A ladder cage device for the top and bottom plate platform passage of a hanging basket

Abstract

A ladder cage device for a passageway on the top and bottom platform of a hanging basket includes a ladder cage installed above the base of the hanging basket platform. A lifting beam is installed on the top of the ladder cage for fixed connection to the top of the outer truss of the side formwork of the hanging basket via U-bolts. Multiple ladder cage connection attachment devices are installed at intervals on the ladder cage columns on both sides of the ladder cage for connection and fixation to the vertical members of the outer truss of the side formwork of the hanging basket. The top of the ladder cage in this ladder cage device for a passageway on the top and bottom platform of a hanging basket is connected and fixed to the outer truss of the hanging basket via the lifting beam. Several attachments are provided in the height direction to fix the passageway ladder cage to the outer truss of the hanging basket, constructing a stable spatial truss structure with extremely strong anti-overturning and anti-deformation capabilities. It can also move synchronously with the hanging basket, maintaining stability during the movement of the hanging basket and avoiding problems such as displacement and swaying caused by loose connections in existing passageways.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary devices for bridge construction, specifically a ladder cage device for the top and bottom plate platform passage of a hanging basket. Background Technology

[0002] Cantilever construction refers to a construction method in which working platforms are set up on both sides of the bridge pier, and cement concrete beams are poured segment by segment towards the mid-span cantilever in a balanced manner, with prestressing applied segment by segment. The formwork is the main equipment in cantilever construction, and can be divided into four types according to structural form: truss type, cable-stayed type, steel type, and hybrid type. Based on the requirements of concrete cantilever construction technology and design drawings for the formwork, this paper comprehensively compares the characteristics, weight, type of steel used, and construction technology of various types of formwork. The design principles for the formwork are: light weight, simple structure, sturdy and stable, easy to move forward and disassemble, strong reusability, small deformation under stress, and sufficient space under the formwork to provide a large working surface, which is beneficial for the construction of reinforcing steel and formwork.

[0003] In cantilever construction using hanging baskets, the top and bottom platforms are the core areas for workers to perform operations such as rebar tying, concrete pouring, and curing. Frequent back-and-forth movement between these two platforms is a critical aspect of the construction process. Because the hanging basket structure is a high-altitude suspended working platform, there is a height difference of 3-8 meters between the top and bottom platforms. Therefore, the safety, convenience, and stability of the access routes directly affect construction efficiency and personnel safety. The requirements for construction safety in bridge construction are becoming increasingly stringent. The "Technical Specifications for Safety in Highway Bridge and Culvert Construction" clearly stipulates that high-altitude operation passages must meet basic conditions such as anti-slip, anti-fall, and load-bearing capacity. Currently, the commonly used top and bottom slab access passage solutions in engineering are mostly temporary constructions or simple modifications, lacking targeted design. These mainly include steel pipe fastener ladders and folding steel ladders. The above-mentioned top and bottom slab access passage solutions have revealed many defects in practical applications: for example, temporary ladders are prone to swaying, uneven tread spacing leads to low passage efficiency; simple scaffold passages lack guardrails, posing a risk of falls; some passages are loosely connected to the hanging basket structure, which is prone to displacement during hanging basket movement or strong winds, causing safety hazards. Although the ladder cage has good protection and stability, the hanging basket platform base has a certain slope, and the hanging basket needs to be raised to different heights according to construction needs, making it unsuitable for the ladder cage to be directly supported and installed on the hanging basket. Therefore, it is necessary to develop a top and bottom slab platform access ladder cage device that is integrated with the hanging basket structure, has high safety, can be moved synchronously, and can adapt to complex working conditions. Summary of the Invention

