A center post mounted, turnable overhanging guard

Abstract

The application relates to the technical field of building construction safety protection, and discloses a center column installation turnover cantilever protection device, which comprises steel belts, angle steels, square steel pipes, bolts, round steel pipes and steel sheet nets, wherein the steel belts are arranged in a plurality of strips, are fixed in a hoop around the outer wall of the center column, and are connected into a hoop clamp through the bolts at the two ends; the angle steels serve as main cantilever beams, the vertical limbs of the angle steels are connected with the steel belts through the bolts, and the horizontal limbs of the angle steels are extended to form a cantilever platform; the square steel pipes are connected at the end portions of the horizontal limbs of the angle steels and form an annular outer frame with the adjacent angle steels; the round steel pipes are arranged in a hoop to form a horizontal support system; and the steel sheet nets are laid on the platform surface as a bottom plate for the walking and material placing of workers. The application can provide a working platform and falling protection device which are directly fixed on the installed center column segment, and solve the problems of high cost, slow erection, high risk in the air and poor turnover in the prior art.

Description

Technical Field

[0001] This invention relates to the field of building construction safety protection technology, specifically a reusable cantilevered protective device for installing a central column. Background Technology

[0002] With the rapid development of my country's warehousing industry, the number of large-diameter silos (such as grain silos and cement clinker silos) being built is increasing daily. In the construction of silo roofs, the central column-Bailey bridge support system has become one of the mainstream construction methods due to its high load-bearing capacity, good stability, and flexible erection. In this system, the central column, as the core vertical support component, is usually composed of multiple steel columns connected by flange bolts, requiring section-by-section installation and fixing at high altitude.

[0003] Currently, traditional central column installation construction commonly uses coupler-type steel pipe scaffolding to erect operating platforms. Workers need to erect full-span or independent scaffolding from the ground to the height of the central column connection node, and then perform bolt tightening operations on the platform. This construction method has the following prominent problems: high cost, with high rental costs for scaffolding components and accessories, and a large amount of manpower required for erection and dismantling. When constructing multiple silos sequentially, the scaffolding needs to be repeatedly erected and dismantled, resulting in high amortized costs. Slow erection, as the height of the central column increases, the scaffolding erection period becomes longer, affecting the overall construction progress. High safety risks, as workers are always in a state of near-edge or unprotected condition during the high-altitude scaffolding erection process, and there are often gaps between the scaffolding and the central column, resulting in a high risk of falls. Poor reusability, as the scaffolding must be completely dismantled after each silo is completed before the next silo is re-erected, making efficient reuse impossible. Therefore, there is an urgent need for a central column installation auxiliary protection device that can be quickly installed, is safe and reliable, and can be reused. Summary of the Invention

[0004] The purpose of this invention is to provide a reusable cantilevered protective device for central column installation, applicable to engineering fields such as grain silos, cement silos, and coal silos where the central column-Bailey bridge support system is used for the construction of silo roofs. It provides a device that can be directly fixed to an installed central column segment, providing a working platform and fall protection for the connection of the previous column segment, thereby solving the problems of high cost, slow erection, high risk at height, and poor reusability in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A reusable cantilevered protective device for central column installation includes steel strips, angle steel, square steel pipes, bolts, round steel pipes, and steel mesh, wherein: Several steel strips are provided and tightly fixed along the outer wall of the central column. The two ends of the steel strips are connected to form a ring-shaped clamp by bolts. Each steel strip has a connecting lug pre-welded or has connecting holes. The number of steel strips is determined according to the diameter of the central column, usually no less than two, and each steel strip is 50 to 100 mm wide, 4 to 8 mm thick, and made of Q235B or higher strength steel.

[0006] The angle steel serves as the main cantilever beam, with its vertical limbs connected to the lugs on the steel strip via bolts or directly to the openings on the steel strip, and its horizontal limbs extending outwards to form a cantilever platform for carrying workers and materials.

