Overhanging scaffold steel sheet net installation device and construction method thereof

Abstract

This invention discloses a steel mesh installation device and its construction method for cantilever scaffolding, belonging to the field of construction safety protection technology. The device includes cantilever scaffolding and a steel mesh. The steel mesh is installed on the outside of the cantilever scaffolding, with its upper edge fixed to the outermost horizontal bar of the scaffolding via fasteners. Vertically, it is offset downwards relative to the ground-level bar to cover exposed cantilevered I-beams and steel pipes. Reinforcement points are provided on both sides of the steel mesh, each connected to an adjacent upright via a short steel pipe. At least one tensioner is fixed at one end to the ground-level bar and at the other end to the bottom edge of the steel mesh. A top sealing plate is horizontally laid on the top of the ground-level bar. This device is mainly used for facade protection and bottom sealing of cantilever scaffolding in construction projects, achieving complete facade coverage and horizontal fall prevention sealing of the working level edge in one operation.

Description

Technical Field

[0001] This invention belongs to the field of construction safety protection technology. More specifically, this invention relates to a steel mesh installation device for cantilever scaffolding and its construction method. Background Technology

[0002] Cantilevered scaffolding is a common form of external protective scaffolding in construction projects. It usually requires steel mesh to be installed on the outside as a facade protection component to prevent construction materials and personnel from falling from the outside of the scaffolding.

[0003] In existing construction methods for installing steel mesh on the outside of cantilevered scaffolding, the installation reference is usually the ground-level bracing of the cantilever layer, with each sheet laid upwards from the height of the ground-level bracing. With this installation method, the lower edge of the steel mesh ends at the plane of the ground-level bracing, resulting in exposed steel pipes of the scaffolding below the ground-level bracing and the cantilevered ends of the cantilevered I-beams being exposed outside the mesh's coverage area. To ensure that these exposed parts also meet the aesthetic requirements for safety protection and civilized construction, additional sealing materials are needed to separately wrap and cover the exposed steel pipes and cantilevered I-beams on the facade. This practice presents the following problems in engineering practice.

[0004] First, the individual wrapping process for exposed steel pipes and cantilevered I-beams is quite cumbersome. Because the cross-sectional shape of the cantilevered I-beams is irregular, and the positional relationship between the exposed steel pipes and the I-beams varies depending on the project, the wrapping material needs to be measured, cut, and fixed piece by piece on-site. This process is fragmented and time-consuming. Especially when the cantilevered layer area is large, the workload for wrapping the bottom increases significantly, resulting in substantial consumption of labor and materials.

[0005] Secondly, the airtightness of the sealing is difficult to guarantee. The cross-sectional dimensions and relative positions of the exposed steel pipes and I-beams on the facade are not uniform, and there are many joints between the covering materials. Gaps can easily form at the joints due to construction errors or vibrations during subsequent use. These gaps constitute potential channels for objects to fall from heights, increasing the safety risks during construction.

[0006] Furthermore, after the expanded metal mesh is installed to the sweeping bar position in the conventional way, the bottom edge of the expanded metal mesh is only kept suspended by the connection between the upper part and the horizontal bar, and there is no corresponding horizontal bar at the bottom of the cantilever layer for direct fixation. Under its own weight and wind load, the bottom of the expanded metal mesh is prone to outward tilting or bulging deformation. This outward tilting tendency of the bottom is difficult to effectively restrain by the connection at the top of the expanded metal mesh alone, which has an adverse effect on the overall stability of the protection system.

[0007] Meanwhile, if the steel mesh is extended downwards to cover exposed I-beams and steel pipes, the lack of direct connection points below the plane of the ground-level bracing makes bottom fixation a significant construction challenge. Without effective bottom fixation, simply extending the steel mesh downwards does not ensure the bottom remains flush with the inside of the scaffold; in fact, the unsupported bottom may exacerbate outward deformation. Furthermore, after the steel mesh is lowered, a new horizontal opening appears between its upper edge and the horizontal working surface of the ground-level bracing, posing a potential hazard of falling objects and requiring appropriate sealing measures. Solving the problem of reliably securing the bottom while simultaneously sealing this horizontal opening presents an additional technical difficulty for the lowering installation scheme.

[0008] Furthermore, existing construction practices lack quantifiable criteria for determining the specific settlement distance of the expanded metal mesh. Construction sites typically set a fixed settlement value based on experience. This approach fails to consider variations in the height of the cantilevered I-beams and actual deviations in the installation height of the ground-level bracing in different projects, making it difficult to ensure stable full coverage of exposed components with minimal settlement under varying component sizes. Similarly, the placement of reinforcing short steel pipes added to the sides after the expanded metal mesh has settled to prevent outward tilting is also lacking quantitative basis based on stress analysis. The selection of reinforcement point locations often relies on on-site judgment, which may lead to the risk of outward displacement at the bottom even with insufficient tension and reinforcement lever arm.

[0009] The aforementioned issues necessitate improvements in the construction efficiency, sealing reliability, and structural stability of the outer protective layer of cantilevered scaffolding in the bottom area. Summary of the Invention

[0010] One objective of this invention is to provide a steel mesh installation device for cantilever scaffolding and its construction method, which simplifies the installation process, ensures safety and reliability, and is aesthetically pleasing and standardized. It can be widely applied to the external protection construction of cantilever scaffolding in various building projects.

[0011] To achieve these objectives and other advantages of the present invention, according to one aspect of the present invention, a cantilever scaffolding steel mesh installation device is provided, comprising: The cantilevered scaffolding includes multiple cantilevered I-beams, uprights, ground-level bracing, and horizontal bracing. One end of the cantilevered I-beam is anchored in the floor slab of the main structure. The multiple uprights are vertically fixed to the top surface of the cantilevered end of the cantilevered I-beam. The ground-level bracing is horizontally fixed between the multiple uprights and close to the bottom end of the uprights. The multiple horizontal bracing is horizontally fixed between adjacent uprights at intervals. A steel mesh is installed on the outside of the cantilevered scaffold. The top edge of the steel mesh is fixedly connected to the outermost horizontal bar of the cantilevered scaffold by fasteners. Reinforcement points are provided on both sides of the steel mesh. Each reinforcement point is fixedly connected to the adjacent upright by a short steel pipe. The steel mesh is offset downward relative to the ground-level bar in the vertical direction, so that the steel mesh completely covers the cantilevered scaffold. At least one tensioner, one end of which is fixed to the ground-level bar of the cantilever scaffold, and the other end is fixedly connected to the bottom edge of the steel mesh. And a top sealing plate, which is laid horizontally on top of the sweeping rod.

[0012] Preferably, the steel mesh is offset downwards relative to the sweeping rod by a distance greater than or equal to 36cm in the vertical direction.

[0013] Preferably, the two reinforcement points on the two side edges of the steel mesh are symmetrically arranged.

