Auxiliary hole cleaning equipment and method for cast-in-situ bored pile

Abstract

The invention relates to the technical field of drilling construction, in particular to auxiliary hole cleaning equipment and method for a cast-in-situ bored pile, the auxiliary hole cleaning equipment comprises a probing pipe and further comprises a rotating pipe rotationally connected to the bottom of the probing pipe and a hole expanding ring, the surface of the probing pipe and the surface of the rotating pipe are sleeved with the hole expanding ring, and a plugging block is arranged below a sealing ring; the top of the plugging block is fixedly connected with a circular rod, and the top end of the circular rod extends to the position above the sealing ring from the interior of the sealing ring and then is fixedly connected with a plurality of fixing strips. When slurry and sand in a drilled hole are pumped and cleaned, the inner wall of the drilled hole is expanded through the hole expanding ring, the hole diameter of the drilled hole is prevented from being changed while mud cakes are formed on the hole wall, the grouting effect of the cast-in-place pile is guaranteed, the attachment stability of the mud cakes on the expanded hole wall is improved through rotating contact between the rotating pipe and sprayed slurry, and the grouting effect of the cast-in-place pile is improved. And the flowing deposition of the mud is reduced, so that the effect after mud cake formation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling construction, and particularly relates to an auxiliary hole cleaning device and method for bored cast-in-place piles. Background Art

[0002] A bored cast-in-place pile refers to a pile formed by means of mechanical drilling, steel pipe soil extrusion or manual excavation on the construction site in the foundation soil, and a steel reinforcement cage is placed therein and concrete is poured. According to different hole-forming methods, cast-in-place piles can be divided into several categories such as driven cast-in-place piles, bored cast-in-place piles and dug cast-in-place piles.

[0003] The patent document with the publication number CN115012416B discloses a hole cleaning device for bored cast-in-place piles, which includes a sand and gravel pump movably installed above the pile hole. The bottom of the sand and gravel pump is communicated with a pump pipe extending into the pile hole, the top of the sand and gravel pump is communicated with a slag discharge pipe, and a recovery mechanism is provided at one end of the slag discharge pipe away from the sand and gravel pump. The recovery mechanism includes a recovery tank, and a screening component for screening slurry and stone slag is provided in the recovery tank.

[0004] When the existing hole cleaning equipment works, it usually pumps the slurry in the drill hole and then sprays it back on the hole wall. After the slurry sprayed on the hole wall surface solidifies, it will cause the thickness of the hole wall to increase, resulting in the reduction of the drill hole diameter and affecting the pouring specification of the cast-in-place pile. Since the slurry itself has a certain fluidity, it is difficult to ensure that the slurry can stably adhere to the hole wall by spraying. Under the action of gravity, the slurry flows downward along the hole wall, resulting in the accumulation of slurry at the bottom of the drill hole. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies in the prior art and propose an auxiliary hole cleaning device and method for bored cast-in-place piles.

[0006] To achieve the above object, the technical solution adopted by the present invention is: an auxiliary hole cleaning device for bored cast-in-place piles, including a probing pipe, and further including: A rotating pipe, the rotating pipe is rotatably connected to the bottom of the probing pipe. The diameters of the rotating pipe and the probing pipe are the same as the inner diameter of the drill hole. A sealing ring is fixedly connected inside the rotating pipe; An expanding hole ring, the expanding hole ring is sleeved on the surfaces of the probing pipe and the rotating pipe. A blocking block is arranged below the sealing ring. The top of the blocking block is fixedly connected with a circular rod. The top end of the circular rod extends from inside the sealing ring to above the sealing ring and is fixedly connected with a plurality of fixing strips. A plurality of moving grooves are formed on the surface of the rotating pipe. One end of the fixing strip extends into the corresponding moving groove and is fixedly connected to the inner wall of the expanding hole ring; A slurry spraying groove, the slurry spraying groove is formed on the rotating pipe and is located inside the expanding hole ring; A pumping assembly for pumping and sucking mud inside a borehole and then refluxing it after filtration; A rotating assembly for driving the rotation of a hole enlarging ring; A lifting assembly for driving the vertical lifting of the hole enlarging ring on a rotating pipe.

