A tree-shaped column-supported curtain wall structure for a large building and its construction method

Abstract

This invention discloses a tree-shaped column-supported curtain wall structure and construction method for large buildings, belonging to the field of large steel structure construction. It includes supporting columns and three main branch columns. One end of each of the three main branch columns is integrally formed and welded to the upper end of the supporting column. The other ends of the three main branch columns bend upwards and disperse into a tree shape. Each main branch column is equipped with several branch rods. An installation structure for the decorative curtain wall is also included. The installation structure includes an irregular support frame. Several connecting rods are provided between the inner side of the irregular support frame and the supporting columns, main branch columns, and branch rods. The decorative curtain wall is fixed to the irregular support frame by several connectors. The construction method includes steps S1-S9. The tree-shaped column steel structure of this invention, as a core supporting structure for large sites, large railway station buildings, etc., can achieve stable support for structures with large spans, large vertical height differences, and inconsistent shapes, effectively improving construction efficiency, convenience, and shortening the construction cycle.

Description

Technical Field

[0001] This invention relates to the field of large steel structure construction, specifically to a tree-shaped column-supported curtain wall structure and construction method for large buildings. Background Technology

[0002] With the continuous development of architecture and the deepening research in the field of biomimetic structures, traditional steel or concrete columns can no longer meet the requirements for supporting roof structures in large-scale steel structure projects. This leads to significant difficulties in the overall structural stress design of the roof and the construction of the steel structure. Moreover, tree-shaped columns are cost-effective and aesthetically pleasing. Therefore, large-scale "tree-shaped column" structures are increasingly being applied in the field of architectural engineering.

[0003] The large "tree-shaped column" is a combination of irregular steel structure and multi-curved stainless steel plate cladding. The process of hoisting, welding and forming involves multiple transformations of the system's stress characteristics. During construction, it is also necessary to consider complex working conditions such as the diurnal temperature difference in Chongqing's extremely hot region and the coupling effect of wind loads in the subtropical monsoon humid climate. Traditional steel structures and multi-curved stainless steel plates have low structural strength, and the installation methods can no longer meet the requirements. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a tree-shaped column-supported curtain wall structure and construction method for large buildings, solving problems such as the difficulty in constructing irregular and large steel structures and the low structural installation strength in existing technologies.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0006] A tree-shaped column-supported curtain wall structure for a large building is provided, comprising a supporting column, with three main branch columns at the top of the supporting column. One end of each of the three main branch columns is integrally formed and welded to the upper end of the supporting column, and the other end of each of the three main branch columns bends upward and disperses into a tree shape. Each main branch column is provided with several branch rods, which are interconnected in a cross manner. Several installation structures for mounting decorative curtain walls are provided on the supporting column, main branch columns, and branch rods. The installation structures include an irregular support frame surrounding the supporting column, main branch columns, or branch rods. Several connecting rods are provided between the inner side of the irregular support frame and the supporting column, main branch columns, and branch rods. The decorative curtain wall is fixed to the irregular support frame by several connectors.

[0007] Furthermore, a support rod is provided on the inner side of the corner of the irregular support frame, and the end of the connecting rod is fixedly connected to the support rod, with the support rod and the connecting rod forming a T-shape.

[0008] Furthermore, a fastener is provided at the upper end of the main branch column. The fastener includes a C-shaped first fastener and a second fastener. The first fastener and the second fastener are fastened to the main branch column by bolts. A semi-circular support plate is provided on the side of the second fastener. A first connecting block in the shape of an 8 is provided on the support plate. The end of the first connecting block is connected to the decorative curtain wall and the end of the first connecting block is welded to the support plate. A flexible PE gasket is provided between the inner side of the first fastener and the second fastener and the main branch column.

[0009] Furthermore, a crossbeam is welded to the lower end of the fastener, and the end of the crossbeam is welded to the external truss.

[0010] Furthermore, the connector includes a T-shaped first connector welded to an irregular support frame, a T-shaped second connector fixedly connected to the T-shaped first connector by bolts, a second connecting block welded to the T-shaped second connector, and the end of the second connecting block connected to the decorative curtain wall.

