A building large corner high-altitude long overhanging cast-in-situ structure support system and construction method

Abstract

The application relates to a building large-corner high-altitude long-cantilever cast-in-place structure support system and a building method, and belongs to the technical field of building construction. The application comprises a first cantilever support body and a second cantilever support body. The first cantilever support body is formed by a post-anchored component, the second cantilever support body is formed by a pre-buried component, the first cantilever support body is arranged at a corner position of a large corner of a building body, the second cantilever support body is arranged at a straight segment position on both sides of the corner, the first cantilever support body and the second cantilever support body have a height difference in the radial direction, and a stand column is connected between the two at a beam intersection position to form a three-dimensional truss support structure. The building large-corner high-altitude long-cantilever cast-in-place structure support system creatively combines post-anchored and pre-buried bolt type steel cantilever technology to form a composite cantilever support system, is specially designed for high-altitude long-cantilever cast-in-place structures at large-span and large-corner positions, and has high structural stability and bearing capacity.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to a support system and construction method for a high-altitude long cantilever cast-in-place structure with large corners in a building. Background Technology

[0002] With the progress of the times, people have higher requirements for the appearance and shape of buildings. Especially for public buildings and landmark buildings, the shape is often unconventional. In order to meet the appearance requirements of the building design, it has become common for the high-rise structure to be cantilevered as a whole, with no structural components under the projected area of ​​the cantilevered structure. This poses a great challenge to construction.

[0003] Faced with such situations, the traditional approach is to use ground-mounted formwork support scaffolds. This method is only suitable for low-rise cantilevered floors. For higher floors, on-site erection is not feasible, and high-rise formwork poses significant safety risks, as the scaffold is prone to instability. If steel cantilever structures are used, existing types include rear-anchored and pre-embedded bolted steel cantilever structures. Due to the length of the cantilever structure, both require lower supports. If rear-anchored steel cantilever structures are used alone, the presence of structural columns and shear walls at building corners leads to excessive penetration of the shear walls by the cantilevered steel sections, resulting in excessive breakage of the vertical reinforcement and affecting structural stress. Furthermore, the presence of too many rear-anchored steel beams at corners makes arrangement difficult. If pre-embedded bolted steel cantilever structures are used alone, multiple cantilevered steel beams are required at corners, easily leading to excessive stress concentration. The load is transferred through the scaffolding uprights to the cantilevered I-beams, and then through the bolt group to the main structure. Stress concentration is prone to occur at the bolt root (the surface in contact with concrete) and the bolt itself (especially at the threads), particularly near the cantilever end where the stress is greatest. Improper design or construction can lead to bolt deformation, breakage, or localized crushing of the concrete. Therefore, a new support system and construction method for high-altitude, long-cantilever cast-in-place structures with large corners is needed to address the problems of high construction difficulty and low safety of existing high-altitude cantilever structure formwork support systems. Summary of the Invention

[0004] The purpose of this invention is to provide a support system and construction method for a high-altitude long cantilever cast-in-place structure with large building corners, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-altitude long cantilever cast-in-place structural support system for a building with a large corner, comprising a first cantilever support body and a second cantilever support body. The first cantilever support body is constructed using rear-anchored components, and the second cantilever support body is constructed using pre-embedded components. The first cantilever support body is located at the corner of the building's large corner, and the second cantilever support body is located on both sides of the straight section of the building's large corner. The first and second cantilever support bodies have a height difference in the radial direction, and a column is connected between them at the intersection of the connecting beams to form a three-dimensional truss support structure.

[0006] Preferably, both the main beam components of the first and second cantilever supports are provided with lower supports.

[0007] As a preferred option, the lower support uses I-beams as components; when the lower support is in use, if the lower support position is located on the lower edge beam of the main beam component, the lower support position is installed on the lower edge beam using angle steel embedded parts; if the lower support position is located on the building structural column or shear wall, the lower support position is installed on the building structural column or shear wall using flat plate embedded parts.

[0008] Preferably, the angle steel embedded part includes angle steel and anchoring steel bars; anchoring steel bars are fixedly installed on the inner sides of the two right-angled sides of the angle steel, and the outer sides of the two right-angled sides of the angle steel form the lower support connection end; the flat plate embedded part includes a flat plate, an I-beam shear member and anchoring steel bars; the flat plate is a steel plate structure, the I-beam shear member and anchoring steel bars are fixedly installed on one side of the flat plate to form the anchoring end, and the other side of the flat plate forms the lower support connection end.

