Prestressed concrete hollow pile length and pile splicing quality detection device and method

Abstract

The invention relates to the field of pile foundation detection, in particular to a prestressed concrete hollow pile length and pile splicing quality detection device and method.The prestressed concrete hollow pile length and pile splicing quality detection device comprises a detection instrument, a cable, a detection block, a wheel disc counter, a positioning plate and a limiting assembly, the limiting assembly is connected to the positioning plate, one end of the cable is connected to the detection instrument, and the other end of the cable is connected to the detection block; the wheel disc counter is connected to the surface of the positioning plate, the surface of the positioning plate is provided with a positioning hole for a cable to penetrate through, and the surface of the positioning plate is provided with a limiting hole. Through the arrangement of the detection block, the cable and the wheel disc counter, the detection instrument multiplies the number of turns of the wheel disc counter by the perimeter of the wheel disc to obtain the pile length, accurate measurement of the pile length is achieved, and therefore the detection efficiency of the pile length is improved.

Description

Technical Field

[0001] The present application relates to the field of pile foundation detection, and in particular to a device and method for detecting the length and joint quality of prestressed concrete hollow piles. Background Art

[0002] The prestressed concrete hollow pile is a hollow pile foundation made of prestressed technology and concrete materials. The prestressed concrete hollow pile mainly consists of three parts: a pile head, a pile body, and a pile tip. The bearing capacity of the prestressed concrete hollow pile is jointly composed of the side friction resistance of the pile and the end resistance of the pile. The construction pile length is crucial for the exertion of the side friction resistance of the pile and the end resistance of the pile.

[0003] To ensure the construction quality and safety of the project, it is necessary to detect the pile length. When the designed pile length is relatively long, multiple-section piles need to be used to form the designed pile length, resulting in the detection instrument in the low-strain method being unable to detect the pile bottom signal, making it impossible to effectively detect the pile length, thereby reducing the detection efficiency of the pile length. Summary of the Invention

[0004] In order to improve the problem of the detection efficiency of the pile length, the present application provides a device and method for detecting the length and joint quality of prestressed concrete hollow piles.

[0005] In a first aspect, a device for detecting the length and joint quality of prestressed concrete hollow piles provided by the present application adopts the following technical solution: A device for detecting the length and joint quality of prestressed concrete hollow piles includes a detection instrument, a cable, a detection block, a wheel counter, a positioning plate, and a limiting component. The limiting component is connected to the positioning plate, and the limiting component can limit the positioning plate to the pile head of the hollow pile. One end of the cable is connected to the detection instrument, and the other end of the cable is connected to the detection block. The wheel counter is connected to the surface of the positioning plate, and the wheel counter is electrically connected to the detection instrument. A positioning hole for the cable to pass through is provided on the surface of the positioning plate, and the positioning hole communicates with the inner cavity of the hollow pile. A limiting hole for the cable to pass through is provided on the surface of the positioning plate near the detection end of the wheel counter. When the end of the cable with the detection block sequentially passes through the limiting hole and the positioning hole and is embedded in the inner cavity of the hollow pile, the surface of the cable abuts against the detection end of the wheel counter. The gravity of the detection block drives the cable to pass through the inner cavity of the hollow pile, and the cable between the detection block and the detection instrument is in a taut state.

[0006] By adopting the above technical solution, when it is necessary to detect the pile length of a hollow pile, the end of the cable with a detection block is driven to sequentially pass through the limiting hole and the positioning hole and embed into the inner cavity of the hollow pile. The inner wall of the limiting hole abuts against the outer wall of the cable and limits the detection end of the wheel counter on the surface of the cable, making it difficult for the cable surface to disengage from the detection end of the wheel counter, thereby improving the accuracy of the wheel counter's counting. At the same time, the gravity of the detection block drives the cable to pass through the inner cavity of the hollow pile, and the cable between the detection block and the detection instrument is in a taut state. The staff pulls the cable, driving the cable to overcome the gravity of the detection block and slide along the inner cavity of the hollow pile towards the direction close to the positioning hole. When the end face of the detection block abuts against the surface of the positioning plate facing the hollow pile, stop pulling. The detection instrument multiplies the number of turns of the wheel counter by the wheel circumference to obtain the pile length, realizing the accurate measurement of the pile length, thereby improving the detection efficiency of the pile length.

[0007] Optionally, the limiting assembly includes a plurality of limiting arc blocks. The plate surface of the positioning plate is provided with a plurality of limiting grooves for the limiting arc blocks to slide along at intervals around the axis of the positioning plate. When the plurality of limiting arc blocks slide along the inner wall of the limiting groove towards the direction close to the axis of the positioning plate, the inner arc surface of the limiting arc block abuts tightly against the outer peripheral surface of the hollow pile to form a limit.

[0008] By adopting the above technical solution, when the positioning plate is placed on the pile head of the hollow pile, the plurality of limiting arc blocks are driven to slide along the inner wall of the limiting groove towards the direction close to the axis of the positioning plate. The inner arc surface of the limiting arc block abuts tightly against the outer peripheral surface of the hollow pile to form a limit, enabling the positioning plate to be limited on the pile heads of hollow piles with different diameters, thereby improving the versatility of the detection device.

[0009] Optionally, the positioning plate includes a positioning part and a power part. A power cavity for the power part to slide is coaxially provided on the surface of the positioning part. The power cavity penetrates the outer wall of the positioning part. The limiting groove and the limiting hole are located on the positioning part, and the positioning hole is located on the power part. The limiting assembly further includes a plurality of connecting rods, which correspond to the limiting arc blocks one by one. One end of the connecting rod is rotatably connected to the surface of the limiting arc block, and the other end of the connecting rod is rotatably connected to the surface of the power part. The connecting rod receives the power of the power part and drives the limiting arc block to slide on the inner wall of the limiting groove.

[0010] By adopting the above technical solution, when the positioning part is placed on the pile head of the hollow pile, the power part is driven to slide along the inner wall of the power cavity away from the hollow pile. The connecting rod receives the power of the power part and drives the limiting arc block to slide along the inner wall of the limiting groove towards the direction close to the axis of the positioning part. The inner arc surface of the limiting arc block abuts tightly against the outer peripheral surface of the hollow pile to form a limit, realizing the synchronous sliding of the plurality of limiting arc blocks, thereby improving the simplicity of using the detection device.

[0011] Optionally, the limiting component further includes a plurality of ratchets, a plurality of pawls and a plurality of limiting blocks. The ratchets correspond to the connecting rods one by one. The ratchets are coaxially connected to the rotating shafts of the connecting rods located on the limiting arc blocks. The limiting blocks correspond to the limiting arc blocks one by one. The surface of the limiting arc block is provided with a limiting cavity for the limiting blocks to slide. The pawls correspond to the limiting blocks one by one. The pawls are rotatably connected to the surface of the limiting blocks facing the ratchets. When the limiting blocks approach the ratchets along the inner wall of the limiting cavity, the ends of the pawls are embedded into the ratchet tooth rings to achieve engagement, and the rotation of the connecting rods towards the direction away from the power part is limited.