[0011] Furthermore, the second connecting block has an L-shaped cross-section, and stiffening plates are provided on the inner side of the decorative curtain wall. The stiffening plates are perpendicular to the decorative curtain wall, and ribs are provided vertically at the upper end of the stiffening plates. The second connecting block is fixedly connected to the ribs by bolts.

[0012] Furthermore, a vertical first square tube is welded to the external truss, and a second square tube is welded to both ends of the first square tube. The first square tube is perpendicular to the second square tube. Dustproof aluminum plates are installed on the outer surfaces of the first square tube and the second square tube. The dustproof aluminum plates are fixed to the side wall of the second square tube by rivets. The dustproof aluminum plates extend to the end of the decorative curtain wall and are fixed to the rib plate by rivets.

[0013] Furthermore, the extended end of the dustproof aluminum plate is set as an L-shaped bent section, and a first gap is provided between the bent section and the inner side of the decorative curtain wall. A connecting layer connecting the bent section and the dustproof aluminum plate is provided in the first gap, and a rubber sealing layer is provided on the connecting layer.

[0014] An aluminum transition plate is provided on the outside of the first gap. Both ends of the aluminum transition plate are L-shaped. A second gap is provided between the L-shaped structure at one end of the aluminum transition plate and the first gap. A connecting layer and a rubber sealing layer connecting the aluminum transition plate and the dustproof aluminum plate are also provided in the second gap.

[0015] The outer side of the dustproof aluminum plate is equipped with an insulation layer and a water-passing layer. A floor drain is installed on the water-passing layer, and the floor drain is connected to the drainage ditch through a water pipe. The end face of the insulation layer and the water-passing layer is sealed by the transition aluminum plate.

[0016] The L-shaped structure at the other end of the transition aluminum plate is fixed to the water-passing layer by expansion screws, and the L-shaped structure at the other end of the transition aluminum plate is provided with an upward-curving bend section, which is welded to the water-passing layer by welding points.

[0017] Furthermore, the dustproof aluminum plate between the second square tube and the decorative curtain wall is designed as a Z-shaped expansion joint.

[0018] A construction method for a tree-shaped column-supported curtain wall structure of the aforementioned large building includes the following steps:

[0019] S1: The support columns, main branch columns and branch rods are assembled and welded in sections off-site. After the section assembly and welding are completed, a 320-ton crawler crane is selected as the main lifting machinery for lifting.

[0020] S2: Erect temporary support frames on the installation site. Use guy ropes for temporary fixation when hoisting the temporary support frames. Weld the bottom of the temporary support frames to the embedded parts on the concrete structure of the installation site in a timely manner.

[0021] S3: Temporary support frames placed on the upper part of the concrete structure floor should be placed on the structural concrete beams and should not be in direct contact with the floor slab. Alternatively, steel transfer beams can be installed, with the temporary support frames welded to the transfer beams. The load-bearing support is then transferred to the concrete structural beams through the transfer beams. The transfer beams and concrete structural beams are fixedly connected using embedded parts.

[0022] S4: The upper part of the temporary support frame is equipped with a positioning steel plate connected to the truss. When the temporary support frame is installed in place, the center line of the temporary support frame is aligned with the center line of the foundation, and then the hook of the crawler crane is released.

[0023] S5: Next, adjust the position so that the center line of the base of the temporary support frame coincides with the center line of the foundation. After the verticality of the support column and the verticality of the diagonal support column meet the requirements, the installation of the temporary support frame is completed.

[0024] S6: Set the route and position of the main hoisting machinery according to the installation site, place roadbed boxes at the position to prevent damage to the floor slab, check the geometric dimensions of the support columns before hoisting, mark the cross center line of the support columns.

[0025] S7: During hoisting, first position the support column, install the connecting ear plate, and adjust the cross center lines of the upper and lower support columns to be consistent. Then, check the relationship between the two columns and the axis. After checking and adjusting, tension the guy ropes and weld them. Then, weld the main branch column and branch rod to the support column.

