Spatial structure lower supporting type bracket reinforcing structure and construction method thereof

Abstract

The invention provides a space structure lower supporting type bracket reinforcing structure and a construction method thereof. The space structure lower supporting type bracket reinforcing structure comprises a structure column. The bracket assembly is arranged between the two structural columns and used for lifting a steel structure to enable load force to be transmitted, and supporting assemblies used for supporting the steel structure are symmetrically arranged at one ends of the two structural columns; the steel structure comprises a connecting rod and a plurality of lower chord balls arranged on the connecting rod, the supporting assembly comprises a plurality of semicircular grooves connected with the lower chord balls, the lower chord balls and the semicircular grooves are connected in a matched mode, and the steel structure is supported and fixed. The stability of the whole system bracket structure is enhanced, deformation caused by external loads is effectively resisted, the integrity and functionality of the structure are kept, meanwhile, the load of a space structure can be effectively transmitted to the ground or a next-layer structure plate face, and the safety and reliability of the structure are remarkably improved.

Description

Technical Field

[0001] The invention relates to a space structure under-supporting bracket reinforcement structure and a construction method thereof. Background Art

[0002] The application of steel structure buildings began to sprout at the end of the 18th century. With the in-depth development of the industrial revolution, steel structures were already used in public buildings and industrial buildings at the end of the 19th century. Since the 21st century, steel structure buildings have ushered in new development opportunities and have been widely used in many fields such as high-rise buildings, large-span bridges, and stadiums. With the excellent performance of steel materials, the high degree of industrialization of production and installation, and the ability to achieve special shapes that traditional buildings cannot achieve, and compared with traditional brick-concrete structures and reinforced concrete structures, it has the characteristics of "light weight, good earthquake resistance, good durability, large span, energy saving and environmental protection, and good economy", and its application scope has gradually increased. However, in recent years, some large-span space structures in various regions have decreased their bearing capacity, increased deformation, and reduced safety due to fatigue performance or corrosion of steel after reaching a certain service life, and lack of mature processing technology; at the same time, the use function of large-span space structures has changed, such as adding photovoltaic panels to the roof or adding equipment and other loads during later renovations, and the original structure cannot meet the requirements and urgently needs scientific and reasonable reinforcement measures. Summary of the invention

[0003] The present invention provides a spatial structure under-supporting bracket reinforcement structure and a construction method thereof, which can effectively solve the above-mentioned problems.

[0004] The present invention is achieved in that:

[0005] A space structure under-support bracket reinforcement structure, comprising:

[0006] A structural column; a bracket assembly arranged between the two structural columns and used to lift the steel structure to transfer the load force, and a support assembly for supporting the steel structure is symmetrically arranged at one end of the two structural columns;

[0007] The steel structure includes a connecting rod and a plurality of lower chord balls arranged on the connecting rod. The supporting assembly includes a semicircular groove connected to the plurality of lower chord balls, so that the lower chord balls and the semicircular groove are adapted to be connected and support and fix the steel structure.

[0008] As a further improvement, a plurality of the lower chord balls are arranged on the connecting rod at equal intervals, and a plug-in hole is formed in the middle of the lower chord ball.

[0009] As a further improvement, the bracket assembly includes an additional steel beam, an upper chord and a lower chord arranged between two of the additional steel beams, a plurality of longitudinal straight web members arranged between the upper chord and the lower chord, and a longitudinal diagonal web member arranged between the plurality of longitudinal straight web members.

[0010] As a further improvement, the two bracket assemblies also include a reinforcement structure, which includes a transverse horizontal upper web and a transverse horizontal lower web, first bolts respectively arranged at both ends of the transverse horizontal upper web and the transverse horizontal lower web, and a plurality of stiffening plates respectively arranged on the outer walls of the upper chord and the lower chord, and transverse reinforcing diagonal webs are cross-arranged between the plurality of stiffening plates.