[0004] The purpose of this utility model is to address the problems existing in the prior art by providing a ladder cage device for the top and bottom platform passage of a hanging basket. The top of the ladder cage of this ladder cage device is connected and fixed to the outer formwork truss of the hanging basket through a hanging beam. Several attachments are provided in the height direction to fix the ladder cage of the passage to the outer formwork truss, forming a stable spatial truss structure with strong anti-overturning and anti-deformation capabilities. It can also move synchronously with the hanging basket and remain stable during the movement of the hanging basket, avoiding the displacement and shaking problems caused by loose connections in existing passages.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A ladder cage device for a platform passageway on the top and bottom of a hanging basket includes a ladder cage installed above the base of the hanging basket platform. The top of the ladder cage is equipped with a lifting beam for fixed connection to the top of the outer truss of the side formwork of the hanging basket via U-bolts. Multiple ladder cage connecting attachment devices are installed at intervals on the ladder cage columns on both sides of the ladder cage for connecting and fixing to the vertical members of the outer truss of the side formwork. The bottom ends of the ladder cage columns are either in contact with or suspended from contact with the base of the hanging basket platform. This ladder cage device can move with the entire hanging basket after installation, exhibiting good coordination with the hanging basket. When the hanging basket platform is raised or lowered, only the bottom end of the ladder cage needs to be disassembled and reassembled, without reinstallation, further saving process connection time and shortening the construction cycle of a single span by 1-2 days. Ladder cages are a mature, existing product, and their structural components will not be elaborated upon again. The main features are a fully enclosed protective net around the cage, with fine mesh to effectively block falling objects and prevent accidental falls. Inside the cage are anti-slip treads with a special anti-slip textured surface, ensuring safe movement even in damp environments caused by concrete curing water. Furthermore, double-layered handrails of standard height are provided for easy gripping, further enhancing safety and significantly reducing construction safety risks. A further preferred embodiment: A suspension beam is installed on each of the left and right sides of the top of the ladder cage, and the suspension beams are respectively fixedly connected to the ladder cage columns at the front and rear ends of the ladder cage by bolts; each suspension beam includes a beam rod, with a connecting plate 1 vertically welded downwards at the rear end of the beam rod for bolt connection to the ladder cage column at the rear end of the ladder cage, and a connecting plate 2 vertically welded downwards at the front end of the beam rod for bolt connection to the ladder cage column at the front end of the ladder cage. Both connecting plates 1 and 2 have corresponding mounting holes for bolts. A saddle bolt connecting plate is welded to the top surface of the beam rod at the rear end of connecting plate 2 for installing saddle bolts. The suspension beams are erected on top of the outer truss of the side formwork of the hanging basket, and then saddle bolts are installed from bottom to top to lock the suspension beams and the outer truss of the side formwork of the hanging basket into a secure connection.

[0006] A further preferred embodiment: the beam is composed of two parallel channel steels, with a positioning plate welded between them. A second connecting plate is also welded between the two channel steels. The first connecting plate is reinforced to the two channel steels via a first stiffening plate, and the second connecting plate is reinforced to the two channel steels via a second stiffening plate. The positioning plate ensures that the distance between the two channel steels is greater than the cross-sectional dimensions of the ladder cage column, facilitating the erection of the hanging beam on top of the external truss of the hanging basket side formwork.

[0007] A further preferred embodiment: The ladder cage connection and attachment device includes a connecting strut, a fixed limiting plate, and a movable limiting plate. Both the fixed and movable limiting plates are respectively provided with two bolt mounting holes. Connecting bolts that connect the fixed and movable limiting plates are installed in the bolt mounting holes. The vertical members of the outer truss of the hanging basket side formwork are located within the space enclosed by the fixed limiting plate, the movable limiting plate, and the two connecting bolts. Nuts are installed on the connecting bolts. Tightening the nuts presses against the movable limiting plate, clamping the vertical members of the outer truss of the hanging basket side formwork. One end of the connecting strut is perpendicularly welded to the fixed limiting plate between the two bolt mounting holes. The connecting strut is provided with connecting holes for bolt connection with the ladder cage columns.

[0008] This ladder cage device, used for the access platform of the hanging basket top and bottom plate, uses a ladder cage as the main body for the upper and lower access between the top and bottom plates. The ladder cage can adopt a modular design, with each component connected by standardized connectors, eliminating the need for complex welding procedures. During installation, construction personnel can quickly complete assembly and disassembly according to the instructions, greatly saving manpower and time costs, and facilitating relocation to other construction sites. It is suitable for scenarios where hanging baskets are frequently moved and relocated. The ladder cage is equipped with a fully enclosed protective net with fine mesh, which can effectively block falling objects from heights and prevent personnel from falling accidentally. The ladder cage is equipped with anti-slip steps with a special anti-slip textured surface, ensuring personnel safety even in wet environments caused by concrete curing water. In addition, it is equipped with double-layer handrails that meet the height standard for easy gripping, further improving the safety factor and greatly reducing construction safety risks. The top of the ladder cage is connected and fixed to the outer formwork truss of the hanging basket via a hanging beam. Several attachments are installed in the height direction to fix the ladder cage to the outer formwork truss, forming a stable space truss structure with strong anti-overturning and anti-deformation capabilities. It can also move synchronously with the hanging basket and remain stable during the movement of the hanging basket, avoiding the displacement and shaking problems caused by loose connections in the existing passage. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the installation structure of the ladder cage device used for the platform passage of the top and bottom plate of the hanging basket; Figure 2 This is a structural schematic diagram of the suspension beam; Figure 3 yes Figure 2 A top-down view; Figure 4yes Figure 2 A left-view diagram; Figure 5 This is a schematic diagram of the structure of the ladder cage connection and attachment device; Figure 6 yes Figure 2 A top-down view; Figure 7 yes Figure 2 A left-view diagram; Figure 8 This is a schematic diagram of the ladder cage structure; Figure 9 This is a schematic diagram showing the installation relationship between the suspension beam and the ladder cage columns; Figure 10 This is a schematic diagram showing the installation relationship between the ladder cage connection attachment device and the ladder cage uprights; The names corresponding to the serial numbers in the figure are: 1. Hanging basket platform base; 2. Ladder cage; 3. Ladder cage connecting attachment device; 4. U-bolt; 5. Hanging beam; 6. Connecting plate one; 7. Stiffening plate one; 8. Beam rod; 9. Positioning plate; 10. U-bolt connecting plate; 11. Stiffening plate two; 12. Connecting plate two; 13. Mounting hole; 14. Connecting hole; 15. Connecting strut; 16. Fixed limit plate; 17. Connecting bolt; 18. Movable limit plate; 19. Nut; 20. Bolt mounting hole; 21. Ladder cage column; 22. Hanging basket side formwork outer truss. Detailed Implementation

