertion post is provided. The secondary truss is installed between the two main trusses via a lug structure. The lug structure includes lugs symmetrically fixed on both sides of the upper end of the secondary truss. The main truss has a square tube opening above its vertical square tube, and the lug hooks are attached to the square tube opening.

[0009] In some embodiments, the main truss includes a bottom crossbar and a plurality of vertical square tubes fixed to the bottom crossbar with progressively increasing heights. The vertical insert rod passes through one end of the bottom crossbar, and the second sleeve is fixed to the other end of the bottom crossbar. A transverse support rod is fixed between two adjacent vertical square tubes, and the plurality of transverse support rods are arranged in a stepped manner.

[0010] In some embodiments, an oblique support rod is installed between two adjacent vertical square tubes, and a horizontal support rod and an oblique support rod are installed between the vertical insert rod and the adjacent vertical square tube; and / or, a vertical support rod is installed between the horizontal support rod and the bottom crossbar.

[0011] In some embodiments, the secondary truss includes a rectangular frame, with angle steel plates fixed to both sides of the upper end of the rectangular frame to form the hanging lugs. The hanging lugs are L-shaped and bent downwards. A central support rod is provided in the middle of the rectangular frame, and angle steel rods are symmetrically arranged on both sides of the central support rod. Both the central support rod and the angle steel rods are located inside the rectangular frame.

[0012] In some embodiments, the main truss is stepped, and a fence is fixed on the stepped platform of the main truss; the fence includes a rectangular outer frame formed by splicing multiple square tubes, and connecting rods are symmetrically arranged at the bottom of the rectangular outer frame. The connecting rods are connected to the main truss by multiple pins; the vertical insert rods and the vertical square tubes are provided with connecting seats for connecting to the connecting rods.

[0013] In some embodiments, multiple round tubes are installed at intervals along a straight line inside the rectangular outer frame, and the rectangular outer frame is provided with insertion holes for inserting the round tubes; decorative cover plates are installed on both sides of the upper end of the rectangular outer frame.

[0014] In some embodiments, a first support plate is provided on one side of the upper end of the secondary truss, and a second support plate is provided on the other side of its lower end. The first support plate and the second support plate are used to support the platform. A U-shaped snap-fit ​​is fixed on the stepped platform of the main truss, and the U-shaped snap-fit ​​is used to snap the platform.

[0015] In some embodiments, a horizontal tie rod and / or a diagonal tie rod are installed between two adjacent vertical columns and between the vertical column and the vertical insert rod. A chuck is installed on the vertical column and the vertical insert rod. The ends of the horizontal tie rod and the diagonal tie rod are respectively hinged to a hinge block, and the hinge block is installed on the corresponding chuck by a wedge.

[0016] In some embodiments, the vertical column is a cylindrical steel pipe, and the lower end of the vertical column is equipped with an adjusting foot for adjusting the height; the vertical column is inserted into the first sleeve and fixed by a first pin; the insertion column is inserted into the corresponding second sleeve and fixed by a second pin.

[0017] In some embodiments, an end truss is further included, wherein a boss is provided on the upper side of one end of the end truss, a seat is fixed to one end of the boss, and a back rail is installed at the other end.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least:

[0020] 1) Adjacent main trusses are connected by a plug-in structure. The plug-in column at one end of the vertical plug-in rod is plugged into the second sleeve of another main truss, and the vertical column is plugged into the first sleeve. Compared with the traditional connection method using connecting plates and beam pins, no additional parts are needed for connection. During installation, they can be directly plugged in and fixed with pins, making the operation simpler and greatly improving assembly efficiency. The main truss uses bottom horizontal bars and multiple vertical square tubes with progressively increasing heights, which are connected into a stepped shape by horizontal support rods, etc. Compared with the traditional triangular frame with stepped frame structure, it simplifies the inclined beam structure of the triangular frame, optimizes the structure while meeting the usage specifications, reduces the amount of steel used, and lowers material costs.

[0021] 2) The secondary truss is installed between the two main trusses through a lug structure. The lugs are L-shaped and hook onto the square tube opening above the vertical square tube of the main truss. This avoids the problem of inserting the plug into the narrow slot, making the installation of the secondary truss more convenient and further improving the assembly speed. The main truss does not need to weld the slot seat first and then drill holes to process the slot, and the secondary truss does not need to drill holes and weld the plug, which reduces the processing difficulty and the requirements for slot precision. The overall processing technology is optimized, saving processing costs and time.

