Bailey piece with high supporting strength

Abstract

The utility model relates to the technical field of beret pieces, in particular to a beret piece with high supporting strength. The first vertical rod, the second vertical rod and the third vertical rod are vertically arranged between the upper chord member and the lower chord member and are arranged at equal intervals; the two groups of rhombic supporting assemblies are symmetrically arranged between the upper chord member and the lower chord member; the two ends of the first vertical rod are fixedly connected to the end positions of the upper chord and the lower chord respectively, and the two ends of the second vertical rod are fixedly connected to the middle positions of the upper chord and the lower chord respectively; the two ends of the third vertical rod are fixedly connected to the end positions of the upper chord and the lower chord correspondingly and located on the side, away from the first vertical rod, of the second vertical rod. The bailey piece has the advantages that the problem that the bailey piece is prone to fracture due to stress concentration is solved, and the overall supporting strength of the bailey piece is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of a Bailey sheet, in particular to a Bailey sheet with high support strength. BACKGROUND

[0002] The Bailey sheet, also known as a Bailey frame, a Bailey beam or a truss, is suitable for various terrains and climate conditions and can play a unique role in various complex environments. In the military field, the Bailey sheet is the preferred material for quickly building a river-crossing bridge and crossing obstacles in wartime due to its characteristics of quick construction and easy transportation. In the civil construction field, the Bailey sheet can be used in various aspects such as highway bridges, railway bridges, municipal construction and building construction. In natural disasters or emergencies, the Bailey sheet becomes an important tool for building temporary roads and bridges due to its rapid deployment capability. The Bailey sheet is designed in a standardized manner, making the production, transportation, assembly and disassembly process more convenient and efficient.

[0003] In the related art, the Bailey sheet is welded from upper and lower chord bars, vertical bars and diagonal bars, and has a standardized design. The chord bar is composed of two back-to-back square steels, the vertical bar is arranged perpendicularly to the chord bar, and the support points of the diagonal bar are located at the four corner positions of the chord bar and the vertical bar.

[0004] The bearing capacity and structural strength of the Bailey sheet in the above related art are weak, and it cannot adapt to a large support span. CONTENT OF THE INVENTION

[0005] In order to improve the bearing performance of the Bailey sheet and improve the overall support strength of the Bailey sheet, the application provides a Bailey sheet with high support strength.

[0006] The application provides a Bailey sheet with high support strength, which adopts the following technical scheme:

[0007] A Bailey sheet with high support strength comprises an upper chord bar, a lower chord bar, a first vertical bar arranged perpendicularly between the upper chord bar and the lower chord bar and arranged at equal intervals, a second vertical bar, a third vertical bar and two groups of rhombus support assemblies symmetrically arranged between the upper chord bar and the lower chord bar.

[0008] The two ends of the first vertical bar are fixedly connected to the end positions of the upper chord bar and the lower chord bar, the two ends of the second vertical bar are fixedly connected to the middle positions of the upper chord bar and the lower chord bar, and the two ends of the third vertical bar are fixedly connected to the end positions of the upper chord bar and the lower chord bar and are located on the side of the second vertical bar away from the first vertical bar.

[0009] The two rhombus support assemblies are respectively installed between the first vertical bar and the second vertical bar and between the second vertical bar and the third vertical bar.

[0010] By adopting the technical scheme, the two groups of rhombus support assemblies are arranged between the first vertical rod and the second vertical rod and between the second vertical rod and the third vertical rod, which effectively disperses the stress originally concentrated at the four corners of the belay plate, and the rhombus support assembly provides additional support force for the belay plate with its stable geometric structure, thereby significantly improving the overall support strength and reducing the risk of diagonal rod fracture caused by stress concentration. The introduction of the rhombus support assembly not only enhances the support force, but also optimizes the overall structural stability of the belay plate, providing stable support in both horizontal and vertical directions, so that the belay plate can maintain stable structural performance under various complex working conditions. The belay plate of the present application improves stress distribution and enhances support strength, thereby effectively resisting fatigue damage and deformation during long-term use, improving durability and service life.