[0007] Preferably, a first receiving groove is formed on the rotating pipe. Before the lifting assembly drives the hole enlarging ring to rise, the first receiving groove is located inside the hole enlarging ring. An arc-shaped plate is slidably connected inside the first receiving groove. A connecting strip is fixedly connected to the top of the sealing ring. A limiting sleeve is fixedly connected to one side of the connecting strip. A limiting pin is fixedly connected to the arc-shaped plate. One end of the limiting pin is slidably limited inside the limiting sleeve. A spring is arranged inside the limiting sleeve and is fixedly connected between the limiting pin and the connecting strip. A guiding inclined surface is formed on the top of the arc-shaped plate.

[0008] Preferably, a second receiving groove is formed below the surface of the hole enlarging ring. A mounting frame is slidably connected inside the second receiving groove. A contact roller is rotatably connected inside the mounting frame. A plurality of circular protrusions are fixedly connected to the surface of the contact roller. A first guiding block is fixedly connected to the rotating pipe. A second guiding block is fixedly connected to the lower side of one side of the mounting frame. Both the first guiding block and the second guiding block are located between the mounting frame and the rotating pipe. The first guiding block is located above the second guiding block. Guiding inclined surfaces are formed at the adjacent ends of the first guiding block and the second guiding block.

[0009] Preferably, the pumping assembly includes: A communicating pipe fixedly connected above one side of a probing pipe. One end of the communicating pipe is fixedly connected to a circular shell; A first conveying pipe fixedly connected to the circular shell and arranged opposite to the communicating pipe; A second conveying pipe fixedly connected to the circular shell and located at the bottom of the circular shell; A slurry storage tank arranged on one side of the probing pipe. A vibrating screen is fixedly installed inside the slurry storage tank. A first sand pump and a second sand pump are fixedly installed on the top of the slurry storage tank. A first hose is fixedly connected between the feeding end of the first sand pump and the first conveying pipe. The discharging end of the first sand pump is located above the vibrating screen. A second hose is fixedly connected between the discharging end of the second sand pump and the second conveying pipe. The feeding end of the second sand pump is located inside the slurry storage tank. A conversion assembly is connected to the circular shell and is used for converting the connection between the first conveying pipe and the second conveying pipe.

[0010] Preferably, the conversion assembly includes: A rotating block, which is rotatably connected inside a circular housing. A connecting pipe is fixedly inserted on the rotating block, and both ends of the connecting pipe are in contact with the inner wall arc surface of the circular housing. A swinging air cylinder, which is fixedly installed on the circular housing, and the piston rod of the swinging air cylinder is fixedly connected to the center of one side of the rotating block.

[0011] Preferably, the lifting assembly includes: A first connecting ring, which is fixedly connected to the probing pipe and is located above the reaming ring. A second connecting ring, which is fixedly connected to the top of the reaming ring. A mating ring is rotatably connected to the top of the second connecting ring, and a plurality of connecting pins are fixedly connected to the top of the mating ring. The connecting pins are all slidably inserted on the first connecting ring. A plurality of electric cylinders, which are all fixedly installed on the top of the first connecting ring, and the piston rods of the electric cylinders are fixedly connected to the top of the mating ring.

[0012] Preferably, the rotating assembly includes: An external toothed ring, which is fixedly connected to the surface of the second connecting ring. A motor, which is fixedly installed on the mating ring, and a gear is fixedly connected to the output shaft of the motor. The gear meshes with the external toothed ring.

[0013] Preferably, a flange is fixedly connected to the top end of the probing pipe, and a plurality of positioning holes are circumferentially formed on the flange.

[0014] Preferably, guiding inclined surfaces are provided at the bottom ends of the rotating pipe and the sealing ring, and the guiding inclined surfaces of the rotating pipe and the sealing ring extend correspondingly.

[0015] A hole cleaning method for an auxiliary hole cleaning device of a cast-in-place bored pile, which includes the following steps: Step 1: Fix the top end of the probing pipe on a crane, move the probing pipe into the drilling hole through the crane, and the pumping assembly pumps and sucks the mud and sand in the drilling hole. Step 2: The lifting assembly drives the reaming ring to move upward, the blocking block moves into the sealing ring and blocks the pumping channel at the bottom end of the rotating pipe, and the slurry spraying groove on the rotating pipe is exposed below the reaming ring. Step 3: The crane drives the probing pipe to move in the reverse direction, and continues to pump the filtered mud back into the probing pipe and the rotating pipe through the action of the pumping assembly, and sprays it along the slurry spraying groove to the reaming position of the drilling hole. The rotating assembly drives the reaming ring to rotate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention pumps and cleans the mud and sand inside the drill hole, it reams the inner wall of the drill hole through the reaming ring, and makes the mud fill into the reaming position by the movement and displacement of the reaming ring, forming a mud skin at the hole wall while preventing the change of the drill hole diameter, ensuring the pouring effect of the cast-in-place pile, and making the rotating pipe rotate in contact with the ejected mud, improving the adhesion stability of the mud skin on the reamed hole wall, reducing the flow and sedimentation of the mud, and thus improving the effect after the formation of the mud skin.