[0011] As a further improvement, the support assembly includes a steel pipe A and a steel pipe B, a fastening sleeve arranged between the steel pipe A and the steel pipe B, a steel plate base arranged at one end of the steel pipe B, stiffening ribs arranged on the steel plate base, and socket bolts arranged in the middle of the stiffening ribs, and a semicircular groove is formed at the top end of the stiffening ribs for connecting with the lower chord ball.

[0012] As a further improvement, a rubber pad is provided on the semicircular groove for increasing the force balance between the lower chord ball and the semicircular groove.

[0013] As a further improvement, the inner wall of the fastening sleeve is provided with a circle of expansion strips.

[0014] As a further improvement, a balance tie rod is provided between the plurality of the bracket assemblies, and the balance tie rod is connected to the upper chord rod and the lower chord rod through the first bolt to connect the plurality of the bracket assemblies.

[0015] As a further improvement, pressure plates are provided on both sides of the structural column, a screw rod passes through the structural column and the pressure plates, and second bolts are provided at both ends of the screw rod.

[0016] The present invention further provides a method for reinforcing a space structure under-support bracket, the method comprising the following steps:

[0017] S1. Conduct on-site inspection to ensure that all construction conditions meet the requirements, including leveling the ground and clearing obstacles;

[0018] S2. The bracket is manufactured in a factory or on site, and the upper chord and the lower chord are connected by the transverse horizontal upper web member and the transverse horizontal lower web member through the first bolt, and the upper chord and the lower chord are welded and connected with the longitudinal straight web member. Then, in the cross section, the transverse reinforcement diagonal web member and the longitudinal straight web member are connected and reinforced by the stiffening plate, and the longitudinal diagonal web member and the longitudinal straight web member are welded and reinforced in the longitudinal direction. At the same time, the two upper chords are obliquely welded with the lower chord and fixed on the stiffening plate, so as to form an inverted quadrangular pyramid or inverted triangular pyramid connection node;

[0019] S3. Transport the prepared bracket to the construction site and install it in place according to the design drawings;

[0020] S4. Weld steel pipe A to the upper chord of the bracket and ensure the welding quality. At the same time, install the fastening sleeve on steel pipe A and fasten it to steel pipe B. Then, weld the steel plate base and stiffening ribs on steel pipe B to ensure the stability of the structure, and the socket bolts are plugged into the socket holes on the lower chord ball to form a permanent support node;

[0021] S5. The newly added steel beam is fixed to the stiffening plate of the bracket by bolts to form a stable connection, and then the newly added steel beam is fixed to the pressure plate on the structural column by the screw rod and the first bolt to complete the load transfer path;

[0022] S6. Install a balancing tie rod between the brackets, connecting the upper chord and the lower chord by a first bolt;

[0023] S7. The load of the spatial structure is gradually transferred to the bracket structure through permanent supporting nodes to ensure the stability of the bracket structure of the entire system.

[0024] The beneficial effects of the present invention are:

[0025] (1) The present invention can effectively transfer the load of the spatial structure to the ground or the next layer of the structural board by using permanent support nodes formed by steel pipes, fastening sleeves, etc., which significantly improves the safety and reliability of the structure. This design is particularly suitable for old spatial structures or large-span spatial structures, and the problem of insufficient bearing capacity caused by increased service life or changes in function is effectively solved.

[0026] (2) The present invention adds a connection design between the steel beam and the structural column, so that the load on the bracket can be effectively transferred to the ground, thereby enhancing the bearing capacity of the structure and meeting the additional load requirements brought about by changes in the structural use function, such as adding photovoltaic panels to the roof or adding equipment during later renovation.

[0027] (3) The present invention connects multiple brackets into a whole through a balance tie rod, thereby enhancing the stability of the entire system bracket structure, effectively resisting deformation caused by external loads, and maintaining the integrity and functionality of the structure.

[0028] (4) The present invention prolongs the service life of the spatial structure and reduces the cost of structural maintenance and replacement due to decreased bearing capacity by reinforcing and optimizing the load transfer path of the structure.