[0014] Preferably, the steel mesh is composed of a top frame, a bottom frame, two side frames, a mesh panel, and a keel. The top frame, bottom frame, and two side frames are all formed by welding square steel pipes. The keel is fixed inside the frame, and the mesh panel covers and is fixed on the frame.

[0015] Preferably, the tensioner includes a first hook, a second hook, and an adjustable screw connected between the first hook and the second hook. The adjustable screw is configured to apply a tension force toward the inside of the cantilever scaffold to the bottom edge by adjusting the distance between the first hook and the second hook.

[0016] Preferably, the first hook is configured as an arc-shaped hook structure that mates with the outer circumferential surface of the sweeping rod, and the second hook is configured as a right-angle hook structure that hooks onto the edge of the square steel tube at the bottom edge.

[0017] The present invention also discloses a construction method based on the aforementioned cantilever scaffold steel mesh installation device, comprising the following steps: Step 1: Fix multiple uprights to the cantilevered I-beams of the cantilevered scaffolding. Horizontally fix ground-level bracing between the bottom of these uprights. Fix multiple transverse bracing at vertical intervals between adjacent uprights. Place a steel mesh on the outside of the cantilevered scaffolding. Secure the upper edge of the steel mesh to the outermost transverse bracing of the cantilevered scaffolding using fasteners. Offset the steel mesh vertically relative to the ground-level bracing by a distance greater than or equal to 36cm. This ensures that the bottom edge of the steel mesh is vertically lower than the ground-level bracing, and that the steel mesh covers the exposed portion of the cantilevered I-beams. Step 2: Reinforcement points are set at the positions of the first side of the steel mesh near the bottom frame and the second side near the bottom frame. Each reinforcement point is fixedly connected to the adjacent upright by a short side-fixing steel pipe. One end of each short side-fixing steel pipe is connected to the corresponding side by a fastener, and the other end is connected to the upright by a fastener. The two short side-fixing steel pipes are arranged symmetrically on both sides of the steel mesh. Step 3: Fix the first hook of the tensioner to a stable steel pipe on the inside of the cantilever scaffold, and fix the second hook of the tensioner to the bottom edge of the steel mesh. Adjust the adjustable screw of the tensioner to change the distance between the first hook and the second hook, thereby applying a pulling force towards the inside of the cantilever scaffold to the bottom edge, so that the bottom of the steel mesh is taut and smooth. Step 4: Lay a top sealing plate horizontally on top of the sweeping rod, so that one end of the top sealing plate overlaps the sweeping rod and the other end extends to the upper edge of the steel mesh.

[0018] Preferably, the vertical offset distance H of the steel mesh relative to the sweeping rod satisfies: H≥h1+h2+δ; where h1 is the vertical distance from the center line of the sweeping rod to the top surface of the cantilevered I-beam, and its value is in the range of 150-200mm; h2 is the cross-sectional height of the cantilevered I-beam, and its value is in the range of 160-200mm; δ is the additional covering allowance of the bottom edge of the steel mesh being lower than the lower flange of the cantilevered I-beam, and δ is not less than 50mm.

[0019] Preferably, there are two tensioners, symmetrically arranged on the bottom frame along the vertical centerline of the steel mesh. The angle between the line connecting the first hook and the second hook of each tensioner and the vertical direction is θ, and the angle θ is not greater than 30°. The distance between the reinforcement point and the bottom frame is d, and the vertical offset distance of the steel mesh relative to the sweeping rod is H. Each reinforcement point is fixedly connected to the adjacent upright by a short side-fixing steel pipe. The axis of the short side-fixing steel pipe is parallel to the horizontal plane and perpendicular to the mesh surface direction of the steel mesh. The horizontal inward tension force applied to the steel mesh by the fixed short steel pipe is T; the tension applied by a single tensioner is F; the vertical distance between the reinforcement point and the upper frame is Hd; the connection point between the upper frame and the transverse rod is the moment balance fulcrum; T satisfies the following moment balance relationship: T·(Hd)≥F·sinθ·H, that is, T≥F·sinθ·H / (Hd); d is not less than 50mm, and the reinforcement point is configured to provide a horizontal inward constraint force to the bottom frame under the tension of the tensioner, so as to counteract the outward displacement tendency of the bottom frame caused by the horizontal outward component force generated by the oblique tension of the tensioner.

[0020] The present invention has at least the following beneficial effects: The cantilevered scaffolding steel mesh installation device of the present invention offsets the steel mesh downwards relative to the ground-level bracing, so that the bottom of the steel mesh naturally extends to the bottom of the ground-level bracing on the exterior facade, directly covering the originally exposed scaffolding steel pipes and cantilevered I-beams. This eliminates the multiple scattered processes of measuring, cutting, and wrapping I-beams and steel pipes separately in traditional construction. Only a horizontal sealing plate needs to be laid on top of the ground-level bracing to complete the bottom closure, which greatly reduces the amount of on-site manual labor and material consumption. At the same time, the sunken steel mesh and the top horizontal sealing plate form a mutually perpendicular closed loop at the outer edge of the working layer, which not only eliminates the gaps caused by the splicing of the exterior facade, but also seals the horizontal openings newly created by the sunken steel mesh. This effectively reduces the risk of materials falling through the bottom gaps and horizontal openings, so that the protective system can provide continuous blocking effect in both vertical and horizontal directions.

[0021] By setting a clear lower limit for the offset distance, construction workers can directly position and install the steel mesh based on this lower limit without relying on experience. Under common I-beam specifications and ground-level baffle installation heights, this ensures that the lower edge of the steel mesh is stably lower than the ground-level baffle and effectively conceals the exposed part of the I-beam, reducing the need for rework and adjustments due to insufficient settlement. The reinforcement points on both sides of the steel mesh are symmetrically arranged, balancing the horizontal constraint forces exerted on the bottom frame by the two side-fixed short steel pipes. This avoids mesh deflection and twisting that may be caused by unilateral tension or uneven force on both sides, helping the steel mesh maintain a vertical and straight appearance during use.

[0022] The expanded metal mesh itself is constructed using square steel pipes welded together to form the top, bottom, and side frames. An internal keel structure covers the mesh, giving the mesh sufficient overall rigidity and frame load-bearing capacity. When the tensioner applies concentrated tension to the bottom frame via hooks, and the short side steel pipes apply horizontal restraint to the sides, the frame and keel effectively distribute and transfer these local loads, preventing dents in the mesh surface or localized bending of the frame. The tensioner consists of two hooks and an adjustable threaded rod, allowing construction workers to gradually tighten the rod during installation, applying a controllable inward pull to the bottom frame. This ensures that the expanded metal mesh is tensioned to a position close to the inside of the scaffolding, even in situations lacking conventional fixing points at the bottom. Any loosening detected during use can be corrected immediately, guaranteeing long-term reliability of the connection.

