Suspension type round bucket construction operation platform and synchronous installation method thereof

Abstract

The invention discloses a suspension type round bucket construction operation platform and a synchronous mounting method thereof, and relates to the technical field of civil engineering, a steel formwork is vertically and fixedly arranged on the ground, the longitudinal section of a flange plate body is of an L-shaped structure, and more than two H-shaped limiting plates are uniformly arranged on the outer circumferential surface of the flange plate body; the H-shaped limiting plate is rotatably connected with an automatic reset hook, one end of the square spring is connected with the H-shaped limiting plate, the other end of the square spring is connected with the automatic reset hook, the flange plate body is provided with a double-layer annular rib plate structure, the edge of the double-layer annular rib plate structure is provided with a safety protection mechanism, and the steel formwork is further provided with an anchoring mechanism. The device can be used for hanging high and large stand columns on a steel formwork in high-altitude operation and synchronously installed with the steel formwork, the cost is reduced by 40% compared with an elevator cage, the installation efficiency is improved by two times, meanwhile, the problems of soft foundation treatment and site limitation are solved, ground preassembling and aerial tool-free disassembling and assembling are achieved, construction safety is ensured, and the construction efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and more specifically, to a suspended circular bucket construction operation platform and its synchronous installation method. Background Technology

[0002] During bridge construction, it is necessary to carry out construction on the top of the columns or the attached facilities on the surface of the columns, so temporary operating platforms need to be erected around the columns.

[0003] Traditional operating platforms typically employ either ground-mounted steel pipe platforms or ladder cages. Ground-mounted steel pipe platforms are constructed from steel pipes and require the installation of uprights, horizontal bars, base plates, diagonal braces, and scissor braces, resulting in complex construction processes, long erection periods, poor stability, and significant risks. Ladder cages, on the other hand, are integrated structures installed using a truck crane, with sections hoisted and assembled on-site. They require high foundation bearing capacity, a certain amount of operating space, and generally necessitate foundation treatment. They also require guy ropes or connections to third-party structures to ensure overall stability. Ladder cages are simple to install and have a short installation period, but they are more expensive. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention proposes a suspended circular bucket construction operation platform and its synchronous installation method. It can be applied to high-altitude operations on tall columns, suspended on steel formwork and installed synchronously with the steel formwork. Compared with ladder cages, it reduces costs by 40% and increases installation efficiency by 2 times. At the same time, it avoids the use of ground-mounted ladder cages and steel pipe platforms, solves the problems of soft foundation treatment and site limitations, realizes ground pre-installation and tool-free disassembly and assembly in the air, ensures construction safety, and improves construction efficiency.

[0005] To achieve this objective, the present invention adopts the following technical solution: This invention provides a suspended circular bucket construction operation platform, including a steel formwork, a boltless L-shaped flange, a double-layer annular stiffening plate structure, a safety protection mechanism, and an anchoring mechanism. The steel formwork is vertically fixed to the ground, and a boltless L-shaped flange is provided at the top of the steel formwork. The boltless L-shaped flange includes a flange body, an H-shaped limiting plate, an automatic reset hook, and a square spring. The longitudinal section of the flange body is an L-shaped structure. Two or more H-shaped limiting plates are evenly arranged on the outer circumference of the flange body. An automatic reset hook is rotatably connected to the H-shaped limiting plate. One end of the square spring is connected to the H-shaped limiting plate, and the other end of the square spring is connected to the automatic reset hook. A double-layer annular stiffening plate structure is provided on the flange body, and a safety protection mechanism is provided at the edge of the double-layer annular stiffening plate structure. An anchoring mechanism is also provided on the steel formwork.

[0006] In a preferred embodiment of the present invention, the double-layer annular rib structure includes an inner annular rib, an outer annular rib, and a radial rib group. The flange body is provided with a radial rib group, the inner annular rib and the outer annular rib are arranged concentrically, and both the inner annular rib and the outer annular rib are fixed on the radial rib group.

[0007] In a preferred embodiment of the present invention, the radial rib group consists of two or more reinforcing radial ribs and two or more densified radial ribs, and two or more densified radial ribs are provided between two adjacent reinforcing radial ribs.

[0008] In a preferred embodiment of the present invention, the safety protection mechanism includes a guardrail and a fall-prevention grid, the guardrail being hinged to the outer annular rib, and the fall-prevention grid being detachably installed below the outer annular rib.

[0009] In a preferred embodiment of the present invention, the guardrail is further provided with steel bar lifting rings.