[0012] By adopting the above technical solution, when the power part slides along the inner wall of the power cavity towards the direction away from the positioning part, driving the limiting arc block to approach the axis of the positioning part along the inner wall of the limiting groove, the inner arc surface of the limiting arc block abuts against the outer peripheral surface of the hollow pile to form a limit. At the same time, the limiting block is driven to approach the ratchet along the inner wall of the limiting cavity, and the end of the pawl is embedded into the ratchet tooth ring to achieve engagement, and the rotation of the connecting rod towards the direction away from the power part is limited, so that the limiting arc block is not easy to move away from the hollow pile along the inner wall of the limiting groove, thereby improving the abutting force between the inner arc surface of the limiting arc block and the outer peripheral surface of the hollow pile.

[0013] Optionally, the limiting component further includes a plurality of driven pistons, a plurality of driving pistons and a plurality of first elastic members. The driving pistons correspond to the limiting arc blocks one by one. The inner arc surface of the limiting arc block is provided with a driving flow channel for the driving pistons to slide. The sliding directions of the driving pistons and the limiting blocks are parallel to each other. The first elastic members correspond to the driving pistons one by one. One end of the first elastic member in the direction of the elastic force is connected to the surface of the driving piston, and the other end of the first elastic member in the direction of the elastic force is connected to the inner wall of the driving flow channel. The first elastic member has an elastic force to drive the driving piston to slide towards the direction away from the driving flow channel, and the end of the driving piston has a tendency to protrude from the inner arc surface of the limiting arc block. The driven pistons correspond to the limiting blocks one by one. The end of the driven piston is connected to the side of the limiting block away from the connecting rod. The inner wall of the limiting cavity is provided with a driven flow channel for the driven pistons to slide. The driving flow channel communicates with the driven flow channel. When the limiting arc block approaches the axis of the positioning part along the inner wall of the limiting groove, the outer peripheral surface of the hollow pile abuts against the end of the driving piston and drives the driving piston to approach the driving flow channel. The end surface of the driving piston is flush with the inner arc surface of the limiting arc block. The air in the driving flow channel enters the driven flow channel to impact the surface of the driven piston, the limiting block approaches the ratchet along the inner wall of the limiting cavity, and the end of the pawl is embedded into the ratchet tooth ring to achieve engagement.

[0014] By adopting the above technical solution, when the power unit slides on the inner wall of the power cavity in a direction away from the positioning part, the connecting rod receives the power of the power unit and drives the limiting arc block to approach the axis of the positioning part along the inner wall of the limiting groove. The outer peripheral surface of the hollow pile abuts against the end of the active piston protruding from the limiting arc block and drives the active piston to approach the active flow channel. The end face of the active piston is flush with the inner arc surface of the limiting arc block. The inner arc surface of the limiting arc block presses tightly against the outer peripheral surface of the hollow pile to form a limit. At the same time, the air in the active flow channel enters the driven flow channel and impacts the driven piston, pushing the limiting block to slide along the inner wall of the limiting cavity in a direction close to the ratchet wheel. The end of the pawl is embedded in the ratchet tooth ring to achieve meshing, realizing the automatic sliding of the limiting block without manual driving by the staff, thereby further improving the simplicity of using the detection device.

[0015] Optionally, the limiting arc block is connected with an adjusting component. The adjusting component includes an adjusting plate, an adjusting piston and an elastic member II. An adjusting flow channel for the adjusting piston to slide is provided on the end face of the limiting arc block away from the connecting rod. The sliding direction of the adjusting piston is parallel to the axis of the positioning part. The adjusting flow channel communicates with the active flow channel and the driven flow channel. The elastic coefficient of the elastic member II is less than that of the elastic member I. One end of the elastic member II in the direction of the elastic force is connected to the inner wall of the adjusting flow channel, and the other end of the elastic member II in the direction of the elastic force is connected to the surface of the adjusting piston. The elastic member II has an elastic force to drive the adjusting piston to slide in a direction away from the adjusting flow channel, and the end of the adjusting piston protrudes from the surface of the limiting arc block. An adjusting cavity for the adjusting plate to slide is provided on the inner wall of the adjusting flow channel. The sliding direction of the adjusting plate is parallel to the sliding direction of the active piston. When driving the adjusting piston to slide in a direction close to the active flow channel and the end of the adjusting piston is flush with the bottom wall of the adjusting cavity, drive the adjusting plate to slide along the inner wall of the adjusting cavity in a direction close to the adjusting flow channel. The plate surface of the adjusting plate presses tightly against the inner wall of the adjusting cavity and closes the adjusting flow channel. The plate surface of the adjusting plate abuts against the end face of the adjusting piston to form a limit.

[0016] By adopting the above technical solution, when the adjusting plate slides along the inner wall of the adjusting cavity towards the direction close to the adjusting flow channel, the plate surface of the adjusting plate abuts against the inner wall of the adjusting cavity and closes the adjusting flow channel. The plate surface of the adjusting plate abuts against the end face of the adjusting piston and limits the adjusting piston in the adjusting flow channel, so that the adjusting piston is not prone to shift on the inner wall of the adjusting flow channel, thereby realizing the limitation of the adjusting piston in the adjusting flow channel. When the detection device completes the detection of the pile length of the hollow pile, the adjusting plate is driven to slide along the inner wall of the adjusting cavity towards the direction away from the adjusting flow channel, and the closing effect of the adjusting plate on the adjusting flow channel disappears. The elastic force of the second elastic member drives the adjusting piston to slide along the inner wall of the adjusting flow channel towards the direction away from the limiting arc block. The end of the adjusting piston protrudes from the end face of the limiting arc block, and the air pressure in the adjusting flow channel decreases. At the same time, the adjusting flow channel communicates with the active flow channel and the driven flow channel. The atmospheric pressure drives the driven piston to slide along the inner wall of the driven flow channel towards the direction away from the ratchet wheel, driving the limiting block to slide along the inner wall of the limiting cavity towards the direction away from the ratchet wheel, and the end of the pawl disengages from the ratchet tooth ring, so that the limiting effect on the rotation of the connecting rod disappears. The power part is driven to slide along the inner wall of the power cavity towards the direction close to the positioning part. The connecting rod receives the power of the power part and drives the limiting arc block to slide along the inner wall of the limiting groove towards the direction away from the axis of the positioning part. The pressing effect of the hollow pile on the active piston disappears, and the elastic coefficient of the first elastic member is greater than that of the second elastic member. The elastic force of the first elastic member drives the active piston to slide along the inner wall of the active flow channel towards the direction away from the active flow channel. The end of the active piston protrudes from the inner arc surface of the limiting arc block, and the air pressure in the active flow channel decreases. The external standard atmospheric pressure drives the adjusting piston to slide along the inner wall of the adjusting flow channel towards the direction close to the active flow channel, and the end face of the adjusting piston is flush with the bottom wall of the adjusting cavity, realizing the automatic reset of the adjusting piston.

