Modular assembly type steel structure cantilever protective structure and construction method thereof

Abstract

This invention discloses a modular prefabricated steel cantilevered protective structure and its construction method, belonging to the technical field of construction safety protection facilities. Each cantilevered frame structure includes a main frame body formed by the detachable connection of main and secondary keels, with a space frame laid on the main frame body. Each cantilevered frame structure is detachably connected to the outer wall through supports and fixing devices. The supports include a back plate, vertical connectors, and horizontal connectors; the fixing devices include vertical fixings, horizontal fixings, and diagonal braces; the end of the main keel closest to the outer wall is clamped between the horizontal fixings and horizontal connectors and is detachably fixed by a clamping assembly. A guardrail is installed on the side of the main frame body away from the outer wall. During construction, the cantilevered frame structure is assembled on the ground and then hoisted as a whole and locked to the supports. This invention is easy to install and disassemble, reduces high-altitude work, and improves the turnover rate of components.

Description

Technical Field

[0001] This invention belongs to the technical field of construction safety protection facilities, specifically relating to a modular prefabricated steel cantilever protection structure and its construction method. Background Technology

[0002] With the rapid development of urban construction, the number of high-rise buildings continues to increase. During the construction of high-rise buildings, accidents such as falls from heights and being struck by objects from above occur frequently, posing a serious threat to the lives of construction workers and the surrounding environment. Especially around buildings facing the street or sales showrooms, where there is high pedestrian traffic and public attention, the requirements for safety protection are even more stringent. Setting up safety protection sheds is one of the effective measures to prevent such accidents.

[0003] Currently, conventional practices for horizontal cantilever protection of high-rise buildings mainly fall into two categories. One is a soft protection system, which typically uses steel pipes suspended from external scaffolding and pulled back to the main building structure via steel wire ropes to form a flexible isolation layer. The other is a hard protection system, which usually uses I-beams as cantilever load-bearing beams, then arranges horizontal beams on the cantilever beams, and finally lays formwork to form a hard isolation. However, the above traditional practices have certain drawbacks: the cantilever length and effective coverage area of ​​the soft protection system are limited by the load-bearing capacity of the steel pipes and steel wire ropes, making it difficult to meet the protection requirements for large spans; at the same time, its overall structural stability is poor, and it is prone to deformation under wind loads and impacts. Furthermore, the erection and dismantling process involves a large amount of high-altitude edge work, posing numerous safety hazards. While the hard protection system can provide reliable impact resistance, it requires a large variety and quantity of components, and each component is heavy, making construction and installation inconvenient and complex, and difficult to adapt to the needs of rapid turnover on construction sites; especially when the owner requests the early opening of the sales area, the construction cycle of traditional hard protection often cannot respond in time.

[0004] To address the aforementioned issues, some improvement solutions exist, but certain limitations remain. For example, utility model patent CN223177180U discloses a liftable cantilevered protective shed structure; however, this device requires the installation of I-beams inside the building, which not only causes some damage to the main structure but also has a standardized design that cannot be flexibly adjusted according to actual project needs. Another example is utility model patent CN222350299U, which discloses a reusable tool-type cantilevered protective shed. While this improves the device's turnover rate to some extent, it still requires on-site welding, resulting in low construction efficiency. Furthermore, the welding connection method is not conducive to rapid disassembly and reuse, hindering its widespread application in different projects. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and to provide a modular prefabricated steel cantilever protection structure and its construction method.

[0006] The specific technical solution adopted in this invention is as follows:

[0007] In a first aspect, the present invention provides a modular prefabricated steel structure cantilevered protective structure, comprising several cantilevered frame structures that are vertically and fixedly connected to the exterior wall; each cantilevered frame structure includes a main keel, a secondary keel, a space frame, a support, a fixing device, a guardrail, and a connecting rope; the main keel and the secondary keel are detachably connected and together form the frame body, and the space frame is detachably laid on the frame body; each cantilevered frame structure is detachably connected to the exterior wall through the support and the fixing device;

[0008] Each support includes a back plate, a vertical connector, and a horizontal connector; the back plate has several through holes for fixed connection with the exterior wall; one end of the horizontal connector is vertically fixed to the back plate and extends away from the exterior wall; the vertical connector is located at the end of the horizontal connector near the back plate.

