A complex structure system building and a three-dimensional construction method thereof

Abstract

The application discloses a complex structure system building and a three-dimensional construction method thereof, and the building is provided with a shuttle-shaped steel structure and a cantilever steel structure on the front and back sides; the building comprises a first building structure and a second building structure which are connected through a steel corridor; the first building structure and the second building structure are both Houzi-shaped core tube structures; the first building structure and the second building structure are provided with a first steel structure and a second steel structure respectively in the Houzi-shaped core tube structures; and the first building structure and the second building structure are both provided with a hanging truss on the side away from the steel corridor. The complex structure system building and the three-dimensional construction method thereof have the advantages that the building is beautiful, has high structural strength and high stability, different building function areas are constructed through different structure systems, and the building and the structure are perfectly combined. The three-dimensional construction method based on the stress characteristics of the structure system has the advantages of high practicability, less temporary support, short construction period and the like.

Description

Technical Field

[0001] This invention relates to the field of construction, and in particular to a complex structural system building and its three-dimensional construction method. Background Technology

[0002] As a green and energy-efficient building material, steel structures offer advantages such as facilitating industrialized and standardized production, shortening construction cycles, and effectively improving the efficiency of capital investment and the civility of construction sites. From a material performance perspective, steel structures are lightweight and compact, which helps improve the space utilization of buildings, and their high ductility results in excellent seismic performance. Given these numerous advantages, and to meet people's demands for architectural form, aesthetics, and visual impact, irregularly shaped buildings have emerged, incorporating innovative design concepts from architects.

[0003] Currently, large-scale industrial and public buildings such as large steel structure factories, airport terminals, convention centers, theaters, and stadiums are constantly emerging, such as Shanghai Pudong Airport, Guangzhou Gymnasium Main Hall, Guangzhou Convention and Exhibition Center, and the National Centre for the Performing Arts. These buildings provide strong technical support for the construction of large steel structures. However, steel structure buildings have drawbacks such as large steel consumption, poor fire resistance, and high cost. Therefore, there is a need for a steel-concrete composite building structure that combines the advantages of concrete and steel structures and is easy to construct. This is the goal pursued by existing projects. Summary of the Invention

[0004] To address the above problems, the purpose of this invention is to provide a complex structural system building and its three-dimensional construction method. The steel structure is rationally arranged in the building, has strong load-bearing capacity, and the construction method is simple and convenient.

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

[0006] A complex structural system building, comprising five floors above ground and one or two floors below ground; the building has a spindle-shaped steel structure and a cantilevered steel structure on its front and rear sides respectively; the building includes a first building structure and a second building structure connected by a steel corridor; both the first and second building structures are U-shaped core tube structures; the first and second steel structures are respectively installed inside the U-shaped core tube structures of the first and second building structures; and both the first and second building structures have suspended trusses on the side away from the steel corridor.

[0007] The first steel structure includes an orthogonal truss and a roof space frame; the orthogonal truss is hoisted from the ground to a pre-set corbel on the third-floor wall; the roof space frame is installed on the roof level; the second steel structure includes a cross-floor truss and a floor truss; the cross-floor truss is installed from the third floor to the roof level; the floor truss is installed on the third floor and the roof level; the cross-floor truss is close to the steel connecting corridor.

[0008] As a preferred implementation, the U-shaped core tube structure is a steel-concrete composite structure.

[0009] As a preferred embodiment, the building also includes a steel-structured observation platform installed on top of the second building structure.

[0010] As a preferred embodiment, diagonal bracing is provided between the suspended truss and both the first and second building structures.

[0011] As a preferred implementation scheme, both the first and second building structures have reserved access channels for hoisting equipment to enter the site.

[0012] A three-dimensional construction method for complex structural systems includes the following steps:

[0013] S1: Installation of the first column section and pouring of the roof slab in the basement;

[0014] S2: Installation of above-ground steel columns and the U-shaped core tube structure;

[0015] S3: Lifting of orthogonal trusses, multi-story trusses, and floor trusses;

[0016] S4: Installation of cantilevered steel structures and spindle-shaped steel structures;

[0017] S5: Installation of the hanging truss;

[0018] S6: Floor assembly and overall lifting of the roof space frame;

[0019] S7: Installation of the steel connecting corridor.

