Formwork structure for integrated pouring of multiple layers of cantilever plates and using method of formwork structure

Abstract

The invention discloses a formwork structure for integrated pouring of a multi-layer cantilever plate and a using method thereof.A parapet wall is arranged on the edge of one side of a roof structure, the multi-layer cantilever plate is arranged on the outer side of the parapet wall in a cantilever mode and formed by integrated pouring of a formwork structure, the formwork structure comprises a formwork assembly and a supporting assembly, and the supporting assembly is arranged on the outer side of the parapet wall; the formwork assembly defines a multi-layer cantilever plate pouring cavity and is supported by the supporting assembly. The using method comprises the steps that firstly, the inner handling frame is erected; secondly, an outer side formwork is erected; thirdly, reinforcing steel bars of the parapet wall body are bound; fourthly, cantilever plate reinforcing steel bars are bound; fifthly, a first layer of the supporting assembly is erected; sixthly, a first-layer parapet wall part formwork and a first-layer cantilever plate part formwork are erected; and seventhly, a second layer of the supporting assembly is erected. According to the technology, one-time pouring forming is achieved, the labor cost is saved, and the construction progress is accelerated.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a formwork structure for integrated casting of multi-story cantilever slabs and its application method. Background Technology

[0002] In the current residential construction field, with the continuous improvement of building quality requirements, residential projects are increasingly pursuing aesthetic appeal in building facades. To enhance the visual effect of building facades, many residential projects have adopted ultra-high parapet wall structures with multiple cantilever slabs in their designs. This type of structure, through the staggered arrangement of multiple cantilever slabs, can effectively improve the sense of layering and aesthetics of the building facade, and has therefore been widely used.

[0003] However, this type of ultra-high parapet wall structure with multiple cantilever slabs faces significant challenges during construction. Due to the presence of multiple cantilever slabs, the connection points between each slab and the vertical wall are complex, requiring high precision in construction operations, resulting in substantial overall construction difficulty.

[0004] Existing construction techniques for this structure typically involve setting construction joints based on the location of the cantilever slab, and then pouring concrete in sections according to the division of construction joints, focusing on the cantilever slab at the construction joint location and the vertical structure below the construction joint. With this method, construction work on the upper cantilever slab and its corresponding vertical structure can only commence after the lower-level poured concrete structure has reached the designed strength and the lower-level formwork has been removed.

[0005] This segmented pouring construction method has obvious drawbacks: on the one hand, due to the limited curing strength of the underlying structure and the progress of formwork removal, the waiting time between each construction segment is relatively long, resulting in a significant extension of the overall construction cycle; on the other hand, segmented construction requires multiple processes such as formwork erection and concrete pouring, which not only increases labor input but also increases the turnover cost of materials, resulting in a significant increase in labor costs and is not conducive to efficient and economical construction of the project.

[0006] Therefore, how to reduce the construction difficulty and cost of ultra-high parapet wall structures with multiple cantilever slabs, while accelerating the construction progress, has become an urgent technical problem to be solved in the construction of this type of building structure. Summary of the Invention

[0007] The purpose of this invention is to provide a template structure and its application method for integrated casting of multi-layer cantilever slabs, which solves the problems of long construction cycle and high cost of traditional segmented casting.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A template structure for integrated casting of multi-layer cantilever slabs includes a parapet wall at one edge of the roof structure, and multi-layer cantilever slabs cantilevered on the outside of the parapet wall. The multi-layer cantilever slabs are integrally cast from the template structure. The template structure includes template components and support components. The template components enclose the casting cavity of the multi-layer cantilever slabs and are supported by the support components. The template assembly includes an inner template and an outer template. The inner template and the outer template are arranged opposite to each other and are sealed on both sides by side plates to form a cavity structure. Multiple inner wooden blocks are evenly spaced on the inner side of the inner template, and an inner fixing frame is provided on the inner side of the inner wooden blocks. Multiple outer wooden blocks are evenly spaced on the outer side of the outer template, and an outer fixing frame is provided on the outer side of the outer wooden blocks. The outer fixing frame and the inner fixing frame are connected by multiple tie rods. The outer fixing frame includes a cantilever support and a connecting support. The cantilever support is supported at the cantilever of the outer template, and the connecting support is connected between two adjacent cantilever supports. The cantilever support includes a first main beam and a second main beam. The first main beam and the second main beam are symmetrical and form a U-shape when connected. They are located at the cantilever of the outer template. A connecting end is provided on the side of both the first main beam and the second main beam for connecting to the connecting support. The support assembly includes multiple interlayer supports, which are positioned between the two cantilever supports.

