Prefabricated hoisting device and hoisting method for reinforced concrete inspection well

Abstract

The invention relates to the technical field of inspection well hoisting, and discloses a reinforced concrete inspection well prefabricated hoisting device and a hoisting method.The reinforced concrete inspection well prefabricated hoisting device comprises a positioning mechanism, and the positioning mechanism is used for pre-positioning an inspection well and comprises a square frame. Through the design of the positioning mechanism and the displacement mechanism, the second supporting legs below the square frame can keep stable after making contact with the ground, even if the square frame deviates from the target position where the inspection well needs to be placed, the inspection well can be driven by the transverse moving assembly and the longitudinal moving assembly to transversely and longitudinally move subsequently, and therefore the position of the inspection well is adjusted; the inspection well can move to the position above the target position, in the process, due to the fact that the second supporting legs fall on the ground and keep stable, the connecting frame and the transverse moving assembly on the square frame also have good stability, workers do not need to hold the inspection well with hands to adjust the position, and the working efficiency is improved. And compared with a mode of singly adopting a rope for hoisting, the method is safer.

Description

Technical Field

[0001] The invention relates to the technical field of manhole hoisting, and in particular to a prefabricated hoisting device and a hoisting method for a reinforced concrete manhole. Background Art

[0002] Prefabricated parts refer to concrete products that are processed and produced in a standardized and mechanized manner in a factory. Reinforced concrete prefabricated parts are those in which steel bars are inserted into the interior during the production process. Prefabricated parts are widely used in construction, transportation, water conservancy and other fields. Among them, inspection wells are a common prefabricated part. The main body of the inspection well is a cylinder or square cylinder with several circular holes on its side walls. The weight of the reinforced concrete inspection well is relatively large, and special equipment is required to lift, transport and install it.

[0003] At present, reinforced concrete inspection wells are mostly fixed on the lifting equipment by ropes and steel cables when hoisting. This method requires repeated adjustments when lowering the inspection well to align it with the target position. Due to the heavy weight of the inspection well, the adjustment is very difficult. The shaking during adjustment of the inspection well may also cause safety problems such as pinching fingers. This method cannot guarantee the safety of the installers. At the same time, some special lifting devices are large in size and inconvenient to store and transport.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the prior art, the present invention provides a prefabricated lifting device and lifting method for reinforced concrete inspection wells, which have the advantages of being able to pre-position, accurately adjust the position of the inspection well and be foldable, thereby solving the problem of safety hazards and large space occupation when staff manually adjust the inspection well.

[0007] (II) Technical solution

[0008] In order to solve the technical problems of the above-mentioned prefabricated hoisting device and hoisting method for reinforced concrete inspection wells, the present invention provides the following technical solutions:

[0009] A prefabricated hoisting device and hoisting method for a reinforced concrete inspection well, comprising:

[0010] A positioning mechanism, the positioning mechanism is used to pre-position the inspection well, and the positioning mechanism includes a square frame;

[0011] A connecting frame, the connecting frame is fixedly connected to the square frame, and the connecting frame facilitates the connection of the crane to the square frame;

[0012] A displacement mechanism, the displacement mechanism is slidably connected to the outer surface of the connecting frame, and the displacement mechanism is used to adjust the position of the inspection well;

[0013] A clamping assembly, which is fixedly connected to the bottom of the displacement mechanism, and the displacement mechanism can drive the clamping assembly to move, and the clamping assembly is used to take and place the inspection well;

[0014] A steel wire rope, the steel wire rope is arranged above the connecting frame, and the steel wire rope is used to connect the crane and the connecting frame;

[0015] The clamping assembly is started to clamp the inspection well, and the crane reels in the wire rope to lift the clamping assembly and the inspection well. When the inspection well is lowered after moving to the destination, the positioning mechanism first contacts the ground to keep the inspection well stable, and then the position of the clamping assembly and the inspection well is adjusted through the displacement mechanism so that the inspection well is accurately aligned with the target position.

