Rescue device for manhole limited space

Abstract

The utility model belongs to the technical field of safety rescue, and discloses a manhole confined space rescue device, a manhole is located on the side wall of a confined space, the manhole confined space rescue device comprises a clamping assembly, a rescue assembly and a control assembly, the clamping assembly is used for clamping the edge of the manhole; the traction mechanism comprises a driving assembly and a traction piece, the driving assembly is arranged on the side, located outside the side wall of the limited space, of the clamping assembly, one end of the traction piece is connected with the output end of the driving assembly, and the other end of the traction piece is used for being connected with a trapped person; and one end of the guide piece is rotationally connected with the end, located in the limited space, of the clamping assembly, and the other end of the guide piece abuts against the bottom face of the limited space. The problem that rescue is difficult when people are trapped in the limited space of the side manhole is solved, the rescue time is greatly shortened, the trapped people cannot miss the best rescue opportunity, and the life safety of the people is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to safety rescue technical field especially relates to a manhole limited space rescue device. BACKGROUND

[0002] In many fields such as industrial production, construction, limited space operation frequently appears, these limited spaces are usually provided with manholes for personnel access and equipment maintenance. However, when personnel operate in the limited space, they may encounter sudden conditions such as poisoning, oxygen deficiency, injury and so on and lose the ability to act, at this time, it is necessary to rescue the trapped personnel quickly and safely, and safety rescue is very important.

[0003] At present, for the rescue of horizontal manholes, tripod can meet the rescue demand to a certain extent due to its stability and certain hoisting function. However, due to the special position of side manholes, the existing rescue equipment is difficult to play a role, leading to many difficulties in side manhole rescue. First, the position of side manhole deviates from the conventional hoisting direction, and the conventional tool cannot reach and provide a stable point of force; secondly, in the process of side manhole rescue, the hoisting and transfer path of personnel is complex, and there is a lack of effective guidance and protection mechanism; moreover, there is no tool specially designed for the characteristics of side manhole at present, and the existing rescue equipment has poor universality and cannot adapt to the special angle and space limitation of side manhole. In most cases, it often depends on the rescue personnel to enter the limited space for carrying, which not only is low in efficiency, but also the rescue personnel themselves face great risks, for example, in the case of toxic and harmful gas leakage, the rescue personnel entering the limited space may suffer the same harm. Therefore, it is urgent to develop a tool specially used for side manhole limited space rescue. SUMMARY

[0004] The utility model aims at providing a manhole limited space rescue device, aiming at solving the problem of difficult rescue when personnel are trapped in the limited space of side manhole.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] A manhole limited space rescue device, the manhole is located in the side wall of the limited space, comprising:

[0007] A clamping assembly for clamping the edge of the manhole;

[0008] A traction mechanism, including a driving assembly and a traction piece, the driving assembly is arranged on one side of the clamping assembly outside the side wall of the limited space, one end of the traction piece is connected to the output end of the driving assembly, and the other end is used for connecting the trapped personnel;

[0009] A guide, one end of which is rotatably connected to one end of the clamping assembly located in the confined space, and the other end of which abuts the bottom surface of the confined space.

[0010] Preferably, the clamping assembly comprises a connecting piece, a first clamping piece and a second clamping piece, the connecting piece connecting the first clamping piece and the second clamping piece, the first clamping piece being used to abut the outer side of the side wall of the confined space, and the second clamping piece being used to abut the inner side of the side wall of the confined space.

[0011] Preferably, the first clamping piece comprises at least one fixed part, the fixed part being threadedly connected to the first clamping piece, and the end of the fixed part being capable of abutting the outer side of the side wall of the confined space.

[0012] Preferably, the end of the fixed part abutting the outer side of the side wall of the confined space is provided with a non-slip pad.

[0013] Preferably, the connecting piece is provided with a guide groove extending along the axis direction of the manhole, the guide groove being used to limit the traction piece.

