Outer side cantilever structure for curved surface building and mounting method

Abstract

The invention relates to the technical field of constructional engineering, and discloses an outer side cantilever structure for a curved-surface building and a mounting method.The curved-surface building comprises a plurality of structural columns, the structural columns are arranged at intervals along the outer edge extending path of the curved-surface building when being observed in the vertical direction, and the outer side cantilever structure comprises a cantilever assembly and a connecting assembly, the cantilever beam comprises a mounting section, a transition section and a connecting section which are sequentially connected from inside to outside, the mounting section is connected with the structural column, a connecting portion is arranged on the connecting section, the upper end face of the connecting section is lower than the upper end face of the mounting section, the upper end face of the transition section is obliquely arranged, and the inner side edge of the upper end face of the transition section is connected with the upper end face of the mounting section. The outer side edge of the upper end surface of the transition section is connected with the upper end surface of the connecting section; and the connecting assembly comprises a connecting beam, and the two ends of the connecting beam are connected with the corresponding connecting parts of the two adjacent cantilever beams correspondingly. According to the outer side cantilever structure for the curved surface building and the mounting method, it can be guaranteed that transition between the plate descending area and the non-plate descending area is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and particularly to an outer cantilever structure and installation method for a curved building. Background Art

[0002] In a curved building, in order to achieve the smooth shape of the outer facade and the structural load-bearing requirements, a thickened cantilever concrete floor slab is often set in the form of "lowering the slab" around the building. The lowering the slab design thickens the section by locally lowering the floor elevation to form an outer cantilever structure, so as to simultaneously meet the functions such as curtain wall load transfer, curved shape transition and spatial form coordination.

[0003] However, the construction in the lowered slab area has difficulties in the structural transition between the lowered slab area and the non-lowered slab area: there are sudden changes in elevation and differences in cross-sectional thickness between the lowered slab area and the non-lowered slab area. In traditional construction, a stepped formwork is generally used for connection, which is likely to cause problems such as non-compact concrete pouring and stress concentration, weakening the structural integrity, and the formwork erection is difficult and inefficient.

[0004] In the prior art, the construction party mostly relies on densely arranging I-beam cantilever frameworks and complex reinforcement measures to deal with the above problems. However, this method causes significant material waste and is difficult to fundamentally solve the bottlenecks in the accuracy and efficiency of the lowered slab construction. Therefore, there is an urgent need for an integrated lowered slab structure and construction technology to simplify the transition joints and optimize the process connection while ensuring structural safety and accuracy. Summary of the Invention

[0005] The object of the present invention is to provide an outer cantilever structure and installation method for a curved building, which can ensure a smooth transition between the lowered slab area and the non-lowered slab area structurally.

[0006] To achieve the above object, the technical solution provided by the present invention is as follows:

[0007] The first aspect of the present invention provides an outer cantilever structure for a curved building. The curved building includes a plurality of structural columns. When observed in the up-down direction, the plurality of structural columns are arranged at intervals along the extension path of the outer edge of the curved building, and includes:

[0008] A cantilever assembly, the cantilever assembly includes a cantilever beam, the cantilever beam includes an installation section, a transition section and a connection section connected in sequence from inside to outside. The installation section is connected to the structural column. A connection portion is provided on the connection section. The upper end surface of the connection section is lower than the upper end surface of the installation section. The upper end surface of the transition section is inclined. The inner edge of the upper end surface of the transition section is connected to the upper end surface of the installation section, and the outer edge of the upper end surface of the transition section is connected to the upper end surface of the connection section.

[0009] A connection assembly, the connection assembly includes a connection beam, and both ends of the connection beam are respectively connected to the corresponding connection portions of two adjacent cantilever beams.

[0010] Furthermore, the cantilever beam also includes two extension sections, which are respectively arranged on both sides of the connecting section on the outer edge extension path of the curved building, and the connecting part is a hollow steel pipe, which is sleeved and welded on the extension section.

[0011] Furthermore, the connecting beam is a hollow steel pipe, the end of the connecting portion away from the extension section is provided with a plurality of first welding holes spaced circumferentially, the end of the connecting beam is provided with a plurality of second welding holes spaced circumferentially, and the first welding holes are connected to the second welding holes in a one-to-one correspondence.

