An inner concave connecting joint applied to an umbrella-shaped structure

Abstract

The utility model discloses a kind of inner concave connecting joint applied to umbrella structure, including the connecting joint of the special-shaped steel column upper end being set to the lower part of umbrella structure, the connecting joint includes inner support part and outer support part, inner support part is connected with the round steel column of special-shaped steel column, outer support part is annular dentiform structure and is evenly distributed in the circumferential direction of inner support part, outer support part lower end is connected with the box room column of round steel column outer side, upper end is connected with the main beam of umbrella structure, outer support part is located at the outer side of inner support part and jointly constitutes funnel shape, the bottom surface and top surface of outer support part are inclined upward conical part, outer support part lower end vertical part, vertical part is connected between the conical part of outer support part by smooth arc part.The utility model can improve the bending resistance and support stability of connecting joint.

Description

Technical Field

[0001] This utility model relates to the field of steel structure technology, specifically to a concave connection node applied to umbrella-shaped structures, which is particularly suitable for support systems of urban landscape buildings (such as umbrella-shaped steel structures). Background Technology

[0002] In recent years, urban landscape architecture (such as umbrella-shaped cantilever structures) has increasingly demanded higher aesthetic standards for steel beams. The lower end of an umbrella-shaped structure consists of irregularly shaped steel columns, the upper end is a cantilever structure, and the middle is a connecting node. This connecting node transfers the force of the cantilever section to the irregularly shaped steel columns, playing a crucial role in supporting the structure. However, existing connecting nodes are prone to bending and lack sufficient bending resistance, resulting in insufficient support stability and consequently, insufficient stability of the umbrella-shaped structure. Furthermore, current technology cannot solve the water collection and drainage problems of inverted umbrella-shaped structures. Utility Model Content

[0003] The purpose of this invention is to provide a concave connection node for use in umbrella-shaped structures, thereby improving the bending resistance and support stability of the connection node.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following solution:

[0005] A concave connection node for an umbrella-shaped structure includes a connection node located at the upper end of an irregularly shaped steel column at the lower part of the umbrella-shaped structure. The connection node includes an inner support part and an outer support part. The inner support part is connected to the round steel column of the irregularly shaped steel column. The outer support part has a ring-shaped tooth structure distributed around the circumference of the inner support part. The lower end of the outer support part is adapted to connect with the box column outside the round steel column, and the upper end is connected to the main beam of the umbrella-shaped structure. The outer support part is located outside the inner support part and together they form a funnel shape. The bottom and top surfaces of the outer support part are upwardly tapered parts, and the lower end of the outer support part is a vertical part. The vertical part and the tapered part of the outer support part are connected by a smooth arc part.

[0006] In this design, the inner support is rigidly connected to the round steel column portion of the irregular steel column or integrally formed. The outer support is distributed in a ring-shaped tooth pattern, arranged around the inner support in a circumferential manner, together forming a funnel-shaped concave space. The inner support mainly supports the cantilevered part of the umbrella structure. The lower vertical part of the outer support is welded to the box column on the outside of the round steel column. The column diameter is customized according to the cross-sectional dimensions of the box column. The upper tapered part is fixed to the umbrella main beam with high-strength bolts or welding. The tapered angle matches the inclination angle of the main beam. The smooth arc-shaped part connects the vertical part and the tapered part. The inner support bears the vertical load, and the outer support disperses the horizontal component of the force to the box column through the toothed structure, forming a three-dimensional force transmission system of "column-beam-node". This improves the bending resistance and stability of the connection node, thereby enhancing the stability of the umbrella structure.

[0007] Optionally, the inner support is a cylindrical steel tube with the same diameter as the cylindrical steel column. Multiple first reinforcing ribs are distributed in a ring on the inner wall of the cylindrical steel tube, and multiple annular plates are distributed along the axial direction on the inner wall of the cylindrical steel tube. The annular plates and the first reinforcing ribs are interleaved.

[0008] Optionally, single-cell steel beams for connecting the secondary beams of the umbrella-shaped structure are distributed between two adjacent outer support parts.