[0014] Preferably, the driving assembly comprises a take-up reel, a gear box and a driving piece, the take-up reel being provided on the side of the clamping assembly located outside the manhole, one end of the traction piece being fixedly connected to the take-up reel, the gear box being fixedly provided on the side of the clamping assembly located outside the manhole, the output end of the gear box being engaged with the take-up reel, and the output end of the driving piece being in transmission connection with the input end of the gear box.

[0015] Preferably, the first clamping piece is provided with a first mounting part and a second mounting part, the first mounting part being provided in parallel with the connecting piece, the second mounting part being provided perpendicularly to the first mounting part, the take-up reel being provided on the second mounting part, and the gear box being fixedly provided on the first mounting part.

[0016] Preferably, one end of the guide connected to the clamping assembly is provided with a first pin hole, and the guide is detachably rotatably connected to the clamping assembly through the first pin hole.

[0017] Preferably, the bottom surface of the guide and close to the end abutting the bottom surface of the confined space is provided with a second pin hole; the manhole confined space rescue device further comprises a handle, the first pin hole and the second pin hole are both provided with the handle, and the handle can be extended or retracted from the corresponding first pin hole or second pin hole.

[0018] Preferably, the guide comprises a transition section and a main body section, one end of the main body section is rotatably connected to one end of the clamping assembly located in the manhole, the other end of the main body section is connected to one end of the transition section, the other end of the transition section abuts the bottom surface of the confined space, and the thickness of the transition section gradually decreases from the end connected to the main body section to the end abutting the bottom surface of the confined space.

[0019] Advantages:

[0020] The manhole limited space rescue device provided by the utility model, which is designed for the case that the manhole is located at the side wall of the limited space, comprises a clamping assembly, a traction mechanism and a guide piece, wherein the clamping assembly is arranged at the edge of the manhole, the traction mechanism comprises a driving assembly and a traction piece, the driving assembly is arranged at one side of the clamping assembly outside the side wall of the limited space, one end of the traction piece is connected with the output end of the driving assembly, and the other end is connected with the trapped person, one end of the guide piece is rotationally connected with one end of the clamping assembly in the limited space, and the other end is abutted with the bottom surface of the limited space. The rescue tool is clamped at the edge of the manhole, the traction piece is connected with the trapped person before the person enters the limited space, when the person is in an unexpected fainting state in the limited space, the rescuer starts the driving assembly to pull the trapped person out of the limited space through the traction piece and the guide piece, and the trapped person is given first aid and sent to a hospital in time. The utility model solves the problem that it is difficult to rescue the trapped person in the limited space of the side manhole, greatly shortens the rescue time, and ensures the safety of the trapped person. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a side view of the manhole limited space rescue device of the utility model;

[0022] Figure 2 is an axonometric view of the clamping assembly of the manhole limited space rescue device of the utility model;

[0023] Figure 3 is an enlarged view of A of the manhole limited space rescue device of the utility model;

[0024] Figure 4 is an axonometric view of the traction mechanism of the manhole limited space rescue device of the utility model;

[0025] Figure 5 is an axonometric view of the manhole limited space rescue device of the utility model;

[0026] Figure 6 is a schematic view of the guide piece of the manhole limited space rescue device of the utility model;

[0027] Figure 7 is a sectional view of the gear box of the manhole limited space rescue device of the utility model.

[0028] In the drawings:

[0029] 1, manhole; 2, clamping assembly; 3, traction mechanism; 4, guide piece;

[0030] 21, connecting piece; 22, first clamping piece; 23, second clamping piece; 24, fixed part; 31, driving assembly; 32, traction piece; 41, first pin hole; 42, second pin hole; 43, handle; 44, transition section; 45, main body section;

[0031] 211, guide groove; 221, first mounting part; 222, second mounting part; 241, non-slip pad; 311, take-up wheel; 312, gear box; 313, driving piece; 321, snap ring. DETAILED DESCRIPTION