[0007] The square steel tube is welded or bolted to the horizontal end of the angle steel, forming an annular outer frame with the adjacent angle steel, which strengthens the overall structural strength.

[0008] The circular steel pipes are arranged circumferentially, and their two ends are connected to adjacent angle steel or square steel pipes to form a horizontal support system, which enhances the overall stability and rigidity of the platform.

[0009] The steel plate mesh is laid on the annular platform surface formed by angle steel, square steel pipe and round steel pipe. It adopts a diamond mesh with a diameter of 30 mm by 30 mm and a thickness of not less than 3 mm. It has the functions of anti-slip and preventing small tools from falling. It serves as a base for workers to walk and for temporary placement of materials.

[0010] Preferably, to enhance the stability of the cantilever platform, a diagonal brace is installed below the cantilever section of the angle steel. One end of the diagonal brace is connected to the lower part of the steel strip, and the other end is connected to the far end of the horizontal leg of the angle steel. The horizontal load is effectively resisted through the principle of triangular stability structure.

[0011] Preferably, to facilitate reuse, all connections are made with high-strength bolts to avoid on-site welding. This allows the steel strips, angle steel, square steel pipes, and round steel pipes to be disassembled and reused in different central column segments or different silos, significantly reducing construction costs.

[0012] Preferably, a temporary guardrail with a height of not less than one meter is formed by inserting or binding round steel pipes around the platform to provide effective safety protection for workers at height and prevent falls.

[0013] Preferably, the spacing between two adjacent steel strips is determined according to the diameter of the central column and the load-bearing requirements, usually one to one and a half meters, to ensure that the clamping force of the steel strip on the column body is evenly distributed and to prevent excessive local stress from causing deformation or failure.

[0014] Preferably, the angle steel is evenly distributed around the column, usually eight to twelve, and the spacing between adjacent angle steel is kept within a reasonable range to ensure the platform's load-bearing capacity and structural stability.

[0015] Preferably, the connection between the square steel tube and the angle steel is fixed with double bolts, and at least two high-strength bolts are provided at each connection point to enhance the shear resistance and reliability of the connection node.

[0016] Preferably, when round steel pipes are used as horizontal supports, their diameter and wall thickness are selected according to the platform's load-bearing requirements. Typically, standard steel pipes with a diameter of 48 mm and a wall thickness of 3.5 mm are used, which both meet the strength requirements and reduce the overall weight.

[0017] Preferably, the steel mesh is fixed to the angle steel and square steel pipe by self-tapping screws or wire binding, with an overlap of not less than 50 mm at the joints, to ensure that the platform surface is flat and without warping, and to prevent people from tripping or twisting their ankles when walking.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. The central column is equipped with a reusable cantilevered protective device. This device, consisting of steel straps, angle steel, square steel pipes, bolts, round steel pipes, and steel mesh, is fixed to the central column. It directly utilizes the already installed central column segment as a support foundation, eliminating the need for external full-span scaffolding or independent scaffolding. This significantly reduces the rental costs of scaffolding components and accessories, while also reducing labor costs associated with erection and dismantling. For scenarios involving the sequential construction of multiple silos, the protective device can be assembled, disassembled, and reused repeatedly, resulting in a substantial reduction in amortization costs. The steel straps are tightly secured around the circumference of the central column, and the angle steel extends outwards as a cantilever beam to form an operating platform. The entire installation of the device only requires installation on the already installed column segment. The bolted connection method allows for rapid installation and dismantling. Compared to traditional scaffolding methods, this significantly shortens the construction cycle and effectively accelerates the overall construction progress. Workers directly tighten the bolts of the previous central column on the cantilevered platform. Temporary guardrails around the platform provide effective safety protection for workers at height, avoiding the risks associated with traditional scaffolding where workers are constantly near edges or without protection. The gap between the scaffolding and the central column is also fundamentally resolved, significantly reducing the risk of falls. The device uses a fully bolted connection design, and all components can be disassembled and installed. After the central column of one silo is installed, the entire device can be dismantled and transferred to the next silo for continued use, eliminating the need for re-purchase or re-erecting. This achieves efficient reuse and significantly improves equipment utilization and economic efficiency compared to the traditional method of dismantling and rebuilding scaffolding after each silo installation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the platform structure of the present invention; Figure 3 This is a side view structural diagram according to an embodiment of this application.

