Safe crawling ladder for pipe jacking working well

Abstract

The utility model relates to a pipe jacking working well safety crawling ladder, which comprises a crawling ladder body and a hanging ladder, the hanging ladder is provided with a hooking part used for hooking on a pedal of the crawling ladder body, the hanging ladder is provided with a limiting hook and a limiting assembly used for limiting the rotation of the limiting hook in a running fit manner, the limiting hook is provided with a hook part, and the hook part can abut against the pedal of the crawling ladder body. The stable connection of the hanging ladder and the crawling ladder body is realized, and meanwhile, the connection reliability is further enhanced through the arrangement of the limiting hook and the limiting assembly. By means of the design, the problem that a traditional temporary crawling ladder is not stable in connection is solved, and the advantages of improving construction safety, enhancing stability of the crawling ladder, improving construction efficiency and reducing labor cost are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of building engineering especially is concerned with a pipe jacking working well safety ladder stand. BACKGROUND

[0002] In the construction process of the pipe jacking working well by the reverse construction method, the construction personnel need to reach the working well bottom operation area from the ground through the vertical ladder stand system. In the prior art, the ladder stand system is usually composed of a fixed ladder stand body and an external cage. However, due to the limitation of the reverse construction method layer-by-layer excavation process, there is often a height difference between the working well bottom construction surface and the bottom end of the ladder stand. To solve the problem of climbing interruption caused by the height difference, the current common method is to temporarily set up a movable ladder stand at the bottom of the fixed ladder stand for connection.

[0003] This temporary movable ladder stand scheme has the following significant defects: first, the temporary ladder stand usually adopts a simple welding or splicing structure, which lacks rigid connection with the fixed ladder stand and the well wall. Under the condition of personnel climbing with load or equipment vibration, the temporary ladder stand is prone to displacement or even overturning, which seriously threatens the safety of the construction personnel. Second, the temporary ladder stand usually does not have a cage or a falling prevention device, and there is a gap at the connection with the fixed ladder stand, which greatly increases the risk of personnel falling. Third, the length and position of the temporary ladder stand need to be adjusted every time the excavation depth at the well bottom changes, and the frequent disassembly and assembly not only prolongs the construction period, but also wastes labor costs, significantly reducing the construction efficiency.

[0004] In addition, the connection between the temporary ladder stand and the fixed ladder stand is often not firm enough, and may loosen or fall off during use, further increasing the safety hazard. At the same time, due to the fact that the material and structural strength of the temporary ladder stand are usually not as good as those of the fixed ladder stand, long-term use may cause the ladder stand to deform or be damaged, affecting its service life and safety performance.

[0005] On the other hand, the existing temporary ladder stand design lacks standardization and modularity, and different construction sites may adopt different temporary ladder stand schemes, which not only increases the management difficulty, but also is not conducive to the formation of uniform safety operation specifications for construction personnel. At the same time, the installation and disassembly process of the temporary ladder stand itself also has certain safety risks, especially in the narrow working well space, improper operation may cause personnel injury or equipment damage.

[0006] Considering the particularity of the pipe jacking working well construction environment, such as narrow space and slippery, the existing temporary ladder stand scheme does not fully consider the anti-skid and anti-corrosion aspects, which cannot meet the long-term use requirements. In addition, in emergency situations, the existing temporary ladder stand system lacks a quick evacuation design, which may affect the timely evacuation of construction personnel. SUMMARY

[0007] Therefore, the utility model provides a kind of top pipe working well safety ladder, improve the safety performance of top pipe working well climbing facility, optimize operation process, improve installation and disassembly efficiency, provide more reliable support for construction site.

[0008] The utility model provides a kind of top pipe working well safety ladder adopts following technical scheme:

[0009] A kind of top pipe working well safety ladder, including ladder body and hanging ladder, the hooking portion for being hooked in the pedal of ladder body is provided on the hanging ladder, the limiting hook and the limiting assembly for limiting the rotation of limiting hook are rotationally matched and arranged on the hanging ladder, the limiting hook has hook portion, the hook portion can be tightly closed to the pedal of ladder body.

