Modular assembly type axial rigid connection tool suitable for ladder cage

Abstract

The utility model discloses a modular assembly type axial rigidity connection frock suitable for ladder cage relates to frock technical field, including the fixed mechanism for connecting on the ladder cage, be connected with mounting panel on the fixed mechanism, still include the supporting plate, the supporting plate includes horizontal board and vertical board vertically installed on the horizontal board, the horizontal board with mounting panel rotatable connection, still include the connecting beam, one end of connecting beam rotatable connection with vertical board, the other end is used for with building detachable connection, this frock can adapt to the building of different section size and inclination angle, solved the problem that traditional fixed connection can only be limited to main node, cannot flexible adjustment, and, the frock whole adopts modularization design, is convenient for prefabrication, transportation and assembly, and the loading and unloading are convenient, can improve construction efficiency and safety.

Description

Technical Field

[0001] This utility model relates to the field of connection tooling technology, specifically to a modular assembled axial rigid connection tooling suitable for ladder cages. Background Technology

[0002] A ladder cage is a facility used for vertical access and safety protection. It is widely used in high-altitude work environments such as bridge engineering, subway and deep foundation pit construction, building construction and water conservancy and hydropower projects, tunnel entrance construction, and industrial and warehousing sites. Different types of ladder cages (such as steel and aluminum alloy) are suitable for different load and environmental requirements. Rigid connections (wall ties) of ladder cages use traditional directional fixing methods, which can only be fixed at the main nodes, making multi-angle and height adjustments impossible. This places high demands on the dimensions of the building structure and the accuracy of the anchor points, resulting in poor flexibility and adaptability.

[0003] Existing directional fixed connection methods suffer from increased workload, numerous welding clamp operations that can only be fixed at the main node, and the inability to adjust angles and heights. They also have high requirements for building (structure) dimensions and anchor point accuracy, poor flexibility and adaptability, and rigid connections result in significant variations in building (structure) cross-sectional dimensions, inconvenience for construction personnel, long installation cycles, and high risk factors. Violations and risky operations are common. Therefore, there is an urgent need for an axial rigid connection tool suitable for ladder cages that can flexibly, safely, and accurately connect them. Utility Model Content

[0004] This utility model aims to solve the problems of existing axial rigid connecting parts for ladder cages, such as the inability to flexibly adjust to multiple angles and heights, cumbersome installation and removal, and high risk factor.

[0005] To address the aforementioned problems, this utility model provides a modular, assembled, axially rigid connection fixture suitable for ladder cages, including a fixing mechanism for connecting to the ladder cage, with an mounting plate connected to the fixing mechanism; it also includes a support plate, which comprises a horizontal plate and a vertical plate vertically mounted on the horizontal plate, the horizontal plate being rotatably connected to the mounting plate; and a connecting beam, one end of which is rotatably connected to the vertical plate, and the other end being detachably connected to the building.

[0006] The present invention provides a modular, assembled, axially rigid connection fixture suitable for ladder cages, which, compared with the prior art, has the following beneficial effects, but is not limited to: This utility model's modular prefabricated axial rigid connection fixture features a rotatable connection between the horizontal plate and the mounting plate on the support plate, and between the vertical plate and one end of the connecting beam. This allows the connecting beam to be adjusted at any angle in both the horizontal and vertical directions, satisfying adjustment in any direction. The other end of the connecting beam can reach any position, thus enabling flexible connection with the building. Specifically, when the distance between the ladder cage and the building is different, adjusting the angle of the connecting beam allows the other end of the beam to reach the building for anchoring. Therefore, it can adapt to buildings with different cross-sectional dimensions and inclination angles, solving the problem that traditional fixed connections are limited to the main node and cannot be flexibly adjusted. Furthermore, the fixture adopts a modular design, facilitating prefabrication, transportation, and assembly, and is easy to load and unload, improving construction efficiency and safety.

[0007] Furthermore, the fixing mechanism includes a first enclosure plate and a second enclosure plate with identical structures. The first enclosure plate and the second enclosure plate are combined to form an enclosure structure for installation on the axial square steel of the ladder cage. The enclosure structure is equipped with a locking component for detachably connecting the first enclosure plate and the second enclosure plate to form the enclosure structure.

[0008] Furthermore, the first enclosure includes a first U-shaped plate and two first ear plates respectively perpendicularly connected to the outer sides of both ends of the first U-shaped plate; the second enclosure includes a second U-shaped plate and two second ear plates respectively perpendicularly connected to the outer sides of both ends of the second U-shaped plate; the two first ear plates are respectively stacked with the two second ear plates, so that the first enclosure and the second enclosure are combined to form an enclosure structure; the locking component is provided on the correspondingly stacked first ear plates and second ear plates.