[0017] Optionally, the adjusting assembly further includes a third elastic member. One end in the direction of the elastic force of the third elastic member is connected to the end face of the adjusting plate, and the other end in the direction of the elastic force of the third elastic member is connected to the inner wall of the adjusting cavity. The third elastic member has an elastic force to drive the adjusting plate to slide towards the direction close to the adjusting flow channel. The plate surface of the adjusting plate abuts against the inner wall of the adjusting cavity and closes the adjusting flow channel, and the plate surface of the adjusting plate abuts against the end face of the adjusting piston to form a tendency of limitation.

[0018] By adopting the above technical solution, when the end face of the adjusting piston is flush with the bottom wall of the adjusting cavity, the elastic force of the third elastic member drives the adjusting plate to slide along the inner wall of the adjusting cavity towards the direction close to the adjusting flow channel. The plate surface of the adjusting plate abuts against the inner wall of the adjusting cavity and closes the adjusting flow channel, and the plate surface of the adjusting plate abuts against the end face of the adjusting piston and limits the adjusting piston in the adjusting flow channel, realizing the automatic sliding of the adjusting plate, thereby improving the simplicity of using the quality detection device.

[0019] Optionally, the detection block is connected with a pile splicing detection component. The pile splicing detection component includes a plurality of detection rods, a plurality of fourth elastic members, a plurality of rollers and a plurality of rotational speed sensors. A plurality of detection cavities for the rotation of the detection rods are spaced apart on the outer peripheral surface of the detection block. The rotation axis of the detection rod is perpendicular to the axis of the hollow pile. The rollers are in one-to-one correspondence with the detection rods and are rotatably connected to the surface of the detection rod away from the detection block. One end of the fourth elastic member in the direction of the elastic force is connected to the inner wall of the detection cavity, and the other end of the fourth elastic member in the direction of the elastic force is connected to the rotation shaft of the detection rod. The fourth elastic member has an elastic force to drive the detection rod to rotate away from the detection cavity. The roller surface has a tendency to rollingly contact the inner cavity wall of the hollow pile. The rotational speed sensors are in one-to-one correspondence with the detection rods and are connected to the surface of the detection rod close to the roller. The rotational speed sensors are electrically connected to the detection instrument. The rotational speed sensors can detect the rotational speed of the rollers and send the measured values to the detection instrument.

[0020] By adopting the above technical solution, when the cable end with the detection block passes through the positioning hole and is embedded into the inner cavity of the hollow pile, the elastic force of the fourth elastic member drives the detection rod to rotate towards the inner cavity wall of the hollow pile. The roller surface abuts against the inner cavity wall of the hollow pile, pulls the cable to drive the detection block to approach the positioning part along the inner wall of the hollow pile. The roller surface rolls and contacts the inner cavity wall of the hollow pile. The rotational speed sensors detect the rotational speed of the rollers in real time and send the measured values to the detection instrument. When the pile splicing position is broken, the rotational speed of the rollers is slowed down, so that the staff can directly judge the quality of the pile joint position according to the change of the rotational speed of the rollers in the detection instrument, thereby improving the accuracy of the pile splicing quality detection.

[0021] Optionally, the pile splicing detection component further includes a plurality of electromagnets and a plurality of magnetic blocks. The magnetic force of the electromagnets is greater than the elastic force of the fourth elastic member. The electromagnets are in one-to-one correspondence with the detection cavities and are embedded. The magnetic blocks are in one-to-one correspondence with the detection rods and are connected to the surface of the detection rod facing the detection cavity. The electromagnets are electrically connected to the detection instrument. The detection instrument can control the energization of the electromagnets. When the electromagnets are energized and have magnetic force, the electromagnets and the magnetic blocks attract each other with opposite polarities and drive the detection rods to rotate towards the detection cavity and embed.

[0022] By adopting the above technical solution, when the detection instrument controls the electromagnets to be energized, the magnetic force of the electromagnets is greater than the elastic force of the fourth elastic member. The electromagnets and the magnetic blocks attract each other with opposite polarities and drive the detection rods to rotate towards the detection cavity and embed. When the detection block approaches the bottom of the hollow pile, the roller surface is not easily in contact with the inner cavity wall of the hollow pile, thereby reducing the wear of the rollers and prolonging the service life of the quality detection device.

[0023] In a second aspect, a method for detecting the length and pile splicing quality of a prestressed concrete hollow pile provided by the present application adopts the following technical solution: Method for detecting length and joint quality of prestressed concrete hollow pile, using a device for detecting length and joint quality of prestressed concrete hollow pile, including the following steps: Cable installation: The end of the cable passes through the limit hole and the positioning hole in sequence and is installed on the surface of the detection block, and the surface of the cable abuts against the detection end of the roulette counter to form a limit; Positioning plate installation: The plate surface of the positioning plate is placed on the pile head of the hollow pile, and the limiting component limits the positioning plate on the pile head of the hollow pile, and the detection block is located in the inner cavity of the hollow pile; Cable placement: The cable penetrates the hollow pile under the pressure of the detection block, and the cable between the detection block and the detection instrument is in a taut state; Pile length detection: Pull the cable to drive the detection block close to the positioning plate, and the roulette counter sends the value to the detection instrument, and the detection instrument multiplies the value by the circumference of the roulette to obtain the pile length.

[0024] By adopting the above technical solution, the gravity of the detection block drives the cable to pass through the inner cavity of the hollow pile, and the cable between the detection block and the detection instrument is in a taut state. The staff pulls the cable to drive the cable to overcome the gravity of the detection block and slide along the inner cavity of the hollow pile towards the direction close to the positioning hole. When the end face of the detection block abuts against the surface of the positioning plate facing the hollow pile, stop pulling. The detection instrument multiplies the number of turns of the roulette counter by the circumference of the roulette to obtain the pile length, realizing the accurate measurement of the pile length, thereby improving the detection efficiency of the pile length.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The setting of the detection block, cable and roulette counter, the detection instrument multiplies the number of turns of the roulette counter by the circumference of the roulette to obtain the pile length, realizing the accurate measurement of the pile length, thereby improving the detection efficiency of the pile length; 2. The setting of the limiting arc block, the inner arc surface of the limiting arc block abuts tightly against the outer peripheral surface of the hollow pile to form a limit, so that the positioning plate can be limited on the pile heads of hollow piles with different diameters, thereby improving the versatility of the detection device; 3. The setting of the positioning part and the power part, the inner arc surface of the limiting arc block abuts tightly against the outer peripheral surface of the hollow pile to form a limit, realizing the synchronous sliding of multiple limiting arc blocks, thereby improving the simplicity of use of the detection device. Description of the drawings

[0026] Figure 1 is the overall structural schematic diagram in the embodiment of the present application.

[0027] Figure 2 is the partial sectional view in the embodiment of the present application, mainly showing the detection block.

[0028] Figure 3 is the partial structural schematic diagram in the embodiment of the present application, mainly showing the elastic member five.

[0029] Figure 4Yes Figure 2 An enlarged view of part A in

[0030] Figure 5 It is a schematic diagram of the overall structure of the detection block in the embodiment of the present application.