[0026] S8: Install external trusses:

[0027] When measuring and setting out the external truss, each support point on the external truss is horizontally projected from its spatial position onto the ground, and its three-dimensional spatial coordinates are transformed onto the ground in the Z-axis direction;

[0028] The position of each temporary support frame was measured on the ground using a total station. The cantilevered inner arc-shaped outer truss was projected as an arc on the horizontal plane, and the center lines of the upper chord and lower chord of the arc-shaped truss were projected as a straight line on the horizontal plane.

[0029] Before installation, temporary support frames are erected at the segment locations of the external truss. The center line of the external truss is projected onto the top assembly platform of each temporary support frame using a theodolite and marked. The elevation is transferred to the top of the temporary support frame using a level and a steel tape measure and marked. When the external truss is hoisted into place, the center line is aligned with the positioning line before the crane hook is released. Then the external truss is connected or welded to the branch rods and main branch columns.

[0030] S9: Then weld irregular support frames onto the support columns, main branch columns, and branch rods. The irregular support frames are designed according to the decorative shape. Finally, install the decorative curtain wall at the corresponding position onto the irregular support frames and weld the decorative curtain walls together.

[0031] The beneficial effects of this invention are as follows: The tree-shaped column steel structure of this invention, as the core supporting structure for large sites and large railway station buildings, can provide stable support for structures with large spans, significant vertical differences, and inconsistent shapes. It allows for reasonable segmented processing and on-site assembly using hoisting technology, effectively improving construction efficiency, convenience, and shortening the construction cycle. Furthermore, the entire supporting structure uses hyperboloidal points and multi-shaped aluminum panel curtain walls to construct the facade, allowing for flexible shape design. The installation of the decorative curtain wall is simple and also meets the aesthetic requirements of the site. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a tree-shaped column structure.

[0033] Figure 2 This is a structural diagram showing the connection between the decorative curtain wall and the irregular support frame.

[0034] Figure 3 Structural diagram for decorating the edges of a curtain wall.

[0035] Figure 4 for Figure 3 Structural diagram of the enlarged section A.

[0036] Among them, 1. Support column, 2. Main branch column, 3. Irregular support frame, 4. Connecting rod, 5. Branch rod, 6. Connecting layer, 7. Support rod, 8. First connecting block, 9. T-shaped first connector, 10. T-shaped second connector, 11. Bending section, 12. Rib plate, 13. Stiffener plate, 14. Decorative curtain wall, 15. Horizontal beam, 16. First fastener, 17. Second fastener, 18. Rubber sealing layer, 19. Second square tube, 20. First square tube, 21. Dustproof aluminum plate, 22. Expansion section, 23. Water pipe, 24. Floor drain, 25. Transition aluminum plate, 26. Second connecting block. Detailed Implementation

[0037] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0038] like Figures 1-4 As shown, a tree-shaped column-supported curtain wall structure for a large building includes a supporting column 1. Three main branch columns 2 are provided at the top of the supporting column 1. One end of each of the three main branch columns 2 is integrally formed and welded to the upper end of the supporting column 1. The other ends of the three main branch columns 2 bend upwards and disperse into a tree shape. Each main branch column 2 is provided with several branch rods 5, which are interconnected in a crisscross pattern. Several installation structures for mounting decorative curtain walls 14 are provided on the supporting column 1, the main branch columns 2, and the branch rods 5. The installation structures include an irregular support frame 3 surrounding the supporting column 1, the main branch columns 2, or the branch rods 5. Several connecting rods 4 are provided between the inner side of the irregular support frame 3 and the supporting column 1, the main branch columns 2, and the branch rods 5. The decorative curtain wall 14 is fixed to the irregular support frame 3 by several connectors.

[0039] The decorative curtain wall 14 can be installed around the irregular support frame 3, completely enclosing the supporting columns 1, main branch columns 2, and branch rods 5, ensuring the neatness and aesthetics of the facade and facilitating the facade's configuration. The entire tree-shaped column structure is stable, with the supporting columns 1, main branch columns 2, and branch rods 5 forming a unified whole.