[0009] Each fixing device includes a vertical fixing member, a horizontal fixing member, and a diagonal brace; the vertical fixing member and the horizontal fixing member are arranged perpendicular to each other, and the diagonal brace is fixedly connected between the vertical fixing member and the horizontal fixing member; the vertical fixing member and the vertical connecting member are arranged side by side and are detachably connected by a first fastening component, so that the horizontal fixing members are arranged parallel and spaced above the horizontal connecting members, and the main keel parallel to and close to the side of the outer wall is arranged between the horizontal fixing member and the horizontal connecting member, and the main keel and the horizontal connecting member are detachably connected by a second fastening component;

[0010] The guardrail is detachably installed at the end of the frame body away from the outer wall; one end of the connecting rope is fixedly connected to the anchoring device embedded in the outer wall, and the other end is fixedly connected to the connecting node on the main keel.

[0011] Preferably, a number of lifting rings for connecting with hoisting equipment are welded and fixed on the main keel, and the lifting rings are spaced apart along the length of the main keel.

[0012] Preferably, the main keels that are perpendicular to each other are connected by main frame connectors to form a detachable connection method.

[0013] Preferably, the back plate is made of steel plate, and both the vertical and horizontal connectors are made of square steel pipes; the length of the vertical connector is set to 0.3~0.4 m, and the length of the horizontal connector is set to 0.3~0.5 m.

[0014] Preferably, the first fastening assembly includes a first connecting plate, a first connecting nut, a second connecting plate, a second connecting nut, and a bolt; a plurality of first connecting plates are spaced apart along the height direction on the vertical connector, and the first connecting plates extend away from the outer wall; a first connecting nut is fixed on each first connecting plate; a second connecting plate is fixed on the vertical fastener, and a second connecting nut is fixed on the second connecting plate; the first connecting nut and the second connecting nut are coaxially arranged, and the bolt passes through the first connecting nut and the second connecting nut, thus detachably connecting the vertical fastener and the vertical connector.

[0015] Preferably, the second fastening component uses a double U-shaped clamp to fix the main keel and the transverse connector.

[0016] Preferably, a transverse force transmission component is also included; the transverse force transmission component is disposed between two adjacent main keels and located on the side of the cantilever frame structure closer to the outer wall, and the two ends of the transverse force transmission component are detachably connected to the two adjacent main keels respectively.

[0017] Preferably, a support member is provided between the guardrail and the main keel of the frame body to improve stability.

[0018] Furthermore, the support component is made of galvanized pipe.

[0019] Secondly, the present invention provides a construction method for the modular prefabricated steel structure cantilevered protective structure described in the first aspect, the specific steps of which are as follows:

[0020] S1: Install the support and anchoring device at the preset position on the exterior wall;

[0021] S2: The main keel and secondary keel are detachably connected to form the main frame body, the grid frame is laid and fixed on the main frame body, and the guardrail is installed on the cantilever end of the main frame body to obtain the cantilever frame structure;

[0022] S3: Hoist the cantilever frame structure so that the end of the main keel near the outer wall rests on the horizontal connector of the support;

[0023] S4: Install a fixing device on the main keel at one end near the exterior wall, such that the vertical fixing member in the fixing device is arranged side by side with the vertical connecting member, and the two are detachably connected by the first fastening component; the horizontal fixing members in the fixing device are arranged parallel and spaced above the horizontal connecting member, and the main keel and the horizontal connecting member are detachably connected by the second fastening component, so that the main keel is held between the horizontal fixing member and the horizontal connecting member;

[0024] S5: Connect one end of the connecting rope to the connecting node on the main keel and the other end to the anchoring device on the outer wall, and adjust the tension of the connecting rope to complete the installation of the cantilever protection structure.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] (1) The present invention adopts a modular and prefabricated structural design. The main keel, secondary keel, space frame, guardrail and other components of the cantilever frame structure can be pre-processed and can be detached and connected through main frame connectors, fastening components and the like, which facilitates quick assembly on the construction site.

[0027] (2) The cantilever frame structure of the present invention can be pre-assembled on the ground and then hoisted to the corresponding position on the exterior wall by the lifting rings on the main keel, reducing high-altitude assembly and welding operations. During installation, the end of the main keel near the exterior wall is supported on the transverse connecting piece of the support and limited from above by the transverse fixing piece of the fixing device. The support and the fixing device are detachably connected by the first clamping component, and the main keel and the transverse connecting piece are detachably connected by the second clamping component, thereby realizing the rapid positioning and reliable locking of the cantilever frame structure and improving installation efficiency. At the same time, the connecting rope connects the main keel to the anchoring device on the exterior wall, and the transverse force transmission component transmits and distributes the load between adjacent main keels, which is conducive to improving the overall stability and anti-overturning ability of the cantilever frame structure.