[0012] Furthermore, a welding frame is provided inside the connection between the connecting beam and the connecting part, and the welding frame includes a main body and a plurality of pads arranged on the main body, and the pads correspond one-to-one to the gaps between the connecting beam and the connecting part.

[0013] Furthermore, part of the ends of the cushion strip pass through the first welding hole and the second welding hole from inside to outside.

[0014] Furthermore, a first floor deck support is provided at the connection between the connecting section and the transition section, the first floor deck support is connected to the upper end surface of the connecting portion, and a second floor deck support is provided on the upper end surface of the connecting beam, and the upper end surfaces of the first floor deck support and the second floor deck support are both flush with the installation section.

[0015] Furthermore, the connecting assembly also includes a connecting plate, a first extension plate is provided on the outer edge of the connecting portion, a second extension plate is provided on the outer edge of the connecting beam, the connecting plate is arranged on the connecting beam and the connecting portion, the two ends of the connecting plate are respectively connected to the first extension plate and the second extension plate, and the outer edges of the connecting plate, the first extension plate and the second extension plate are smoothly connected.

[0016] Furthermore, a first rib is welded between the first extension plate and the connection portion, and a second rib is welded between the second extension plate and the connection beam.

[0017] A second aspect of the present invention provides an installation method for installing the curved building external cantilever structure onto the curved building, comprising:

[0018] S1. Installing the cantilever beam on the structural column;

[0019] S2, sleeve the connecting parts onto the extension sections of the cantilever beams and fix them by welding;

[0020] S3. Fix the welding frame at the end of the connecting part, and then pre-connect the connecting part and the connecting beam through the auxiliary installation device;

[0021] S4. Weld and fix the connecting part and the connecting beam by the full-penetration weld method. After the weld solidifies, remove the auxiliary installation device;

[0022] S5. Weld and connect the connecting plate with the connecting beam, the connecting part, the first extension plate, and the second extension plate.

[0023] Compared with the prior art, the curved building outer cantilever structure and installation method in the embodiment of the present invention have the following beneficial effects: The cantilever beam is successively divided into an installation section, a transition section, and a connection section from inside to outside. The upper end surface of the transition section is inclined to connect the installation section and the connection section, and the upper end surface of the connection section is lower than that of the installation section. The inclined design of the transition section directly corresponds to the slope requirement of the slab lowering area, and the smooth connection between the slab lowering area and the non-slab lowering area is realized through the transition section, eliminating the stress concentration problem caused by the traditional step-like transition, ensuring the continuity of the structural force and the compactness of the concrete pouring. The inclined surface of the transition section can be directly used as the support reference for the formwork of the slab lowering area, without additional reinforcement or complex formwork splicing, reducing the formwork time and material waste; The cantilever beam and the connecting beam adopt a modular design and are quickly assembled through the connecting part, supporting factory prefabrication and on-site rapid assembly, greatly reducing high-altitude welding or complex reinforcement operations. Description of the Drawings

[0024] Figure 1 is the detail drawing of the curved building and the outer cantilever structure for the curved building in the embodiment of the present invention;

[0025] Figure 2 is the structural schematic diagram of the structural column, the cantilever component, and the connecting component in the embodiment of the present invention;

[0026] Figure 3 is the structural schematic diagram of the cantilever component in the embodiment of the present invention;

[0027] Figure 4 is the structural schematic diagram of the connecting component in the embodiment of the present invention;

[0028] Figure 5 is Figure 4 the partial enlarged view at A;

[0029] Figure 6 is the cross-sectional view of the structural column and the cantilever component in the first embodiment of the present invention;

[0030] Figure 7 is the structural schematic diagram of the structural column and the cantilever component in the second embodiment of the present invention;

[0031] Figure 8It is a schematic structural diagram of the structural column and the cantilever component in the third embodiment of the present invention.

