Underground operation ladder

Abstract

The utility model relates to the technical field of borehole operation equipment, and discloses a borehole operation ladder, which is characterized by comprising an out-of-well support cross rod, an in-well ladder assembly and an operation platform, the outside-well supporting cross rod is used for being transversely erected on the top of the well mouth edge of a target operation well. The in-well ladder assembly comprises a top ladder and an extension ladder, the top ladder and the extension ladder respectively comprise a central ladder pipe and a plurality of groups of symmetrical step rods, and the plurality of groups of step rods are uniformly connected to the outer side of the central ladder pipe from top to bottom; connecting joints are arranged at the tops of the central ladder pipes of the top ladder; every two adjacent central ladder pipes are connected in a sleeving manner and are provided with connecting assemblies; the working platform comprises a transverse platform pedal, two side face connecting rods and two limiting hooks. The bottom ends of the two side face connecting rods are fixedly connected with the two sides of the transverse platform pedal respectively, the top ends of the two side face connecting rods are fixedly connected with one ends of the two limiting hooks respectively, and the two limiting hooks are used for being connected to a stepping rod in a hung mode.

Description

Technical Field

[0001] This utility model relates to the field of well-operated equipment technology, and more specifically, it relates to an underground working ladder. Background Technology

[0002] With the acceleration of urbanization and the increasing demand for water environment management, the construction and maintenance of drainage pipelines have become increasingly arduous. Maintenance personnel must use ladders to descend into the wells for work. Underground work provides a safe and efficient platform for workers to perform defect repairs, inspections, and the installation of various structures and equipment in inspection wells.

[0003] Currently, most people use ordinary wooden ladders, with the bottom of the ladder supported at the bottom of the well and the top leaning against the upper edge of the well. These ladders are not extendable, are bulky, inconvenient to carry, and are often too short for deep well operations, hindering maintenance work. Furthermore, they cannot be folded, taking up a lot of space and causing inconvenience in practical use. Utility Model Content

[0004] The purpose of this utility model is to provide an underground working ladder that is simple and convenient to install and disassemble, can be disassembled for transportation, occupies little space, and is more convenient to transport and use; it can be used for operations at different target depths and can be flexibly adjusted according to actual conditions.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an underground working ladder, including an external support crossbar, an internal ladder assembly, and a working platform;

[0006] The external support crossbar is used to rest horizontally on the top of the wellhead edge of the target working well;

[0007] The well ladder assembly includes a top ladder and at least one extension ladder that are sequentially nested from top to bottom. The top ladder and the extension ladder each include a central ladder tube and several sets of symmetrical steps. The sets of steps are evenly connected to the outside of the central ladder tube from top to bottom. The top of the central ladder tube of the top ladder is provided with a connecting joint for connecting to the external support crossbar. Adjacent central ladder tubes are nested together and provided with connecting components.

[0008] The working platform includes a horizontal platform step, two side connecting rods, and two limiting hooks; the bottom ends of the two side connecting rods are fixedly connected to both sides of the horizontal platform step, and the top ends of the two side connecting rods are fixedly connected to one end of the two limiting hooks, which are used to hang on the step bar.

[0009] As a preferred technical solution of this utility model, the external support crossbar is provided with an anti-rolling mechanism. The external support crossbar is a rod with a square cross-section. The anti-rolling mechanism includes several limiting crossbars and square pads. Several horizontal through holes are provided through the external support crossbar. The limiting crossbars pass through the through holes. The square pads are provided with through holes. Several square pads are respectively sleeved at both ends of the limiting crossbars.

[0010] As a preferred embodiment of this utility model, the top of the external support crossbar is fixedly equipped with a hanging lug, which is a semi-circular or hook-shaped hanging lug.