[0028] (3) The main components of this invention are connected by detachable methods such as bolts and clamps. During installation and disassembly, there is no need to weld the main load-bearing components on site, which can reduce the damage caused by welding to the components and facilitate the overall disassembly, transportation and reuse of the cantilever frame structure. The main keel, secondary keel, support, fixing device and guardrail after disassembly can continue to be used in other projects. The general perforated steel plate protective net can also be used for external scaffolding protection or protective fences in the processing area of ​​the construction site during the idle period, thereby improving the material utilization rate, reducing material consumption and reducing construction costs. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the installation of the cantilevered protective structure provided in this embodiment;

[0030] Figure 2 This is a schematic diagram of the overall cantilever frame structure provided in this embodiment;

[0031] Figure 3 This is a schematic diagram showing the connection between the main frame connector and the main keel in this embodiment;

[0032] Figure 4 This is a schematic diagram showing the connection between the Z-shaped limiting device and the space frame in this embodiment;

[0033] Figure 5 This is a schematic diagram showing the connection between several types of limiting devices and the space frame in this embodiment;

[0034] Figure 6 This is a schematic diagram of the support in this embodiment;

[0035] Figure 7 This is a schematic diagram of the fixing device in this embodiment;

[0036] Figure 8 This is a schematic diagram showing the connection between the support and the fixing device in this embodiment;

[0037] Figure 9 This is a schematic diagram of the support structure in this embodiment;

[0038] In the diagram: 1. Main keel; 2. Secondary keel; 3. Space frame; 4. Horizontal force transmission component; 5. Support; 5-1. Back plate; 5-2. Vertical connector; 5-3. Horizontal connector; 5-4. First connecting plate; 5-5. First connecting nut; 6. Fixing device; 6-1. Vertical fixing component; 6-2. Horizontal fixing component; 6-3. Diagonal brace; 6-4. Second connecting plate; 6-5. Second connecting nut; 7. Z-type limiting device; 8. Various-type limiting device; 9. Guardrail; 10. Main frame connector; 11. Support component; 12. Anchoring device; 13. Connecting rope. Detailed Implementation

[0039] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. Technical features in the various embodiments of the present invention can be combined accordingly without mutual conflict.

[0040] In the description of this invention, it should be understood that the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include at least one of those features.

[0041] like Figure 1As shown in the figure, as a preferred embodiment of the present invention, this embodiment provides a modular prefabricated steel structure cantilevered protective structure, which is installed on the outer side of the building's exterior wall and includes several cantilevered frame structures arranged transversely along the exterior wall. Each cantilevered frame structure is assembled in a factory from prefabricated steel structure components. Anchoring devices 12 are pre-installed on the exterior wall. Each cantilevered frame structure cantilevers outward in a direction perpendicular to the exterior wall and is detachably connected to the exterior wall through supports 5 and fixing devices 6, facilitating the dismantling and reuse of the protective structure after use.

[0042] like Figure 2 As shown, each cantilevered frame structure provided in this embodiment includes a main keel 1, secondary keels 2, a space frame 3, a transverse force transmission component 4, a support 5, a fixing device 6, a Z-shaped limiting device 7, a multi-shaped limiting device 8, a guardrail 9, a main frame connector 10, a support component 11, and a connecting rope 13. In this embodiment, each cantilevered frame structure is provided with four main keels 1, including two transverse main keels parallel to the outer wall and two longitudinal main keels perpendicular to the outer wall. Secondary keels 2 are provided between the main keels 1. The main keels 1 and secondary keels 2 are detachably connected and together form the main frame body. The space frame 3 is detachably laid on the main frame body. The guardrail 9 is detachably installed at the cantilever end of the main frame body away from the outer wall.