[0009] Preferably, the components of the first and second cantilever supports are made of steel sections as cantilever beams. The components of the first cantilever support are installed on the floor slab of the building, and the components of the second cantilever support are installed in the upper middle part of the structural beam of the building.

[0010] Preferably, the cantilevered main beams of the first cantilever support are spaced apart along the direction perpendicular to the building floor slab; the cantilevered main beams of the second cantilever support are spaced apart in a fan shape along the corner of the building; the first and second cantilever supports are fixedly connected to columns at intervals along the connecting beams at the intersection of the connecting beams; steel connecting beams are installed on the upper side of the cantilevered main beams of the first and second cantilever supports as the installation end of the scaffolding uprights to form a scaffolding working platform.

[0011] As a preferred embodiment, the cantilever main beam of the first cantilever support is anchored to the floor slab of the building using U-shaped anchor rings, and the gap between the U-shaped anchor rings and the cantilever main beam is tightened by wedge blocks; the cantilever main beam of the second cantilever support is fixed to the structural beam of the building using through-wall bolts, and when the cantilever main beam encounters a frame column, steel beam, steel bracket or a location where through-wall bolts cannot be installed, it is fixed to the building using semi-embedded bolts.

[0012] On the other hand, the present invention also provides a method for constructing a support system for a high-altitude long cantilever cast-in-place structure with large corners, comprising the following steps: S1. Use architectural modeling software to generate the position coordinates of the lower support embedded parts: Based on the construction drawings, use architectural modeling software to model and analyze the area to be constructed, and automatically export the three-dimensional coordinates of the lower support embedded parts to adjust the position of the lower support embedded parts and avoid the lower support steel beams from colliding with each other; the lower support embedded parts need to be staggered from the curtain wall embedded parts of the building when they are embedded. S2. During the construction of the building structure, the pre-embedded parts are installed: During the construction of the lower support layer building structure, the pre-embedded parts of the lower support I-beams are installed according to the three-dimensional coordinates of the lower support pre-embedded parts in S1; During the construction of the cantilever support layer building structure, the U-shaped anchor rings of the cantilever main beam of the first cantilever support body and the pre-embedded bolts of the cantilever main beam of the second cantilever support body are installed. S3. Ground-assembled cantilever main beam unit: The cantilever main beam of the first or second cantilever support body and the lower support I-beam are laid out and welded together on the ground at a 1:1 scale to form a cantilever main beam unit; the cantilever main beam in the cantilever main beam unit is welded with lifting lugs, and the welding position of the lifting lugs is calculated by architectural modeling software so that the center of gravity of the cantilever main beam unit is consistent with the position of the lifting rope during on-site hoisting; S4. Hoisting of the cantilever main beam units: According to the building construction drawings, the cantilever units are hoisted and positioned in sequence, and the cantilever main beams and lower support I-beams are fixedly connected to the building; after the hoisting and fixing of all cantilever main beam units are completed, columns are welded between the cantilever main beams of the first and second cantilever supports to form a three-dimensional truss structure. S5. Weld steel connecting beams, erect scaffolding on the steel connecting beams, and set up two layers of protection on the steel connecting beams and the support layer of the lower supporting I-beams: According to the construction drawings, weld steel connecting beams on the cantilever main beams at positions corresponding to the scaffolding uprights to form a cantilever platform; anti-slip reinforcement bars are welded on the steel connecting beams; install scaffolding uprights on the steel connecting beams and erect scaffolding; set up steel pipes parallel to the steel connecting beams at intervals on the cantilever platform, and lay wooden squares on the steel pipes to form the first layer of protection; at the same time, set up horizontal protection on the support layer of the lower supporting I-beams below the cantilever platform to form the second layer of protection. S6. Erect the formwork support system and carry out subsequent building construction work: The formwork support system is constructed according to the construction plan, and the edge protection is completed by the external protective scaffolding; the external protective scaffolding is disconnected from the formwork support system. During the cantilever structure, the outer scaffolding is only used as a working platform, and it will be converted into the outer scaffolding after the construction is completed. S7. Cantilever Platform Dismantling After Construction: When dismantling the cantilever platform, first unload the platform load before dismantling. Before dismantling, use hoisting equipment to secure the lifting lugs of the cantilever main beam with slings. Then cut the lower support I-beam and dismantle the connection point between the cantilever main beam and the building. After complete removal and loosening, use traction equipment to drag the cantilever main beam to the floor before cutting it and then hoisting it to the ground in sections. Workers performing cutting operations at height must wear safety belts, and guardrails that meet the specifications must be installed at the edges.