[0032] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0033] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of the embodiment, the terms "upper", "lower", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0036] As Figures 1-7As shown, this embodiment provides a manhole confined space rescue device. This rescue device is designed for situations where the manhole is located on the side wall of a confined space. The manhole confined space rescue device includes a clamping assembly 2, a traction mechanism 3, and a guide 4. The clamping assembly 2 is used to clamp onto the edge of the manhole 1, ensuring that the manhole confined space rescue device can be stably installed at the manhole 1. Figures 2-3 As shown, the clamping assembly 2 includes a connector 21, a first clamping member 22, and a second clamping member 23. The connector 21 connects the first clamping member 22 and the second clamping member 23. One end of the connector 21 is vertically fixedly connected to the first clamping member 22, and the other end of the connector 21 is vertically provided with the second clamping member 23. The first clamping member 22 is used to abut against the outer side of the confined space sidewall, and the second clamping member 23 is used to abut against the inner side of the confined space sidewall. With the structure of the clamping assembly 2 described above, the manhole confined space rescue device can be installed at most manholes 1.

[0037] Preferably, the first clamping member 22 includes at least one fixing part 24, which is threadedly connected to the first clamping member 22, and the end of the fixing part 24 can abut against the outer side of the confined space sidewall. In this embodiment, two fixing parts 24 are provided, which are arranged side by side and pass through the first clamping member 22 and abut against the outer edge of the manhole 1. In order to make the manhole confined space rescue device more secure, the number of fixing parts 24 can be increased as appropriate, but there must be at least one fixing part 24. One or more fixing parts 24 are all within the protection scope of this embodiment.

[0038] like Figure 4 As shown, the traction mechanism 3 includes a drive assembly 31 and a traction member 32. The drive assembly 31 is located on the side of the clamping assembly 2 outside the confined space sidewall. One end of the traction member 32 is used to connect to the output end of the drive assembly 31, and the other end is used to connect to the trapped person. The traction member 32 can be a polyester fiber rope, steel wire rope, nylon rope, etc., and steel wire rope is selected in this embodiment. The drive assembly 31 includes a take-up reel 311, a gearbox 312, and a drive member 313. The take-up reel 311 is located on the side of the clamping assembly 2 outside the manhole 1, and one end of the traction member 32 is fixedly connected to the take-up reel 311. The gearbox 312 is fixedly mounted on the side of the clamping assembly 2 located outside the manhole 1. The output end of the gearbox 312 meshes with the take-up reel 311, and the output end of the drive component 313 is connected to the input end of the gearbox 312. By operating the drive component 31, the traction component 32 can be retracted or extended, thereby achieving the traction rescue of trapped personnel. In this embodiment, the drive component 311 is a handwheel. Rescuers manually rotate the handwheel to retract or extend the traction component 32. The driving method can be selected as electric, pneumatic, or manual according to the actual situation, meeting the rescue needs of various scenarios. Figure 7As shown, the gear box 312 comprises a housing, a first gear 3121, a second gear 3122 and a third gear 3123, the first gear 3121 is an output gear, which is engaged with the take-up wheel 311, the second gear 3122 is an intermediate gear, which transmits the power of the driving member 313 to the first gear 3121, and the third gear 3123 is an input gear of the gear box 312, which is drivingly connected with the driving member 313. By setting the first gear 3121, the second gear 3122 and the third gear 3123 and reasonably selecting the number of teeth thereof, the force used by the rescuer to pull the trapped person can be reduced, thereby saving the rescuer's physical strength, improving the time efficiency of rescue, and ensuring that the trapped person can be rescued from the limited space in the first time.

[0039] As shown in the drawings, Figure 1 One end of the guide member 4 is rotatably connected with one end of the clamping assembly 2 located in the limited space, and the other end of the guide member 4 abuts against the bottom surface of the limited space. Since the manhole 1 is located on the side wall of the limited space, the manhole 1 is at a certain distance from the bottom surface of the limited space, which hinders the rescue of the trapped person, so that the rescuer cannot directly pull the trapped person out of the limited space. The guide member 4 plays a role of a bridge, so that the trapped person can be pulled by the rescuer from the bottom of the limited space to the manhole 1 and rescued.