[0040] In this embodiment, a support rod 7 is provided on the inner side of the corner of the irregular support frame 3, and the end of the connecting rod 4 is fixedly connected to the support rod 7. The support rod 7 and the connecting rod 4 form a T-shape. The T-shaped structure formed by the support rod 7 and the connecting rod 4 increases the structural strength at the corner of the irregular support frame 3, avoids deformation at this position, and also facilitates the welding of the connecting rod 4.

[0041] In this embodiment, a fastener is provided at the upper end of the main branch column 2. The fastener includes a C-shaped first fastener 16 and a second fastener 17. The first fastener 16 and the second fastener 17 are fastened to the main branch column 2 by bolts. A semi-circular support plate is provided on the side of the second fastener 17. A first connecting block 8 in a figure-eight shape is provided on the support plate. The end of the first connecting block 8 is connected to the decorative curtain wall 14, and the end of the first connecting block 8 is welded to the support plate. A flexible PE gasket is provided between the inner side of the first fastener 16 and the second fastener 17 and the main branch column 2. When installing the decorative curtain wall 14 on the top of the tree-shaped column, it is connected to the main branch column 2 by the fastener, which is convenient for installation and provides structural stability. The flexible PE gasket can effectively increase the deformation damping effect and prevent deformation under high stress conditions, ensuring the stable installation of the decorative curtain wall 14.

[0042] In this embodiment, a crossbeam 15 is welded to the lower end of the fastener, and the end of the crossbeam 15 is welded to the external truss.

[0043] The connector includes a T-shaped first connector 9 welded to the irregular support frame 3. A T-shaped second connector 10 is bolted to the T-shaped first connector 9. A second connecting block 26 is welded to the T-shaped second connector 10. The end of the second connecting block 26 is connected to the decorative curtain wall 14. The connector is designed in a T-shape, which increases the contact area with the corresponding connecting structure, facilitates welding, and ensures stability between the structures after welding.

[0044] In this embodiment, the second connecting block 26 has an L-shaped cross-section, resulting in high structural strength. A stiffening rib 13 is provided on the inner side of the decorative curtain wall 14, perpendicular to the curtain wall 14. A rib plate 12 is vertically arranged at the upper end of the stiffening rib 13. The second connecting block 26 is fixedly connected to the rib plate 12 by bolts. This avoids direct welding to the decorative curtain wall 14 and prevents deformation of the curtain wall 14.

[0045] In this embodiment, a vertical first square tube 20 is welded to the external truss, and second square tubes 19 are welded to both ends of the first square tube 20. The first square tube 20 and the second square tubes 19 are perpendicular to each other. Dustproof aluminum plates 21 are provided on the outer surfaces of the first square tube 20 and the second square tubes 19. The dustproof aluminum plates 21 are fixed to the side wall of the second square tubes 19 by rivets. The dustproof aluminum plates 21 extend to the end of the decorative curtain wall 14 and are fixed to the rib plate 12 by rivets. The edges of the decorative curtain wall 14 are sealed with dustproof aluminum plates 21, which have a certain dustproof function and protect the internal tree-shaped columns and various connecting support structures.

[0046] In this embodiment, the extended end of the dustproof aluminum plate 21 is configured as an L-shaped bent section 11. A first gap is provided between the bent section 11 and the inner side of the decorative curtain wall 14. A connecting layer 6 is provided within the first gap to connect the bent section 11 and the dustproof aluminum plate 21, and a rubber sealing layer 18 is provided on the connecting layer 6. This ensures a tight connection between the dustproof aluminum plate 21 and the decorative curtain wall 14, while also ensuring airtightness.

[0047] An aluminum transition plate 25 is provided on the outside of the first gap. Both ends of the aluminum transition plate 25 are L-shaped. A second gap is provided between the L-shaped structure at one end of the aluminum transition plate 25 and the first gap. A connecting layer 6 and a rubber sealing layer 18 connecting the aluminum transition plate 25 and the dustproof aluminum plate 21 are also provided in the second gap.

