Disclosed are a fast-mounting cantilever square steel system special for a disc buckle type scaffold and a construction method thereof

Abstract

This invention relates to the technical field of construction scaffolding, and discloses a quick-assembly cantilevered square steel system for disc-lock scaffolding and its construction method. The system includes a cantilevered main square steel, sliding connectors, embedded sleeves, an upper fixing plate, a lower fixing plate, and tie rods. The embedded sleeves are pre-embedded in the concrete exterior wall, and the cantilevered main square steel is fixed to the concrete exterior wall and cantilevered outwards. The sliding connectors are slidably fitted onto the cantilevered main square steel and can move axially to adjust the installation position. The upper and lower fixing plates are respectively anchored to corresponding elevation positions on the concrete exterior wall via double-ended bolts and nuts, forming anchoring bases for the upper tie and lower support. The tie rods connect the sliding connectors to the upper and lower fixing plates. This invention perfectly matches modern disc-lock scaffolding, featuring lightweight, adjustable, highly integrated, easy installation, and reusable characteristics, and effectively improves construction safety and economy.

Description

Technical Field

[0001] This invention relates to the technical field of construction scaffolding, and in particular to a quick-assembly cantilever square steel system for disc-lock scaffolding and its construction method. Background Technology

[0002] Currently, cantilevered scaffolding is a widely used technology in building construction, providing necessary operating platforms and safety enclosures for the main structure construction and exterior wall decoration of high-rise or super high-rise buildings. The most common and traditional cantilevered scaffolding system in existing technology mainly consists of a combination of coupler-type steel pipe scaffolding and cantilevered I-beams. The basic operating mode of this traditional system is to use hot-rolled I-beams (usually 16# to 20#) as the cantilevered load-bearing main beams. One end is fixed by steel ring clamps embedded in the building structure or by pre-embedded bolts, while the other end cantilevers out of the building structure to form the supporting foundation of the external scaffolding. Then, double or multiple rows of coupler-type steel pipe scaffolding are erected on the I-beams and fastened with bolts to form the scaffolding structure.

[0003] However, this traditional technical solution has many inherent defects and limitations in practical applications. First, in terms of materials and construction methods, the coupler-type scaffolding itself has low erection efficiency, coupler bolts are easily lost, tightening operations are cumbersome and the quality is greatly affected by human factors, making it difficult to guarantee the reliability of nodes; at the same time, material consumption is high, turnover is low, and the overall economic efficiency is poor. Furthermore, I-beam cantilever beams, as heavy steel materials, have a large weight per beam, and installation and dismantling require large machinery such as tower cranes, making transportation difficult and occupying machinery shifts, increasing construction costs and time. The pre-embedded steel reinforcement rings are usually left in the concrete after dismantling and cannot be recycled, resulting in serious steel waste.

[0004] Secondly, the cantilever structure itself is rigid, lacking flexibility and adaptability. The spacing and cantilever length of traditional cantilevered I-beams are fixed and cannot be adjusted. The fixed unloading point at the top forces the scaffolding uprights to strictly correspond to the pre-set positions of the I-beams, greatly limiting the flexibility of scaffolding row and step spacing. When the building facade changes or needs to provide support for other construction processes (such as erecting protective sheds or construction corridors), the traditional rigid cantilever system is difficult to adapt, often requiring redesign and installation of additional cantilever beams, leading to low construction efficiency.

[0005] Furthermore, the system has multiple hidden dangers in terms of quality and safety. The I-beams need to penetrate the openings in the exterior wall, damaging the wall formwork. Improper sealing can easily lead to leaks in the exterior wall. Modern residential buildings mostly have all-concrete exterior wall structures, and the need to drill holes in the formwork for the penetrating I-beams further increases wear and tear. Unloading is generally done using diagonal steel wire ropes, making it difficult to precisely control and inspect the tightening force of the turnbuckles, posing a risk of failure due to loosening. The entire system lacks an effective real-time safety monitoring mechanism, such as early warnings for levelness and stress status. Safety hazards largely rely on manual inspection, resulting in insufficient reliability.

[0006] Finally, traditional cantilever systems have low levels of standardization and integration. They are assembled on-site from scattered components such as I-beams, steel pipes, fasteners, and wire ropes, and are not integrated product systems, resulting in low standardization of installation quality. In particular, they have poor compatibility with the modular, tool-based, and highly efficient new systems such as disc-lock scaffolding widely promoted in the current construction industry, and cannot leverage the advantages of disc-lock scaffolding, such as quick assembly and disassembly, safety, and stability.

[0007] Therefore, there is an urgent need in this field for a new type of cantilever scaffolding load-bearing system that can overcome the above-mentioned defects. Summary of the Invention

[0008] Based on the shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide a quick-installation cantilever square steel system for disc-lock scaffolding and its construction method, which can be perfectly matched with modern disc-lock scaffolding, and has the characteristics of being lightweight, adjustable, highly integrated, easy to install, and reusable, and can effectively improve construction safety and economy.

[0009] To achieve the above objectives, the present invention employs the following technical measures: The present invention relates to a quick-assembly cantilever square steel system for disc-lock scaffolding, comprising a cantilever main square steel, a sliding connector, a pre-embedded sleeve, an upper fixing plate, a lower fixing plate, and a bracing rod. The pre-embedded sleeve is pre-installed in the concrete exterior wall, and one end of a double-ended threaded rod is screwed into the pre-embedded sleeve. A circular hole is provided at the end of the cantilever main square steel near the concrete exterior wall; the other end of the double-ended threaded rod passes through this hole and is secured with a nut, thus fixing the cantilever main square steel to the concrete exterior wall and allowing it to cantilever outwards. The sliding connector has a shape that corresponds to the outer contour of the cantilever main square steel. The fitting sleeve structure allows it to slide onto the cantilevered main square steel and move axially to adjust its installation position. The sliding connector includes a main frame whose inner contour matches the outer diameter of the square steel tube of the cantilevered main square steel; two pull rings vertically welded to the upper and lower surfaces of the main frame; shafts vertically welded to the geometric centers of the upper and lower surfaces of the main frame; and a laser pointer sleeve disposed on the upper outer side of one side of the main frame. The shaft has a through-hole for inserting the disc-lock uprights of the disc-lock scaffolding. The upper fixing plate includes a first base plate, first flanges located on both sides of the first base plate, a first rectangular steel plate located at the upper end of the upper fixing plate and the first flanges, and a pair of double-ear holes welded to the first rectangular steel plate. Multiple "7"-shaped slots are evenly distributed on the two first flanges. The lower fixing plate includes a second base plate, second flanges located on both sides of the second base plate, and a second rectangular steel plate located at the upper end of the second base plate and the second flanges. Multiple slots with a downward inclination of 45° are evenly distributed on the two second flanges. The upper and lower fixing plates are anchored to the corresponding elevation positions of the concrete exterior wall by double-ended screws and nuts, forming the anchoring base points for the upper tie and the lower support. The bracing rod is connected between the sliding connector and the upper and lower fixing plates. One end of the bracing rod is connected to the pull ring on the sliding connector by an ultra-short bolt, and the other end is connected and locked to the "7" shaped slot on the upper fixing plate or the straight slot on the lower fixing plate by a rod limiting bolt, forming a stable triangular support system.

[0010] Preferably, the pre-embedded sleeve is a steel cylindrical component, which includes a support ring, a cylinder body, double hook rings, and friction rings; the cylinder body is welded to the rear axial center of the support ring; the inner surface of the cylinder body is threaded throughout for screwing into a double-ended screw; a closed end cap is provided at the end of the cylinder body away from the support ring, and the double hook ring is sleeved on the outer periphery of the cylinder body near the closed end. The double hook ring includes an annular body and a pair of metal hooks symmetrically welded to its outer side, forming an overall arc-shaped structure, used to hook the surrounding reinforcing bars for additional fixation; multiple friction rings are also welded at intervals along the axial spacing of the cylinder body on the outer surface of the cylinder body to enhance the gripping force and pull-out resistance with the concrete.

[0011] Furthermore, the cantilevered main square steel is composed of a square steel tube, an anchor plate, and a supporting triangular iron. A rectangular anchor plate is vertically welded to the tail end of the square steel tube. The upper and lower edges of the anchor plate are respectively provided with three-section circular connecting sections. A supporting triangular iron is also provided near the anchor plate at the tail end of the square steel tube. Two round holes for inserting double-ended bolts are opened on the upper part of the anchor plate. Multiple first horizontal central axis through holes for installing square steel limit bolts are opened on the central axis of the side of the square steel tube.

[0012] Furthermore, it also includes a square tube central shaft and an extended square rod section. The square tube central shaft includes a three-section structure, with the cross-sectional dimensions of its two end sections suitable for insertion into the inner cavity of the cantilevered main square steel. The cross-sectional dimensions of its middle section are consistent with those of the cantilevered main square steel to achieve axial limiting. The cross-section of the extended square rod section is consistent with that of the cantilevered main square steel and is inserted into the far end of the square tube central shaft, together forming an extension structure of the cantilevered load-bearing body. This extension structure is locked through by square steel limiting bolts to ensure connection strength and overall stability.

[0013] Preferably, the central shaft of the square tube consists of a main square tube and a rectangular sleeve. The outer diameter of the main square tube matches the inner diameter of the cantilevered main square steel and is inserted into the end of the cantilevered main square steel to achieve axial extension. Second horizontal central shaft through holes are opened on the main square tube at distances of 100mm and 200mm from both ends of the rectangular sleeve, respectively, for passing through square steel limiting bolts and fixing them to the cantilevered main square steel. The rectangular sleeve is fixedly set in the middle of the main square tube, and its cross-sectional dimensions are consistent with the cross-section of the cantilevered main square steel, for providing centering and limiting at the connection and enhancing bending stiffness. After assembly, the main square tube extends 300mm from each side of the rectangular sleeve to form a reliable insert-type connection section, which together constitutes a detachable cantilever structure extension component.

[0014] Furthermore, the extended square rod segment is a rectangular square tube structure with the same cross-sectional dimensions as the cantilevered main square steel, used to connect with the central axis of the square tube to extend the cantilever span; on the extended square rod segment, a third horizontal central axis through hole is provided at a distance of 100mm and 200mm from both ends and at the center of the square tube, respectively, for the square steel limiting bolt to pass through, so as to achieve reliable fixation and axial positioning of the extended square rod segment and the adjacent connecting parts.