[0032] In the figure, 1 is the structural column;

[0033] 2 is the cantilever component; 21 is the cantilever beam; 211 is the installation section; 212 is the transition section; 213 is the connection section; 214 is the extension section; 215 is the connection part; 2151 is the first through-welding hole; 216 is the first extension plate; 217 is the first rib plate;

[0034] 3 is the connection component; 31 is the connection beam; 311 is the second through-welding hole; 312 is the second extension plate; 313 is the second rib plate;

[0035] 4 is the welding frame; 41 is the main body; 42 is the cushion strip;

[0036] 5 is the first floor slab support;

[0037] 6 is the second floor slab support;

[0038] 7 is the auxiliary installation device;

[0039] 8 is the connecting plate. Specific embodiments

[0040] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0041] In the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "lateral", "longitudinal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and is not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation of the present invention. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0042] In the description of the present invention, the terms "provided with", "set", "connected", "placed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, terms such as "first", "second", etc. are mainly used to distinguish different devices, components or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, components or parts. Unless otherwise specified, the meaning of "a plurality of" is two or more.

[0044] The technical solution of the present invention will be further described below in conjunction with the embodiments and the drawings.

[0045] As Figure 1-8 shown, the first aspect of the embodiment of the present invention provides an outer cantilever structure for a curved building. The curved building includes a plurality of structural columns 1. When observed in the up and down direction, the plurality of structural columns 1 are arranged at intervals along the extension path of the outer edge of the curved building, and includes:

[0046] A cantilever assembly 2, the cantilever assembly 2 includes a cantilever beam 21, the cantilever beam 21 includes an installation section 211, a transition section 212 and a connection section 213 connected in sequence from inside to outside. The installation section 211 is connected to the structural column 1. A connection portion 215 is provided on the connection section 213. The upper end surface of the connection section 213 is lower than the upper end surface of the installation section 211. The upper end surface of the transition section 212 is inclined. The inner edge of the upper end surface of the transition section 212 is connected to the upper end surface of the installation section 211, and the outer edge of the upper end surface of the transition section 212 is connected to the upper end surface of the connection section 213;

[0047] A connection assembly 3, the connection assembly 3 includes a connection beam 31, and both ends of the connection beam 31 are respectively connected to the corresponding connection portions 215 of two adjacent cantilever beams 21.

[0048] Based on the above technical solution, the cantilever beam 21 is sequentially divided into an installation section 211, a transition section 212 and a connection section 213 from inside to outside. Among them, the upper end surface of the transition section 212 is inclined to connect the installation section 211 and the connection section 213, and the upper end surface of the connection section 213 is lower than the upper end surface of the installation section 211. The inclined design of the transition section 212 directly corresponds to the slope requirement of the slab lowering area, and the smooth connection between the slab lowering area and the non-slab lowering area is realized through the transition section 212, eliminating the stress concentration problem caused by the traditional stepped transition, ensuring the continuity of the structural force and the compactness of the concrete pouring. The inclined surface of the transition section 212 can directly serve as the support reference for the formwork of the slab lowering area, without additional reinforcement or complex formwork splicing, reducing the formwork time and material waste; the cantilever beam 21 and the connection beam 31 adopt a modular design and are quickly assembled through the connection portion 215, supporting factory prefabrication and on-site quick assembly, greatly reducing high-altitude welding or complex reinforcement operations.

[0049] Specifically, the cantilever beam 21 is of I-shaped steel structure.

[0050] Embodiment 1:

[0051] If the horizontal distance between the structural column 1 and the corresponding curved building is relatively close, the installation section 211 of the cantilever beam 21 can be directly welded to the structural column 1.

[0052] Embodiment 2:

[0053] If the horizontal distance between the structural column 1 and the corresponding curved building is relatively far, an I-beam can be provided on the structural column 1, and the installation section 211 of the cantilever beam 21 and the structural column 1 are connected through a bolt, nut, and steel plate structure.

[0054] Embodiment 3:

[0055] If the curvature of some positions of the curved building is relatively large, at least two cantilever beams 21 can be provided on the structural column 1 corresponding to the position.

[0056] Preferably, the cantilever beam 21 further includes two extension sections 214. The two extension sections 214 are respectively arranged on both sides of the extension path of the connecting section 213 along the outer edge of the curved building. The connecting part 215 is a hollow steel pipe, and the connecting part 215 is sleeved and welded on the extension section 214.