[0010] In a preferred embodiment of the present invention, the anchoring mechanism includes a diagonal brace, a guy rope, an anchor, and a length adjuster. The diagonal brace and guy rope are provided on the outer wall of the steel template. An anchor is connected to the bottom end of both the diagonal brace and the guy rope, and the anchor is fixed to the ground. A length adjuster is also provided on the diagonal brace and the guy rope.

[0011] In a preferred embodiment of the present invention, the anchor consists of a ground nail and a universal joint.

[0012] This invention also provides a method for the synchronous installation of a suspended circular bucket construction operation platform, comprising the following steps: S10. Overall hoisting of steel formwork; S20. The pre-fabricated operating platform on the ground is hoisted to the top of the steel formwork, so that the flange body of the boltless L-shaped flange overlaps with the flange on the top of the steel formwork to achieve flange docking. At this time, the automatic reset hook of the boltless L-shaped flange will hook onto the flange of the steel formwork to achieve automatic locking. S30. Install anchoring mechanism and reinforce steel formwork with diagonal bracing and guy ropes.

[0013] In a preferred embodiment of the present invention, step S20, manufacturing the operating platform includes the following steps: S21. Fabrication of a double-layer ring-shaped stiffener structure: Determine the center point on the ground, and set the inner ring-shaped stiffener and outer ring-shaped stiffener concentrically according to the position of the center point. Then, weld and fix the radial stiffener group composed of reinforcing radial stiffener and dense radial stiffener simultaneously to the inner ring-shaped stiffener and outer ring-shaped stiffener. S22. Making a boltless L-shaped flange: Install an automatic reset hook and a square spring on the H-shaped limit plate, and connect the two ends of the square spring to the H-shaped limit plate and the automatic reset hook respectively. Then weld and fix the H-shaped limit plate to the outer circumference of the flange body to obtain a boltless L-shaped flange. Then weld and fix the flange body to the reinforcing rib group. S23. Install safety protection mechanism: Install the bottom end of the guardrail to the outer ring reinforcement through a hinge structure, and detachably install the anti-fall grid below the outer ring reinforcement.

[0014] The beneficial effects of this invention are as follows: 1. Construction period reduced by 50%: The technical solution of ground synchronous assembly + tool-free installation is adopted. The synchronous hoisting and automatic fixing only require adjustment of the diagonal bracing later, which greatly shortens the construction period.

[0015] 2. No foundation treatment required: The suspended load-bearing structure can transfer the load to the steel formwork columns, making it suitable for soft foundations such as silt and slopes, as well as high-altitude operations.

[0016] 3. Improved anti-overturning performance: By dispersing stress through radial ribs and adaptively adjusting the length of diagonal braces and guy ropes, the anti-overturning performance of this device is greatly improved, and the measured wind load resistance reaches level 8 wind.

[0017] 4. Enhanced safety: The combination of anti-fall mesh and folding railings provides double protection, preventing construction workers from accidentally falling from the operating platform. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of a suspended circular bucket construction operation platform provided in a specific embodiment of the present invention.

[0019] Figure 2 This is a top-view structural diagram of a double-layer annular stiffening plate structure. Figure 3 This is a top view of the structure of a boltless L-shaped flange; Figure 4 yes Figure 1 A magnified view of a section at point A in the middle; Figure 5 yes Figure 4 A structural diagram viewed from the left. Figure 6 yes Figure 4 A top-down structural diagram; Figure 7 This is a construction flowchart of a synchronous installation method for a suspended circular bucket construction operation platform provided by a specific embodiment of the present invention; Figure 8 It is a construction flowchart for making the operating platform.

[0020] 1. Steel formwork; 2. Boltless L-shaped flange; 21. Flange body; 22. H-type limiting plate; 23. Automatic reset hook; 24. Square spring; 3. Double-layer ring-shaped rib structure; 31. Inner ring-shaped rib; 32. Outer ring-shaped rib; 33. Reinforced radial rib; 34. Densified radial rib; 4. Safety protection mechanism; 41. Guardrail; 42. Rebar lifting ring; 5. Anchoring mechanism; 51. Diagonal brace; 52. Guy rope; 53. Anchor. Detailed Implementation

[0021] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0022] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] like Figures 1-6 As shown, the embodiment provides a suspended circular bucket construction operation platform, including a steel template 1, a boltless L-shaped flange 2, a double-layer annular stiffening plate structure 3, a safety protection mechanism 4, and an anchoring mechanism 5. The steel template 1 is vertically fixed on the ground, and the boltless L-shaped flange 2 is provided at the top of the steel template 1. The boltless L-shaped flange 2 includes a flange body 21, an H-shaped limiting plate 22, an automatic reset hook 23, and a square spring 24. The longitudinal section of the flange body 21 is an L-shaped structure. Two or more H-shaped limiting plates 22 are evenly arranged on the outer circumference of the flange body 21. The automatic reset hook 23 is rotatably connected to the H-shaped limiting plate 22. One end of the square spring 24 is connected to the H-shaped limiting plate 22, and the other end of the square spring 24 is connected to the automatic reset hook 23. The flange body 21 is provided with a double-layer annular stiffening plate structure 3, and the safety protection mechanism 4 is provided at the edge of the double-layer annular stiffening plate structure 3. The steel template 1 is also provided with an anchoring mechanism 5.