[0013] As a preferred option, in S2, during the construction of the lower support layer building structure, the embedded parts of the lower support are selected according to the support position of the lower support I-beam: when the lower support is located on the lower edge beam of the main beam component, the lower support embedded parts are angle steel embedded parts; when the lower support is located on the building structure column or shear wall, the lower support embedded parts are flat plate embedded parts; the cross-sectional dimension error of the embedded parts should be less than 2mm, and the surface flatness should be less than 2mm during installation. During the construction of the cantilevered support structure, the U-shaped anchor rings are formed by cold bending U-shaped steel bar rings. Two U-shaped anchor rings are installed at the tail end of the cantilevered main beam of the building floor structure, with a spacing of 150mm-200mm between the two U-shaped anchor rings. The head end of the cantilevered main beam is anchored to the side beam of the building, less than 100mm from the side of the beam. When pre-embedding the U-shaped anchor rings, the U-shaped anchor rings extend into the steel mesh of the building structure and are fixed to the steel mesh by binding steel bars. The pre-embedded parts of all cantilevered main beams are set at the same height.

[0014] As a preferred embodiment, in S5, when steel pipes are installed parallel to the steel beams on the cantilever platform, the spacing between the steel pipes is no more than 300mm. After laying timber on the steel pipes, double-layer formwork is fully laid to form the first layer of protection. The horizontal protection includes steel wire ropes, double-layer safety nets, and support rods. The support rods are installed in an outward-sloping manner on the support layer, with a horizontal angle of no less than 45°, and are installed parallel at intervals. The top of the support rods is fixed to the building structure where the cantilever platform is located by steel wire ropes. The double-layer safety net is laid between two adjacent support rods, which includes an upper layer of dense mesh netting and a lower layer of safety netting.

[0015] Beneficial effects: 1. The building corner high-altitude long cantilever cast-in-place structure support system of the present invention efficiently solves the construction problems of high-altitude cantilever structures with large corners: It creatively combines post-anchored and pre-embedded bolt steel cantilever technology to form a composite cantilever support system, specifically designed for high-altitude long cantilever cast-in-place structures with large spans and large corners. This system not only effectively provides a reliable formwork support foundation, but also integrates safety protection functions, successfully solving the core technical problems of high-altitude work platform erection and structural construction in such complex locations.

[0016] 2. Building upon the foregoing, the structural support system for high-altitude, long-cantilevered cast-in-place structures at large corners of buildings in this invention cleverly connects the rear-anchored and pre-embedded bolted cantilevered main beams at different elevations into a stable three-dimensional truss structure by adding steel columns at the intersection of connecting beams. This design significantly enhances the overall rigidity, efficiently disperses the complex concentrated stress at the corners, and greatly improves the load-bearing capacity and deformation resistance of the cantilever system. This results in the structural stability and load-bearing capacity of the structural support system for high-altitude, long-cantilevered cast-in-place structures at large corners of buildings in this invention.

[0017] 3. Based on the foregoing, the building corner high-altitude long cantilever cast-in-place structure support system of the present invention innovatively uses angle steel embedded parts to connect the lower edge beams, or uses flat embedded parts with I-beam shear members to anchor to the wall column or shear wall. Both methods can effectively eliminate the risk of diagonal bracing slippage of the lower support and greatly improve the shear resistance of the support nodes, ensuring the stability and reliability of the support system.

[0018] 4. The construction method of the high-altitude long cantilever cast-in-place structure support system at the building corner of the present invention addresses the problem of complex and easily collided lower support steel beams at the building corner. It applies architectural modeling software technology for precise modeling and collision analysis, automatically exports the three-dimensional coordinates of the embedded parts to guide construction, ensures the accurate position of the embedded parts, effectively avoids conflicts in the installation of steel beams, and achieves refined design and construction guarantee.

[0019] 5. Building upon the foregoing, the construction method of the high-altitude long cantilever cast-in-place structural support system for large building corners of the present invention adopts an innovative ground-assembly cantilever main beam unit process. This involves welding the cantilever main beam and its underlying support as a single unit on the ground, and then using lifting lugs to hoist it by calculating the center of gravity. This minimizes the amount of dangerous high-altitude welding work, reduces safety risks, and improves construction safety and convenience.

