Support structure and construction method of outwardly extended cantilever layer formwork
By using a support structure combining I-beams and Bailey bridge panels, the problems of high cost, significant safety risks, and structural quality in cantilever construction were solved, enabling efficient and safe cantilever construction and improving building quality and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA CONSTR THIRD ENG BUREAU GRP CO LTD
- Filing Date
- 2024-04-29
- Publication Date
- 2026-07-31
AI Technical Summary
In building construction, the construction of cantilever structures presents challenges such as high construction costs, significant safety risks, and difficulty in ensuring structural quality. This is especially true in the cantilever expansion construction of super high-rise buildings, where conventional methods are insufficient to effectively address the deformation and safety hazards of cantilever components.
The support structure adopts a combination of I-beams and Bailey bridge sections. The I-beams are fixed by pre-drilled holes and pre-embedded anchor rings. The high load-bearing capacity and small deformation characteristics of the Bailey bridge sections are utilized to form a frame structure with horizontal and vertical supports, which reduces the construction risk of the cantilever structure. The I-beams are used to bear the support force of the cantilevered Bailey bridge sections at the well opening, avoiding the impact of large openings.
It improves the construction efficiency and safety of cantilever structures, reduces construction costs, enhances the stability and load-bearing capacity of structures, avoids damage to shear walls, and improves construction quality.
Smart Images
Figure CN118517171B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of building engineering technology, and in particular to a support structure and construction method for an outwardly extended cantilevered formwork. Background Technology
[0002] In the field of architectural engineering, a large number of buildings are often designed as concrete structures due to functional or aesthetic needs, featuring a relatively small lower core tube structure and a larger, cantilevered outer structure. When constructing cantilevered structures, using ground-supported formwork significantly increases construction costs. For super high-rise cantilevered buildings, using ground-supported formwork can easily lead to scaffold instability and safety accidents. Conventional cantilevered I-beam formwork is insufficient to withstand the deformation of cantilevered components under heavy construction loads, easily causing safety accidents and quality problems. When using Bailey bridges with higher load-bearing capacity as cantilevered components, large temporary openings must be reserved in the side walls when the cantilevered components pass through elevator shafts, ventilation shafts, or other floor slabs. Excessively large temporary openings in the side walls will affect structural quality. Therefore, how to reduce the construction difficulty of fixing large cantilevered structures at shaft openings while ensuring construction quality and safety remains a significant construction challenge. Summary of the Invention
[0003] To overcome the shortcomings of the prior art, the present invention provides a support structure and construction method for an extended cantilevered layer formwork, which optimizes the construction method of cantilevered frame and inclined column formwork erection and reinforcement, thereby improving the construction efficiency of cantilevered structure inclined columns, improving construction quality, and reducing construction risks.
[0004] This invention is achieved through the following technical solutions: A support structure for an extended cantilevered floor formwork includes I-beams, Bailey bridge sections, horizontal supports, vertical supports, and several pre-drilled holes on the masonry sidewalls. The pre-drilled holes are located below the extended cantilevered floor. The tail of the I-beam passes through the pre-drilled holes and is fixed by embedded anchor rings located in the lower structural plane of the extended cantilevered floor. The Bailey bridge sections are fixed to the head of the I-beams by locking devices, and lateral connecting frames are provided between adjacent rows of Bailey bridge sections. The horizontal supports are fixed to adjacent rows of Bailey bridge sections. The bottom of the vertical supports is fixed to the horizontal supports. The top of the formwork supports the outwardly cantilevered components. In this technical solution, the support structure adopts a combination of I-beams and Bailey bridge sections for the construction of the outwardly cantilevered structure. This fully utilizes the characteristics of the cantilevered Bailey beams, such as large load capacity, small deformation, and convenient assembly and disassembly, which greatly improves the load-bearing capacity of the frame, enhances its stability, and reduces the construction risk of the cantilevered structure. Furthermore, the support structure uses the I-beams and the lower building structure to bear the supporting force of the rear support of the cantilevered Bailey bridge section at the well opening, avoiding the structural construction quality problems involved in reserving large openings in the shear wall for Bailey bridge sections.