[0022] 3) The connecting rods symmetrically arranged at the bottom of the rectangular outer frame of the fence are connected to the main truss through multiple pins. The pin connection method is simple to operate and helps to improve the assembly efficiency of the temporary grandstand module. The fence is formed by welding square tubes to form a rectangular outer frame. Compared with the complex process of bending and welding the outer frame of traditional railings, the square tube welding process is simpler and more direct, without the need for bending. It is also simpler and more convenient to punch holes in the square tubes. The process is simple and less difficult, which improves production efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a simplified structural diagram of a plug-in temporary grandstand according to this utility model;

[0025] Figure 2 This is a schematic diagram of the connection between two adjacent main trusses in a plug-in temporary grandstand according to this utility model;

[0026] Figure 3 This is a schematic diagram of the connection between the main truss and vertical columns in a plug-in temporary grandstand according to this utility model.

[0027] Figure 4 This is a perspective view of the connection between the main truss, secondary truss, vertical columns, and fence in a plug-in temporary grandstand according to this utility model.

[0028] Figure 5 This is an exploded view of the main truss, secondary truss, vertical columns, and railing of a plug-in temporary grandstand according to this utility model.

[0029] Figure 6 This is a perspective view of a plug-in temporary grandstand hanging ear structure according to this utility model;

[0030] Figure 7 This is a perspective view of the main truss of a plug-in temporary grandstand according to this utility model;

[0031] Figure 8 This is a perspective view of a secondary truss in a plug-in temporary grandstand according to this utility model;

[0032] Figure 9 This is a perspective view of the connection between the main truss and the fence in a plug-in temporary grandstand according to this utility model;

[0033] Figure 10 This is a three-dimensional view of a plug-in temporary grandstand railing according to this utility model;

[0034] Figure 11 This is a simplified schematic diagram of the connection between the main truss, secondary truss, and platform in a plug-in temporary grandstand according to this utility model.

[0035] Figure 12 This is a perspective view of the connection between the clamp, horizontal tie rod and diagonal tie rod in a plug-in temporary grandstand according to this utility model;

[0036] Figure 13 This is a structural schematic diagram of a plug-in temporary grandstand end truss according to the present invention;

[0037] The component names corresponding to the various labels in the attached figures are: 1. Main truss; 11. Vertical insert rod; 111. Inserted column; 112. First sleeve; 12. Second sleeve; 13. Vertical square tube; 131. Square tube opening; 14. Bottom crossbar; 15. Horizontal support rod; 16. Diagonal support rod; 17. Vertical support rod; 18. Connecting seat; 19. U 1. Shaped clip connector; 2. Secondary truss; 21. Hanging lug; 22. Rectangular frame; 23. Intermediate support rod; 24. Angle steel rod; 25. First support plate; 26. Second support plate; 3. Vertical column; 31. Horizontal tie rod; 32. Diagonal tie rod; 33. Chuck; 34. Hinge block; 4. Fence; 41. Rectangular outer frame; 42. Connecting rod; 43. Round tube; 44. Insertion hole; 45. Decorative cover plate; 5. Tabletop; 6. Adjustable foot; 7. End truss; 71. Boss. Detailed Implementation

[0038] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0039] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0041] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0042] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0043] Combination Figures 1-13 As shown, this utility model provides a plug-in temporary grandstand, including multiple main trusses 1, multiple secondary trusses 2, and multiple rows of spaced support rods. The support rods include multiple vertical columns 3 spaced along a straight line.

[0044] See Figures 1 to 3Two adjacent main trusses 1 are connected by a plug-in structure. The plug-in structure includes a vertical plug-in rod 11 at one end of the main truss 1, a plug-in post 111 at the upper end of the vertical plug-in rod 11, and a first sleeve 112 at the lower end of the vertical plug-in rod 11. The upper end of the vertical column 3 is plugged into the first sleeve 112, and the upper end of the vertical column 3 is provided with a plug-in post adapted to the first sleeve 112. At the lower end of the main truss 1, on the side away from the first sleeve 112, a second sleeve 12 adapted to the plug-in post 111 is provided. In two adjacent main trusses 1, the plug-in post 111 of one main truss 1 can be plugged into the second sleeve 12 of the other main truss 1. To ensure the stability of the connection, the vertical column 3 is inserted into the first sleeve 112 and then fixed with the first pin. The plug-in column 111 is inserted into the corresponding second sleeve 12 and then fixed with the second pin. This prevents the plug-in column and the sleeve from separating, ensuring a stable and reliable connection. In this structure, adjacent main trusses are connected by a plug-in structure. The plug-in column at one end of the vertical plug-in rod is plugged into the second sleeve of another main truss, and the vertical column is plugged into the first sleeve. Compared with the traditional connection method using connecting plates and beam pins, no additional components are needed for connection. During installation, it can be directly plugged in and fixed with pins, making the operation simpler and greatly improving assembly efficiency.