[0020] The components include: 1. steel strip; 2. angle steel; 3. square steel pipe; 4. bolts; 5. round steel pipe; 6. steel mesh; 7. diagonal bracing; 8. temporary guardrail; 9. connecting ear plate; 10. platform surface. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1 to 3 This invention provides a reusable cantilevered protective device for central column installation. This device is applied to safety protection in the construction of warehouse-type building structures, and is particularly suitable for projects such as grain silos, cement silos, and coal silos where the roof is constructed using a central column-Bailey bridge support system. The device can be directly fixed to an already installed central column segment, providing a working platform and fall protection for connecting the previous column segment. This effectively solves the problems of high cost, slow erection, high risk at heights, and poor reusability in existing technologies.

[0023] Please see Figure 1 and Figure 2 Several steel strips 1 are provided and tightly fixed along the outer circumference of the central column. The two ends of the steel strips 1 are connected by bolts 4 to form a ring-shaped clamp. In this embodiment, the steel strips 1 are evenly arranged along the circumference of the central column. The number of steel strips 1 is determined according to the diameter of the central column, and is usually no less than two. The width of the steel strips 1 is fifty to one hundred millimeters, the thickness is four to eight millimeters, and the material is Q235B or higher strength steel, with sufficient tensile strength and durability. Each steel strip 1 is pre-welded with a connecting lug 9 or has a connecting hole. The connecting lug 9 and the steel strip 1 are connected by full welding, and the weld height meets the requirements of relevant steel structure construction specifications. In this embodiment, the connecting lug 9 is preferred. The connecting lug 9 is eight millimeters thick, forty millimeters wide, and sixty millimeters high. A circular hole with a diameter of twenty-two millimeters is opened in the middle of the connecting lug 9 for the bolts 4 to pass through. The spacing between two adjacent steel strips 1 is determined based on the diameter of the central column and the load-bearing requirements, typically ranging from one to 1.5 meters. This ensures that the clamping force of the steel strips 1 on the column is evenly distributed, preventing excessive local stress that could lead to deformation or failure. The steel strips 1 are made from rolled material and are cut to size on-site according to the actual circumference of the central column. Then, the two ends of the steel strips 1 are connected and fastened using bolts 4, forming a ring structure tightly clamped to the outer wall of the central column.

[0024] Please see Figure 1 , Figure 2 and Figure 3 Angle steel 2 serves as the main cantilever beam of the cantilever protection device. Its vertical leg is connected to the connecting lug 9 on the steel strip 1 via bolts 4 or directly to the opening on the steel strip 1. Its horizontal leg extends outwards, forming a cantilever platform for supporting workers and materials. In this embodiment, angle steel 2 is an equilateral angle steel, model L50×50×5, material Q235B. The height of the vertical leg of angle steel 2 is determined according to the installation position of the steel strip 1 and the load-bearing requirements of the platform, typically 200 to 300 mm. The length of the horizontal leg of angle steel 2 is determined according to the width requirements of the cantilever platform, typically 600 to 1000 mm. At the connection position between the vertical leg of angle steel 2 and the connecting lug 9, two high-strength bolts 4 are used for connection. The bolts 4 are model M20, performance grade 10.9. The bolts 4 pass through the bolt holes on the vertical leg of angle steel 2 and the round holes on the connecting lug 9, and are fastened with nuts and washers. Angle steel 2 is evenly distributed around the column, typically eight to twelve pieces. The spacing between adjacent angle steel 2 is maintained within a reasonable range to ensure the platform's load-bearing capacity and structural stability. In this embodiment, ten angle steel 2 are preferably arranged at equal intervals, with a center angle of thirty-six degrees between adjacent angle steel 2. A connecting flange is provided at the horizontal end of the angle steel 2, and bolt holes are provided on the flange for connection to the square steel pipe 3.