[0009] Furthermore, the locking component includes screw holes formed on the first ear plate and the second ear plate, and the screw holes on the correspondingly stacked first ear plate and the second ear plate are connected; it also includes a bolt assembly, which is installed in the screw hole that is connected to the first ear plate and the second ear plate.

[0010] Furthermore, the horizontal plate and the mounting plate are overlapped accordingly, and the horizontal plate and the mounting plate are provided with communicating screw holes, in which bolt assemblies are installed.

[0011] Furthermore, one end of the connecting beam overlaps with the vertical plate, and the connecting beam end and the vertical plate are provided with a threaded hole that communicates with each other, and a bolt assembly is installed in the threaded hole.

[0012] Furthermore, the bolt assembly includes a bolt, a washer, and a nut, with the washer and nut sequentially installed at the end of the bolt.

[0013] Furthermore, the end where the horizontal plate connects to the mounting plate is arc-shaped.

[0014] Furthermore, two reinforcing plates are vertically connected to the side of the mounting plate away from the horizontal plate, and both the mounting plate and the two reinforcing plates are vertically connected to the fixing mechanism.

[0015] Furthermore, the mounting plate and the two reinforcing plates are all perpendicularly connected to the outer side of the first U-shaped plate or the second U-shaped plate. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a structural schematic diagram of a modular assembled axial rigid connection tooling suitable for ladder cages according to an embodiment of this utility model; Figure 2 yes Figure 1 Side view of a modular, assembled, axially rigid connection fixture suitable for ladder cages; Figure 3 yes Figure 1 A top view of a modular, assembled, axially rigid connection fixture suitable for ladder cages.

[0018] In the diagram: 100, first enclosure panel; 101, first U-shaped panel; 102, first ear plate; 200, second enclosure panel; 201, second U-shaped panel; 202, second ear plate; 300, mounting plate; 301, reinforcing plate; 400, support plate; 401, horizontal plate; 402, vertical plate; 500, connecting beam. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0024] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0025] Please see Figure 1-3 This utility model provides a modular assembled axial rigid connection tooling suitable for ladder cages, including a fixing mechanism for connecting to the ladder cage, on which an mounting plate 300 is connected; it also includes a support plate 400, which includes a horizontal plate 401 and a vertical plate 402 vertically mounted on the horizontal plate 401, the horizontal plate 401 being rotatably connected to the mounting plate 300; and it also includes a connecting beam 500, one end of which is rotatably connected to the vertical plate 402, and the other end being detachably connected to the building.

[0026] In this embodiment, when in use, the connecting fixture is used to connect the axial square steel of the ladder cage to the building. The fixing mechanism is fixedly installed on the axial square steel, and the other end of the connecting beam 500 is fixedly connected to the pier (building), thereby stably positioning the ladder cage.

[0027] This utility model's modular prefabricated axial rigid connection fixture features a rotatable connection between the horizontal plate 401 on the support plate 400 and the mounting plate 300, as well as between the vertical plate 402 and one end of the connecting beam 500. This allows the connecting beam 500 to be adjusted at any angle in both the horizontal and vertical directions, satisfying adjustment in any direction. The other end of the connecting beam 500 can reach any position, thus enabling flexible connection with the building. Specifically, when the distance between the ladder cage and the building is different, adjusting the angle of the connecting beam 500 allows the other end of the connecting beam 500 to reach the building for anchoring. Therefore, it can adapt to buildings with different cross-sectional dimensions and inclination angles, solving the problem that traditional fixed connections are limited to main nodes and cannot be flexibly adjusted. Furthermore, the fixture adopts a modular design, facilitating prefabrication, transportation, and assembly, and is easy to load and unload, improving construction efficiency and safety.

[0028] Based on this, it can be determined that the connecting tooling is suitable for rigid connections with variable cross-section, large axial angle rotation, modular design, assembly, integration, and efficient installation and disassembly. It can be applied to high-altitude operation environments such as bridge engineering, subway and deep foundation pit construction, building construction and water conservancy and hydropower projects, tunnel entrance construction, and industrial and storage sites.

[0029] Optionally, the fixing mechanism includes a first enclosure 100 and a second enclosure 200 with identical structures. The first enclosure 100 and the second enclosure 200 are combined to form an enclosure structure for installation on the axial square steel of the ladder cage. The enclosure structure is equipped with a locking component for detachably connecting the first enclosure 100 and the second enclosure 200 to form the enclosure structure.