[0029] (5) The structural design of the present invention simplifies the construction and maintenance process, reduces the construction difficulty and maintenance cost, and makes the upgrading and transformation of the structure more efficient and economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is the front view of the present invention.

[0032] Figure 2 Schematic diagram of the bracket assembly of the present invention.

[0033] Figure 3 It is a cross-sectional view of the bracket assembly of the present invention.

[0034] Figure 4 It is a connection schematic diagram of the bracket assembly and the balance tie rod of the present invention.

[0035] Figure 5 It is a schematic diagram of the bolt connection of the bracket assembly and the newly added steel beam of the present invention.

[0036] Figure 6 It is a schematic diagram of the welding connection of the bracket assembly and the newly added steel beam of the present invention.

[0037] Figure 7 It is a schematic diagram of the connection between the bracket assembly and the structural column of the present invention.

[0038] Figure 8 It is a schematic diagram of the connection of the newly added steel beams and structural columns of the present invention.

[0039] Fig. 9 It is a schematic diagram of the non-eccentric structure of the support assembly of the present invention.

[0040] Fig.10 It is a schematic diagram of the eccentric structure of the support assembly of the present invention.

[0041] Description of Figure Numbers:

[0042] 1. Structural columns;

[0043] 2. Bracket assembly; 20. Newly added steel beam; 21. Upper chord; 22. Lower chord; 23. Longitudinal diagonal web member; 24. Longitudinal straight web member; 25. Transverse upper web member; 26. Transverse lower web member; 27. Transverse reinforcement diagonal web member; 28. First bolt; 29. ​​Stiffener plate;

[0044] 3. Connecting rod; 4. Lower string ball;

[0045] 5. Support assembly; 51. Steel pipe A; 52. Fastening sleeve; 53. Steel pipe B; 54. Steel plate base; 55. Stiffening ribs; 56. Socket bolts; 57. Semicircular grooves; 58. Rubber pads; 59. Expansion strips; 6. Balance tie rods; 8. Pressure plates; 9. Screws; 10. Second bolts. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0047] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] Reference Figure 1-10 As shown, a space structure under-support bracket reinforcement structure includes

[0049] Structural column 1; a bracket assembly 2 arranged between the two structural columns 1 and used to lift the steel structure 1-0 to transfer the load force, and a support assembly 5 for supporting the steel structure 1-0 is symmetrically arranged at one end of the two structural columns 1;

[0050] The steel structure 1-0 includes a connecting rod 3, a plurality of lower chord balls 4 arranged on the connecting rod 3, and the supporting assembly 5 includes a semicircular groove 57 connected to the plurality of lower chord balls 4, so that the lower chord balls 3 and the semicircular groove 57 are adapted to be connected and support and fix the steel structure 1-0.

[0051] A plurality of lower chord balls 4 are arranged on the connecting rod 3 at equal intervals, and a plug-in hole is formed in the middle of the lower chord ball 3. The plug-in hole is in the shape of a circle, a square, a triangle or a semicircle.

[0052] The bracket assembly 2 includes a newly added steel beam 20, an upper chord 21 and a lower chord 22 arranged between the two newly added steel beams 20, a plurality of longitudinal straight web members 24 arranged between the upper chord 21 and the lower chord 22, and a longitudinal diagonal web member 23 arranged between the plurality of longitudinal straight web members 24.

[0053] The two bracket assemblies 2 also include a reinforcement structure, which includes a transverse horizontal upper web 25 and a transverse horizontal lower web 26, first bolts 28 respectively arranged at both ends of the transverse horizontal upper web 25 and the transverse horizontal lower web 26, and a plurality of stiffening plates 29 respectively arranged on the outer walls of the upper chord 21 and the lower chord 22, and transverse reinforcing diagonal webs 27 are cross-arranged between the plurality of stiffening plates 29.