[0020] As a preferred implementation plan, after the overall lifting of the roof truss is completed, the post-pouring strip of the third floor of the first building structure is poured.

[0021] As a preferred implementation, step S7 is followed by the installation of a steel structure observation platform.

[0022] As a preferred implementation scheme, the reserved passage beams are installed after the first steel structure and the second steel structure are installed.

[0023] As a preferred implementation scheme, the building adopts a construction sequence of first the facade and then the plan; the facade construction adopts a semi-forward and semi-reverse construction method; the plan construction adopts a method of simultaneous construction of upper and lower floors and left and right sequential construction.

[0024] The beneficial effects of this invention are:

[0025] This invention provides a complex structural system building and its three-dimensional construction method. The building body is a steel-concrete composite structure, combining the advantages of both concrete and steel structures, resulting in high overall structural strength and stability. The building is divided into a first building structure and a second building structure by a steel corridor. The two building structures, based on their respective functional spaces, install different types of steel structures and are connected as a whole by the steel corridor. The overall structure is aesthetically pleasing and visually appealing. The front and rear sides of the building are respectively equipped with a spindle-shaped steel structure and a cantilevered steel structure. The spindle-shaped steel structure is used to construct the spindle-shaped corridor, providing excellent views; the cantilevered steel structure supports the installation of the curtain wall, ensuring the aesthetic appearance of the building's exterior surface. Suspended trusses installed on the sides of the first and second building structures are used to construct the high-ceilinged entrance hall, providing strong structural load-bearing capacity and high installation stability. In summary, the building of this invention is aesthetically pleasing, has varied shapes, high structural strength, and strong stability. Different structural systems are used to construct different functional areas, achieving a perfect integration of architecture and structure. The three-dimensional construction method based on the structural system's stress characteristics is highly practical, requires fewer temporary supports, and has a short construction period. Attached Figure Description

[0026] Figure 1 This is a plan view of the building structure of the present invention;

[0027] Figure 2 This is a front elevation view of the building structure of the present invention;

[0028] Figure 3 This is a flowchart of the construction method of the present invention;

[0029] Figure 4 This is a construction drawing of Embodiment 3 of the present invention.

[0030] In the diagram: 1. Cantilevered steel structure; 2. Spindle-shaped steel structure; 3. Steel connecting corridor; 4. First building structure; 5. Second building structure; 6. Suspended truss; 7. Roof space frame; 8. Orthogonal truss; 9. Multi-story truss; 10. Floor truss; 11. Steel structure observation platform. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings. In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0032] Example 1

[0033] like Figure 1-2 As shown, this embodiment provides a complex structural system building, the building having five floors above ground and one or two floors below ground; the front and rear sides of the building are respectively provided with a spindle-shaped steel structure 2 and a cantilevered steel structure 1; the building includes a first building structure 4 and a second building structure 5 connected by a steel corridor 3; both the first building structure 4 and the second building structure 5 are U-shaped core tube structures; the first steel structure and the second steel structure are respectively provided inside the U-shaped core tube structures of the first building structure 4 and the second building structure 5; the first building structure 4 and the second building structure 5 are far from the... One side of the steel connecting corridor 3 is equipped with a suspended truss 6. It is worth noting that the building's basement can be one or two stories, or partially two stories. The first building structure 4 and the second building structure 5 are connected as a whole by the steel connecting corridor 3. The first and second steel structures are installed using a U-shaped core tube structure as the installation foundation to ensure the overall structural strength. A shuttle-shaped steel structure 2 and a cantilevered steel structure 1 are respectively installed on the front and rear sides of the building. The shuttle-shaped steel structure 2 is used to construct the shuttle-shaped corridor, providing a good viewing experience; the cantilevered steel structure 1 is used to support the installation of the curtain wall, ensuring the aesthetic appearance of the building's exterior surface. The suspended trusses 6 installed on the sides of the first building structure 4 and the second building structure 5 are used to construct the high-ceilinged entrance hall, with strong structural load-bearing capacity and high installation stability. In summary, the building in this invention is aesthetically pleasing, has varied shapes, high structural strength, and strong stability. Different functional areas are constructed through different structural systems, achieving a perfect integration of architecture and structure. The three-dimensional construction method based on the structural system's stress characteristics is highly practical, requires fewer temporary supports, and has a short construction period.