[0017] 2. By the elastic stretching action of the spring, the limit pin is extruded, so that one end of the limit pin moves inside the limit sleeve, and thus the arc-shaped plate moves towards the outside of the rotating pipe along the sliding connection of the first receiving groove. When the arc-shaped plate rotates with the rotating pipe, the outer arc surface of the arc-shaped plate elastically extrudes the mud in the reaming area, so that the mud is slightly compacted during the process of forming the mud skin in the reaming area, thereby improving the smoothness of the mud skin surface and reducing the porosity of the mud skin.

[0018] 3. After the contact roller on the mounting frame moves to the outside of the reaming ring and comes into contact with the inner wall of the reaming, when the reaming ring rotates through the rotating assembly, the contact roller revolves with the reaming ring and rotates around the rotating connection of the mounting frame by the contact friction force when contacting the inner wall of the reaming. When the multiple circular protrusions on the surface of the contact roller rotate, multiple circular depressions are formed on the inner wall of the reaming. When the mud is located inside the reaming area, part of the mud enters the circular depressions on the inner wall of the reaming, increasing the contact area and the degree of engagement between the inner wall of the reaming and the mud, and improving the stability of the mud skin after formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present invention; Figure 2 For the present invention Figure 1 is an enlarged schematic diagram of the structure at A in; Figure 3 is a schematic diagram of the cooperation structure of the probe tube, rotating pipe and reaming ring of the present invention; Figure 4 For the present invention Figure 3 is an enlarged schematic diagram of the structure at B in; Figure 5 is a schematic sectional view of the cooperation structure of the probe tube, rotating pipe and reaming ring of the present invention; Figure 6 For the present invention Figure 5 is an enlarged schematic diagram of the structure at C in; Figure 7 For the present invention Figure 6 is an enlarged schematic diagram of the structure at D in; Figure 8 For the present invention Figure 6 is an enlarged schematic diagram of the structure at E in; Figure 9 Schematic cross-sectional view of the first mating structure of the circular housing, rotating block and connecting pipe of the present invention (the connecting pipe is connected to the communicating pipe and the first delivery pipe); Figure 10 Schematic cross-sectional view of the second mating structure of the circular housing, rotating block and connecting pipe of the present invention (the connecting pipe is connected to the communicating pipe and the second delivery pipe).

[0020] In the figure: 1, probing pipe; 2, rotating pipe; 3, sealing ring; 4, reaming ring; 5, plugging block; 6, circular rod; 7, fixing strip; 8, moving groove; 9, grouting groove; 10, first storage groove; 11, arc-shaped plate; 12, connecting strip; 13, limiting sleeve; 14, limiting pin; 15, spring; 16, second storage groove; 17, mounting bracket; 18, contact roller; 19, circular protrusion; 20, first guiding block; 21, second guiding block; 22, communicating pipe; 23, circular housing; 24, first delivery pipe; 25, second delivery pipe; 26, slurry storage tank; 27, vibrating screen; 28, first sand pump; 29, second sand pump; 30, first hose; 31, second hose; 32, rotating block; 33, connecting pipe; 34, swinging cylinder; 35, first connecting ring; 36, second connecting ring; 37, mating ring; 38, connecting pin; 39, electric cylinder; 40, external toothed ring; 41, motor; 42, gear; 43, flange; 44, positioning hole. Detailed implementation manners

[0021] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations.