[0025] Please see Figure 1 and Figure 3 The square steel pipe 3 is welded or bolted to the horizontal end of the angle steel 2, forming an annular outer frame with the adjacent angle steel 2, which strengthens the overall structural strength. In this embodiment, the cross-sectional dimensions of the square steel pipe 3 are 80×80×4, and the material is Q235B. The length of the square steel pipe 3 is determined according to the arc length between two adjacent angle steels 2. At the horizontal end of the angle steel 2, the flange is connected to the end flange of the square steel pipe 3 with double bolts. At least two high-strength bolts 4 are provided at each connection point to enhance the shear resistance and reliability of the connection node. The square steel pipe 3 is arranged circumferentially along the platform to form a closed annular frame structure, which effectively enhances the overall rigidity and deformation resistance of the platform. The connection between the square steel pipe 3 and the angle steel 2 adopts a combination of butt welds and bolts. The weld quality grade is level two, and the weld height is not less than 0.7 times the thickness of the thinner component.

[0026] Please see Figure 1 and Figure 3The round steel pipes 5 are arranged circumferentially, with both ends connected to adjacent angle steel 2 or square steel pipes 3, forming a horizontal support system to enhance the overall stability and rigidity of the platform. In this embodiment, when the round steel pipes 5 serve as horizontal supports, their diameter and wall thickness are selected according to the platform's load-bearing requirements. Standard steel pipes with a diameter of 48 mm and a wall thickness of 3.5 mm are used, which meets the strength requirements while reducing the overall weight. Multiple layers of round steel pipes 5 are arranged radially and circumferentially along the platform surface, forming a grid-like horizontal support system. At both ends of the round steel pipes 5, they are connected to the angle steel 2 or square steel pipes 3 using pipe clamps or direct welding. The round steel pipes 5 are connected to the angle steel 2 and square steel pipes 3 by welding or bolting. Connecting plates are provided at the connection nodes, and the connecting plates are connected to each component using double-sided fillet welds with a weld height of 4 mm.

[0027] Please see Figure 1 and Figure 3 Steel mesh 6 is laid on the annular platform formed by angle steel 2, square steel pipe 3, and round steel pipe 5, serving as a base for workers to walk on and for temporary material placement. In this embodiment, steel mesh 6 uses a 30mm x 30mm diamond-shaped mesh, with a thickness of not less than 3mm, and is made of Q235B low-carbon steel. Steel mesh 6 has anti-slip properties and prevents small tools from falling. The mesh size of steel mesh 6 effectively prevents small objects such as nuts and bolts from falling through the mesh, while ensuring good anti-slip effect for workers walking on it. Steel mesh 6 is fixed to angle steel 2 and square steel pipe 3 using self-tapping screws or wire binding, with an overlap of not less than 50mm at the joints, ensuring the platform surface is flat and without warping, preventing tripping or spraining of the ankles when walking on it. In this embodiment, steel mesh 6 is fixed using wire with a diameter of 4mm, with a binding spacing of not more than 100mm. The edges of steel mesh 6 are fixed to angle steel 2 and square steel pipe 3 by spot welding, with a spot welding spacing of 200mm. Platform surface 10 is the flat working surface formed by steel mesh 6, angle steel 2, square steel pipe 3, and round steel pipe 5.