[0040] Preferably, the first clamping member 22 is further provided with a first mounting portion 221 and a second mounting portion 222, the first mounting portion 221 is arranged in parallel with the connecting member 21, and the second mounting portion 222 is arranged perpendicularly to the first mounting portion 221. The take-up wheel 311 is arranged on the second mounting portion 222, and the gear box 312 is fixedly arranged on the first mounting portion 221.

[0041] Preferably, as shown in the drawings, Figure 4 The end of the pulling member 32 connected with the trapped person is provided with a snap ring 321, which can be directly hooked with the D-ring of the safety belt worn by the person, which is more convenient and improves the work efficiency. If the person has an accident during the work, the direct hooking of the snap ring 321 and the D-ring is also more secure, and the pulling member 32 will not fall off during the rescue and pulling process, thereby ensuring the smooth progress of the rescue.

[0042] Preferably, as shown in the drawings, Figure 3 In order to make the abutment of the fixing portion 24 and the flange edge of the manhole 1 more compact and not to affect the rescue process due to sliding, the end of the fixing portion 24 abutting against the flange edge of the manhole 1 is provided with an anti-skid pad 241, which can be made of rubber or silicone. The anti-skid pad 241 can not only make the manhole limited space rescue device clamping more reliable, but also protect the flange of the manhole 1, so as to prevent the fixing portion 24 from directly abutting against the flange of the manhole 1 and causing scratches or deformation on the surface thereof, thereby prolonging the service life of the equipment.

[0043] Preferably, as shown in the drawings, the connecting piece 21 is provided with a guide groove 211 in the center of the manhole 1 axis direction, which is used to limit the position of the traction member 32, prevent the position of the traction member 32 from deviating during traction, and cause secondary injury to the trapped person; at the same time, in order to prevent the traction member 32 from being excessively worn in the guide groove 211, prolong the service life of the traction member 32, and improve the smoothness of the traction, making the rescue process more smooth, a certain amount of lubricating oil can be applied to the guide groove 211 before use.

[0044] Preferably, as shown in the drawings, the connecting piece 21 is provided with a guide groove 211 in the center of the manhole 1 axis direction, which is used to limit the position of the traction member 32, prevent the position of the traction member 32 from deviating during traction, and cause secondary injury to the trapped person; at the same time, in order to prevent the traction member 32 from being excessively worn in the guide groove 211, prolong the service life of the traction member 32, and improve the smoothness of the traction, making the rescue process more smooth, a certain amount of lubricating oil can be applied to the guide groove 211 before use. Figure 5 Preferably, as shown in the drawings, the connecting piece 21 is provided with a guide groove 211 in the center of the manhole 1 axis direction, which is used to limit the position of the traction member 32, prevent the position of the traction member 32 from deviating during traction, and cause secondary injury to the trapped person; at the same time, in order to prevent the traction member 32 from being excessively worn in the guide groove 211, prolong the service life of the traction member 32, and improve the smoothness of the traction, making the rescue process more smooth, a certain amount of lubricating oil can be applied to the guide groove 211 before use.

[0045] Figure 6 Preferably, as shown in the drawings, the connecting piece 21 is provided with a guide groove 211 in the center of the manhole 1 axis direction, which is used to limit the position of the traction member 32, prevent the position of the traction member 32 from deviating during traction, and cause secondary injury to the trapped person; at the same time, in order to prevent the traction member 32 from being excessively worn in the guide groove 211, prolong the service life of the traction member 32, and improve the smoothness of the traction, making the rescue process more smooth, a certain amount of lubricating oil can be applied to the guide groove 211 before use.