[0005] Preferably, a horizontal connecting rod is provided between the vertical support members, and the vertical support members and the horizontal connecting rod form a frame structure. In this technical solution, the horizontal connecting rod and the vertical support members form a frame structure, which can improve the overall connection strength of the mold frame support structure and thus improve the reliability of the structure.
[0006] Preferably, the lateral support is a square steel pipe and the vertical support is a round steel pipe; the lateral support is provided with a positioning pin, which is adapted to the inner diameter of the vertical support; in this technical solution, the square steel pipe and the round steel pipe are simple to obtain, lightweight, and easy to handle, and the square steel pipe, as a lateral support, has strong bending resistance.
[0007] More preferably, the positioning pin is made of round steel; in this technical solution, the positioning pin is made of steel bar tailings that appear during on-site construction, and the steel bar used has a diameter of not less than 16mm and a length of not less than 200mm.
[0008] Preferably, a short steel shim is provided between the I-beam and the Bailey bridge section; in this technical solution, the short steel shim can raise the fixed position of the Bailey bridge section, so that the Bailey bridge section is at the same height as the existing masonry, thereby improving the stress condition of the Bailey bridge section and facilitating the fixing of the Bailey bridge section.
[0009] More preferably, the raised short steel is a square steel pipe; the raised short steel is fixed to the I-beam by bolt connection; in this technical solution, the raised short steel adopts a detachable bolt connection method, which can facilitate subsequent disassembly and replacement, so that the material can be reused and provide economic efficiency.
[0010] Preferably, the top support includes a base and a screw. The base has a threaded hole in the middle for the screw and a positioning groove at the bottom for the vertical support rod. The threaded hole communicates with the positioning groove. The screw is threaded into the threaded hole and has a support plate at the top. In this technical solution, the screw can be adjusted in height on the base to compensate for the height of the vertical support rod, thus facilitating the support of the mold frame.
[0011] A construction method for a formwork support structure based on the aforementioned outwardly cantilevered member, comprising the following steps: In this technical solution, S1. Installation of reserved holes and embedded anchor rings: When pouring the lower layer of masonry for the outwardly expanded cantilevered component, a self-made wooden box is pre-embedded on the side wall of the masonry to set reserved holes, and anchor rings are pre-embedded in the lower structural plane layer of the outwardly expanded cantilevered component. S2. I-beam installation: After passing the I-beam through the reserved hole, fix the base with anchor rings; S3. Installation of cantilevered Bailey panels: Use lifting equipment to hoist the Bailey panels to the designated position, insert them into the support anchor rings on the I-beams, and use perforated angle steel or rectangular tubes to press down the lower chord of the Bailey panel and tighten them with nuts. After the front and rear supports of the Bailey panel are fixed, loosen the lifting ropes and then proceed with the assembly of the subsequent Bailey panels; use lateral connecting frames to fix adjacent rows of Bailey panels. S4. Installation of transverse support rods: The transverse support rods are welded and fixed to the cantilevered Bailey panels. The position and quantity are determined according to the arrangement of the vertical support rod tubes of the formwork frame. S5. Formwork erection: Weld positioning pins to the upper part of the horizontal support rods. The positioning pins are made from the steel bar tailings that appear during on-site construction. Insert the vertical support steel pipes into the positioning pins and set a top support at the top of the vertical support to support the formwork of the outwardly expanding cantilevered components.