[0043] In this embodiment, the main keel 1 is made of square steel tubes with a cross-sectional dimension of 100 mm × 60 mm, and is available in two lengths: 3.6 m and 2.4 m. The 3.6 m main keel 1 serves as the longitudinal main keel, positioned on both sides of the cantilevered frame structure and extending away from the exterior wall. Through holes are provided at predetermined positions at both ends and the middle of this main keel 1. Three zig-shaped lifting rings are welded at intervals along the length of its upper surface for connection to the hoisting equipment during the overall hoisting of the cantilevered frame structure. Three flat steel connecting parts are welded at intervals along the length of its lower surface. The 2.4 m main keel 1 is positioned transversely, serving as the transverse main keel for connecting the longitudinal main keels on both sides. Through holes are also provided at predetermined positions at both ends and the middle of the transverse main keel, and three flat steel connecting parts are welded at intervals along the length of its lower surface. On the transverse main keel located at the end of the cantilevered frame structure away from the exterior wall, three 50 mm × 50 mm square steel tube connecting seats are also welded at intervals for installing the guardrail 9. Thus, the longitudinal main keel and the transverse main keel together form the main load-bearing frame of the main body of the frame.

[0044] like Figure 3As shown, the mutually perpendicular main keels 1 are detachably connected by main frame connectors 10. The main frame connectors 10 are formed by welding adjacent square steel tubes with cross-sectional dimensions of 90 mm × 60 mm and 30 mm × 60 mm. An L-shaped steel plate is welded to the upper and lower ends of each main frame connector 10, and two round holes are formed at each end of each L-shaped steel plate. During assembly, the main frame connectors 10 are positioned at the connection points of the mutually perpendicular main keels 1 and locked using fasteners passing through the corresponding round holes, allowing for quick assembly of the main keels 1 and facilitating subsequent disassembly.

[0045] In this embodiment, the secondary keel 2 is made of square steel tubes with a cross-sectional dimension of 40 mm × 40 mm, and is available in two length specifications of 3.66 m and 1.21 m, serving as longitudinal and transverse secondary keels respectively. Four flat steel connecting parts are welded at intervals to the lower surface of the longitudinal secondary keel, with two L60×5 angle steels welded to each end, and connection holes are provided on the angle steels. Similarly, two flat steel connecting parts are welded at intervals to the lower surface of the transverse secondary keel, with two L60×5 angle steels with connection holes welded to each end. Each secondary keel 2 is arranged between the main keels 1 according to the design position and is detachably connected to the main keels 1 through angle steels, connection holes, and corresponding fasteners, thus forming together with the main keels 1 the main frame structure capable of supporting the space frame 3.

[0046] In this embodiment, the space frame 3 is welded from square steel tubes with a cross-sectional dimension of 20 mm × 20 mm and perforated plates, with each space frame 3 measuring 1.2 m × 1.8 m. Several space frames 3 are sequentially laid on the frame body formed by the main keel 1 and secondary keel 2, with the edges of adjacent space frames 3 interlocking to form a continuous protective bearing surface. To prevent the space frame 3 from moving relative to the frame body during use, Z-shaped limiting devices 7 and multi-shaped limiting devices 8 are installed at the edges of the space frame 3. The Z-shaped limiting device 7 is made of 40 mm × 3 mm flat steel bent into a Z shape, with a round hole at one end; the multi-shaped limiting device 8 is made of 40 mm × 3 mm flat steel bent into a multi-shaped form, with a round hole in the middle. The Z-shaped limiting device 7 and the multi-shaped limiting device 8 are respectively installed at corresponding positions on the frame body using fasteners to provide detachable limiting for the space frame 3, specifically as follows... Figure 4 and Figure 5 As shown.

[0047] In the structure provided by this invention, the support 5 is used to support the end of the cantilever frame structure near the outer wall. For example... Figure 6As shown, each support 5 includes a back plate 5-1, a vertical connector 5-2, a horizontal connector 5-3, a first connecting plate 5-4, and a first connecting nut 5-5. One end of the horizontal connector 5-3 is vertically fixed to the back plate 5-1 and extends away from the outer wall; the vertical connector 5-2 is located at the end of the horizontal connector 5-3 near the back plate 5-1.