[0016] Preferably, the positioning mechanism also includes a first supporting leg slidably connected to the bottom of the square frame, a driving assembly is provided on the top of the square frame, a second supporting leg is provided at the bottom of the first supporting leg, and a rotating assembly is installed between the first supporting leg and the second supporting leg.

[0017] Preferably, the driving assembly includes a shell, a first motor is fixedly connected to the interior of the shell, the shell and the first motor are both fixedly connected to the square frame, a first pulley is fixedly connected to the output shaft of the first motor, a belt is fixedly installed on the outer surface of the first pulley, the first pulley is connected to the second pulley through a belt drive, a first screw is fixedly connected to the outer surface of the second pulley, a first slider is threadedly connected to the outer surface of the first screw, the first slider is slidably connected to the interior of the square frame, and the first slider is fixedly connected to the first supporting leg.

[0018] Preferably, the rotating assembly includes a rotating block, which is fixedly connected to the second supporting leg, a slot and a screw hole are provided on the outer surface of the first supporting leg, a pin is rotatably connected to the outer surface of the first supporting leg, the rotating block is rotatably connected to the inside of the slot through the pin, and a bolt is threadedly connected to the inside of the screw hole.

[0019] Preferably, the displacement mechanism includes a transverse movement assembly, which is slidably connected to the outer surface of the connecting frame, and the bottom of the transverse movement assembly is fixedly connected to an electric push rod, and the movable end of the electric push rod is fixedly connected to a longitudinal movement assembly, the longitudinal movement assembly has the same structure as the transverse movement assembly, and the longitudinal movement assembly is fixedly connected to the clamping assembly.

[0020] Preferably, the transverse movement assembly comprises a movable frame, the outer surface of the movable frame is rotatably connected to a pulley, the outer surface of the connecting frame is provided with a wheel groove, and the pulley is slidably connected inside the wheel groove.

[0021] Preferably, the clamping assembly includes a square seat, the top of the square seat is fixedly connected to a second motor, the output shaft of the second motor is fixedly connected to a second screw, the second motor is fixedly connected to the bottom of the longitudinal movement assembly, the outer surface of the second screw is threadedly connected to a second slider, the second slider is slidably connected to the inside of the square seat, and the outer surface of the second slider is fixedly connected to a round rod.

[0022] A hoisting method for a hoisting device:

[0023] S1: The displacement mechanism drives the clamping mechanism to approach the inspection well, so that the clamping mechanism enters the circular hole on the side of the inspection well, and then the displacement mechanism drives the clamping mechanism and the inspection well to rise, so that the inspection well leaves the ground;

[0024] S2: The crane drives the positioning mechanism, displacement mechanism and inspection movement through the wire rope, and after moving to the destination, lowers the positioning mechanism so that the positioning mechanism falls near the target position where the inspection well needs to be placed;

[0025] S3: The displacement mechanism drives the clamping assembly and the inspection well to move, so that the staff can fine-tune the position of the inspection well. At this time, since the positioning mechanism has fallen to the ground, the displacement mechanism and the inspection well on the positioning mechanism will not shake. The displacement mechanism drives the clamping assembly and the inspection well to descend, so that the inspection well falls into the target position and separates the clamping assembly from the inspection well.

[0026] (III) Beneficial effects

[0027] Compared with the prior art, the present invention provides a prefabricated lifting device and lifting method for a reinforced concrete inspection well, which has the following beneficial effects:

[0028] 1. Through the design of the positioning mechanism and the displacement mechanism, the second supporting leg under the square frame will remain stable after contacting the ground. Even if the square frame deviates from the target position for placing the inspection well, the transverse movement assembly and the longitudinal movement assembly can subsequently drive the inspection well to move horizontally and vertically, thereby adjusting the position of the inspection well so that the inspection well can be moved above the target position. During this process, since the second supporting leg has fallen to the ground and remains stable, the connecting frame and the transverse movement assembly on the square frame also have good stability. Therefore, there is no need for staff to adjust the position of the inspection well by hand. When the transverse movement assembly and the longitudinal movement assembly adjust the position of the inspection well, the inspection well itself will not shake, which is safer than a single method of lifting with ropes.