[0031] Figure 6 Yes Figure 2 An enlarged view of part B in

[0032] Explanation of reference numerals: 1, winch; 2, detection instrument; 3, cable; 4, detection block; 41, detection cavity; 5, disc counter; 6, positioning plate; 61, positioning part; 611, power cavity; 612, limiting hole; 613, limiting groove; 62, power part; 621, positioning hole; 7, limiting component; 71, limiting arc block; 711, limiting cavity; 712, active flow channel; 713, driven flow channel; 714, adjusting flow channel; 715, adjusting cavity; 72, connecting rod; 73, ratchet; 74, pawl; 75, driven piston; 76, active piston; 77, first elastic member; 78, fifth elastic member; 79, limiting block; 8, adjusting component; 81, adjusting plate; 82, adjusting piston; 83, second elastic member; 84, third elastic member; 9, joint pile detection component; 91, detection rod; 92, fourth elastic member; 93, roller; 94, electromagnet; 95, magnetic block; 96, rotational speed sensor; 10, hollow pile. Detailed implementation manners

[0033] The following further describes the present application in detail with reference to the Figures 1-6 accompanying drawings.

[0034] The embodiment of the present application discloses a device for detecting the length and joint pile quality of prestressed concrete hollow piles. Refer to Figure 1 and Figure 2, the device for detecting the length and joint quality of prestressed concrete hollow piles includes a winch 1, a detection instrument 2, a cable 3, a detection block 4, a disk counter 5, a positioning plate 6 and a limiting component 7. The positioning plate 6 includes a positioning part 61 and a power part 62. In the embodiment of the present application, the positioning part 61 is a circular plate, and the power part 62 is a rod body. A power cavity 611 for the power part 62 to slide is coaxially opened on the end face of the positioning part 61. The power cavity 611 penetrates the outer wall of the positioning part 61 along the axis of the positioning part 61, and the sliding direction of the power part 62 is parallel to the axis of the positioning part 61. The limiting component 7 is installed between the positioning part 61 and the power part 62. The limiting component 7 can coaxially limit the positioning part 61 on the head of the hollow pile 10. One end of the cable 3 is installed on the detection instrument 2, and the other end of the cable 3 is wound around the outer peripheral surface of the rotating shaft of the winch 1 and detachably installed on the detection block 4. The disk counter 5 is fixed to the plate surface of the positioning plate 6 close to the winch 1 by bolts. The disk counter 5 is electrically connected to the detection instrument 2. A positioning hole 621 for the cable 3 to pass through is coaxially opened on the end face of the power part 62. The positioning hole 621 penetrates the outer wall of the power part 62 along its own axis and communicates with the inner cavity of the hollow pile 10. A limiting hole 612 for the cable 3 to pass through is opened on the plate surface of the positioning part 61 close to the detection end of the disk counter 5. When the cable 3 passes through the limiting hole 612 and the positioning hole 621 in sequence and is connected to the detection block 4, the inner wall of the limiting hole 612 abuts against the surface of the cable 3 and drives the surface of the cable 3 to abut against the detection end of the disk counter 5. The gravity of the detection block 4 drives the cable to pass through the inner cavity of the hollow pile 10, and the cable 3 between the detection block 4 and the detection instrument 2 is in a taut state. The user rotates the rotating shaft of the winch 1 to drive the cable 3 to wind around the outer peripheral surface of the rotating shaft of the winch 1, driving the cable 3 to overcome the gravity of the detection block 4 and approach the positioning hole 621 along the inner cavity of the moving pile. When the end face of the detection block 4 abuts against the surface of the positioning part 61 facing the hollow pile 10, the pulling stops. The disk counter 5 sends the number of rotation turns to the detection instrument 2. The detection instrument 2 multiplies the number of turns of the disk counter 5 by the disk circumference to obtain the pile length, realizing the accurate measurement of the pile length, thereby improving the detection efficiency of the pile length.

[0035] Refer to Figure 3 and Figure 4, the limiting component 7 includes a plurality of limiting arc blocks 71, a plurality of connecting rods 72, a plurality of ratchets 73, a plurality of pawls 74, a plurality of driven pistons 75, a plurality of driving pistons 76, a plurality of first elastic members 77, a plurality of fifth elastic members 78 and a plurality of limiting blocks 79. A plurality of limiting grooves 613 for the limiting arc blocks 71 to slide are formed at intervals on the plate surface of the positioning portion 61 around the axis of the positioning portion 61. The limiting grooves 613 penetrate through the outer wall of the positioning portion 61 along the axis of the positioning portion 61. The axis of the limiting arc block 71 faces the axis of the hollow pile 10, and the inner arc surface of the limiting arc block 71 can abut against the outer peripheral surface of the hollow pile 10. The connecting rods 72 correspond to the limiting arc blocks 71 one by one. One end of the connecting rod 72 is rotatably connected to the end surface of the limiting arc block 71, and the other end of the connecting rod 72 is rotatably connected to the surface of the power portion 62. The connecting rod 72 can receive the power of the power portion 62 and push the limiting arc block 71 to slide on the inner wall of the limiting groove 613.

[0036] Refer to Figure 3 and Figure 4 , the ratchets 73 correspond to the connecting rods 72 one by one. The ratchets 73 are coaxially connected to the rotating shafts of the connecting rods 72 located on the limiting arc blocks 71. The limiting blocks 79 correspond to the limiting arc blocks 71 one by one. Limiting cavities 711 for the limiting blocks 79 to slide are formed on the surface of the limiting arc blocks 71. The sliding direction of the limiting blocks 79 is parallel to the sliding direction of the limiting arc blocks 71. The pawls 74 correspond to the limiting blocks 79 one by one. The end of the pawl 74 is rotatably connected to the surface of the limiting block 79 facing the ratchet 73. The fifth elastic member 78 can be a tension spring or a torsion spring. In the embodiment of the present application, the fifth elastic member 78 is a torsion spring and has a certain deformation ability. One end in the direction of the elastic force of the fifth elastic member 78 is connected to the rotating shaft of the pawl 74, and the other end in the direction of the elastic force of the fifth elastic member 78 is connected to the surface of the limiting block 79. The fifth elastic member 78 has an elastic force to drive the pawl 74 to rotate towards the direction close to the ratchet 73. The end of the pawl 74 is embedded in the tooth ring of the ratchet 73 to achieve meshing, and limits the tendency of the connecting rod 72 to rotate away from the power portion 62.

[0037] Refer to Figure 3 and Figure 4, the materials of the active piston 76 and the driven piston 75 can be rubber or silica gel. In the embodiment of the present application, the materials of both the active piston 76 and the driven piston 75 are rubber, having a certain deformation ability; the active piston 76 corresponds to the limiting arc block 71 one by one. An active flow channel 712 for the active piston 76 to slide is provided on the inner arc surface of the limiting arc block 71. The sliding direction of the active piston 76 and the sliding direction of the limiting arc block 71 are parallel to each other. The first elastic member 77 can be a compression spring or a tension spring. In the embodiment of the present application, the first elastic member 77 is a compression spring, having a certain deformation ability. One end in the direction of the elastic force of the first elastic member 77 is connected to the inner wall of the active flow channel 712, and the other end in the direction of the elastic force of the first elastic member 77 is connected to the surface of the active piston 76. The first elastic member 77 has an elastic force to drive the active piston 76 to slide away from the active flow channel 712, and there is a tendency for the end of the active piston 76 to protrude from the inner arc surface of the limiting arc block 71.