[0022] As Figures 1 to 10 shown, an auxiliary hole cleaning device for bored cast-in-place piles includes a probing pipe 1, and further includes: A rotating pipe 2, the rotating pipe 2 is rotatably connected to the bottom of the probing pipe 1, the diameters of the rotating pipe 2 and the probing pipe 1 are both the same as the inner diameter of the drill hole, and a sealing ring 3 is fixedly connected inside the rotating pipe 2 (as Figure 6 shown); A reaming ring 4, the reaming ring 4 is sleeved on the surfaces of the probing pipe 1 and the rotating pipe 2, a plugging block 5 is arranged below the sealing ring 3, a circular rod 6 is fixedly connected to the top of the plugging block 5, the top end of the circular rod 6 extends from inside the sealing ring 3 to above the sealing ring 3 and then is fixedly connected with a plurality of fixing strips 7, a plurality of moving grooves 8 are formed on the surface of the rotating pipe 2, and one end of the fixing strip 7 extends into the corresponding moving groove 8 and is fixedly connected to the inner wall of the reaming ring 4; A grouting groove 9, the grouting groove 9 is formed on the rotating pipe 2 and is located inside the reaming ring 4; A pumping assembly, the pumping assembly is used for pumping and sucking the mud inside the drill hole and returning it after filtration; A rotating component for driving the rotation of the reaming ring 4; A lifting component for driving the vertical lifting of the reaming ring 4 on the rotating pipe 2; When the existing hole cleaning equipment is working, it usually pumps and sucks the mud in the drill hole and then sprays it back onto the hole wall. After the mud is sprayed and solidified on the hole wall surface, it will cause an increase in the thickness of the hole wall, resulting in a reduction in the drill hole diameter, affecting the pouring specifications of the cast-in-place pile. Since the mud itself has a certain fluidity, it is difficult to ensure that the mud can stably adhere to the hole wall by spraying. Under the action of gravity, the mud flows downward along the hole wall, causing the mud to accumulate at the bottom of the drill hole; Before cleaning the drill hole, fix the top end of the probe pipe 1 on the crane, and move the probe pipe 1 into the drill hole through the crane. The rotating pipe 2 at the bottom end of the probe pipe 1 first contacts the drill hole. When the probe pipe 1 drives the rotating pipe 2 to move into the drill hole, the pumping component pumps and sucks the mud and sand in the drill hole, so that the mud and sand enter the rotating pipe 2 and the probe pipe 1 along the cavity of the sealing ring 3 and continue to be transported; The diameters of the rotating pipe 2 and the probe pipe 1 are the same as the inner diameter of the drill hole, and the reaming ring 4 is sleeved on the probe pipe 1 and the rotating pipe 2. Thus, when the reaming ring 4 moves synchronously into the drill hole, the reaming ring 4 squeezes and enlarges the inner wall of the drill hole; When the rotating pipe 2 moves to the bottom of the drill hole, the cleaning of the mud and sand in the drill hole is completed. Then, under the action of the lifting component, the reaming ring 4 is driven to move vertically upward along the surfaces of the probe pipe 1 and the rotating pipe 2. During the movement of the reaming ring 4, the reaming ring 4 drives a plurality of fixing bars 7 to move upward inside the movable groove 8, so that the circular rod 6 and the plugging block 5 move upward synchronously. The plugging block 5 moves into the sealing ring 3 and plugs the pumping channel at the bottom end of the rotating pipe 2. And when the reaming ring 4 moves upward, the slurry spraying groove 9 on the rotating pipe 2 is exposed below the reaming ring 4. Then, through the action of the pumping component, the filtered mud is pumped back into the probe pipe 1 and the rotating pipe 2 again and sprayed out along the slurry spraying groove 9 to the reaming position of the drill hole; The crane drives the probe pipe 1 to move reversely in the drill hole. The rotating component drives the reaming ring 4 to rotate. Through the fixation of the reaming ring 4 and the fixing bar 7 and the limitation of the fixing bar 7 inside the movable groove 8, the rotating pipe 2 rotates synchronously with the reaming ring 4, so that the slurry spraying groove 9 continuously rotates and sprays the mud to the reaming area of the drill hole. Through the rotational contact between the rotation of the rotating pipe 2 and the sprayed mud, the mud is kept in a uniformly suspended state in the reaming area of the drill hole, ensuring the effective deposition of fixed particles on the surface of the reamed hole wall. When the rotating pipe 2 rotates, the centrifugal force generated by the rotation of the rotating pipe 2 causes the solid particles in the mud to diffuse towards the reamed hole wall direction, enhancing the contact efficiency between the particles and the reamed hole wall, reducing the flow and deposition of the mud, and improving the formation effect of the mud cake on the hole wall.