[0029] 2. The present invention adopts the design of the rotating assembly. After use, the bolts are removed to release the limiting fixation of the rotating block and the second supporting leg, and the second supporting leg and the rotating block are pushed to rotate around the pin shaft until the second supporting leg and the first supporting leg are perpendicular to each other. The bolts are then installed into the screw holes on the first supporting leg. The ends of the bolts are pressed against the rotating block to fix it, and the second supporting leg is fixed accordingly. At this time, the overall height of the lifting device is reduced, making it easy to put it into the carriage for transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the positioning assembly of the present invention in a folded state;

[0031] Figure 2 This is a schematic diagram of the structure of the positioning component of the present invention in an expanded state;

[0032] Figure 3 It is a schematic diagram of the structure of the driving assembly of the present invention;

[0033] Figure 4 This is a schematic diagram of the first screw structure of the present invention;

[0034] Figure 5 For the present invention Figure 2 A schematic diagram of the structure enlargement in the middle;

[0035] Figure 6 It is a schematic diagram of the cross-sectional structure of the square seat of the present invention;

[0036] Figure 7 It is a flow chart of the hoisting method of the present invention.

[0037] In the figure: 1. positioning mechanism; 11. square frame; 12. first supporting leg; 13. driving assembly; 131. housing; 132. first motor; 133. first pulley; 134. belt; 135. second pulley; 136. first screw; 137. first slider; 14. rotating assembly; 141. rotating block; 142. notch; 143. pin; 144. screw hole; 145. bolt; 15. second supporting leg; 2. connecting frame; 3. displacement mechanism; 31. transverse moving assembly; 311. moving frame; 312. pulley; 313. wheel groove; 32. electric push rod; 33; longitudinal moving assembly; 4. clamping assembly; 41. square seat; 42. second motor; 43. second screw; 44. second slider; 45. round rod; 5. wire rope. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, the present application proposes a prefabricated lifting device and lifting method for a reinforced concrete inspection well.

[0040] See also Figure 1-7 , a prefabricated lifting device and lifting method for reinforced concrete inspection well, comprising:

[0041] A positioning mechanism 1, the positioning mechanism 1 is used to pre-position the inspection well, and the positioning mechanism 1 includes a square frame 11;

[0042] A connecting frame 2, wherein the connecting frame 2 is fixedly connected to the square frame 11, and the connecting frame 2 facilitates the connection between the crane and the square frame 11;

[0043] A displacement mechanism 3, wherein the displacement mechanism 3 is slidably connected to the outer surface of the connecting frame 2, and the displacement mechanism 3 is used to adjust the position of the inspection well;

[0044] A clamping assembly 4, wherein the clamping assembly 4 is fixedly connected to the bottom of the displacement mechanism 3, and the displacement mechanism 3 can drive the clamping assembly 4 to move, and the clamping assembly 4 is used to take and place the inspection well;

[0045] The steel wire rope 5 is arranged above the connecting frame 2, and the steel wire rope 5 is used to connect the crane and the connecting frame 2.

[0046] The crane drives the wire rope 5, the connecting frame 2 and the positioning mechanism 11 to move, so that the positioning mechanism 11 is located above the inspection well, and the displacement mechanism 3 is started to drive the clamping assembly 4 to move along the connecting frame 2. When the clamping assembly 4 enters the circular hole on the side of the inspection well, the clamping assembly 4 is started to move away from each other to resist the edge of the circular hole of the inspection well to ensure the stability of the inspection well. The displacement mechanism 3 drives the clamping assembly 4 and the inspection well to move upward, so that the inspection well leaves the ground, and then the wire rope 5 is reeled in to lift the positioning mechanism 1 and the inspection well and move them to the vicinity of the desired placement position, and the wire rope 5 is released to make the positioning mechanism 1 descend and contact the ground. At this time, there is still a certain distance between the inspection well and the target position, and the displacement mechanism 3 drives the clamping assembly 4 and the inspection well to move horizontally and vertically, so that the inspection well is located above the target position, and then the displacement mechanism 3 drives the inspection well to descend and fall into the target position, and the clamping assemblies 4 approach each other to separate them from the edge of the circular hole of the inspection well, and then the displacement mechanism 3 is driven to drive the clamping assembly 4 to move out of the inspection well.