[0034] The first steel structure includes an orthogonal truss 8 and a roof truss 7; the orthogonal truss 8 is hoisted from the ground to a pre-installed corbel on the third-floor wall; the roof truss 7 is installed on the roof level; the second steel structure includes a floor truss 9 and a floor truss 10; the floor truss 9 is installed from the third floor to the roof level; the floor truss 10 is installed on the third floor and the roof level; the floor truss 9 is located near the steel connecting corridor 3. It is worth noting that the U-shaped core tube structure in this application is a concrete structure, which, together with the first and second steel structures, constitutes a steel-concrete composite building. This avoids the disadvantages of traditional steel structure buildings, such as large steel consumption, poor waterproofing, and high cost, and combines the advantages of both concrete and steel structures. Furthermore, different functional spaces in this building structure are composed of different steel structures, resulting in a clear and distinct overall structural area. The concrete and steel structures work together perfectly, simplifying the building structure system and facilitating construction. It is worth noting that the installation of the interlayer truss 9 and the floor truss 10 in this application is specifically set according to the number of floors of the building. In actual production applications, those skilled in the art can make specific settings according to the actual situation. Schemes with different building floors but the same steel structure should fall within the protection scope of this scheme.

[0035] As a preferred implementation scheme, the U-shaped core tube structure is a steel-concrete composite structure. It is worth noting that the first to third floors of the first building structure 4 and the second building structure 5 are steel-concrete composite structures, including stiffening columns; the fourth floor to the roof floor are supported by the first steel structure and the second steel structure to ensure the stability of the upper structure installation.

[0036] As a preferred embodiment, the building also includes a steel structure observation platform 11 installed on top of the second building structure 5. The steel structure observation platform 11 is located on the top floor and has a wide field of vision.

[0037] As a preferred embodiment, diagonal bracing is provided between the suspended truss 6 and the first building structure 4 and the second building structure 5 to improve the stability of the inverted truss installation structure.

[0038] As a preferred implementation, both the first building structure 4 and the second building structure 5 have reserved access channels for hoisting equipment to enter the site. It is worth noting that the installation of the first and second steel structures inside the U-shaped core tube structure often employs a combination of tower cranes and truck cranes. Therefore, it is necessary to reserve access channels for truck cranes to enter the construction site. Furthermore, before the truck cranes enter the site, the load-bearing capacity of the access channels needs to be calculated, and reinforcement should be added directly to strengthen the channels and ensure their strength can support the weight of the truck cranes during operation.

[0039] Example 2

[0040] like Figure 1-3As shown, this embodiment is an expansion based on the above embodiments. Specifically, this embodiment provides a three-dimensional construction method for complex structural systems, including the following steps:

[0041] S1: Installation of the first column section and pouring of the roof slab in the basement;

[0042] S2: Installation of above-ground steel columns and the U-shaped core tube structure;

[0043] S3: Hoisting of orthogonal truss 8, inter-floor truss 9 and floor truss 10;

[0044] S4: Installation of cantilevered steel structure 1 and spindle-shaped steel structure 2;

[0045] S5: Installation of the hanging truss 6;

[0046] S6: Floor assembly and overall lifting of roof space frame 7;

[0047] S7: Installation of steel connecting corridor 3.

[0048] As a preferred implementation plan, after the overall lifting of the roof space frame 7 is completed, the post-cast strip of the third floor of the first building structure 4 is poured. Directly below the roof space frame 7 is the orthogonal truss 8. Design requirements dictate that after the orthogonal truss 8 is hoisted and concrete is poured, pre-loading is necessary before welding the supports and sealing the post-cast strip. The roof space frame 7 is assembled from three floors and then hoisted as a whole, using its own weight for pre-loading. After the overall lifting of the roof space frame 7 is completed, the post-cast strip of the third floor of the first building structure 4 is poured.

[0049] As a preferred implementation, step S7 is followed by the installation of the steel structure observation platform 11.

[0050] As a preferred implementation scheme, the reserved passage beams are installed after the first steel structure and the second steel structure are installed.