[0030] In this embodiment, the enclosure shape of the enclosure structure is the same as the cross-sectional shape of the axial square steel to ensure that the enclosure structure can be fixed around the axial square steel.

[0031] Specifically, by designing the fixing mechanism as two symmetrical parts, the first enclosure 100 and the second enclosure 200, and merging them into an enclosure structure using locking components, a quick clamp-type installation of the axial square steel of the ladder cage is achieved. Moreover, this structure is easy to disassemble and reuse, which can reduce welding operations, reduce construction difficulty and material waste, and enhance the adaptability and turnover of the tooling.

[0032] Optionally, the first enclosure 100 includes a first U-shaped plate 101 and two first ear plates 102 respectively vertically connected to the outer sides of both ends of the first U-shaped plate 101; the second enclosure 200 includes a second U-shaped plate 201 and two second ear plates 202 respectively vertically connected to the outer sides of both ends of the second U-shaped plate 201; the two first ear plates 102 are respectively overlapped with the two second ear plates 202, so that the first enclosure 100 and the second enclosure 200 are combined to form an enclosure structure; the locking component is provided on the correspondingly overlapped first ear plates 102 and second ear plates 202.

[0033] In this embodiment, taking the first enclosure plate 100 as an example, its overall structure is symmetrical. When the two first ear plates 102 are respectively stacked with the two second ear plates 202, the first U-shaped plate 101 and the second U-shaped plate 201 form an enclosure structure with the same enclosure shape as the cross-sectional shape of the axial square steel. The corresponding stacked first ear plates 102 and second ear plates 202 can be connected or disassembled by locking components, thereby realizing the merging and splitting of the enclosure structure, so that the first enclosure plate 100 and the second enclosure plate 200 can be conveniently and quickly loaded and unloaded onto the axial square steel.

[0034] Specifically, both the first enclosure 100 and the second enclosure 200 adopt a U-shaped plate plus ear plate structure design, which allows them to fit tightly against the axial square steel of the ladder cage when enclosed, thereby improving the contact area and connection stability.

[0035] Optionally, the locking component includes screw holes formed on the first ear plate 102 and the second ear plate 202, and the screw holes on the correspondingly stacked first ear plate 102 and the second ear plate 202 are connected; it also includes a bolt assembly, which is installed in the screw holes that are connected to the first ear plate 102 and the second ear plate 202.

[0036] In this embodiment, both the first ear plate 102 and the second ear plate 202 have two screw holes. That is, each pair of correspondingly stacked first ear plates 102 and second ear plates 202 have two interconnected screw holes, and bolt assemblies are installed in both interconnected screw holes.

[0037] Specifically, the locking component uses a combination of screw holes and bolt assemblies to achieve a reliable mechanical connection between the first enclosure 100 and the second enclosure 200; the bolt connection facilitates the application and control of preload, ensures the clamp is tight, avoids loosening due to vibration or load changes, and improves the stability and safety of the overall structure.

[0038] Optionally, the horizontal plate 401 and the mounting plate 300 are stacked correspondingly, and the horizontal plate 401 and the mounting plate 300 are provided with communicating screw holes, in which bolt assemblies are installed.

[0039] In this embodiment, the horizontal plate 401 can rotate around the center of the screw hole, thereby adjusting the angle between the horizontal plate 401 and the vertical plate 402 in the horizontal direction, and thus adjusting the angle of the connecting beam 500 in the horizontal direction.

[0040] Specifically, the horizontal plate 401 and the mounting plate 300 are rotatably connected by screw holes and bolt assemblies, allowing the support plate 400 to be adjusted in angle in the horizontal plane to adapt to the alignment requirements of the ladder cage and the pier in different directions. This design enhances the flexibility and adaptability of the tooling and is suitable for construction sites with complex spatial layouts.

[0041] Optionally, one end of the connecting beam 500 overlaps with the vertical plate 402, and the connecting beam 500 and the vertical plate 402 are provided with communicating screw holes, in which bolt assemblies are installed.

[0042] In this embodiment, this end of the connecting beam 500 can rotate around the center of the screw hole, thereby adjusting the angle of the connecting beam 500 in the vertical direction.

[0043] Specifically, the connecting beam 500 and the vertical plate 402 are also connected by rotatable bolts, which allows the connecting beam 500 to adjust its angle in the vertical plane, further expanding the tooling's spatial adjustment capability; this structure allows the tooling to adapt to piers with large-angle inclination or rotation, improving its applicability in variable cross-section structures.