[0020] 6. Based on the foregoing, the construction method of the high-altitude long cantilever cast-in-place structure support system for large corners of buildings of the present invention improves construction safety by welding steel connecting beams onto the cantilever main beams, erecting scaffolding on the steel connecting beams, and setting two layers of protection on the steel connecting beams and the supporting layer supporting the I-beams below, forming a multi-layered safety protection system. Specifically, a double-layered horizontal safety net is erected below the cantilever platform, with support rods and inclined steel wire ropes to form a robust fall protection layer. Above the cantilever platform, densely packed steel pipes, timber, and double-layered formwork are laid along the steel connecting beams, forming two rigid protective layers, providing comprehensive and multi-layered safety protection for workers and effectively preventing falling objects and personnel accidents.

[0021] 7. Based on the foregoing, the building corner high-altitude long cantilever cast-in-place structure support system of the present invention can flexibly select or combine post-anchor type and pre-embedded bolt type cantilever methods according to the straight section and different structural characteristics and stress requirements of the corner of the building, including through-wall bolts or semi-pre-embedded bolts, and can provide targeted and reliable anchoring solutions in key parts such as columns and shear walls, with strong adaptability.

[0022] 8. Based on the above, the building corner high-altitude long cantilever cast-in-place structure support system of the present invention provides a solid platform for the erection of formwork support frame and concrete pouring of high-altitude cantilever structures under the premise of safety and reliability, ensuring the smooth progress of subsequent construction operations, helping to shorten the construction period, improve construction efficiency, and ensure the forming quality of cantilever structures. Attached Figure Description

[0023] Figure 1 Structural plan view of the support system for the high-altitude long cantilever cast-in-place structure at a large corner of the building, as shown in the embodiment; Figure 2 Structural elevation view of the support system for the high-altitude long cantilever cast-in-place structure at a large corner of a building, as shown in the embodiment; Figure 3 The structural cross-sectional view of the support system and formwork support system for the high-altitude long cantilever cast-in-place structure at a large corner of the building, as shown in the embodiment; Figure 4 This is a structural diagram of the cantilever main beam unit of the second cantilever support body of the high-altitude long cantilever cast-in-place structure support system at a large building corner, as an example (the lower support embedded part is an angle steel embedded part). Figure 5 This is a structural diagram of the cantilever main beam unit of the first cantilever support body of the building large corner high-altitude long cantilever cast-in-place structure support system in the embodiment (the lower support embedded part is an angle steel embedded part). Figure 6 This is a schematic diagram of the installation structure of the flat plate embedded part of the support system for the high-altitude long cantilever cast-in-place structure with a large corner of the building, as an example. Figure 7 This is a schematic diagram of the angle steel plate embedded part of the support system for a high-altitude long cantilever cast-in-place structure with a large corner in an example building.

[0024] In the diagram: 1. Embedded component; 2. Post-anchored component; 3. Structural column or shear wall; 4. Edge beam; 5. Flat plate; 6. Cantilever main beam; 7. Lower support; 8. Embedded bolt; 9. Angle steel; 10. Anchoring reinforcement; 11. I-beam shear member; 12. Column; 13. Steel connecting beam; 14. Anti-slip reinforcement; 15. U-shaped anchor ring; 16. Formwork support system; 17. Steel wire rope; 18. Double-layer safety net; 19. Support rod; 20. External protective scaffolding; 21. Lifting lug; 22. Embedded part of lower support. Detailed Implementation

[0025] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the embodiments.

[0026] Please see Figures 1-7 This embodiment provides a high-altitude long cantilever cast-in-place structural support system for a building with a large corner, including a first cantilever support and a second cantilever support. The first cantilever support is constructed using a rear-anchored component 2, and the second cantilever support is constructed using a pre-embedded component 1. The first cantilever support is located at the corner of the building's large corner, and the second cantilever support is located on both sides of the straight section of the building's large corner. The components of the first and second cantilever supports are constructed using steel sections as cantilever main beams 6. The components of the first cantilever support are installed on the floor slab of the building, and the components of the second cantilever support are installed in the upper middle part of the structural beams of the building. A steel column 12 is connected between the two at the intersection of the connecting beams to form a three-dimensional truss support structure.

[0027] In this embodiment, both the first and second cantilever supports are provided with lower supports 7 on the underside of the main beam components. The lower supports are constructed using I-beams. When the lower support is in operation, if its position is located on the lower edge beam 4 of the main beam component, the lower support is installed on the lower edge beam using an angle steel embedded part; if its position is located on a structural column or shear wall 3, the lower support is installed on the structural column or shear wall using a flat plate embedded part.