[0051] As a preferred implementation scheme, the building adopts a construction sequence of facade first, followed by plan view; the facade construction employs a semi-forward, semi-reverse construction method; the plan view construction employs simultaneous construction of upper and lower floors, and a left-right sequential construction method. It is worth noting that the building structure system in this application is complex, and traditional sequential construction methods are insufficient to meet the requirements of schedule, quality, and safety. Therefore, a three-dimensional construction method is adopted: concrete structure first, then steel structure; facade first, then plan view; simultaneous construction of upper and lower floors on the plan view; left-right sequential construction; and a semi-reverse construction method for the suspended truss 6 structure. In this application, construction is based on a spatial three-dimensional construction of the designed force system, with the first building structure 4 and the second building structure 5 constructed simultaneously, the large-span structure in the middle of the U-shaped core tube structure constructed as a single unit, and the suspended truss 6 constructed using a semi-forward, semi-reverse method.

[0052] Example 3

[0053] like Figure 1-4 As shown, this embodiment is an expansion based on the above embodiments. Specifically, this embodiment provides an engineering example of a complex structural system building and its three-dimensional construction method, as follows:

[0054] Located in the Chengdu Airport Industrial Service Zone, the project includes an international conference hall and a basement, with a total construction area of ​​approximately 190,512.46㎡ (87,516.99㎡ above ground and 102,995.47㎡ underground). The project has 5 floors above ground and 1 basement floor with a partial 2 basement floors, including underground parking, equipment rooms, and logistics service rooms. The project uses a combination of tower cranes and truck cranes for construction.

[0055] The first to third floors of this project are concrete structures, with the steel structure mainly consisting of stiffened columns. From the fourth floor to the roof, it is a steel frame structure composed of trusses, with truss spans ranging from 23m to 54m. The truss type is mainly planar trusses, and the members are mainly H-shaped and box-shaped components.

[0056] The building has a spindle-shaped steel structure 2 and a cantilevered steel structure 1 on its front and rear sides, respectively. The building includes a first building structure 4 and a second building structure 5 connected by a steel corridor 3. Both the first building structure 4 and the second building structure 5 are U-shaped core tube structures. The first steel structure and the second steel structure are respectively installed inside the U-shaped core tube structures of the first building structure 4 and the second building structure 5. Suspended trusses 6 are installed on the side of the first building structure 4 and the second building structure 5 away from the steel corridor 3. The first steel structure includes an orthogonal truss 8 and a roof space frame 7. The orthogonal truss 8 is hoisted from the ground to the pre-set corbels on the third-floor walls. The roof space frame 7 is installed on the roof layer. The area is 4374㎡, the thickness of the space frame is 2.6-4m, the grid size is 3.0m*3.0m, the top elevation is 24.2m, the upper chord of the space frame is connected by a crown ball, weighs about 800 tons, and adopts the construction process of integral lifting. The second steel structure includes a multi-level truss 9 and a floor truss 10. The multi-level truss 9 is installed from the third floor to the roof level; it is mainly distributed in a north-south direction, with a span ranging from 17m to 54m, and the heaviest single truss weighs approximately 380t. It is mainly composed of H-beams, with a maximum cross-section of H1200×800×80×80mm. The floor truss 10 is installed on the third floor and the roof level; its span ranges from 18.0m to 54.6m, with a cross-sectional height ranging from 2m to 5m. The heaviest single truss weighs approximately 68t, and it is mainly composed of H-beams, with a maximum cross-section of H600×500×30×50mm. The truss type is a planar truss. The multi-level truss 9 is located near the steel connecting corridor 3.

[0057] As a preferred embodiment, the building also includes a steel-structured observation platform 11 installed on top of the second building structure 5.

[0058] As a preferred implementation, in order to ensure the installation strength and stability of the suspended truss 6, diagonal bracing is provided between the suspended truss 6 and the first building structure 4 and the second building structure 5.

[0059] As a preferred implementation scheme, both the first building structure 4 and the second building structure 5 are provided with access channels for truck cranes to enter the site.