[0023] The arc-shaped structure of the first hook of the tensioner fits snugly against the outer circumference of the round tube of the sweeping rod, increasing the contact area and frictional resistance. The right-angle structure of the second hook can be snapped onto the edge of the square steel tube of the bottom frame, using the cross-sectional contour to form a mechanical lock, making it difficult for either hook to slip or loosen at their respective connection points, thus improving the firmness of the tensioner's fixation at both ends. The construction method integrates the upper fixing, side reinforcement, bottom tightening, and top sealing into orderly steps, clearly defining the components and connection relationships involved in each step. This allows different operators to perform the work in a unified sequence, reducing quality defects that may be caused by omissions in procedures and arbitrary operations, and ensuring the consistency and acceptability of the installation results.

[0024] The offset distance is determined by establishing a geometric relationship between the distance from the centerline of the sweeping rod to the top surface of the I-beam, the cross-sectional height of the I-beam, and the additional coverage allowance. This ensures that the settlement amount is no longer a fixed empirical value detached from site conditions, but a calculable quantity directly related to the actual dimensions of the engineering components. Thus, for different I-beam specifications and sweeping rod installation heights, the minimum settlement distance that precisely meets the full coverage requirement can be determined based on measurable dimensions on site. This avoids both the risk of bottom exposure due to insufficient settlement and the material waste caused by excessive settlement. The reinforcement point positions are set based on the torque balance relationship, incorporating the distance from the reinforcement point to the bottom of the frame, the tilt angle of the tensioner, and the horizontal constraint force required by the short steel pipes on the sides into a unified mechanical relationship. This provides a clear force basis for the selection of reinforcement points, ensuring that the horizontal force arm provided by the reinforcement short steel pipes can effectively counteract the overturning tendency caused by the outward horizontal component of the tensioner's tilting force. From a force mechanism perspective, this eliminates the potential for outward displacement of the bottom of the steel mesh after tensioning.

[0025] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the installation of the cantilever scaffolding steel mesh installation device according to one technical solution of the present invention.

[0027] Figure 2 This is a schematic diagram of the tensioner described in one technical solution of the present invention.

[0028] Figure 3 This is a schematic diagram of the steel mesh structure described in one technical solution of the present invention. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to specific embodiments, so that those skilled in the art can implement it based on the description.

[0030] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0031] It should be noted that, unless otherwise specified, the experimental methods described in the following implementation plan are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified.

[0032] In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] like Figures 1-3 As shown, the present invention provides a steel mesh installation device for cantilever scaffolding, comprising: The cantilevered scaffolding includes multiple cantilevered I-beams 100, uprights 101, ground-level bracing 102, and transverse bracing 103. One end of each cantilevered I-beam 100 is anchored in the floor slab of the main structure 400. The multiple uprights 101 are vertically fixed to the top surface of the cantilevered end of the cantilevered I-beam 100. The ground-level bracing 102 is horizontally and vertically fixed between the multiple uprights 101 and close to the bottom end of the uprights 101. The multiple transverse bracing 103 is horizontally and spaced between adjacent uprights 101. A steel mesh 200 is installed on the outside of the cantilever scaffold. The top edge 202 of the steel mesh 200 is fixedly connected to the outermost horizontal bar 103 of the cantilever scaffold by fasteners. Reinforcement points 201 are provided on both side edges 204 of the steel mesh 200. Each reinforcement point 201 is fixedly connected to the adjacent upright bar 101 by a short steel pipe. The steel mesh 200 is offset downward relative to the sweeping bar 102 in the vertical direction, so that the steel mesh 200 completely covers the cantilever scaffold. At least one tensioner 300, one end of which is fixed to the ground sweeping bar 102 of the cantilever scaffold, and the other end is fixedly connected to the bottom edge frame 203 of the steel mesh 200; And a top sealing plate, which is laid horizontally on top of the sweeping rod 102.

[0034] In the above technical solution, the cantilevered scaffolding steel mesh installation device can be used for facade protection and bottom enclosure of the cantilevered scaffolding during the construction of the main building. In one specific embodiment, the device includes cantilevered scaffolding, steel mesh 200, tensioner 300, and top sealing plate. The load-bearing foundation of the cantilevered scaffolding can be selected from multiple cantilevered I-beams 100. One end of each I-beam can be anchored to the floor slab of the main structure through a U-shaped steel bar tie ring. The top surface of the cantilevered end of the I-beam can be welded with a positioning steel bar head. Multiple uprights 101 can be fitted onto the positioning steel bar head and vertically fixed. A ground-level bar 102 can be horizontally connected between the uprights 101 near the bottom position through fasteners. The distance between the center line of the ground-level bar 102 and the top surface of the I-beam can be no more than 200mm to ensure bottom rigidity. Multiple horizontal bars 103 can be horizontally fixed between adjacent uprights 101 at intervals along the vertical direction using fasteners. The spacing of the horizontal bars 103 can be set to 1.5m or 1.8m according to safety specifications to form the basic load-bearing frame of the structure.

[0035] The expanded metal mesh 200 can be a standard protective mesh sheet welded from square steel pipe frames, internal keel, and perforated mesh. Its top frame 202 is fixedly connected to a horizontal bar 103 located on the outermost side of the cantilever scaffolding via right-angle couplers. The expanded metal mesh 200 is offset downwards relative to the ground-level bar 102 in the vertical direction, and the offset distance can be set to not less than 360mm, so that the bottom frame 203 of the expanded metal mesh 200 is lower than the plane of the ground-level bar 102 and covers the cantilever I-beam 100 and exposed steel pipes. To enhance bottom stability, a reinforcement point 201 is set on each of the two side frames 204 of the expanded metal mesh 200. Each reinforcement point 201 can be connected to the nearest upright bar 101 via a short steel pipe. One end of the short steel pipe is fixed to the side frame of the expanded metal mesh 200 via a coupler, and the other end is fixed to the upright bar 101 via a coupler, forming a symmetrical side tie. Two tensioners 300 can be set. One end of each tensioner 300 can be fixed to the sweeping rod 102, and the other end can be fixed to the bottom edge 203 of the steel mesh 200. By adjusting the screw of the tensioner 300, the bottom of the steel mesh 200 can be made to stick tightly to the inside of the scaffold and remain taut after installation.

[0036] The top sealing panel can be made of plywood or galvanized steel sheet, laid horizontally on top of the sweeping rod 102. One side of the sealing panel can rest on the sweeping rod 102, and the other side extends to the upper edge of the steel mesh 200, sealing the horizontal gap formed at the edge of the working layer due to the sinking of the steel mesh 200. In actual construction, first erect the pole 101 on the I-beam and install the sweeping rod 102 and the horizontal bar 103. Then, lift the steel mesh 200 to the outside, fasten the upper end to the horizontal bar 103, then install the short steel pipes on both sides, and finally connect the tensioner 300 and gradually tighten it to complete the overall closure by laying the top sealing panel. The device uses a steel mesh 200 to cover exposed components, eliminating the need for separate wrapping of I-beams and steel pipes. The horizontal sealing at the top of the sweeping rod 102 works in conjunction with the sunken steel mesh 200 to form a continuous vertical and horizontal protective surface, reducing the risk of falling objects caused by gaps at the bottom. The short steel pipes on the sides work in conjunction with the tensioner 300 to ensure that the bottom of the steel mesh 200 remains flat and does not tilt outward even without the support of the sweeping rod 102. The overall structure is easy to disassemble and reuse.