[0047] The present invention connects the positioning mechanism 1, the displacement mechanism 3 and the clamping assembly 4. The positioning mechanism 1 is lowered to the vicinity of the target position for placing the inspection well. The displacement mechanism 3 is then started to drive the clamping assembly 4 and the inspection well to adjust the position, so that the inspection well can be accurately aligned with the target position. After alignment, the inspection well can be lowered. During this process, even if the positioning mechanism 1 deviates from the target position, the position of the inspection well can be adjusted through the displacement mechanism 3. After the positioning mechanism 1 is lowered and contacts the ground, the displacement mechanism 3 and the inspection well on the positioning mechanism 1 can be kept stable to avoid shaking of the inspection well. The inspection well can then be adjusted and lowered by the displacement mechanism 3. There is no need for staff to manually support the inspection well to adjust the position, thereby avoiding safety accidents.

[0048] Furthermore, for the above-mentioned positioning mechanism 1, the positioning mechanism 1 also includes a first supporting leg 12 slidably connected to the bottom of the square frame 11, a driving assembly 13 is arranged on the top of the square frame 11, a second supporting leg 15 is arranged at the bottom of the first supporting leg 12, and a rotating assembly 14 is installed between the first supporting leg 12 and the second supporting leg 15.

[0049] There are four groups of first supporting legs 12 , rotating components 14 and second supporting legs 15 , and the four groups of second supporting legs 15 have different rotating directions.

[0050] The driving assembly 13 drives the first supporting leg 12 to move so that the distance between the first supporting legs 12 is adjusted to a suitable position, and the square frame 11 drives the first supporting leg 12 and the second supporting leg 15 to descend, so that the second supporting leg 15 contacts the ground to support the square frame 11, thereby ensuring the stability of the square frame 11 displacement mechanism 3 and the inspection well.

[0051] Further, for the above-mentioned driving component 13, the driving component 13 includes a shell 131, and a first motor 132 is fixedly connected to the interior of the shell 131. The shell 131 and the first motor 132 are both fixedly connected to the square frame 11. A first pulley 133 is fixedly connected to the output shaft of the first motor 132. A belt 134 is fixedly installed on the outer surface of the first pulley 133. The first pulley 133 is connected to a second pulley 135 through the belt 134. The outer surface of the second pulley 135 is fixedly connected to a first screw 136. The outer surface of the first screw 136 is threadedly connected to a first slider 137. The first slider 137 is slidably connected to the interior of the square frame 11, and the first slider 137 is fixedly connected to the first supporting leg 12.

[0052] Start the first motor 132, the first motor 132 drives the first pulley 133 to rotate, the first pulley 133 drives the second pulley 135 and the first screw 136 to rotate through the belt 134, the first screw 136 drives the first slider 137 and the first supporting leg 12 to move, so that the first supporting legs 12 can move away from or closer to each other, which is convenient for the staff to adjust the position of the first supporting leg 12 according to the actual needs of the construction site.

[0053] Furthermore, for the above-mentioned rotating assembly 14, the rotating assembly 14 includes a rotating block 141, the rotating block 141 is fixedly connected to the second supporting leg 15, the outer surface of the first supporting leg 12 is provided with a slot 142 and a screw hole 144, the outer surface of the first supporting leg 12 is rotatably connected with a pin shaft 143, the rotating block 141 is rotatably connected to the inside of the slot 142 through the pin shaft 143, and the internal thread of the screw hole 144 is connected with a bolt 145.