[0011] As a preferred embodiment of this utility model, the connecting joint includes a joint base plate, a joint front plate, a joint top plate, a movable rear pin plate, and a movable bolt. The bottom surface of the joint base plate is fixedly connected to the top end of the central ladder tube of the top ladder. The top and bottom ends of the joint front plate are respectively perpendicularly fixedly connected to the top end of the joint top plate and the front end of the joint base plate. The rear ends of the joint top plate and the joint base plate are provided with pin holes that match the movable rear pin plate. The bottom end of the movable rear pin plate passes through the two pin holes. The bottom end of the movable rear pin plate, which passes through the pin holes on the joint base plate, is provided with a pin hole. The top end of the central ladder tube of the top ladder is provided with a spiral groove corresponding to the pin hole. One end of the movable bolt passes through the pin hole and is screwed into the spiral groove. The cavity formed by the joint base plate, the joint front plate, the joint top plate, and the movable rear pin plate is used to pass through the external support crossbar.

[0012] As a preferred embodiment of this utility model, an expansion plate is provided at the top of the movable rear pin plate.

[0013] As a preferred technical solution of this utility model, the limiting hook includes a hook rear plate, a hook top plate, a hook front plate, and a hook bottom plate. The front and rear ends of the hook top plate are respectively fixedly connected to the top end of the hook front plate and the top end of the hook rear plate. The front side of the hook bottom plate is fixedly connected to the bottom end of the hook front plate, and the rear bottom surface of the hook bottom plate is fixedly connected to the side connecting rod.

[0014] As a preferred embodiment of this utility model, a transverse connecting rod is connected between the two side connecting rods, an inclined connecting rod is connected between the front side of the hook front plate and the front side of the transverse platform pedal, and a reinforcing connecting rod is connected between the connection part of the transverse platform pedal and the side connecting rod and the middle part of the inclined connecting rod.

[0015] As a preferred embodiment of this utility model, the end of the step bar away from the central ladder tube is inclined to the rear, and the top surface of the step bar is provided with anti-slip grooves.

[0016] As a preferred embodiment of this utility model, an anti-detachment limiting block is provided at the end of the step bar away from the central ladder tube, and the top of the anti-detachment limiting block is higher than the top of the step bar.

[0017] As a preferred embodiment of this utility model, the two ends of the central ladder tube of the extension ladder and the bottom end of the central ladder tube of the top ladder are respectively provided with two connecting pin holes distributed vertically, and the connecting component is a pin that matches the connecting pin holes.

[0018] In summary, the present invention has the following beneficial effects: the underground working ladder of the present invention is a multi-section split ladder body, which is simple and convenient to install and disassemble. It can be separated during transportation, occupies little space, and is more convenient to transport and use. It can be used for operations at different target depths and can be flexibly adjusted according to the actual situation. It has a high degree of flexibility in actual use and is more conducive to convenient use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the installation of the external support crossbar of this utility model;

[0021] Figure 3 This is a schematic diagram of the installation of the work platform of this utility model;

[0022] Figure 4 This is a schematic diagram of the connecting joint of this utility model;

[0023] Figure 5 This is a schematic diagram of the limiting hook structure of this utility model.

[0024] In the diagram: 1. External support crossbar; 2. Top ladder; 3. Extension ladder; 4. Central ladder tube; 5. Step bar; 6. Connecting joint; 7. Lateral platform tread; 8. Side connecting rod; 9. Limiting hook; 10. Limiting crossbar; 11. Square pad; 12. Hanging lug; 13. Joint base plate; 14. Joint front plate; 15. Joint top plate; 16. Movable rear pin plate; 17. Movable bolt; 18. Expansion plate; 19. Hook rear plate; 20. Hook top plate; 21. Hook front plate; 22. Hook base plate; 23. Lateral connecting rod; 24. Inclined connecting rod; 25. Reinforcing connecting rod; 26. Anti-detachment limiting block; 27. Connecting pin hole. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Therefore, the following detailed description of the embodiments of this utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0026] like Figure 1 As shown, this utility model provides an underground working ladder, including an external support crossbar 1, an internal ladder assembly, and a working platform;

[0027] External support crossbar 1 is used to be placed horizontally on top of the wellhead edge of the target working well;