[0009] Optionally, the external support is a multi-chamber steel beam. The multi-chamber steel beam is a box structure with an inner cavity, which is welded from multiple steel plates. The inner cavity is composed of multiple independent chambers formed by partitions. The chambers include a first chamber and a second chamber. The first chamber is located in the middle, and the second chambers are distributed on both sides of the first chamber. The top surface of the multi-chamber steel beam is a concave arc shape, and the bottom surface of the multi-chamber steel beam has an upper groove in the middle, with inclined surfaces on both sides of the upper groove.

[0010] Optionally, the multi-chamber steel beam is welded together from a top plate, side plates, a middle bottom plate, and side bottom plates. The top plate is concave arc-shaped, the side plates are distributed on both sides of the top plate, the side plates are parallel to the partitions, the two ends of the side bottom plates are connected to the partitions and the side plates respectively, and the two ends of the middle bottom plate are connected to the partitions.

[0011] Optionally, two partitions and two side bottom plates are provided. The two partitions are located between the two side plates. The upper ends of the two partitions are welded to the bottom surface of the top plate, and the lower ends of the two partitions are welded to both ends of the middle partition. The two partitions, the middle bottom plate, and the top surface form a first chamber.

[0012] Optionally, one end of the side bottom plate is welded to the bottom end of a side plate on one side, and the other end is welded to the bottom end of an adjacent partition plate, with the side bottom plate, partition plate, side plate, and top plate forming a second chamber.

[0013] Optionally, the cross-section of the single-cell steel beam is a hollow rectangle, and a concave arc-shaped plate is welded between the single-cell steel beam and the multi-cell steel beam. The arc-shaped plate, together with the sidewalls of the single-cell steel beam and the multi-cell steel beam, forms a box-like structure.

[0014] Optionally, an arc panel is provided between two adjacent outer support parts, and a second reinforcing rib is provided between the arc panel and the inner wall of the cylindrical steel cylinder.

[0015] Optionally, a third reinforcing rib is provided between the inner wall of the outer support and the outer wall of the inner support.

[0016] The beneficial effects of this utility model are:

[0017] 1. In this utility model, the inner support part is directly and rigidly connected to the round steel column part of the irregular steel column or integrally formed. The outer support part is distributed in a ring-shaped tooth pattern and is arranged around the inner support part in a circumferential manner, together forming a funnel-shaped concave space. The inner support part mainly supports the cantilever part of the umbrella structure. The lower vertical part of the outer support part is connected to the box column on the outside of the round steel column by welding. The column diameter is customized according to the cross-sectional size of the box column. The upper tapered part is fixed to the umbrella main beam by high-strength bolts or welding. The tapered angle matches the inclination angle of the main beam. The smooth arc part connects the vertical part and the tapered part. The inner support part bears the vertical load. The outer support part disperses the horizontal component force to the box column through the toothed structure, forming a three-dimensional force transmission system of "column-beam-node", which improves the bending resistance and stability of the connection node, thereby enhancing the stability of the umbrella structure.

[0018] 2. The cross-section of the external support is a multi-box steel beam. Its concave arc-shaped top surface can distribute the load more evenly and reduce local stress concentration. Under vertical load, the arc-shaped top surface, through geometric optimization, makes the bending moment distribution more gradual, thereby improving the bending stiffness.

[0019] The internal cavity of the multi-chamber steel beam is divided into multiple independent chambers by partitions, forming a "frame-shear wall" effect, which effectively suppresses local buckling of the steel plate.

[0020] The partition not only enhances the overall stability of the steel beam, but also effectively resists shear deformation and improves torsional stiffness. The groove in the middle of the bottom surface reduces the structure's self-weight, while the sloping design on both sides creates a "compression arch" effect when the steel beam is under pressure, further dispersing stress and improving compressive stability.

[0021] The curved flanges reduce stress abruptness points through smooth transition, lowering the risk of fatigue crack initiation at welded joints. The multi-chamber structure distributes stress across multiple chambers, preventing premature failure due to stress concentration in a single chamber. Compared to solid-web steel beams, the multi-chamber design significantly reduces material usage while maintaining the section moment of inertia. By optimizing the diaphragm spacing and steel plate thickness, steel consumption can be reduced while meeting load-bearing requirements.