[0028] Please see Figure 1 and Figure 3The diagonal brace 7 is positioned below the cantilever section of the angle steel 2, with one end connected to the lower part of the steel strip 1 and the other end connected to the distal end of the horizontal leg of the angle steel 2. It effectively resists horizontal loads through the principle of triangular stability. In this embodiment, the diagonal brace 7 is made of Q235B steel pipe with a diameter of 33 mm and a wall thickness of 3.5 mm. The connection between the diagonal brace 7 and the steel strip 1 uses a clamp-type connector. The clamp is fixed to the steel strip 1 by bolts 4, and the end of the diagonal brace 7 is inserted into the clamp and hinged through a connecting pin. The connection between the diagonal brace 7 and the distal end of the horizontal leg of the angle steel 2 is a welded connection, with a double-sided fillet weld and a weld height of 3 mm. The setting angle of the diagonal brace 7 is determined according to the cantilever length of the platform and the load-bearing requirements, typically with an angle of 45 to 60 degrees to the horizontal plane. This triangular stability structure effectively enhances the overturning resistance and overall stability of the cantilever platform.

[0029] Please see Figure 1 and Figure 3 Temporary guardrail 8 is installed around the platform perimeter, using round steel pipes 5 connected or tied together to form a temporary guardrail with a height of no less than one meter, providing effective safety protection for workers at height and preventing fall accidents. In this embodiment, the temporary guardrail 8 includes uprights and crossbars. The uprights are made of round steel pipes 5 with a diameter of 48 mm and a wall thickness of 3.5 mm, and the height of the uprights is 1100 mm. The lower end of the upright is welded to the vertical components below the platform surface. There are two crossbars: an upper crossbar with a height of 600 mm and a middle crossbar with a height of 400 mm. The crossbars are made of round steel pipes 5 with a diameter of 33 mm and a wall thickness of 3.5 mm. The uprights and crossbars are connected by a socket joint, with the crossbar inserted into the pre-set holes in the uprights and fixed by positioning pins. The top of the temporary guardrail 8 is equipped with a protective cap to prevent rainwater from seeping in and causing corrosion. The temporary guardrail 8 effectively ensures the safety of workers at height and prevents people from falling from the edge of the platform.

[0030] The installation process and working principle of the center column-mounted reusable cantilevered protective device provided in this embodiment of the invention are as follows: During installation, the steel strip 1 is first wrapped and fixed to the installed central column segment. Based on the diameter of the central column and on-site measurements, a suitable length of steel strip 1 is selected. After wrapping the steel strip 1 around the outer wall of the central column once, the two ends overlap, and then the two ends of the steel strip 1 are connected and tightened with bolts 4 to form a ring clamp. Connecting ear plates 9 are pre-welded to the outer surface of the steel strip 1, and the position of the connecting ear plates 9 is determined according to the installation position of the angle steel 2. In this embodiment, the connecting ear plates 9 are located in the middle of the steel strip 1, with one connecting ear plate 9 corresponding to each angle steel 2.

[0031] Then install angle steel 2. Align the vertical leg of angle steel 2 with the connecting lug 9, aligning the bolt holes with the round holes on the connecting lug 9, insert the bolts 4, and tighten with nuts. The horizontal leg of angle steel 2 extends outwards, forming the foundation structure of the cantilever platform. At the connection between the vertical leg of angle steel 2 and the connecting lug 9, use two M20 high-strength bolts 4 with double nuts for double tightening, ensuring that the connection node has sufficient preload and shear resistance.

[0032] Next, install the square steel pipe 3. Align the end flange of the square steel pipe 3 with the flange at the horizontal end of the angle steel 2, insert the bolts 4, and tighten them. The square steel pipes 3 are connected sequentially along the circumference of the platform, and adjacent square steel pipes 3 are connected by flanges and bolts to form a closed annular outer frame. The connection nodes between the square steel pipe 3 and the angle steel 2 are fixed with double bolts, and each node is equipped with four M16 high-strength bolts 4.