[0028] The ladder assembly inside the well includes a top ladder 2 and at least one extension ladder 3, which are sequentially nested from top to bottom. The top ladder 2 and the extension ladder 3 each include a central ladder tube 4 and several sets of symmetrical step rods 5. The sets of step rods 5 are evenly connected from top to bottom to the outside of the central ladder tube 4. The top of the central ladder tube 4 of the top ladder 2 is equipped with a connecting joint 6 for connecting with the external support crossbar 1. Adjacent central ladder tubes 4 are nested together and equipped with connecting components. Specifically, the two ends of the central ladder tube 4 of the extension ladder 3 and the bottom end of the central ladder tube 4 of the top ladder 2 are respectively provided with two vertically distributed connecting pin holes 27. The connecting component is a pin that matches the connecting pin hole 27. In scenarios with multiple extension ladders 3, the central ladder tube 4 of the extension ladder 3 is set as a tube with a small top diameter and a large bottom diameter, so that two extension ladders 3 of the same specification can be nested together. The pin can be directly made of a combination of bolts and nuts. Two bolts are inserted into the connecting pin holes 27 of the two central ladder tubes 4, and the positions of the bolts are defined by nuts.

[0029] like Figure 3As shown, the working platform includes a horizontal platform step 7, two side connecting rods 8, and two limiting hooks 9. The bottom ends of the two side connecting rods 8 are fixedly connected to both sides of the horizontal platform step 7, and the top ends of the two side connecting rods 8 are fixedly connected to one end of each of the two limiting hooks 9. The two limiting hooks 9 are used to hook onto the bottom step bar 5. The horizontal platform step 7 extends into the well, providing workers with a stable foothold. The side connecting rods 8 connect the horizontal platform step 7 and the heads of the limiting hooks 9. The limiting hooks 9 enable the hook connection between the ladder assembly in the well and the working platform, thus achieving flexible assembly and disassembly of the underground working ladder and adjustment of the working height, making it more convenient for practical use. The height adjustment can be achieved by hooking the limiting hooks 9 onto the step bars 5 at different heights.

[0030] The usage process and technical advantages of this utility model of the underground working ladder are as follows: First, the entire underground working ladder is assembled outside the well. The process is as follows: Select the top ladder 2 and the corresponding number of extension ladders 3 according to the required depth of underground operation. Then, connect the top ladder 2 to the support crossbar 1 outside the well through the connecting joint 6. Then, connect the extension ladder 3 and the top ladder 2, and connect the extension ladder 3 to each other through the connecting components. Then, hook the limiting hook 9 of the working platform onto the step bar 5 of the lowest extension ladder 3. At this point, the entire underground working ladder can be installed outside the well.

[0031] After installation, first extend one end of the working platform into the target working well, and finally extend the top ladder 2 into the well. Place both ends of the external support crossbar 1 across the edge of the target working well. At this time, the angle and position of the working ladder can be adjusted according to actual needs. Generally, the two ends of the back of the working platform and the two ends of the step ladder are pressed tightly against the well wall, so that when personnel go down into the well, they can steadily and gradually descend into the well along the step ladder. During this process, the working ladder has more support points, making the working ladder more stable during the descent. Until the bottom of the working ladder is reached, personnel can stand on the horizontal platform step 7, so that personnel can stand firmly with sufficient platform support, which facilitates the actual work inside the well.

[0032] The underground working ladder of this utility model is a multi-section split ladder body, which is simple and convenient to install and disassemble. It can be separated for transportation, occupying little space and making transportation and use more convenient. It can be used for operations at different target depths and can be flexibly adjusted according to the actual situation. It has a high degree of flexibility in actual use and is more conducive to practical and convenient use.

[0033] As one embodiment of this utility model, such as Figure 2As shown, the external support crossbar 1 is equipped with an anti-rolling mechanism. The external support crossbar 1 is a square-section rod. The anti-rolling mechanism includes several limiting crossbars 10 and square pads 11. Several horizontal through holes are provided through the external support crossbar 1, and the limiting crossbars 10 are inserted into the through holes. Several square pads 11 are provided through the square pads 11, and several square pads 11 are respectively fitted onto both ends of the limiting crossbars 10. This increases the contact area between the external support crossbar 1 and the wellhead edge, prevents the external support crossbar 1 from rolling, increases the stability of the underground working ladder, and improves the overall safety of construction.

[0034] Specifically, the top of the external support crossbar 1 is fixedly equipped with a hanging lug 12, which is a semi-circular or hook-shaped hanging lug 12. The hanging lug 12 can be used to fix the external support crossbar 1, or to suspend the safety rope of the workers.