[0054] The first bolt 28 is a high-strength bolt or an ordinary bolt. In order to ensure the connection strength and safety of the entire structure. Preferably, the first bolt 28 is a high-strength bolt. The high-strength bolt is made of high-strength materials, such as 45 steel, 40 boron steel, 20 manganese titanium boron steel, etc., and has higher tensile strength and shear strength, so that the high-strength bolt can withstand greater loads and external forces, ensuring the stability and safety of the structure.

[0055] Furthermore, the following experimental data were obtained in this case:

[0056] Bolt Type High Strength Bolts Ordinary bolts Bolt grade 10.9 4.6 Bolt specifications M20 M20 Welding process E5015 welding rod E4315 welding rod cost Medium to high Low stability 95％ 75％ Security 97％ 70％

[0057] It can be seen from the experimental data that when high-strength bolts are used, the stability and safety of the structure will be higher.

[0058] The support assembly 5 includes a steel pipe A51 and a steel pipe B53, a fastening sleeve 52 arranged between the steel pipe A51 and the steel pipe B53, a steel plate base 54 arranged at one end of the steel pipe B53, a stiffening rib 55 arranged on the steel plate base 54, and a socket bolt 56 arranged in the middle of the stiffening rib 55. The top end of the stiffening rib 55 is formed with a semicircular groove 57 for connecting with the lower chord ball 4.

[0059] Furthermore, in order to ensure the stability between the fastening sleeve 52 and the steel pipe A51 and the steel pipe B53, the outer diameter end face of the fastening sleeve 52 is provided with a chamfer (not shown in the figure), and the chamfer has an angle C, wherein 20 degrees ≤ C ≤ 45 degrees. In order to ensure that the fastening sleeve 52 can effectively connect the steel pipe A51 and the steel pipe B53, preferably, C is about 45 degrees.

[0060] Furthermore, the chamfer has a dimension D, 1 mm ≤ D ≤ 2 mm. This is to reduce scratches when parts come into contact with each other and avoid unexpected problems caused by burrs falling off, but also to increase costs. Preferably, D is about 1.5 mm.

[0061] Among them, the chamfer setting can serve as a guide to facilitate the smooth assembly of parts, especially in the fit between the hole and the shaft, the chamfer can facilitate the insertion of the shaft, and the 1.5mm chamfer size can provide a good assembly guide without causing too much impact on the assembly space. At the same time, the chamfer can reduce stress concentration and enhance the strength of shaft parts, and the appropriate chamfer size helps to disperse stress and improve the durability of parts. Furthermore, the 1.5mm chamfer size can avoid excessive processing while ensuring safety and performance, keeping the processing cost and time within a reasonable range.

[0062] The semicircular groove 57 is provided with a rubber pad 58 for increasing the force balance between the lower chord ball 4 and the semicircular groove 57. The inner wall of the fastening sleeve 52 is provided with a circle of expansion strips 59.

[0063] A balance tie rod 6 is provided between the plurality of bracket assemblies 2 , and the balance tie rod 6 is connected to the upper chord 21 and the lower chord 22 via the first bolt 28 to connect the plurality of bracket assemblies 2 .

[0064] Pressure plates 8 are disposed on both sides of the structural column 1 , a screw rod 9 passes through the structural column 1 and the pressure plates 8 , and second bolts 10 are disposed at both ends of the screw rod 9 .

[0065] How this case works:

[0066] The lower chord ball 4 is the starting point of load transfer. The load is transferred to the semicircular groove 57 connected to it through the lower chord ball 4. The semicircular groove 57 is designed to cooperate with the lower chord ball 4 and is connected to the socket hole on the lower chord ball 4 through the socket bolt 56 to ensure the effective transfer of the load. The rubber pad 58 is arranged between the semicircular groove 57 and the lower chord ball 4 to balance the force, reduce local stress concentration, and provide buffering and shock absorption effects. The load is transferred from the semicircular groove 57 to the stiffening rib 55, which is welded on the The steel plate base 54 enhances the stability and bearing capacity of the structure. The steel plate base 54 is welded to the steel pipe B53 to further stabilize the entire structure. The steel pipe A51 is welded to the upper chord 21 and is fastened to the steel pipe B53 through the fastening sleeve 52. This connection method ensures that the load can be transferred from the steel pipe A51 to the steel pipe B53. The upper chord 21 and the lower chord 22 are connected by the transverse horizontal upper web member 25 and the transverse horizontal lower web member 26 with the first bolt 28, and by the longitudinal The straight web members 24 are connected by welding to form a stable triangular structure, which enhances the stability and bearing capacity of the bracket. The transversely reinforced diagonal web members 27 and the longitudinal diagonal web members 23 further reinforce the bracket structure, and the newly added steel beam 20 is fixed to the stiffening plates 29 at both ends of the bracket by bolts to form an inverted quadrangular pyramid or inverted triangular pyramid connection node, which transfers the load from the bracket to the newly added steel beam 20. The newly added steel beam 20 is fixed to the pressure plate 8 on the structural column 1 by the screw 9 and the first bolt 28, which transfers the load from the newly added steel beam 20 to the structural column 1, and finally to the ground or the next structural plate surface. The working principle of the whole system is to gradually transfer the load of the spatial structure to the ground or the next structural plate surface through these carefully designed connection and reinforcement methods, while ensuring the stability and safety of the structure. The working principle of the whole system is to gradually transfer the load of the spatial structure to the ground or the next structural plate surface through these carefully designed connection and reinforcement methods, while ensuring the stability and safety of the structure.

[0067] Among them, the design of the inverted tetrahedron and inverted triangular pyramid connection nodes can provide good structural stability and bearing capacity. This connection method makes the grid structure have higher rigidity in space and can effectively bear and transfer loads. Especially in large-span buildings, this structural form can give full play to the advantages of three-dimensional space, and the force transmission path is simpler. In addition, the design of this connection node also helps to simplify the construction process because they can be manufactured in the factory as prefabricated units and then assembled on site, which effectively simplifies the work steps and improves the construction progress.

[0068] To further illustrate the structure set up in this case, the following is made:

[0069] The upper chord 21 and the lower chord 22 are connected by the transverse horizontal upper web member 25 and the transverse horizontal lower web member 26 and the first bolt 28. This connection method can withstand shear force and bending moment, but it mainly depends on the shear resistance of the bolts. The longitudinal straight web member 24 is connected to the upper chord 21 and the lower chord 22 by welding. The welded connection provides higher rigidity and strength and can effectively transmit axial force and bending moment; the transverse reinforcement diagonal web member 27 is connected and reinforced with the stiffening plate 29 on the longitudinal straight web member 24 by the first bolt 28. This connection method can improve the lateral stability and torsion resistance of the structure; the longitudinal diagonal web member 23 is welded and reinforced with the longitudinal straight web member 24, which enhances the longitudinal stability and bending resistance of the bracket, and the support assembly 5 provides a permanent support node for the entire structure, as follows: the steel pipe A51 is fastened to the steel pipe B53 by the fastening sleeve 52. This connection method can withstand larger axial forces. The effect of the fastening sleeve 52 Similar to a rigid connection, it can effectively transfer loads. The steel plate base 54 and the stiffening ribs 55 provide additional local stiffness and support the semicircular groove 57. This design can disperse the load and reduce local stress concentration. The semicircular groove 57 and the socket bolt 56 tighten the lower chord ball 4 of the spatial structure. This connection method can provide stable supporting force. At the same time, the rubber pad 58 plays a role in force balance, reducing local stress concentration and protecting the structure from wear. Furthermore, for the sealing of the permanent support node to prevent moisture intrusion and cause structural performance degradation, the expansion strip 59 set can effectively prevent this problem from occurring. The expansion strip 59 is a rubber product that can expand by itself after contacting moisture. Its expansion effect can block gaps. After contacting moisture, they can quickly absorb moisture and expand in volume to form an effective waterproof barrier. This expansion deformation can reach 2-3 times the original volume, thereby achieving a water-stopping and waterproofing effect.