[0038] Referring to Figure 3 and Figure 4 , the driven piston 75 corresponds to the limiting block 79 one by one. A driven flow channel 713 for the driven piston 75 to slide is provided on the inner wall of the limiting cavity 711 away from the power part 62. The end of the driven piston 75 protruding from the inner wall of the limiting cavity 711 is fixed to the surface of the limiting block 79. The driven piston 75 is located on the side of the limiting block 79 away from the power part 62. The driven flow channel 713 communicates with the active flow channel 712. When the elastic force of the first elastic member 77 drives the active piston 76 to slide away from the active flow channel 712 and the end of the active piston 76 protrudes from the inner arc surface of the limiting arc block 71, the air in the driven flow channel 713 enters the active flow channel 712. The external standard atmospheric pressure pushes the limiting block 79 and drives the limiting block 79 to approach the driven flow channel 713, driving the driven piston 75 away from the limiting cavity 711, and the end face of the driven piston 75 connected to the limiting block 79 is flush with the inner wall of the limiting cavity 711, and the end of the pawl 74 disengages from the tooth ring of the ratchet wheel 73, so that the limiting effect of the pawl 74 on the rotation of the connecting rod 72 disappears. When driving the power part 62 to slide along the inner wall of the power cavity 611 away from the hollow pile 10, the connecting rod 72 receives the power of the power part 62 and drives the limiting arc block 71 to slide along the limiting groove 613 towards the axis of the hollow pile 10. The outer peripheral surface of the hollow pile 10 abuts against the end face of the active piston 76 and drives the active piston 76 to approach the active flow channel 712. The end face of the active piston 76 is flush with the inner arc surface of the limiting arc block 71, and the inner arc surface of the limiting arc block 71 abuts tightly against the outer peripheral surface of the hollow pile 10 to form a limit. At the same time, the air in the active flow channel 712 enters the driven flow channel 713 and impacts the surface of the driven piston 75, driving the driven piston 75 to approach the limiting cavity 711 along the driven flow channel 713, driving the limiting block 79 to slide along the inner wall of the limiting cavity 711 towards the power part 62. The end of the pawl 74 is embedded in the tooth ring of the ratchet wheel 73 and achieves meshing, limiting the connecting rod 72 to rotate away from the power part 62, thereby increasing the abutting force between the inner arc surface of the limiting arc block 71 and the outer peripheral surface of the hollow pile 10.

[0039] Referring to Figure 3 and Figure 4 , adjusting components 8 are installed on the limiting arc blocks 71. The adjusting components 8 can control the sliding of the driven piston 75. The adjusting components 8 include an adjusting plate 81, an adjusting piston 82, a second elastic member 83 and a third elastic member 84. The material of the adjusting piston 82 can be rubber or silica gel. In the embodiment of the present application, the material of the adjusting piston 82 is rubber, which has a certain deformation ability. An adjusting flow channel 714 for the adjusting piston 82 to slide is provided on the end face of the limiting arc block 71 away from the connecting rod 72. The sliding direction of the adjusting piston 82 is parallel to the axis of the positioning portion 61, and the adjusting flow channel 714 communicates with the active flow channel 712 and the driven flow channel 713. The second elastic member 83 can be a compression spring or a tension spring. In the embodiment of the present application, the second elastic member 83 is a compression spring, which has a certain deformation ability. The elastic coefficient of the second elastic member 83 is less than the elastic coefficient of the first elastic member 77. One end of the second elastic member 83 in the direction of its elastic force is connected to the inner wall of the adjusting flow channel 714, and the other end of the second elastic member 83 in the direction of its elastic force is connected to the surface of the adjusting piston 82. The second elastic member 83 has an elastic force to drive the adjusting piston 82 to slide in a direction away from the adjusting flow channel 714, and a tendency for the end of the adjusting piston 82 to protrude from the surface of the limiting arc block 71.

[0040] Referring to Figure 3 and Figure 4 , an adjusting cavity 715 for the adjusting plate 81 to slide is provided on the inner wall of the adjusting flow channel 714. The sliding direction of the adjusting plate 81 is parallel to the sliding direction of the limiting block 79. When the adjusting piston 82 is driven to slide along the adjusting flow channel 714 towards the limiting arc block 71, the end face of the adjusting piston 82 is flush with the inner wall of the adjusting cavity 715, and the adjusting plate 81 is pushed to approach the adjusting flow channel 714 along the inner wall of the adjusting cavity 7I5. The plate surface of the adjusting plate 81 abuts against the inner wall of the adjusting cavity 715 and closes the adjusting cavity 715, and the end face of the adjusting piston 82 abuts against the plate surface of the adjusting plate 81 to form a limit, so that the adjusting piston 82 is not easily offset on the inner wall of the adjusting flow channel 714, thereby improving the limiting stability of the adjusting piston 82 on the inner wall of the adjusting flow channel 714.

[0041] Referring to Figure 3 and Figure 4 , the third elastic member 84 can be a compression spring or a tension spring. In the embodiment of the present application, the third elastic member 84 is a compression spring, which has a certain deformation ability. One end of the third elastic member 84 in the direction of its elastic force is connected to the plate surface of the adjusting plate 81, and the other end of the third elastic member 84 in the direction of its elastic force is connected to the inner wall of the adjusting cavity 715. The third elastic member 84 has an elastic force to drive the adjusting plate 81 to slide in a direction towards the adjusting flow channel 714. The plate surface of the adjusting plate 81 abuts against the inner wall of the adjusting cavity 715 and closes the adjusting flow channel 714, and there is a tendency for the plate surface of the adjusting plate 81 to abut against the end face of the adjusting piston 82 to form a limit.

[0042] Referring to Figure 3 and Figure 4, when the inspection of the pile length of the hollow pile 10 is completed, the adjusting plate 81 is driven to overcome the elastic force of the third elastic member 84 and slide away from the adjusting flow channel 714. The closing effect of the adjusting plate 81 on the adjusting flow channel 714 disappears. The elastic force of the second elastic member 83 drives the adjusting piston 82 to slide away from the adjusting flow channel 714. The end of the adjusting piston 82 protrudes from the end face of the limiting arc block 71. The air pressure in the adjusting flow channel 714 decreases, and the air in the driven flow channel 713 enters the adjusting flow channel 714. The external standard atmospheric pressure presses the limiting block 79 and drives the limiting block 79 to slide along the inner wall of the limiting cavity 711 away from the connecting rod 72. The end face of the driven piston 75 connected to the limiting block 79 is flush with the inner wall of the limiting cavity 711, and the end of the pawl 74 disengages from the tooth ring of the ratchet wheel 73, so that the limiting effect of the pawl 74 on the rotation of the connecting rod 72 disappears. The power part 62 is pushed to slide along the inner wall of the power cavity 611 towards the hollow pile 10. The connecting rod 72 receives the power of the power part 62 and drives the limiting arc block 71 to slide along the inner wall of the limiting groove 613 away from the axis of the hollow pile 10. The pressing effect of the outer peripheral surface of the hollow pile 10 on the active piston 76 disappears. And the elastic coefficient of the second elastic member 83 is smaller than that of the first elastic member 77. The elastic force of the first elastic member 77 drives the active piston 76 to slide along the inner wall of the active flow channel 712 away from the limiting arc block 71. The end of the active piston 76 protrudes from the inner arc surface of the limiting arc block 71. At the same time, the air pressure in the active flow channel 712 decreases, and the air in the adjusting flow channel 714 enters the active flow channel 712. The external standard atmospheric pressure drives the adjusting piston 82 to slide along the inner wall of the adjusting flow channel 714 towards the limiting arc block 71. The end face of the adjusting piston 82 is flush with the inner wall of the adjusting cavity 715. The elastic force of the third elastic member 84 drives the adjusting plate 81 to slide along the inner wall of the adjusting cavity 715 towards the adjusting flow channel 714. The plate surface of the adjusting plate 81 presses against the inner wall of the adjusting cavity 715 and closes the adjusting flow channel 714. And the plate surface of the adjusting plate 81 abuts against the end face of the adjusting piston 82 to form a limit, realizing the automatic reset of the adjusting piston 82.