[0044] Optionally, the bolt assembly includes a bolt, a washer, and a nut, with the washer and nut sequentially installed at the end of the bolt.

[0045] Specifically, the bolt assembly uniformly adopts a combination of bolts, washers, and nuts, with a high degree of structural standardization, facilitating procurement, inspection, and construction. The use of washers can distribute the pressure between the bolt head and the plate, prevent local deformation, and improve the durability and anti-loosening ability of the connection.

[0046] Optionally, the end of the horizontal plate 401 that connects to the mounting plate 300 is arc-shaped.

[0047] Specifically, the end of the horizontal plate 401 connected to the mounting plate 300 is designed as an arc, which can avoid structural interference during rotation, achieve smoother large-angle rotation, and is suitable for working conditions where angles need to be frequently adjusted or where the installation space is narrow, thus enhancing the practicality and ease of operation of the tooling.

[0048] Optionally, two reinforcing plates 301 are vertically connected to the side of the mounting plate 300 away from the horizontal plate 401, and both the mounting plate 300 and the two reinforcing plates 301 are vertically connected to the fixing mechanism.

[0049] Specifically, two reinforcing plates 301 are provided on the back of the mounting plate 300 to form a T-shaped reinforcing structure, which significantly improves the bending and shear resistance at the connection between the mounting plate 300 and the fixing mechanism. The reinforcing plates 301 and the horizontal plate 401 are connected as a whole by welding. At the same time, the mounting plate 300 and the two reinforcing plates 301 are also fixedly connected to the fixing mechanism by welding. This design effectively disperses the load, prevents plate deformation or weld cracking caused by stress concentration, and improves the overall rigidity and service life.

[0050] Optionally, the mounting plate 300 and the two reinforcing plates 301 are both vertically connected to the outer side of the first U-shaped plate 101 or the second U-shaped plate 201.

[0051] In this embodiment, the mounting plate 300 and the two reinforcing plates 301 are all welded perpendicularly to the outer side of the second U-shaped plate 201.

[0052] Specifically, the mounting plate 300 and the reinforcing plate 301 are both vertically connected to the outside of the second U-shaped plate 201, avoiding conflict with the internal space of the enclosure and facilitating the installation and disassembly of the axial square steel of the cage; at the same time, the external connection also facilitates welding or bolt fixing, making construction operations more convenient, while maintaining the neatness and aesthetics of the structure.

[0053] The construction steps for the modular assembled axial rigid connection fixture applicable to ladder cages in this embodiment are as follows: Step 1: Structural stability calculation: To save materials and simplify construction, No. 10 channel steel, 20mm steel plates, and high-strength bolts were selected as the materials for this fixture, which was then fixed using high-strength bolts and gas-shielded welding. The dimensions of the fixture were designed using calculation software to ensure the stability of the structure; after continuous adjustments, the final structural form of this embodiment was determined, and calculations showed that the stability of this structural form meets the construction requirements.

[0054] Step 2: Prefabrication of modular assembled axial rigid connection fixtures: The tooling is made of No. 10 channel steel, 20mm steel plate and high-strength bolts. The materials are cut and assembled in the leveled area. During the welding process, the weld is made full and the weld quality is inspected. The torque force of the high-strength bolt connection needs to be tested. The weld quality and torque force are reported by a third-party testing unit, and the safety factor of the structure is guaranteed.

[0055] Step 3: Installation of modular prefabricated axial rigid connection fixtures: 1. The clamp contact surfaces of the first enclosure plate 100 and the second enclosure plate 200 (the overlapping surfaces of the first ear plate 102 and the second ear plate 202) are bolted together by high-strength bolts, washers and nuts. The debris inside the mating groove (the inner side of the enclosure structure, i.e. the side in contact with the axial square steel) is cleaned and bolted to the axial square steel (column) of the ladder cage to form an integral load-bearing clamp member.

[0056] 2. Weld the outer sides of the second U-shaped plate 201 in the mounting plate 300 and the second enclosure plate 200 together to form a whole.

[0057] 3. Overlap the horizontal plate 401 of the support plate 400 with the mounting plate 300, clean the debris in the overlapping surface, and bolt them together with high-strength bolts, washers and nuts to form a whole; 4. Overlap the vertical plate 402 of the connecting beam 500 and the support plate 400, clean the debris in the overlapping surface, and connect component three and component five into one piece by high-strength bolts and washers, and connect them into one piece by high-strength bolts, washers and nuts. 5. Based on the position of the pier, adjust the horizontal plate 401 and the connecting beam 500 in the horizontal and vertical directions respectively until the anchor point of the other end of the connecting beam 500 matches the positioning point on the pier, then fix the connecting beam 500 on the pier.