[0010] Optionally, the hanging ladder is provided with a protrusion, and the protrusion is tightly closed to the pedal of the ladder body.

[0011] Optionally, the limiting assembly includes a driving rod, a pull rope and a sliding block, the driving rod and the limiting hook are coaxially connected by a connecting rod, the sliding block is slidingly matched and arranged on the hanging ladder, the pull rope is arranged between the driving rod and the sliding block, and the ladder is provided with a limiting piece for limiting the sliding of the sliding block.

[0012] Optionally, the limiting piece is a limiting rod, a limiting hole is formed in the hanging ladder, a connecting hole is formed in the sliding block, and the limiting rod penetrates the connecting hole and the limiting hole to limit the sliding of the connecting block.

[0013] Optionally, the longitudinal section of the hooking portion is close to C-shaped.

[0014] Optionally, the ladder body is provided with a protective cage.

[0015] In summary, the utility model includes at least one of the following beneficial technical effects: the stable connection of the hanging ladder and the ladder body is realized, and the setting of the limiting hook and the limiting assembly further enhances the reliability of the connection. This design solves the problem of unstable connection of traditional temporary ladder, has the advantages of improving construction safety, enhancing the stability of ladder, improving construction efficiency and reducing labor cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the overall structure of the utility model embodiment Figure One ;

[0017] Figure 2 is the overall structure of the utility model embodiment Figure Two .

[0018] Explanation of reference numerals in the attached drawings: 1. Ladder body; 2. Hanging ladder; 3. Hook; 4. Limit hook; 5. Protrusion; 6. Drive rod; 7. Pull rope; 8. Slider; 9. Limit rod; 10. Guard cage; 11. Limit hole; 12. Connecting rod. Detailed Implementation

[0019] The following is in conjunction with the appendix Figures 1-2 The present invention will be described in further detail below.

[0020] This utility model discloses a safety ladder for pipe jacking working shafts.

[0021] Reference Figure 1 and Figure 2 A safety ladder for pipe jacking shafts includes a ladder body 1 and a hanging ladder 2. The hanging ladder 2 is equipped with a hook portion 3 for hooking onto the footboard of the ladder body 1. A limit hook 4 and a limiting component for restricting the rotation of the limit hook are rotatably mounted on the hanging ladder 2. The limit hook 4 has a hook portion that can abut against the footboard of the ladder body 1. This achieves a stable connection between the hanging ladder 2 and the ladder body 1, while the limit hook 4 and the limiting component further enhance the reliability of the connection. This design solves the problem of unstable connections in traditional temporary ladders, and has the advantages of improving construction safety, enhancing ladder stability, increasing construction efficiency, and reducing labor costs.

[0022] The detachable connection design between the hanging ladder 2 and the ladder body 1 solves the problem of unstable connection between temporary and fixed ladders in existing technologies. The limiting hook 4 and limiting components on the hanging ladder 2 work together to provide additional fixed support after installation, effectively preventing displacement or detachment during use. Compared with existing technologies, this solution not only improves the overall stability of the ladder system but also simplifies the installation and disassembly process, reducing the operation time for construction workers. Specifically, when construction workers need to adjust the position of the hanging ladder 2, they only need to operate the limiting components to release the limiting hook 4, which quickly completes the repositioning of the hanging ladder 2, significantly improving construction efficiency.

[0023] The hanging ladder 2 is provided with a protrusion 5, which abuts against the step of the ladder body 1.