[0010] To provide a more detailed description of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings. Example

[0011] A ladder cage device for a platform passageway on the top and bottom of a hanging basket includes a ladder cage 2, which is installed above the base 1 of the hanging basket platform. The top of the ladder cage 2 is equipped with a lifting beam 5 for fixed connection to the top of the outer truss 22 of the side formwork of the hanging basket via U-bolts 4. Multiple ladder cage connecting attachment devices 3 are installed at intervals on the ladder cage columns 21 on both sides of the ladder cage 2 for connecting and fixing to the vertical members of the outer truss 22 of the side formwork of the hanging basket. The bottom ends of the ladder cage columns 21 of the ladder cage 2 are either in contact with or suspended from contact with the base 1 of the hanging basket platform. This ladder cage device can move with the entire hanging basket after installation, exhibiting good coordination with the hanging basket. When the hanging basket platform is raised or lowered, only the bottom end of the ladder cage 2 needs to be disassembled and reassembled, without reinstallation, further saving process connection time and shortening the construction cycle of a single span by 1-2 days. Ladder cage 2 is an existing, mature product, and its structural components will not be described in detail again. The main features are a fully enclosed protective net around the cage, with fine mesh that can effectively block falling objects from heights and prevent personnel from falling accidentally. The cage is equipped with anti-slip treads with a special anti-slip textured surface, ensuring personnel safety even in wet environments caused by water used for concrete curing. In addition, it is equipped with double-layer handrails that meet the height standards for easy gripping, further improving the safety factor and greatly reducing construction safety risks. A suspension beam 5 is installed on each of the left and right sides of the top of the ladder cage 2. The suspension beam 5 is fixedly connected to the ladder cage columns 21 at the front and rear ends of the ladder cage 2 by bolts. The suspension beam 5 includes a beam rod 8. The rear end of the beam rod 8 is vertically welded with a connecting plate 6 for bolt connection to the ladder cage column 21 at the rear end of the ladder cage 2. The front end of the beam rod 8 is vertically welded with a connecting plate 12 for bolt connection to the ladder cage column 21 at the front end of the ladder cage 2. Both the connecting plate 6 and the connecting plate 12 are provided with mounting holes 13 for bolts. The top surface of the beam rod 8 at the rear end of the connecting plate 12 is welded with a saddle bolt connecting plate 10 for installing saddle bolts 4. The suspension beam 5 is erected on top of the outer truss 22 of the side formwork of the hanging basket, and then the saddle bolts 4 are installed from bottom to top to lock the suspension beam 5 and the outer truss 22 of the side formwork of the hanging basket.

[0012] The beam 8 is composed of two parallel channel steels, with a positioning plate 9 welded between them. A second connecting plate 12 is also welded between the two channel steels. The first connecting plate 6 is reinforced to the two channel steels via a first stiffening plate 7, and the second connecting plate 12 is reinforced to the two channel steels via a second stiffening plate 11. The positioning plate 9 ensures that the distance between the two channel steels is greater than the cross-sectional dimension of the ladder cage column 21, facilitating the erection of the hanging beam 5 on top of the outer truss 22 of the hanging basket side formwork.