[0011] Further, the rhombus support assembly includes first and second upper diagonal rods perpendicular to each other and first and second lower diagonal rods perpendicular to each other, the first upper diagonal rod is perpendicular to the first lower diagonal rod, the second upper diagonal rod is perpendicular to the second lower diagonal rod, and the first upper diagonal rod, the second upper diagonal rod, the first lower diagonal rod and the second lower diagonal rod together form a rhombus support structure.

[0012] By adopting the technical scheme, the rhombus has extremely high stability and strength, and this shape is applied to the support assembly of the belay plate. A stable rhombus frame is formed by four mutually perpendicular diagonal rods, which can significantly improve the overall stability of the belay plate, helping to resist external loads and reducing structural deformation caused by vibration or impact. The rhombus support structure can effectively disperse and transfer stress. When the belay plate is subjected to load, the rhombus support assembly can evenly distribute the force to each diagonal rod, thereby avoiding the problem of excessive stress concentration at a specific point or area, reducing the risk of material fatigue and fracture caused by stress concentration, improving the load-bearing performance of the belay plate, and improving the overall support strength of the belay plate, thereby enriching the use scenarios of the belay plate.

[0013] Further, first connecting side plates are respectively arranged on the outer wall of the first vertical rod at the middle position and the outer wall of the third vertical rod at the middle position close to the second vertical rod, and the side wall of the first upper diagonal rod close to the first lower diagonal rod and the side wall of the first lower diagonal rod close to the first upper diagonal rod are fixedly connected with the first connecting side plates.

[0014] The outer wall of the second vertical rod at the middle position is provided with a second connecting side plate for fixedly connecting the second upper diagonal rod and the second lower diagonal rod, and the side wall of the second upper diagonal rod close to the second lower diagonal rod and the side wall of the second lower diagonal rod close to the second upper diagonal rod are fixedly connected with the second connecting side plate.

[0015] By adopting the technical scheme, the middle positions of the first vertical rod and the third vertical rod (close to the side of the second vertical rod) are respectively provided with the first connecting side plate, the first connecting side plate serves as a connecting interface and is used for fixedly connecting the first upper inclined rod and the first lower inclined rod in the rhombus support assembly, the side wall close to one end of the first upper inclined rod and the side wall close to one end of the first lower inclined rod can be fixedly connected with the first connecting side plate, the stable connection between the rhombus support assembly and the vertical rod is ensured, the whole sheet pile structure is more compact and stable. Similarly, the middle position of the second vertical rod is provided with the second connecting side plate. The second connecting side plate serves as a connecting interface and is used for fixedly connecting the second upper inclined rod and the second lower inclined rod in the rhombus support assembly, the side wall close to one end of the second upper inclined rod and the side wall close to one end of the second lower inclined rod are fixedly connected with the second connecting side plate, the connection process is simplified, and the reliability and stability of the connection are improved. The side plate connection mode is adopted to transmit the force of the rhombus support assembly to the vertical rod, thereby improving the bearing capacity and stability of the whole sheet pile, and facilitating positioning and fixing in the manufacturing and installation process, reducing the production cost and installation difficulty.

[0016] Further, the upper chord rod is provided with two upper connecting plates between the first vertical rod and the second vertical rod and between the second vertical rod and the third vertical rod, one end of the first upper inclined rod away from the first connecting side plate is fixedly connected to one side of the upper connecting plate, and one end of the second upper inclined rod away from the second connecting side plate is fixedly connected to the side of the upper connecting plate away from the first upper inclined rod.

[0017] The lower chord rod is provided with two lower connecting plates between the first vertical rod and the second vertical rod and between the second vertical rod and the third vertical rod, one end of the first lower inclined rod away from the first connecting side plate is fixedly connected to one side of the lower connecting plate, and one end of the second lower inclined rod away from the second connecting side plate is fixedly connected to the side of the lower connecting plate away from the first lower inclined rod.