[0023] When the present invention pumps and cleans the mud and sand inside the drill hole, the reaming ring 4 is used to ream the inner wall of the drill hole, and the mud is filled into the reamed position by the movement and displacement of the reaming ring 4, forming a mud skin at the hole wall while preventing the change of the drill hole diameter, ensuring the pouring effect of the cast-in-place pile, and rotatingly contacting the rotating pipe 2 with the ejected mud to improve the adhesion stability of the mud skin on the reamed hole wall, reducing the flow and sedimentation of the mud, thereby improving the effect after the formation of the mud skin.

[0024] As a further embodiment of the present invention, a first receiving groove 10 is formed on the rotating pipe 2 (as Figure 7 shown). Before the lifting assembly drives the reaming ring 4 to rise, the first receiving groove 10 is located inside the reaming ring 4. An arc-shaped plate 11 is slidably connected inside the first receiving groove 10. A connecting strip 12 is fixedly connected to the top of the sealing ring 3. A limiting sleeve 13 is fixedly connected to one side of the connecting strip 12. A limiting pin 14 is fixedly connected to the arc-shaped plate 11. One end of the limiting pin 14 is slidably limited inside the limiting sleeve 13. A spring 15 is arranged inside the limiting sleeve 13. The spring 15 is fixedly connected between the limiting pin 14 and the connecting strip 12. A guiding inclined surface is formed at the top of the arc-shaped plate 11; When the reaming ring 4 moves upward under the action of the lifting assembly, the slurry spraying groove 9 on the rotating pipe 2 is exposed below the reaming ring 4. At the same time, when the reaming ring 4 moves above the first receiving groove 10, after the arc-shaped plate 11 loses the limiting extrusion of the inner wall of the reaming ring 4, the limiting pin 14 is extruded by the elastic stretching action of the spring 15, so that one end of the limiting pin 14 moves inside the limiting sleeve 13, thereby enabling the arc-shaped plate 11 to move outward along the sliding connection of the first receiving groove 10 towards the outside of the rotating pipe 2. When the arc-shaped plate 11 rotates with the rotating pipe 2, the outer arc surface of the arc-shaped plate 11 elastically extrudes the mud in the reaming area, so that the mud is slightly compacted during the process of forming the mud skin in the reaming area, thereby improving the smoothness of the mud skin surface and reducing the porosity of the mud skin; When the reaming ring 4 moves downward, the bottom of the reaming ring 4 contacts and extrudes the guiding inclined surface at the top of the arc-shaped plate 11, so that the arc-shaped plate 11 moves reversely along the first receiving groove 10 and returns to the inside of the first receiving groove 10 again, and the spring 15 is extruded to make the spring 15 in an elastically compressed state.

[0025] As a further embodiment of the present invention, a second receiving groove 16 is formed below the surface of the reaming ring 4 (as Figure 8As shown in the figure, an installation frame 17 is slidably connected inside the second storage groove 16. A contact roller 18 is rotatably connected inside the installation frame 17. A plurality of circular protrusions 19 are fixedly connected to the surface of the contact roller 18. A first guiding block 20 is fixedly connected to the rotating pipe 2. A second guiding block 21 is fixedly connected to the lower side of one side of the installation frame 17. Both the first guiding block 20 and the second guiding block 21 are located between the installation frame 17 and the rotating pipe 2. The first guiding block 20 is located above the second guiding block 21. Guiding inclined surfaces are provided at the adjacent ends of the first guiding block 20 and the second guiding block 21. When the reaming ring 4 moves upward under the action of the lifting assembly, the installation frame 17 in the second storage groove 16 moves upward synchronously with the reaming ring 4 and drives the second guiding block 21 to move upward. During the movement of the second guiding block 21, it contacts the first guiding block 20. Through the contact and extrusion of the guiding inclined surfaces on the first guiding block 20 and the second guiding block 21, the second guiding block 21 drives the installation frame 17 to move and make way, so that the installation frame 17 moves outside the reaming ring 4 along the second storage groove 16. After the contact roller 18 on the installation frame 17 moves outside the reaming ring 4, it comes into contact with the reaming inner wall. When the reaming ring 4 rotates through the rotating assembly, the contact roller 18 revolves with the reaming ring 4 and rotates along the rotating connection of the installation frame 17 by contact friction when contacting the reaming inner wall. The plurality of circular protrusions 19 on the surface of the contact roller 18 form a plurality of circular depressions on the reaming inner wall during rotation. When the mud is located inside the reaming area, part of the mud enters the circular depressions on the reaming inner wall, increasing the contact area and the degree of fitting between the reaming inner wall and the mud, and improving the stability after the mud cake is formed. After the reaming ring 4 moves downward under the action of the lifting assembly, the second guiding block 21 moves downward and loses the contact extrusion of the first guiding block 20. When the reaming ring 4 performs the next reaming, the contact roller 18 is squeezed during the reaming process and drives the installation frame 17 to automatically return to the inside of the second storage groove 16, so that the contact roller 18 is reset.