[0048] In this embodiment, the back plate 5-1 is made of a steel plate with dimensions of 250 mm × 250 mm and a thickness of 12 mm. Four circular through holes are made at a distance of 40 mm from each edge of the back plate 5-1. During installation, the back plate 5-1 is attached to the surface of the exterior wall and fixedly connected to the exterior wall by anchors passing through the through holes. In this embodiment, the horizontal connector 5-3 is made of a square steel tube with a cross-sectional dimension of 100 mm × 100 mm and a length of 0.4 m. One end of the horizontal connector 5-3 is vertically welded to the middle of the back plate 5-1 and extends from the back plate 5-1 in a direction away from the exterior wall. The vertical connector 5-2 is made of a square steel tube with a cross-sectional dimension of 60 mm × 60 mm and a length of 0.35 m. Its lower end is welded to the end of the horizontal connector 5-3 near the back plate 5-1, so that the vertical connector 5-2 extends in a vertical direction. The horizontal connector 5-3 forms a lower support for supporting the main keel 1, while the vertical connector 5-2 is used to connect with the fixing device 6.

[0049] In the structure provided by this invention, the fixing device 6 is disposed above the horizontal main keel on the side close to the outer wall. For example... Figure 7 As shown, each fixing device 6 includes a vertical fixing member 6-1, a horizontal fixing member 6-2, a diagonal brace 6-3, a second connecting plate 6-4, and a second connecting nut 6-5. In this embodiment, both the vertical fixing member 6-1 and the horizontal fixing member 6-2 are made of square steel tubes with a cross-sectional dimension of 60 mm × 60 mm and are welded perpendicularly to each other; the diagonal brace 6-3 is inclinedly connected between the vertical fixing member 6-1 and the horizontal fixing member 6-2, so that the fixing device 6 as a whole forms a triangular force-bearing structure to improve stability.

[0050] When assembling the support 5 and the fixing device 6, first place the horizontal main keel closest to the outer wall onto the horizontal connector 5-3 of the support 5. Then, place the fixing device 6 above the horizontal main keel, so that the vertical fixing member 6-1 and the vertical connector 5-2 are arranged side by side, and the horizontal fixing member 6-2 is parallel and spaced above the horizontal connector 5-3. Thus, the horizontal main keel is located between the horizontal fixing member 6-2 and the horizontal connector 5-3, with the horizontal connector 5-3 supporting the horizontal main keel from below, and the horizontal fixing member 6-2 limiting the horizontal main keel from above. Specifically... Figure 8 As shown.

[0051] The vertical fixing member 6-1 and the vertical connecting member 5-2 are detachably connected by a first locking assembly. Specifically, four first connecting plates 5-4, each 120 mm × 30 mm in size and 6 mm thick, are welded at intervals along the height direction at the upper end of the vertical connecting member 5-2. Each first connecting plate 5-4 is welded with an M16 first connecting nut 5-5. On each side of the vertical fixing member 6-1 of the fixing device 6, a second connecting plate 6-4, each 60 mm × 30 mm in size and 6 mm thick, is welded. Each second connecting plate 6-4 is welded with an M16 second connecting nut 6-5. After assembling the fixing device 6 onto the support 5, the corresponding first connecting nut 5-5 and second connecting nut 6-5 are coaxially aligned. Bolts are then passed through and locked to the corresponding first connecting nut 5-5 and second connecting nut 6-5, thereby detachably connecting the vertical fixing member 6-1 and the vertical connecting member 5-2.

[0052] The transverse main keel and the transverse connecting member 5-3 are detachably connected by a second fastening assembly. In this embodiment, the second fastening assembly uses a double U-shaped clamp, which surrounds and locks the transverse main keel and the transverse connecting member 5-3, so that the transverse main keel is fitted and fixed to the transverse connecting member 5-3. The first and second fastening assemblies work together to stably hold the transverse main keel between the transverse fixing member 6-2 and the transverse connecting member 5-3, and can be separated from the support 5 and the fixing device 6 after the bolts and double U-shaped clamps are removed.

[0053] To enhance the cooperative load-bearing capacity of adjacent main joists 1 at the cantilever root, a transverse force-transferring member 4 is installed between two adjacent main joists 1. The transverse force-transferring member 4 is located on the side of the cantilever frame structure closest to the exterior wall. In this embodiment, the transverse force-transferring member 4 is made of a square steel tube with a cross-sectional dimension of 40 mm × 40 mm and a length of 2.46 m. ​​An L40 × 3 angle steel is welded to each end of the tube, and a connection hole is provided on each angle steel. The two ends of the transverse force-transferring member 4 are detachably connected to the two adjacent main joists 1 through the angle steel and fasteners passing through the connection holes. The transverse force-transferring member 4 can transfer and distribute the local load acting on the cantilever frame structure between adjacent main joists 1, limiting the relative displacement and torsional deformation between adjacent main joists 1, thereby improving the overall stiffness of the frame structure.