[0018] By adopting the technical scheme, the upper chord rod is provided with two upper connecting plates between the first vertical rod and the second vertical rod and between the second vertical rod and the third vertical rod, the upper connecting plate serves as a connecting bridge and firmly connects the upper inclined rod in the rhombus support assembly and the upper chord rod, and the connection between the rhombus support assembly and the upper chord rod is stable and compact. Similarly to the upper chord rod, the two lower connecting plates of the lower chord rod are located between the first vertical rod and the second vertical rod and between the second vertical rod and the third vertical rod, and serve as connecting bridges and tightly connect the lower inclined rod in the rhombus support assembly and the lower chord rod. The structural connection details of the sheet pile are optimized, the integrity and stability of the structure are enhanced, and the reliability and durability of the connection are improved.

[0019] Further, the first upper inclined rod and the second upper inclined rod are respectively provided with upper end bevels at two end positions close to each other and matched with the upper connecting piece.

[0020] By adopting the above technical scheme, the first upper inclined rod and the second upper inclined rod are respectively provided with upper end bevels at two end positions close to each other and matched with the upper connecting piece, so that the inclined rod and the upper connecting piece can be more closely connected when connected, thereby improving the tightness and stability of the connection. At the same time, the existence of the bevels also helps to disperse the stress at the connection, reducing the risk of material fatigue and fracture caused by stress concentration. Corresponding to the upper end bevels, the first lower inclined rod and the second lower inclined rod are respectively provided with lower end bevels at two end positions close to each other and matched with the lower connecting piece. The lower end bevels also play a role in improving the tightness and stability of the connection and helping to disperse the stress at the connection. The upper end bevels and the lower end bevels make the cooperation between the inclined rod and the connecting piece more accurate and close, simplify the connection process, and improve the reliability and durability of the connection.

[0021] Further, the lower side of the upper chord is provided with an upper connecting side plate close to the position of the upper connecting piece, and the side walls of the first upper inclined rod and the second upper inclined rod are fixedly connected with the upper connecting side plate.

[0022] The upper side of the lower chord is provided with a lower connecting side plate close to the position of the lower connecting piece, and the side walls of the first lower inclined rod and the second lower inclined rod are fixedly connected with the lower connecting side plate.

[0023] By adopting the above technical scheme, the lower side of the upper chord close to the position of the upper connecting piece is additionally provided with an upper connecting side plate. The upper connecting side plate serves as a connection interface and fixedly connects the side walls of the first upper inclined rod and the second upper inclined rod, thereby increasing the connection area, improving the stability of the connection, and also making the connection points more dispersed and helping to reduce the stress concentration phenomenon. Similarly to the upper chord, the upper side of the lower chord close to the position of the lower connecting piece is additionally provided with a lower connecting side plate. The lower connecting side plate also serves as a connection interface and fixedly connects the side walls of the first lower inclined rod and the second lower inclined rod, thereby enhancing the stability of the connection and helping to disperse the stress at the connection. The upper connecting side plate and the lower connecting side plate fixedly connect the side walls of the inclined rods, further optimizing the structural connection mode of the belay piece, improving the strength and stability of the connection, and making the entire structure more compact and integrated.

[0024] Further, the upper chord and the lower chord are provided with a connecting head assembly for connecting with adjacent berets, the connecting head assembly comprises two connecting female heads and two connecting male heads, two connecting female heads are respectively arranged at the end of the upper chord and the lower chord close to the first vertical rod, and two connecting male heads are respectively arranged at the end of the upper chord and the lower chord close to the third vertical rod.

[0025] By adopting the above technical scheme, the connecting head assembly is composed of two connecting female heads and two connecting male heads, four connecting heads are arranged on the upper chord and the lower chord of the beret respectively, and are used for connecting with the corresponding parts of the adjacent beret. Two connecting female heads are arranged at the end of the upper chord and the lower chord close to the first vertical rod, when a plurality of berets are arranged side by side, two connecting female heads are arranged on one side of each beret for matching with the connecting male heads of the adjacent beret. The connecting mode of female and male heads can ensure that the connection between adjacent berets is stable and reliable, and prevent loosening or falling off due to vibration or external force during use.

[0026] Further, the lower side of the lower chord is provided with at least one water drain hole.