[0037] In some other technical solutions, the steel mesh 200 is offset downwards relative to the sweeping rod 102 by a distance greater than or equal to 36cm in the vertical direction.

[0038] In the above technical solution, the downward offset distance of the steel mesh 200 relative to the sweeping rod 102 in the vertical direction is set to be no less than 360mm. This value is determined by comprehensively considering the common cross-sectional height range of cantilevered I-beams 100 and the installation height deviation of the sweeping rod 102. In specific implementation, a No. 16 I-beam with a cross-sectional height of 160mm can be selected as the cantilever beam. The distance from the centerline of the sweeping rod 102 to the top surface of the I-beam can be controlled within 200mm according to specifications. At this time, the exposed height of the I-beam below the sweeping rod 102 is approximately 160mm. Adding the 200mm distance between the sweeping rod 102 and the top surface of the I-beam, the steel mesh 200 needs an offset distance of at least 360mm to cover below the lower flange of the I-beam. If a No. 20 I-beam with a cross-sectional height of 200mm is selected in the project, and the distance between the sweeping rod 102 and the top surface of the I-beam is 200mm, the offset distance can be increased accordingly to over 400mm. Before installation, construction workers can measure the height of the I-beam cross section and the actual installation position of the sweeping bar 102 on site. Based on the measurement results, the final offset value is determined on the basis of the lower limit of 360mm, so as to ensure that the bottom edge of the steel mesh 200 can reliably be lower than the lower flange of the cantilevered I-beam 100, thus achieving stable shielding of the exposed part of the I-beam.

[0039] In other technical solutions, the two reinforcement points 201 of the two side frames 204 of the steel mesh 200 are symmetrically arranged.

[0040] In the above technical solution, the two reinforcement points 201 on the two side frames 204 of the expanded metal mesh 200 are symmetrically arranged. The two reinforcement points 201 are located on the first and second sides of the expanded metal mesh 200, respectively, and are symmetrical on the left and right sides when the expanded metal mesh 200 is installed. Each reinforcement point 201 is connected to the adjacent upright 101 by a short steel pipe. One end of the short steel pipe can be fixed to the square steel pipe of the side frame of the expanded metal mesh 200 by a right-angle fastener, and the other end of the short steel pipe is fixed to the nearest upright 101 by a right-angle fastener. The axial directions of the two short steel pipes can be parallel to the horizontal plane and perpendicular to the mesh surface direction of the expanded metal mesh 200. In this way, the horizontal constraint forces exerted by the two short steel pipes on the expanded metal mesh 200 are opposite in direction and basically equal in magnitude under the condition of symmetrical arrangement, forming a symmetrical support effect on the bottom frame. During the tensioning process of the tensioner 300, the oblique tension of the tensioner 300 will generate a horizontal component force that causes the bottom of the steel mesh 200 to shift outward. The symmetrical reinforcement points 201 on both sides simultaneously pull the bottom of the steel mesh 200 inward, effectively offsetting this outward component force and preventing the bottom of the steel mesh 200 from deflecting or twisting, so that the steel mesh 200 remains straight in the vertical direction.

[0041] In some other technical solutions, the steel mesh 200 is composed of a top frame 202, a bottom frame 203, two side frames 204, a mesh sheet, and a keel 205. The top frame 202, the bottom frame 203, and the two side frames 204 are all formed by welding square steel pipes. The keel 205 is fixed inside the frame, and the mesh sheet covers and is fixed on the frame.

[0042] In the above technical solution, the top frame 202, bottom frame 203, and side frame 204 of the expanded metal mesh 200 can all be formed by welding square steel tubes to create a rectangular outer frame. The cross-sectional dimensions of the square steel tubes can be 20mm×20mm or 25mm×25mm, and the wall thickness can be between 1.2mm and 1.5mm. One or more ribs 205 can be installed inside the frame. The ribs 205 can also be made of square steel tubes, and their ends are welded and fixed to the inner sides of the side frame 204 to enhance the overall rigidity of the mesh. The mesh can be made of galvanized perforated steel sheet with a thickness of 0.5mm to 0.8mm and a hole diameter between 5mm and 10mm. The mesh covers the frame and the ribs 205 and is fixed to the perimeter of the frame by welding or self-tapping screws. The steel mesh 200 employs a structure reinforced with a welded frame made of square steel tubes and internal keel 205, giving it sufficient bending stiffness. When subjected to the tension at the bottom of the tensioner 300 and the horizontal constraint force of the short steel tubes on the sides, the frame and keel 205 effectively distribute the load, preventing localized dents or twisting of the steel mesh 200. The external dimensions of the steel mesh 200 can be customized according to the height of the scaffolding and the spacing of the horizontal bars 103. The height of a single sheet of steel mesh 200 can be equal to or slightly greater than the step distance of the frame above the sweeping bar 102, and the width can match the spacing between two adjacent uprights 101.

[0043] In some other technical solutions, the tensioner 300 includes a first hook 301, a second hook 302, and an adjustable screw 303 connected between the first hook 301 and the second hook 302. The adjustable screw 303 is configured to apply a pulling force toward the inside of the cantilever scaffold to the bottom edge 203 by adjusting to change the distance between the first hook 301 and the second hook 302.

[0044] In the above technical solution, the tensioner 300 includes a first hook 301, a second hook 302, and an adjustable screw 303 connecting the two. The body of the tensioner 300 can be a turnbuckle-type tensioner 300 commonly used in construction. The first hook 301 and the second hook 302 are connected to both ends of the screw, respectively. Rotating the adjusting nut in the middle of the screw changes the effective distance between the two hooks. The first hook 301 can be fixed to the sweeping rod 102. The fixing method can be to directly hook the first hook 301 onto the steel pipe of the sweeping rod 102, or to reinforce it with wire after hooking the first hook 301. The second hook 302 is fixed to the bottom frame 203 of the steel mesh 200. When the construction worker rotates the adjusting nut in one direction, the screw shortens, the distance between the first hook 301 and the second hook 302 decreases, thereby applying a pulling force towards the sweeping rod 102 to the bottom frame of the steel mesh 200. Since the sweeping rod 102 is located inside the cantilevered scaffold, the direction of the tension is diagonally inward and upward, causing the bottom of the steel mesh 200 to be pulled towards the inside of the scaffold and pressed tightly. Two tensioners 300 can be set, respectively arranged near the left and right ends of the bottom frame of the steel mesh 200 to ensure even force distribution at the bottom. Initially, the tensioners 300 can be tightened. After all the upper and side reinforcement points 201 of the steel mesh 200 are fixed, the threaded rods are gradually adjusted until the bottom frame is pressed tightly and tensioned. After correction, the degree of contact between the bottom frame and the inside of the scaffold is checked.