[0048] An insulation layer and a water-passing layer are provided on the outer side of the dustproof aluminum plate 21. A floor drain 24 is installed on the water-passing layer, and the floor drain 24 is connected to a drainage ditch through a water pipe 23. The transition aluminum plate 25 encloses the end faces of the insulation layer and the water-passing layer. The edge of the decorative curtain wall 14 is sealed by the dustproof aluminum plate 21, forming a certain sealing effect and good drainage effect.

[0049] The L-shaped structure at the other end of the transition aluminum plate 25 is fixed to the water-passing layer by expansion screws, and the L-shaped structure at the other end of the transition aluminum plate 25 is provided with an upward-curving bending section 11. The bending section 11 is welded to the water-passing layer by welding points, which facilitates the fixing and welding construction of the transition aluminum plate 25.

[0050] The dustproof aluminum plate 21 between the second square tube 19 and the decorative curtain wall 14 is set as a Z-shaped telescopic section 22, which provides a movable telescopic space and can resist small-amplitude vibrations or displacements.

[0051] The construction method for the tree-shaped column-supported curtain wall structure of the aforementioned large building includes the following steps:

[0052] S1: The support column 1, main branch column 2 and branch rod 5 are assembled and welded in sections off-site. After the section assembly and welding are completed, a 320-ton crawler crane is selected as the main lifting machinery for lifting.

[0053] S2: Erect temporary support frames on the installation site. Use guy ropes for temporary fixation when hoisting the temporary support frames. Weld the bottom of the temporary support frames to the embedded parts on the concrete structure of the installation site in a timely manner.

[0054] S3: Temporary support frames placed on the upper part of the concrete structure floor should be placed on the structural concrete beams and should not be in direct contact with the floor slab. Alternatively, steel transfer beams can be installed, with the temporary support frames welded to the transfer beams. The load-bearing support is then transferred to the concrete structural beams through the transfer beams. The transfer beams and concrete structural beams are fixedly connected using embedded parts.

[0055] S4: The upper part of the temporary support frame is equipped with a positioning steel plate connected to the truss. When the temporary support frame is installed in place, the center line of the temporary support frame is aligned with the center line of the foundation, and then the hook of the crawler crane is released.

[0056] S5: Next, adjust the position so that the center line of the base of the temporary support frame coincides with the center line of the foundation. After the verticality of the support column and the verticality of the diagonal support column meet the requirements, the installation of the temporary support frame is completed.

[0057] S6: Set the route and position of the main hoisting machinery according to the installation site, place roadbed boxes at the position to prevent damage to the floor slab, check the geometric dimensions of support column 1 before hoisting, mark the cross center line of support column 1.

[0058] S7: During hoisting, first position the support column 1, install the connecting ear plate, and adjust the cross center lines of the upper and lower support column 1 to be consistent. Then check the relationship between the two columns and the axis. After checking and adjusting, tension the guy ropes and weld them. Then weld the main branch column 2 and the branch rod 5 to the support column 1.

[0059] S8: Install external trusses:

[0060] When measuring and setting out the external truss, each support point on the external truss is horizontally projected from its spatial position onto the ground, and its three-dimensional spatial coordinates are transformed onto the ground in the Z-axis direction;

[0061] The position of each temporary support frame was measured on the ground using a total station. The cantilevered inner arc-shaped outer truss was projected as an arc on the horizontal plane, and the center lines of the upper chord and lower chord of the arc-shaped truss were projected as a straight line on the horizontal plane.

[0062] Before installation, temporary support frames are erected at the segment locations of the external truss. The center line of the external truss is projected onto the top assembly platform of each temporary support frame using a theodolite and marked. The elevation is transferred to the top of the temporary support frame using a level and a steel tape measure and marked. When the external truss is hoisted into place, the center line is aligned with the positioning line before the crane hook is released. Then the external truss is connected or welded to the branch rod 5 and the main branch column 2.

[0063] S9: Then weld irregular support frame 3 onto support column 1, main branch column 2 and branch rod 5. The irregular support frame 3 is designed according to the decorative shape. Finally, install the decorative curtain wall 14 at the corresponding position onto the irregular support frame 3 and weld the decorative curtain wall 14 together.