[0015] Preferably, the device also includes a warning plate, which is a red rectangular plate with a width matching the gap between the two ear holes and a cylindrical counterweight at its tail end. The warning plate is hinged between the two ear holes via a perforated shaft and rotates 90° around the perforated shaft, with its head end flush with the first base plate of the upper fixing plate and a pin in the middle of that end. A semi-circular hole is opened in the middle of the longitudinal axis of the first base plate at the bottom end of the first rectangular steel plate. When the upper fixing plate is installed close to the concrete exterior wall, the pin at the head end of the warning plate is inserted into the semi-circular hole of the first base plate and, under the friction constraint of the exterior wall, overcomes the torque of the counterweight, keeping the warning plate in a horizontal storage state. If a loose gap appears between the upper fixing plate and the concrete exterior wall, the pin will disengage from the semi-circular hole and the wall, losing friction constraint. At this time, the counterweight drives the warning plate to rotate around the perforated shaft to a vertical state, forming a conspicuous visual warning.

[0016] Furthermore, the support rod is assembled from a support rod head, a cylindrical cylindrical tube, and an extended cylindrical tube section to form an adjustable rod. The support rod head consists of an earring pull head cover and a cylindrical steel tube. One end of the cylindrical steel tube is machined with outward-facing thread rolling for adjusting the overall length of the support rod by rotation, while the other end is fitted onto the earring pull head cover. The earring pull head cover is a circular metal cap with a pull ring welded to its upper end. The pull ring consists of a straight line segment and a semi-circular arc, with a pull ring hole in the center for a rod-mounting bolt or an ultra-short bolt to pass through. The entire inner diameter of the cylindrical cylindrical tube is machined with internal threads, the thread size of which matches the size of the outward-facing thread rolling on the cylindrical steel tube of the support rod head. The two support rod heads are screwed into the cylindrical cylindrical tube from both ends, and the extension length is adjusted by rotation to achieve an overall support rod length ranging from 2800mm to 3600mm. The length can be adjusted steplessly within a range of mm; a radial through hole is provided on the side wall of the middle section of the cylindrical tube for inserting an iron rod or special tool to assist rotation, facilitating force application and positioning during adjustment; the extended cylindrical tube section includes a solid cylindrical bar section and a hollow cylindrical tube section, the end face of the solid cylindrical bar section is coaxially aligned and fixedly connected with the beginning end face of the hollow cylindrical tube section, so that the axis of the solid cylindrical bar section coincides with the axis of the hollow cylindrical tube section, together forming a continuous extended shaft; the inner hole of the hollow cylindrical tube section is machined with internal threads along its entire length, the size of which matches the size of the external convex thread of the cylindrical steel tube of the bracing rod head; the solid cylindrical bar section is a solid cylindrical bar, the outer diameter of which is consistent with the outer diameter of the cylindrical steel tube of the bracing rod head, and the solid cylindrical bar section is machined with external convex thread along its entire length and screwed into the cylindrical tube.

[0017] Furthermore, the bottom surface of the upper fixing plate is provided with a first two-section annular connecting section, which is used to engage with the three-section annular connecting section at the end of the anchor plate of the cantilever main square steel; the top surface of the lower fixing plate is provided with a second two-section annular connecting section, which is used to engage with the three-section annular connecting section at the end of the anchor plate of the cantilever main square steel.

[0018] Accordingly, the present invention also provides a construction method for a special quick-assembly cantilever square steel system for disc-lock scaffolding, the steps of which are as follows: S1: After the wall reinforcement is tied and the shear wall formwork is ready to be closed, positioning holes are drilled in the formwork for the later installation of the cantilevered main square steel, upper fixing plate, and lower fixing plate. Then, a double-ended threaded rod is passed through the drilled holes in the formwork and screwed into the embedded sleeve. Next, the matching nut is screwed into the other end of the double-ended threaded rod and locked. By tightening the nut, the support ring of the embedded sleeve and the nut of the double-ended threaded rod are tightly fitted to the inner and outer surfaces of the formwork, thereby achieving precise positioning and fixing of the embedded sleeve. The double hook ring of the embedded sleeve is designed to hook onto the longitudinal and transverse reinforcement in the wall to enhance its pull-out resistance. Finally, the concrete of the shear wall is poured. After the concrete strength meets the requirements, the nuts at both ends of the double-ended threaded rod are loosened and removed, and the double-ended threaded rod is unscrewed from the embedded sleeve and the formwork to remove the formwork. S2: After the formwork is removed, install the double-ended threaded rods of the cantilevered main square steel in groups of two. Install the double-ended threaded rods of the upper fixing plate in groups of three, with equal spacing, exposed on the exterior wall. Then, pass the round holes on the anchor plates of the cantilevered main square steel through the double-ended threaded rods. Finally, install the nuts that come with each double-ended threaded rod and screw them in to firmly attach the anchor plates to the exterior wall, thus completing the installation of the entire cantilevered main square steel of the scaffold. The installation method of the upper fixing plates is the same. S3: For the installation of cantilevered main square steel, upper fixing plate and lower fixing plate at the corner of the building, it is necessary to process them into external corner cantilevered main square steel, external corner upper fixing plate and external corner lower fixing plate; compared with the cantilevered main square steel, the external corner anchor plate of the external corner cantilevered main square steel is processed into an external corner shape to fit the external corner wall surface, and the rest are the same; the first external corner bottom plate of the external corner upper fixing plate and the second external corner bottom plate of the external corner lower fixing plate are processed into 90° bent right angles to fit the external corner wall surface; the third elongated oval hole of the external corner upper fixing plate and the fourth elongated oval hole of the external corner lower fixing plate are added to each external corner upper fixing plate and external corner lower fixing plate, that is, the external corner upper fixing plate and external corner lower fixing plate have two elongated oval holes reserved on each external corner wall surface, and the height positions are staggered; S4: Install two sliding connectors on the square steel tube of each cantilevered main square steel; slide the two sliding connectors onto the square steel tube of the cantilevered main square steel respectively, and initially position them at 100mm and 1000mm away from the far end of the outer wall; then, at 100mm away from the far end of the outer wall of the cantilevered main square steel, use the screw of the square steel limiting bolt to pass through the first horizontal central axis through hole of the cantilevered main square steel and the limiting hole of the sliding connector at the same time, and lock it with the square steel limiting bolt nut to realize the position locking of a single sliding connector on the square steel tube; S5: Fit the disc buckle upright onto the cylinder of the sliding connector; then, adjust the position of the round hole in the tube wall of the disc buckle upright so that it is aligned with the through hole on the cylinder of the sliding connector; next, use a pin to lock the disc buckle upright to the sliding connector by passing through the round hole of the disc buckle upright and the through hole on the cylinder; finally, after all the disc buckle uprights are erected, erect a disc buckle scaffold no more than 4m high on the cantilevered main square steel. S6: Assemble and install the tie rods on the floor. First, assemble according to the required tie rod length on site: when the required length is 2800mm to 3600mm, select two tie rod heads and screw them into the central cylinder of the round tube from both ends to assemble a standard tie rod; when the required length exceeds 3600mm, the central cylinder of the round tube must first be screwed to one or more extended round tube sections to form an extended assembly, and then two tie rod heads are selected and screwed into the assembly from both ends. First, assemble the upper tension struts into an extra-long strut. Then, install the upper tension struts: place the lower end pull rings of the two upper tension struts on the outside of the two upper pull rings of the sliding connector. Use two ultra-short bolts to insert from the inside to the outside, passing them sequentially through the round holes of the upper pull rings of the sliding connector and the round holes of the pull rings on the tension strut heads, and tighten with nuts to achieve a hinged lower end. Next, fine-tune the upper tension strut heads so that their pull ring holes align with the already fixed... The lower end of a "7"-shaped groove on the upper fixed plate of the concrete exterior wall is brought close together. A rod limiting bolt is then passed through the ring holes of the pull rings on the heads of the two upper tie rods. The two ends of the rod limiting bolt are supported on the corresponding "7"-shaped grooves on the first flange of the upper fixed plate. Finally, the tie rod is tightened by rotating the central tube of the cylindrical tube to put it under tension, thereby reliably transferring the load of the cantilevered main square steel to the upper fixed plate. The installation method of the lower tie rod is similar to that of the upper tie rod. It is hinged to the pull ring on the lower side of the sliding connector using two ultra-short bolts inserted from the inside to the outside. The other end is supported by a rod limiting bolt on the end of a 45° downward-sloping straight groove on the lower fixed plate to form a stable lower support. Finally, the length of the entire tie rod is adjusted through the radial through hole of the central tube of the tie rod so that the cantilevered main square steel connected to the tie rod can achieve the effect of pressure transmission with the upper fixed plate. S7: The length of the cantilevered main square steel at the external corner of the building is relatively long and it is subject to a large bending moment. Therefore, two bracing rods need to be installed on the lower pull ring of the sliding connector to provide upward support. The connection method here needs to be adjusted: the single rod limiting bolt used to connect the upper fixed plate is replaced with two ultra-short bolts, which are used to connect the two bracing rods below, so that the four bracing rods can provide upward and downward support and limit the single external corner cantilevered main square steel in four directions. S8: When constructing a suspended concrete corridor in a building, a platform is erected to support the cantilevered square steel system. First, the exterior walls on both sides of the lower floor concrete exterior wall before the formwork is closed are positioned. Embedded sleeves are then installed at fixed points on both sides of the exterior walls to create conditions for the later installation of the upper and lower fixing plates and the cantilevered main square steel. Next, after the concrete of the exterior wall has reached its strength after demolding, double-ended bolts and nuts are used to install the cantilevered main square steel, upper fixing plate, and lower fixing plate. Then, according to the design requirements, the upper and lower tie rods are installed, and the sliding connectors are effectively connected to the upper and lower fixing plates to form a bottom-supported, top-pull structure. Finally, at the end of the square steel tube of the cantilevered main square steel… The head is inserted into the central shaft of the square tube and two square steel limiting bolts are used to tighten and limit the cantilevered main square steel and the central shaft of the square tube. Then, an extended square rod section is used to connect the other end of the central shaft of the square tube and two square steel limiting bolts are used to tighten and extend the component until the horizontal length of the suspended concrete corridor to be erected is connected by continuous main square steel components. Finally, the spacing of the disc-lock scaffold uprights of the disc-lock scaffold is positioned according to the design requirements of several sliding connectors, and the sliding connectors that can be limited by square steel limiting bolts are limited. The disc-lock uprights are connected at the central shaft of each sliding connection according to the design requirements and locked with pins before the entire disc-lock scaffold is erected. S9: After the disc-lock scaffolding is erected, it is necessary to check whether the entire supporting square steel system, consisting of cantilevered main square steel, square tube central cylinder, and extended square rod sections, will deflect. The testing method is as follows: Insert a laser pointer into the laser pointer sleeve of the sliding connector closest to one side of the concrete exterior wall. The laser pointer should be horizontal and able to emit a horizontal laser beam. Next, adjust the direction of the laser pointer's beam so that it is parallel to one edge of the square steel tube of the cantilevered main square steel. Then, follow the direction of the laser pointer's beam to see if the beam can pass smoothly through the cylinder of the laser pointer sleeve of the second sliding connector. Check the third, fourth, and so on sliding connectors in this way. If the beam cannot pass through the cylinder, it is necessary to check whether the height of the square tube has deflected. By fine-tuning the length of the adjacent bracing rod, the cylinder can be smoothly passed through by the laser beam. This operation method can ensure the levelness of the entire supporting square steel system. S10: When it is necessary to erect a protective canopy for construction vehicles to pass parallel to the building side, on the basis of erecting a cantilevered disc-lock scaffold, the main body of the protective canopy roof is formed by extending the square tube central axis cylinder and the extended square bar sections to a suitable length; then, two strip-type disc-lock scaffolds are erected, and the height is such that the top disc-lock uprights are connected to the lower part of the central axis cylinder of the extended square steel through the pre-reserved sliding connectors, and locked with pins; finally, protective panels are installed as the roof on the extended square steel composed of the extended square bar sections of the extended square tube central axis cylinder to achieve roof protection; S11: When it is necessary to erect a pedestrian safety passage protective canopy perpendicular to the building edge, extend the canopy's main square steel structure, which consists of a cantilevered main square steel, a square tube central axis, and extended square pole sections, within the area where the safety passage is to be erected. Next, erect two strip-shaped disc-lock scaffolds perpendicular to the building to serve as the left and right boundaries of the passage. The erection height should be such that the top uprights are connected to the lower axis of the pre-reserved sliding connector on the extended square steel and locked with pins. Finally, use protective panels as the canopy, installed on the extended square steel structure consisting of the extended square tube central axis and extended square pole sections, to achieve canopy protection.

