Bolted triangular support frame for cantilever structure plate construction and method of installing same

Abstract

This invention relates to the field of building support frame technology, and discloses a bolt-connected triangular support frame for cantilevered structural slab construction and its installation method. A horizontal cantilever beam is horizontally supported on the existing floor slab of the building and has a cantilevered section extending beyond the building's outer side. Diagonal braces are connected to the cantilevered section of the horizontal cantilever beam via a first connecting steel plate and bolts. Multiple anchoring mechanisms are installed between the horizontal cantilever beam and the floor slab to anchor the horizontal cantilever beam to the floor slab. Embedded parts are pre-embedded in the lower structure of the floor slab, and the end of the diagonal brace away from the horizontal cantilever beam is connected to the embedded parts via a second connecting steel plate and bolts. The horizontal cantilever beam, diagonal braces, and floor slab constitute a triangular stable support system. This invention features strong structural stability, reusable components, convenient construction, and easy quality control.

Description

Technical Field

[0001] This invention relates to the field of building support frame technology, and in particular to a bolt-connected triangular support frame for cantilevered structural slab construction and its installation method. Background Technology

[0002] Currently, in high-rise building construction, the construction of cantilever slabs typically employs ground-supported scaffolding or steel pipe cantilever support frames. However, ground-supported scaffolding technology has the following drawbacks: it consumes a large amount of reusable materials, has a long construction period, poses safety hazards, and is difficult to meet the actual needs of projects. Steel pipe cantilever support systems, on the other hand, have the following problems: large vertical deflection, low overall stiffness, and a lack of absolute safety, making them particularly unsuitable for the construction of large-span or large cantilever structures. Therefore, there is an urgent need for a cantilever slab construction support system that is stiff, easy to construct, and safe and reliable. Summary of the Invention

[0003] The purpose of this invention is to provide a bolt-connected triangular support frame for the construction of cantilever slabs and its installation method, aiming to solve or improve at least one of the above-mentioned technical problems, with strong structural stability, reusable components, convenient construction, and easy quality control.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides a bolted triangular support frame for the construction of cantilevered structural slabs, comprising: A horizontal cantilever beam is used to be horizontally supported on the existing floor slab of a building and has a cantilever section extending outward from the building. The diagonal brace is connected to the cantilever section of the horizontal cantilever beam via a first connecting steel plate and bolts; Multiple anchoring mechanisms are provided between the horizontal cantilever beam and the floor slab to anchor the horizontal cantilever beam to the floor slab. An embedded part is embedded in the lower structure of the floor slab, and the end of the diagonal brace away from the horizontal cantilever beam is connected to the embedded part through a second connecting steel plate and bolts; The horizontal cantilever beam, the diagonal brace, and the floor slab constitute a triangular stable support system.

[0005] Optionally, the anchoring mechanism includes: Multiple sleeves are pre-embedded in the floor slab; Multiple compression members pass through the sleeve and protrude from the upper surface of the horizontal cantilever beam and the lower surface of the floor slab, and are threaded at their ends; A pair of shaped steel plates are disposed above the flange of the horizontal cantilever beam and below the floor slab, and the compression member passes through the shaped steel plates and is fastened by nuts.

[0006] Optionally, the anchoring mechanism consists of three layers: the first layer is located 100mm from the outer edge of the building, the third layer is located at the end of the horizontal cantilever beam, and the second layer is 200mm from the third layer.

[0007] Optionally, multiple positioning steel bars are provided on the top surface of the cantilever section of the horizontal cantilever beam, and the positioning steel bars are used for positioning the uprights of the formwork support.

[0008] Optionally, the positioning steel bar has a diameter of 25mm and a length of 150mm, and is welded to the center line of the top surface of the horizontal cantilever beam.

[0009] Optionally, a sweeping rod is installed on the upright of the formwork support frame at a distance of 200mm from the horizontal cantilever beam.

[0010] Optionally, the embedded component includes an embedded steel plate and an embedded anchor bar welded to the embedded steel plate.

[0011] Optionally, the horizontal cantilever beam is an I-beam.

[0012] Optionally, the diagonal brace is a double-channel steel, arranged back to back, with the first connecting steel plate and the second connecting steel plate sandwiched in the middle.