[0028] Furthermore, the angle steel embedded part in this embodiment includes angle steel 9 and anchoring steel bars 10; anchoring steel bars are fixedly installed on the inner sides of the two right-angled sides of the angle steel, and the outer sides of the two right-angled sides of the angle steel constitute the lower support connection end; the flat plate embedded part includes flat plate 5, I-beam shear member 11 and anchoring steel bars 10; the flat plate is a steel plate structure, the I-beam shear member and anchoring steel bars are fixedly installed on one side of the flat plate to form the anchoring end, and the other side of the flat plate constitutes the lower support connection end.

[0029] In this embodiment, the cantilevered main beams of the first cantilever support are distributed at intervals along the direction perpendicular to the building floor slab; the cantilevered main beams of the second cantilever support are distributed at fan-shaped intervals along the corners of the building; steel columns are fixedly connected to the first and second cantilever supports at intervals along the connecting beams at the intersection of the connecting beams; steel connecting beams 13 are installed on the upper side of the cantilevered main beams of the first and second cantilever supports as the installation end of the scaffolding uprights to form a scaffolding working platform.

[0030] Furthermore, in this embodiment, the cantilever main beam of the first cantilever support is anchored to the floor slab of the building using U-shaped anchor rings 15, and the gap between the U-shaped anchor rings and the cantilever main beam is tightened by wedge blocks; the cantilever main beam of the second cantilever support is fixedly installed to the structural beam of the building using through-wall bolts 8, and when the cantilever main beam encounters a frame column, steel beam, steel bracket or a location where through-wall bolts cannot be installed, it is fixedly installed using semi-embedded bolts.

[0031] In addition, this embodiment also provides a construction method for a high-altitude long cantilever cast-in-place structure support system with large building corners, including the following steps: S1. Use BIM modeling technology to generate the position coordinates of the lower support embedded parts: According to the construction drawings, use architectural modeling software to model and analyze the key areas to be constructed, and automatically export the three-dimensional coordinates of the lower support embedded parts to adjust the position of the lower support embedded parts and avoid the lower support steel beams from colliding with each other; when the lower support embedded parts 22 are embedded, they should be staggered with the curtain wall embedded parts of the building to prevent collisions. S2. During the construction of the building structure, the pre-embedded parts shall be installed: During the construction of the lower support layer, the pre-embedded parts of the lower support I-beam shall be installed according to the three-dimensional coordinates of the lower support pre-embedded parts in S1. Specifically, the pre-embedded parts of the lower support shall be selected according to the support position of the lower support I-beam: when the lower support is located on the lower edge beam of the main beam component, the lower support pre-embedded parts shall be angle steel pre-embedded parts; when the lower support is located on the building structure column or shear wall, the lower support pre-embedded parts shall be flat plate pre-embedded parts; the cross-sectional dimension error of the pre-embedded parts shall be less than 2mm, and the flatness of the surface during installation shall be less than 2mm. During the construction of the cantilevered support layer structure, the pre-embedding work of U-shaped anchor rings for the cantilevered main beam of the first cantilevered support and the pre-embedding work of bolts for the cantilevered main beam of the second cantilevered support are carried out. Specifically, the U-shaped anchor rings are formed by cold bending U-shaped steel bar pull rings. Two U-shaped anchor rings are set at the tail end of the cantilevered main beam of the first cantilevered support, which is anchored to the floor structure of the building. The spacing between the two U-shaped anchor rings is 150mm-200mm, while the head end is anchored to the side beam of the building, less than 100mm from the side of the beam. When pre-embedding the U-shaped anchor rings, the U-shaped anchor rings extend into the steel mesh of the building structure and are fixed to the steel mesh by two 1.5-meter-long HRB400φ20 binding steel bars. Before the concrete pouring of the cantilever layer, the position of the pre-embedded parts should be checked against the steel layout drawing. The pre-embedded parts of all cantilevered main beams should be set at the same height as much as possible.

[0032] S3. Ground-assembled cantilever main beam unit: The cantilever main beam of the first or second cantilever support body and the lower support I-beam are laid out and welded together on the ground at a 1:1 scale to form a cantilever main beam unit; the cantilever main beam in the cantilever main beam unit is welded with lifting lugs 21. The welding position of the lifting lugs is calculated by architectural modeling software so that the center of gravity of the cantilever main beam unit is consistent with the position of the lifting rope during on-site hoisting; S4. Hoisting of the cantilever main beam units: According to the building construction drawings, the cantilever units are hoisted and positioned sequentially, and the cantilever main beams and lower support I-beams are fixedly connected to the embedded parts in S2. After all cantilever main beam units are hoisted and fixed, steel columns are welded between the cantilever main beams of the first and second cantilever supports to form a three-dimensional truss structure. In this embodiment, when fixing the cantilever units to the embedded parts, the cantilever main beam of the first cantilever support is anchored to the embedded U-shaped anchor rings. After anchoring, the gap between the U-shaped anchor rings and the main beam steel is tightened with steel wedges or hardwood wedges. The cantilever main beam of the second cantilever support is connected to the embedded bolts. The lower support I-beams are welded to the embedded angle steel or flat plate.