[0045] In other technical solutions, the first hook 301 is configured as an arc-shaped hook structure that cooperates with the outer peripheral surface of the sweeping rod 102, and the second hook 302 is configured as a right-angle hook structure that hooks onto the edge of the square steel tube of the bottom frame 203.

[0046] In the above technical solution, the first hook 301 is configured as an arc-shaped hook structure that mates with the outer circumference of the sweeping rod 102, and the second hook 302 is configured as a right-angle hook structure that hooks onto the edge of the square steel tube of the bottom frame 203. The radius of curvature of the arc portion of the first hook 301 can match the radius of the steel tube of the sweeping rod 102. The arc curvature of the first hook 301 allows its inner arc surface to form a large contact area with the outer wall of the steel tube, making it less prone to sliding along the circumference of the steel tube under tension. The right-angle structure of the second hook 302 can be designed as an open rectangular hook groove. The width of the hook groove matches the wall thickness and cross-sectional width of the square steel tube of the bottom frame 203, so that one edge of the square steel tube fits precisely into the hook groove, and the inner corner of the hook groove interlocks with the right-angle edge of the square steel tube to form a locking connection. The main body material of the two hooks can be made of round steel or flat steel bent into shape, and the surface is galvanized to prevent rust. During installation, first place the first hook 301 onto the appropriate position of the sweeping rod 102, then snap the second hook 302 into the edge of the square steel tube on the bottom frame. After confirming that both hooks are secure, rotate the screw to tighten. This shape-matching hook design utilizes the respective shape characteristics of the round and square tubes, making it less likely for the hooks to loosen or shift at their respective connection points, thus improving the fixing reliability of the tensioner 300 under long-term use and vibration environments.

[0047] This invention also discloses a construction method based on the cantilevered scaffolding steel mesh 200 installation device, comprising the following steps: Step 1: Fix multiple uprights 101 to the cantilevered I-beam 100 of the cantilevered scaffolding. Horizontally fix ground-level bracing 102 between the bottom of the uprights 101. Fix multiple transverse bracing 103 at vertical intervals between adjacent uprights 101. Place a steel mesh 200 on the outside of the cantilevered scaffolding. Fix the upper edge of the steel mesh 200 to the outermost transverse bracing 103 of the cantilevered scaffolding using fasteners. This causes the steel mesh 200 to be vertically offset downwards relative to the ground-level bracing 102 by a distance greater than or equal to 36cm. This ensures that the bottom edge 203 of the steel mesh 200 is vertically lower than the ground-level bracing 102, and that the steel mesh 200 covers the exposed portion of the cantilevered I-beam 100. Step 2: Reinforcement points 201 are provided on the first side of the steel mesh 200 near the bottom frame 203 and on the second side near the bottom frame 203. Each reinforcement point 201 is fixedly connected to the adjacent upright 101 by a short side-fixing steel pipe. One end of each short side-fixing steel pipe is connected to the corresponding side by a fastener, and the other end is connected to the upright 101 by a fastener. The two short side-fixing steel pipes are arranged symmetrically on both sides of the steel mesh 200. Step 3: Fix the first hook 301 of the tensioner 300 to a stable steel pipe on the inner side of the cantilever scaffold, and fix the second hook 302 of the tensioner 300 to the bottom edge frame 203 of the steel mesh 200. Adjust the adjustable screw 303 of the tensioner 300 to change the distance between the first hook 301 and the second hook 302, thereby applying a pulling force towards the inner side of the cantilever scaffold to the bottom edge frame 203, so that the bottom of the steel mesh 200 is taut and smooth. Step 4: Lay a top sealing plate horizontally on the top of the sweeping rod 102, so that one end of the top sealing plate overlaps the sweeping rod 102 and the other end extends to the upper edge of the steel mesh 200.

[0048] In the above technical solution, step one involves installing and anchoring the cantilevered I-beam 100 on the floor slab of the main structure, with its cantilevered end extending outwards. The anchoring end of the I-beam can be connected to the embedded parts in the floor slab via U-shaped steel bar rings. Positioning steel bar heads are pre-welded to the top surface of the cantilevered end for fixing the uprights 101. Multiple uprights 101 are sequentially fitted onto the positioning steel bar heads, and after adjusting their verticality, they are temporarily fixed, ensuring that the uprights 101 stand vertically on the top surface of the I-beam. At the bottom of the uprights 101 near the top surface of the I-beam, a ground-level bracing rod 102 is horizontally connected between the multiple uprights 101 using right-angle couplers. The distance from the center line of the ground-level bracing rod 102 to the top surface of the I-beam can be controlled within the range of 150mm to 200mm. Between adjacent uprights 101, multiple horizontal bars 103 are installed vertically from bottom to top at intervals. Each horizontal bar 103 is fixed to the upright 101 at both ends using right-angle couplers. The interval between horizontal bars 103 can be set to 1.5m or 1.8m. After the scaffolding is erected, the steel mesh 200 is hoisted to the outside of the cantilevered scaffolding. The upper edge of the steel mesh 200 is placed against the outermost horizontal bar 103 of the scaffolding, and the upper edge is locked to the horizontal bar 103 using right-angle couplers. The steel mesh 200 is offset downwards relative to the ground-level bar 102 in the vertical direction. The offset distance can be set to 360mm, so that the bottom edge 203 of the steel mesh 200 is lower than the plane of the ground-level bar 102 in the vertical direction, and the lower part of the steel mesh 200 covers the exposed surface of the cantilevered end of the cantilevered I-beam 100 and the exposed steel pipe below the ground-level bar 102. The offset distance can be determined by referring to the distance from the center line of the sweeping rod 102 to the top surface of the I-beam and the cross-sectional height of the I-beam, which are measured on site. The offset distance should be appropriately increased based on the lower limit of 360mm to ensure complete coverage.

[0049] In step two, a reinforcement point 201 is set at the first side of the steel mesh 200 near the bottom frame 203, and at the second side of the steel mesh 200 near the bottom frame 203. The distance between the reinforcement point 201 and the bottom frame 203 can be between 50mm and half the height of the side frame 204. The two reinforcement points 201 are symmetrical on the left and right sides of the steel mesh 200. During construction, two short steel pipes are used for side fixing. One end of each short steel pipe is clamped and fixed to the square steel pipe of the corresponding side frame of the steel mesh 200 with a right-angle coupler, and the other end is clamped and fixed to the nearest upright 101 with a right-angle coupler. The axis of the two short steel pipes should be parallel to the horizontal plane and perpendicular to the mesh surface of the steel mesh 200 to provide a horizontal tie force pointing inward to the scaffolding. During installation, the fasteners at both ends of the short steel pipe are pre-tightened. After both sides are connected in place, they are tightened uniformly to ensure that the constraint force applied by the two reinforcement points 201 to the bottom of the steel mesh 200 is as balanced as possible.

