Ultra-large type multi-layer cantilever steel structure and construction method thereof

Abstract

The invention discloses an ultra-large type multi-layer cantilever steel structure and a construction method thereof.The ultra-large type multi-layer cantilever steel structure comprises a cantilever steel structure body and a main steel structure body, and the cantilever steel structure body is arranged on the main steel structure body in a cantilever mode and located at the corner of the main steel structure body; the overhanging steel structure comprises overhanging huge columns, overhanging trusses and overhanging inclined struts, the overhanging trusses are arranged in an up-down layered mode, the overhanging huge columns are arranged at the inner ends of the overhanging trusses and located at the corners of the overhanging steel structure, and the overhanging inclined struts pull and support the overhanging huge columns and the overhanging trusses. The overhanging structure is formed by the overhanging huge columns and the overhanging trusses, the overhanging structure is tied through the overhanging inclined struts, the stress stability and the structure safety of the overhanging structure are guaranteed, meanwhile, the overhanging inclined struts are tied through the tying inclined struts, the stability of the overhanging structure is further improved, and the overhanging effect is improved. An ultra-large cantilever structure is formed through a simple structure, and the construction cost and the structural complexity are effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of super large cantilever steel structure, and particularly relates to a super large multi-layer cantilever steel structure and a construction method thereof. BACKGROUND

[0002] The development of building technology also gives birth to various unique building structures, such as various cantilever structures with different shapes. The cantilever structure not only has the aesthetic appearance brought by the unique shape, but also increases the space inside the building, so it is widely used. However, due to the special stress of the cantilever structure, the size of the cantilever structure cannot be set too large, and complex structures and large-size beams and columns are needed to ensure the stability of the cantilever structure, resulting in high cost and construction difficulty. Therefore, a cantilever structure which can ensure the stability of the structure and has the advantages of convenient construction, safety and stability is needed. The present application provides a super large multi-layer cantilever steel structure and a construction method thereof to solve the above problems. SUMMARY

[0003] The present application provides a super large multi-layer cantilever steel structure and a construction method thereof, which sets up a diagonal brace to pull together the cantilever structure, improves the stability of the cantilever structure and ensures the safety of the structure.

[0004] The technical scheme adopted by the present application to solve the above technical problems is as follows: A super large multi-layer cantilever steel structure, comprising a cantilever steel structure and a main body steel structure, the cantilever steel structure is cantilevered on the main body steel structure and located at the corner of the main body steel structure; The cantilever steel structure comprises a cantilever giant column, a cantilever truss and a cantilever diagonal brace, the cantilever truss is arranged in layers from top to bottom, the outer end of the cantilever truss is connected to the main body steel structure, the cantilever giant column is arranged on the inner end of the cantilever truss and located at the corner of the cantilever steel structure, the inner end of the cantilever diagonal brace is connected to the cantilever giant column and connected to the cantilever truss at the lowermost layer, the outer end of the cantilever diagonal brace is connected to the main body steel structure and connected to the cantilever truss at the uppermost layer, and the cantilever diagonal brace connects all the cantilever trusses.

[0005] Further, the main body steel structure comprises a support column, a pull-in diagonal brace and a layered truss, the support column is vertically and spacedly arranged on the lower structure, the layered truss is arranged between the support columns, the top end of the pull-in diagonal brace is connected to the layered truss at the uppermost layer and connected to the outer end of the cantilever diagonal brace, and the bottom end of the pull-in diagonal brace is connected to the layered truss at the lowermost layer.

[0006] Further, the cantilever diagonal brace, the pull-in diagonal brace and the layered truss at the lowermost layer are connected to each other to form a triangular frame, and the top end of the triangular frame is connected to the layered truss at the uppermost layer.

[0007] Further, the main steel structure further comprises reinforcing struts, the reinforcing struts are symmetrically arranged, top ends of the reinforcing struts are respectively connected at the connecting nodes of the cantilevered inclined braces and the layered trusses and the connecting nodes of the tie-in inclined braces and the layered trusses, and bottom ends of the reinforcing struts are connected at the connecting nodes of the struts and the layered trusses.

[0008] Further, the cantilevered trusses are arranged on both sides of the cantilevered giant columns and are perpendicular to each other.