[0033] S5. Weld the steel connecting beams, erect scaffolding on the steel connecting beams, and set up two layers of protection on the steel connecting beams and the supporting layer supporting the I-beams below: According to the construction drawings, weld the steel connecting beams at the corresponding positions of the scaffolding uprights on the cantilevered main beams to form a cantilevered platform; anti-slip steel bars 14 are welded on the steel connecting beams; install scaffolding uprights on the steel connecting beams and erect scaffolding; set steel pipes parallel to the steel connecting beams at intervals along the cantilevered platform, with a spacing of no more than 300mm between the steel pipes, and after laying timber on the steel pipes, fully lay double-layer formwork to form the first layer of protection; at the same time A horizontal protective layer is installed on the support layer of the lower supporting I-beam below the cantilever platform to form a second layer of protection. The horizontal protection in this embodiment includes a steel wire rope 17, a double-layer safety net 18, and a support rod 19. The support rod is installed on the support layer with an outward tilt, and the horizontal angle of the support rod is not less than 45°. The support rods are installed in parallel at intervals. The top of the support rod is fixed to the building where the cantilever platform is located by a steel wire rope. The double-layer safety net is laid between two adjacent support rods, which includes an upper layer of ordinary dense mesh net and a lower layer of nylon flat safety net.

[0034] S6. Erect the formwork support system and carry out subsequent building construction work: The formwork support system 16 is constructed according to the construction plan, and the edge protection is completed by the external protective scaffolding 20; the external protective scaffolding is disconnected from the formwork support system. During the cantilever structure, the outer scaffolding is only used as a working platform, and it will be converted into an outer scaffolding after the construction is completed. S7. Cantilever Platform Dismantling After Construction: When dismantling the cantilever platform, first unload the platform load before dismantling. Before dismantling, use tower crane slings to secure the cantilever main beam to the lifting lugs. Then cut the lower support I-beams and dismantle the connection point between the cantilever main beam and the building. After complete removal and loosening, the cantilever main beam is first dragged to the floor using traction equipment before cutting and then hoisted to the ground in sections. Personnel working at height during cutting operations must wear safety belts, and guardrails that meet the specifications must be installed at the edges.

[0035] Working Principle: The high-altitude long cantilever cast-in-place structure support system at large corners in this embodiment creatively combines post-anchored and pre-embedded bolt steel cantilever technology to form a composite cantilever support system, specifically designed for high-altitude long cantilever cast-in-place structures with large spans and large corners. This system not only effectively provides a reliable formwork support foundation but also integrates safety protection functions, successfully solving the core technical challenges of high-altitude work platform erection and structural construction in such complex locations. The construction method of the high-altitude long cantilever cast-in-place structure support system at large corners in this embodiment addresses the problem of complex and easily collided lower support steel beams at building corners. It applies architectural modeling software technology for precise modeling and collision analysis, automatically exporting the three-dimensional coordinates of embedded parts to guide construction, ensuring accurate positioning of embedded parts, effectively avoiding steel beam installation conflicts, and achieving refined design and construction assurance. An innovative ground-assembly cantilever main beam unit process is adopted, where the cantilever main beam and its lower support are welded as a whole unit on the ground, and then lifting lugs are set according to the calculated center of gravity position for hoisting. This system minimizes the amount of dangerous high-altitude welding work, reduces safety risks, and improves construction safety and convenience. By welding steel beams onto the cantilevered main beam, erecting scaffolding on these beams, and implementing two layers of protection—one on the steel beams and the other on the supporting layers of the underlying I-beams—a multi-layered safety system is formed, enhancing construction safety. Specifically, a double-layered horizontal safety net is erected below the cantilevered platform, with support rods and diagonal steel cables forming a robust fall protection layer. Above the cantilevered platform, densely packed steel pipes, timber, and double-layered formwork are laid along the steel beams, creating two rigid protective layers. This provides comprehensive, multi-layered safety protection for workers, effectively preventing falling objects and personnel accidents. This embodiment of the building's large-angle, high-altitude, long-cantilever cast-in-place structure support system provides a solid platform for the erection of formwork support frames and concrete pouring of the high-altitude cantilever structure, ensuring the smooth progress of subsequent construction operations, helping to shorten the construction period, improve construction efficiency, and ensure the quality of the cantilever structure's formation.