[0022] The grooves and slopes on the bottom surface of the multi-chamber steel beams form a pleated skin. This pleated skin is directly formed from the structural steel plate, eliminating the need for external decorative panels such as aluminum plates, reducing the cost of decorative materials, and simplifying the construction process. In terms of architectural appearance, the concave and convex pleats (such as arc-shaped and rectangular recesses) can be used as a decorative layer, eliminating the need for additional decorative materials, reducing the amount of decorative materials used, lowering the component's self-weight, and meeting green building standards. The pleated skin also acts as a stiffening structure, reducing the width-to-thickness ratio of the plates and suppressing the risk of buckling. Attached Figure Description

[0023] Figure 1 This is a top view of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0025] Figure 3 This is a structural diagram of a multi-chamber steel beam.

[0026] Figure 4 A structural diagram showing the connection nodes and the umbrella-shaped structure after assembly.

[0027] Figure 5 This is a top view of the umbrella-shaped structure;

[0028] Figure 6 A 3D view of an irregularly shaped steel column;

[0029] Figure 7 This is a top view of the cover plate.

[0030] Reference numerals: 1-Inner support, 2-Outer support, 201-Top plate, 202-Partition plate, 203-Side plate, 204-Side bottom plate, 205-Intermediate bottom plate, 206-First chamber, 207-Second chamber, 208-Upper groove, 3-Conical part, 4-Smooth arc-shaped part, 5-Vertical part, 6-First reinforcing rib plate, 7-Annular plate, 8-Third reinforcing rib plate, 9-Irregular steel column, 901-Box column, 902-Round steel column, 903-Trapezoidal box, 904-Rectangular box, 905-Groove, 10-Polygonal side beam, 11-Second reinforcing rib plate, 12-Arc panel, 13-Arc plate, 14-Single-chamber steel beam, 15-Secondary beam, 16-Connecting node, 17-Main beam, 18-Guide plate, 19-Drainage pipe, 20-Cover plate, 21-Drainage outlet. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0032] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

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

[0034] Example

[0035] A concave connection node applied to an umbrella-shaped structure includes a connection node 16 located at the upper end of an irregularly shaped steel column 9 at the lower part of the umbrella-shaped structure. The connection node 16 includes an inner support part 1 and an outer support part 2. The inner support part 1 is connected to the round steel column 902 of the irregularly shaped steel column 9. The outer support part 2 has an annular tooth structure distributed around the circumference of the inner support part 1. The lower end of the outer support part 2 is adapted to and connected to the box column 901 outside the round steel column 902, and the upper end is connected to the main beam 17 of the umbrella-shaped structure. The outer support part 2 is located outside the inner support part 1 and together they form a funnel shape. The bottom and top surfaces of the outer support part 2 are upwardly tapered parts 3. The lower end of the outer support part 2 has a vertical part 5. The vertical part 5 and the tapered part 3 of the outer support part 2 are connected by a smooth arc part 4.

[0036] In this plan, such as Figures 1-6 As shown, the inner support part 1 is directly rigidly connected to the round steel column 902 of the irregular steel column 9 or integrally formed. The outer support part 2 is distributed in a ring-shaped tooth pattern and is arranged around the inner support part 1 in a circumferential manner, together forming a funnel-shaped concave space. The inner support part 1 mainly supports the cantilevered part of the umbrella structure. The lower vertical part 5 of the outer support part 2 is connected to the box column 901 on the outside of the round steel column 902 by welding. The column diameter is customized according to the cross-sectional dimensions of the box column 901. The upper tapered part 3 is fixed to the umbrella main beam 17 by high-strength bolts or welding. The tapered angle matches the inclination angle of the main beam 17. The smooth arc part 4 connects the vertical part 5 and the tapered part 3. The inner support part 1 bears the vertical load, and the outer support part 2 distributes the horizontal component force to the box column 901 through the toothed structure, forming a three-dimensional force transmission system of "column-beam-node", which improves the bending resistance and stability of the connection node 16, thereby enhancing the stability of the umbrella structure.

[0037] Furthermore, such as Figure 7 As shown, a cover plate 20 is welded to the top surface of the funnel-shaped structure formed by the outer support part 2. The cover plate 20 is formed by welding two semi-circular plates together. Figure 2As shown, a downwardly recessed guide plate 18 is welded to the inner wall of the upper end of the round steel column 902. The guide plate 18 is welded and sealed to the inner wall of the round steel column 902 in all directions. A drain outlet 21 is provided at the bottom recess of the guide plate 18. A drain pipe 19 is welded to the drain outlet 21. The drain pipe 19 extends downward to below the ground and connects to the municipal sewage pipe. The rainwater above flows through the channel in the middle of the funnel-shaped structure to the recessed area in the middle of the guide plate 18, then enters the drain pipe 19 through the drain outlet 21, and finally is discharged to the municipal sewage pipe through the drain pipe 19.