[0019] Based on the above, the beneficial effects of the disc-lock scaffolding special quick-assembly cantilever square steel system and its construction method of the present invention are as follows: First, the system integrates active safety monitoring and early warning functions. An infrared level monitoring device ensures the horizontality of the cantilevered square steel after installation, effectively preventing uneven stress caused by installation deviations. Simultaneously, a mechanically flip-up warning sign automatically erects when the upper fixed plate is pulled or shifted, providing an intuitive safety warning and greatly enhancing the safety controllability and accident prevention capabilities of the entire support system.

[0020] Secondly, the structure boasts extremely high safety. The upper tie rod and lower support rod can flexibly form a stable triangular force-bearing system through sliders, reliably transferring the frame load to the main building structure; all connection nodes are mechanically locked with bolts, ensuring firmness and reliability, overcoming the risk of slack that exists in traditional wire rope unloading, and guaranteeing the stability and safety of the load-bearing capacity from the design principle.

[0021] Third, the system is easy and efficient to install and dismantle, and achieves standardized reuse. All components are factory-prefabricated standard parts, lightweight, with uniform connection methods, eliminating the need for large hoisting equipment during on-site assembly, significantly reducing labor intensity and reliance on machinery. All components can be disassembled and reused without damage, avoiding the waste of traditional I-beam pre-embedded parts, meeting green construction requirements, and demonstrating outstanding economic efficiency.

[0022] Finally, this invention possesses excellent functional scalability and multi-functional adaptability. Its modular and sliding design allows it not only to be used for conventional external scaffolding support, but also to be quickly erected as a suspended formwork platform for construction safety passages, heavy vehicle access roads, and large-span reinforced concrete corridors. This powerful scalability meets the diverse operational needs of projects, enabling a single system to serve multiple purposes and significantly improving equipment utilization and the flexibility of construction organization. Attached Figure Description

[0023] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0024] Figure 1This is a full view of the disc-lock scaffolding-specific quick-assembly cantilever square steel system of the present invention; Figure 2 This is an exploded view of the disc-lock scaffolding quick-assembly cantilever square steel system of the present invention; Figure 3 This is a full view of the cantilevered main square steel of the present invention; Figure 4 Here is a full view of the sliding connector of the present invention: Figure 5 This is a full view of the square tube central shaft of the present invention; Figure 6 This is a full view of the extended square rod segment of the present invention; Figure 7 This is a full view of the double-ended screw of the present invention; Figure 8 This is a full view of the pre-embedded sleeve of the present invention; Figure 9 This is a full view of the upper fixing plate of the present invention; Figure 10 This is an enlarged view of the top of the upper fixing plate of the present invention; Figure 11 This is an enlarged view of the bottom of the upper fixing plate of the present invention; Figure 12 This is a full view of the lower fixing plate of the present invention; Figure 13 This is a full view of the square steel limiting bolt of the present invention; Figure 14 This is a full view of the rod limiting bolt of the present invention; Figure 15 This is a full view of the ultra-short bolt of the present invention; Figure 16 This is a full view of the strut head of the present invention; Figure 17 This is a full view of the cylindrical shaft of the circular tube of the present invention; Figure 18 This is a full view of the extended circular pipe section of the present invention; Figure 19 This is a schematic diagram of step one of the steps in constructing the cantilevered disc-lock scaffolding of the present invention; Figure 20 This is a schematic diagram of step two of the construction of the cantilevered disc-lock scaffolding according to the present invention; Figure 21 Schematic diagram A shows step three of the construction of the cantilevered disc-lock scaffolding according to the present invention; Figure 22 This is a schematic diagram (B) illustrating step three of the construction of the cantilevered disc-lock scaffolding according to the present invention; Figure 23 This is a schematic diagram of step four of the construction of the cantilevered disc-lock scaffolding according to the present invention; Figure 24This is a schematic diagram of step five of the process of erecting the cantilevered disc-lock scaffolding according to the present invention; Figure 25 This is one of the schematic diagrams for step six of erecting the cantilevered disc-lock scaffolding of the present invention; Figure 26 This is the second schematic diagram of step six of the present invention for erecting a cantilevered disc-lock scaffold; Figure 27 This is one of the schematic diagrams for step seven of the present invention for erecting a cantilevered disc-lock scaffold; Figure 28 This is the second schematic diagram of step seven of the present invention for erecting a cantilevered disc-lock scaffold; Figure 29 This is a schematic diagram of step one of the steps in constructing the connecting corridor steel platform according to the present invention; Figure 30 This is a partially enlarged view of a schematic diagram of step one of the construction of the connecting corridor steel platform according to the present invention; Figure 31 This is a schematic diagram of step two of the present invention: erecting the steel platform for the connecting corridor. Figure 32 This is one of the schematic diagrams for step three of constructing the connecting corridor steel platform according to the present invention; Figure 33 This is the second schematic diagram of step three of the present invention: erecting the steel platform for the connecting corridor. Figure 34 This is a schematic diagram illustrating the construction of an access road for engineering vehicles according to the present invention; Figure 35 This is a schematic diagram illustrating the construction of a personnel safety passage according to the present invention; Figure 36 This is a schematic diagram illustrating the storage process of the disc-lock scaffolding-specific quick-assembly cantilever square steel system of the present invention; Figure 37 This is a schematic diagram showing the completed storage of the disc-lock scaffolding-specific quick-assembly cantilever square steel system of the present invention.

[0025] In the picture: 1-Cantilevered main square steel; 101-Square steel tube; 1011-First horizontal central axis through hole; 102-Anchor plate; 1021-Round hole; 103-Three-section circular connecting section; 104-Supporting triangular iron; 2-Sliding connector; 201-Main frame; 202-Pull ring; 2021-Round hole; 203-Shaft cylinder; 2031-Through hole; 204-Limiting hole; 205-Laser pen sleeve; 2051-Cylinder; 3-Square tube central shaft cylinder; 301-Main square tube; 3011-Second horizontal central shaft through hole; 302-Rectangular sleeve; 4-Extended square rod segment; 401-Third horizontal central shaft through hole; 5-Embedded sleeve; 501-Support ring; 502-Cylinder body; 503-Double hook ring; 504-Friction ring; 6-Double-ended screw; 601-Smooth section; 7-Upper fixing plate; 701-First base plate; 7011-First oblong hole; 7012-Semicircular hole; 702-First flange; 7021-“7” shaped groove; 7022-First reinforcing rib; 703-First rectangular steel plate; 7031-Double ear hole; 704-Warning plate; 7041-Counterweight; 7042-Perforated shaft; 7043-Pin pin; 705-First two-section annular connecting section; 8-Lower fixing plate; 801-Second base plate; 8011-Second oblong hole; 802-Second flange; 8021-Slotted groove; 8022-Second reinforcing rib; 803-Second rectangular steel plate; 804-Second two-section annular connecting section; 9-Square steel limit bolt; 901-Square steel limit bolt nut; 10 - Rod limiting bolt; 11-Ultra-short bolts; 12-Stretcher head; 1201-Earring puller cover; 12011-Pull ring; 12012-Pull ring hole; 1202-Round steel tube; 13-Central shaft of round tube; 1301-Radial through hole; 14-Extended circular pipe section; 1401-Solid circular bar section; 1402-Hollow circular pipe section 15 - Concrete exterior wall; 16-Dial buckle upright; 17-Pin; 18-Laser pointer; 19-Template; 20-Stretch bar; 21-Shear wall reinforcement; 22-Concrete; 23-Cantilevered main square steel at the external corner; 2301-Anchor plate at the external corner; 24-Fixing plate on the outer corner; 2401-First outer corner base plate; 24011-Third elongated hole. Detailed Implementation

[0026] Below, in conjunction with Figures 1 to 37 This invention provides a detailed description of the disc-lock scaffolding-specific quick-assembly cantilever square steel system and its construction method.

[0027] like Figure 1-37 As shown, the disc-lock scaffolding special quick-assembly cantilever square steel system of the present invention includes a cantilever main square steel 1, a sliding connector 2, a square tube central shaft cylinder 3, an extended square rod section 4, a pre-embedded sleeve 5, a double-headed screw 6, an upper fixing plate 7, a lower fixing plate 8, a square steel limiting bolt 9, a rod limiting bolt 10, an ultra-short bolt 11, a bracing rod head 12, a round tube central shaft cylinder 13, and an extended round tube section 14.

[0028] like Figure 1 , Figure 2 As shown, the pre-embedded sleeve 5 is pre-embedded in the concrete exterior wall 15, and one end of the double-ended screw 6 is screwed into the pre-embedded sleeve 5. A circular hole is provided at the end of the cantilevered main square steel 1 near the concrete exterior wall 15. This circular hole is inserted into the other end of the double-ended screw 6 and secured with a nut, thereby reliably fixing the cantilevered main square steel 1 to the concrete exterior wall 15 and allowing it to cantilever outwards. The sliding connector 2 has a sleeve structure adapted to the outer contour of the cantilevered main square steel 1, allowing it to slidably fit onto the cantilevered main square steel 1 and move axially to adjust its installation position.