[0033] Then, install the round steel pipe 5 as a horizontal support. The round steel pipe 5 is arranged radially and circumferentially along the platform surface, and its two ends are connected to the angle steel 2 or square steel pipe 3 by welding or bolting. The round steel pipe 5 is connected to the angle steel 2 and square steel pipe 3 by connecting plates. The connecting plates are connected to each component by double-sided fillet welds with a weld height of four millimeters.

[0034] After installation, lay the steel mesh 6 on the platform surface. Cut the steel mesh 6 to the actual dimensions of the platform surface, ensuring that the seams overlap by at least 50 mm during laying to guarantee a flat and warped platform surface. Secure the steel mesh 6 to the angle steel 2 and square steel pipe 3 with wire, with a binding spacing of no more than 100 mm.

[0035] A diagonal brace 7 is installed below the cantilever section of angle steel 2. One end of the diagonal brace 7 is connected to the steel strip 1 via a clamp, and the other end is welded to the far end of the horizontal leg of angle steel 2. The setting angle of the diagonal brace 7 is determined according to the cantilever length of the platform and the load-bearing requirements. In this embodiment, the angle between the diagonal brace 7 and the horizontal plane is fifty degrees, which effectively enhances the overall stability of the platform through the triangular stabilizing structure.

[0036] Finally, install temporary guardrail 8. The posts of temporary guardrail 8 are fixed to the components below the platform surface by welding or bolting, and the crossbars are connected to the posts by a socket joint. The height of temporary guardrail 8 is not less than one meter, which can effectively prevent workers from falling from the edge of the platform.

[0037] The working process of the center column mounting reusable cantilever protection device provided in this embodiment of the invention is as follows: During operation, workers reach the height of the protective device via a ladder or lifting device installed inside the central column, and then enter the cantilever platform from platform surface 10. Standing on platform surface 10 formed by the steel mesh 6, workers perform tasks such as bolt tightening, welding, and alignment of the previous section of the central column. The diamond-shaped mesh of the steel mesh 6 has an anti-slip function, ensuring worker safety and preventing small tools such as nuts and bolts from falling through the mesh. The temporary guardrail 8 provides a safe boundary for workers, effectively preventing falls.

[0038] The diagonal brace 7 effectively resists horizontal loads through its triangular stabilizing structure, ensuring that the cantilever platform does not overturn or deform excessively when bearing the weight of workers and materials. The annular outer frame formed by the square steel tube 3 and the horizontal support system composed of the round steel tube 5 together enhance the overall rigidity and stability of the platform.

[0039] After the installation of the central column in one segment is completed, the protective device can be completely removed and transferred to the next central column segment or the next silo for continued use. Because all connections are made with high-strength bolts, on-site welding is avoided. This allows the steel strip 1, angle steel 2, square steel pipe 3, round steel pipe 5, steel mesh 6, diagonal bracing 7, and temporary guardrail 8 to be disassembled and reused in the construction of different central column segments or different silos, significantly reducing construction costs.

[0040] In this embodiment of the invention, angle steel 2 is evenly distributed around the perimeter of the column, preferably ten angle steel 2 are arranged at equal intervals. The square steel pipe 3 is fixed to the angle steel 2 with double bolts, and four M16 high-strength bolts 4 are set at each connection point. The round steel pipe 5 is a standard steel pipe with a diameter of 48 mm and a wall thickness of 3.5 mm. The steel mesh 6 uses a diamond mesh with a diameter of 30 mm by 30 mm and a thickness of 3 mm. The overlap at the joints is not less than 50 mm, and it is fixed with iron wire with a diameter of 4 mm and a binding interval of not more than 100 mm. The height of the temporary guardrail 8 is 1100 mm. The posts are made of round steel pipe 5 with a diameter of 48 mm and a wall thickness of 3.5 mm. There are two horizontal bars, namely an upper horizontal bar with a height of 600 mm and a middle horizontal bar with a height of 400 mm.