[0038] Furthermore, the inner support part 1 is a cylindrical steel tube with the same diameter as the cylindrical steel column 902. Multiple first reinforcing ribs 6 are distributed in a ring on the inner wall of the cylindrical steel tube, and multiple annular plates 7 are distributed along the axial direction on the inner wall of the cylindrical steel tube. The annular plates 7 and the first reinforcing ribs 6 are interleaved.

[0039] Specifically, both the annular plate 7 and the first reinforcing rib plate 6 are welded to the inner wall of the cylindrical steel cylinder to withstand circumferential tensile stress and prevent the cylindrical steel cylinder from becoming unstable under axial pressure. The first reinforcing rib plate 6 and the annular plate 7 form a "truss effect," distributing the local load to the entire cylinder. The annular plate 7 enhances the axial stiffness and resists local buckling under bending moment.

[0040] Furthermore, single-cell steel beams 14 for connecting the secondary beams 15 of the umbrella-shaped structure are distributed between two adjacent outer support parts 2.

[0041] Specifically, such as Figure 5 As shown, the secondary beam 15 of the umbrella-shaped structure is a Y-shaped beam. The single-cell steel beam 14 has a rectangular cross-section and is welded or bolted to one end of the Y-shaped beam. The other two ends of the Y-shaped beam are welded or bolted to the polygonal side beam 10 of the umbrella-shaped structure. The outer support 2 is bolted or welded to the main beam 17 of the umbrella-shaped structure. The main beam 17 is also a multi-cell steel beam with the same shape and structure as the outer support 2. The main beam 17 is also called a cantilever beam. The cylindrical steel tube has the same dimensions as the cylindrical steel tube of the umbrella-shaped structure. The outer box column 901 of the round steel column 902, formed integrally or welded, is composed of multiple trapezoidal box columns 903 and rectangular box columns 904. One side of each trapezoidal box column 903 is recessed towards the centerline of the round steel column 902 to form a "treasure chest" shape. The trapezoidal box columns 903 are evenly distributed around the circumference of the round steel column 902. A rectangular box column 904 is located between two trapezoidal box columns 903. The trapezoidal box columns 903 and rectangular box columns 904 form a continuous annular fold shape, increasing the bending resistance of the irregularly shaped steel column 9. The trapezoidal box columns 903 and rectangular box columns 904 are constructed by welding multiple steel plates.

[0042] Furthermore, the outer support 2 is a multi-chamber steel beam, which is a box structure with an inner cavity welded from multiple steel plates. The inner cavity is composed of multiple independent chambers formed by partitions 202. The chambers include a first chamber 206 and a second chamber 207. The first chamber 206 is located in the middle, and the second chambers 207 are distributed on both sides of the first chamber 206. The top surface of the multi-chamber steel beam is a concave arc shape, and the bottom surface of the multi-chamber steel beam has an upper groove 208 in the middle, with inclined surfaces on both sides of the upper groove 208.

[0043] Furthermore, the multi-chamber steel beam is welded together from a top plate 201, side plates 203, a middle bottom plate 205, and a side bottom plate 204. The top plate 201 is concave arc-shaped, the side plates 203 are distributed on both sides of the top plate 201, the side plates 203 are parallel to the partition plate 202, the two ends of the side bottom plate 204 are connected to the partition plate 202 and the side plates 203 respectively, and the two ends of the middle bottom plate 205 are connected to the partition plate 202.

[0044] Furthermore, each of the partition 202 and the side bottom plate 204 is provided with two partitions. The two partitions 202 are located between the two side plates 203. The upper ends of the two partitions 202 are welded to the bottom surface of the top plate 201, and the lower ends of the two partitions 202 are welded to both ends of the middle partition 202. The two partitions 202, the middle bottom plate 205, and the top surface form the first chamber 206.

[0045] Furthermore, one end of the side bottom plate 204 is welded to the bottom end of the side plate 203 on one side, and the other end is welded to the bottom end of the adjacent partition 202. The side bottom plate 204, the partition 202, the side plate 203, and the top plate 201 form a second chamber 207.