[0060] A three-dimensional construction method for complex structural systems is disclosed. The installation sequence includes both planar and elevation installation sequences. The planar construction sequence proceeds from the center outwards, while the elevation construction sequence proceeds layer by layer from bottom to top. In the steel frame structure, steel columns and beams are primarily hoisted using tower cranes, with truck cranes used to assist in installation in areas where tower cranes are not fully operational (truck cranes are also required for some steel columns and beams whose lifting weight exceeds the tower crane's lifting capacity). Floor trusses 10 are mainly assembled on the ground and then hoisted in sections using truck cranes. Multi-story trusses 9 are hoisted using a truck crane with temporary support frames for high-altitude assembly. The roof truss 7 is assembled across three floors and then lifted as a whole. Suspended trusses 6 are constructed from top to bottom, supported by suspended columns, avoiding the difficulties encountered in traditional construction methods where the lower support structure needs to pass through the already installed lower structure.

[0061] Specifically, the following steps are included:

[0062] S1: Installation of the first column section and pouring of the roof slab in the basement; installation of the basement;

[0063] S2: Installation of above-ground steel columns and the U-shaped core tube structure; reinforced concrete structure is used to ensure the overall strength and stability of the building; steel columns are installed along with the civil engineering work up to the third floor.

[0064] S3: Hoisting of orthogonal truss 8, interlayer truss 9 and floor truss 10; During the construction of orthogonal truss 8, interlayer truss 9 and floor truss 10, the steel beams in the corresponding areas are installed; and after the orthogonal truss 8, interlayer truss 9 and floor truss 10 are installed, the steel structure between the first building structure 4 and the second building structure 5 is also installed.

[0065] During the construction of the orthogonal truss 8, the orthogonal truss 8 consists of several sections. The two ends of the orthogonal truss 8 are set on pre-set brackets. The orthogonal truss 8 consists of two segmented trusses connected end to end. The truck crane lifts the first segmented truss on the underground roof slab and sets temporary supports in the middle of the truss span. Then the truck crane and tower crane lift the transverse secondary trusses. The truck crane lifts the second segmented truss to complete the lifting of one orthogonal truss 8, and then lifts the remaining orthogonal trusses 8 in sequence until the overall lifting is completed and the temporary supports are dismantled.

[0066] Before constructing the multi-story truss 9, a lifting weight analysis is required. The heaviest section of the multi-story truss 9 is analyzed for lifting weight. If it meets the lifting requirements, construction can proceed. The multi-story truss 9 includes a lower chord, lower web members, intermediate chords, upper web members, and a top chord. The process includes the following steps: a truck crane lifts the lower chord members of the multi-story truss 9 in sections; a truck crane lifts the lower web members of the multi-story truss 9; a truck crane lifts the intermediate chords of the multi-story truss 9; a truck crane lifts the upper web members of the multi-story truss 9; a truck crane lifts the top chords of the multi-story truss 9; and the entire multi-story truss 9 is then lifted and installed.

[0067] The interlayer truss 9 and the floor truss 10 are staggered vertically and connected to each other by hanging columns, pins and other means. During installation, not only vertical deformation will occur, but out-of-plane deformation control is also extremely important. When unloading, the stability of the truss itself and the surrounding structure must be taken into account.

[0068] S4: Installation of cantilevered steel structure 1 and spindle-shaped steel structure 2; also includes the installation of steel beams and steel columns corresponding to cantilevered steel structure 1 and spindle-shaped steel structure 2;

[0069] S5: Installation of the suspended truss 6; The suspended truss 6 includes the truss body and the floor truss. The two ends of the truss body are connected to the steel frames on both sides. The truss body is equipped with hanging columns at the bottom. The floor truss is connected to the hanging columns by pins. Floor slabs are laid on the floor truss. The suspended truss 6 forms a super high-ceilinged lobby. The suspended truss 6 is constructed from top to bottom, avoiding the need for the load-bearing structure below to pass through the completed steel structure due to traditional construction methods. This project simplifies the construction method and improves construction efficiency. In addition, diagonal bracing is set between the floor truss and the first building structure 4 and the second building structure 5 to improve the stability of the installation.

[0070] S6: Floor assembly and overall lifting of roof space frame 7; Roof space frame 7 is assembled on the three floors directly below, using a 12t truck crane. After assembly, it is lifted as a whole. The lifting area is approximately 4400㎡ (including roof purlins), with a lifting height of 10.2m. Twelve lifting points are arranged, with a maximum lifting reaction force of 771kN. Lifting frames are installed at the lifting points, utilizing the upper chord at the support as lifting beams. Horizontal tie rods are installed on the opposite side of the column top chord, connecting to the top or side of the concrete column. Diagonal braces and out-of-plane stabilizers are installed at the ends of the lifting beams.