[0064] The construction method of this invention offers excellent design calculation and construction safety guarantees, ensuring high reliability and safety, and reducing the probability of safety accidents during construction. The stress and deformation of the steel structure both meet design requirements, ensuring structural safety and reliability.

[0065] The tree-shaped column steel structure of this invention serves as the core support structure for large sites and large railway station buildings. It can provide stable support for structures with large spans, significant vertical differences, and inconsistent shapes. Through reasonable segmentation and on-site assembly using hoisting technology, it effectively improves construction efficiency, is convenient and quick, and shortens the construction cycle. Furthermore, the entire support structure uses hyperboloid points and multi-shaped aluminum panel curtain walls to construct the facade, allowing for flexible design. The installation of the decorative curtain wall 14 is simple and also meets the aesthetic requirements of the site.

Claims

1. A tree-column supported curtain wall structure of a large building, characterized by, The system includes supporting columns, each topped with three main branch columns. One end of each main branch column is integrally formed and welded to the upper end of the supporting column. The other ends of each main branch column bend upwards and disperse into a tree-like shape. Each main branch column has several branch rods, which are interconnected in a crisscross pattern. Several installation structures for mounting decorative curtain walls are provided on the supporting columns, main branch columns, and branch rods. Each installation structure includes an irregular support frame surrounding the supporting columns, main branch columns, or branch rods. Several connecting rods are provided between the inner side of the irregular support frame and the supporting columns, main branch columns, and branch rods. The decorative curtain wall is fixed to the irregular support frame by several connectors.

2. The tree-column supported curtain wall structure of large building according to claim 1, wherein, A support rod is provided on the inner side of the corner of the irregular support frame, and the end of the connecting rod is fixedly connected to the support rod. The support rod and the connecting rod form a T-shape.

3. The tree-column supported curtain wall structure of large building according to claim 1, wherein, The upper end of the main branch column is provided with fasteners, which include a C-shaped first fastener and a second fastener. The first fastener and the second fastener are fastened to the main branch column by bolts. A semi-circular support plate is provided on the side of the second fastener. A first connecting block in the shape of an 8 is provided on the support plate. The end of the first connecting block is connected to the decorative curtain wall, and the end of the first connecting block is welded to the support plate. A flexible PE gasket is provided between the inner side of the first fastener and the second fastener and the main branch column.

4. The tree-shaped column-supported curtain wall structure for large buildings according to claim 3, characterized in that, The lower end of the fastener is welded with a crossbeam, and the end of the crossbeam is welded to the external truss.

5. The tree-shaped column-supported curtain wall structure for large buildings according to claim 3, characterized in that, The connector includes a T-shaped first connector welded to an irregular support frame, a T-shaped second connector fixedly connected to the T-shaped first connector by bolts, a second connecting block welded to the T-shaped second connector, and the end of the second connecting block connected to the decorative curtain wall.

6. The tree-shaped column-supported curtain wall structure for large buildings according to claim 5, characterized in that, The second connecting block has an L-shaped cross-section. The inner side of the decorative curtain wall is provided with stiffening plates, which are perpendicular to the decorative curtain wall. A rib is provided vertically at the upper end of the stiffening plate. The second connecting block is fixedly connected to the rib by bolts.

7. The tree-shaped column-supported curtain wall structure for large buildings according to claim 4, characterized in that, A vertical first square tube is welded to the external truss. Second square tubes are welded to both ends of the first square tube. The first square tube and the second square tube are perpendicular to each other. Dustproof aluminum plates are provided on the outer surfaces of the first square tube and the second square tube. The dustproof aluminum plates are fixed to the side wall of the second square tube by rivets. The dustproof aluminum plates extend to the end of the decorative curtain wall and are fixed to the rib plate by rivets.