[0043] Refer to Figure 5 and Figure 6, a pile connection detection component 9 is installed on the detection block 4, and the pile connection detection component 9 can detect the quality of the pile connection on the inner cavity wall of the hollow pile 10; the pile connection detection component 9 includes a plurality of detection rods 91, a plurality of fourth elastic members 92, a plurality of rollers 93, a plurality of electromagnets 94, a plurality of magnetic blocks 95 and a plurality of rotational speed sensors 96. A plurality of detection cavities 41 for the detection rods 91 to rotate are spaced apart on the outer peripheral surface of the detection block 4 away from the cable 3. The rotation axis of the detection rod 91 is perpendicular to the axis of the hollow pile 10. The rollers 93 correspond to the detection rods 91 one by one and are rotatably connected to the surface of the detection rod 91 away from the detection block 4, and the axis of the roller 93 is parallel to the rotation axis of the detection rod 91. The fourth elastic member 92 can be a tension spring or a torsion spring. In the embodiment of the present application, the fourth elastic member 92 is a torsion spring and has a certain deformation ability. The fourth elastic members 92 correspond to the detection rods 91 one by one. One end of the elastic force direction of the fourth elastic member 92 is connected to the inner wall of the detection cavity 41, and the other end of the elastic force direction of the fourth elastic member 92 is connected to the rotation shaft of the detection rod 91. The fourth elastic member 92 has an elastic force to drive the detection rod 91 to rotate away from the detection cavity 41, and there is a tendency for the wheel surface of the roller 93 to rollingly contact the inner cavity wall of the hollow pile 10.

[0044] Referring to Figure 5 and Figure 6 , the rotational speed sensors 96 correspond to the detection rods 91 one by one and are connected to the surface of the detection rod 91 facing the roller 93. The rotational speed sensors 96 are electrically connected to the detection instrument 2. The rotational speed sensors 96 can detect the rotational speed of the roller 93 in real time and send the measured value to the detection instrument 2; the magnetic force of the electromagnet 94 is greater than the elastic force of the fourth elastic member 92. The electromagnets 94 correspond to the detection cavities 41 one by one and are embedded. The magnetic blocks 95 correspond to the detection rods 91 one by one and are embedded in the surface of the detection rod 91 facing the electromagnet 94. The detection instrument 2 is electrically connected to the plurality of electromagnets 94; when the detection instrument 2 controls the electromagnet 94 to be energized and have magnetic force, the electromagnet 94 and the magnetic block 95 attract each other with opposite poles and drive the detection rod 91 to rotate towards the detection cavity 41 and be embedded, realizing the storage of the detection rod 91 on the detection block 4, reducing the wear between the roller 93 and the inner cavity wall of the hollow pile 10, thereby prolonging the service life of the detection device; when the detection block 4 penetrates through the inner cavity of the hollow pile 10, the detection instrument 2 controls the electromagnet 94 to be de-energized and lose magnetic force, and the elastic force of the fourth elastic member 92 drives the detection rod 91 to rotate away from the detection cavity 41. The wheel surface of the roller 93 abuts against the inner cavity wall of the hollow pile 10. The winch 1 rotates, driving the cable 3 to pull the detection block 4 close to the positioning portion 61. The wheel surface of the roller 93 rollingly contacts the inner cavity wall of the hollow pile 10. The rotational speed sensor 96 monitors the rotation of the roller 93 in real time and sends the value to the detection instrument 2. When the pile connection position is broken, the rotational speed of the roller 93 is slowed down, enabling the staff to directly judge the quality of the pile joint position according to the change in the rotational speed of the roller 93 in the detection instrument 2, thereby improving the accuracy of the pile connection quality detection.

[0045] The implementation principle of the prestressed concrete hollow pile length and pile joint quality detection device in the embodiment of the present application is as follows: When detecting the length of the hollow pile 10, the cable 3 passes through the limiting hole 612 and the positioning hole 621 in sequence and is connected to the detection block 4. The inner wall of the limiting hole 612 abuts against the surface of the cable 3 and drives the surface of the cable 3 to abut against the detection end of the wheel disc counter 5. The positioning part 61 is placed at the pile head of the hollow pile 10, and the driving part 62 is driven to slide along the inner wall of the power cavity 611 in a direction away from the hollow pile 10. The connecting rod 72 receives the power of the driving part 62 and drives the limiting arc block 71 to slide along the limiting groove 613 in a direction close to the axis of the hollow pile 10. The outer peripheral surface of the hollow pile 10 abuts against the end surface of the active piston 76 and drives the active piston 76 to approach the active flow channel 712. The end surface of the active piston 76 is flush with the inner arc surface of the limiting arc block 71, and the inner arc surface of the limiting arc block 71 tightly abuts against the outer peripheral surface of the hollow pile 10 to form a limit. At the same time, the air in the active flow channel 712 enters the driven flow channel 713 and impacts the surface of the driven piston 75, driving the driven piston 75 to approach the limiting cavity 711 along the driven flow channel 713, driving the limiting block 79 to slide along the inner wall of the limiting cavity 711 in a direction close to the driving part 62. The end of the pawl 74 is embedded in the tooth ring of the ratchet 73 to achieve meshing, and the limiting connecting rod 72 rotates in a direction away from the driving part 62, thereby increasing the tightening force between the inner arc surface of the limiting arc block 71 and the outer peripheral surface of the hollow pile 10. The gravity of the detection block 4 drives the cable to pass through the inner cavity of the hollow pile 10, and the cable 3 between the detection block 4 and the detection instrument 2 is in a taut state. The detection instrument 2 controls the electromagnet 94 to cut off the power and lose magnetism, and the elastic member four 92 elastically drives the detection rod 91 to rotate in a direction away from the detection cavity 41. The wheel surface of the roller 93 abuts against the inner cavity wall of the hollow pile 10. The user rotates the rotating shaft of the winch 1, driving the cable 3 to wind around the outer peripheral surface of the rotating shaft of the winch 1, driving the cable 3 to overcome the gravity of the detection block 4 and approach the positioning hole 621 along the inner cavity of the moving pile. When the end surface of the detection block 4 abuts against the surface of the positioning part 61 facing the hollow pile 10, the pulling stops. The wheel disc counter 5 sends the number of rotation turns to the detection instrument 2, and the detection instrument 2 multiplies the number of turns of the wheel disc counter 5 by the wheel disc circumference to obtain the pile length, realizing the accurate measurement of the pile length, thereby improving the detection efficiency of the pile length; at the same time, the rotation speed sensor 96 monitors the rotation of the roller 93 in real time and sends the value to the detection instrument 2. When the pile joint position is broken, the rotation speed of the roller 93 is slowed down, enabling the staff to directly judge the quality of the pile joint position according to the change in the rotation speed of the roller 93 in the detection instrument 2, thereby improving the detection accuracy of the pile joint quality.