[0029] To further extend the cantilever span, the present invention also includes a square tube central shaft 3 and an extended square rod section 4. The square tube central shaft 3 comprises a three-section structure, with the cross-sectional dimensions of its two end sections suitable for insertion into the inner cavity of the cantilever main square steel 1, and the cross-sectional dimensions of its middle section being consistent with those of the cantilever main square steel 1 to achieve axial limiting. The cross-section of the extended square rod section 4 is consistent with that of the cantilever main square steel 1, and it can be inserted into the far end of the square tube central shaft 3, together forming an extension structure of the cantilever load-bearing body; this extension structure is locked through by square steel limiting bolts 9 to ensure connection strength and overall stability. The upper fixing plate 7 and the lower fixing plate 8 are respectively anchored to the corresponding elevation positions of the concrete outer wall 15 by three sets of double-headed bolts 6 and nuts, forming the anchoring base points for the upper tie and the lower support. The strut head 12, the cylindrical tube 13, and the extended cylindrical tube section 14 can be assembled into a strut 20 with adjustable length. One end of the strut 20 is connected to the pull ring on the sliding connector 2 via an ultra-short bolt 11, and the other end is connected to and locked to the slot on the upper fixed plate 7 or the lower fixed plate 8 via a rod limiting bolt 10, thereby forming a stable triangular support system.

[0030] like Figure 3As shown, the cantilevered main square steel 1 is composed of a square steel tube 101, an anchor plate 102, a three-section annular connecting section 103, and a supporting triangular iron 104. The square steel tube 101 has a cross-sectional dimension of 150mm×150mm×10mm and a length of 1300mm. A rectangular anchor plate 102 with dimensions of 180mm×300mm×15mm is vertically welded to its tail end. The weld seam is continuously and fully welded along the outer circumference of the tail end of the square steel tube 101 to ensure connection strength and reliable load transfer. The upper and lower edges of the anchor plate 102 are respectively provided with three-section annular connecting sections 103, which are used to cooperate with the first two-section annular connecting section 705 at the end of the upper fixed plate 7 or the second two-section annular connecting section 804 at the end of the lower fixed plate 8. When the first two-section annular connecting segment 705 at the end of the upper fixing plate 7 or the second two-section annular connecting segment 804 at the end of the lower fixing plate 8 is joined with the three-section annular connecting segment 103, they are aligned in an interlocking manner. Wires or pins 17 are threaded through five corresponding annular holes, thus reliably connecting the anchor plate 102 to the upper fixing plate 7 and the lower fixing plate 8 into a single unit. Near the anchor plate 102 at the tail end of the square steel pipe 101, a supporting triangular iron 104 is also provided. The supporting triangular iron 104 is an equilateral right-angled member with dimensions of 70mm × 70mm × 15mm. One right-angled side of the supporting triangular iron 104 is welded to the tail end of the square steel pipe 101, and its other right-angled side is welded to the lower part of the long side central axis of the anchor plate 102, together forming a reinforcing node that effectively improves the stiffness and shear bearing capacity of the anchoring zone. In addition, two 20mm diameter circular holes 1021 are made on the anchor plate 102 at 50mm above the square steel tube 101. These two holes 1021 are located at the second and fifth divisions of the short side of the anchor plate 102, and are used to insert the double-ended screw 6 for additional connection or installation positioning. On the central axis of the side of the square steel tube 101, first horizontal central axis through holes 1011 are made at 100mm, 200mm and 500mm from the end, respectively. The diameter of each hole is 16mm, and they are used to install the square steel limiting bolt 9.

[0031] like Figure 4As shown, the sliding connector 2 is a steel assembly component, mainly composed of a main square frame 201, a pull ring 202, a shaft cylinder 203, a limiting hole 204, and a laser pointer sleeve 205. The main square frame 201 is a square frame structure, and its inner contour matches the outer diameter of the square steel tube 101 of the aforementioned cantilevered main square steel 1. The material thickness is 10mm and the width is 100mm, and it can slide axially along the square steel tube 101 of the cantilevered main square steel 1. Two pull rings 202 are vertically welded to the upper and lower surfaces of the main frame 201, respectively. The pull ring 202 is ear-shaped and consists of a semi-circular part with a diameter of 100mm and a rectangular part of 100mm×80mm. The thickness of the plate is 15mm. The pull ring 202 is welded to the thickness edge of the main frame 201 with its 100mm long rectangular side, and the outer side of the pull ring 202 is flush with the outer side of the main frame 201. A circular hole 2021 with a diameter of 20mm is opened at the center of each pull ring 202 for connecting the bracing rod head 12. At the geometric center of the upper and lower surfaces of the main frame 201, shaft cylinders 203 are vertically welded. The shaft cylinders 203 are round steel pipes, 50mm long, 40mm in outer diameter, and 3mm thick. The axes of the upper and lower shaft cylinders 203 coincide. A through hole 2031 with a diameter of 10mm is formed in the shaft cylinder 203 for inserting the disc-lock uprights 16 of the disc-lock scaffold and locking them with pins 17. At the geometric center of each side of the main frame 201, a through-hole 204 with a diameter of 16mm is formed for the square steel limiting bolts 9 to pass through and fix their position to the cantilevered main square steel 1. A laser pointer sleeve 205 is provided on the upper outer side of one side of the main frame 201. The cross-section of the sleeve is a square with a diameter of 30mm×30mm. A cylinder 2051 with a diameter of 20mm is opened in the center. The upper surface of the laser pointer sleeve 205 is flush with the upper surface of the main frame 201, and its thickness is the same as that of the main frame 201. It is used to house the laser pointer 18 to monitor the installation level and system deformation in real time.

[0032] like Figure 5As shown, the square tube central shaft cylinder 3 consists of a main square tube 301 and a rectangular sleeve 302. The main square tube 301 is a square steel tube structure, and its outer diameter matches the inner diameter of the cantilevered main square steel 1. Its wall thickness is 10mm and its total length is 860mm. It can be inserted into the end of the cantilevered main square steel 1 to achieve axial extension. On the main square tube 301, a second horizontal central shaft through hole 3011 is opened at a distance of 100mm and 200mm from both ends of the rectangular sleeve 302, respectively. The hole diameter is 16mm, which is used to pass through the square steel limiting bolt 9 and fix it to the cantilevered main square steel 1. The rectangular sleeve 302 is fixedly installed in the middle of the main square tube 301. Its cross-sectional dimensions are consistent with the cross-section of the cantilever main square steel 1. Its width is 60mm. It is used to provide centering limit and enhance bending stiffness at the connection. After assembly, the main square tube 301 extends 300mm from both sides of the rectangular sleeve 302 to form a reliable insert-type connection section, which together constitutes a detachable cantilever structure extension component.

[0033] like Figure 6 As shown, the extended square rod segment 4 is a rectangular square tube structure with the same cross-sectional dimensions as the cantilevered main square steel 1 and a total length of 1400mm. It is used to connect with the central shaft cylinder 3 of the square tube to extend the cantilever span. On the extended square rod segment 4, at 100mm and 200mm from both ends and at the center of the square tube, respectively, a third horizontal central shaft through hole 401 with a diameter of 16mm is provided. This hole is used for the square steel limiting bolt 9 to pass through, so as to reliably fix and axially position the extended square rod segment 4 with the adjacent connecting parts.

[0034] like Figure 8 As shown, the embedded sleeve 5 is a steel cylindrical component, comprising a support ring 501, a cylinder 502, a double hook ring 503, and a friction ring 504. The support ring 501 is a metal ring with an outer diameter of 20mm, a central hole diameter of 10.5mm, and a thickness of 6mm. The cylinder 502 is welded to the rear axis of the support ring 501. The cylinder 502 is a cylindrical structure with a diameter of 12mm, a wall thickness of 2mm, and a length of 100mm. Its inner surface is threaded throughout for screwing into the M20 double-ended screw 6. A closed end cap is provided at the end of the cylinder 502 away from the support ring 501. A double hook ring 503 is fitted around the outer circumference of the cylinder 502 10mm from the closed end. The double hook ring 503 includes an annular body and a pair of metal hooks symmetrically welded to its outer side, forming an arc-shaped structure for hooking around the surrounding reinforcing bars for additional fixation. In addition, multiple friction rings 504 are welded at intervals on the outer surface of the cylinder 502. The inner diameter of the friction rings 504 is 12mm and the outer diameter is 15mm. The friction rings 504 are evenly distributed at 23mm intervals along the axial direction of the cylinder 502 to enhance the bond strength and pull-out resistance with the concrete.

[0035] like Figure 7As shown, the double-ended screw 6 is an M20 threaded rod, and its thread specification matches the machined thread inside the cylinder 502 of the pre-embedded sleeve 5. The total length of the double-ended screw 6 is 225mm, and its two ends are threaded sections of 100mm each, used to screw into the pre-embedded sleeve 5 and tighten the external fixing nut respectively. The double-ended screw 6 has an unmachined smooth rod section 601 in the middle, which has a diameter of 20.5mm and a length corresponding to the superimposed thickness of the template 19 and the support ring 501, used to provide a stable support surface and ensure accurate axial positioning during installation.

[0036] like Figure 9 , Figure 10 , Figure 11 As shown, the upper fixing plate 7 has a body of a homogeneous channel steel component with a length of 1400mm. Its first base plate 701 has a width of 210mm, and the first flanges 702 located on both sides of the first base plate 701 have a width of 80mm and a wall thickness of 12mm. On the central axis of the first base plate 701, three sets of elliptical first elongated holes 7011 are opened at 200mm from each end and at the center. The diameter of the first elongated hole 7011 is 21mm, and the length of its straight section is 15mm. The upper end of the upper fixing plate 7 is closed by a first rectangular steel plate 703 of the same thickness. A pair of double-ear holes 7031 are welded to the outside of the slot and onto the first rectangular steel plate 703. The distance between the two double-ear holes 7031 is 25mm, and they extend outwards at a 45° angle away from the first base plate 701. A semi-circular hole 7012 with a depth of 30mm and a radius of 8mm is opened in the middle of the longitudinal central axis of the first base plate 701 at the bottom end of the first rectangular steel plate 703. A “7”-shaped slot 7021 is coaxially opened on the two first flanges 702 at distances of 200mm, 700mm and 1200mm from the upper end, respectively. The straight section of the “7”-shaped slot 7021 is 60mm long, the vertical section sloping outward is 50mm long, the inclination angle is 70°, and the width of the “7”-shaped slot 7021 is 25mm, which is used to hang the rod limiting bolt 10. Each group of “7”-shaped slots 7021 has an inverted L-shaped first reinforcing rib 7022 welded to its bottom. The first reinforcing rib 7022 is 40mm high and is arranged across the full width of the first base plate 701. Its horizontal section is pressed against the first flanges 702 on both sides, and its vertical section covers the bottom of the slot of the upper fixing plate 7, which significantly enhances the structural strength of the “7”-shaped slot 7021 area.