[0054] When the lifting device is no longer needed after the inspection well is installed, remove the bolt 145 to release the limiting fixation of the rotating block 141 and the second supporting leg 15, push the second supporting leg 15 and the rotating block 141 to rotate around the pin shaft 143, so that the second supporting leg 15 and the first supporting leg 12 are perpendicular to each other, and then install the bolt 145 into another screw hole 144 to limit and fix the rotating block 141. When the rotating block 141 is fixed, the second supporting leg 15 is also fixed, which can reduce the overall height of the lifting device and facilitate storage and transportation.

[0055] Furthermore, for the above-mentioned displacement mechanism 3, the displacement mechanism 3 includes a transverse movement component 31, and the transverse movement component 31 is slidably connected to the outer surface of the connecting frame 2. The bottom of the transverse movement component 31 is fixedly connected to an electric push rod 32, and the movable end of the electric push rod 32 is fixedly connected to a longitudinal movement component 33. The longitudinal movement component 33 has the same structure as the transverse movement component 31, and the longitudinal movement component 33 is fixedly connected to the clamping component 4.

[0056] The transverse movement component 31 drives the clamping component 4 to move along the connecting frame 2, the telescopic movement of the electric push rod 32 can drive the clamping component 4 to move up and down, and the longitudinal movement component 33 can drive the clamping component 4 to move along the direction of the first screw rod 136. The three cooperate with each other to move the clamping component 4 to different positions, which is convenient for taking and placing operations on the inspection well.

[0057] Furthermore, for the above-mentioned transverse movement component 31, the transverse movement component 31 includes a moving frame 311, the outer surface of the moving frame 311 is rotatably connected to a pulley 312, the outer surface of the connecting frame 2 is provided with a wheel groove 313, and the pulley 312 is slidably connected inside the wheel groove 313.

[0058] The movable frame 311 is equipped with a motor and other equipment for driving the pulley 312 to rotate. When the pulley 312 rotates, it can drive the movable frame 311 to move along the connecting frame 2. The movable frame 311 drives the electric push rod 32 and the clamping assembly 4 to move. The pulley 312 is always located in the wheel groove 313. The wheel groove 313 can limit the moving distance of the pulley 312 to prevent the pulley 312 from detaching from the connecting frame 2.

[0059] Furthermore, for the above-mentioned clamping assembly 4, the clamping assembly 4 includes a square seat 41, the top of the square seat 41 is fixedly connected to a second motor 42, the output shaft of the second motor 42 is fixedly connected to a second screw 43, the second motor 42 is fixedly connected to the bottom of the longitudinal movement assembly 33, the outer surface of the second screw 43 is threadedly connected to a second slider 44, the second slider 44 is slidably connected to the inside of the square seat 41, and the outer surface of the second slider 44 is fixedly connected to a round rod 45.

[0060] The electric push rod 32 pushes the square seat 41 down, and the moving frame 311 drives the square seat 41 close to the inspection well. The round rod 45 on the square seat 41 enters into the round hole on the side of the inspection well, and the second motor 42 on the square seat 41 is started. The second motor 42 drives the second screw 43 to rotate, and the second screw 43 drives the second slider 44 to drive the round rod 45 to move away from each other, so that the round rod 45 is against the edge of the round hole on the inspection well, so as to fix the inspection well and avoid shaking of the inspection well during lifting.

[0061] A hoisting method for a hoisting device:

[0062] S1: The displacement mechanism 3 drives the clamping mechanism 4 to approach the inspection well, so that the clamping mechanism 4 enters the circular hole on the side of the inspection well, and then the displacement mechanism 3 drives the clamping mechanism 4 and the inspection well to rise, so that the inspection well leaves the ground;

[0063] S2: The crane drives the positioning mechanism 1, the displacement mechanism 3 and the inspection movement through the wire rope 5, and after moving to the destination, lowers the positioning mechanism 1 so that the positioning mechanism 1 falls near the target position where the inspection well needs to be placed;

[0064] S3: The displacement mechanism 3 drives the clamping assembly 4 and the inspection well to move, so that the staff can fine-tune the position of the inspection well. At this time, since the positioning mechanism 1 has fallen to the ground, the displacement mechanism 3 and the inspection well on the positioning mechanism 1 will not shake. The displacement mechanism 3 drives the clamping assembly 4 and the inspection well to descend, so that the inspection well falls into the target position and separates the clamping assembly 4 from the inspection well.