[0027] By adopting the above technical scheme, the beret may accumulate some water during use in a humid or rainy environment. The water drain hole arranged on the lower side of the lower chord can effectively drain the accumulated water, keep the beret dry, and thus improve the drainage performance. The accumulation of water is one of the main reasons for the corrosion of metal structures. By draining the accumulated water in time, the contact time of the beret with the humid environment can be reduced, the risk of corrosion can be reduced, and the service life of the beret can be prolonged, and the structural strength can be maintained. The accumulation of water may also cause stress concentration phenomenon in the beret, thereby affecting the structural stability. The water drain hole can reduce the stress concentration caused by the accumulation of water, and enhance the overall structural stability of the beret.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. By introducing the diamond-shaped support assembly into the beret and arranging it between the first vertical rod and the second vertical rod and between the second vertical rod and the third vertical rod, the stress originally concentrated at the four corners of the beret is effectively dispersed. The diamond-shaped support assembly provides additional support force for the beret with its stable geometric structure, significantly improves the overall support strength, and reduces the risk of diagonal rod fracture caused by stress concentration. This layout not only enhances the support force, but also optimizes the overall structural stability of the beret, providing stable support in both horizontal and vertical directions, so that the beret can maintain stable structural performance under various complex working conditions;

[0030] 2. By adding upper and lower connecting side plates as connection interfaces, the connections between the diagonal and vertical members, and between the upper and lower chords of the rhomboid support assembly are optimized. This increases the connection area, improves the stability of the connection, and makes the connection points more dispersed, helping to reduce stress concentration. Simultaneously, the upper and lower bevels between the connecting plates and the diagonal members make the connection more precise and tighter, improving the tightness and stability of the connection.

[0031] 3. The male and female connectors of the connector assembly ensure a secure connection between adjacent Bailey panels, preventing loosening or detachment;

[0032] 4. The addition of drainage holes on the underside of the lower chord is another significant improvement in this application. This design effectively enhances the drainage performance of the Bailey panels, enabling timely removal of accumulated moisture and maintaining their dryness. Moisture accumulation is a major cause of corrosion in metal structures; timely drainage reduces the contact time between the Bailey panels and the humid environment, thereby lowering the risk of corrosion. Attached Figure Description

[0033] Figure 1 This is a frontal schematic diagram of a high-strength Bailey sheet according to an embodiment of this application.

[0034] Figure 2 This is a schematic diagram of the structure of the rhomboid support component in the embodiments of this application.

[0035] Figure 3 yes Figure 1 Enlarged structural diagram of the first upper inclined rod, the second upper inclined rod, the upper connecting piece, and the upper connecting side plate in section A.

[0036] Figure 4 This is a bottom view of the lower chord in an embodiment of this application.

[0037] Figure 5 yes Figure 4 Enlarged schematic diagram of the structure connecting the male end and the drain hole in section B.

[0038] Figure 6 yes Figure 4 Enlarged schematic diagram of the structure connecting the male head and the drain hole in section C.

[0039] Explanation of reference signs: 1, upper chord; 11, upper connecting plate; 12, upper connecting side plate; 2, lower chord; 21, lower connecting plate; 22, lower connecting side plate; 23, drain hole; 3, first vertical rod; 31, first connecting side plate; 4, second vertical rod; 41, second connecting side plate; 5, third vertical rod; 6, rhombic support assembly; 61, first upper inclined rod; 611, upper end inclined angle; 62, second upper inclined rod; 63, first lower inclined rod; 631, lower end inclined angle; 64, second lower inclined rod; 7, connecting head assembly; 71, connecting female head; 72, connecting male head. DETAILED DESCRIPTION

[0040] In order to make the purposes, technical solutions and advantages of the present application clearer, the following will further explain the present application in detail with reference to the accompanying drawings and embodiments. Figures 1-6 and embodiments, the present application will be further explained in detail.