[0013] The present invention also provides a method for installing a bolted triangular support frame for the construction of cantilever slab structures, comprising the following steps: Step 1: Prefabricate horizontal cantilever beams, diagonal braces, and embedded parts; Step 2: Before pouring concrete for the building's structural floor slab, install the embedded parts and anchoring mechanism. Step 3: Place the horizontal cantilever beam on the floor slab according to the position of the pre-embedded anchoring mechanism, so that the length of the cantilever section of the horizontal cantilever beam meets the installation and operation space of the diagonal brace. Connect the upper end of the diagonal brace to the cantilever section of the horizontal cantilever beam through the first connecting steel plate and bolts, and connect the lower end of the diagonal brace to the pre-embedded part through the second connecting steel plate and bolts. Step 4: Push the horizontal cantilever beam with the connected diagonal braces outward to make it fit tightly against the structural floor slab, and then anchor the horizontal cantilever beam using the anchoring mechanism; Step 5: Erect formwork on the cantilever section of the horizontal cantilever beam.

[0014] This invention discloses the following technical advantages: A triangular stable support system is constructed using horizontal cantilever beams, diagonal braces, and floor slabs. This triangular support system has high overall rigidity, effectively bearing the loads generated during the construction of the cantilevered structural slab and ensuring construction safety. Most components are connected by bolts, facilitating easy assembly and disassembly, increasing recyclability, and reducing material waste and construction costs. Extensive high-altitude welding work is avoided, simplifying construction procedures and accelerating construction progress. Components are prefabricated in the factory and assembled on-site, ensuring high installation precision and facilitating construction quality control. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the anchoring mechanism structure of the present invention; Figure 3 This is a schematic diagram of the shaped steel plate structure of the present invention; Figure 4 This is a schematic diagram of the embedded part structure of the present invention; Figure 5 This is a side view of the embedded part structure of the present invention.

[0016] In the diagram: 1. Horizontal cantilever beam; 2. Shaped steel plate; 3. Compression member; 4. Nut; 5. Sleeve; 7. Floor slab; 8. Formwork support upright; 9. Diagonal brace; 10. Embedded part; 11. First connecting steel plate; 14. Embedded steel plate; 15. Embedded anchor bar; 16. Second connecting steel plate. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Reference Figures 1 to 5This invention provides a bolted triangular support frame for the construction of cantilevered structural slabs, comprising: a horizontal cantilever beam 1, for horizontal support on an existing floor slab 7 of a building, and having a cantilevered section extending outward from the building; a diagonal brace 9, connected to the cantilevered section of the horizontal cantilever beam 1 via a first connecting steel plate 11 and bolts; a multi-anchoring mechanism, disposed between the horizontal cantilever beam 1 and the floor slab 7, for anchoring the horizontal cantilever beam 1 to the floor slab 7; and an embedded part 10, embedded in the lower structure of the floor slab 7, wherein one end of the diagonal brace 9 away from the horizontal cantilever beam 1 is connected to the embedded part 10 via a second connecting steel plate 16 and bolts; wherein the horizontal cantilever beam 1, the diagonal brace 9, and the floor slab 7 constitute a triangular stable support system.

[0020] By forming a triangular stable support system with the horizontal cantilever beam 1, diagonal brace 9, and existing floor slab 7, the self-stabilizing characteristics of the structure are fully utilized, thereby improving the overall load-bearing capacity and deformation resistance. This method is not only applicable to the construction of cantilever slabs in high-rise buildings, but can also be extended to temporary or permanent cantilever structures such as bridges and platforms, demonstrating good versatility and promotional value.

[0021] Furthermore, the first connecting steel plate 11 and the second connecting steel plate 16 are 12mm thick and are connected by 14mm bolts.

[0022] In this embodiment, the anchoring mechanism includes: multiple sleeves 5, pre-embedded in the floor slab 7, the sleeves being made of ф25 PVC material; multiple compression members 3, each passing through the sleeves 5 and protruding from the upper surface of the horizontal cantilever beam 1 and the lower surface of the floor slab 7, with threads at their ends; and a pair of shaped steel plates 2, positioned above the flange of the horizontal cantilever beam 1 and below the floor slab 7, with the compression members 3 passing through the shaped steel plates 2 and secured by nuts 4. Through the combined use of the pre-embedded sleeves 5, compression members 3, and shaped steel plates 2, reliable anchoring between the horizontal cantilever beam 1 and the floor slab 7 is achieved. The clamping of the shaped steel plates 2 from both above and below, and the securing with nuts 4, ensures that the horizontal cantilever beam 1 does not shift or overturn during use, improving the overall pull-out resistance and anti-slip capability of the anchoring system.