[0009] Further, the cantilevered trusses are arranged correspondingly to the layered trusses.

[0010] Further, the cantilevered inclined braces comprise first support sections and second support sections, the first support sections are arranged in the cantilevered steel structure, and the second support sections are arranged in the main steel structure.

[0011] Further, the cantilevered giant columns comprise giant column units, the giant column units are connected in sequence to form the cantilevered giant columns, and the giant column units are arranged correspondingly to the cantilevered trusses.

[0012] Further, the cantilevered giant columns, the cantilevered trusses, the cantilevered inclined braces, the tie-in inclined braces and the layered trusses are all box-shaped steel structures.

[0013] A construction method of an ultra-large multi-layer cantilevered steel structure, comprising the following steps, S1, component prefabrication: prefabricating components, the components are prefabricated into connecting node components and beam column components; S2, main steel structure construction: first, constructing the lower structure of the main steel structure, and then constructing the upper structure after the construction is completed; When constructing the upper structure of the main steel structure, the components are installed layer by layer from bottom to top, the struts and the layered trusses are first installed, and then the reinforcing struts, the tie-in inclined braces and the second support sections are installed; S3, cradle construction: installing a cradle, the cradle is used as an installation foundation of the cantilevered giant columns; S4, cantilevered steel structure lower construction: first, installing the giant column unit at the bottom end of the cantilevered giant columns, the giant column unit at the bottom end is installed on the cradle, then installing the lowermost cantilevered truss, connecting the giant column unit at the bottom end with the main steel structure through the cantilevered truss, and then installing the components layer by layer from bottom to top, the giant column units and the cantilevered trusses are first installed, and then the cantilevered inclined braces are installed; S5, cradle removal: after the construction of the lower two layers of cantilevered trusses is completed, the cantilevered giant columns are connected with the main steel structure through the cantilevered trusses, and then the cradle is removed.

[0014] S6, cantilevered steel structure lower construction: the components are installed layer by layer, the giant column units are first installed, and then the cantilevered trusses are installed, until the cantilevered steel structure is constructed.

[0015] The present application has the following advantages: The cantilever structure is formed by the cantilever giant column and the cantilever truss, and the cantilever structure is tied by the cantilever inclined braces to ensure the stress stability and structural safety of the cantilever structure, and the cantilever inclined braces are tied by the tie-in inclined braces to further improve the stability of the cantilever structure, so that a super-large cantilever structure is formed by a simple structure, and the construction cost and structural complexity are effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the overall structure of the present application; Figure 3 It is a schematic diagram of the connection state of the cantilever steel structure and the main steel structure of the present application; Figure 4 It is a schematic diagram of the connection state of the main steel structure of the present application; Figure 5 It is a schematic diagram of the main steel structure of the present application; Figure 6 It is a schematic diagram of the cantilever steel structure of the present application; Figure 7 It is a schematic diagram of the bottom end giant column unit state of the cantilever steel structure of the present application during construction; Figure 8 It is a schematic diagram of the cantilever truss state of the cantilever steel structure of the present application during construction.

[0017] Reference signs: 100, cantilever steel structure; 200, main steel structure; 1, cantilever giant column; 2, cantilever truss; 3, cantilever inclined brace; 31, first support section; 32, second support section; 4, support column; 5, tie-in inclined brace; 6, layered truss; 7, reinforcing support column. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the specification. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0019] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0020] As shown in Figure 1 , 2 , 3, a super large multi-layer cantilever steel structure, comprising a cantilever steel structure 100 and a main body steel structure 200, the cantilever steel structure 100 is cantilevered on the main body steel structure 200 and located at the corner of the main body steel structure 200. It is actually applied to a certain frame shear wall structure, which includes steel reinforced concrete frame column, shear wall component and cantilever steel truss, the main structure includes five layers of frame shear wall structure on the ground and the cantilever steel structure 100 and the main body steel structure 200 arranged thereon, the main body steel structure 200 is arranged in five layers, including the 6th-8th layer, the equipment layer and the top truss layer, the cantilever steel structure 100 is arranged in four layers, the 6th layer is suspended, including the 7th-8th layer, the equipment layer and the top truss layer, the cantilever steel structure 100 is arranged at the corner of the main body steel structure 200, the cantilever length is about 25m, the connection of the four-layer cantilever steel structure 100 is realized through the cantilever giant column 1, and the triangular structure is formed by using the cantilever inclined brace 3 and the tie-in inclined brace 5 to strengthen the structural stability of the super large cantilever steel structure and ensure the safety of the overall structure.