[0041] The embodiments of the present application disclose a high-support-strength Bailey piece. Referring to the accompanying drawings and embodiments, the high-support-strength Bailey piece comprises an upper chord 1, a lower chord 2, a first vertical rod 3, a second vertical rod 4, a third vertical rod 5, two groups of rhombic support assemblies 6 and a connecting head assembly 7 for connecting with adjacent Bailey pieces. Figure 1 and Figure 2 The high-support-strength Bailey piece comprises an upper chord 1, a lower chord 2, a first vertical rod 3, a second vertical rod 4, a third vertical rod 5, two groups of rhombic support assemblies 6 and a connecting head assembly 7 for connecting with adjacent Bailey pieces.

[0042] The first vertical rod 3, the second vertical rod 4 and the third vertical rod 5 are vertically arranged between the upper chord 1 and the lower chord 2 and are arranged at equal intervals, the two groups of rhombic support assemblies 6 are both mounted between the upper chord 1 and the lower chord 2, one group of rhombic support assemblies 6 is mounted between the first vertical rod 3 and the second vertical rod 4, the other group of rhombic support assemblies 6 is mounted between the second vertical rod 4 and the third vertical rod 5, and the two groups of rhombic support assemblies 6 are arranged in axial symmetry about the second vertical rod 4.

[0043] The two ends of the first vertical rod 3 are fixedly connected to the end positions of the upper chord 1 and the lower chord 2 respectively, the two ends of the second vertical rod 4 are fixedly connected to the middle positions of the upper chord 1 and the lower chord 2 respectively, and the two ends of the third vertical rod 5 are fixedly connected to the end positions of the upper chord 1 and the lower chord 2 respectively and are located on the side of the second vertical rod 4 away from the first vertical rod 3. The upper chord 1 and the lower chord 2 in the embodiment both comprise two square steels arranged back to back, each vertical rod is clamped between the two square steels and is fixedly connected with the two square steels.

[0044] The middle position of the first vertical rod 3 and the middle position of the third vertical rod 5 are fixedly connected with the first connecting side plate 31 on the outer wall respectively, and the two first connecting side plates 31 are both close to the side of the second vertical rod 4. The second connecting side plate 41 is fixedly connected on the outer wall at the middle position of the second vertical rod 4. The first connecting side plate 31 and the second connecting side plate 41 can both provide the interface for the fixed connection of the rhombic support assembly 6.

[0045] The rhombic support assembly 6 comprises a first upper diagonal rod 61, a second upper diagonal rod 62, a first lower diagonal rod 63 and a second lower diagonal rod 64. The first upper diagonal rod 61 and the second upper diagonal rod 62 are perpendicular to each other. The first lower diagonal rod 63 and the second lower diagonal rod 64 are perpendicular to each other. The first upper diagonal rod 61 and the first lower diagonal rod 63 are perpendicular to each other. The second upper diagonal rod 62 and the second lower diagonal rod 64 are perpendicular to each other. The four diagonal rods together form a stable rhombic support structure.

[0046] The side wall of the first upper diagonal rod 61 near the end of the first lower diagonal rod 63 and the side wall of the first lower diagonal rod 63 near the end of the first upper diagonal rod 61 are fixedly connected with the first connecting side plate 31. The side wall of the second upper diagonal rod 62 near the end of the second lower diagonal rod 64 and the side wall of the second lower diagonal rod 64 near the end of the second upper diagonal rod 62 are fixedly connected with the second connecting side plate 41.

[0047] Referring to Figure 1 and Figure 3 The upper chord 1 is provided with two upper connecting pieces 11. One of the upper connecting pieces 11 is located between the first vertical rod 3 and the second vertical rod 4, and the other upper connecting piece 11 is located between the second vertical rod 4 and the third vertical rod 5. The end of the first upper diagonal rod 61 away from the first connecting side plate 31 is fixedly connected to one side of the upper connecting piece 11. The end of the second upper diagonal rod 62 away from the second connecting side plate 41 is fixedly connected to the side of the upper connecting piece 11 away from the first upper diagonal rod 61. The two ends of the first upper diagonal rod 61 and the second upper diagonal rod 62 close to each other are respectively provided with upper end bevels 611 matched with the upper connecting piece 11.