[0054] The guardrail 9 is located at the end of the frame body away from the outer wall. In this embodiment, the guardrail 9 is made of square steel pipes with a cross-sectional size of 40 mm × 40 mm and a wall thickness of 3 mm, welded together with perforated plates, and its overall dimensions are 0.6 m × 2.54 m. Three square steel pipe connecting sections, each 120 mm long, with a cross-sectional size of 40 mm × 40 mm and a wall thickness of 3 mm, are welded at intervals to the lower end of the guardrail 9. During installation, the three square steel pipe connecting sections are inserted into the corresponding 50 mm × 50 mm square steel pipe connecting seats on the 2.4 m main keel 1 at the cantilever end, thereby achieving detachable installation of the guardrail 9 from the frame body.

[0055] like Figure 9 As shown, a support member 11 is also provided between the guardrail 9 and the main keel 1 of the frame body. In this embodiment, the support member 11 is made of DN15 galvanized pipe, with steel plates of 6 mm thickness attached to both ends, and round holes are opened in the steel plates. One end of the support member 11 is connected to the guardrail 9 by fasteners, and the other end is connected to the main keel 1 by fasteners, thereby forming an oblique support for the guardrail 9 and reducing the shaking of the guardrail 9 when subjected to external forces.

[0056] Anchoring devices 12 are also installed on the exterior wall. In this embodiment, the anchoring device 12 is made of M20 round steel bent into a figure-6 shape, and uses the pre-embedded sleeve holes formed during the construction of the main building as anchoring points, and is anchored by steel plates and nuts. The connecting rope 13 is a steel wire rope used in construction. One end of the connecting rope 13 is fixedly connected to the anchoring device 12, and the other end is fixedly connected to a preset connection node on the main keel 1. After adjusting the tension of the connecting rope 13, the connecting rope 13 can form an oblique tie to the cantilever frame structure, and together with the support 5 and the fixing device 6, it constitutes the connection system between the cantilever frame structure and the exterior wall.

[0057] It should be noted that the present invention does not impose specific limitations on the specific dimensions and material selection of each component, and those skilled in the art can make reasonable selections based on the actual working conditions of the construction site.

[0058] Next, this embodiment also provides a construction method for the above-mentioned modular prefabricated steel structure cantilever protection structure, as follows:

[0059] First, the location and installation height of the cantilevered protective structure are determined based on the building's outer contour, engineering protection requirements, and site environment. Standard and non-standard protective units are then defined in the site plan. Based on the layout, component fabrication drawings and detailed installation node drawings are created. Simultaneously, the cantilevered frame structure is structurally verified, and the load-bearing capacity of each component and the strength of the anchorage points under wind load conditions are calculated.

[0060] Subsequently, according to the detailed design drawings, the main keel 1, secondary keel 2, space frame 3, transverse force transmission components 4, supports 5, fixing devices 6, guardrails 9, main frame connectors 10, and support components 11 were prefabricated in the factory. After the processing of each steel structure component, rust removal and anti-corrosion treatment were carried out. After the welded parts passed the inspection, they were uniformly sprayed with eye-catching blue protective paint to improve the durability of the components and facilitate on-site identification.

[0061] After the prefabricated components are transported to the construction site and pass inspection, they are assembled in the on-site assembly area according to the design drawings. First, the main keel 1 is assembled to form the main load-bearing frame using the main frame connector 10 and corresponding fasteners. Then, the secondary keel 2 is installed between the corresponding main keels 1 to form the main frame body. Then, each piece of space frame 3 is laid on the main frame body in sequence, and Z-type limiting device 7 and multi-type limiting device 8 are installed to limit the space frame 3. After that, the transverse force transmission component 4 is installed on the side of the adjacent main keel 1 near the outer wall.

[0062] After assembling the main frame and the space frame 3, install the guardrail 9 at the cantilevered end of the main frame and install the support 11 between the guardrail 9 and the main keel 1. When it is necessary to set up advertising cloth or warning signs on the outside of the cantilevered protective structure, they can be laid or connected to the perforated plate of the guardrail 9.