[0046] Preferably, as shown in the drawings, the connecting piece 21 is provided with a guide groove 211 in the center of the manhole 1 axis direction, which is used to limit the position of the traction member 32, prevent the position of the traction member 32 from deviating during traction, and cause secondary injury to the trapped person; at the same time, in order to prevent the traction member 32 from being excessively worn in the guide groove 211, prolong the service life of the traction member 32, and improve the smoothness of the traction, making the rescue process more smooth, a certain amount of lubricating oil can be applied to the guide groove 211 before use. Figure 5 Preferably, as shown in the drawings, the connecting piece 21 is provided with a guide groove 211 in the center of the manhole 1 axis direction, which is used to limit the position of the traction member 32, prevent the position of the traction member 32 from deviating during traction, and cause secondary injury to the trapped person; at the same time, in order to prevent the traction member 32 from being excessively worn in the guide groove 211, prolong the service life of the traction member 32, and improve the smoothness of the traction, making the rescue process more smooth, a certain amount of lubricating oil can be applied to the guide groove 211 before use.​​

[0047] The utility model provides a manhole limited space rescue device operation method:

[0048] Before the operating personnel enters the equipment from the manhole 1, first, the manhole limited space rescue device is installed, the guide piece 4 is assembled with the clamping assembly 2 first, then the guide piece 4 is put into the limited space from the manhole 1, the connecting piece 21 of the clamping assembly 2 passes through the manhole 1, the second clamping piece 23 is located in the manhole 1, the first clamping piece 22 is located outside the manhole 1, and the rotary fixed part 24 is rotated, since the fixed part 24 is screwed with the first clamping piece 22, the antiskid pad 241 of the fixed part 24 gradually approaches and abuts the outer edge of the manhole 1.

[0049] Then, the snap ring 321 of the traction piece 32 is hooked with the D ring of the operating personnel safety belt, and when the operating personnel has an accident in the equipment and needs rescue, the trapped personnel can be reliably pulled.

[0050] During the operating personnel enters the equipment and operates, if no abnormal situation occurs, the manhole limited space rescue device is in standby state, when the emergency state is encountered, such as the personnel fainting in the limited space, the rescue tool can immediately play a role.

[0051] The rescue personnel start to recover the traction piece 32 and pull the trapped personnel to the manhole 1 direction by rotating the hand wheel, in the pulling process, the traction piece 32 moves along the guide groove 211, reduces the shaking and friction, and makes the pulling process more stable.

[0052] The trapped personnel gradually approach the guide piece 4 in the pulling process, when the trapped personnel is pulled to the guide piece 4, the rescue personnel can pull the trapped personnel out of the manhole 1 along the guide piece 4, after the rescue is completed, if the trapped personnel needs to be transferred to other places for further treatment, the guide piece 4 can be disassembled with the clamping assembly 2, the guide piece 4 can be separated from the clamping assembly 2 by disassembling the connecting pin shaft at the first pin hole 41, at this time, the handle 43 at both ends of the first pin hole 41 and the second pin hole 42 of the guide piece 4 can be pulled out, and a rapid stretcher is formed.

[0053] In summary, the manhole limited space rescue device can quickly pull the trapped personnel out of the limited space through the cooperation of the clamping assembly 2, the traction mechanism 3 and the guide 4, compared with the traditional way of relying on rescue personnel to enter the limited space to carry, the rescue time is greatly shortened, the trapped personnel can be transferred to the safe area for treatment in the shortest time, and the survival probability of the trapped personnel is improved; the clamping assembly 2 can be stably installed at the edge of the manhole 1, so that the rescue tool will not be loose or displaced during the rescue process. At the same time, the precise control of the traction mechanism 3 and the auxiliary action of the guide 4 reduce the risk of secondary injury to the trapped personnel during the rescue process. For example, during the traction process, the limiting of the traction piece and the transition section design of the guide piece avoid the collision between the trapped personnel and the internal structure of the limited space; and in some dangerous environments such as toxic and harmful gas environment, the rescue personnel do not need to enter the limited space, which ensures the life safety of the rescue personnel.

[0054] The manhole limited space rescue device not only can realize the traction rescue of the trapped personnel, but also can form a temporary stretcher through the quick disassembly of the guide 4, so as to facilitate the transfer of the trapped personnel. In addition, the clamping assembly 2 can adapt to manholes of different sizes, and the driving mode of the traction mechanism 3 can be selected as electric, pneumatic or manual according to the actual situation, so as to meet the rescue needs of various different scenes.