[0065] Working principle: When in use, firstly, the crane drives the wire rope 5 and the square frame 11 to move. When the square frame 11 is located above the inspection well, the electric push rod 32 is started to extend and retract to drive the round rod 45 to move up and down, so that the round rod 45 is at the same height as the round hole on the side of the inspection well, and the longitudinal movement component 33 is started to drive the round rod 45 to move and align with the round hole on the side of the inspection well. The pulley 312 drives the movable frame 311 and the round rod 45 to move, so that the round rod 45 enters the round hole on the inspection well, and the second motor 42 is started to drive the round rods 45 away from each other. The round rod 45 is against the edge of the round hole on the inspection well to fix the inspection well, and then the electric push rod 32 is started again to drive the round rod 45 to rise, and the round rod 45 drives the inspection well to move upward to make it leave the ground, and the crane reels in the wire rope 5 to make the square frame 11 Lift it up, and transfer the square frame 11 and the inspection well to the vicinity of the target position where they are to be placed, release the wire rope to make the square frame 11 descend, and the second support leg 15 at the bottom of the square frame 11 contacts and supports the ground, so that the square frame 11 remains stable. At this time, there is still a certain distance between the inspection well below the square frame 11 and the target position, and the position of the inspection well can be adjusted by the movable frame 311 and the longitudinal movement component 33 respectively to drive the inspection well to move horizontally and longitudinally until the inspection well is above the target position, and the electric push rod 32 can push the inspection well down to make it fall accurately. During the lifting process, even if the square frame 11 deviates from the target position, the position of the inspection well can be adjusted laterally by the movable frame 311 and the longitudinal movement component 33. Therefore, there is no need for staff to hold the square frame 11 or the inspection well for positioning, which is safer to use.

[0066] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A prefabricated hoisting device for a reinforced concrete inspection well, comprising: A positioning mechanism (1), the positioning mechanism (1) being used for pre-positioning the inspection well, the positioning mechanism (1) comprising a square frame (11); A connecting frame (2), wherein the connecting frame (2) is fixedly connected to the square frame (11), and the connecting frame (2) facilitates the connection between the crane and the square frame (11); A displacement mechanism (3), the displacement mechanism (3) being slidably connected to the outer surface of the connecting frame (2), and the displacement mechanism (3) being used to adjust the position of the inspection well; A gripping assembly (4), wherein the gripping assembly (4) is fixedly connected to the bottom of the displacement mechanism (3), and the displacement mechanism (3) can drive the gripping assembly (4) to move, and the gripping assembly (4) is used to take in and put out the inspection well; A steel wire rope (5), the steel wire rope (5) being arranged above the connecting frame (2), the steel wire rope (5) being used to connect the crane and the connecting frame (2); The clamping assembly (4) is started to clamp the inspection well, and the crane reels in the wire rope (5) to lift the clamping assembly (4) and the inspection well. When the inspection well is lowered after being moved to the destination, the positioning mechanism (1) first contacts the ground to keep the inspection well stable, and then adjusts the position of the clamping assembly (4) and the inspection well through the displacement mechanism (3) so that the inspection well is accurately aligned with the target position.

2. A prefabricated lifting device for reinforced concrete inspection well according to claim 1, characterized in that: The positioning mechanism (1) further comprises a first supporting leg (12) slidably connected to the bottom of the square frame (11); a driving assembly (13) is arranged on the top of the square frame (11); a second supporting leg (15) is arranged at the bottom of the first supporting leg (12); and a rotating assembly (14) is installed between the first supporting leg (12) and the second supporting leg (15).

