Maintenance device for long-span bridge railings with folding ladders and protective fences

Abstract

This utility model relates to the field of construction safety technology and discloses a maintenance device for a large-span bridge railing with a folding ladder and protective railing. The device includes a ladder, a folding hanging ladder, a protective cage, and a support assembly. The folding hanging ladder is installed at the top of the ladder and can be folded to fit the ladder when not in use, reducing its size. When in use, it is unfolded to support the railing, providing stable transition support for climbing. The protective cage is fixed to the side of the ladder with bolts, forming a ring-shaped protective structure to prevent falls. The support assembly contains multiple evenly arranged support platforms, which are automatically retracted via connecting rollers, assembly cylinders, and coil springs. Normally, the coil springs keep the support platforms close to the ladder; when in use, stepping on a support platform overcomes the spring force to unfold it, and a limiting platform prevents excessive flipping, ensuring stable support and providing a place for maintenance personnel to stop and operate. All components are foldable and detachable, saving manpower and resources for transportation. Installation only requires unfolding and fixing; it occupies little space when not in use and can be flexibly transferred to different bridges, adapting to the maintenance needs of multi-span bridges. This improves convenience and safety.

Description

Technical Field

[0001] This utility model relates to the field of construction safety technology, and in particular to a maintenance device for a long-span bridge railing with a folding ladder and a protective fence. Background Technology

[0002] Long-span bridges (such as cable-stayed bridges and suspension bridges) are core facilities of transportation hubs. Their guardrails not only guide traffic flow and prevent vehicles from falling off the bridge, but also need to resist external forces such as wind and rain erosion and vehicle impacts. Therefore, regular structural inspections, anti-corrosion maintenance, and damage repairs are necessary to ensure the safe operation of the bridge.

[0003] The current maintenance of guardrails for long-span bridges mainly relies on two types of devices: one is a fixed maintenance platform, whose ladder and guardrail are an integrated rigid structure. Although it has strong stability, since the length of guardrails for long-span bridges is usually tens to hundreds of meters, the fixed device needs to be transported in sections and spliced ​​on site. This not only results in high transportation costs and time-consuming installation, but also occupies a lot of storage space when idle, making it difficult to meet the mobile maintenance needs of multi-span bridges. The other type is a temporary erection device, such as using scaffolding to splice ladders and attaching simple guardrails. Although this type of device is low in cost, the ladders do not have a folding and storage structure, the overall size after assembly is large, and it is inconvenient to move. In addition, the guardrails are mostly spliced ​​from single steel pipes without anti-fall buckles or side guard plates. When maintenance personnel move at heights, they are prone to safety risks due to the large gaps in the guardrails. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the existing technology has the disadvantage of high transportation cost of the device. To this end, we propose a maintenance device for large-span bridge railings with foldable ladder and protective fence.

[0005] To achieve the above objectives, this application adopts the following technical solution: a maintenance device for a large-span bridge railing with a folding ladder and a protective fence, comprising a ladder, wherein a receiving component is provided on the surface of the ladder, the receiving component includes multiple receiving platforms, the receiving platforms are disposed on the surface of the ladder, a connecting roller is fixedly connected to the bottom of the receiving platform, an assembly cylinder is sleeved on the surface of the connecting roller, coil springs are sleeved at both ends of the connecting roller, the coil springs are placed inside the assembly cylinder, and a limiting platform is provided on the bottom of the receiving platform near the ladder, one side of the limiting platform is fixedly connected to the ladder.

[0006] Preferably, a folding hanging ladder is installed at the top of the ladder.

[0007] Preferably, the side of the ladder away from the folding ladder is fixed with a protective cage by bolts.

[0008] Preferably, the plurality of receiving platforms are evenly arranged along the length of the ladder.

[0009] Preferably, the surface of the assembly cylinder has a communicating window.

[0010] Preferably, the side of the receiving platform away from the connecting roller extends from the communicating window to the ladder surface.

[0011] Preferably, the coil springs at both ends are symmetrically distributed along the axis of the connecting roller.

[0012] Preferably, one end of the coil spring is fixedly connected to the inner wall of the assembly cylinder, and the other end of the coil spring is fixedly connected to the connecting roller.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] This utility model relates to a large-span bridge railing maintenance device. A ladder serves as the core support, complemented by a folding ladder, a protective cage, and a support assembly. The folding ladder is mounted on top of the ladder; when not in use, it folds to fit snugly against the ladder, reducing its size. When in use, it unfolds to support the railing, providing stable transition support for climbing. The protective cage is bolted to the side of the ladder, forming a ring-shaped protective barrier against falls. It can be easily disassembled by removing the bolts, simplifying storage. The support assembly contains multiple evenly arranged support platforms, which are automatically retracted via connecting rollers, an assembly cylinder, and a coil spring. Normally, the coil spring keeps the support platforms close to the ladder; when in use, stepping on a support platform overcomes the spring force to unfold it, while a limiting platform prevents excessive tilting, ensuring stable support and providing a place for maintenance personnel to stop and operate.