8. The tree-shaped column-supported curtain wall structure for large buildings according to claim 7, characterized in that, The extended end of the dustproof aluminum plate is configured as an L-shaped bent section. A first gap is provided between the bent section and the inner side of the decorative curtain wall. A connecting layer connecting the bent section and the dustproof aluminum plate is provided in the first gap, and a rubber sealing layer is provided on the connecting layer. An aluminum transition plate is provided on the outside of the first gap. Both ends of the aluminum transition plate are L-shaped. A second gap is provided between the L-shaped structure at one end of the aluminum transition plate and the first gap. A connecting layer and a rubber sealing layer connecting the aluminum transition plate and the dustproof aluminum plate are also provided in the second gap. The outer side of the dustproof aluminum plate is provided with an insulation layer and a water-passing layer. A floor drain is provided on the water-passing layer. The floor drain is connected to a drainage ditch through a water pipe. The transition aluminum plate encapsulates the end faces of the insulation layer and the water-passing layer. The L-shaped structure at the other end of the transition aluminum plate is fixed to the water-passing layer by expansion screws, and the L-shaped structure at the other end of the transition aluminum plate is provided with an upward-curving bend section, which is welded to the water-passing layer by welding points.

9. The tree-shaped column-supported curtain wall structure for large buildings according to claim 8, characterized in that, The dustproof aluminum plate between the second square tube and the decorative curtain wall is set as a Z-shaped expansion joint.

10. A construction method for a tree-shaped column-supported curtain wall structure of a large building as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: The support columns, main branch columns and branch rods are assembled and welded in sections off-site. After the section assembly and welding are completed, a 320-ton crawler crane is selected as the main lifting machinery for lifting. S2: Erect temporary support frames on the installation site. Use guy ropes for temporary fixation when hoisting the temporary support frames. Weld the bottom of the temporary support frames to the embedded parts on the concrete structure of the installation site in a timely manner. S3: Temporary support frames placed on the upper part of the concrete structure floor should be placed on the structural concrete beams and should not be in direct contact with the floor slab. Alternatively, steel transfer beams can be installed, with the temporary support frames welded to the transfer beams. The load-bearing support is then transferred to the concrete structural beams through the transfer beams. The transfer beams and concrete structural beams are fixedly connected using embedded parts. S4: The upper part of the temporary support frame is equipped with a positioning steel plate connected to the truss. When the temporary support frame is installed in place, the center line of the temporary support frame is aligned with the center line of the foundation, and then the hook of the crawler crane is released. S5: Next, adjust the position so that the center line of the base of the temporary support frame coincides with the center line of the foundation. After the verticality of the support column and the verticality of the diagonal support column meet the requirements, the installation of the temporary support frame is completed. S6: Set the route and position of the main hoisting machinery according to the installation site, place roadbed boxes at the position to prevent damage to the floor slab, check the geometric dimensions of the support columns before hoisting, mark the cross center line of the support columns. S7: During hoisting, first position the support column, install the connecting ear plate, and adjust the cross center lines of the upper and lower support columns to be consistent. Then, check the relationship between the two columns and the axis. After checking and adjusting, tension the guy ropes and weld them. Then, weld the main branch column and branch rod to the support column. S8: Install external trusses: When measuring and setting out the external truss, each support point on the external truss is horizontally projected from its spatial position onto the ground, and its three-dimensional spatial coordinates are transformed onto the ground in the Z-axis direction; The position of each temporary support frame was measured on the ground using a total station. The cantilevered inner arc-shaped outer truss was projected as an arc on the horizontal plane, and the center lines of the upper chord and lower chord of the arc-shaped truss were projected as a straight line on the horizontal plane. Before installation, temporary support frames are erected at the segment locations of the external truss. The center line of the external truss is projected onto the top assembly platform of each temporary support frame using a theodolite and marked. The elevation is transferred to the top of the temporary support frame using a level and a steel tape measure and marked. When the external truss is hoisted into place, the center line is aligned with the positioning line before the crane hook is released. Then the external truss is connected or welded to the branch rods and main branch columns. S9: Then weld irregular support frames onto the support columns, main branch columns, and branch rods. The irregular support frames are designed according to the decorative shape. Finally, install the decorative curtain wall at the corresponding position onto the irregular support frames and weld the decorative curtain walls together.

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