[0021] As shown in Figure 1 , 2 , 3, 6, the cantilever steel structure 100 comprises a cantilever giant column 1, a cantilever truss 2 and a cantilever inclined brace 3, the cantilever truss 2 is arranged in layers from top to bottom, and there are four layers in total, the uppermost layer is a double-layer truss, the outer end of the cantilever truss 2 is connected to the main body steel structure 200, the cantilever giant column 1 is arranged on the inner end of the cantilever truss 2 and located at the corner of the cantilever steel structure 100, forming an L-shaped structure with the cantilever truss 2, the inner end of the cantilever inclined brace 3 is connected to the cantilever giant column 1 and connected to the lowermost cantilever truss 2, the outer end of the cantilever inclined brace 3 is connected to the main body steel structure 200 and connected to the uppermost cantilever truss 2, and the cantilever inclined brace 3 connects all the cantilever trusses 2.

[0022] In order to ensure the structural stability of the cantilever steel structure 100, the cantilever inclined brace 3, the tie-in inclined brace 5, the lowermost layered truss 6 and the cantilever truss 2 form a triangular structure, the layered truss 6 and the cantilever truss 2 are correspondingly and continuously arranged to form a whole horizontal truss, the outer end of the cantilever inclined brace 3 is connected with the top end of the tie-in inclined brace 5, the inner end of the cantilever inclined brace 3 is connected with one end of the whole horizontal truss, the bottom end of the tie-in inclined brace 5 is connected with the other end of the whole horizontal truss to form a triangular structure, the tie-in and support of the cantilever steel structure 100 are realized, and the structure of the cantilever steel structure 100 is kept stable.

[0023] As shown in Figure 1 , 2 , 3, 4, 5, further, the main body steel structure 200 comprises a support column 4, a tie-in inclined brace 5 and a layered truss 6, the support column 4 is vertically and spacedly arranged on the lower structure, the layered truss 6 is arranged between the support columns 4, the top end of the tie-in inclined brace 5 is connected with the uppermost layered truss 6 and the outer end of the cantilever inclined brace 3, and the bottom end of the tie-in inclined brace 5 is connected with the lowermost layered truss 6.

[0024] Further, the cantilever inclined brace 3, the tie-in inclined brace 5 and the lowermost layered truss 6 are connected with each other to form a triangular frame, the top end of the triangular frame is connected with the uppermost layered truss 6, and the lowermost layered truss 6 and the cantilever truss 2 serve as the bottom side of the triangular frame.

[0025] As shown in Figure 4 , 5 Further, the main body steel structure 200 further comprises a reinforcing support column 7, the reinforcing support column 7 serves to support the cantilever inclined brace 3 and the tie-in inclined brace 5 and reinforce the structural stability, the reinforcing support column 7 is symmetrically arranged, two reinforcing support columns 7 are arranged in each group, the top end of one reinforcing support column 7 is connected with the connecting node of the cantilever inclined brace 3 and the layered truss 6, the top end of the other reinforcing support column 7 is connected with the connecting node of the tie-in inclined brace 5 and the layered truss 6, and the bottom ends of the two reinforcing support columns 7 are connected with the connecting node of the same support column 4 and the layered truss 6 to form a branch structure, thereby improving the support effect of the cantilever inclined brace 3 and the tie-in inclined brace 5 and improving the overall stability of the structure.

[0026] Further, the cantilever truss 2 is arranged on both sides of the cantilever giant column 1, and the cantilever trusses 2 on both sides of the cantilever giant column 1 are perpendicular to each other to form an L-shaped cantilever structure.

[0027] Further, the cantilever truss 2 is correspondingly and continuously arranged with the layered truss 6.

[0028] As shown in Figure 5 , 6As shown, further, the cantilever inclined brace 3 comprises a first support section 31 and a second support section 32, the first support section 31 is located in the cantilever steel structure 100, and the second support section 32 is located in the main body steel structure 200, and the first support section 31 and the second support section 32 are continuously and correspondingly arranged.