[0046] Specifically, such as Figure 3 As shown, the cross-section of the outer support 2 is a multi-box steel beam. Its concave arc-shaped top surface can distribute the load more evenly and reduce local stress concentration. Under vertical load, the arc-shaped top surface optimizes the bending moment distribution through geometric optimization, thereby improving the bending stiffness.

[0047] The inner cavity of the multi-chamber steel beam is divided into multiple independent chambers by the partition plate 202, forming a "frame-shear wall" effect, which effectively suppresses local buckling of the steel plate.

[0048] The partition plate 202 not only enhances the overall stability of the steel beam, but also effectively resists shear deformation and improves torsional stiffness. The upper groove 208 in the middle of the bottom surface can reduce the self-weight of the structure, while the sloping design on both sides creates a "pressure arch" effect when the steel beam is under pressure, further dispersing stress and improving compressive stability. The upper groove 208 corresponds to the groove 905 on the surface of the irregular steel column 9, which is located between two trapezoidal chambers.

[0049] The curved flanges reduce stress abruptness points through smooth transition, lowering the risk of fatigue crack initiation at welded joints. The multi-chamber structure distributes stress across multiple chambers, preventing premature failure due to stress concentration in a single chamber. Compared to solid-web steel beams, the multi-chamber design significantly reduces material usage while maintaining the section moment of inertia. By optimizing the spacing of the diaphragms 202 and the thickness of the steel plates, the amount of steel used can be reduced while meeting load-bearing requirements.

[0050] The grooves 208 and slopes on the bottom surface of the multi-chamber steel beams form a pleated skin. This pleated skin is directly formed from the structural steel plate, eliminating the need for external decorative panels such as aluminum plates, reducing the cost of decorative materials, and simplifying the construction process. In terms of architectural appearance, the concave and convex pleats (such as arc-shaped and rectangular recesses) can be used as a decorative layer, eliminating the need for additional decorative materials, reducing the amount of decorative materials used, lowering the component's self-weight, and meeting green building standards. The pleated skin also acts as a stiffening structure, reducing the width-to-thickness ratio of the plates and suppressing the risk of buckling.

[0051] Furthermore, the cross-section of the single-cell steel beam 14 is a hollow rectangular shape, and a concave arc-shaped plate 13 is welded between the single-cell steel beam 14 and the multi-cell steel beam. The arc-shaped plate 13, together with the side wall of the single-cell steel beam 14 and the side wall of the multi-cell steel beam, forms a box-like structure.

[0052] Specifically, the single-cell steel beam 14 and the multi-cell steel beam are welded together by a concave arc plate 13 to form a rigid transition, avoiding stress concentration from direct connection. The arc plate 13 connects the single-cell and multi-cell steel beams and together with the side walls forms a closed box, improving the stiffness of the joint.

[0053] Furthermore, an arc panel 12 is provided between two adjacent outer support parts 2, and a second reinforcing rib 11 is provided between the arc panel 12 and the inner wall of the cylindrical steel cylinder.

[0054] Specifically, such as Figure 1 As shown, the arc panel 12 serves as a transitional connector between the outer support parts 2, transmitting the horizontal shear force (such as wind load and seismic action) between adjacent outer support parts 2, constraining the radial deformation of the cylindrical steel cylinder, and improving the overall torsional stiffness; as the mounting base of the second reinforcing rib plate 11, it forms a "plate-rib" collaborative force-bearing system. The second reinforcing rib plate 11 enhances the local connection stiffness between the arc panel 12 and the cylindrical steel cylinder, and the curvature of the arc panel 12 is adapted to the concave curvature of one side of the trapezoidal box chamber 903.

[0055] Furthermore, a third reinforcing rib plate 8 is provided between the inner wall of the outer support part 2 and the outer wall of the inner support part 1.

[0056] Specifically, such as Figure 1 As shown, the outer support 2 and the inner support 1 are transformed into a composite load-bearing whole through the third reinforcing rib plate 8, which significantly improves the lateral stiffness of the structure.