[0009] Preferably, the dimensions of the first main truss and the second main truss are adapted to the design dimensions of the cantilever slab.

[0010] Preferably, the connecting support is a square steel pipe.

[0011] Preferably, an internal operating frame is erected inside the parapet wall. The internal operating frame includes an internally fastened scaffold and a guardrail. The internally fastened scaffold is installed on the roof structure, and the guardrail is installed at the top of the internally fastened scaffold.

[0012] Preferably, the outer template is a planar plate structure.

[0013] Preferably, the inner template includes a parapet wall template and a cantilever slab template. The parapet wall template includes multiple planar templates, which are alternately arranged with the cantilever slab template. The cantilever slab template is a cavity with an opening at one end, and the upper and lower sides of the opening end of the cavity are connected to the planar template.

[0014] Preferably, the bottom end of the interlayer support is inserted into the insertion hole on the first main rib of the next layer, and the top end is pressed against the bottom surface of the second main rib of the previous layer by a clamping member. The clamping member includes a screw area and a top plate area. The bottom of the screw area is connected to the top end of the interlayer support, and a top plate is provided at the top end of the screw area for pressing against the bottom surface of the second main rib.

[0015] Preferably, the first main shank and the second main shank are connected by anti-buoyancy bolts, and fixed at the joint of the first main shank and the second main shank by fasteners.

[0016] A method for using a formwork structure for integrated casting of multi-story cantilever slabs includes the following steps: Step 1: Erection of internal working scaffold: Erect an internally fastened scaffold inside the parapet wall and above the roof structure, and then install the guardrails on the top of the internally fastened scaffold. Step 2: Erecting the outer formwork: Erect the outer formwork and temporarily fix it; Step 3: Reinforcing steel bar binding of the parapet wall: The binding work is completed with the help of the internal working frame; Step 4: Reinforcement binding of cantilever slab: The binding operation is completed with the help of the internal working frame; Step 5: First layer of support components erection: Complete the erection of the first layer of inter-layer supports; Step 6: Erection of the first-floor parapet wall formwork and the first-floor cantilever slab formwork: First, erect the first-floor planar formwork and temporarily fix it, then erect the first-floor parapet wall formwork and temporarily fix it; Step 7: Second layer of support components erection: Complete the erection of the second layer of inter-layer supports; Step 8: Erection of the second-layer parapet wall formwork and the second-layer cantilever slab formwork: First, erect the second-layer planar formwork and temporarily fix it, then erect the second-layer parapet wall formwork and temporarily fix it; Step 9: Erect the supporting components, parapet wall formwork, and second-floor cantilever slab formwork alternately to the designed height; Step 10: Use inner timber, inner fixing frame, outer timber, outer fixing frame and tie rod to support, fix and connect the inner and outer formwork; Step 11: Seal the side plates to form an integrated cast-in-place cavity; Step 12: Integral casting to form the parapet wall and multi-layer cantilever slab.

[0017] In this invention, a support component is used as a support system to achieve one-time casting of the template component, which saves labor costs and speeds up the construction progress compared with the multiple casting of the prior art.

[0018] The template components can be combined in different ways according to the height of the parapet wall and the number of cantilever slab layers. They are suitable for various ultra-high parapet wall structures with multiple cantilever slabs, which enhances the flexibility and applicability of the technology and reduces costs.

[0019] This method employs a layered, alternating erection of interlayer supports and inner formwork, enabling simultaneous layered construction of formwork and support components. This avoids the curing time required for lower layers in traditional layered pouring. After all formwork and support components are installed, the side panels are sealed to form a complete pouring cavity. Concrete pouring of the parapet wall and multi-layered cantilever slabs is then completed sequentially. This eliminates construction joints found in traditional segmented construction, improves overall integrity, and reduces repetitive steps in formwork erection and dismantling and concrete pouring, thus shortening the construction cycle.

[0020] The inner fixing frame provides overall fixation and support for the inner template, while the outer fixing frame provides overall fixation and support for the outer template, thereby increasing the overall rigidity and stability of the fixing support.