[0055] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not limited to the embodiments of the utility model. For ordinary skilled persons in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A manhole confined space rescue device, a manhole (1) is located in the side wall of the confined space, characterized in that, The utility model relates to a manhole rescue device, including: Clamping assembly (2) for clamping in the edge of manhole (1); Traction mechanism (3) including drive assembly (31) and traction piece (32), drive assembly (31) is arranged in the side of clamping assembly (2) located outside the side wall of the restricted space, one end of traction piece (32) is connected the output end of drive assembly (31), the other end is used for connecting the trapped personnel; Guide piece (4) one end of guide piece (4) is rotatably connected with the end of clamping assembly (2) located in the restricted space, and the other end is abutted with the bottom surface of the restricted space.

2. The manhole confined space rescue device according to claim 1, wherein, Clamping assembly (2) includes connecting piece (21), first clamping piece (22) and second clamping piece (23), connecting piece (21) connects first clamping piece (22) and second clamping piece (23), first clamping piece (22) is used for abutting with the outside of the side wall of the restricted space, and second clamping piece (23) is used for abutting with the inside of the side wall of the restricted space.

3. The manhole confined space rescue device according to claim 2, wherein, First clamping piece (22) includes at least one fixed part (24), the fixed part (24) is threadedly connected with first clamping piece (22), and the end of fixed part (24) can be abutted on the outside of the side wall of the restricted space.

4. The manhole confined space rescue device according to claim 3, wherein, The end of the fixed part (24) is abutted with the outside of the side wall of the restricted space and is provided with a non-slip pad (241).

5. The manhole confined space rescue device according to claim 2, wherein, Connecting piece (21) is provided with a guide groove (211) extending along the axis direction of manhole (1), and the guide groove (211) is used for limiting traction piece (32).

6. The manhole confined space rescue device according to claim 2, wherein, Drive assembly (31) includes take-up reel (311), gear box (312) and drive piece (313), take-up reel (311) is arranged in the side of clamping assembly (2) located outside manhole (1), one end of traction piece (32) is fixedly connected with take-up reel (311), gear box (312) is fixedly arranged in the side of clamping assembly (2) located outside manhole (1), the output end of gear box (312) is engaged with take-up reel (311), and the output end of drive piece (313) is drivingly connected with the input end of gear box (312).

7. The manhole confined space rescue device according to claim 6, wherein, First clamping piece (22) is provided with first mounting portion (221) and second mounting portion (222), first mounting portion (221) is arranged in parallel with connecting piece (21), second mounting portion (222) is arranged perpendicularly with first mounting portion (221), take-up reel (311) is arranged on second mounting portion (222), and gear box (312) is fixedly arranged on first mounting portion (221).

8. The manhole confined space rescue device according to any one of claims 1-7, wherein, The end of the guide piece (4) is provided with a first pin hole (41), and the guide piece (4) is detachably rotatably connected with the clamping assembly (2) through the first pin hole (41).

9. The manhole confined space rescue device according to claim 8, wherein, The bottom surface of the guide piece (4) is provided with a second pin hole (42) near the end abutting against the bottom surface of the confined space; the manhole confined space rescue device further comprises a handle (43), the first pin hole (41) and the second pin hole (42) are both provided with the handle (43), and the handle (43) can be extended or retracted from the corresponding first pin hole (41) or the second pin hole (42).

10. The manhole confined space rescue device according to any one of claims 1-9, wherein, The guide piece (4) comprises a transition section (44) and a main body section (45), one end of the main body section (45) is rotationally connected with one end of the clamping assembly (2) located in the manhole (1), the other end is connected with one end of the transition section (44), the other end of the transition section (44) abuts against the bottom surface of the confined space, and the thickness of the transition section (44) gradually decreases from one end connected with the main body section (45) to the end abutting against the bottom surface of the confined space.

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