[0057] The socket connection between the hollow steel pipe and the extension section 214 can pre-position the subsequent welding of the hollow steel pipe and the extension section 214, without relying on manual measurement or repeated adjustment of their positions. Moreover, the physical limit formed by the socket connection can inhibit the relative displacement between the hollow steel pipe and the extension section 214 caused by thermal stress during the welding process, ensuring the welding accuracy; reducing the link of adding temporary fixtures for fixation, reducing the construction complexity and safety risks.

[0058] More preferably, the connecting beam 31 is a hollow steel pipe. A plurality of first over-welding holes 2151 are arranged at intervals along the circumferential direction at the end of the connecting part 215 facing away from the extension section 214. A plurality of second over-welding holes 311 are arranged at intervals along the circumferential direction at the end of the connecting beam 31. The first over-welding holes 2151 and the second over-welding holes 311 are in one-to-one correspondence and communication.

[0059] Through the alignment and communication of the plurality of first over-welding holes 2151 and the second over-welding holes 311, the communication position of the two holes provides a filling space for the welding material. During welding, the communicating holes of each first over-welding hole 2151 and the second over-welding hole 311 are filled in sequence, and finally a continuous welding point chain is formed in the circumferential direction to form a closed circular weld, increasing the weld area, enabling the load between the connecting part 215 and the connecting beam 31 to be stably transmitted, avoiding the stress concentration problem of single-sided welding, and improving the tensile, shear, and torsional resistance of the welding position; moreover, the first over-welding holes 2151 and the second over-welding holes 311 are strictly in one-to-one correspondence, which can be used as a positioning reference before welding, assist in positioning, shorten the alignment time, and improve the construction efficiency.

[0060] More preferably, a welding frame 4 is provided inside the joint of the connecting beam 31 and the connecting portion 215. The welding frame 4 includes a main body 41 and a plurality of cushion strips 42 provided on the main body 41. The cushion strips 42 correspond one by one to the gaps at the joints of the connecting beam 31 and the connecting portion 215.

[0061] More preferably, the ends of some of the cushion strips 42 penetrate outwards from the inside through the first over-welding hole 2151 and the second over-welding hole 311.

[0062] During the welding process, the cushion strips 42 of the welding frame 4 are embedded in the gaps between the connecting beam 31 and the connecting portion 215, and their ends penetrate through the over-welding holes to form physical limits. The cushion strips 42, as rigid support bodies, directly contact the molten solder, and restrict the unnecessary flow of the molten solder through mechanical blocking, forcing the molten metal to fill only along the communication channels of the preset first over-welding hole 2151 and the second over-welding hole 311, avoiding solder overflow or collapse, which may lead to out-of-control weld shapes. When the weld cools and shrinks, the structure of the cushion strips 42 can offset its shrinkage stress, avoiding cracks or warping deformation inside the weld.

[0063] Preferably, a first floor slab support member 5 is provided at the joint of the connecting section 213 and the transition section 212. The first floor slab support member 5 is connected to the upper end surface of the connecting portion 215. A second floor slab support member 6 is provided on the upper end surface of the connecting beam 31. The upper end surfaces of the first floor slab support member 5 and the second floor slab support member 6 are both flush with the installation section 211.

[0064] Specifically, both the first floor slab support member 5 and the second floor slab support member 6 are angle steels, and the angle steels are both arranged in an inverted "L" shape, and the horizontal sides of the angle steels extend inwards.

[0065] The first floor slab support member 5 and the second floor slab support member 6, together with the transition section 212, constitute a slab lowering operation, thereby increasing the thickness of the concrete floor slab at the outer edge. The operation is simple, and the angle steels used are standard parts, which can be prefabricated in the factory. Only the construction of the concrete floor slab needs to be carried out at the construction site, avoiding the risk of high-altitude formwork support, and the construction efficiency is high; the angle steels are arranged in an inverted "L" shape, and the horizontal sides of the angle steels extend inwards. The horizontal sides of the angle steels can support the steel bar structure of the floor slab, and the vertical sides of the angle steels can form the concrete structure of the thickened floor slab in the transition area.

[0066] Preferably, the connecting assembly 3 further includes a connecting plate 8. A first extension plate 216 is provided on the outer edge of the connecting portion 215, and a second extension plate 312 is provided on the outer edge of the connecting beam 31. The connecting plate 8 is arranged on the connecting beam 31 and the connecting portion 215. The two ends of the connecting plate 8 are respectively connected to the first extension plate 216 and the second extension plate 312, and the outer edges of the connecting plate 8, the first extension plate 216 and the second extension plate 312 are smoothly connected.