[0037] The bottom end of the upper fixing plate 7 is provided with a first two-section circular connecting section 705, which is used to interlock with the three-section circular connecting section 103 at the end of the anchor plate 102 of the cantilever main square steel 1; when the two are connected, they are aligned in an interlocking manner, and the pins 17 are inserted through five corresponding circular holes to achieve a reliable connection between the anchor plate 102 and the upper fixing plate 7.

[0038] The present invention also includes a warning plate 704, which is a red rectangular plate with a width that matches the middle gap of the double ear holes 7031, a length of 120mm, and a cylindrical counterweight 7041 with a diameter of 18mm at its tail end. The warning plate 704 is hinged between two double-eared holes 7031 via a perforated shaft 7042, and can rotate 90° around the perforated shaft 7042. Its head end is flush with the first base plate 701 of the upper fixing plate 7, and a 25mm long and 3mm diameter pin 7043 is provided in the middle of this end. When the upper fixing plate 7 is installed close to the concrete outer wall 15, the pin 7043 at the head end of the warning plate 704 is inserted into the semi-circular hole 7012 of the first base plate 701, and under the friction constraint of the outer wall surface, it overcomes the torque of the counterweight 7041, keeping the warning plate 704 in a horizontal storage state. If a loose gap appears between the upper fixing plate 7 and the concrete outer wall 15, the pin 7043 will disengage from the semi-circular hole 7012 and the wall surface, losing friction constraint. At this time, the counterweight 7041 drives the warning plate 704 to rotate around the perforated shaft 7042 to a vertical state, forming a conspicuous visual warning.

[0039] like Figure 12 As shown, the body of the lower fixing plate 8 is made of homogeneous channel steel with a length of 1400mm. Its second base plate 801 has a width of 210mm, and the width of the second flanges 802 on both sides is 80mm. The overall wall thickness is 12mm. On the central axis of the second base plate 801, three sets of elliptical second oblong holes 8011 are provided at 200mm from both ends and at the center. The diameter of the second oblong hole 8011 is 21mm, and the length of its straight section is 15mm. The lower end of the lower fixing plate 8 is closed by a second rectangular steel plate 803 of the same thickness. On the two second flanges 802, at distances of 400mm, 900mm, and 1400mm from the upper end, respectively, coaxially open a downward-sloping, 45° angled slot 8021. The straight section of the slot 8021 is 70mm long and is used to support the rod limiting bolt 10 and transmit the downward-sloping support force. Each set of I-shaped slots 8021 is welded with an inverted L-shaped second reinforcing rib 8022. The height of the second reinforcing rib 8022 is 40mm. Its upper end is located below the starting end of the I-shaped slot 8021. Its horizontal section is pressed against the two second flanges 802. Its upper part extends to the tail end of the I-shaped slot 8021, thereby significantly enhancing the resistance to local buckling and shear in this area.

[0040] The top surface of the lower fixing plate 8 is provided with a second two-section annular connecting section 804, which is used to interlock with the three-section annular connecting section 103 at the end of the anchor plate 102 of the cantilever main square steel 1. When the two are connected, they form an interlocking alignment relationship, and the anchor plate 102 and the lower fixing plate 8 are reliably mechanically connected by inserting pins 17 through five corresponding annular holes.

[0041] like Figure 13As shown, the square steel limiting bolt 9 is an M16 through bolt, whose nominal diameter matches the 16mm diameter of the first horizontal central axis through hole 1011 opened on the side of the cantilevered main square steel 1. The total length of the square steel limiting bolt 9 is 200mm. The square steel limiting bolt 9 is used to pass through the second horizontal central axis through hole 3011 of the cantilevered main square steel 1 and the square tube central axis cylinder 3 connected thereto, or the corresponding third horizontal central axis through hole 401 on the extended square rod section 4, and is tightened by the square steel limiting bolt nut 901, thereby achieving reliable limiting and fixing of each extended component on the cantilevered main square steel 1, ensuring the rigidity and force transmission reliability of the overall cantilever structure.

[0042] like Figure 14 As shown, the rod limiting bolt 10 is an M20 standard bolt with a bolt length of 200mm.

[0043] like Figure 15 As shown, the ultra-short bolt 11 is an M20 standard bolt with a bolt length of 70mm. It is used to pass through the pull ring hole 12012 on the lug pull head cover 1201 of the strut head 12 and the corresponding pull ring 2021 on the upper and lower surfaces of the sliding connector 2. It is then tightened with a nut to achieve a reliable hinge between the strut head 12 and the sliding connector 2. This connection method can effectively transmit the load on the strut 20 to adapt to the actual stress conditions during construction.

[0044] like Figure 16 As shown, the strut head 12 consists of an earring pull head cover 1201 and a round steel tube 1202. The round steel tube 1202 is made of steel with a diameter of 48mm and a wall thickness of 3mm, and its length is 1400mm ± 50mm. One end of the round steel tube 1202 is machined with outward thread rolling, with a thread protrusion of 1mm and a threaded section length of 150mm, which is used to adjust the overall length of the strut 20 by rotation. The other end is sleeved with the earring pull head cover 1201, and the joint is fully welded around the perimeter to ensure connection strength. The earring pull head cover 1201 is a round metal cover with a pull ring 12011 welded to the upper end, with a diameter of 51mm and a wall thickness of 3mm. The pull ring 12011 consists of a straight line segment and a semicircular arc. The length of the straight line segment is 50mm and the diameter of the semicircular arc is 50mm. A pull ring hole 12012 with a diameter of 20mm is opened in the center of the pull ring 12011. The overall thickness of the pull ring 12011 is 20mm, which is used for the rod limiting bolt 10 or the ultra-short bolt 11 to pass through, so as to achieve hinge connection with the sliding connector 2 or the slots 7021 and 8021 of the upper and lower fixing plates.

[0045] like Figure 17As shown, the cylindrical tube 13 is a cylindrical component with a diameter of 52mm, a wall thickness of 4mm, and a length of 1200mm. Its inner bore is machined with internal threads along its entire length, the size of which matches the size of the external convex thread of the cylindrical steel tube 1202 of the bracing rod head 12. The two bracing rod heads 12 can be screwed into the cylindrical tube 13 from both ends, and the extension length can be adjusted by rotation, achieving stepless length adjustment of the entire bracing rod 20 within the range of 2800mm to 3600mm. A radial through hole 1301 with a diameter of 16mm is opened on the side wall of the middle section of the cylindrical tube 13 for inserting an iron rod or special tool to assist rotation, facilitating force application and positioning during adjustment.

[0046] like Figure 18 As shown, the extended circular tube segment 14 is a composite tubular component, comprising a solid circular bar segment 1401 and a hollow circular tube segment 1402. The solid circular bar segment 1401 is 300 mm long, and the hollow circular tube segment 1402 is 900 mm long. The end face of the solid circular bar segment 1401 is coaxially aligned and fixedly connected to the beginning end face of the hollow circular tube segment 1402, ensuring that the axis of the solid circular bar segment 1401 coincides with the axis of the hollow circular tube segment 1402, together forming a continuous extended shaft. The hollow circular tube segment 1402 is a component with a diameter of 52 mm and a wall thickness of 4 mm. Its inner bore is machined with internal threads along its entire length, the dimensions of which match the dimensions of the external convex thread rolling of the circular steel tube 1202 of the bracing rod head 12. The solid circular bar segment 1401 is a solid circular bar, and its cross-sectional outer diameter is consistent with the outer diameter of the circular steel tube 1202 of the bracing rod head 12. The solid round bar segment 1401 is machined with convex thread rolling along its entire length, and can be screwed into the central cylinder 13 of the round tube.

[0047] like Figure 19 As shown, when it is necessary to erect a cantilevered disc-lock scaffold at the shear wall of a three-story building: Step 1: After the reinforcement 21 of the third-story wall is tied, and the formwork 19 for closing the shear wall is prepared, positioning holes are drilled on the formwork 19 for the later installation of the cantilevered main square steel 1, upper fixing plate 7, and lower fixing plate 8. The diameter of the holes is 22mm ± 2mm. Then, a double-ended screw 6 is passed through the drilled hole in the formwork 19 and screwed into the embedded sleeve 5. Next, the matching nut is screwed into the other end of the double-ended screw 6 and locked. By tightening the nut, the support ring 501 of the embedded sleeve 5 and the nut of the double-ended screw 6 are tightly fitted to the inner and outer surfaces of the formwork 19, thereby achieving precise positioning and fixation of the embedded sleeve 5. The double hook ring 503 of the embedded sleeve 5 is designed to hook onto the longitudinal and transverse reinforcement 21 in the wall to enhance its pull-out resistance. Finally, pour the concrete 22 for the shear wall. After the concrete 22 has reached the required strength, loosen and remove the nuts at both ends of the double-ended screw 6. Then, the double-ended screw 6 can be unscrewed from the embedded sleeve 5 and the formwork 19, thereby removing the formwork 19.

[0048] like Figure 20 As shown, in step two: After removing the template 19, install the double-ended threaded rods 6 of the cantilevered main square steel 1 in groups of two. Install the double-ended threaded rods 6 of the upper fixing plate 7 in groups of three, with equal spacing, exposed on the outer wall. Then, pass the round holes 1021 on the anchor plate 102 of the cantilevered main square steel 1 through the double-ended threaded rods 6. Finally, install the nuts that match each double-ended threaded rod 6 and screw them in to firmly attach the anchor plate 102 to the outer wall surface, thus completing the installation of the entire cantilevered main square steel 1 of the scaffold. The installation method of the upper fixing plate 7 is the same.

[0049] like Figure 21 , Figure 22 As shown, step three: For the installation of the cantilevered main square steel 1, upper fixing plate 7, and lower fixing plate 8 at the corner of the building, it is necessary to process them into external corner cantilevered main square steel 23, external corner upper fixing plate 24, and external corner lower fixing plate. Compared with the cantilevered main square steel 1, the external corner cantilevered main square steel 23 has its external corner anchor plate 2301 processed into an external corner shape to fit against the external corner wall surface, while the rest remains the same. The first external corner base plate 2401 of the external corner upper fixing plate 24 and the second external corner base plate of the external corner lower fixing plate are processed into 90° bent right angles to fit against the external corner wall surface. The third elongated hole 24011 of the external corner upper fixing plate 24 and the fourth elongated hole of the external corner lower fixing plate are added to each external corner upper fixing plate 24 and external corner lower fixing plate, that is, the external corner upper fixing plate 24 and external corner lower fixing plate have two elongated holes reserved on each external corner wall surface, and their height positions are staggered.