[0045] See Figures 4 to 6 The secondary truss 2 is installed between the two main trusses 1 via a lug structure. The lug structure includes lugs 21 symmetrically fixed to both sides of the upper end of the secondary truss 2. The main truss 1 has a square tube opening 131 above its vertical square tube 13, and the lugs 21 hook onto the square tube opening 131. In this structure, the secondary truss is installed between the two main trusses via the lug structure. The lugs are L-shaped and hook onto the square tube opening above the vertical square tube of the main truss, avoiding the problem of inserting the plug into a narrow slot, making the installation of the secondary truss more convenient and further improving assembly speed. By utilizing the square tube opening 131 of the main truss components and connecting it to the lugs 21, there is no need to weld slot seats onto the main truss before drilling holes to process the slots, and the secondary truss also does not need to drill holes before welding plug-in columns. This reduces processing difficulty and the requirements for slot precision, optimizing the overall processing technology and saving processing costs and time.

[0046] In some embodiments, such as Figure 7As shown, the main truss 1 includes a bottom horizontal bar 14 and multiple vertical square tubes 13 fixed to the bottom horizontal bar 14 with progressively increasing heights. A vertical insert rod 11 passes through one end of the bottom horizontal bar 14, and a second sleeve 12 is fixed to the other end of the bottom horizontal bar 14. A transverse support rod 15 is fixed between adjacent vertical square tubes 13, and the multiple transverse support rods 15 are arranged in a stepped manner. An oblique support rod 16 is installed between adjacent vertical square tubes 13, and transverse support rods 15 and oblique support rods 16 are installed between the vertical insert rod 11 and its adjacent vertical square tube 13; and / or, a vertical support rod 17 is installed between the transverse support rod 15 and the bottom horizontal bar 14. This structure uses a bottom horizontal bar and multiple vertical square tubes with progressively increasing heights as the main truss, connected by horizontal support rods to form a stepped shape. Compared to the traditional triangular frame structure with stepped frames, this simplifies the inclined beam structure of the triangular frame, optimizes the structure while complying with usage specifications, reduces the amount of steel used, and lowers material costs.

[0047] In this embodiment, there are three vertical square tubes and three horizontal support rods. A diagonal support rod is installed between the second vertical square tube (counting from right to left) and the third vertical square tube, and a diagonal support rod is installed between the third vertical square tube and the vertical insert rod. A vertical support rod is installed between the first horizontal support rod (the lowest in height) and the bottom horizontal bar. Through the cooperation of the diagonal support rods and the horizontal support rods, the main truss can form a stable support system, which enhances the overall load-bearing capacity of the temporary grandstand.

[0048] In some embodiments, such as Figure 8 As shown, the secondary truss 2 includes a rectangular frame 22, which is formed by welding multiple square tubes. Angle steel plates are fixed to both sides of the upper end of the rectangular frame 22 to form lugs 21. The lugs 21 are L-shaped and bent downwards, and are formed by welding angle steel plates, which is convenient for processing. A central support rod 23 is provided in the middle of the rectangular frame 22, and angle steel rods 24 are symmetrically arranged on both sides of the central support rod 23. Both the central support rod 23 and the angle steel rods 24 are located inside the rectangular frame 22. Through the cooperation of the central support rod 23 and the angle steel rods 24, this internal support structure effectively enhances the overall strength and stability of the secondary truss, ensuring that it is not easily deformed or damaged when bearing the weight of the audience and other external forces.