[0029] Further, the cantilever giant column 1 comprises a giant column unit, and the giant column units are connected in sequence to form the cantilever giant column 1, and the giant column units are correspondingly arranged with the cantilever truss 2.

[0030] Further, the cantilever giant column 1, the cantilever truss 2, the cantilever inclined brace 3, the tie-in inclined brace 5 and the layered truss 6 are all box-type steel structures.

[0031] As shown in Figure 1 , 3 , 7, 8, a construction method of a super-large multi-layer cantilever steel structure, comprising the following steps, S1, component prefabrication: prefabricating components, prefabricating components into connection node components and beam column components; When prefabricating components, the components that exist in intersection are prefabricated into connection node components, and the components between adjacent connection node components are prefabricated into separate beam column components, thereby reducing the connection operation between components and improving construction efficiency; S2, main body steel structure construction: first, the lower structure of the main body steel structure 200, i.e. the frame shear wall structure of the five upper floors, is constructed, and after the construction is completed, the upper structure construction, i.e. the construction of the main body steel structure 200, is performed; When constructing the upper structure of the main body steel structure 200, the columns 4 and the layered trusses 6 are first installed layer by layer from bottom to top, and then the reinforcing columns 7, the tie-in inclined braces 5 and the second support sections 32 are installed; S3, cradle construction: installing a cradle, and taking the cradle as the installation basis of the cantilever giant column 1; When constructing the cantilever steel structure 100, the cantilever giant column 1 is first installed by using the cradle, and the cantilever truss 2 is constructed based on the cantilever giant column 1 and the main body steel structure 200 that has been constructed, so as to ensure the construction safety of the cantilever truss 2 and realize the accurate installation of the cantilever truss 2, which is more stable and safe compared with the mode of first installing the cantilever truss 2 and then butting the cantilever giant column 1; S4, lower construction of the cantilever steel structure: first, the giant column unit at the bottom end of the cantilever giant column 1 is installed, the giant column unit at the bottom end is installed on the cradle, then the lowermost cantilever truss 2 is installed, the giant column unit at the bottom end is connected with the main body steel structure 200 through the cantilever truss 2, then the giant column units and the cantilever trusses 2 are installed layer by layer from bottom to top, and then the cantilever inclined braces 3 are installed; S5, the cradle is removed: after the two lower cantilever trusses 2 are constructed, the cantilever giant column 1 is connected with the main steel structure 200 through the cantilever trusses 2, and the structure itself can maintain stability, so the lower structure is used as support to construct the upper structure, and the cradle is removed; S6, the lower cantilever steel structure is constructed: the layered installation is adopted, the giant column unit is installed first, then the cantilever truss 2 is installed, and until the cantilever steel structure 100 is constructed.

[0032] Further, when the cantilever truss 2 is constructed in steps S5 and S6, the single-pipe support mode is adopted to construct, the 200*10mm single pipe is installed on the lower cantilever truss 2 first, the upper cantilever truss 2 is supported by the single pipe, and the installation of the cantilever truss 2 is realized; in actual construction, two vertically arranged single pipes are a group, the bottom end of the single pipe group is bolted on the lower cantilever truss 2, a deformation space is reserved at the top, then the cantilever truss 2 is hoisted, one end of the cantilever truss 2 is connected with the installed structure, the other end is erected on the single pipe, the connection of the cantilever truss 2 is performed, then the installation of the cantilever truss 2 connected therewith is performed, after the cantilever truss 2 connected therewith is installed, the single pipe is removed.

[0033] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and range of the equivalent elements of the claims are intended to be embraced in the present application, and any reference signs in the claims should not be considered as limiting the claims involved.

Claims

1. A super-large multi-layer cantilevered steel structure, characterized by: It includes a cantilevered steel structure (100) and a main steel structure (200), wherein the cantilevered steel structure (100) is cantilevered on the main steel structure (200) and located at the corner of the main steel structure (200); The cantilever steel structure (100) includes a cantilever mega-column (1), a cantilever truss (2), and a cantilever brace (3). The cantilever truss (2) is arranged in upper and lower layers. The outer end of the cantilever truss (2) is connected to the main steel structure (200). The cantilever mega-column (1) is located on the inner end of the cantilever truss (2) and is located at the corner of the cantilever steel structure (100). The inner end of the cantilever brace (3) is connected to the cantilever mega-column (1) and is connected to the lowest layer of the cantilever truss (2). The outer end of the cantilever brace (3) is connected to the main steel structure (200) and is connected to the uppermost layer of the cantilever truss (2). The cantilever brace (3) connects all the cantilever trusses (2).