[0021] The first and second main beams are fixedly connected by anti-buoyancy bolts, which ensures the anti-buoyancy stability of the template assembly. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a schematic diagram of the first main truss structure of the present invention; Figure 4 This is a schematic diagram of the second main truss structure of the present invention; In the diagram: 1. Roof structure; 2. Cantilever slab; 3. Formwork assembly; 4. Support assembly; 5. Parapet wall; 6. Internal working frame; 30. Inner formwork; 31. Outer formwork; 32. Inner timber; 33. Inner fixing frame; 34. Outer timber; 35. Outer fixing frame; 36. Tie rod; 40. Inter-layer support; 60. Internal scaffolding; 61. Guardrail; 300. Parapet wall formwork; 301. Cantilever slab formwork; 350. Cantilever support; 351. Connecting support; 3000. Planar formwork; 3500. First main beam; 3501. Second main beam; 3502. Connecting end; 3503. Insertion hole; 3504. Tightening component; 3505. Anti-buoyancy bolt; Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings: like Figures 1-4The template structure shown is used for the integrated casting of multi-layer cantilever slabs. A parapet wall 5 is set at one edge of the roof structure 1, and a multi-layer cantilever slab 2 is cantilevered on the outside of the parapet wall 5. The multi-layer cantilever slab 2 is integrally cast from the template structure.

[0024] The template structure includes template components 3 and support components 4. The template components 3 enclose the casting cavity of the multi-layer cantilever slab 2 and are supported by the support components 4.

[0025] The template assembly 3 includes an inner template 30 and an outer template 31. The inner template 30 and the outer template 31 are arranged opposite each other and sealed on both sides by side plates to form a cavity structure, providing a closed space foundation for integrated casting.

[0026] In this example, the outer formwork 31 is a flat plate structure, simplifying the installation process. The inner formwork 30 includes a parapet wall formwork 300 and a cantilever slab formwork 301. The parapet wall formwork 300 includes multiple flat formwork panels 3000, which are alternately arranged with the cantilever slab formwork 301. The cantilever slab formwork 301 is a cavity with an opening at one end, and the upper and lower sides of the opening end of the cavity are connected to the flat formwork 3000.

[0027] Multiple inner timber beams 32 are evenly spaced along the inner side of the inner formwork 30, and inner fixing frames 33 are installed inside the inner timber beams 32. Multiple outer timber beams 34 are evenly spaced along the outer side of the outer formwork 31, and outer fixing frames 35 are installed outside the outer timber beams 34. The outer fixing frames 35 and inner fixing frames 33 are connected by multiple tie rods 36. This double-layer reinforcement structure of "timber beams + support frames" enhances the overall rigidity of the formwork assembly and prevents formwork deformation caused by lateral pressure from concrete during pouring.

[0028] The outer fixing frame 35 includes cantilever support 350 and connecting support 351. The cantilever support 350 supports the cantilever of the outer template 31, and the connecting support 351 connects two adjacent cantilever supports 350 to form a modular support unit, which is convenient for installation and disassembly. In this example, the connecting support 351 is a square steel pipe.

[0029] The cantilever support 350 includes a first main truss 3500 and a second main truss 3501, the dimensions of which are adapted to the design dimensions of the cantilever slab 2. The first main truss 3500 and the second main truss 3501 are symmetrical and form a U-shape when connected, positioned at the cantilever point of the outer template 31. A connecting end 3502 is provided on the side of both the first main truss 3500 and the second main truss 3501 for connection to the connecting support 351. In this example, the first main truss 3500 and the second main truss 3501 are connected by anti-buoyancy bolts 3505, and fasteners are used to secure them at the joint, improving the load-bearing capacity of the cantilever area.

[0030] Support component 4 includes multiple interlayer supports 40, which are positioned between two cantilever supports 350, forming a layered independent support system. This avoids the risk of one layer's failure affecting multiple layers in traditional integral supports. The bottom end of the interlayer support 40 is inserted into the insertion hole 3503 on the first main rib 3500 of the next layer, and the top end is tightened to the bottom surface of the second main rib 3501 of the upper layer via a tightening member 3504. The tightening member 3504 includes a screw section and a top plate section. The bottom of the screw section is threaded and connected to the top of the interlayer support 40. A top plate is provided at the top of the threaded section for tightening to the bottom surface of the second main rib 3501. The tightening height can be adjusted by rotating the screw section, adapting to construction requirements that do not vary in floor height. At the same time, the top plate section increases the contact area with the second main rib 3501, preventing excessive local pressure from causing deformation of the second main rib 3501 and improving the stability and flexibility of the vertical support. The 3504 clamping component can adapt to the construction needs of multi-story cantilever slabs with different floor heights and cantilever lengths.