[0057] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present utility model and within the spirit and principles of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A concave connecting node applied to an umbrella-shaped structure, characterized in that, The structure includes a connection node (16) at the upper end of the irregular steel column (9) located at the lower part of the umbrella-shaped structure. The connection node (16) includes an inner support part (1) and an outer support part (2). The inner support part (1) is connected to the round steel column (902) of the irregular steel column (9). The outer support part (2) has a ring-shaped tooth structure distributed around the inner support part (1). The lower end of the outer support part (2) is adapted to the box column (901) outside the round steel column (902), and the upper end is connected to the main beam (17) of the umbrella-shaped structure. The outer support part (2) is located outside the inner support part (1) and together they form a funnel shape. The bottom and top surfaces of the outer support part (2) are obliquely upward conical parts (3). The lower end of the outer support part (2) has a vertical part (5). The vertical part (5) is connected to the conical part (3) of the outer support part (2) through a smooth arc part (4).

2. The concave connection node applied to an umbrella-shaped structure according to claim 1, characterized in that, The inner support part (1) is a cylindrical steel cylinder with the same diameter as the cylindrical steel column (902). Multiple first reinforcing ribs (6) are distributed in a ring on the inner wall of the cylindrical steel cylinder. Multiple annular plates (7) are distributed along the axial direction on the inner wall of the cylindrical steel cylinder. The annular plates (7) and the first reinforcing ribs (6) are interleaved.

3. The concave connection node applied to an umbrella-shaped structure according to claim 1, characterized in that, Between two adjacent outer support parts (2), there are single-cell steel beams (14) for connecting the secondary beams (15) of the umbrella structure.

4. The concave connection node applied to an umbrella-shaped structure according to claim 3, characterized in that, The outer support part (2) is a multi-chamber steel beam. The multi-chamber steel beam is a box structure with an inner cavity welded from multiple steel plates. The inner cavity is composed of multiple independent chambers formed by partitions (202). The chambers include a first chamber (206) and a second chamber (207). The first chamber (206) is located in the middle, and the second chamber (207) is distributed on both sides of the first chamber (206). The top surface of the multi-chamber steel beam is a concave arc shape, and the bottom surface of the multi-chamber steel beam has an upper groove (208) in the middle. The upper groove (208) has inclined surfaces on both sides.

5. A concave connecting node applied to an umbrella-shaped structure according to claim 4, characterized in that, The multi-chamber steel beam is constructed by welding a top plate (201), side plates (203), a middle bottom plate (205), and a side bottom plate (204). The top plate (201) is concave arc-shaped. The side plates (203) are distributed on both sides of the top plate (201). The side plates (203) are parallel to the partition plate (202). The two ends of the side bottom plate (204) are connected to the partition plate (202) and the side plate (203) respectively. The two ends of the middle bottom plate (205) are connected to the partition plate (202).

6. A concave connecting node applied to an umbrella-shaped structure according to claim 5, characterized in that, The partition (202) and the side bottom plate (204) are each provided in two pieces. The two partitions (202) are located between the two side plates (203). The upper ends of the two partitions (202) are welded to the bottom surface of the top plate (201), and the lower ends of the two partitions (202) are welded to both ends of the middle partition (202). The two partitions (202), the middle bottom plate (205), and the top surface form the first chamber (206).

7. A concave connecting node applied to an umbrella-shaped structure according to claim 5, characterized in that, One end of the side bottom plate (204) is welded to the bottom end of the side plate (203) on one side, and the other end is welded to the bottom end of the adjacent partition (202). The side bottom plate (204), the partition (202), the side plate (203), and the top plate (201) form a second chamber (207).

8. The concave connection node applied to an umbrella-shaped structure according to claim 1, characterized in that, The cross-section of the single-cell steel beam (14) is a hollow rectangle. A concave arc plate (13) is welded between the single-cell steel beam (14) and the multi-cell steel beam. The arc plate (13), the side wall of the single-cell steel beam (14), and the side wall of the multi-cell steel beam form a box-like structure.

9. A concave connecting node applied to an umbrella-shaped structure according to claim 1, characterized in that, An arc panel (12) is provided between two adjacent outer support parts (2), and a second reinforcing rib (11) is provided between the arc panel (12) and the inner wall of the cylindrical steel cylinder.

10. A concave connecting node applied to an umbrella-shaped structure according to claim 1, characterized in that, A third reinforcing rib (8) is provided between the inner wall of the outer support part (2) and the outer wall of the inner support part (1).

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