[0050] like Figure 23 As shown, step four: two sliding connectors 2 are fitted onto the square steel tube 101 of each cantilevered main square steel 1; the two sliding connectors 2 are slid onto the square steel tube 101 of the cantilevered main square steel 1 respectively, and initially positioned at a distance of about 100mm and 1000mm from the far outer wall end (i.e., the end where the anchor plate 102 is installed); then, at a distance of 100mm from the far outer wall end of the cantilevered main square steel 1 (i.e., the end where the anchor plate 102 is installed), the screw of the square steel limiting bolt 9 is simultaneously passed through the first horizontal central axis through hole 1011 of the cantilevered main square steel 1 and the limiting hole 204 of the sliding connector 2, and locked with the square steel limiting bolt nut 901, thereby locking the position of a single sliding connector 2 on the square steel tube 101.

[0051] like Figure 24 As shown, step five: First, attach the disc-lock upright 16 to the shaft sleeve 203 of the sliding connector 2. Next, adjust the orientation of the round hole in the tube wall of the disc-lock upright 16 so that it aligns with the through hole 2031 on the shaft sleeve 203 of the sliding connector 2. Then, use a pin 17 to pass through the round hole of the disc-lock upright 16 and the through hole 2031 on the shaft sleeve 203 to lock the disc-lock upright 16 to the sliding connector 2. Finally, after all the disc-lock uprights 16 are erected, a disc-lock scaffolding no more than 4m high can be erected on the cantilevered main square steel 1.

[0052] like Figure 25 , Figure 26 As shown, step six: Assemble and install the strut brace 20 on the floor. First, assemble according to the required strut length on site: when the required length is 2800mm to 3600mm, select two strut heads 12 and screw them into the central tube 13 from both ends to assemble a standard strut brace 20. When the required length exceeds 3600mm, first screw the central tube 13 to one or more extended tube sections 14 to form an extended assembly, and then similarly select two strut heads 12 and screw them into the assembly from both ends to assemble an extra-long strut brace 20.

[0053] Next, install the upper support rods 20: place the pull rings 12011 at the lower end of the two upper support rods 20 on the outside of the two upper pull rings 202 of the sliding connector 2, and use two ultra-short bolts 11 to pass from the inside (near the main frame 201) to the outside, passing through the round hole 2021 of the upper pull ring 202 of the sliding connector 2 and the pull ring round hole 12012 of the pull ring 12011 of the support rod head 12, and tighten with nuts to achieve the lower end hinge. Next, fine-tune the upper end of the upper bracing rod 20, so that its pull ring hole 12012 is close to the lower end of a "7" shaped slot 7021 of the upper fixing plate 7 that is fixed to the concrete exterior wall 15. Then, use a rod limiting bolt 10 to pass through the pull ring holes 12012 of the two upper bracing rod heads 12 at the same time, and support the two ends of the rod limiting bolt 10 on the corresponding "7" shaped slot 7021 of the first flange 702 of the upper fixing plate 7. Finally, tighten the bracing rod 20 by rotating the central shaft cylinder 13, so that it is under tension, thereby reliably transferring the load of the cantilevered main square steel 1 to the upper fixing plate 7.

[0054] The lower brace 20 is installed in a similar manner to the upper brace 20. It is hinged to the lower pull ring 202 of the sliding connector 2 using two ultra-short bolts 11 inserted from the inside out. The other end is supported by a rod limiting bolt 10 on the end of a 45° downward-sloping slot 8021 in the lower fixed plate 8, thus forming a stable lower support. Finally, the length of the entire brace 20 is adjusted through the radial through hole 1301 of the cylindrical shaft 13 of the brace 20 so that the cantilevered main square steel 1 connected to the brace 20 can achieve pressure transmission with the upper fixed plate 7.

[0055] like Figure 27 , 28As shown, in step seven: the length of the cantilevered main square steel 23 at the external corner of the building is longer than that of the cantilevered main square steel 1, and it is subject to a larger bending moment. Therefore, two bracing rods 20 need to be installed on the lower pull ring 202 of the sliding connector 2 to provide upward support. The connection method here needs to be adjusted: the single rod limiting bolt 10 used to connect the upper fixing plate 7 is replaced with two ultra-short bolts 11, which are used to connect the two lower bracing rods 20 respectively, so that the four bracing rods 20 can provide upward and downward support and limit the single external corner cantilevered main square steel 23 in four directions.

[0056] like Figure 29 , Figure 30 As shown, when constructing a suspended concrete corridor in a building, a platform can be erected to support the cantilevered square steel system. First, the exterior walls on both sides of the lower-level concrete exterior wall 15 before the closed formwork 19 are positioned. Pre-embedded sleeves 5 are then installed at fixed points on both sides of the exterior walls to create conditions for the later installation of the upper fixing plate 7, lower fixing plate 8, and cantilevered main square steel 1. Next, after the concrete 22 of the exterior wall 15 has reached its strength after demolding, double-ended bolts 6 with nuts are used to install the cantilevered main square steel 1, upper fixing plate 7, and lower fixing plate 8. Then, according to design requirements, the upper and lower tension rods 20 are installed, and the sliding connector 2 is effectively connected to the upper fixing plate 7 and lower fixing plate 8 to form a lower support and upper tension structure. Furthermore, the square steel tube 101 of the cantilevered main square steel 1 is inserted into the square tube central cylinder 3, and two square steel limiting bolts 9 are used to tighten and lock the cantilevered main square steel 1 and the square tube central cylinder 3. Next, the extended square rod segment 4 is connected to the other end of the square tube central cylinder 3, and two square steel limiting bolts 9 are used to tighten the connection to extend the component until the entire horizontal length of the suspended concrete corridor to be erected is connected by continuous main square steel components. Finally, several sliding connectors 2 are positioned according to the spacing dimensions of the disc-lock uprights 16 of the disc-lock scaffolding erected according to the design requirements, and the sliding connectors 2 that can be limited by square steel limiting bolts 9 are limited.

[0057] like Figure 31 As shown, the disc-lock uprights 16 are connected to the shaft cylinder 203 of each sliding connection 2 according to the design requirements and locked with pins 17 before the entire disc-lock scaffold is erected.

[0058] like Figure 32 , Figure 33As shown, after the disc-lock scaffolding is erected, it is necessary to check whether the entire supporting square steel system, consisting of the cantilevered main square steel 1, the square tube central cylinder 3, and the extended square rod section 4, will sag. The testing method is as follows: Insert a laser pointer 18 into the laser pointer sleeve 205 of the sliding connector 2 closest to one side of the concrete outer wall 15. The laser pointer 18 should be horizontal and able to emit a horizontal laser beam. Next, adjust the direction of the laser pointer 18 so that it is parallel to one edge of the square steel tube 101 of the cantilevered main square steel 1. Then, check whether the light can smoothly pass through the cylinder 2051 of the laser pointer sleeve 205 of the second sliding connector 2, following the direction of the laser pointer 18. Repeat this process for the third, fourth, and subsequent sliding connectors. If the light cannot pass through the cylinder 2051, it is necessary to check whether the height of the corresponding square tube has sagged. Fine-tuning the length of the adjacent bracing rod 20 can allow the laser beam to pass through the cylinder 2051 smoothly. This method ensures the levelness of the entire supporting square steel system.

[0059] like Figure 34 As shown, when it is necessary to erect a protective canopy for construction vehicles to pass parallel to the building, the main body of the protective canopy can be formed by extending the square steel, which consists of the extended square tube central shaft 3 and the extended square rod section 4, to a suitable length on the basis of erecting a cantilevered disc-lock scaffold. Next, two strip-type disc-lock scaffolds are erected, with the height reaching a certain level. The top disc-lock uprights are connected to the lower shaft 203 of the extended square steel through the pre-reserved sliding connector 2, and locked with pins 17. Finally, protective panels are installed as the canopy on the extended square steel, which consists of the extended square tube central shaft 3 and the extended square rod section 4, to achieve canopy protection.

[0060] like Figure 35 As shown, when it is necessary to erect a pedestrian safety passage shelter perpendicular to the building edge, the main square steel structure of the shelter, consisting of the cantilevered main square steel 1, the square tube central axis cylinder 3, and the extended square pole section 4, can be extended by extending the area of ​​the safety passage. Next, two strip-type disc-lock scaffolds are erected perpendicular to the building to serve as the left and right boundaries of the passage. The erection height is such that the top upright 16 is connected to the lower axis cylinder 203 of the pre-reserved sliding connector 2 on the extended square steel and locked with pins 17. Finally, protective panels are installed as the roof on the extended square steel structure consisting of the extended square tube central axis cylinder 3 and the extended square pole section 4 to achieve roof protection.

[0061] like Figure 36 , Figure 37As shown, after the completion and dismantling of this invention, its components can be efficiently recycled and reused multiple times, and its storage and transportation are also very convenient. Specifically, in the storage and transportation state, the cantilevered main square steel 1 can be connected side by side with the three-section annular connecting section 103 on the anchor plate 102 and the first two-section annular connecting section 705 at the end of the upper fixed plate 7 or the second two-section annular connecting section 804 at the end of the lower fixed plate 8. When the two are connected, their annular sections are aligned in an interlocking manner, and the pins 17 or other connecting parts are inserted through five corresponding annular holes, thereby reliably connecting the cantilevered main square steel 1 with the upper and lower fixed plates 7 and 8 into a whole. After connection, the upper fixed plate 7 and the lower fixed plate 8 can be rotated relative to each other with their annular connecting sections at their ends as the axis until the square steel tube 101 of the cantilevered main square steel 1 is covered inside, forming a regular cuboid-like combination unit. The multiple cuboid-like units formed in this way can be stacked tightly, which greatly facilitates loading and transportation. Similarly, the disassembled strut 20 can be adjusted to its shortest length by loosening it, and multiple struts 20 can be bundled side by side to form a neat bundle, thereby making full use of transportation space and achieving efficient and economical transshipment and warehousing.

[0062] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any transformations or substitutions that can be understood by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of the present invention.