[0046] The embodiment of the present application also discloses a method for detecting the length and pile joint quality of prestressed concrete hollow piles, which uses the prestressed concrete hollow pile length and pile joint quality detection device, and includes the following steps: Installation of the cable 3. The end of the cable 3 passes through the limiting hole 612 and the positioning hole 621 in sequence and is installed on the surface of the detection block 4, and the surface of the cable 3 abuts against the detection end of the wheel disc counter 5 to form a limit; Install the positioning plate 6. Place the surface of the positioning plate 6 on the pile head of the hollow pile 10. The limiting component 7 limits the positioning plate 6 to the pile head of the hollow pile 10, and the detection block 4 is located inside the hollow pile 10. Place the cable 3. The cable 3 penetrates through the hollow pile 10 under the pressure of the detection block 4, and the cable 3 between the detection block 4 and the detection instrument 2 is in a taut state. Pile length detection: Pull the cable 3 to drive the detection block 4 to approach the positioning plate 6. The dial counter 5 sends the value to the detection instrument 2, and the detection instrument 2 multiplies the value by the circumference of the dial to obtain the pile length.

[0047] The implementation principle of the method for detecting the length and pile connection quality of a prestressed concrete hollow pile in an embodiment of the present application is as follows: The gravity of the detection block 4 drives the cable to pass through the inner cavity of the hollow pile 10, and the cable 3 between the detection block 4 and the detection instrument 2 is in a taut state. The staff pulls the cable 3 to drive the cable 3 to overcome the gravity of the detection block 4 and slide along the inner cavity of the hollow pile 10 towards the direction close to the positioning hole 621. When the end face of the detection block 4 abuts against the surface of the positioning plate 6 facing the hollow pile 10, stop pulling. The detection instrument 2 multiplies the number of turns of the dial counter 5 by the circumference of the dial to obtain the pile length, realizing the accurate measurement of the pile length, thereby improving the detection efficiency of the pile length.

[0048] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. Prestressed concrete hollow pile length and joint pile quality detection device, characterized in that: It includes a detection instrument (2), a cable (3), a detection block (4), a dial counter (5), a positioning plate (6) and a limiting component (7). The limiting component (7) is connected to the positioning plate (6), and the limiting component (7) can limit the positioning plate (6) on the head of the hollow pile (10). One end of the cable (3) is connected to the detection instrument (2), and the other end of the cable (3) is connected to the detection block (4). The dial counter (5) is connected to the surface of the positioning plate (6), and the dial counter (5) is electrically connected to the detection instrument (2). A positioning hole (621) for the cable (3) to pass through is formed on the surface of the positioning plate (6), and the positioning hole (621) communicates with the inner cavity of the hollow pile (10). A limiting hole (612) for the cable (3) to pass through is formed on the surface of the positioning plate (6) near the detection end of the dial counter (5). When the end of the cable (3) with the detection block (4) passes through the limiting hole (612) and the positioning hole (621) in sequence and is embedded into the inner cavity of the hollow pile (10), the surface of the cable (3) abuts against the detection end of the dial counter (5). The gravity of the detection block (4) drives the cable to pass through the inner cavity of the hollow pile (10), and the cable (3) between the detection block (4) and the detection instrument (2) is in a taut state.

2. The prestressed concrete hollow pile length and joint quality detection device according to claim 1, characterized in that: The limiting component (7) includes a plurality of limiting arc blocks (71). A plurality of limiting grooves (613) for the limiting arc blocks (71) to slide are formed on the surface of the positioning plate (6) at intervals around the axis of the positioning plate (6). When the plurality of limiting arc blocks (71) slide along the inner wall of the limiting groove (613) towards the direction close to the axis of the positioning plate (6), the inner arc surface of the limiting arc block (71) abuts against the outer peripheral surface of the hollow pile (10) to form a limit.

3. The prestressed concrete hollow pile length and joint quality detection device according to claim 2, characterized in that: The positioning plate (6) includes a positioning part (61) and a power part (62). A power cavity (611) for the power part (62) to slide is coaxially formed on the surface of the positioning part (61), and the power cavity (611) penetrates through the outer wall of the positioning part (61). The limiting groove (613) and the limiting hole (612) are located on the positioning part (61), and the positioning hole (621) is located on the power part (62). The limiting component (7) further includes a plurality of connecting rods (72). The connecting rods (72) correspond to the limiting arc blocks (71) one by one. One end of the connecting rod (72) is rotatably connected to the surface of the limiting arc block (71), and the other end of the connecting rod (72) is rotatably connected to the surface of the power part (62). The connecting rod (72) receives the power of the power part (62) and drives the limiting arc block (71) to slide on the inner wall of the limiting groove (613).

4. The prestressed concrete hollow pile length and joint quality detection device according to claim 3, characterized in that: The limiting component (7) further includes a plurality of ratchets (73), a plurality of pawls (74) and a plurality of limiting blocks (79). The ratchets (73) correspond to the connecting rods (72) one by one. The ratchets (73) are coaxially connected to the rotating shafts of the connecting rods (72) located on the limiting arc block (71). The limiting blocks (79) correspond to the limiting arc block (71) one by one. A limiting cavity (711) for the limiting block (79) to slide is formed on the surface of the limiting arc block (71). The pawls (74) correspond to the limiting blocks (79) one by one. The pawls (74) are rotatably connected to the surface of the limiting block (79) facing the ratchet (73). When the limiting block (79) approaches the ratchet (73) along the inner wall of the limiting cavity (711), the end of the pawl (74) is embedded into the tooth ring of the ratchet (73) to achieve engagement, and the rotation of the connecting rod (72) in the direction away from the power unit (62) is limited.