[0031] An inner working platform 6 is erected inside the parapet wall 5. The inner working platform 6 includes an inner-locking scaffold 60 and a guardrail 61. The inner-locking scaffold 60 is set on the roof structure 1, and the guardrail 61 is set on top of the inner-locking scaffold 60. The inner working platform 6 provides a stable operating platform for processes such as the installation of the inner formwork 30 and the binding of reinforcing bars. The guardrail 61 ensures the safety of construction personnel. This solves the problems of high difficulty and low safety of traditional outer working platforms. At the same time, the inner working platform is located inside and does not affect the installation of the outer formwork and supporting components, thus improving construction efficiency.

[0032] A method for using a formwork structure for integrated casting of multi-story cantilever slabs includes the following steps: Step 1: Erection of internal working scaffold 6: Erect an internally fastened scaffold 60 on the inside of the parapet wall 5 and above the roof structure 1, and then install the guardrail 61 on the top of the internally fastened scaffold 60. Step 2: Erecting the outer formwork 31: Erect the outer formwork 31 and temporarily fix it; Step 3, Parapet Wall 5 Reinforcing Steel Binding: Complete the binding operation with the help of the internal operating frame 6; Step 4, Reinforcing bar binding of cantilever slab 2: The binding operation is completed with the help of the inner operating frame 6; Step 5: Erection of the first layer of support component 4: Complete the erection of the first layer of inter-layer support 40; Step 6: Erection of the first-layer parapet wall formwork 300 and the first-layer cantilever slab formwork 301: First, erect the first-layer planar formwork 3000 and temporarily fix it, then erect the first-layer parapet wall formwork 300 and temporarily fix it; Step 7: Erection of the second layer of support component 4: Complete the erection of the second layer interlayer support 40; Step 8: Erection of the second-layer parapet wall formwork 300 and the second-layer cantilever slab formwork 301: First, erect the second-layer planar formwork 3000 and temporarily fix it, then erect the second-layer parapet wall formwork 300 and temporarily fix it. Step 9: Erect support components 4, parapet wall formwork 300 and second-floor cantilever slab formwork 301 alternately to the design height; Step 10: Use the inner timber 32, inner fixing frame 33, outer timber 34, outer fixing frame 35 and tie rod 36 to support, fix and connect the inner template 30 and the outer template 31; Step 11: Seal the side plates to form an integrated cast-in-place cavity; Step 12: Integral casting and molding of parapet wall 5 and multi-layer cantilever slab 2.

[0033] The above embodiments are merely illustrative of the concept and implementation of the present invention and are not intended to limit it. Under the concept of the present invention, technical solutions without substantial changes are still within the scope of protection.

Claims

1. A formwork structure for integral casting of multi-layer cantilever slabs, wherein a parapet wall (5) is provided at one edge of a roof structure (1), and a multi-layer cantilever slab (2) is cantilevered on the outside of the parapet wall (5), the multi-layer cantilever slab (2) being integrally cast from the formwork structure, characterized in that: The template structure includes a template component (3) and a support component (4). The template component (3) encloses the casting cavity of the multi-layer cantilever slab (2) and is supported by the support component (4). The template assembly (3) includes an inner template (30) and an outer template (31). The inner template (30) and the outer template (31) are arranged opposite to each other and sealed on both sides by side plates to form a cavity structure. Multiple inner wooden blocks (32) are evenly spaced inside the inner template (30). An inner fixing frame (33) is provided inside the inner wooden blocks (32). Multiple outer wooden blocks (34) are evenly spaced outside the outer template (31). An outer fixing frame (35) is provided outside the outer wooden blocks (34). The outer fixing frame (35) and the inner fixing frame (33) are connected by multiple tie rods (36). The outer fixing frame (35) includes a cantilever support (350) and a connecting support (351). The cantilever support (350) is supported at the cantilever of the outer template (31), and the connecting support (351) is connected between two adjacent cantilever supports (350). The cantilever support (350) includes a first main truss (3500) and a second main truss (3501). The first main truss (3500) and the second main truss (3501) are symmetrical and form a U-shape after being connected. They are located at the cantilever of the outer template (31). A connecting end (3502) is provided on the side of both the first main truss (3500) and the second main truss (3501) for connecting to the connecting support (351). The support assembly (4) includes a plurality of interlayer supports (40) which are supported between two cantilever supports (350).