[0012] The beneficial effects of this invention are as follows: 1. High construction efficiency and high economic benefits: The cantilevered Bailey panel structure is simple, easy to transport, quick to erect, easy to disassemble and assemble, has good interchangeability and strong adaptability, does not damage the Bailey beam during construction, and can be reused; the large cantilevered Bailey panel formwork system is formed by conventional lateral connection frames, support anchor rings, I-beams, steel pipe frames, standard fasteners and steel bar tailings, all of which can be used as reusable materials, improving economic efficiency; 2. Strong load-bearing capacity, effectively reducing construction wind Risk: The cantilevered frame has a large load-bearing capacity and small deformation. Using the cantilevered Bailey panels as cantilever load-bearing components can improve the load-bearing capacity of the frame, enhance stability, and reduce construction risks; 3. High operability and minimal damage to the original structure: The construction method of fixing the rear support of the large cantilevered Bailey panel in the narrow space well hole has low construction technical difficulty, is easy to erect, has strong load-bearing capacity, and small deformation. The use of I-beams through the reserved small opening to transfer the load of the rear support of the large cantilevered Bailey panel significantly reduces the construction risks of the reserved large opening in the shear wall. Attached Figure Description
[0013] Figure 1 This is a plan view of the support structure of an outwardly cantilevered formwork frame as described in Embodiment 1; Figure 2 This is a cross-sectional schematic diagram of the support structure of an outwardly cantilevered formwork frame as described in Embodiment 1; Figure 3 This is a schematic diagram of the top support structure described in Embodiment 1; Figure 4 This is a plan view of the support structure of an outwardly cantilevered formwork frame as described in Embodiment 3; Figure 5 This is a cross-sectional schematic diagram of the support structure of an outwardly cantilevered layer formwork as described in Embodiment 3; In the diagram: 1. Bailey bridge sheet; 2. Lateral connecting frame; 3. Horizontal support rod; 4. Anchor ring; 5. I-beam; 6. Vertical support rod; 7. Horizontal connecting rod; 8. Top support; 81. Base; 811. Threaded hole; 812. Positioning groove; 82. Screw; 83. Support plate; 9. Short steel pad; 10. Positioning pin; 11. Formwork; 12. Structural plane layer; 13. Reserved hole; 14. Masonry; 15. Existing extended cantilever component. Detailed Implementation
[0014] The technical solutions of various 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. Example
[0015] like Figures 1-3 As shown, a support structure for an extended cantilevered layer formwork includes an I-beam 5, Bailey bridge panels 1, transverse supports 3, vertical supports 6, and several pre-drilled holes 13 on the sidewall of the masonry 14. The pre-drilled holes 13 are located below the extended cantilevered layer. The tail of the I-beam 5 passes through the pre-drilled holes 13 and is fixed by embedded anchor rings 4 on the lower structural plane layer 12 of the extended cantilevered layer. The Bailey bridge panels 1 are fixed to the head of the I-beam 5 by the anchor rings 4, and a lateral connecting frame 2 is provided between adjacent rows of Bailey bridge panels 5. Several transverse supports 3 are parallelly fixed to adjacent supports by bolts. The vertical support 6 is fixed at the bottom to the horizontal support 2, and the top supports the formwork 11 of the outward cantilever component through the top support 8. The support structure adopts the form of combining I-beams 5 and Bailey panels 1 for the construction of the outward cantilever structure. It makes full use of the characteristics of the cantilever Bailey beam, such as large load capacity, small deformation, and convenient assembly and disassembly. It can improve the load-bearing capacity of the frame, enhance the stability performance, reduce the construction risk of the cantilever structure, and make the I-beams bear the support force of the rear end of the cantilever Bailey panel at the well opening. It avoids the structural construction quality problem caused by leaving a large opening in the shear wall to pass through the Bailey panel.