[0023] Furthermore, the shaping steel plate 2 is made of Q235 steel, with a size of 200mm×100mm×12mm, and a reserved hole with a diameter of 22mm is set in the middle position. The pressure member 3 is made of HPB235 hot-rolled plain round steel bar, and the thread length of the end of the pressure member 3 is 200mm, and the upper corner is rounded.

[0024] In this embodiment, the anchoring mechanism consists of three layers. The first layer is located 100mm from the outer edge of the building, the third layer is located at the end of the horizontal cantilever beam 1, and the second layer is 200mm from the third layer. These three anchoring mechanisms, rationally distributed at key locations, form a multi-point anchoring system. Even if one anchoring point fails due to pre-embedding deviation or external force damage, the remaining anchoring points can still provide sufficient anchoring force, enhancing the safety redundancy of the support frame. This is particularly suitable for harsh construction environments such as high altitudes and strong winds.

[0025] In this embodiment, multiple positioning steel bars are provided on the top surface of the cantilever section of the horizontal cantilever beam 1. These positioning steel bars are used to position the formwork support uprights 8. Providing positioning steel bars on the top surface of the cantilever section allows for precise positioning of the formwork support uprights 8, preventing them from shifting during construction and ensuring the overall verticality and uniform stress distribution of the formwork support. This design simplifies the on-site layout process, improves erection efficiency, and avoids eccentric stress problems caused by the shifting of the formwork support uprights 8.

[0026] In this embodiment, the positioning reinforcing bar has a diameter of 25mm and a length of 150mm, and is welded to the center line of the top surface of the horizontal cantilever beam 1. Using a positioning reinforcing bar with a diameter of 25mm and a length of 150mm, welded to the center line of the top surface of the cantilever beam, provides good bending stiffness and welding stability. This specification of reinforcing bar provides sufficient positioning accuracy without excessively increasing the self-weight of the cantilever beam, and is easy to process and install, making it an economical and practical technical solution.

[0027] In this embodiment, a ground-level bracing is installed on the upright of the formwork support 8 at a distance of 1200mm from the horizontal cantilever beam. Installing a ground-level bracing on the upright of the formwork support 8 at a distance of 200mm from the cantilever beam effectively restrains the bottom displacement of the upright and enhances the overall stability of the formwork support. This design conforms to conventional formwork erection specifications, facilitates operation by construction personnel, and improves the lateral displacement resistance of the support, making it particularly suitable for situations with large dynamic loads during the construction of cantilever slab structures.

[0028] Furthermore, the uprights of the formwork support frame 8 are made of φ48mm×3.5mm steel pipes, with a longitudinal spacing of 1.0m and a step spacing of 1.5m.

[0029] In this embodiment, the embedded part 10 includes an embedded steel plate 14 and an embedded anchor bar 15 welded to the embedded steel plate 14. The embedded part 10 is formed by welding the embedded steel plate 14 and the embedded anchor bar, which has a simple structure and high load-bearing capacity. The embedded anchor bar forms a mechanical anchorage with the concrete, which enhances the bonding force between the embedded part 10 and the lower structure of the floor slab 7, ensures the rigidity and reliability of the lower connection point of the diagonal brace 9, and avoids the instability of the support system caused by the loosening of the connection point.

[0030] Furthermore, the embedded steel plate 14 is made of 200mm×200mm×12mm A3 steel plate, and the embedded anchor bar 15 is made of 12mm diameter threaded steel bar.

[0031] Furthermore, the first connecting steel plate 11 and the horizontal cantilever beam 1, as well as the second connecting steel plate 16 and the embedded steel plate 14, are connected by welding, with a weld height of 6mm.

[0032] In this embodiment, the horizontal cantilever beam 1 is an I-beam. Using I-beams as the horizontal cantilever beam 1 provides excellent bending resistance and a high strength-to-weight ratio. Its cross-sectional shape facilitates bolting connections with anchoring mechanisms, diagonal braces 9, and other components. Furthermore, I-beams are standardized profiles, making them easy to procure and process, thus reducing manufacturing costs and improving construction efficiency.

[0033] In this embodiment, the diagonal brace 9 is made of double-section channel steel, arranged back-to-back, with a first connecting steel plate 11 and a second connecting steel plate 16 sandwiched in the middle. The double-section channel steel, arranged back-to-back with the first connecting steel plate 11 sandwiched in the middle, forms a closed cross-section, which significantly improves the compressive and torsional resistance of the diagonal brace. This structure ensures the overall rigidity of the diagonal brace 9, and facilitates connection with the horizontal cantilever beam 1 and the embedded part 10 via bolts. It is flexible in installation, easy to disassemble, and suitable for repeated use.