2. The formwork structure for integrated casting of multi-layer cantilever slabs according to claim 1, characterized in that: The dimensions of the first main truss (3500) and the second main truss (3501) are adapted to the design dimensions of the cantilever slab (2).

3. The formwork structure for integrated casting of multi-layer cantilever slabs according to claim 1, characterized in that: The connecting support (351) is a square steel pipe.

4. The formwork structure for integrated casting of multi-layer cantilever slabs according to claim 1, characterized in that: An inner operating frame (6) is erected inside the parapet wall (5). The inner operating frame (6) includes an inner-locked scaffold (60) and a guardrail (61). The inner-locked scaffold (60) is set on the roof structure (1), and the guardrail (61) is set on the top of the inner-locked scaffold (60).

5. The formwork structure for integrated casting of multi-layer cantilever slabs according to claim 1, characterized in that: The outer template (31) is a planar plate structure.

6. The formwork structure for integrated casting of multi-layer cantilever slabs according to claim 5, characterized in that: The inner template (30) includes a parapet wall template (300) and a cantilever slab template (301). The parapet wall template (300) includes multiple planar templates (3000), which are alternately arranged with the cantilever slab template (301). The cantilever slab template (301) is a cavity with an opening at one end, and the upper and lower sides of the opening end of the cavity are connected to the planar template (3000).

7. The formwork structure for integrated casting of multi-layer cantilever slabs according to claim 1, characterized in that: The bottom end of the interlayer support (40) is inserted into the insertion hole (3503) on the first main shank (3500) located in the next layer, and the top end is pressed against the bottom surface of the second main shank (3501) located in the upper layer by a clamping member (3504). The clamping member (3504) includes a screw area and a top plate area. The bottom of the screw area is connected to the top of the interlayer support (40), and a top plate is provided at the top of the screw area for pressing against the bottom surface of the second main shank (3501).

8. The formwork structure for integrated casting of multi-layer cantilever slabs according to claim 7, characterized in that: The first main shank (3500) and the second main shank (3501) are connected by anti-buoyancy bolts (3505), and are fixed by fasteners at the joint of the first main shank (3500) and the second main shank (3501).

9. A method for using a formwork structure for integrated casting of multi-story cantilever slabs according to claims 1-8, characterized in that, Includes the following steps: Step 1, Erection of internal working scaffold (6): Erect an internal scaffold (60) inside the parapet wall (5) and above the roof structure (1), and then install the guardrail (61) on the top of the internal scaffold (60); Step 2, Erection of the outer formwork (31): Erect the outer formwork (31) and temporarily fix it; Step 3, Parapet Wall (5) Reinforcing Steel Binding: Complete the binding operation with the help of the internal operating frame (6); Step 4, Reinforcement binding of cantilever slab (2): Binding is completed with the help of the inner operating frame (6); Step 5, Support Components (4) First Layer Erection: Complete the erection of the first layer inter-layer support (40); Step 6: Erection of the first-floor parapet wall formwork (300) and the first-floor cantilever slab formwork (301): First, erect the first-floor planar formwork (3000) and temporarily fix it, then erect the first-floor parapet wall formwork (300) and temporarily fix it; Step 7, Second layer construction of support components (4): Complete the construction of the second layer interlayer support (40); Step 8: Erection of the second-layer parapet wall formwork (300) and the second-layer cantilever slab formwork (301): First, erect the second-layer planar formwork (3000) and temporarily fix it, then erect the second-layer parapet wall formwork (300) and temporarily fix it; Step 9: The supporting components (4), the parapet wall formwork (300), and the second-floor cantilever slab formwork (301) are alternately erected to the design height; Step 10: Use the inner timber (32), inner fixing frame (33), outer timber (34), outer fixing frame (35) and tie rod (36) to support, fix and connect the inner template (30) and the outer template (31); Step 11: Seal the side plates to form an integrated cast-in-place cavity; Step 12: Integral casting to form parapet wall (5) and multi-layer cantilever slab (2).

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