[0067] The connecting plate 8, the first extension plate 216, and the second extension plate 312 form a closed load path, enhancing the overall rigidity and stability of the outer cantilever structure, effectively dispersing the load, reducing the risk of local deformation, and the first extension plate 216, the second extension plate 312, and the connecting plate 8 can be flexibly adjusted according to the curvature shape of the building exterior, so that the outer edge of the outer cantilever structure precisely corresponds to the contour of the curved building, maintaining the smoothness of the building appearance.

[0068] More preferably, a first rib plate 217 is welded between the first extension plate 216 and the connecting portion 215, and a second rib plate 313 is welded between the second extension plate 312 and the connecting beam 31.

[0069] The first rib plate 217 and the second rib plate 313 form a triangular strengthening structure, which can enhance the flexural, shear, and torsional stiffness of the first extension plate 216, the second extension plate 312, and the connecting plate 8, avoiding local deformation; the rib plates can optimize their arrangement angles according to the stress direction, enabling the first extension plate 216, the second extension plate 312, and the connecting plate 8 to adapt to dynamic multi-directional loads such as wind vibration and seismic action.

[0070] The second aspect of the embodiments of the present invention provides an installation method for installing an outer cantilever structure for a curved building onto a curved building, including:

[0071] S1. Install the cantilever beam 21 on the structural column 1;

[0072] S2. Sleeve the connecting portions 215 onto the extension segments 214 of the cantilever beam 21 respectively and weld them in place;

[0073] S3. Fix the welding frame 4 at the end of the connecting portion 215, and then pre-connect the connecting portion 215 and the connecting beam 31 through the auxiliary installation device 7;

[0074] S4. Weld and fix the connecting portion 215 and the connecting beam 31 by means of full penetration welding, and remove the auxiliary installation device 7 after the weld has solidified;

[0075] S5. Weld the connecting plate 8 to the connecting beam 31, the connecting portion 215, the first extension plate 216, and the second extension plate 312.

[0076] In a specific embodiment, the auxiliary installation device 7 includes a first mounting plate disposed on the upper end surface of the connecting beam 31, a second mounting plate, and a third mounting plate disposed on the upper end surface of the connecting portion 215. A first through hole is provided on the first mounting plate, a second through hole is provided on the second mounting plate, a third through hole and a fourth through hole are provided on the third mounting plate, and the first through hole and the third through hole are detachably connected by bolts and nuts, and the second through hole and the fourth through hole are detachably connected by bolts and nuts.

[0077] Modular components (such as the cantilever beam 21, the connecting part 215, etc.) can be prefabricated in the factory and quickly assembled on-site, significantly reducing the time and risk of high-altitude operations, reducing material waste, and reusing auxiliary devices to reduce construction costs.

[0078] In summary, the embodiment of the present invention provides an outer cantilever structure and an installation method for a curved building. The cantilever beam 21 is sequentially divided into an installation section 211, a transition section 212, and a connection section 213 from inside to outside. The upper end surface of the transition section 212 is inclined to connect the installation section 211 and the connection section 213, and the upper end surface of the connection section 213 is lower than that of the installation section 211. The inclined design of the transition section 212 directly corresponds to the slope requirement of the slab lowering area, and the slab lowering area and the non-slab lowering area are smoothly connected through the transition section 212, eliminating the stress concentration problem caused by the traditional stepped transition, ensuring the continuity of structural force and the compactness of concrete pouring. The inclined surface of the transition section 212 can directly serve as the support reference for the formwork of the slab lowering area, without additional reinforcement or complex formwork splicing, reducing formwork time and material waste; the cantilever beam 21 and the connecting beam 31 adopt a modular design and are quickly assembled through the connecting part 215, supporting factory prefabrication and rapid on-site assembly, significantly reducing high-altitude welding or complex reinforcement operations.