[0024] Specifically, the protrusion 5 can be integrally formed or set as a separate component. In this embodiment, it is integrally formed, and the protrusion 5 abuts against the pedal, forming a stable three-point support structure between the hanging ladder 2 and the climbing ladder body 1. Compared with the method of simply relying on the hook part 3 for connection, the protrusion 5 structure can effectively distribute the longitudinal load and prevent the hanging ladder 2 from swaying laterally when under force. At the same time, the contact friction between the protrusion 5 and the pedal can suppress the longitudinal slippage of the hanging ladder 2, maintaining the overall stability of the device during personnel climbing. This design solves the technical problem of easy displacement at the joint of temporary climbing ladder and fixed climbing ladder, and can achieve quick installation and positioning without additional fastening operations.

[0025] The ladder 2 is rotatably fitted with a limit hook 4 and a limit component for limiting the rotation of the limit hook. The limit component includes a drive rod 6, a pull rope 7 and a slider 8. The drive rod 6 and the limit hook 4 are coaxially connected by a connecting rod 12. The slider 8 is slidably fitted on the ladder 2. A pull rope 7 is provided between the drive rod 6 and the slider 8. The ladder is equipped with a limit component for limiting the sliding of the slider 8.

[0026] The drive rod 6 and the connecting rod 12 are rigidly connected. The connecting rod 12 passes through the rotation axis of the limiting hook 4, allowing the rotational motion of the drive rod 6 to be synchronously transmitted to the limiting hook 4. The pull rope 7 can be made of steel wire rope or high-strength nylon rope, with one end fixed to the eccentric position of the drive rod 6 and the other end connected to the top of the slider 8. The slider 8 is slidably connected to the hanging ladder 2, and its sliding direction is parallel to the length direction of the hanging ladder 2.

[0027] The limiting rod 9 serves as a limiting component. The hanging ladder 2 has a limiting hole 11, and the slider 8 has a connecting hole. The limiting rod 9 passes through the connecting hole and the limiting hole 11 to limit the sliding of the slider 8.

[0028] The limiting rod 9 is a cylindrical metal rod, the diameter of which matches the inner diameter of the limiting hole 11 and the connecting hole. As a preferred embodiment, the surface of the limiting rod 9 can be provided with anti-slip texture to enhance the fixing effect. The limiting hole 11 can be set on the side plate of the hanging ladder 2, its position corresponding to the extreme position of the sliding stroke of the slider 8. The connecting hole penetrates through the body of the slider 8, and its axis coincides with the axis of the limiting hole 11 when the slider 8 slides to the limiting position. The limiting rod 9 can be installed using a pin-type or threaded fastening method, with the pin-type facilitating quick assembly and disassembly, while the threaded fastening method provides a more stable locking effect.

[0029] Precise control of the movement of slider 8 is achieved through a mechanical limiting structure. When the limiting rod 9 is inserted into the connecting hole and the limiting hole 11, the sliding stroke of slider 8 is physically limited, thereby ensuring that the drive rod 6 and the limiting hook 4 remain in the predetermined position. Compared with the use of elastic elements or friction braking in the prior art, this rigid limiting structure has higher reliability and stability, and can effectively prevent accidental displacement under vibration or impact loads. At the same time, the insertion and removal operation of the limiting rod 9 is simple, allowing construction personnel to quickly adjust the limiting state according to the actual working conditions, thus improving construction efficiency.

[0030] The longitudinal section of the hook part 3 is approximately C-shaped. The C-shaped hook part 3 forms a wrap-around connection with the edge of the step of the ladder body 1 through its open side. The radius of curvature of the inner arc surface of the hook part 3 is slightly larger than the diameter of the step crossbar. Anti-slip textures can be provided on its inner arc surface to enhance the coefficient of friction. Furthermore, a 15-30° guide slope can be provided at the end of the hook part 3 to facilitate quick alignment with the step during installation.

[0031] The hook structure with a specific geometric shape enables rapid positioning and reliable connection between the hanging ladder 2 and the climbing ladder body 1. The C-shaped cross-section forms a mechanical self-locking mechanism in the vertical direction, effectively preventing lateral displacement or detachment of the hanging ladder 2 when personnel are climbing. Compared with traditional straight-plate hooks, this design significantly improves the stability of the temporary climbing ladder system while maintaining ease of disassembly, solving the connection reliability problem when frequently adjusting the climbing ladder in reverse construction methods.