[0028] In this embodiment, the steel formwork 1 is preferably a cylindrical structure. Tall columns can be constructed by pouring concrete into the steel formwork 1. The steel formwork 1 is arranged vertically, with its bottom fixed to the ground. A flange is provided at the top of the steel formwork 1, the width of which is greater than the thickness of the steel formwork 1, thus forming a stepped structure at the top of the steel formwork 1. A boltless L-shaped flange 2 is fixedly installed on the top of the steel formwork 1. The flange body 21 is preferably an annular structure, and its longitudinal section is L-shaped. Two or more H-shaped limiting plates 22 are provided, evenly fixed on the outer circumference of the flange body 21. These plates, together with the L-shaped flange body 21, form a U-shaped groove and engage with the flange at the top of the steel formwork 1 for positioning. The automatic reset hook 23 has an approximately V-shaped structure, and when the boltless L-shaped flange 2... When moving downwards under gravity, the flange at the top of the steel formwork 1 contacts the inclined surface of the automatic reset hook 23, pushing it to rotate. Once the flange at the top of the steel formwork 1 is fully engaged in the U-shaped groove, it disengages from the automatic reset hook 23. At this point, the square spring 24, acting as a spring force, drives the automatic reset hook 23 back to a vertical position, hooking the flange at the top of the steel formwork 1, thus restricting the vertical movement of the operating platform and preventing overturning. The square spring 24 is a common type of spring and will not be described in detail here. The double-layer annular stiffening plate structure 3 provides a place for construction workers to stand and place materials, facilitating high-altitude construction. The safety protection mechanism 4 protects construction workers from falls. The anchoring mechanism 5 provides auxiliary support for the steel formwork 1. Furthermore, all components used in this embodiment are commercially available.

[0029] Specifically, such as Figure 2 As shown, the double-layer annular stiffener structure 3 includes an inner annular stiffener 31, an outer annular stiffener 32, and a radial stiffener group. The radial stiffener group is provided on the flange body 21. The inner annular stiffener 31 and the outer annular stiffener 32 are arranged concentrically, and both the inner annular stiffener 31 and the outer annular stiffener 32 are fixed on the radial stiffener group.

[0030] In this embodiment, both the inner annular rib 31 and the outer annular rib 32 are made of steel reinforcement and have a circular structure. The radial rib group is used to connect and fix the inner annular rib 31 and the outer annular rib 32, thereby forming a disc-shaped platform. The concentric ring with a smaller diameter located inside the inner annular rib 31 is welded with an anti-slip steel plate for construction workers to stand on; the concentric ring with a larger diameter located between the inner annular rib 31 and the outer annular rib 32 is used to store materials.

[0031] Specifically, such as Figure 2As shown, the radial rib group consists of two or more reinforcing radial ribs 33 and two or more dense radial ribs 34, which are arranged radially and uniformly along the flange body 21, and two or more dense radial ribs 34 are provided between two adjacent reinforcing radial ribs 33.

[0032] In this embodiment, both the reinforcing radial ribs 33 and the denser radial ribs 34 are made of steel reinforcement and are straight rod-shaped structures. The spacing between two adjacent radial ribs is less than or equal to 7 cm, and the angle is less than or equal to 2° to ensure the formation of a standing platform and improve torsional stiffness. The ends of the reinforcing radial ribs 33 and the denser radial ribs 34 are fixed to the outer circumference of the flange body 21 by welding, and the central axes of the reinforcing radial ribs 33 and the denser radial ribs 34 coincide with the diameter of the flange body 21. Two or more reinforcing radial ribs 33 and two or more dense radial ribs 34 form a radial structure centered on the center point of the flange body 21.

[0033] Specifically, such as Figure 1 As shown, the safety protection mechanism 4 includes a guardrail 41 and a fall-prevention grid. The guardrail 41 is hinged to the outer annular rib 32, and the fall-prevention grid is detachably installed below the outer annular rib 32.