[0063] During the main building construction phase, the axis lines and elevation control lines of the supports 5 and anchoring devices 12 are marked at the corresponding positions on the exterior wall according to the construction drawings, and the positioning and installation of supports 5 and anchoring devices 12 are completed according to the control lines. When hoisting the cantilever frame structure, the hoisting equipment connects to the Z-shaped lifting rings on the main keel 1, and under the command of a designated person, the assembled cantilever frame structure is lifted to the installation position, so that the end of the main keel 1 closest to the exterior wall rests on the transverse connecting piece 5-3 of the support 5.

[0064] After the cantilever frame structure is in place and adjusted to fit tightly against the support 5, the fixing device 6 is installed above the main keel 1. The vertical fixing member 6-1 and the vertical connecting member 5-2 are locked together by the first locking component, and the main keel 1 and the horizontal connecting member 5-3 are locked together by the double U-shaped clamps, so that the main keel 1 is held between the horizontal fixing member 6-2 and the horizontal connecting member 5-3. Then, the connecting rope 13 is laid out according to the design position, and its two ends are connected to the connecting node on the main keel 1 and the anchoring device 12 on the outer wall, respectively, and the tension of the connecting rope 13 is adjusted.

[0065] After installation, the following checks are conducted: the tightness of the connection between the main keel 1, secondary keel 2 and main frame connector 10; the laying and limiting status of the space frame 3; the locking status of the support 5 and fixing device 6; the installation status of the guardrail 9 and support 11; and the tying status of the connecting rope 13 and anchoring device 12. The overall dimensions, flatness and overturning stability of the cantilevered protective structure are also checked. After passing the inspection, the structure is put into use.

[0066] After use, first clean up any debris on the space frame 3, and set up warning and safety barriers in the dismantling area. During dismantling, first disconnect the connection between the connecting rope 13 and the anchoring device 12, then remove the first clamping component, the fixing device 6, and the double U-shaped clamps used to fix the main keel 1 and the transverse connecting parts 5-3; then use hoisting equipment to connect the lifting rings on the main keel 1, and slowly hoist the cantilever frame structure to the ground assembly area, and then dismantle the guardrail 9, support 11, space frame 3, transverse force transmission parts 4, secondary keel 2, and main keel 1 in sequence. After dismantling, the components can be inspected and maintained, then classified and stored for use in subsequent projects.

[0067] Through the aforementioned structure and installation method, the main components of the cantilevered protective structure can be prefabricated in a standardized manner in the factory and assembled on the construction site using detachable connectors such as bolts and clamps. The support 5 and fixing device 6 provide upper and lower limits and clamps to the end of the main keel 1 closest to the outer wall, while the connecting rope 13 further forms an oblique tie; the transverse force transmission component 4 ensures that adjacent main keels 1 share the force collaboratively at the cantilever root. Thus, while ensuring the connection stability of the cantilevered protective structure, on-site welding work can be reduced, and overall hoisting, disassembly, and reuse are facilitated.

[0068] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of the present invention.

Claims

1. A modular prefabricated steel cantilever protection structure, characterized in that, It includes several cantilevered frame structures that are vertically and fixedly connected to the exterior wall; each cantilevered frame structure includes a main keel (1), a secondary keel (2), a space frame (3), a support (5), a fixing device (6), a guardrail (9), and a connecting rope (13); the main keel (1) and the secondary keel (2) are detachably connected and together form the main frame body, and the space frame (3) is detachably laid on the main frame body; each cantilevered frame structure is detachably connected to the exterior wall through the support (5) and the fixing device (6); Each support (5) includes a back plate (5-1), a vertical connector (5-2), and a horizontal connector (5-3); the back plate (5-1) has several through holes for fixed connection with the exterior wall; one end of the horizontal connector (5-3) is vertically fixed to the back plate (5-1) and extends away from the exterior wall; the vertical connector (5-2) is located at the end of the horizontal connector (5-3) near the back plate (5-1); Each fixing device (6) includes a vertical fixing member (6-1), a horizontal fixing member (6-2), and a diagonal brace (6-3); the vertical fixing member (6-1) and the horizontal fixing member (6-2) are arranged perpendicularly to each other, and the diagonal brace (6-3) is fixedly connected between the vertical fixing member (6-1) and the horizontal fixing member (6-2); the vertical fixing member (6-1) and the vertical connecting member (5-2) are arranged side by side and are detachably connected by a first fastening component, so that the horizontal fixing member (6-2) is arranged parallel and spaced above the horizontal connecting member (5-3), and the main keel (1) parallel and close to the side of the outer wall is arranged between the horizontal fixing member (6-2) and the horizontal connecting member (5-3), and the main keel (1) and the horizontal connecting member (5-3) are detachably connected by a second fastening component; The guardrail (9) is detachably installed at the end of the frame body away from the outer wall; one end of the connecting rope (13) is fixedly connected to the anchoring device (12) embedded in the outer wall, and the other end is fixedly connected to the connecting node on the main keel (1).