2. The ultra-large multi-layer cantilever steel structure according to claim 1, characterized in that: The main steel structure (200) includes columns (4), tie braces (5) and layered trusses (6). The columns (4) are vertically spaced on the lower structure. The layered trusses (6) are located between the columns (4). The top of the tie brace (5) is connected to the uppermost layered truss (6) and to the outer end of the cantilever brace (3). The bottom of the tie brace (5) is connected to the lowermost layered truss (6).

3. The ultra-large multi-layer cantilever steel structure according to claim 2, characterized in that: The cantilevered brace (3), the tie brace (5) and the lowest layer truss (6) are connected to each other to form a triangular frame, and the top of the triangular frame is connected to the uppermost layer truss (6).

4. The ultra-large multi-layer cantilever steel structure according to claim 2, characterized in that: The main steel structure (200) also includes reinforcing support columns (7), which are symmetrically arranged. The top of the reinforcing support columns (7) are respectively connected to the connection node between the cantilevered diagonal brace (3) and the layered truss (6) and the connection node between the tie diagonal brace (5) and the layered truss (6), and the bottom is connected to the connection node between the support column (4) and the layered truss (6).

5. The ultra-large multi-layer cantilever steel structure according to claim 1, characterized in that: The cantilever truss (2) is located on both sides of the cantilever column (1), and the cantilever trusses (2) located on both sides of the cantilever column (1) are perpendicular to each other.

6. The ultra-large multi-layer cantilever steel structure according to claim 1, characterized in that: The cantilever truss (2) is set in correspondence with the layered truss (6).

7. The ultra-large multi-layer cantilever steel structure according to claim 1, characterized in that: The cantilevered brace (3) includes a first support section (31) and a second support section (32). The first support section (31) is located in the cantilevered steel structure (100), and the second support section (32) is located in the main steel structure (200).

8. A super-large multi-layer cantilevered steel structure according to claim 1, characterized in that: The cantilevered mega-column (1) includes mega-column units, which are connected vertically to form the cantilevered mega-column (1), and the mega-column units are correspondingly arranged with the cantilevered truss (2).

9. A super-large multi-layer cantilevered steel structure according to claim 1, characterized in that: The cantilevered mega-column (1), cantilevered truss (2), cantilevered brace (3), tie brace (5) and layered truss (6) are all box-type steel structures.

10. A construction method for an ultra-large multi-story cantilevered steel structure according to claim 2, characterized in that, Includes the following steps, S1, component prefabrication: to prefabricate components into connecting node components and beam-column components; S2, Construction of main steel structure: First, the construction of the lower structure of the main steel structure (200) is carried out, and the construction of the upper structure is carried out after the construction is completed; When constructing the superstructure of the main steel structure (200), the structure is installed layer by layer from bottom to top. When installing the layers, the support column (4) and the layered truss (6) are installed first, and then the reinforcing support column (7), the tie brace (5), and the second support section (32) are installed. S3, Frame construction: Install the frame and use it as the installation foundation for the cantilevered mega-column (1); S4, Construction of the lower part of the cantilever steel structure: First, install the bottom column unit of the cantilever mega-column (1), install the bottom column unit on the jig, and then install the bottom layer of the cantilever truss (2). The bottom column unit is connected to the main steel structure (200) through the cantilever truss (2). Then, install layer by layer from bottom to top. When installing in layers, first install the mega-column unit and the cantilever truss (2), and then install the cantilever bracing (3). S5, dismantling of the formwork: After the construction of the two lower cantilever trusses (2) is completed, the cantilever mega-column (1) is connected to the main steel structure (200) through the cantilever trusses (2), and the formwork is dismantled; S6, Construction of the lower part of the cantilever steel structure: Layered installation is adopted. First, the mega-column unit is installed, and then the cantilever truss (2) is installed until the cantilever steel structure (100) is completed.

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