[0048] The lower chord 2 is provided with two lower connecting pieces 21 located above and below the upper connecting pieces 11. The end of the first lower diagonal rod 63 away from the first connecting side plate 31 is fixedly connected to one side of the lower connecting piece 21. The end of the second lower diagonal rod 64 away from the second connecting side plate 41 is fixedly connected to the side of the lower connecting piece 21 away from the first lower diagonal rod 63. The two ends of the first lower diagonal rod 63 and the second lower diagonal rod 64 close to each other are respectively provided with lower end bevels 631 matched with the lower connecting piece 21.

[0049] The lower side of the upper chord 1 near the upper connecting piece 11 is provided with an upper connecting side plate 12. The side walls of the first upper diagonal rod 61 and the second upper diagonal rod 62 are fixedly connected with the upper connecting side plate 12. The upper side of the lower chord 2 near the lower connecting piece 21 is provided with a lower connecting side plate 22. The side walls of the first lower diagonal rod 63 and the second lower diagonal rod 64 are fixedly connected with the lower connecting side plate 22.

[0050] Referring to Figure 1 and Figure 4The connector assembly 7 includes two female connectors 71 and two male connectors 72. The two female connectors 71 are located on the same side of the belay, and the two male connectors 72 are located on the side of the belay away from the female connectors 71. When multiple belays are arranged side by side, each belay has two female connectors 71 on one side to match the male connectors 72 of the adjacent belay, ensuring stable and reliable connection between adjacent belays. In this embodiment, the two female connectors 71 are fixedly connected to the end of the upper chord 1 near the first vertical rod 3 and the end of the lower chord 2 near the first vertical rod 3, respectively, and the two male connectors 72 are fixedly connected to the ends of the upper chord 1 and the lower chord 2 near the third vertical rod 5, respectively.

[0051] In the use of the belay in a humid or rainy environment, some water may accumulate. Referring to Figure 5 and Figure 6 In this embodiment, two drainage holes 23 are provided on the lower side of the lower chord 2, one of which is provided at the connection position of the lower chord 2 and the first vertical rod 3, and the other is provided at the connection position of the lower chord 2 and the third vertical rod 5. The drainage holes 23 can effectively drain the accumulated water, keeping the belay dry.

[0052] The implementation principle of the belay with high support strength in this embodiment is as follows: the belay adopts an upper chord 1, a lower chord 2, first vertical rods 3, second vertical rods 4, third vertical rods 5, and two groups of diamond-shaped support assemblies 6 to form a main structure. By increasing the diamond-shaped support assemblies 6, the stress that may be concentrated at the corners of the belay or the connection positions of the vertical rods is effectively dispersed, and the overall support strength is improved. The diamond-shaped support assembly 6 is composed of four mutually perpendicular diagonal rods, forming a stable diamond-shaped structure to provide support for the belay and enhance the stability and load-bearing capacity of the structure.

[0053] First and second connecting side plates 31 and 41 are provided at the middle positions of the first and third vertical rods 3 and 5 as the connecting interface between the diamond-shaped support assembly 6 and the vertical rods, increasing the connecting area and improving the stability of the connection, which helps to disperse the stress at the connection position. Upper and lower connecting plates 11 and 21 are provided on the upper and lower chords 1 and 2, respectively, for connecting the diagonal rods of the diamond-shaped support assembly 6. Upper and lower end bevels 611 and 631 are provided between the diagonal rods and the connecting plates to make the connection more compact and accurate, improving the strength and stability of the connection. Drainage holes 23 are provided on the lower side of the lower chord 2 to drain accumulated water, keep the belay dry, reduce the contact time of the belay with the humid environment, and prolong the service life of the belay.

[0054] The connecting head assembly 7 enables multiple bearers to be arranged side by side and stably connected through the connecting mode of the male head and the female head.