[0036] As described above, although the invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A support system for a high-altitude, long-cantilever cast-in-place structure with a large corner in a building, comprising a first cantilever support body and a second cantilever support body, characterized in that: The first cantilever support is constructed using rear-anchored components, and the second cantilever support is constructed using pre-embedded components. The first cantilever support is located at the corner of the building's major corner, and the second cantilever support is located on the straight sections on both sides of the building's major corner. The first and second cantilever supports have a radial height difference, and they are connected by columns at the intersection of the connecting beams to form a three-dimensional truss support structure.

2. The support system for a high-altitude, long-cantilevered cast-in-place structure with a large corner as described in claim 1, characterized in that, Both the first and second cantilever supports have lower supports installed on the underside of the main beam components.

3. The support system for a high-altitude, long-cantilevered cast-in-place structure with a large corner as described in claim 2, characterized in that, The lower support uses I-beams as components; when the lower support is in operation, if the lower support position is located on the lower edge beam of the main beam component, the lower support position is installed on the lower edge beam using angle steel embedded parts; if the lower support position is located on the building structural column or shear wall, the lower support position is installed on the building structural column or shear wall using flat plate embedded parts.

4. The support system for a high-altitude, long-cantilevered cast-in-place structure with a large corner as described in claim 3, characterized in that, The angle steel embedded part includes angle steel and anchoring steel bars; anchoring steel bars are fixedly installed on the inner sides of the two right-angled sides of the angle steel, and the outer sides of the two right-angled sides of the angle steel form the lower support connection end; the flat plate embedded part includes a flat plate, an I-beam shear member and anchoring steel bars; the flat plate is a steel plate structure, the I-beam shear member and anchoring steel bars are fixedly installed on one side of the flat plate to form the anchoring end, and the other side of the flat plate forms the lower support connection end.

5. The support system for a high-altitude, long-cantilevered cast-in-place structure with a large corner as described in claim 2, characterized in that, The components of the first and second cantilever supports are made of steel sections as cantilever beams. The components of the first cantilever support are installed on the floor slab of the building, and the components of the second cantilever support are installed in the upper middle part of the structural beam of the building.

6. The support system for a high-altitude, long-cantilevered cast-in-place structure with a large corner as described in claim 5, characterized in that, The cantilevered main beams of the first cantilevered support are distributed at intervals along the direction perpendicular to the building floor slab; the cantilevered main beams of the second cantilevered support are distributed at fan-shaped intervals along the corners of the building; the first and second cantilevered supports are fixedly connected to columns at intervals along the connecting beams at the intersection of the connecting beams; steel connecting beams are installed on the upper side of the cantilevered main beams of the first and second cantilevered supports as the installation end of the scaffolding uprights to form a scaffolding working platform.

7. A support system for a high-altitude, long-cantilevered cast-in-place structure with a large corner as described in claim 5, characterized in that, The cantilever main beam of the first cantilever support is anchored to the floor slab of the building using U-shaped anchor rings, and the gap between the U-shaped anchor rings and the cantilever main beam is tightened by wedge blocks; the cantilever main beam of the second cantilever support is fixed to the structural beam of the building using through-wall bolts, and when the cantilever main beam encounters a frame column, steel beam, steel bracket or a location where through-wall bolts cannot be installed, it is fixed using semi-embedded bolts.