[0034] Furthermore, when multiple support frames of the present invention are used, the spacing is 1000mm, that is, one is set every 1000mm in the longitudinal direction, which is the same as the longitudinal spacing of the support frame uprights 8.

[0035] The present invention also provides a method for installing a bolted triangular support frame for the construction of cantilever slab structures, comprising the following steps: Step 1: Prefabricate the horizontal cantilever beam 1, diagonal brace 9, and embedded parts 10. Specifically, based on the cantilever length of the horizontal cantilever beam 1 and the floor height, lay out the diagonal brace 9 at a 1:1 scale to determine its length, opening position, and cutting angle, and reserve allowance for shrinkage and cutting. Based on the data determined by the layout, cut the diagonal brace 9 in the processing area on the construction site. The cutting of the diagonal brace 9 should be done by sawing to prevent deformation. Fully weld the pre-made triangular second connecting steel plate 16 to the embedded steel plate 14, with a weld height of 6mm. Since the horizontal cantilever beam 1 and the diagonal brace 9 are connected by bolts, a 12mm thick triangular opening first connecting steel plate 11 needs to be welded at the bottom of the horizontal cantilever beam 1, 1m from the end.

[0036] Step 2: Before pouring concrete for the building's structural floor slab, install the embedded parts 10 and anchoring mechanisms. Specifically, before pouring concrete for the structural floor slab below floor slab 7, embed a 200mm×200mm×12mm steel plate 14 at the edge beam location. When binding the reinforcing bars of floor slab 7 where the horizontal cantilever beam 1 is located, embed the sleeve 5 before the structural concrete construction. Three compression members 3 are installed. The first is located 100mm from the outer edge of the building, the third is at the end of the horizontal cantilever beam 1, and the second is 200mm from the third. When the third compression member fails (due to improper embedding, external force damage, etc.), the second member will be responsible for the load.

[0037] Step 3: Place the horizontal cantilever beam 1 on the floor slab 7 according to the position of the pre-embedded anchoring mechanism, ensuring that the cantilever length of the horizontal cantilever beam 1 meets the installation and operation space of the diagonal brace 9. Connect the upper end of the diagonal brace 9 to the cantilever section of the horizontal cantilever beam 1 using the first connecting steel plate 11 and bolts, and connect the lower end of the diagonal brace 9 to the pre-embedded part 10 using the second connecting steel plate 16 and bolts. Specifically, the diagonal brace 9 is connected to the horizontal cantilever beam 1 and the pre-embedded part 10 within the working range of the external scaffolding using φ14mm high-strength bolts. Based on the position of the pre-embedded sleeve 5, the horizontal cantilever beam 1 is installed on the floor, and its connection to the building structure is achieved by horizontal support on the building floor slab structure. The outward extension length of the cantilever beam during positioning is determined to allow workers on the external scaffolding to bolt the diagonal brace 9 to the horizontal cantilever beam 1.

[0038] Step 4: Push the horizontal cantilever beam 1, connected to the diagonal brace 9, outward to ensure it is in close contact with the structural floor slab 7. Then, anchor the horizontal cantilever beam 1 using the anchoring mechanism. Specifically, after the diagonal brace 9 is connected to the horizontal cantilever beam 1, extend the horizontal cantilever beam 1 outward to ensure it is in close contact with the structural surface. First, pass the compression member 3 through the sleeve 5 from bottom to top. First, add the shaped steel plate 2 and nut 4 to the lower part and tighten them. Then, add the shaped steel plate 2 and nut 4 to the upper part. Align the perforated part of the shaped steel plate 2 with the compression member 3 to press down on the flange of the horizontal cantilever beam 1. Place the steel plate against the bottom surface of the structural floor slab 7, then add shims and nuts, and tighten the nuts with a wrench.

[0039] Step 5: Erect formwork supports on the cantilever section of the horizontal cantilever beam 1. Specifically, mark the positions of the formwork support uprights 8 on the cantilever section of the horizontal cantilever beam 1 according to the longitudinal and transverse spacing of the formwork supports. Weld φ25mm positioning steel bars (150mm in length) to the center line of the upper flange on the horizontal cantilever beam 1 as fulcrums for the formwork support uprights 8 to ensure that the formwork support uprights 8 do not shift and the horizontal cantilever beam 1 is not subjected to eccentric stress. The formwork support uprights 8 are made of φ48mm×3.5mm steel pipes, with a longitudinal spacing of 1.0m and a step spacing of 1.5m. A ground-level bracing is installed 1200mm away from the horizontal cantilever beam. Vertical scissor bracing is installed on the outer side of the support from bottom to top, covering the entire height, length, and facade.