[0049] In some embodiments, such as Figure 9 and Figure 10As shown, the main truss 1 is stepped, and a fence 4 is fixed on the stepped platform of the main truss 1. The fence 4 includes a rectangular outer frame 41 formed by splicing multiple square tubes. Connecting rods 42 are symmetrically arranged at the bottom of the rectangular outer frame 41, and the connecting rods 42 are connected to the main truss 1 by multiple pins. Connecting seats 18 for connecting to the connecting rods 42 are provided on the vertical insert rods 11 and the vertical square tubes 13. Multiple round tubes 43 are installed at intervals along the straight direction inside the rectangular outer frame 41, and the rectangular outer frame 41 is provided with insertion holes 44 for inserting the round tubes 43. Decorative cover plates 45 are installed on both sides of the upper end of the rectangular outer frame 41. In this structure, the connecting rods symmetrically arranged at the bottom of the rectangular outer frame of the fence are connected to the main truss through multiple pins. The pin connection method is simple to operate and helps to improve the assembly efficiency of the temporary grandstand module. The fence is formed by welding square tubes to form a rectangular outer frame. Compared with the complex process of bending and welding round tubes for the outer frame of traditional railings, the square tube welding process is simpler and more direct, without the need for bending. The process is simple and the processing difficulty is low.

[0050] In this embodiment, three railings are installed on the main truss 1, and each connecting rod is connected to the main truss by two pins. Since the distance between the first transverse support rod (counting from right to left) and the bottom crossbar is small, the connecting rod is connected to the bottom crossbar and the transverse support rod; since the distance between the other two transverse support rods and the bottom crossbar is large, connecting seats need to be added, and the connecting rods are connected to the transverse support rods and the connecting seats.

[0051] In some embodiments, such as Figure 4 , Figure 7 , Figure 8 and Figure 11 As shown, a first support plate 25 is provided on one side of the upper end of the secondary truss 2, and a second support plate 26 is provided on the other side of its lower end. The first support plate 25 and the second support plate 26 are used to support the platform 5. When installing the platform, the platform is supported between the main truss, the first support plate 25 of the current secondary truss, and the second support plate of the next secondary truss. A U-shaped snap-fit ​​19 is fixed on the stepped platform of the main truss 1. The U-shaped snap-fit ​​19 is used to snap the platform 5 and to snap the frame of the platform to limit its movement, preventing the platform from shifting and ensuring structural stability.

[0052] In some embodiments, such as Figure 1 , Figure 4 and Figure 12As shown, the vertical column 3 is a cylindrical steel pipe, and an adjusting foot 6 for height adjustment is installed at the lower end of the vertical column 3. Horizontal tie rods 31 and / or diagonal tie rods 32 are installed between adjacent vertical columns 3 and between vertical columns 3 and vertical insert rods 11. Chucks 33 are installed on the vertical columns 3 and vertical insert rods 11. Hinges 34 are hinged to the ends of the horizontal tie rods 31 and diagonal tie rods 32, respectively, and the hinge blocks 34 are mounted on the corresponding chucks 33 by wedges. This structure, where adjacent vertical columns are connected to the vertical insert rods 11 by horizontal tie rods and / or diagonal tie rods, and hinge blocks are installed by chucks and wedges, ensures both ease of assembly and disassembly and the stability of the entire temporary grandstand structure.

[0053] In some embodiments, such as Figure 1 , Figure 4 and Figure 13 As shown, it also includes an end truss 7, whose structure is similar to that of the main truss 1. The end truss 7 has vertical insert rods 11, a first sleeve 112, a second sleeve 12, a vertical square tube 13, a bottom crossbar 14, and a transverse support rod 15. Because the end truss 7 is located at the end, there is no need to install a connecting column at the upper end of the vertical insert rods 11. In addition, a boss 71 is provided on the upper side of one end of the end truss 7. A seat (elliptical dashed line in the figure) is fixed to one end of the boss 71, and a back rail (rectangular dashed line in the figure) is installed on the other end. In this structure, the end truss 7 has a boss 71, and a secondary truss can be installed between two adjacent rows of corresponding bosses 71. The back rail is installed on the secondary truss, which facilitates the installation of the back rail and ensures safety during use. Furthermore, the setting of the boss 71 can add an extra row of seats, which can accommodate more audience members and improve the usage effect.

[0054] In this specification, the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the descriptions of the embodiments described later are relatively simple, and relevant parts can be referred to the descriptions of the foregoing embodiments.