[0016] Preferably, a horizontal connecting rod 7 is provided between the vertical support members 6, and the horizontal connecting rod 7 and the vertical support member 6 can form a frame structure to improve the reliability of the structure. Specifically, the horizontal support member 3 is a square steel pipe, and the vertical support member 6 is a round steel pipe. The square and round steel pipes are simple to obtain, lightweight, and easy to handle. Moreover, the square steel pipe, as a horizontal support member, has strong bending resistance. The horizontal support member is provided with a positioning pin, which is adapted to the inner diameter of the vertical support member. The positioning pin can be made from the steel bar tailings that appear during on-site construction, and the diameter of the steel bar used is not less than [missing information]. The top support 8 has a diameter of 16mm and a length of not less than 200mm. It includes a base 81 and a screw 82. The base 81 has a threaded hole 811 in the middle for the screw and a positioning groove 812 at the bottom for the vertical support rod 6. The threaded hole 811 communicates with the positioning groove 812. The screw is threaded into the threaded hole 811, and a support plate 83 is provided at the top of the screw. The positioning groove 812 allows the vertical support rod 6 to be easily inserted and positioned. The screw 82 can be adjusted in height on the base 81 to compensate for the height of the vertical support rod 6, facilitating support for the mold frame 11 and improving its applicability. Example
[0017] like Figures 1-3 As shown, a construction method for a formwork support structure based on the cantilevered member in the above embodiments includes the following steps: S1. Installation of reserved holes and embedded anchor rings: When pouring the lower masonry 14 of the outwardly expanded cantilevered component, a self-made wooden box is pre-embedded on the side wall of the masonry 14 to set the reserved hole 13, and an anchor ring 4 is pre-embedded in the lower structural plane layer 12 of the outwardly expanded cantilevered component. S2. Distribute the installation of I-beams: After passing the I-beam 5 through the reserved hole 13, fix the root with the pre-embedded anchor ring 4; S3. Installation of cantilevered Bailey panels: Use lifting equipment to hoist Bailey panel 1 to the designated position, insert it into the support anchor ring 4 on the I-beam 5, use perforated angle steel or rectangular tube to press down the lower chord of the Bailey panel, and then tighten it with nuts. After the front and rear supports of the Bailey panel are fixed, loosen the lifting ropes and then proceed with the assembly of the subsequent Bailey panels; use lateral connecting frames 2 to fix adjacent rows of Bailey panels. S4. Installation of transverse support rods: The transverse support rods 3 are fixed to the cantilevered Bailey panels by bolts. The position and number are determined according to the arrangement of the vertical support rod tubes 6. S5. Formwork erection: Weld positioning pins 10 to the upper part of the horizontal support rod 3. The positioning pins 10 are made from the steel bar tails that appear during on-site construction. Insert the vertical support steel pipe 6 into the positioning pins 10 and set the top support 8 at the top of the vertical support to support the formwork 11 of the outwardly expanding cantilevered component. Example
[0018] like Figures 4-5 As shown, a construction method for a formwork support structure based on the cantilevered member in the above embodiments includes the following steps: S1. Installation of reserved holes and embedded anchor rings: When pouring the lower masonry 14 of the outwardly expanded cantilevered component, a self-made wooden box is pre-embedded on the side wall of the masonry 14 to set the reserved hole 13, and an anchor ring 4 is pre-embedded in the lower structural plane layer 12 of the outwardly expanded cantilevered component. S2. I-beam installation: After the I-beam 5 passes through the reserved hole 13, the root is fixed by the pre-embedded anchor ring 4; after the I-beam 5 passes through the reserved hole 13, a short steel 9 is fixed at the head by bolt connection. The short steel 9 raises the fixed position of the Bailey panel 1 so that the Bailey panel is at the same height as the existing outward cantilever component 15. S3. Installation of cantilevered Bailey panels: Bailey panel 1 is hoisted to the designated position using lifting equipment and inserted into the support anchor ring 4 on the I-beam 5. The lower chord of the Bailey panel is then pressed down with perforated angle steel or rectangular tube and tightened with nuts. After the front and rear supports of the Bailey panel are fixed, the lifting ropes are released before assembling the subsequent Bailey panels. Anchor rings for fixing Bailey panels are provided on the outwardly extended cantilever component 15. Adjacent rows of Bailey panels are fixed by lateral connecting frames 2. S4. Installation of transverse support rods: The transverse support rods 3 are fixed to the cantilevered Bailey panels by bolts. The position and number are determined according to the arrangement of the vertical support rod tubes 6. S5. Formwork erection: Weld positioning pins 10 to the upper part of the horizontal support rod 3. The positioning pins 10 are made from the steel bar tails that appear during on-site construction. Insert the vertical support steel pipe 6 into the positioning pins 10 and set the top support 8 at the top of the vertical support to support the formwork 11 of the outwardly expanding cantilevered component.