[0050] In step three, the first hook 301 of the tensioner 300 is fixed to a sturdy steel pipe inside the cantilever scaffold. This sturdy steel pipe can be a ground-level bracing 102 located inside the cantilever layer, or a horizontal crossbar added between the uprights 101. Its position should ensure that the angle between the tensioner 300 and the vertical direction when connected obliquely does not exceed 30 degrees. The arc-shaped hook structure of the first hook 301 fits against the outer circumference of the round pipe of the steel pipe to be hung. After hanging, it can be reinforced with binding wire around the hook opening to prevent the hook from slipping off during tensioning. The right-angle hook structure of the second hook 302 engages with the edge of the square steel pipe of the bottom frame 203 of the expanded metal mesh 200, so that the hook groove and the right-angle side of the square steel pipe interlock. Two tensioners 300 can be used, symmetrically arranged on the left and right sides of the bottom frame of the expanded metal mesh 200. After confirming that both hooks are secure, use a wrench to rotate the adjusting nut in the middle of the adjustable screw 303, shortening the screw and gradually reducing the distance between the first hook 301 and the second hook 302. This applies a pulling force to the bottom edge of the steel mesh 200 towards the inside of the scaffold. The two tensioners 300 should be tightened alternately and synchronously to avoid excessive force on one side, which could cause the bottom to tilt. During the tensioning process, continuously observe the fit between the bottom of the steel mesh 200 and the inside of the scaffold until the bottom edge is tight, the mesh surface is smooth and does not bulge outward, completing the bottom tensioning and fixing.

[0051] In step four, a top sealing panel is laid horizontally on top of the sweeping rod 102. The sealing panel can be made of plywood with a thickness of not less than 15mm, or galvanized checkered steel plate with a thickness of 0.8mm to 1.2mm. The width of the panel should cover the horizontal distance between the top of the sweeping rod 102 and the upper edge of the steel mesh 200. During installation, one side of the sealing panel rests on the sweeping rod 102 and is fixed to it with wire or nails. The other side extends above or close to the inner side of the upper edge of the steel mesh 200, ensuring no obvious gaps between the outer edge of the panel and the mesh surface of the steel mesh 200. The sealing panels are spliced ​​together piece by piece along the length of the sweeping rod 102, and the joints between adjacent panels can be sealed with tape or metal strips. This horizontal sealing and the sunken steel mesh 200 form a vertical loop at the outer edge of the operating layer, closing the new horizontal opening caused by the sunken steel mesh 200.

[0052] After the above four steps are completed in sequence, check the overall verticality and flatness of the steel mesh 200, confirm that the upper fasteners are not loose, the short steel pipes fixed on both sides are evenly stressed, the tension of the tensioner 300 is consistent and there is no sign of slippage, and the top sealing plate is laid flat and the joints are tight. The acceptance is then completed.

[0053] This construction method integrates top fixing, side reinforcement, bottom tightening, and top sealing into a sequential operation process. Components involved in each step can be commercially available products such as common steel pipes, fasteners, standard steel mesh 200, and turnbuckle-type tensioners 300. The recessed arrangement of the steel mesh 200 eliminates the need for separate wrapping of the I-beams and exposed steel pipes. The horizontal sealing at the top of the sweeping bar 102, in conjunction with the recessed steel mesh 200, forms a continuous vertical and horizontal protective surface, reducing the risk of objects falling through bottom gaps. The symmetrically arranged short steel pipes for side fixing and the bottom tensioners 300 work together to ensure that the bottom of the steel mesh 200 remains aligned and does not tilt outwards even without direct support from the sweeping bar. The overall protective structure is easy to disassemble, assemble, and reuse.

[0054] In other technical solutions, the vertical offset distance H of the steel mesh 200 relative to the sweeping rod 102 satisfies: H≥h1+h2+δ; where h1 is the vertical distance from the center line of the sweeping rod 102 to the top surface of the cantilevered I-beam 100, and its value is in the range of 150-200mm; h2 is the cross-sectional height of the cantilevered I-beam 100, and its value is in the range of 160-200mm; δ is the additional covering allowance of the bottom edge frame 203 of the steel mesh 200 being lower than the lower flange of the cantilevered I-beam 100, and δ is not less than 50mm.

[0055] In the above technical solution, the method for determining the downward offset distance H of the steel mesh 200 relative to the ground-level bar 102 in the vertical direction is not based on a fixed empirical value, but rather on the geometric dimensions of the actual components at the bottom of the cantilever scaffold. This is achieved through a quantitative relationship containing three parameters to meet the full coverage requirements under different engineering conditions. In this relationship, h1 is the vertical distance from the center line of the ground-level bar 102 to the top surface of the cantilever I-beam 100. Its value is related to the installation height of the ground-level bar 102 at the construction site, and is typically within the range of 150mm to 200mm. The specific value can be obtained by construction personnel after the ground-level bar 102 is installed, by measuring vertically from the center of the steel pipe of the ground-level bar 102 to the top surface of the I-beam using a measuring tape. h2 is the cross-sectional height of the cantilevered I-beam 100. This value depends on the I-beam specification selected for the project. When using a No. 16 I-beam, h2 is approximately 160mm; when using a No. 18 I-beam, h2 is approximately 180mm; and when using a No. 20 I-beam, h2 is approximately 200mm. Therefore, the value of h2 can be within the range of 160mm to 200mm. The specific value can be confirmed by referring to the product label of the I-beam or by directly measuring the cross-sectional height. δ is the additional covering allowance for the bottom edge 203 of the steel mesh 200 to be lower than the lower flange of the cantilevered I-beam 100. δ is not less than 50mm. Its function is to reserve a certain safety margin for construction errors and component deformation, ensuring that even under the most unfavorable installation deviation conditions, the bottom edge of the steel mesh 200 can still reliably be lower than the lower flange of the I-beam, without local exposure.

[0056] During construction, first, the anchoring of the cantilevered I-beam 100 and the erection of the uprights 101, the ground bracing 102, and the transverse bracing 103 are completed. Then, the distance from the centerline of the ground bracing 102 to the top surface of the I-beam is measured to obtain the specific value of h1. At the same time, the cross-sectional specifications of the I-beam are confirmed to determine h2. The measured values ​​of h1 and h2 are added together, plus an additional allowance of not less than 50mm δ, to calculate the minimum value of the offset distance H. For example, when the measured h1 on site is 180mm and the cross-sectional height of the I-beam h2 is 160mm, the minimum value of H is 180 + 160 + 50, which is 390mm. Accordingly, the steel mesh 200 is offset downwards at least 390mm vertically relative to the sweeping bar 102, so that the bottom edge 203 of the steel mesh 200 is at least 50mm lower than the lower flange of the I-beam, and the lower part of the steel mesh 200 covers the entire exposed surface of the cantilevered I-beam 100 and the exposed steel pipe below the sweeping bar 102. The upper edge of the steel mesh 200 is fixed to the outermost horizontal bar 103 of the cantilevered scaffolding with fasteners, and the two side reinforcement points 201 are connected to the adjacent uprights 101 by side-fixed short steel pipes. The bottom is tensioned and fixed by tensioners 300. Finally, sealing plates are laid on top of the sweeping bar 102 to complete the horizontal closure.