[0040] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "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 this invention, and are not intended to 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 this invention.

[0041] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A bolt-connected triangular support frame for the construction of cantilever slab structures, characterized in that, include: A horizontal cantilever beam (1) is used to be horizontally supported on the existing floor slab (7) of the building and has a cantilever section extending out of the building; The diagonal brace (9) is connected to the cantilever section of the horizontal cantilever beam (1) via a first connecting steel plate (11) and bolts; Multiple anchoring mechanisms are provided between the horizontal cantilever beam (1) and the floor slab (7) to anchor the horizontal cantilever beam (1) to the floor slab (7); The embedded part (10) is embedded in the lower structure of the floor slab (7). The end of the diagonal brace (9) away from the horizontal cantilever beam (1) is connected to the embedded part (10) through the second connecting steel plate (16) and bolts. The horizontal cantilever beam (1), the diagonal brace (9), and the floor slab (7) constitute a triangular stable support system.

2. The bolted triangular support frame for cantilever slab construction according to claim 1, characterized in that, The anchoring mechanism includes: Multiple sleeves (5) are pre-embedded in the floor slab (7); Multiple compression members (3) pass through the sleeve (5) and protrude from the upper surface of the horizontal cantilever beam (1) and the lower surface of the floor slab (7), and are threaded at the ends; A pair of shaped steel plates (2) are set above the flange of the horizontal cantilever beam (1) and below the floor slab (7), and the pressure member (3) passes through the shaped steel plates (2) and is fastened by nuts (4).

3. The bolted triangular support frame for cantilever slab construction according to claim 1, characterized in that, The anchoring mechanism consists of three layers. The first layer is located 100mm from the outer edge of the building, the third layer is located at the end of the horizontal cantilever beam (1), and the second layer is 200mm from the third layer.

4. The bolted triangular support frame for cantilever slab construction according to claim 1, characterized in that, Multiple positioning steel bars are provided on the top surface of the cantilever section of the horizontal cantilever beam (1), and the positioning steel bars are used for positioning the formwork support poles (8).

5. A bolted triangular support frame for construction of a cantilevered slab according to claim 4, characterized in that, The positioning steel bar has a diameter of 25mm and a length of 150mm, and is welded to the center line of the top surface of the horizontal cantilever beam (1).

6. The bolted triangular support frame for cantilever slab construction according to claim 4, characterized in that, A sweeping rod is installed on the upright pole (8) of the formwork support frame at a distance of 200mm from the horizontal cantilever beam (1).

7. The bolted triangular support frame for construction of cantilever slabs according to claim 1, characterized in that, The embedded part (10) includes an embedded steel plate (14) and an embedded anchor bar (15) welded to the embedded steel plate (14).

8. The bolted triangular support frame for construction of cantilever slabs according to claim 1, characterized in that, The horizontal cantilever beam (1) is an I-beam.

9. A bolted triangular support frame for construction of a cantilevered slab according to claim 1, characterized in that, The diagonal brace (9) is a double-channel steel, arranged back to back, with the first connecting steel plate (11) and the second connecting steel plate (16) sandwiched in the middle.

10. A method for installing a bolted triangular support frame for cantilever slab construction according to any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1: Prefabricate the horizontal cantilever beam (1), diagonal brace (9) and embedded parts (10); Step 2: Before pouring concrete for the building structure floor slab, install the embedded parts (10) and anchoring mechanism; Step 3: Place the horizontal cantilever beam (1) on the floor slab (7) according to the position of the pre-embedded anchoring mechanism, so that the length of the cantilever section of the horizontal cantilever beam (1) meets the installation and operation space of the diagonal brace (9), connect the upper end of the diagonal brace (9) to the cantilever section of the horizontal cantilever beam (1) through the first connecting steel plate (11) and bolts, and connect the lower end of the diagonal brace (9) to the pre-embedded part (10) through the second connecting steel plate (16) and bolts; Step 4: Push the horizontal cantilever beam (1) connected with the diagonal brace (9) outward so that the horizontal cantilever beam (1) is in close contact with the structural floor slab (7), and then anchor the horizontal cantilever beam (1) through the anchoring mechanism; Step 5: Erect a formwork support frame on the cantilever section of the horizontal cantilever beam (1).

Images