5. The prestressed concrete hollow pile length and pile splicing quality detection device according to claim 4, characterized in that: The limiting component (7) further includes a plurality of driven pistons (75), a plurality of driving pistons (76) and a plurality of first elastic members (77). The driving pistons (76) correspond to the limiting arc block (71) one by one. A driving flow channel (712) for the driving piston (76) to slide is formed on the inner arc surface of the limiting arc block (71). The sliding direction of the driving piston (76) is parallel to the sliding direction of the limiting block (79). The first elastic members (77) correspond to the driving pistons (76) one by one. One end of the first elastic member (77) in the direction of the elastic force is connected to the surface of the driving piston (76), and the other end of the first elastic member (77) in the direction of the elastic force is connected to the inner wall of the driving flow channel (712). The first elastic member (77) has an elastic force to drive the driving piston (76) to slide in the direction away from the driving flow channel (712), and the end of the driving piston (76) has a tendency to protrude from the inner arc surface of the limiting arc block (71). The driven pistons (75) correspond to the limiting blocks (79) one by one. The end of the driven piston (75) is connected to the side of the limiting block (79) away from the connecting rod (72). A driven flow channel (713) for the driven piston (75) to slide is formed on the inner wall of the limiting cavity (711). The driving flow channel (712) communicates with the driven flow channel (713). When the limiting arc block (71) approaches the axis of the positioning portion (61) along the inner wall of the limiting groove (613), the outer peripheral surface of the hollow pile (10) abuts against the end of the driving piston (76) and drives the driving piston (76) to approach the driving flow channel (712). The end surface of the driving piston (76) is flush with the inner arc surface of the limiting arc block (71). The air in the driving flow channel (712) enters the driven flow channel (713) to impact the surface of the driven piston (75). The limiting block (79) approaches the ratchet (73) along the inner wall of the limiting cavity (711), and the end of the pawl (74) is embedded into the tooth ring of the ratchet (73) to achieve engagement.

6. The prestressed concrete hollow pile length and pile splicing quality detection device according to claim 5, characterized in that: The limiting arc block (71) is connected with an adjusting assembly (8). The adjusting assembly (8) includes an adjusting plate (81), an adjusting piston (82) and a second elastic member (83). An adjusting flow channel (714) for the adjusting piston (82) to slide is formed on the end face of the limiting arc block (71) away from the connecting rod (72). The sliding direction of the adjusting piston (82) is parallel to the axis of the positioning portion (61). The adjusting flow channel (714) communicates with the active flow channel (712) and the driven flow channel (713). The elastic coefficient of the second elastic member (83) is less than that of the first elastic member (77). One end in the elastic force direction of the second elastic member (83) is connected to the inner wall of the adjusting flow channel (714), and the other end in the elastic force direction of the second elastic member (83) is connected to the surface of the adjusting piston (82). The second elastic member (83) has an elastic force to drive the adjusting piston (82) to slide in a direction away from the adjusting flow channel (714), and there is a tendency for the end of the adjusting piston (82) to protrude from the surface of the limiting arc block (71). An adjusting cavity (715) for the adjusting plate (81) to slide is formed on the inner wall of the adjusting flow channel (714). The sliding direction of the adjusting plate (81) is parallel to the sliding direction of the active piston (76). When the adjusting piston (82) is driven to slide in a direction close to the active flow channel (712) and the end of the adjusting piston (82) is flush with the bottom wall of the adjusting cavity (715), the adjusting plate (81) is driven to slide along the inner wall of the adjusting cavity (715) in a direction close to the adjusting flow channel (714). The plate surface of the adjusting plate (81) abuts against the inner wall of the adjusting cavity (715) and closes the adjusting flow channel (714), and the plate surface of the adjusting plate (81) abuts against the end face of the adjusting piston (82) to form a limit.

7. The prestressed concrete hollow pile length and joint quality detection device according to claim 6, characterized in that: The adjusting assembly (8) further includes a third elastic member (84). One end in the elastic force direction of the third elastic member (84) is connected to the end face of the adjusting plate (81), and the other end in the elastic force direction of the third elastic member (84) is connected to the inner wall of the adjusting cavity (715). The third elastic member (84) has an elastic force to drive the adjusting plate (81) to slide in a direction close to the adjusting flow channel (714). The plate surface of the adjusting plate (81) abuts against the inner wall of the adjusting cavity (715) and closes the adjusting flow channel (714), and there is a tendency for the plate surface of the adjusting plate (81) to abut against the end face of the adjusting piston (82) to form a limit.

8. The prestressed concrete hollow pile length and joint quality detection device according to claim 1, characterized in that: The detection block (4) is connected with a pile splicing detection component (9). The pile splicing detection component (9) includes a plurality of detection rods (91), a plurality of fourth elastic members (92), a plurality of rollers (93) and a plurality of rotational speed sensors (96). A plurality of detection cavities (41) for the rotation of the detection rods (91) are spaced apart on the outer peripheral surface of the detection block (4). The rotation axis of the detection rod (91) is perpendicular to the axis of the hollow pile (10). The rollers (93) are in one-to-one correspondence with the detection rods (91) and are rotatably connected to the surface of the detection rod (91) far from the detection block (4). One end of the fourth elastic member (92) in the direction of the elastic force is connected to the inner wall of the detection cavity (41), and the other end of the fourth elastic member (92) in the direction of the elastic force is connected to the rotation shaft of the detection rod (91). The fourth elastic member (92) has an elastic force to drive the detection rod (91) to rotate away from the detection cavity (41). The roller surface of the roller (93) has a tendency to rollingly contact the inner cavity wall of the hollow pile (10). The rotational speed sensors (96) are in one-to-one correspondence with the detection rods (91) and are connected to the surface of the detection rod (91) close to the roller (93). The rotational speed sensors (96) are electrically connected to the detection instrument (2). The rotational speed sensors (96) can detect the rotational speed of the rollers (93) and send the measured value to the detection instrument (2).

9. The prestressed concrete hollow pile length and joint quality detection device according to claim 8, characterized in that: The pile splicing detection component (9) further includes a plurality of electromagnets (94) and a plurality of magnetic blocks (95). The magnetic force of the electromagnets (94) is greater than the elastic force of the fourth elastic members (92). The electromagnets (94) are in one-to-one correspondence with the detection cavities (41) and are embedded therein. The magnetic blocks (95) are in one-to-one correspondence with the detection rods (91) and are connected to the surface of the detection rod (91) facing the detection cavity (41). The electromagnets (94) are electrically connected to the detection instrument (2). The detection instrument (2) can control the energization of the electromagnets (94). When the electromagnets (94) are energized and have magnetic force, the electromagnets (94) and the magnetic blocks (95) attract each other with opposite polarities and drive the detection rods (91) to rotate towards the detection cavity (41) and be embedded therein.

10. Detection method for the length and joint quality of prestressed concrete hollow piles, characterized in that: When using the prestressed concrete hollow pile length and pile splicing quality detection device according to any one of claims 1-9, the following steps are included: Installation of the cable (3). The end of the cable (3) sequentially passes through the limiting hole (612) and the positioning hole (621) and is installed on the surface of the detection block (4), and the surface of the cable (3) abuts against the detection end of the dial counter (5) to form a limit; Installation of the positioning plate (6). The plate surface of the positioning plate (6) is placed on the pile head of the hollow pile (10). The limiting component (7) limits the positioning plate (6) to the pile head of the hollow pile (10), and the detection block (4) is located inside the hollow pile (10); Placement of the cable (3). The cable (3) penetrates through the hollow pile (10) under the pressure of the detection block (4), and the cable (3) between the detection block (4) and the detection instrument (2) is in a taut state; Pile length detection. Pull the cable (3) to drive the detection block (4) to approach the positioning plate (6). The dial counter (5) sends the value to the detection instrument (2), and the detection instrument (2) multiplies the value by the circumferential length of the dial to obtain the pile length.

Images