[0015] The device eliminates the need for segmented transportation and complex assembly: each component is foldable and detachable, saving manpower and resources during transportation; installation only requires unfolding and securing; it occupies little space when not in use and can be flexibly transferred to different bridges, adapting to the maintenance needs of multi-span bridges. Compared to temporary installations, its advantages are more obvious: its compact size after storage makes it easy to move, eliminating the need for large equipment; the integrated protective cage avoids gap issues; the spring-loaded support platform automatically resets; and the limiting platform ensures stability, significantly improving convenience and safety, providing reliable protection for high-altitude maintenance. Attached Figure Description

[0016] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the overall exploded structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the receiving component and ladder assembly structure of this utility model;

[0020] Figure 4This is a schematic diagram of the receiving component structure of this utility model;

[0021] Figure 5 This is an exploded structural diagram of the receiving component of this utility model.

[0022] Legend: 1. Ladder; 2. Folding ladder; 3. Protective cage; 4. Receiving component; 401. Receiving platform; 402. Connecting roller; 403. Assembly cylinder; 404. Connecting window; 405. Coil spring; 406. Limiting platform. Detailed Implementation

[0023] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0024] Reference Figures 1 to 5 As shown, this utility model provides a technical solution: a maintenance device for a large-span bridge railing with a folding ladder and a protective fence. The device includes a ladder 1, a folding ladder 2 installed at the top of the ladder 1, and a protective cage 3 bolted to the side of the ladder 1 away from the folding ladder 2. A support component 4 is provided on the surface of the ladder 1. The maintenance device uses the ladder 1 as its core support structure, and all components are arranged around the ladder 1 to achieve functional coordination and storage adaptation. The folding ladder 2 at the top of the ladder 1 is a key component connecting the bridge railing. When not in use, it can be folded up along the top of the ladder 1, tightly fitting the main body of the ladder 1 to reduce the overall volume. When in use, it can be unfolded outwards and placed against a suitable position on the bridge railing, providing maintenance personnel with transitional support for climbing from the ground to the top of the railing, ensuring the stability of the starting point. A protective cage 3 is bolted to the side of the ladder 1 away from the folding ladder 2. The protective cage 3 can be used simultaneously with the ladder 1 to form a ring-shaped protective space around the ladder 1, preventing maintenance personnel from falling from the side of the ladder 1 during the climbing process. When it is necessary to store it, the fixing bolts can be loosened to separate the protective cage 3 from the ladder 1 for separate storage, reducing the overall storage difficulty.

[0025] The receiving component 4 includes multiple receiving platforms 401, which are disposed on the surface of the ladder 1. The multiple receiving platforms 401 are evenly arranged along the length of the ladder 1. A connecting roller 402 is fixedly connected to the bottom of the receiving platform 401. An assembly cylinder 403 is sleeved on the surface of the connecting roller 402. A communicating window 404 is opened on the surface of the assembly cylinder 403. The side of the receiving platform 401 away from the connecting roller 402 protrudes from the communicating window 404 to the surface of the ladder 1. Coil springs 405 are sleeved at both ends of the connecting roller 402. The coil springs 405 are symmetrically distributed along the axis of the connecting roller 402. The coil springs 405 are placed inside the assembly cylinder 403. One end of the coil spring 405 is fixedly connected to the inner wall of the assembly cylinder 403, and the other end of the coil spring 405 is fixedly connected to the connecting roller 402. A limiting platform 406 is provided on the bottom side of the receiving platform 401 near the ladder 1. One side of the limiting platform 406 is fixedly connected to the ladder 1. As the core load-bearing structure of the device, the receiving component 4 relies on the ingenious coordination of mechanical structures to achieve automatic storage and stable support. The receiving platform 401 is movably connected to the assembly cylinder 403 via the connecting roller 402 at the bottom. The assembly cylinder 403 is fixed to the surface of the ladder 1, and the connecting window 404 provides a space channel for the extension and retraction of the receiving platform 401. In normal operation, the coil spring 405 inside the assembly cylinder 403 is in a naturally charged state. One end of the coil spring 405 is fixed to the inner wall of the assembly cylinder 403, and the other end is connected to the connecting roller 402. Its elasticity will drive the connecting roller 402 to rotate along its own axis, thereby causing the receiving platform 401 to rotate around the connecting roller 402 towards the ladder 1. Finally, the side of the receiving platform 401 away from the connecting roller 402 will retract to a state close to the surface of the ladder 1, achieving automatic storage and avoiding the occupation of extra space when not in use. When maintenance personnel need to use the receiving platform 401, they only need to step on the protruding part of the receiving platform 401. The external force will overcome the elasticity of the coil spring 405, causing the receiving platform 401 to rotate around the connecting roller 402 in a direction away from the ladder 1 until it reaches a suitable support angle for stepping. At this time, the limiting platform 406 fixed on the ladder 1 will contact the bottom of the receiving platform 401 on the side close to the ladder 1, preventing the receiving platform 401 from continuing to rotate, ensuring that the receiving platform 401 maintains a stable support posture, providing a safe stepping platform for maintenance personnel, and facilitating their stay or operation on the ladder 1.