[0034] In this embodiment, the guardrail 41 consists of two or more assembly units, each composed of welded steel columns and crossbars forming a frame structure. When needed, the assembly units are unfolded and rotated to a vertical position, where two or more units connect end-to-end to form a closed ring structure, preventing workers from accidentally falling from the platform. When not in use, the assembly units are folded up and rotated to a horizontal position for easy storage and to eliminate safety hazards. The fall-prevention mesh uses a detachable connection method, providing double protection, and the mesh aperture is less than or equal to 3cm.

[0035] Specifically, such as Figure 1 As shown, steel bar hanging rings 42 are also installed on the guardrail 41.

[0036] In this embodiment, the steel bar lifting ring 42 can be connected to the hook of the crane, thereby facilitating the hoisting of the operating platform to the top of the steel formwork 1.

[0037] Specifically, such as Figure 1 As shown, the anchoring mechanism 5 includes a diagonal brace 51, a guy rope 52, an anchor 53, and a length adjuster. The diagonal brace 51 and the guy rope 52 are provided on the outer wall of the steel template 1. The bottom ends of the diagonal brace 51 and the guy rope 52 are connected to the anchor 53, and the anchor 53 is fixed to the ground. The diagonal brace 51 and the guy rope 52 are also provided with a length adjuster.

[0038] In this embodiment, the diagonal brace 51 is a straight rod, and both the diagonal brace 51 and the guy rope 52 are arranged at an angle, which can provide auxiliary support for the steel formwork 1. The length adjuster is existing technology; for example, a length adjuster for adjusting the length of rods has been disclosed in Chinese Utility Model Patent No. CN204909605U, and a length adjuster for adjusting the length of wire ropes has been disclosed in Chinese Utility Model Patent No. CN219136110U, so it will not be described again here. The length adjuster allows for adjustment of the lengths of the diagonal brace 51 and the guy rope 52, thereby changing the inclination of the steel formwork 1 to accommodate construction operations with different column inclinations. The anchor 53 is used to fix the bottom ends of the diagonal brace 51 and the guy rope 52 to the ground.

[0039] Specifically, such as Figure 1 As shown, anchor 53 consists of ground nails and universal joints.

[0040] In this embodiment, the anchor 53 adopts a ground nail + universal adapter, which can reduce the ground flatness requirements.

[0041] like Figure 7 As shown, this embodiment also provides a method for the synchronous installation of a suspended circular bucket construction operation platform, including the following steps: S10, the steel formwork 1 is hoisted as a whole and fixed vertically to the ground; S20. Simultaneously hoist the pre-fabricated operating platform on the ground to the top of the steel formwork 1, so that the flange body 21 of the boltless L-shaped flange 2 overlaps with the flange on the top of the steel formwork 1 to achieve flange docking. At this time, the automatic reset hook 23 of the boltless L-shaped flange 2 will hook onto the flange of the steel formwork 1 to achieve automatic locking. S30. Install anchoring mechanism 5 to reinforce steel formwork 1 with diagonal bracing 51 and guy rope 52.

[0042] Specifically, such as Figure 8 As shown, step S20, the creation of the operating platform includes the following steps: S21. Fabrication of a double-layer ring-shaped stiffener structure 3: Determine the center point on the ground, and set the inner ring-shaped stiffener 31 and the outer ring-shaped stiffener 32 concentrically according to the position of the center point. Then, weld and fix the radial stiffener group composed of the reinforcing radial stiffener 33 and the dense radial stiffener 34 to the inner ring-shaped stiffener 31 and the outer ring-shaped stiffener 32 at the same time. S22. Fabrication of boltless L-shaped flange 2: Install an automatic reset hook 23 and a square spring 24 on the H-shaped limiting plate 22, and connect the two ends of the square spring 24 to the H-shaped limiting plate 22 and the automatic reset hook 23 respectively, so that the automatic reset hook 23 can generate elastic movement to achieve automatic reset and quickly hook the flange on the top of the steel template 1. Then, weld and fix the H-shaped limiting plate 22 to the outer circumferential surface of the flange body 21 to obtain the boltless L-shaped flange 2. Then, weld and fix the flange body 21 to the reinforcing rib group, and ensure that the center of the flange body 21 coincides with the center point. S23. Install safety protection mechanism 4: Install the bottom end of the guardrail 41 onto the outer ring rib 32 through a hinge structure, and detachably install the anti-fall grid below the outer ring rib 32.

[0043] This invention has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. This invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims are also within the protection scope of this invention.