Claims

1. A quick-assembly cantilever square steel system specifically for disc-lock scaffolding, characterized in that, Includes cantilevered main square steel (1), sliding connector (2), embedded sleeve (5), upper fixing plate (7), lower fixing plate (8), and bracing rod (20); The pre-embedded sleeve (5) is pre-embedded in the concrete outer wall (15), and one end of the double-headed screw (6) is screwed into the pre-embedded sleeve (5); the end of the cantilevered main square steel (1) near the concrete outer wall (15) is provided with a round hole, the other end of the double-headed screw (6) is inserted through the round hole, and it is tightened by a nut, so that the cantilevered main square steel (1) is fixed to the concrete outer wall (15) and cantilevered to the outside; The sliding connector (2) has a sleeve structure that is adapted to the outer contour of the cantilever main square steel (1), so that it is slidably sleeved on the cantilever main square steel (1) and can move along its axial direction to adjust the installation position. The sliding connector (2) includes a main frame (201) whose inner contour matches the outer diameter of the square steel tube (101) of the cantilevered main square steel (1), two pull rings (202) vertically welded to the upper and lower surfaces of the main frame (201), a shaft cylinder (203) vertically welded to the geometric center of the upper and lower surfaces of the main frame (201), and a laser pen sleeve (205) set on the upper outer side of one side of the main frame (201); the shaft cylinder (203) has a through hole (2031) for inserting the disc buckle upright (16) of the disc buckle scaffold. The upper fixing plate (7) includes a first base plate (701), first flanges (702) located on both sides of the first base plate (701), a first rectangular steel plate (703) located at the upper end of the upper fixing plate (7) and the first flanges (702), a pair of double ear holes (7031) welded on the first rectangular steel plate (703), and a plurality of "7" shaped slots (7021) evenly distributed on the two first flanges (702). The lower fixing plate (8) includes a second base plate (801), second flanges (802) located on both sides of the second base plate (801), and a second rectangular steel plate (803) located at the upper end of the second base plate (801) and the second flanges (802). Multiple straight slots (8021) with a downward inclination of 45° are evenly distributed on the two second flanges (802). The upper fixing plate (7) and the lower fixing plate (8) are respectively anchored to the corresponding elevation positions of the concrete outer wall (15) by double-headed screws (6) and nuts, forming the anchoring base points for the upper tie and the lower support; The strut (20) is connected between the sliding connector (2) and the upper fixed plate (7) and the lower fixed plate (8). One end of the strut (20) is connected to the pull ring on the sliding connector (2) through an ultra-short bolt (11), and the other end is connected and locked to the "7" shaped slot (7021) on the upper fixed plate (7) or the straight slot (8021) on the lower fixed plate (8) through the rod limiting bolt (10), forming a stable triangular support system.

2. The quick-assembly cantilever square steel system for disc-lock scaffolding according to claim 1, characterized in that, The pre-embedded sleeve (5) is a steel cylindrical component, which includes a support ring (501), a cylinder (502), a double hook ring (503), and a friction ring (504). The cylinder (502) is welded to the rear axis of the support ring (501). The inner surface of the cylinder (502) is threaded throughout for screwing with the double-ended screw (6). A closed end cap is provided at one end of the cylinder (502) away from the support ring (501). The double hook ring (503) is sleeved on the outer circumference of the cylinder (502) near the closed end. The double hook ring (503) includes an annular body and a pair of metal hooks symmetrically welded to its outer side. The whole structure is in the shape of an arc and is used to hook the surrounding steel bars for additional fixation. Multiple friction rings (504) are also welded at intervals along the axial spacing of the cylinder (502) to enhance the gripping force and pull-out resistance with the concrete.

3. The quick-assembly cantilever square steel system for disc-lock scaffolding according to claim 2, characterized in that, The cantilevered main square steel (1) is composed of a square steel pipe (101), an anchor plate (102) and a supporting triangular iron (104). A rectangular anchor plate (102) is vertically welded to the tail end of the square steel pipe (101). The upper and lower edges of the anchor plate (102) are respectively provided with three-section circular connecting sections (103). A supporting triangular iron (104) is also provided at the tail end of the square steel pipe (101) near the anchor plate (102). Two round holes (1021) are made on the upper part of the anchor plate (102) for inserting the double-ended screw (6), and multiple first horizontal central axis through holes (1011) are made on the central axis of the side of the square steel tube (101) for installing the square steel limit bolt (9).

4. The quick-assembly cantilever square steel system for disc-lock scaffolding according to claim 3, characterized in that, It also includes a square tube central shaft (3) and an extended square rod section (4). The square tube central shaft (3) includes a three-section structure. The cross-sectional dimensions of its two end sections are suitable for insertion into the inner cavity of the cantilever main square steel (1). The cross-sectional dimensions of its middle section are consistent with those of the cantilever main square steel (1) to achieve axial positioning. The cross-section of the extended square rod section (4) is consistent with that of the cantilever main square steel (1) and is inserted into the far end of the square tube central shaft (3) to jointly form an extension structure of the cantilever load-bearing body. This extension structure is locked through the square steel limiting bolt (9) to ensure connection strength and overall stability.

5. The quick-assembly cantilever square steel system for disc-lock scaffolding according to claim 4, characterized in that, The square tube central shaft cylinder (3) is composed of a main square tube (301) and a rectangular sleeve (302). The outer diameter of the main square tube (301) matches the inner diameter of the cantilever main square steel (1) and is inserted into the end of the cantilever main square steel (1) to achieve axial extension. Second horizontal central shaft through holes (3011) are opened on the main square tube (301) at a distance of 100mm and 200mm from both ends of the rectangular sleeve (302) to be used for the fixed connection between the square steel limiting bolt (9) and the cantilever main square steel (1). The rectangular sleeve (302) is fixedly installed in the middle of the main square tube (301). Its cross-sectional dimensions are consistent with the cross-section of the cantilever main square steel (1). It is used to provide centering limit and enhance bending stiffness at the connection. After assembly, the main square tube (301) extends 300mm on each side of the rectangular sleeve (302) to form a reliable insert-type connection section, which together constitutes a detachable cantilever structure extension component.

6. The quick-assembly cantilever square steel system for disc-lock scaffolding according to claim 5, characterized in that, The extended square rod segment (4) is a rectangular square tube structure with the same cross-sectional dimensions as the cantilever main square steel (1). It is used to connect with the central shaft cylinder (3) of the square tube to extend the cantilever span. On the extended square rod segment (4), a third horizontal central shaft through hole (401) is provided at a distance of 100mm and 200mm from both ends and at the center of the square tube along its axial direction. This hole is used for the square steel limiting bolt (9) to pass through, so as to achieve reliable fixation and axial positioning of the extended square rod segment (4) and the adjacent connecting parts.

7. The quick-assembly cantilever square steel system for disc-lock scaffolding according to claim 6, characterized in that, It also includes a warning plate (704), which is a red rectangular plate with a width that matches the middle gap of the double ear holes (7031). A cylindrical counterweight (7041) is provided at its tail end. The warning plate (704) is hinged between the two double ear holes (7031) through a through shaft (7042), and rotates 90° around the through shaft (7042). Its head end is flush with the first bottom plate (701) of the upper fixed plate (7), and a pin (7043) is provided in the middle of that end. A semi-circular hole (7012) is provided in the middle of the longitudinal central axis of the first base plate (701) at the bottom end of the first rectangular steel plate (703). When the upper fixing plate (7) is installed close to the concrete outer wall (15), the pin (7043) at the head end of the warning plate (704) is inserted into the semi-circular hole (7012) of the first base plate (701). Under the friction constraint of the outer wall surface, it overcomes the torque of the counterweight (7041) and keeps the warning plate (704) in a horizontal storage state. If there is a loose gap between the upper fixing plate (7) and the concrete outer wall (15), the pin (7043) will disengage from the semi-circular hole (7012) and the wall surface and lose the friction constraint. At this time, the counterweight (7041) drives the warning plate (704) to rotate around the through-hole axis (7042) to a vertical state, forming a conspicuous visual warning.

8. The quick-assembly cantilever square steel system for disc-lock scaffolding according to claim 7, characterized in that, The strut (20) is assembled from a strut head (12), a cylindrical tube (13), and an extended cylindrical tube section (14) to form a length-adjustable rod. The strut head (12) consists of an earring pull head cover (1201) and a cylindrical steel tube (1202). One end of the cylindrical steel tube (1202) is convexly threaded to adjust the overall length of the strut (20) by rotation, and the other end is sleeved with the earring pull head cover (1201). The earring pull head cover (1201) is a circular metal cover with a pull ring (12011) welded to the upper end. The pull ring (12011) consists of a straight line segment and a semi-circular arc. The center of the pull ring (12011) has a pull ring hole (12012) for the rod limiting bolt (10) or an ultra-short bolt (11) to pass through. The inner hole of the cylindrical tube (13) is machined with internal threads along its entire length. The thread size matches the size of the external convex thread of the cylindrical steel tube (1202) of the bracing rod head (12). The two bracing rod heads (12) are screwed into the cylindrical tube (13) from both ends. By rotating to adjust the extension length, the overall bracing rod (20) can be infinitely adjusted in length within the range of 2800mm to 3600mm. A radial through hole (1301) is provided on the side wall of the middle section of the cylindrical tube (13) for inserting an iron rod or special tool to assist in rotation, which facilitates the application of force and positioning during the adjustment process. The extended cylindrical tube segment (14) includes a solid cylindrical bar segment (1401) and a hollow cylindrical tube segment (1402). The end face of the solid cylindrical bar segment (1401) is coaxially aligned and fixedly connected with the beginning end face of the hollow cylindrical tube segment (1402), so that the axis of the solid cylindrical bar segment (1401) coincides with the axis of the hollow cylindrical tube segment (1402), together forming a continuous extended shaft; the hollow cylindrical tube segment (1402) The inner hole of 402) is machined with internal threads along its entire length. The size of the thread matches the size of the external convex thread rolling of the round steel tube (1202) of the bracing rod head (12). The solid round bar segment (1401) is a solid round bar. Its cross-sectional outer diameter is consistent with the outer diameter of the round steel tube (1202) of the bracing rod head (12). The solid round bar segment (1401) is machined with external convex thread rolling along its entire length and screwed into the central cylinder (13) of the round tube.

9. The quick-assembly cantilever square steel system for disc-lock scaffolding according to claim 8, characterized in that, The bottom surface of the upper fixing plate (7) is provided with a first two-section circular connecting section (705) for interlocking with the three-section circular connecting section (103) at the end of the anchor plate (102) of the cantilever main square steel (1); the top surface of the lower fixing plate (8) is provided with a second two-section circular connecting section (804) for interlocking with the three-section circular connecting section (103) at the end of the anchor plate (102) of the cantilever main square steel (1).