[0013] The ladder cage connection attachment device 3 includes a connecting strut 15, a fixed limiting plate 16, and a movable limiting plate 18. The fixed limiting plate 16 and the movable limiting plate 18 are each provided with two bolt mounting holes 20. Connecting bolts 17 that connect the fixed limiting plate 16 and the movable limiting plate 18 are installed in the bolt mounting holes 20. The vertical members of the outer truss 22 of the hanging basket side formwork are located in the space enclosed by the fixed limiting plate 16, the movable limiting plate 18, and the two connecting bolts 17. Nuts 19 are installed on the connecting bolts 17. Tightening the nuts 19 presses against the movable limiting plate 18 to clamp the vertical members of the outer truss 22 of the hanging basket side formwork. One end of the connecting strut 15 is vertically welded to the fixed limiting plate 16 between the two bolt mounting holes 20. The connecting strut 15 is provided with connecting holes 14 for bolt connection with the ladder cage column 21.

[0014] Instructions for use of the ladder cage device for the platform passageway at the top and bottom of the hanging basket: Each component is individually fabricated in the factory beforehand. The specially designed prefabricated ladder cage, including its guardrails, steps, safety netting, and angle steel, is connected as a whole using bolts. The entire assembly is then hoisted using a tower crane. The top of the ladder cage is connected and fixed to the top of the outer truss of the hanging basket's side formwork using bolts to the lifting beam. To ensure the overall stability of the ladder cage, ladder cage connection and attachment devices are installed at intervals along the height direction to connect and fix the prefabricated ladder cage to the outer formwork truss, forming a stable system.

[0015] The above description is not intended to limit the present utility model, nor is the present utility model limited to the above examples. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should be protected by the present utility model.

Claims

1. A ladder cage device for a platform passageway on the top and bottom of a hanging basket, comprising a ladder cage (2), said ladder cage (2) being installed above the base (1) of the hanging basket platform, characterized in that: The top of the ladder cage (2) is equipped with a hanging beam (5) for fixed connection with the top of the hanging basket side formwork truss (22) by saddle bolts (4). The ladder cage columns (21) on both sides of the ladder cage (2) are respectively equipped with multiple ladder cage connection attachment devices (3) for connecting and fixing with the vertical rods of the hanging basket side formwork truss (22).

2. The ladder cage device for the platform passage of the hanging basket top and bottom plate according to claim 1, characterized in that: A lifting beam (5) is installed on the top left and right sides of the ladder cage (2). The lifting beam (5) is fixedly connected to the ladder cage column (21) at the front and rear ends of the ladder cage (2) by bolts. The lifting beam (5) includes a beam rod (8). The rear end of the beam rod (8) is vertically welded with a connecting plate 1 (6) for connecting with the ladder cage column (21) at the rear end of the ladder cage (2) by bolts. The front end of the beam rod (8) is vertically welded with a connecting plate 2 (12) for connecting with the ladder cage column (21) at the front end of the ladder cage (2) by bolts. The connecting plate 1 (6) and the connecting plate 2 (12) are respectively provided with mounting holes (13) for bolts. The top surface of the beam rod (8) at the rear end of the connecting plate 2 (12) is welded with a saddle bolt connecting plate (10) for installing saddle bolts (4).

3. The ladder cage device for the platform passage of the hanging basket top and bottom plate according to claim 2, characterized in that: The beam (8) is composed of two parallel channel steels. A positioning plate (9) is welded between the two channel steels. A connecting plate (12) is also welded between the two channel steels. The connecting plate (6) is reinforced to the two channel steels by stiffening plate (7). The connecting plate (12) is reinforced to the two channel steels by stiffening plate (11).

4. The ladder cage device for the platform passage of the hanging basket top and bottom plate according to claim 1, characterized in that: The ladder cage connecting attachment device (3) includes a connecting strut (15), a fixed limiting plate (16), and a movable limiting plate (18). The fixed limiting plate (16) and the movable limiting plate (18) are each provided with two bolt mounting holes (20). The bolt mounting holes (20) are equipped with connecting bolts (17) that connect the fixed limiting plate (16) and the movable limiting plate (18). The vertical rod of the outer truss (22) of the hanging basket side formwork is located at the fixed limiting plate (16) and the movable limiting plate (18). Within the space enclosed by the position plate (18) and two connecting bolts (17), nuts (19) are installed on the connecting bolts (17). Tightening the nuts (19) presses against the movable limiting plate (18) to clamp the vertical rod of the hanging basket side formwork truss (22). One end of the connecting strut (15) is vertically welded to the fixed limiting plate (16) between the two bolt mounting holes (20). The connecting strut (15) is provided with connecting holes (14) for bolt connection with the ladder cage column (21).

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