[0026] This device effectively solves many drawbacks of existing fixed maintenance platforms. Existing fixed devices, due to the integrated rigid structure of the ladder 1 and protective fence, require segmented transportation and on-site assembly when dealing with large-span bridge railings. In contrast, this device's ladder 1, folding ladder 2, protective cage 3, and supporting components 4 all have storage capabilities. During transportation, each component can be folded or disassembled and loaded together, eliminating the need for segmented transportation and significantly reducing manpower and material costs. Installation requires no complex on-site assembly procedures; simply unfold or fix each component for immediate use, saving considerable installation time. When not in use, each component can be folded or disassembled for storage, occupying only a small amount of storage space, and can be flexibly transferred to different bridges for maintenance, fully adapting to the mobile maintenance needs of multi-span bridges.

[0027] Compared to temporary installations, this device offers significant improvements in both convenience and safety. Temporary installations often use scaffolding to construct ladders 1, which, lacking a folding structure, result in a bulky overall size after assembly, making them difficult to transport. In contrast, this device's ladder 1, equipped with a foldable hanging ladder, significantly reduces the overall size when folded, making transport much easier and less strenuous, eliminating the need for large transport equipment. Regarding protection, temporary installations often use single steel pipes for their protective railings, resulting in excessive gaps and a lack of fall arrestors or side guards, increasing the risk of falls for maintenance personnel moving at heights. This device's protective cage 3, however, is an integrated protective structure that provides comprehensive protection for the sides of ladder 1, effectively avoiding the problem of excessive gaps. Furthermore, the automatic reset function of the coil spring 405 in the receiving component 4 eliminates the need for manual folding of the receiving platform 401; it can be easily unfolded upon use. The addition of the limiting platform 406 ensures the stability of the receiving platform 401, further enhancing safety during maintenance and providing reliable protection for maintenance personnel working at heights.

[0028] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A maintenance device for long-span bridge railings with a folding ladder and protective fence, characterized in that: The device includes a ladder, the surface of which is provided with a receiving assembly, the receiving assembly including multiple receiving platforms, the receiving platforms being disposed on the surface of the ladder, the bottom of the receiving platform being fixedly connected to a connecting roller, the surface of the connecting roller being sleeved with an assembly cylinder, both ends of the connecting roller being sleeved with coil springs, the coil springs being placed inside the assembly cylinder, and the bottom of the receiving platform being provided with a limiting platform on the side near the ladder, one side of the limiting platform being fixedly connected to the ladder.

2. The bridge railing maintenance device with folding ladder and protective fence as described in claim 1, characterized in that: A folding hanging ladder is installed at the top of the ladder.

3. The bridge railing maintenance device with folding ladder and protective fence as described in claim 1, characterized in that: The side of the ladder away from the folding ladder is secured with a protective cage by bolts.

4. The bridge railing maintenance device with folding ladder and protective fence as described in claim 1, characterized in that: The multiple receiving platforms are evenly arranged along the length of the ladder.

5. The bridge railing maintenance device with folding ladder and protective fence according to claim 1, characterized in that: The surface of the assembly cylinder has a connecting window.

6. The bridge railing maintenance device with folding ladder and protective fence according to claim 1, characterized in that: The receiving platform extends from the connecting window onto the ladder surface on the side furthest from the connecting roller.

7. The bridge railing maintenance device with folding ladder and protective fence according to claim 1, characterized in that: The coil springs at both ends are symmetrically distributed along the axis of the connecting roller.

8. The bridge railing maintenance device with folding ladder and protective fence according to claim 1, characterized in that: One end of the coil spring is fixedly connected to the inner wall of the assembly cylinder, and the other end of the coil spring is fixedly connected to the connecting roller.

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