[0058] Step 4: Safety Condition Verification and Confirmation Staff conducted a safety inspection to ensure the safety of the ladder cage connection.

[0059] Step 5: Dismantling of the modular assembly axial rigid connection fixture: 1. Workers use aerial work platforms for demolition work, with safety belts attached high and secured to the platform; the platform is marked with a warning zone and safety warning signs. 2. Use an electric handle and a manual wrench to remove both ends of component five from the pier and vertical plate 402 respectively; 3. Remove the bolts connecting the first enclosure panel 100 and the second enclosure panel 200; 4. After dismantling, conduct a safety check on all components of the tooling to prevent deformation during the next use, which could lead to safety hazards such as insufficient stress resistance.

[0060] 5. Return it to the warehouse, where dedicated personnel will carry out maintenance and repair work, in preparation for the next use.

[0061] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A modular, assembled, axially rigid connection fixture suitable for ladder cages, characterized in that, It includes a fixing mechanism for connecting to the ladder cage, on which a mounting plate (300) is connected; it also includes a support plate (400), which includes a horizontal plate (401) and a vertical plate (402) vertically mounted on the horizontal plate (401), the horizontal plate (401) being rotatably connected to the mounting plate (300); it also includes a connecting beam (500), one end of which is rotatably connected to the vertical plate (402), and the other end being detachably connected to the building.

2. The modular assembled axial rigid connection fixture for ladder cages according to claim 1, characterized in that, The fixing mechanism includes a first enclosure (100) and a second enclosure (200) with identical structures. The first enclosure (100) and the second enclosure (200) are combined to form an enclosure structure for installation on the axial square steel of the ladder cage. The enclosure structure is equipped with locking components to detachably connect the first enclosure (100) and the second enclosure (200) to form the enclosure structure.

3. The modular assembled axial rigid connection fixture for ladder cages according to claim 2, characterized in that, The first enclosure (100) includes a first U-shaped plate (101) and two first ear plates (102) respectively vertically connected to the outer sides of both ends of the first U-shaped plate (101); the second enclosure (200) includes a second U-shaped plate (201) and two second ear plates (202) respectively vertically connected to the outer sides of both ends of the second U-shaped plate (201); the two first ear plates (102) are respectively overlapped with the two second ear plates (202), so that the first enclosure (100) and the second enclosure (200) are combined to form an enclosure structure; the locking component is provided on the correspondingly overlapped first ear plates (102) and second ear plates (202).

4. The modular assembled axial rigid connection fixture for ladder cages according to claim 3, characterized in that, The locking component includes screw holes opened on the first ear plate (102) and the second ear plate (202), and the screw holes on the corresponding overlapping first ear plate (102) and the second ear plate (202) are connected; it also includes a bolt assembly, which is installed in the screw hole connected to the first ear plate (102) and the second ear plate (202).

5. The modular assembled axial rigid connection fixture for ladder cages according to claim 1, characterized in that, The horizontal plate (401) and the mounting plate (300) are stacked correspondingly, and the horizontal plate (401) and the mounting plate (300) are provided with communicating screw holes, and bolt assemblies are installed in the communicating screw holes.

6. The modular assembled axial rigid connection fixture for ladder cages according to claim 1, characterized in that, One end of the connecting beam (500) overlaps with the vertical plate (402), and the connecting beam (500) and the vertical plate (402) have a threaded hole that communicates with each other, and a bolt assembly is installed in the threaded hole.

7. The modular assembled axial rigid connection tooling for ladder cages according to claim 4, 5 or 6, characterized in that, The bolt assembly includes a bolt, a washer, and a nut, with the washer and nut sequentially installed at the end of the bolt.

8. The modular assembled axial rigid connection tooling suitable for ladder cages according to claim 1, characterized in that, The end where the horizontal plate (401) connects to the mounting plate (300) is arc-shaped.

9. The modular assembled axial rigid connection fixture for ladder cages according to claim 3, characterized in that, The mounting plate (300) is vertically connected to two reinforcing plates (301) on the side away from the horizontal plate (401), and both the mounting plate (300) and the two reinforcing plates (301) are vertically connected to the fixing mechanism.

10. The modular assembled axial rigid connection fixture for ladder cages according to claim 9, characterized in that, The mounting plate (300) and the two reinforcing plates (301) are both vertically connected to the outer side of the first U-shaped plate (101) or the second U-shaped plate (201).

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