[0055] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A plug-in temporary grandstand, comprising a main truss (1), a secondary truss (2), and multiple rows of spaced support rods, wherein the support rods include multiple vertical columns (3) spaced along a straight line, characterized in that: Two adjacent main trusses (1) are connected by a plug-in structure. The plug-in structure includes a vertical plug-in rod (11) set at one end of the main truss (1). The upper end of the vertical plug-in rod (11) is provided with a plug-in column (111) and the lower end is provided with a first sleeve (112). The upper end of the vertical column (3) is inserted into the first sleeve (112). The lower end of the main truss (1) is provided with a second sleeve (12) adapted to the plug-in column (111) on the side away from the first sleeve (112). The secondary truss (2) is installed between the two main trusses (1) by a lug structure. The lug structure includes lugs (21) symmetrically fixed on both sides of the upper end of the secondary truss (2). The main truss (1) has a square tube opening (131) above the vertical square tube (13). The lugs (21) are hooked at the square tube opening (131).

2. The plug-in temporary grandstand according to claim 1, characterized in that: The main truss (1) includes a bottom crossbar (14) and a plurality of vertical square tubes (13) fixed on the bottom crossbar (14) with increasing heights in sequence. The vertical insert rod (11) passes through one end of the bottom crossbar (14), and the second sleeve (12) is fixed to the other end of the bottom crossbar (14). A transverse support rod (15) is fixed between two adjacent vertical square tubes (13), and the plurality of transverse support rods (15) are arranged in a stepped manner.

3. The plug-in temporary grandstand according to claim 2, characterized in that: An oblique support rod (16) is installed between two adjacent vertical square tubes (13), and a horizontal support rod (15) and an oblique support rod (16) are installed between the vertical insert rod (11) and the adjacent vertical square tube (13); and / or, a vertical support rod (17) is installed between the horizontal support rod (15) and the bottom crossbar (14).

4. The plug-in temporary grandstand according to claim 1, characterized in that: The secondary truss (2) includes a rectangular frame (22), with angle steel plates fixed on both sides of the upper end of the rectangular frame (22) to form the hanging lugs (21). The hanging lugs (21) are L-shaped and bent downwards. A middle support rod (23) is provided in the middle of the rectangular frame (22), and angle steel rods (24) are symmetrically arranged on both sides of the middle support rod (23). The middle support rod (23) and the angle steel rods (24) are both located inside the rectangular frame (22).

5. The plug-in temporary grandstand according to claim 1, characterized in that: The main truss (1) is stepped, and a fence (4) is fixed on the stepped platform of the main truss (1); the fence (4) includes a rectangular outer frame (41) formed by splicing multiple square tubes, and connecting rods (42) are symmetrically arranged at the bottom of the rectangular outer frame (41). The connecting rods (42) are connected to the main truss (1) by multiple pins; the vertical insert rod (11) and the vertical square tube (13) are provided with connecting seats (18) for connecting to the connecting rods (42).

6. The plug-in temporary grandstand according to claim 5, characterized in that: Multiple round tubes (43) are installed at intervals along a straight line inside the rectangular outer frame (41). The rectangular outer frame (41) is provided with insertion holes (44) for inserting the round tubes (43). Decorative cover plates (45) are installed on both sides of the upper end of the rectangular outer frame (41).

7. The plug-in temporary grandstand according to claim 1, characterized in that: The secondary truss (2) has a first support plate (25) on one side of its upper end and a second support plate (26) on the other side of its lower end. The first support plate (25) and the second support plate (26) are used to support the platform (5). The main truss (1) has a U-shaped fastener (19) fixed on its stepped platform. The U-shaped fastener (19) is used to fasten the platform (5).

8. The plug-in temporary grandstand according to claim 1, characterized in that: A horizontal tie rod (31) and / or a diagonal tie rod (32) are installed between two adjacent vertical columns (3) and between the vertical column (3) and the vertical insert rod (11). A chuck (33) is installed on the vertical column (3) and the vertical insert rod (11). A hinge block (34) is hinged to the end of the horizontal tie rod (31) and the diagonal tie rod (32). The hinge block (34) is installed on the corresponding chuck (33) by a wedge.

9. The plug-in temporary grandstand according to claim 1, characterized in that: The vertical column (3) is a cylindrical steel pipe, and the lower end of the vertical column (3) is equipped with an adjusting foot (6) for adjusting the height; the vertical column (3) is inserted into the first sleeve (112) and fixed by the first pin; the insertion column (111) is inserted into the corresponding second sleeve (12) and fixed by the second pin.

10. The plug-in temporary grandstand according to claim 1, characterized in that: It also includes an end truss (7), one end of which is provided with a boss (71), one end of which is fixed with a seat and the other end of which is equipped with a back rail.

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