2. The modular prefabricated steel cantilever protection structure according to claim 1, characterized in that, Several lifting rings for connecting with hoisting equipment are welded and fixed on the main keel (1), and the lifting rings are spaced apart along the length of the main keel (1).

3. The modular prefabricated steel cantilever protection structure according to claim 1, characterized in that, The main keels (1) that are perpendicular to each other are connected by a detachable connection method through the main frame connector (10).

4. The modular prefabricated steel structure cantilever protection structure according to claim 1, characterized in that, The back plate (5-1) is made of steel plate, and the vertical connector (5-2) and the horizontal connector (5-3) are both made of square steel pipe; the length of the vertical connector (5-2) is set to 0.3~0.4 m, and the length of the horizontal connector (5-3) is set to 0.3~0.5 m.

5. The modular prefabricated steel cantilever protection structure according to claim 1, characterized in that, The first fastening assembly includes a first connecting plate (5-4), a first connecting nut (5-5), a second connecting plate (6-4), a second connecting nut (6-5), and a bolt; the vertical connector (5-2) is provided with a plurality of first connecting plates (5-4) spaced apart along the height direction, and the first connecting plates (5-4) extend away from the outer wall; a first connecting nut (5-5) is fixed on each first connecting plate (5-4); a second connecting plate (6-4) is fixed on the vertical fastener (6-1), and a second connecting nut (6-5) is fixed on the second connecting plate (6-4); the first connecting nut (5-5) and the second connecting nut (6-5) are coaxially arranged, and the bolt passes through the first connecting nut (5-5) and the second connecting nut (6-5), thus detachably connecting the vertical fastener (6-1) and the vertical connector (5-2).

6. The modular prefabricated steel cantilever protection structure according to claim 1, characterized in that, The second fastening component uses a double U-shaped clamp to fix the main keel (1) and the transverse connector (5-3) together.

7. The modular prefabricated steel structure cantilever protection structure according to claim 1, characterized in that, It also includes a transverse force transmission component (4); the transverse force transmission component (4) is disposed between two adjacent main keels (1) and located on the side of the cantilever frame structure close to the outer wall, and the two ends of the transverse force transmission component (4) are detachably connected to the two adjacent main keels (1).

8. The modular prefabricated steel structure cantilever protection structure according to claim 1, characterized in that, A support member (11) is provided between the guardrail (9) and the main keel (1) of the frame body to improve stability.

9. The modular prefabricated steel structure cantilever protection structure according to claim 8, characterized in that, The support component (11) is made of galvanized pipe.

10. A construction method for a modular prefabricated steel structure cantilever protection structure as described in any one of claims 1 to 9, characterized in that, The specific steps are as follows: S1: Install the support (5) and anchoring device (12) at the preset position on the exterior wall; S2: The main keel (1) and the secondary keel (2) are detachably connected to form the frame body, the grid frame (3) is laid and fixed on the frame body, and the guardrail (9) is installed on the cantilever end of the frame body to obtain the cantilever frame structure; S3: Hoist the cantilever frame structure so that the end of the main keel (1) near the outer wall is placed on the transverse connector (5-3) of the support (5); S4: Install a fixing device (6) above the main keel (1) near the outer wall, so that the vertical fixing member (6-1) in the fixing device (6) and the vertical connecting member (5-2) are arranged side by side, and the two are detachably connected by the first fastening component; the horizontal fixing member (6-2) in the fixing device (6) is arranged parallel to the horizontal connecting member (5-3) above, and the main keel (1) and the horizontal connecting member (5-3) are detachably connected by the second fastening component, so that the main keel (1) is held between the horizontal fixing member (6-2) and the horizontal connecting member (5-3); S5: Connect one end of the connecting rope (13) to the connecting node on the main keel (1) and the other end to the anchoring device (12) on the outer wall, and adjust the tightness of the connecting rope (13) to complete the installation of the cantilever protection structure.

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