[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of the present invention.
Claims
1. A support structure for an outriggered cantilevered floor formwork, characterized by, It includes I-beams, Bailey bridge sections, horizontal supports, vertical supports, and several pre-drilled holes on the masonry sidewalls; the pre-drilled holes are located below the extended cantilever layer; the tail of the I-beam passes through the pre-drilled holes and is fixed by pre-embedded anchor rings located in the lower structural plane layer of the extended cantilever layer; the Bailey bridge sections are fixed to the head of the I-beams by locking devices, and a lateral connecting frame is provided between two adjacent rows of Bailey bridge sections; the horizontal supports are fixed on two adjacent rows of Bailey bridge sections; the bottom of the vertical supports is fixed to the horizontal supports, and the top supports the formwork of the extended cantilever components through a top support.
2. The support structure of an outrigger cantilever story formwork according to claim 1, wherein, A horizontal connecting rod is provided between the vertical support members, and the vertical support members and the horizontal connecting rod form a frame structure.
3. The support structure of an overhanging cantilever floor formwork according to claim 1, wherein, The horizontal support is a square steel pipe, and the vertical support is a round steel pipe; the horizontal support is provided with a positioning pin, which is adapted to the inner diameter of the vertical support.
4. The support structure of a cantilevered outrigger formwork according to claim 3, wherein, The positioning pin is made of round steel.
5. The support structure of the cantilevered formwork frame according to claim 1, characterized in that, A short steel bar is provided between the I-beam and the Bailey sheet to elevate it.
6. The support structure of an overhanging cantilever floor formwork according to claim 5, wherein, The raised short steel is a square steel pipe; the raised short steel is fixed to the I-beam by bolt connection.
7. The support structure of an overhanging cantilever story formwork according to claim 1, wherein, The top support includes a base and a screw. The base has a threaded hole in the middle that is adapted to the screw and a positioning groove at the bottom that is adapted to the vertical support rod. The threaded hole is connected to the positioning groove. The screw is threaded into the threaded hole and has a support plate at the top.
8. A method of constructing a support structure of an outrigger cantilever formwork according to any one of claims 1 to 7, characterized in that, The specific steps are as follows: S1. Installation of reserved holes and embedded anchor rings: When pouring the lower layer of masonry for the outwardly expanded cantilevered component, a self-made wooden box is pre-embedded on the side wall of the masonry to set reserved holes, and an anchor ring is pre-embedded in the lower structural plane layer of the outwardly expanded cantilevered component. S2. I-beam installation: After passing the I-beam through the reserved hole, fix the base with anchor rings; S3. Installation of cantilevered Bailey panels: Use lifting equipment to hoist the Bailey panels to the designated position, insert them into the support anchor rings on the I-beams, and use perforated angle steel or rectangular tubes to press down the lower chord of the Bailey panel and tighten them with nuts. After the front and rear supports of the Bailey panel are fixed, loosen the lifting ropes and then proceed with the assembly of the subsequent Bailey panels; use lateral connecting frames to fix adjacent rows of Bailey panels. S4. Installation of transverse support rod: The transverse support rod is fixed to the cantilevered Bailey panel by bolts; S5. Formwork erection: Weld positioning pins to the upper part of the horizontal support rods. The positioning pins are made from the steel bar tailings that appear during on-site construction. Insert the vertical support steel pipes into the positioning pins and set a top support at the top of the vertical support to support the formwork of the outwardly expanding cantilevered components.