8. A construction method for a high-altitude, long-cantilever cast-in-place structural support system for a building with large corners, as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Use architectural modeling software to generate the position coordinates of the lower support embedded parts: Based on the construction drawings, use architectural modeling software to model and analyze the area to be constructed, and automatically export the three-dimensional coordinates of the lower support embedded parts to adjust the position of the lower support embedded parts and avoid the lower support steel beams from colliding with each other; the lower support embedded parts need to be staggered from the curtain wall embedded parts of the building when they are embedded. S2. During the construction of the building structure, the pre-embedded parts are installed: During the construction of the lower support layer building structure, the pre-embedded parts of the lower support I-beams are installed according to the three-dimensional coordinates of the lower support pre-embedded parts in S1; During the construction of the cantilever support layer building structure, the U-shaped anchor rings of the cantilever main beam of the first cantilever support body and the pre-embedded bolts of the cantilever main beam of the second cantilever support body are installed. S3. Ground-assembled cantilever main beam unit: The cantilever main beam of the first or second cantilever support body and the lower support I-beam are laid out and welded together on the ground at a 1:1 scale to form a cantilever main beam unit. The cantilever main beam in the cantilever main beam unit is welded with lifting lugs. The welding position of the lifting lugs is calculated by architectural modeling software so that the center of gravity of the cantilever main beam unit is consistent with the position of the lifting rope during on-site hoisting. S4. Hoisting of the cantilever main beam units: According to the building construction drawings, the cantilever units are hoisted and positioned in sequence, and the cantilever main beams and lower support I-beams are fixedly connected to the building; after the hoisting and fixing of all cantilever main beam units are completed, columns are welded between the cantilever main beams of the first and second cantilever supports to form a three-dimensional truss structure. S5. Weld steel connecting beams, erect scaffolding on the steel connecting beams, and set up two layers of protection on the steel connecting beams and the support layer of the lower supporting I-beams: According to the construction drawings, weld steel connecting beams on the cantilever main beams at positions corresponding to the scaffolding uprights to form a cantilever platform; anti-slip reinforcement bars are welded on the steel connecting beams; install scaffolding uprights on the steel connecting beams and erect scaffolding; set up steel pipes parallel to the steel connecting beams at intervals on the cantilever platform, and lay wooden squares on the steel pipes to form the first layer of protection; at the same time, set up horizontal protection on the support layer of the lower supporting I-beams below the cantilever platform to form the second layer of protection; S6. Erect the formwork support system and carry out subsequent building construction work: The formwork support system is constructed according to the construction plan, and the edge protection is completed by the external protective scaffolding; the external protective scaffolding is disconnected from the formwork support system. During the cantilever structure, the outer scaffolding is only used as a working platform, and it will be converted into the outer scaffolding after the construction is completed. S7. Cantilever Platform Dismantling After Construction: When dismantling the cantilever platform, first unload the platform load before dismantling. Before dismantling, use hoisting equipment to secure the lifting lugs of the cantilever main beam with slings. Then cut the lower support I-beam and dismantle the connection point between the cantilever main beam and the building. After complete removal and loosening, use traction equipment to drag the cantilever main beam to the floor before cutting it and then hoisting it to the ground in sections. Workers performing cutting operations at height must wear safety belts, and guardrails that meet the specifications must be installed at the edges.

9. A construction method for a high-altitude, long-cantilever cast-in-place structural support system with a large corner in a building, as described in claim 8, is characterized in that... In S2, during the construction of the lower support layer building structure, the embedded parts of the lower support are selected according to the support position of the lower support I-beam: when the lower support is located on the lower edge beam of the main beam component, the lower support embedded parts are angle steel embedded parts; when the lower support is located on the building structure column or shear wall, the lower support embedded parts are flat plate embedded parts; the cross-sectional dimension error of the embedded parts should be less than 2mm, and the surface flatness should be less than 2mm during installation. During the construction of the cantilevered support structure, the U-shaped anchor rings are formed by cold bending U-shaped steel bar rings. Two U-shaped anchor rings are installed at the tail end of the cantilevered main beam of the building floor structure, with a spacing of 150mm-200mm between the two U-shaped anchor rings. The head end of the cantilevered main beam is anchored to the side beam of the building, less than 100mm from the side of the beam. When pre-embedding the U-shaped anchor rings, the U-shaped anchor rings extend into the steel mesh of the building structure and are fixed to the steel mesh by binding steel bars. The pre-embedded parts of all cantilevered main beams are set at the same height.

10. The construction method of a high-altitude long cantilever cast-in-place structure support system with a large corner as described in claim 8, characterized in that, In S5, when steel pipes are installed parallel to the steel beams on the cantilever platform, the spacing between the steel pipes is no more than 300mm. After laying timber on the steel pipes, double-layer formwork is fully laid to form the first layer of protection. The horizontal protection includes steel wire ropes, double-layer safety nets, and support rods. The support rods are installed in an outward-sloping manner on the support layer, with a horizontal angle of no less than 45°, and are installed parallel at intervals. The top of the support rods is fixed to the building structure where the cantilever platform is located by steel wire ropes. The double-layer safety net is laid between two adjacent support rods, and it includes an upper layer of dense mesh netting and a lower layer of safety netting.

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