10. The construction method of the special quick-assembly cantilever square steel system for disc-lock scaffolding according to claim 9, characterized in that, The steps are as follows: S1: After the steel reinforcement (21) of the wall is tied, when preparing to close the formwork (19) of the shear wall, make positioning holes on the formwork (19) for the later installation of the cantilever main square steel (1), upper fixing plate (7) and lower fixing plate (8). Then, use a double-ended screw (6) to pass through the drilled hole of the formwork (19) and screw it into the embedded sleeve (5); then, rotate the matching nut from the other end of the double-ended screw (6) and lock it; by tightening the nut, the support ring (501) of the embedded sleeve (5) and the screw of the double-ended screw (6) are connected. The mother is tightly attached to the inner and outer surfaces of the template (19) to achieve precise positioning and fixation of the embedded sleeve (5); the double hook ring (503) of the embedded sleeve (5) is designed to hook onto the longitudinal and transverse steel bars (21) in the wall to enhance its pull-out resistance; finally, the concrete (22) of the shear wall is poured. After the strength of the concrete (22) meets the requirements, the nuts at both ends of the double-headed screw (6) are loosened and removed, and the double-headed screw (6) is screwed out from the embedded sleeve (5) and the template (19) to remove the template (19); S2: After the template (19) is removed, install the double-headed screws (6) of the cantilever main square steel (1) in groups of two, and install the double-headed screws (6) of the upper fixing plate (7) in groups of three, with equal spacing exposed on the outer wall; then pass the round hole (1021) on the anchor plate (102) of the cantilever main square steel (1) through the double-headed screws (6); finally, install the nuts that match each double-headed screw (6) and screw them in so that the nuts firmly attach the anchor plate (102) to the outer wall, thereby realizing the complete installation of the entire cantilever main square steel (1) of the outer frame; the installation method of the upper fixing plate (7) is the same; S3: For the installation of the cantilevered main square steel (1), upper fixing plate (7) and lower fixing plate (8) at the corner of the building, it is necessary to process them into external corner cantilevered main square steel (23), external corner upper fixing plate (24) and external corner lower fixing plate; compared with the cantilevered main square steel (1), the external corner anchor plate (2301) of the external corner cantilevered main square steel (23) is processed into an external corner shape and fits the external corner wall surface, while the rest remains the same; the first external corner bottom plate (2401) of the external corner upper fixing plate (24) and the second external corner bottom plate of the external corner lower fixing plate are processed into a 90° bent right angle to fit the external corner wall surface; the third elongated hole (24011) of the external corner upper fixing plate (24) and the fourth elongated hole of the external corner lower fixing plate are added to each external corner upper fixing plate (24) and external corner lower fixing plate, that is, the external corner upper fixing plate (24) and external corner lower fixing plate have two elongated holes reserved on each external corner wall surface, and the height positions are staggered; S4: Install two sliding connectors (2) on the square steel tube (101) of each cantilever main square steel (1); slide the two sliding connectors (2) onto the square steel tube (101) of the cantilever main square steel (1) respectively, and initially position them at 100mm and 1000mm away from the far outer wall end; then, at 100mm away from the far outer wall end of the cantilever main square steel (1), use the screw of the square steel limiting bolt (9) to pass through the first horizontal central axis through hole (1011) of the cantilever main square steel (1) and the limiting hole (204) of the sliding connector (2) at the same time, and lock them with the square steel limiting bolt nut (901) to realize the position locking of a single sliding connector (2) on the square steel tube (101); S5: Fit the disc buckle upright (16) onto the cylinder (203) of the sliding connector (2); then, adjust the orientation of the round hole in the tube wall of the disc buckle upright (16) so that it is aligned with the through hole (2031) on the cylinder (203) of the sliding connector (2); furthermore, use a pin (17) to pass through the round hole of the disc buckle upright (16) and the through hole (2031) on the cylinder (203) to lock the disc buckle upright (16) and the sliding connector (2); finally, after all the disc buckle uprights (16) are erected, erect a disc buckle scaffold no more than 4m high on the cantilevered main square steel (1); S6: Assemble and install the struts (20) on the floor. First, assemble according to the required strut length on site: when the required length is 2800mm to 3600mm, select two strut heads (12) and screw them into the central tube (13) from both ends to assemble a standard strut (20); when the required length exceeds 3600mm, the central tube (13) must be screwed to one or more extended round tube sections (14) to form an extended assembly, and then select two strut heads (12) and screw them into the assembly from both ends to assemble an extra-long strut (20); then install the struts (20) above. Installation: Place the pull rings (12011) at the lower ends of the two upper struts (20) on the outside of the two upper pull rings (202) of the sliding connector (2), respectively. Use two ultra-short bolts (11) to pass through from the inside to the outside, passing through the round holes (2021) of the upper pull rings (202) of the sliding connector (2) and the round holes (12012) of the pull rings (12011) of the strut head (12), and tighten with nuts to achieve the lower end hinge. Then, finely adjust the strut head (12) at the upper end of the upper strut (20) so that its pull ring round hole (12012) is aligned with the one fixed to the concrete exterior wall (15). The lower end of a certain "7"-shaped slot (7021) of the upper fixed plate (7) is approached, and a rod limiting bolt (10) is passed through the pull ring round hole (12012) of the two upper bracing rod heads (12) at the same time. The two ends of the rod limiting bolt (10) are supported on the corresponding "7"-shaped slot (7021) of the first flange (702) of the upper fixed plate (7). Finally, the bracing rod (20) is tightened by rotating the central cylinder (13) of the round tube, so that it is under tension and thus the load of the cantilevered main square steel (1) is reliably transferred to the upper fixed plate (7); the installation method of the lower bracing rod (20) Similar to the upper bracing rod (20), it is hinged to the lower ring (202) of the sliding connector (2) by two ultra-short bolts (11) inserted from the inside to the outside. The other end is supported by the end of a 45° downward-sloping slot (8021) of the lower fixed plate (8) by the rod limiting bolt (10), thus forming a stable lower support. Finally, the length of the entire bracing rod (20) is adjusted by the radial through hole (1301) of the cylindrical tube (13) of the bracing rod (20) so that the cantilevered main square steel (1) connected to the bracing rod (20) can achieve the effect of pressure transmission with the upper fixed plate (7). S7: The length of the cantilevered main square steel (23) at the corner of the building is longer than that of the cantilevered main square steel (1) and is subject to a larger bending moment. Therefore, two bracing rods (202) need to be installed on the lower side of the sliding connector (2) to provide upward support. The connection method here needs to be adjusted: the single rod limiting bolt (10) used to connect the upper fixing plate (7) is replaced with two ultra-short bolts (11), which are used to connect the two bracing rods (20) below, so that the four bracing rods (20) can provide upward and downward support and limit the single cantilevered main square steel (23) in four directions. S8: When a suspended concrete corridor needs to be constructed in a building, a platform is erected for the cantilever square steel system to provide support. First, the two sides of the outer wall in front of the formwork (19) of the concrete outer wall (15) of the lower floor where the suspended concrete corridor needs to be erected are positioned. Pre-embedded sleeves (5) are embedded at fixed points on the two sides of the outer wall to create conditions for the later installation of the upper fixing plate (7), the lower fixing plate (8) and the cantilever main square steel (1). Next, after the concrete (22) of the concrete exterior wall (15) reaches its strength after demolding, use double-ended screws (6) and nuts to install the cantilevered main square steel (1), upper fixing plate (7) and lower fixing plate (8); then, according to the design requirements, install the upper tie rod (20) and the lower tie rod (20), and effectively connect the sliding connector (2) with the upper fixing plate (7) and the lower fixing plate (8) to form a lower support and upper pull structure; furthermore, insert the square tube central cylinder (3) into the end of the square steel tube (101) of the cantilevered main square steel (1) and use two square steel limiting bolts (9) to tighten and limit the cantilevered main square steel (1) and the square tube central cylinder (3); then, use a double-ended screw (6) and nuts to install the cantilevered main square steel (1), upper fixing plate (7) and lower fixing plate (8) ...8) and lower fixing plate (8) to install the cantilevered main square steel (1), upper fixing plate (8) and lower fixing plate (8) to install the cantilevered main square steel (1), upper fixing plate (8) and lower fixing plate (8) to install the cantilevered main square steel (1), upper fixing plate (8) and lower fixing plate (8) to install the cantilevered main square steel (1), upper fixing plate (8) and lower fixing plate (8) to install the cantilevered main square steel (1), upper fixing plate The rectangular pole segment (4) is connected to the other end of the square tube central cylinder (3) and tightened with two square steel limiting bolts (9) to extend the component until the horizontal length of the suspended concrete corridor to be erected is connected by continuous main square steel components; finally, the spacing of the disc buckle uprights (16) of the disc buckle scaffold erected according to the design requirements of several sliding connectors (2) is positioned, and the sliding connectors (2) that can be limited by square steel limiting bolts (9) are limited; the disc buckle uprights (16) are connected at the cylinder (203) of each sliding connection (2) according to the design requirements and limited and locked with pins (17), and then the entire disc buckle scaffold is erected; S9: After the disc-lock scaffolding is erected, it is necessary to test whether the entire supporting square steel system, consisting of the cantilevered main square steel (1), the square tube central axis cylinder (3), and the extended square rod section (4), will deflect. The test method is as follows: Insert a laser pointer (18) into the laser pointer sleeve (205) in the sliding connector (2) closest to one side of the concrete outer wall (15). The laser pointer (18) should be horizontal and able to emit a horizontal laser beam. Then, adjust the direction of the laser pointer (18) so that it is aligned with the square steel tube (101) of the cantilevered main square steel (1). One edge is parallel; furthermore, follow the direction of the laser pointer (18) to see if the light can pass smoothly through the cylinder (2051) of the laser pointer sleeve (205) of the second sliding connector (2); check the third, fourth... sliding connectors in this way; when the light cannot pass through the cylinder (2051), it is necessary to check whether the height of the square tube is sagged, and make a slight adjustment to the length of the adjacent bracing rod (20) to make the cylinder (2051) pass smoothly through the laser beam; operating in this way can ensure the levelness of the entire supporting square steel system; S10: When it is necessary to erect a protective canopy for engineering vehicles to pass through parallel to the building side, on the basis of erecting a cantilevered disc-lock scaffold, the main body of the protective canopy roof is formed by extending the square tube central shaft (3) and the extended square rod section (4) to a suitable length; then, two strip-shaped disc-lock scaffolds are erected, and the height is such that the top disc-lock uprights are connected to the lower shaft (203) of the sliding connector (2) reserved on the extended square steel, and locked with pins (17); finally, the protective plate is installed as the roof on the extended square steel composed of the extended square rod section (4) of the extended square tube central shaft (3) to achieve roof protection; S11: When it is necessary to erect a pedestrian safety passage protective shed perpendicular to the building side, extend the cantilevered main square steel (1), square tube central axis cylinder (3) and extended square pole section (4) of the safety passage area to form the main body of the roof square steel; then, erect two strip-shaped disc-lock scaffolds perpendicular to the building to become the left and right boundaries of the passage, and erect the height to the point that the top upright (16) is connected to the lower axis cylinder (203) of the sliding connector (2) reserved on the extended square steel and locked with a pin (17); finally, use protective plates as the roof to install on the extended square steel composed of the extended square tube central axis cylinder (3) and extended square pole section (4) to achieve roof protection.

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