[0035] As one embodiment of this utility model, such as Figure 4 As shown, the connecting joint 6 includes a joint base plate 13, a joint front plate 14, a joint top plate 15, a movable rear pin plate 16, and movable bolts 17. The bottom surface of the joint base plate 13 is fixedly connected to the top end of the central ladder tube 4 of the top ladder 2. The top and bottom ends of the joint front plate 14 are respectively vertically fixedly connected to the top end of the joint top plate 15 and the front end of the joint base plate 13. The rear ends of the joint top plate 15 and the joint base plate 13 are provided with pin holes that match the movable rear pin plate 16. The bottom end of the movable rear pin plate 16 passes through two pin holes. Inside the plate hole, a pin hole is provided at the part where the bottom end of the movable rear pin plate 16 passes through the pin hole on the joint base plate 13. A spiral groove is provided at the top end of the central ladder tube 4 of the top ladder 2 corresponding to the position of the pin hole. One end of the movable bolt 17 passes through the pin hole and is screwed into the spiral groove. The cavity formed by the joint base plate 13, the joint front plate 14, the joint top plate 15, and the movable rear pin plate 16 is used to install the external support crossbar 1, realizing the detachable connection between the external support crossbar 1 and the connecting joint 6, which facilitates actual transportation and management.

[0036] Specifically, an expansion plate 18 is provided at the top of the movable rear pin plate 16, which can limit the position of the movable rear pin plate 16.

[0037] As one embodiment of this utility model, such as Figure 5 As shown, the limiting hook 9 includes a hook rear plate 19, a hook top plate 20, a hook front plate 21, and a hook bottom plate 22. The front and rear ends of the hook top plate 20 are fixedly connected to the top of the hook front plate 21 and the top of the hook rear plate 19, respectively. The front side of the hook bottom plate 22 is fixedly connected to the bottom of the hook front plate 21, and the rear bottom surface of the hook bottom plate 22 is fixedly connected to the side connecting rod 8.

[0038] A transverse connecting rod 23 connects the two side connecting rods 8. An inclined connecting rod 24 connects the front side of the hook front plate 21 to the front side of the transverse platform pedal 7. A reinforcing connecting rod 25 connects the transverse platform pedal 7 and the side connecting rod 8 to the middle of the inclined connecting rod 24. This can strengthen the structural strength of the entire work platform and make it safer and more reliable in actual use.

[0039] In one embodiment of this utility model, the end of the step bar 5 furthest from the central ladder tube 4 is inclined backward. When the working ladder is placed in the well, it can better rest against the well wall, utilizing the well wall for support, thereby increasing the stability of personnel during operation. Under this design, the working platform can only be hung on the bottommost step bar 5 of the central ladder tube 4, and the overall ladder length is adjusted by adjusting the number of extension ladders 3. The top surface of the step bar 5 is provided with anti-slip grooves, which can make it more stable for personnel to step on.

[0040] An anti-slip limit block 26 is provided at the end of the step bar 5 away from the central ladder tube 4. The top of the anti-slip limit block 26 is higher than the top of the step bar 5. When the limit hook 9 is engaged, it can prevent the step bar 5 from slipping off the free end, thus improving the safety of personnel during actual operation.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A downhole service ladder characterized by: The utility model provides a well outside support cross pole (1), well inner ladder assembly and operation platform are included; The well outside support cross pole (1) is used for being transversely arranged on the well mouth along the top of target operation well; The well inner ladder assembly includes top ladder (2) and at least one extension ladder (3) which are sequentially sleeved from top to bottom, the top ladder (2) and the extension ladder (3) include a center ladder pipe (4) and a plurality of groups of two symmetrical step poles (5) respectively, and the plurality of groups of step poles (5) are uniformly connected on the outside of the center ladder pipe (4) from top to bottom;The top of the center ladder pipe (4) of the top ladder (2) is provided with a connecting joint (6) for connecting with the well outside support cross pole (1), and the center ladder pipe (4) is sleeved and provided with a connecting assembly between adjacent two center ladder pipes (4); The operation platform includes a horizontal platform step (7), two side connecting rods (8) and two limiting hooks (9), the bottom ends of the two side connecting rods (8) are fixedly connected with the two sides of the horizontal platform step (7) respectively, the top ends of the two side connecting rods (8) are fixedly connected with one ends of the two limiting hooks (9) respectively, and the two limiting hooks (9) are used for being hung on the step poles (5).