[0071] After assembly, the entire space frame is lifted using a hydraulic system. After the first and second steel structures are installed, the pre-reserved passageway beams are installed. These beams reinforce the stability of the passageway structure, but their installation reduces the passageway height, affecting the normal entry and exit of the mobile crane from the building space. Therefore, the beam construction must be carried out after the mobile crane has exited the building space to ensure the project can proceed smoothly.

[0072] S7: Installation of steel connecting corridor 3; After the installation of steel connecting corridor 3 is completed, the steel structure observation platform 11 is installed, followed by the laying of floor slabs, and the overall building installation is completed.

[0073] As a preferred implementation plan, after the overall lifting of the roof space frame 7 is completed, the post-cast strip of the third floor of the first building structure 4 is poured. Directly below the roof space frame 7 is the orthogonal truss 8. Design requirements dictate that after the orthogonal truss 8 is hoisted and concrete is poured, pre-loading is necessary before welding the supports and sealing the post-cast strip. The roof space frame 7 is assembled from three floors and then hoisted as a whole, using its own weight for pre-loading. After the overall lifting of the roof space frame 7 is completed, the post-cast strip of the third floor of the first building structure 4 is poured.

[0074] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A complex structural system building, characterized in that: The building has five floors above ground and one or two floors below ground; the front and rear sides of the building are respectively provided with a spindle-shaped steel structure and a cantilevered steel structure; the building includes a first building structure and a second building structure connected by a steel corridor; both the first building structure and the second building structure are U-shaped core tube structures; the U-shaped core tube structures of the first building structure and the second building structure are respectively provided with a first steel structure and a second steel structure; both the first building structure and the second building structure are provided with a hanging truss on the side away from the steel corridor. The first steel structure includes an orthogonal truss and a roof space frame; the orthogonal truss is hoisted from the ground to a pre-set corbel on the third-floor wall; the roof space frame is installed on the roof level; the second steel structure includes a cross-floor truss and a floor truss; the cross-floor truss is installed from the third floor to the roof level; the floor truss is installed on the third floor and the roof level; the cross-floor truss is close to the steel connecting corridor.

2. A complex structural system building according to claim 1, characterized in that: The U-shaped core tube structure is a steel-concrete composite structure.

3. A complex structural system building according to claim 1, characterized in that: The building also includes a steel-structured flight observation platform installed on top of the second building structure.

4. A complex structural system building according to claim 1, characterized in that: The suspended truss is provided with diagonal bracing between itself and the first and second building structures.

5. A complex structural system building according to claim 1, characterized in that: Both the first and second building structures have reserved access channels for hoisting equipment to enter the site.

6. A three-dimensional construction method for a complex structural system building according to any one of claims 1-5, characterized in that: Includes the following steps: S1: Installation of the first column section and pouring of the roof slab in the basement; S2: Installation of above-ground steel columns and the U-shaped core tube structure; S3: Lifting of orthogonal trusses, multi-story trusses, and floor trusses; S4: Installation of cantilevered steel structures and spindle-shaped steel structures; S5: Installation of the hanging truss; S6: Floor assembly and overall lifting of the roof space frame; S7: Installation of the steel connecting corridor.

7. The three-dimensional construction method for a complex structural system building according to claim 6, characterized in that: After the overall lifting of the roof truss is completed, the post-cast strip of the third floor of the first building structure is poured.

8. The three-dimensional construction method for a complex structural system building according to claim 6, characterized in that: Step S7 is followed by the installation of a steel structure observation platform.

9. A three-dimensional construction method for a complex structural system building according to claim 6, characterized in that: After the first and second steel structures are installed, the reserved passage beams are installed.

10. A three-dimensional construction method for a complex structural system building according to claim 6, characterized in that: The building adopts a construction sequence of first the facade and then the plan; the facade construction adopts a semi-forward and semi-reverse construction method; the plan construction adopts a method of simultaneous construction of upper and lower floors and left and right sequential construction.

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