Claims

1. A suspended circular bucket construction operation platform, characterized in that: The system includes a steel formwork (1), a boltless L-shaped flange (2), a double-layer annular stiffening plate structure (3), a safety protection mechanism (4), and an anchoring mechanism (5). The steel formwork (1) is vertically fixed on the ground. The top of the steel formwork (1) is equipped with a boltless L-shaped flange (2). The boltless L-shaped flange (2) includes a flange body (21), an H-shaped limiting plate (22), an automatic reset hook (23), and a square spring (24). The longitudinal section of the flange body (21) is an L-shaped structure. Two or more H-shaped limiting plates (22) are evenly arranged on the outer circumference surface. An automatic reset hook (23) is rotatably connected to the H-shaped limiting plate (22). One end of the square spring (24) is connected to the H-shaped limiting plate (22), and the other end of the square spring (24) is connected to the automatic reset hook (23). A double-layer annular stiffening plate structure (3) is provided on the flange body (21). A safety protection mechanism (4) is provided at the edge of the double-layer annular stiffening plate structure (3). An anchoring mechanism (5) is also provided on the steel template (1).

2. The suspended circular bucket construction operation platform according to claim 1, characterized in that: The double-layer annular rib structure (3) includes an inner annular rib (31), an outer annular rib (32) and a radial rib group. The flange body (21) is provided with a radial rib group. The inner annular rib (31) and the outer annular rib (32) are arranged concentrically, and both the inner annular rib (31) and the outer annular rib (32) are fixed on the radial rib group.

3. The suspended circular bucket construction operation platform according to claim 2, characterized in that: The radial rib group consists of two or more reinforcing radial ribs (33) and two or more dense radial ribs (34), and two or more dense radial ribs (34) are provided between two adjacent reinforcing radial ribs (33).

4. The suspended circular bucket construction operation platform according to claim 2, characterized in that: The safety protection mechanism (4) includes a guardrail (41) and a fall-prevention grid. The guardrail (41) is hinged to the outer annular rib (32), and the fall-prevention grid is detachably installed below the outer annular rib (32).

5. A suspended circular bucket construction operation platform according to claim 4, characterized in that: The guardrail (41) is also equipped with steel bar hanging rings (42).

6. The suspended circular bucket construction operation platform according to claim 1, characterized in that: The anchoring mechanism (5) includes a diagonal brace (51), a guy rope (52), an anchor (53), and a length adjuster. The steel template (1) is provided with a diagonal brace (51) and a guy rope (52) on its outer side wall. The bottom ends of the diagonal brace (51) and the guy rope (52) are connected to anchors (53), and the anchors (53) are fixed to the ground. The diagonal brace (51) and the guy rope (52) are also provided with length adjusters.

7. A suspended circular bucket construction operation platform according to claim 6, characterized in that: The anchor (53) consists of a ground nail and a universal joint.

8. A method for synchronous installation of a suspended circular bucket construction operation platform according to any one of claims 1 to 7, characterized in that, Includes the following steps: S10, Steel formwork (1) hoisting as a whole; S20. The pre-fabricated operating platform on the ground is hoisted to the top of the steel template (1), and the flange body (21) of the boltless L-shaped flange (2) is overlapped with the flange on the top of the steel template (1) to achieve flange docking. At this time, the automatic reset hook (23) of the boltless L-shaped flange (2) will hook onto the flange of the steel template (1) to achieve automatic locking. S30. Install the anchoring mechanism (5) and reinforce the steel formwork (1) with the diagonal bracing (51) and guy rope (52).

9. The synchronous installation method of the suspended circular bucket construction operation platform according to claim 8, characterized in that, Step S20 involves the following steps in creating the operating platform: S21. Fabricate a double-layer ring-shaped ribbed structure (3): Determine the center point on the ground, and set the inner ring rib (31) and outer ring rib (32) concentrically according to the position of the center point. Then, weld and fix the radial rib group composed of reinforcing radial rib (33) and dense radial rib (34) to the inner ring rib (31) and outer ring rib (32) at the same time. S22. Making a boltless L-shaped flange (2): Install an automatic reset hook (23) and a square spring (24) on the H-shaped limiting plate (22), and connect the two ends of the square spring (24) to the H-shaped limiting plate (22) and the automatic reset hook (23) respectively. Then weld the H-shaped limiting plate (22) to the outer circumference of the flange body (21) to obtain a boltless L-shaped flange (2). Then weld the flange body (21) to the reinforcing rib group. S23. Install safety protection mechanism (4): Install the bottom end of the guardrail (41) onto the outer ring reinforcement (32) through a hinge structure, and detachably install the anti-fall grid below the outer ring reinforcement (32).

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