[0041] The reusable cantilevered protective device for installing a central column provided in this embodiment of the invention utilizes the already installed central column segment as a supporting foundation. This eliminates the need for external full-span scaffolding or independent scaffolding, significantly reducing the rental costs of scaffolding components and accessories, and also reducing labor costs associated with erection and dismantling. The steel band 1 is tightly secured around the central column, and the angle steel 2 extends outward as a cantilever beam to form an operating platform. Installation of the entire device can be carried out solely on the already installed column segment. The bolted connection method allows for rapid installation and dismantling, drastically shortening the construction cycle and effectively accelerating the overall construction progress compared to traditional scaffolding methods. Workers can directly tighten the bolts of the previous central column segment on the cantilevered platform. Temporary guardrails around the platform provide effective safety protection for workers at height, avoiding the risk of workers being constantly on the edge or without protection during traditional scaffolding erection. The device adopts a fully bolted connection design, and all components can be disassembled and installed. After the central column of one silo is installed, the entire device can be dismantled and transferred to the next silo for continued use, thus achieving the goal of efficient turnover and utilization.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A reusable cantilevered protective device with a central column mounting, characterized in that: It includes steel strip (1), angle steel (2), square steel pipe (3), bolts (4), round steel pipe (5) and steel mesh (6), wherein: Several steel strips (1) are provided and are tightly fixed around the outer wall of the central column. The two ends of the steel strips (1) are connected to form a ring clamp by the bolts (4). Each steel strip (1) is pre-welded with a connecting ear plate (9) or has a connecting hole. The angle steel (2) serves as a cantilever beam, with its vertical limb connected to the connecting lug (9) on the steel strip (1) via bolts (4) or directly to the opening on the steel strip (1), and its horizontal limb extending outward to form a cantilever platform for carrying workers and materials. The square steel tube (3) is connected to the horizontal end of the angle steel (2) and forms an annular outer frame with the adjacent angle steel (2); The round steel pipe (5) is arranged circumferentially, and its two ends are respectively connected to the adjacent angle steel (2) or square steel pipe (3) to form a horizontal support system; The steel mesh (6) is laid on the annular platform formed by the angle steel (2), square steel pipe (3) and round steel pipe (5) as a base for workers to walk on and for materials to be temporarily placed.

2. The reusable cantilevered protective device with a central column installation according to claim 1, characterized in that: It also includes a diagonal brace (7), which is set below the cantilever section of the angle steel (2), with one end connected to the lower part of the steel strip (1) and the other end connected to the far end of the horizontal leg of the angle steel (2).

3. A reusable cantilevered protective device with a central column installation according to claim 1, characterized in that: It also includes temporary guardrails (8), which are set on the perimeter of the platform and formed by inserting or binding round steel pipes to form a guardrail with a height of not less than one meter.

4. A reusable cantilevered protective device with a central column installation according to claim 1, characterized in that: All connections are made with high-strength bolts (4) to avoid on-site welding, so that the steel strip (1), angle steel (2), square steel pipe (3), and round steel pipe (5) can be disassembled and reused.

5. A reusable cantilevered protective device with a central column installation according to claim 1, characterized in that: The number of steel strips (1) shall not be less than two, the width shall be fifty to one hundred millimeters, and the thickness shall be four to eight millimeters; the distance between two adjacent steel strips (1) shall be one to one and a half meters.

6. A reusable cantilevered protective device with a central column installation according to claim 1, characterized in that: The angle steel (2) is evenly distributed around the column, with eight to twelve angle steels; the square steel pipe (3) is connected to the angle steel (2) by double bolts, with at least two high-strength bolts at each connection point; the round steel pipe (5) is a standard steel pipe with a diameter of 48 mm and a wall thickness of 3.5 mm; the steel plate mesh (6) is a diamond mesh with a diameter of 30 mm x 30 mm and a thickness of not less than 3 mm.

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