[0070] The present invention further provides a method for reinforcing a space structure under-support bracket, the method comprising the following steps:

[0071] S1. Conduct on-site inspection to ensure that all construction conditions meet the requirements, including leveling the ground and clearing obstacles;

[0072] S2. The bracket is manufactured in a factory or on site, and the upper chord 21 and the lower chord 22 are connected by the transverse horizontal upper web member 25 and the transverse horizontal lower web member 26 through the first bolt 28, and the upper chord 21 and the lower chord 22 are welded and connected with the longitudinal straight web member 24. Then, in the cross section, the transverse reinforcement diagonal web member 27 and the longitudinal straight web member 24 are connected and reinforced by the stiffening plate 29, and the longitudinal diagonal web member 23 and the longitudinal straight web member 24 are welded and reinforced in the longitudinal direction. At the same time, the two upper chords 21 are obliquely welded with the lower chord 22 and fixed on the stiffening plate 29, so as to form an inverted quadrangular pyramid or inverted triangular pyramid connection node;

[0073] S3. Transport the prepared bracket to the construction site and install it in place according to the design drawings;

[0074] S4. Weld the steel pipe A51 to the bracket upper chord 21 and ensure the welding quality. Meanwhile, install the fastening sleeve 52 on the steel pipe A51 and fasten it to the steel pipe B53. Then, weld the steel plate base 54 and the stiffening rib 55 to the steel pipe B53 to ensure the stability of the structure. The socket bolt 56 is plugged into the plug hole on the lower chord ball 3 to form a permanent support node.

[0075] S5. The newly added steel beam 20 is fixed to the stiffening plate 29 of the bracket by bolts to form a stable connection. Subsequently, the newly added steel beam 20 is fixed to the pressure plate 8 on the structural column 1 by the screw 9 and the first bolt 28 to complete the load transfer path;

[0076] S6. The balance tie rod 6 is installed between the brackets, and the upper chord 21 and the lower chord 22 are connected by a first bolt 28;

[0077] S7. The load of the spatial structure is gradually transferred to the bracket structure through permanent supporting nodes to ensure the stability of the bracket structure of the entire system.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A space structure under-support bracket reinforcement structure, characterized in that: It comprises a structural column (1); a bracket assembly (2) arranged between two of the structural columns (1) and used to lift a steel structure (1-0) to transfer load force; and a support assembly (5) for supporting the steel structure (1-0) is symmetrically arranged at one end of the two structural columns (1); The steel structure (1-0) includes a connecting rod (3), a plurality of lower chord balls (4) arranged on the connecting rod (3), and the supporting assembly (5) includes a semicircular groove (57) connected to the plurality of lower chord balls (4), so that the lower chord balls (3) and the semicircular groove (57) are adapted to be connected and support and fix the steel structure (1-0).

2. A space structure under-support bracket reinforcement structure according to claim 1, characterized in that: A plurality of lower chord balls (4) are arranged on the connecting rod (3) at equal intervals, and a plug-in hole is formed in the middle of the lower chord ball (3).

3. A space structure under-support bracket reinforcement structure according to claim 1, characterized in that: The bracket assembly (2) comprises a newly added steel beam (20), an upper chord (21) and a lower chord (22) arranged between two of the newly added steel beams (20), a plurality of longitudinal straight web members (24) arranged between the upper chord (21) and the lower chord (22), and a longitudinal diagonal web member (23) arranged between the plurality of longitudinal straight web members (24).

4. A space structure under-support bracket reinforcement structure according to claim 3, characterized in that: The two bracket assemblies (2) also include a reinforcement structure, which includes a transverse horizontal upper web (25) and a transverse horizontal lower web (26), first bolts (28) respectively arranged at both ends of the transverse horizontal upper web (25) and the transverse horizontal lower web (26), and a plurality of stiffening plates (29) respectively arranged on the outer walls of the upper chord (21) and the lower chord (22), and transverse reinforcing diagonal webs (27) are cross-arranged between the plurality of stiffening plates (29).