[0079] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. An external cantilever structure for a curved building, the curved building comprising a plurality of structural columns (1), wherein the plurality of structural columns (1) are arranged at intervals along an outer edge extension path of the curved building when viewed from top to bottom, and characterized in that: include: A cantilever assembly (2), the cantilever assembly (2) comprising a cantilever beam (21), the cantilever beam (21) comprising a mounting section (211), a transition section (212) and a connecting section (213) connected in sequence from the inside to the outside, the mounting section (211) being connected to the structural column (1), the connecting section (213) being provided with a connecting portion (215), the upper end surface of the connecting section (213) being lower than the upper end surface of the mounting section (211), the upper end surface of the transition section (212) being inclined, the inner side edge of the upper end surface of the transition section (212) being connected to the upper end surface of the mounting section (211), and the outer side edge of the upper end surface of the transition section (212) being connected to the upper end surface of the connecting section (213); A connection assembly (3), the connection assembly (3) comprising a connection beam (31), the two ends of the connection beam (31) being respectively connected to corresponding connection portions (215) of two adjacent cantilever beams (21).

2. The outer cantilever structure for curved buildings according to claim 1, characterized in that: The cantilever beam (21) further comprises two extension sections (214), the two extension sections (214) being respectively arranged on both sides of the connection section (213) on the outer extension path of the curved building, the connection portion (215) being a hollow steel pipe, and the connection portion (215) being sleeved on and welded to the extension section (214).

3. The outer cantilever structure for curved buildings according to claim 2, characterized in that: The connecting beam (31) is a hollow steel pipe, the end of the connecting portion (215) away from the extension section (214) is provided with a plurality of first welding holes (2151) at intervals along the circumferential direction, the end of the connecting beam (31) is provided with a plurality of second welding holes (311) at intervals along the circumferential direction, and the first welding holes (2151) are connected to the second welding holes (311) in a one-to-one correspondence.

4. The outer cantilever structure for curved buildings according to claim 3, characterized in that: A welding frame (4) is provided inside the connection between the connecting beam (31) and the connecting portion (215), wherein the welding frame (4) comprises a main body (41) and a plurality of cushion strips (42) arranged on the main body (41), wherein the cushion strips (42) correspond one to one with the gaps at the connection between the connecting beam (31) and the connecting portion (215).

5. The outer cantilever structure for curved buildings according to claim 4, characterized in that: The ends of part of the cushion strip (42) pass through the first welding hole (2151) and the second welding hole (311) from the inside to the outside.

6. The outer cantilever structure for curved buildings according to claim 1, characterized in that: A first floor deck support member (5) is provided at the connection between the connecting section (213) and the transition section (212); the first floor deck support member (5) is connected to the upper end surface of the connecting portion (215); a second floor deck support member (6) is provided on the upper end surface of the connecting beam (31); the upper end surfaces of the first floor deck support member (5) and the second floor deck support member (6) are both flush with the installation section (211).

7. The outer cantilever structure for curved buildings according to claim 1, characterized in that: The connection assembly (3) further comprises a connection plate (8), a first extension plate (216) is provided on the outer edge of the connection portion (215), a second extension plate (312) is provided on the outer edge of the connection beam (31), the connection plate (8) is arranged on the connection beam (31) and the connection portion (215), two ends of the connection plate (8) are respectively connected to the first extension plate (216) and the second extension plate (312), and the outer edges of the connection plate (8), the first extension plate (216) and the second extension plate (312) are smoothly connected.

8. The outer cantilever structure for curved buildings according to claim 7, characterized in that: A first rib plate (217) is welded between the first extension plate (216) and the connection portion (215), and a second rib plate (313) is welded between the second extension plate (312) and the connection beam (31).

9. A method for installing the external cantilever structure for a curved building according to any one of claims 1 to 8 onto the curved building, characterized in that: include: S1, installing the cantilever beam (21) on the structural column (1); S2, sleeve the connecting parts (215) onto the extension sections (214) of the cantilever beams (21) respectively and fix them by welding; S3, fixing the welding frame (4) to the end of the connecting portion (215), and then pre-connecting the connecting portion (215) and the connecting beam (31) by means of an auxiliary mounting device (7); S4, welding the connection portion (215) and the connection beam (31) to fix them by full penetration welding, and removing the auxiliary installation device (7) after the weld is solidified; S5. Connecting the connecting plate (8), the connecting beam (31), the connecting portion (215), the first extension plate (216), and the second extension plate (312) by welding.

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