[0057] The advantage of using the above-mentioned method for determining the offset distance based on geometric closure conditions is that the offset distance is no longer a fixed empirical value detached from the dimensions of the components on site, but a calculable quantity directly related to the actual installation height of the sweeping rod 102, the cross-sectional specifications of the I-beam, and the additional covering allowance. Even if the specifications of the I-beam and the installation height of the sweeping rod 102 vary in different projects, construction personnel can calculate the minimum settlement distance that precisely meets the full coverage requirement by substituting the measured parameters into the formula. This avoids both insufficient settlement causing localized exposure of the I-beam bottom and excessive settlement leading to material waste and increased difficulty in bottom fixing. The setting of an additional covering allowance δ of not less than 50mm provides a buffer space for construction errors and component deformation, ensuring a stable full-coverage effect under various working conditions.

[0058] In some other technical solutions, the number of tensioners 300 is two, and the two tensioners 300 are symmetrically arranged on the bottom frame along the vertical center line of the steel mesh 200. The angle between the line connecting the first hook 301 and the second hook 302 of each tensioner 300 and the vertical direction is θ, and the angle θ is not greater than 30°. The distance between the reinforcement point 201 and the bottom frame is d, and the vertical offset distance of the steel mesh 200 relative to the sweeping rod 102 is H. Each reinforcement point 201 is fixedly connected to the adjacent upright rod 101 by a short side-fixing steel pipe. The axis of the short side-fixing steel pipe is parallel to the horizontal plane and perpendicular to the steel mesh 200. In the mesh direction, the horizontal inward tension force applied by the side-fixed short steel pipe to the steel mesh 200 is T; the tension applied by a single tensioner 300 is F; the vertical distance between the reinforcement point 201 and the upper frame is Hd; taking the connection point of the upper frame and the horizontal rod 103 as the moment balance fulcrum, T satisfies the following moment balance relationship: T·(Hd)≥F·sinθ·H, that is, T≥F·sinθ·H / (Hd); d is not less than 50mm, and the reinforcement point 201 is configured to provide a horizontal inward constraint force to the bottom frame under the tension of the tensioner 300, so as to counteract the outward displacement tendency of the bottom frame caused by the horizontal outward component force generated by the oblique tension of the tensioner 300.

[0059] In the above technical solution, two tensioners 300 are symmetrically arranged on the bottom frame along the vertical center line of the steel mesh 200. During installation, the symmetrical center line can be marked on the bottom frame beforehand with a stone pencil or marker. Then, equal distances are measured to the left and right sides based on the center line to determine the hanging positions of the two tensioners 300. The line connecting the first hook 301 and the second hook 302 of each tensioner 300 forms an angle θ with the vertical direction. This angle θ can be directly measured with a protractor or a level with angle measurement function after the tensioners 300 are hung. During construction, the value of θ can be changed by adjusting the fixed position of the first hook 301 on the sweeping rod 102. To control the horizontal component of the tensioner 300 within an acceptable range, the value of θ should not exceed 30°. When θ exceeds 30°, the first hook 301 can be moved away from the steel mesh 200 along the sweeping rod 102 to reduce the angle of the tension. The vertical offset distance H of the steel mesh 200 relative to the sweeping rod 102 has been determined in the previous steps. This distance can be verified by measuring from the upper surface of the sweeping rod 102 to the lower edge of the bottom frame of the steel mesh 200.

[0060] The distance between the reinforcement point 201 and the bottom frame is d, which can be no less than 50mm. However, d should not exceed half the total height of the side frame 204 of the steel mesh 200 to ensure that the reinforcement point 201 has sufficient lever arm length to exert its restraining effect. Each reinforcement point 201 is fixedly connected to the adjacent upright 101 by a short side-fixed steel pipe. During installation, the axis of the short side-fixed steel pipe should be adjusted to be parallel to the horizontal plane and perpendicular to the mesh surface direction of the steel mesh 200. This ensures that the tension force applied by the short steel pipe is horizontally inward, facilitating direct neutralization against the horizontally outward component of the inclined tension force generated by the tensioner 300. The horizontally inward tension force applied by the short side-fixed steel pipe to the steel mesh 200 is T, and this force is established after the fastener bolts are tightened. The tension applied by a single tensioner 300 is F. The magnitude of F can be controlled by the construction worker by rotating the adjustable screw 303 with a wrench. The tension is such that the bottom edge of the steel mesh 200 is tightly against the inside of the scaffold and the mesh surface is smooth and does not bulge outwards. The vertical distance between the reinforcement point 201 and the upper edge is Hd, which represents the length of the lever arm of the horizontal constraint force T at the reinforcement point 201.

[0061] Using the connection point between the upper edge of the steel mesh 200 and the outermost horizontal bar 103 as the moment balance fulcrum, the horizontal outward component force F·sinθ of the tensioner 300, with the offset distance H as the lever arm, generates a moment on the bottom of the steel mesh 200 that causes it to tilt outward; the horizontal inward tension force T of the reinforcement point 201, with Hd as the lever arm, generates a stabilizing moment that counteracts it. To eliminate the tendency of the bottom to shift outward from the force, the two moments should satisfy the relationship that T·(Hd) is not less than F·sinθ·H, that is, T should be at least equal to F·sinθ·H divided by (Hd). When determining the value of d, the construction personnel can substitute the measured H and θ on site into the above relationship, and estimate the required T value in combination with the tension force F that the tensioner 300 can apply. Under the premise that d is not less than 50mm, a reinforcement point 201 position is selected that makes T within the actual achievable range. When H is large or θ is too large, resulting in a higher required T value, d can be appropriately increased to lengthen the lever arm Hd, thereby reducing the requirement for T.

[0062] During on-site operation, first, the upper part of the steel mesh 200 is fixed and offset positioned. Then, according to the selected value of d, the reinforcement points 201 are marked on both sides of the steel mesh 200. The short steel pipes for side fixing are installed and the fasteners are tightened to ensure that T is applied in place. Next, the two tensioners 300 are hung symmetrically. The first hook 301 is fixed to the sweeping rod 102, and the second hook 302 is inserted into the edge of the square steel pipe of the bottom frame. The position of the first hook 301 is adjusted so that θ is controlled within 30°. Then, the adjusting nuts of the two tensioners 300 are rotated alternately and synchronously to gradually tighten the screw. During the tensioning process, the fit between the bottom of the steel mesh 200 and the inside of the scaffold is observed to confirm that the mesh surface is straight and the bottom frame does not bulge outward. After tensioning is completed, the horizontal outward component of the inclined tension of the tensioner 300 is effectively offset by the horizontal inward tension provided by the reinforcement points 201 on both sides, and the bottom of the steel mesh 200 remains flat and stable even without the direct support of the sweeping bar 102.