[0055] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A high support strength timber beam, characterised in that: The utility model provides a kind of frame structure, including upper chord (1), lower chord (2), first vertical pole (3) being vertically arranged between the upper chord (1) and the lower chord (2) and equidistantly spaced arrangement, second vertical pole (4), third vertical pole (5) and two groups of diamond support components (6) being symmetrically arranged between the upper chord (1) and the lower chord (2); Two ends of the first vertical pole (3) are fixedly connected to the end position of the upper chord (1) and the lower chord (2) respectively, two ends of the second vertical pole (4) are fixedly connected to the intermediate position of the upper chord (1) and the lower chord (2) respectively, and two ends of the third vertical pole (5) are fixedly connected to the end position of the upper chord (1) and the lower chord (2) respectively and are located on the side of the second vertical pole (4) away from the first vertical pole (3); Two diamond support components (6) are installed between the first vertical pole (3) and the second vertical pole (4) and between the second vertical pole (4) and the third vertical pole (5) respectively; The diamond support component (6) includes first upper inclined pole (61), second upper inclined pole (62) perpendicular to each other and first lower inclined pole (63), second lower inclined pole (64) perpendicular to each other, the first upper inclined pole (61) and the first lower inclined pole (63) are perpendicular to each other, the second upper inclined pole (62) and the second lower inclined pole (64) are perpendicular to each other, and the first upper inclined pole (61), the second upper inclined pole (62), the first lower inclined pole (63) and the second lower inclined pole (64) jointly form a diamond support structure; The first connecting side plate (31) is fixedly connected to the side wall of the first upper inclined pole (61) close to one end of the first lower inclined pole (63) and the side wall of the first lower inclined pole (63) close to one end of the first upper inclined pole (61) respectively on the outer wall close to the side of the second vertical pole (4) at the intermediate position of the first vertical pole (3) and the intermediate position of the third vertical pole (5); The second connecting side plate (41) for fixedly connecting the second upper inclined pole (62) and the second lower inclined pole (64) is arranged on the outer wall at the intermediate position of the second vertical pole (4), and the side wall of the second upper inclined pole (62) close to one end of the second lower inclined pole (64) and the side wall of the second lower inclined pole (64) close to one end of the second upper inclined pole (62) are fixedly connected to the second connecting side plate (41); The upper chord (1) is provided with two upper connecting pieces (11) between the first vertical pole (3) and the second vertical pole (4) and between the second vertical pole (4) and the third vertical pole (5) respectively, one end of the first upper inclined pole (61) away from the first connecting side plate (31) is fixedly connected to one side of the upper connecting piece (11), and one end of the second upper inclined pole (62) away from the second connecting side plate (41) is fixedly connected to the side of the upper connecting piece (11) away from the first upper inclined pole (61). The lower chord (2) is respectively provided with two lower connecting plates (21) between the first vertical rod (3) and the second vertical rod (4) and between the second vertical rod (4) and the third vertical rod (5), one end of the first lower inclined rod (63) away from the first connecting side plate (31) is fixedly connected to one side of the lower connecting plate (21), and one end of the second lower inclined rod (64) away from the second connecting side plate (41) is fixedly connected to the side of the lower connecting plate (21) away from the first lower inclined rod (63); The first upper inclined rod (61) and the second upper inclined rod (62) are respectively provided with upper end bevels (611) matched with the upper connecting plate (11) at the positions of the two ends close to each other, and the first lower inclined rod (63) and the second lower inclined rod (64) are respectively provided with lower end bevels (631) matched with the lower connecting plate (21) at the positions of the two ends close to each other; The lower side of the upper chord (1) is provided with an upper connecting side plate (12) at the position close to the upper connecting plate (11), and the side walls of the first upper inclined rod (61) and the second upper inclined rod (62) are fixedly connected with the upper connecting side plate (12); The upper side of the lower chord (2) is provided with a lower connecting side plate (22) at the position close to the lower connecting plate (21), and the side walls of the first lower inclined rod (63) and the second lower inclined rod (64) are fixedly connected with the lower connecting side plate (22); The upper chord (1) and the lower chord (2) are provided with a connecting head assembly (7) for connecting with adjacent bearers, the connecting head assembly (7) includes two connecting female heads (71) and two connecting male heads (72), the two connecting female heads (71) are respectively arranged at the ends of the upper chord (1) and the lower chord (2) close to the first vertical rod (3), and the two connecting male heads (72) are respectively arranged at the ends of the upper chord (1) and the lower chord (2) close to the third vertical rod (5); The lower side of the lower chord (2) is provided with at least one drain hole (23).

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