[0032] A protective cage 10 is installed on the ladder body 1.

[0033] The cage 10 adopts a ring-shaped metal frame structure and is fixed to the uprights on both sides of the ladder body 1 by welding or bolting. In specific implementation, the longitudinal spacing of the guardrails of the cage 10 is no more than 150mm, and at least three ring-shaped reinforcing hoops are set in the transverse direction. The top extends to 1.2m above the uppermost step of the ladder body 1.

[0034] By incorporating a safety cage 10 into the ladder body 1, the risk of falls from heights for construction workers is effectively mitigated. When personnel climb, the safety cage 10 forms a surrounding protective space, preventing lateral falls due to instability during the climb. Compared to existing temporary ladders lacking protective devices, this structure provides continuous protection throughout the entire height, making it particularly suitable for deep foundation pit operations in pipe jacking shafts. The rigid connection between the safety cage 10 and the ladder body 1 ensures the stability of the overall structure, avoiding interruptions in safety protection caused by the disassembly and reassembly of temporary protective facilities.

[0035] In use, the limiting hook 4 at the upper end of the hanging ladder 2 is hooked onto the ladder body 1. The hook is angled during hooking. After hooking, the hanging ladder 2 is rotated downwards, causing the inclined surface at the front end of the limiting hook 4 to contact the step of the ladder body 1. This pushes the limiting hook 4 downwards, causing the limit hook 4 to rotate, which in turn drives the connecting rod 12 to rotate the drive rod 6. The drive rod 6 then lifts the pull rope 7 upwards, which in turn lifts the slider 8. At this time, the limiting rod 9 is not inserted. When the hanging ladder 2 and the ladder body 1... When fully engaged, the hook-shaped structure of the limiting hook 4, under the gravity of the slider 8, causes the limiting hook 4 to hook onto the ladder body 1. Then, the user inserts the limiting rod 9 horizontally into the limiting hole 11 to limit the limiting hook 4. The limiting hook 4, together with the hook part, limits the hanging ladder 2, thereby achieving installation. When not in use, the limiting rod 9 is pulled out, and the lower part of the hanging ladder 2 is pulled outward in the opposite direction to disengage the limiting hook 4. Then, the hanging ladder 2 is lifted upward to disengage the hook part, and the hanging ladder 2 can be disassembled.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A safety ladder for a pipe jacking working shaft, characterized in that: The system includes a ladder body and a hanging ladder. The hanging ladder is provided with a hook for hooking onto the footboard of the ladder body. The hanging ladder is rotatably equipped with a limit hook and a limit component for limiting the rotation of the limit hook. The limit hook has a hook portion that can abut against the footboard of the ladder body.

2. The safety ladder for pipe jacking working shaft according to claim 1, characterized in that: The ladder is provided with protrusions that abut against the steps of the ladder body.

3. The safety ladder for pipe jacking working shaft according to claim 2, characterized in that: The limiting component includes a drive rod, a pull rope, and a slider. The drive rod and the limiting hook are coaxially connected by a connecting rod. The slider is slidably fitted onto the ladder. A pull rope is provided between the drive rod and the slider. The ladder is provided with a limiting component to restrict the sliding of the slider.

4. The safety ladder for pipe jacking working shaft according to claim 3, characterized in that: The limiting component is a limiting rod. The hanging ladder has a limiting hole, and the slider has a connecting hole. The limiting rod passes through the connecting hole and the limiting hole to limit the sliding of the connecting block.

5. The safety ladder for pipe jacking working shaft according to claim 1, characterized in that: The longitudinal section of the hook is approximately C-shaped.

6. The safety ladder for pipe jacking working shaft according to claim 1, characterized in that: The ladder body is equipped with a protective cage.

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