3. A prefabricated lifting device for reinforced concrete inspection well according to claim 2, characterized in that: The driving assembly (13) comprises a shell (131), a first motor (132) is fixedly connected to the inside of the shell (131), the shell (131) and the first motor (132) are both fixedly connected to the square frame (11), a first pulley (133) is fixedly connected to the output shaft of the first motor (132), a belt (134) is fixedly installed on the outer surface of the first pulley (133), the first pulley (133) is connected to the second pulley (135) through the belt (134), the outer surface of the second pulley (135) is fixedly connected to the first screw rod (136), the outer surface of the first screw rod (136) is threadedly connected to the first slider (137), the first slider (137) is slidably connected to the inside of the square frame (11), and the first slider (137) is fixedly connected to the first supporting leg (12).

4. A prefabricated lifting device for reinforced concrete inspection well according to claim 3, characterized in that: The rotating assembly (14) comprises a rotating block (141), wherein the rotating block (141) is fixedly connected to the second supporting leg (15), a notch (142) and a screw hole (144) are provided on the outer surface of the first supporting leg (12), a pin shaft (143) is rotatably connected to the outer surface of the first supporting leg (12), the rotating block (141) is rotatably connected to the inside of the notch (142) via the pin shaft (143), and a bolt (145) is threadedly connected to the inside of the screw hole (144).

5. The prefabricated lifting device for reinforced concrete inspection well according to claim 1 is characterized in that: The displacement mechanism (3) comprises a transverse movement assembly (31), wherein the transverse movement assembly (31) is slidably connected to the outer surface of the connecting frame (2), the bottom of the transverse movement assembly (31) is fixedly connected to an electric push rod (32), the movable end of the electric push rod (32) is fixedly connected to a longitudinal movement assembly (33), the longitudinal movement assembly (33) has the same structure as the transverse movement assembly (31), and the longitudinal movement assembly (33) is fixedly connected to the clamping assembly (4).

6. A prefabricated lifting device for reinforced concrete inspection well according to claim 5, characterized in that: The transverse movement assembly (31) comprises a movable frame (311), the outer surface of which is rotatably connected to a pulley (312), the outer surface of the connecting frame (2) is provided with a wheel groove (313), and the pulley (312) is slidably connected inside the wheel groove (313).

7. The prefabricated lifting device for reinforced concrete inspection well according to claim 5 is characterized by: The clamping assembly (4) includes a square seat (41), the top of the square seat (41) is fixedly connected to a second motor (42), the output shaft of the second motor (42) is fixedly connected to a second screw rod (43), the second motor (42) is fixedly connected to the bottom of the longitudinal movement assembly (33), the outer surface of the second screw rod (43) is threadedly connected to a second slider (44), the second slider (44) is slidably connected to the inside of the square seat (41), and the outer surface of the second slider (44) is fixedly connected to a round rod (45).

8. A hoisting method based on the hoisting device according to any one of claims 1 to 7, characterized in that: S1: The displacement mechanism (3) drives the clamping mechanism (4) to approach the inspection well, so that the clamping mechanism (4) enters the circular hole on the side of the inspection well, and then the displacement mechanism (3) drives the clamping mechanism (4) and the inspection well to rise, so that the inspection well leaves the ground; S2: The crane drives the positioning mechanism (1), the displacement mechanism (3) and the inspection movement through the steel wire rope (5), and after moving to the destination, the positioning mechanism (1) is lowered so that the positioning mechanism (1) falls near the target position where the inspection well needs to be placed; S3: The displacement mechanism (3) drives the clamping assembly (4) and the inspection well to move, so that the staff can fine-tune the position of the inspection well. At this time, since the positioning mechanism (1) has fallen to the ground, the displacement mechanism (3) and the inspection well on the positioning mechanism (1) will not shake. The displacement mechanism (3) drives the clamping assembly (4) and the inspection well to descend, so that the inspection well falls into the target position and the clamping assembly (4) is separated from the inspection well.

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