5. The space structure under-support bracket reinforcement structure according to claim 1, characterized in that: The support assembly (5) includes a steel pipe A (51) and a steel pipe B (53), a fastening sleeve (52) arranged between the steel pipe A (51) and the steel pipe B (53), a steel plate base (54) arranged at one end of the steel pipe B (53), a stiffening rib (55) arranged on the steel plate base (54), and a socket bolt (56) arranged in the middle of the stiffening rib (55), and a semicircular groove (57) is formed at the top end of the stiffening rib (55) for connecting with the lower chord ball (4).

6. A space structure under-support bracket reinforcement structure according to claim 5, characterized in that: The semicircular groove (57) is provided with a rubber pad (58) for increasing the force balance between the lower chord ball (4) and the semicircular groove (57).

7. The space structure under-support bracket reinforcement structure according to claim 5, characterized in that: The inner wall of the fastening sleeve (52) is provided with a circle of expansion strips (59).

8. The space structure under-support bracket reinforcement structure according to claim 4, characterized in that: A balance tie rod (6) is provided between the plurality of bracket assemblies (2), and the balance tie rod (6) is connected to the upper chord rod (21) and the lower chord rod (22) via the first bolt (28) to connect the plurality of bracket assemblies (2).

9. The space structure under-support bracket reinforcement structure according to claim 1, characterized in that: Pressure plates (8) are arranged on both sides of the structural column (1), a screw rod (9) passes through the structural column (1) and the pressure plates (8), and second bolts (10) are arranged at both ends of the screw rod (9).

10. A method for reinforcing a space structure under-support bracket, characterized in that: A space structure under-support bracket reinforcement structure comprising any one of claims 2 to 9, wherein the method comprises the following steps: S1. Conduct on-site inspection to ensure that all construction conditions meet the requirements, including leveling the ground and clearing obstacles; S2. The bracket is manufactured in a factory or on site, and the upper chord (21) and the lower chord (22) are connected by the first bolt (28) through the transverse horizontal upper web member (25) and the transverse horizontal lower web member (26), and the upper chord (21) and the lower chord (22) are welded and connected with the longitudinal straight web member (24). Then, in the cross section, the transverse reinforcement diagonal web member (27) and the longitudinal straight web member (24) are connected and reinforced by the stiffening plate (29), and the longitudinal diagonal web member (23) and the longitudinal straight web member (24) are welded and reinforced in the longitudinal direction. At the same time, the two upper chords (21) are obliquely welded with the lower chord (22) and fixed on the stiffening plate (29), so as to form an inverted quadrangular pyramid or inverted triangular pyramid connection node; S3. Transport the prepared bracket to the construction site and install it in place according to the design drawings; S4. Weld the steel pipe A (51) to the bracket upper chord (21) and ensure the welding quality. At the same time, install the fastening sleeve (52) on the steel pipe A (51) and fasten it to the steel pipe B (53). Then, weld the steel plate base (54) and the stiffening rib (55) to the steel pipe B (53) to ensure the stability of the structure. The socket bolt (56) is plugged into the plug hole on the lower chord ball (3) to form a permanent support node. S5. The newly added steel beam (20) is fixed to the stiffening plate (29) of the bracket by bolts to form a stable connection, and then the newly added steel beam (20) is fixed to the pressure plate (8) on the structural column (1) by the screw rod (9) and the first bolt (28) to complete the load transfer path; S6. A balancing tie rod (6) is installed between the brackets, and the upper chord (21) and the lower chord (22) are connected by a first bolt (28); S7. The load of the spatial structure is gradually transferred to the bracket structure through permanent supporting nodes to ensure the stability of the bracket structure of the entire system.

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