[0063] By setting the location of the reinforcement point 201 in relation to the torque balance relationship of the tensioner 300, the beneficial effect is that the selection of the reinforcement point 201 location is elevated from relying on field experience to a quantitative decision with clear mechanical basis, establishing a verifiable correlation between the distance d of the reinforcement point 201, the tilt angle θ of the tensioner 300, and the required horizontal constraint force T. By satisfying the torque balance condition, the horizontal inward tension force provided by the reinforcement point 201 can effectively counteract the overturning tendency of the bottom frame caused by the outward component of the oblique tension of the tensioner 300. From the force mechanism perspective, this eliminates the hidden danger of outward displacement of the bottom of the steel mesh 200 after tensioning, ensuring that the bottom remains in a tight state throughout the entire service life, thereby stably achieving full shielding protection for exposed I-beams and steel pipes.

[0064] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A steel mesh installation device for cantilevered scaffolding, characterized in that, include: The cantilevered scaffolding includes multiple cantilevered I-beams, uprights, ground-level bracing, and horizontal bracing. One end of the cantilevered I-beam is anchored in the floor slab of the main structure. The multiple uprights are vertically fixed to the top surface of the cantilevered end of the cantilevered I-beam. The ground-level bracing is horizontally fixed between the multiple uprights and close to the bottom end of the uprights. The multiple horizontal bracing is horizontally fixed between adjacent uprights at intervals. A steel mesh is installed on the outside of the cantilevered scaffold. The top edge of the steel mesh is fixedly connected to the outermost horizontal bar of the cantilevered scaffold by fasteners. Reinforcement points are provided on both sides of the steel mesh. Each reinforcement point is fixedly connected to the adjacent upright by a short steel pipe. The steel mesh is offset downward relative to the ground-level bar in the vertical direction, so that the steel mesh completely covers the cantilevered scaffold. At least one tensioner, one end of which is fixed to the ground-level bar of the cantilever scaffold, and the other end is fixedly connected to the bottom edge of the steel mesh. And a top sealing plate, which is laid horizontally on top of the sweeping rod.

2. The cantilever scaffolding steel mesh installation device as described in claim 1, characterized in that, The steel mesh is offset downwards relative to the sweeping rod by a distance greater than or equal to 36cm in the vertical direction.

3. The cantilever scaffolding steel mesh installation device as described in claim 1, characterized in that, The steel mesh has two symmetrical reinforcement points on its two side edges.

4. The cantilever scaffolding steel mesh installation device as described in claim 1, characterized in that, The steel mesh consists of a top frame, a bottom frame, two side frames, a mesh panel, and a keel. The top frame, bottom frame, and two side frames are all formed by welding square steel pipes. The keel is fixed inside the frame, and the mesh panel covers and is fixed on the frame.

5. The cantilever scaffolding steel mesh installation device as described in claim 4, characterized in that, The tensioner includes a first hook, a second hook, and an adjustable screw connecting the first hook and the second hook. The adjustable screw is configured to apply a tension force toward the inside of the cantilever scaffold to the bottom edge by adjusting the distance between the first hook and the second hook.

6. The cantilever scaffolding steel mesh installation device as described in claim 5, characterized in that, The first hook is configured as an arc-shaped hook structure that mates with the outer circumference of the sweeping rod, and the second hook is configured as a right-angle hook structure that hooks onto the edge of the square steel tube at the bottom edge.

7. A construction method based on the cantilevered scaffolding steel mesh installation device as described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Fix multiple uprights to the cantilevered I-beams of the cantilevered scaffolding. Horizontally fix ground-level bracing between the bottom of these uprights. Fix multiple transverse bracing at vertical intervals between adjacent uprights. Place a steel mesh on the outside of the cantilevered scaffolding. Secure the upper edge of the steel mesh to the outermost transverse bracing of the cantilevered scaffolding using fasteners. Offset the steel mesh vertically relative to the ground-level bracing by a distance greater than or equal to 36cm. This ensures that the bottom edge of the steel mesh is vertically lower than the ground-level bracing, and that the steel mesh covers the exposed portion of the cantilevered I-beams. Step 2: Reinforcement points are set at the positions of the first side of the steel mesh near the bottom frame and the second side near the bottom frame. Each reinforcement point is fixedly connected to the adjacent upright by a short side-fixing steel pipe. One end of each short side-fixing steel pipe is connected to the corresponding side by a fastener, and the other end is connected to the upright by a fastener. The two short side-fixing steel pipes are arranged symmetrically on both sides of the steel mesh. Step 3: Fix the first hook of the tensioner to a stable steel pipe on the inside of the cantilever scaffold, and fix the second hook of the tensioner to the bottom edge of the steel mesh. Adjust the adjustable screw of the tensioner to change the distance between the first hook and the second hook, thereby applying a pulling force towards the inside of the cantilever scaffold to the bottom edge, so that the bottom of the steel mesh is taut and smooth. Step 4: Lay a top sealing plate horizontally on top of the sweeping rod, so that one end of the top sealing plate overlaps the sweeping rod and the other end extends to the upper edge of the steel mesh.

8. The construction method as described in claim 7, characterized in that, The vertical offset distance H of the steel mesh relative to the sweeping rod satisfies: H≥h1+h2+δ; where h1 is the vertical distance from the center line of the sweeping rod to the top surface of the cantilevered I-beam, and its value is in the range of 150-200mm; h2 is the cross-sectional height of the cantilevered I-beam, and its value is in the range of 160-200mm; δ is the additional covering allowance of the bottom edge of the steel mesh being lower than the lower flange of the cantilevered I-beam, and δ is not less than 50mm.

9. The construction method as described in claim 7, characterized in that, The number of tensioners is two, and the two tensioners are symmetrically arranged on the bottom frame along the vertical center line of the steel mesh. The angle between the line connecting the first hook and the second hook of each tensioner and the vertical direction is θ, and the angle θ is not greater than 30°. The distance between the reinforcement point and the bottom frame is d, and the vertical offset distance of the steel mesh relative to the sweeping rod is H. Each reinforcement point is fixedly connected to the adjacent upright by a short side-fixing steel pipe. The axis of the short side-fixing steel pipe is parallel to the horizontal plane and perpendicular to the mesh surface direction of the steel mesh. The horizontal inward tension force applied by the steel pipe to the steel mesh is T; the tension applied by a single tensioner is F; the vertical distance between the reinforcement point and the upper frame is Hd; the connection point between the upper frame and the transverse rod is the moment balance fulcrum; T satisfies the following moment balance relationship: T·(Hd)≥F·sinθ·H, that is, T≥F·sinθ·H / (Hd); d is not less than 50mm, and the reinforcement point is configured to provide a horizontal inward constraint force to the bottom frame under the tension of the tensioner, so as to counteract the outward displacement tendency of the bottom frame caused by the horizontal outward component force generated by the oblique tension of the tensioner.

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