2. A downhole service ladder according to claim 1, characterised in that: The well outside support cross pole (1) is provided with an anti-rolling mechanism, the well outside support cross pole (1) is a rod body with a square cross section, the anti-rolling mechanism includes a plurality of limiting cross poles (10) and square pads (11), a plurality of horizontal perforations are provided through the well outside support cross pole (1), the limiting cross poles (10) are arranged in the perforations, and the square pads (11) are provided with sleeve holes through the square pads (11).

3. A downhole service ladder according to claim 2, characterised in that: The top of the well outside support cross pole (1) is fixedly provided with an ear (12), and the ear (12) is a half-ring or a hook-shaped ear (12).

4. A downhole service ladder according to claim 3, characterised in that: The connecting joint (6) includes a joint bottom plate (13), a joint front plate (14), a joint top plate (15), a movable rear pin plate (16) and a movable bolt (17), the bottom surface of the joint bottom plate (13) is fixedly connected with the top end of the center ladder pipe (4) of the top ladder (2), the top end and the bottom end of the joint front plate (14) are fixedly connected with the top end of the joint top plate (15) and the front end of the joint bottom plate (13) respectively, the rear ends of the joint top plate (15) and the joint bottom plate (13) are provided with pin plate holes matched with the movable rear pin plate (16) through, the bottom end of the movable rear pin plate (16) is arranged in the two pin plate holes, the bottom end of the movable rear pin plate (16) is provided with a pin hole through the part where the bottom end of the movable rear pin plate (16) penetrates out of the pin plate hole of the joint bottom plate (13), the top end of the center ladder pipe (4) of the top ladder (2) is provided with a spiral groove corresponding to the position of the pin hole, and one end of the movable bolt (17) penetrates through the pin hole and is screwed into the spiral groove;The cavity surrounded by the joint bottom plate (13), the joint front plate (14), the joint top plate (15) and the movable rear pin plate (16) is used for penetrating the well outside support cross pole (1).

5. A downhole service ladder according to claim 4, characterised in that: The top end of the post plate (16) is provided with an expansion plate (18).

6. A downhole service ladder according to claim 5, characterised in that: The limiting hook (9) comprises a hook back plate (19), a hook top plate (20), a hook front plate (21), and a hook bottom plate (22). The front and rear ends of the hook top plate (20) are fixedly connected with the top end of the hook front plate (21) and the top end of the hook back plate (19) respectively. The front side of the hook bottom plate (22) is fixedly connected with the bottom end of the hook front plate (21), and the rear end bottom surface of the hook bottom plate (22) is fixedly connected with the side connecting rod (8).

7. A downhole service ladder according to claim 6, characterised in that: Two lateral connecting rods (8) are connected with a transverse connecting rod (23). The front side of the hook front plate (21) and the side front end of the transverse platform pedal (7) are connected with an inclined connecting rod (24). The connecting part of the transverse platform pedal (7) and the side connecting rod (8) is connected with the middle part of the inclined connecting rod (24) with a reinforcing connecting rod (25).

8. A downhole service ladder according to claim 7, characterised in that: The end of the step rod (5) away from the center ladder pipe (4) is inclined toward the rear side. The top surface of the step rod (5) is provided with anti-skid lines.

9. A downhole service ladder according to claim 8, characterised in that: The end of the step rod (5) away from the center ladder pipe (4) is provided with an anti-falling limiting block (26), and the top end of the anti-falling limiting block (26) is higher than the top end of the step rod (5).

10. A downhole service ladder according to claim 9, characterised in that: The two ends of the center ladder pipe (4) of the extension ladder (3) and the bottom end of the center ladder pipe (4) of the top ladder (2) are respectively provided with two connection pin holes (27) distributed upward and downward, and the connecting assembly is a pin column matched with the connection pin hole (27).

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