[0026] As a further embodiment of the present invention, the pumping assembly includes: A connecting pipe 22 (as Figure 2 shown), the connecting pipe 22 is fixedly connected above one side of the probing pipe 1, and one end of the connecting pipe 22 is fixedly connected to a circular housing 23; Figure 9 A first conveying pipe 24, the first conveying pipe 24 is fixedly connected to the circular housing 23, and the first conveying pipe 24 is arranged opposite to the connecting pipe 22; A second conveying pipe 25, the second conveying pipe 25 is fixedly connected to the circular housing 23, and the second conveying pipe 25 is located at the bottom of the circular housing 23; The slurry storage tank 26 is arranged on one side of the probing pipe 1. A vibrating screen 27 is fixedly installed inside the slurry storage tank 26. A first sand pump 28 and a second sand pump 29 are fixedly installed on the top of the slurry storage tank 26. A first flexible hose 30 is fixedly connected between the feeding end of the first sand pump 28 and the first conveying pipe 24. The discharging end of the first sand pump 28 is located above the vibrating screen 27. A second flexible hose 31 is fixedly connected between the discharging end of the second sand pump 29 and the second conveying pipe 25. The feeding end of the second sand pump 29 is located in the slurry storage tank 26. A conversion assembly is connected to the circular housing 23. The conversion assembly is used to convert the connection between the first conveying pipe 24 and the second conveying pipe 25; By the operation of the first sand pump 28, the mud and sand in the borehole enter the inside of the rotating pipe 2 and the probing pipe 1, and then enter the first conveying pipe 24 along the connecting pipe 22. Then, they enter the feeding end of the first sand pump 28 through the first flexible hose 30, and are then conveyed to the vibrating screen 27 along the discharging end of the first sand pump 28. Through the operation of the vibrating screen 27, the mud and sand are sieved by the vibrating screen 27, so that the mud enters the slurry storage tank 26 along the sieve holes on the surface of the vibrating screen 27, and the sand and gravel are filtered and separated on the vibrating screen 27; When the rotating pipe 2 moves to the bottom of the borehole and is lifted upward by the crane, the first sand pump 28 stops working, and through the action of the conversion assembly, the connection between the connecting pipe 22 and the first conveying pipe 24 is closed, and the connecting pipe 22 is connected to the second conveying pipe 25. Then, through the operation of the second sand pump 29, the slurry inside the slurry storage tank 26 at the feeding end of the second sand pump 29 is pumped into the second flexible hose 31, and is conveyed to the inside of the connecting pipe 22 along the second conveying pipe 25, and finally re-enters the inside of the rotating pipe 2 and the probing pipe 1 and is ejected from the slurry spraying groove 9.

[0027] As a further implementation of the present invention, the conversion assembly includes: A rotating block 32 (as shown in Figure 9 and Figure 10 ), the rotating block 32 is rotatably connected inside the circular housing 23. A connecting pipe 33 is fixedly inserted on the rotating block 32. Both ends of the connecting pipe 33 are in contact with the inner wall arc surface of the circular housing 23; A swinging cylinder 34 is fixedly installed on the circular housing 23. The piston rod of the swinging cylinder 34 is fixedly connected to the center of one side of the rotating block 32; When both ends of the connecting pipe 33 are respectively connected to the connecting pipe 22 and the first conveying pipe 24, the mud and sand enter the inside of the connecting pipe 33 along the connecting pipe 22 and enter the first conveying pipe 24 along the connecting pipe 33. After the first sand pump 28 stops working, the piston rod of the swinging cylinder 34 rotates to drive the rotating block 32 to rotate inside the circular housing 23, and drives the connecting pipe 33 to rotate synchronously, so that both ends of the connecting pipe 33 are respectively connected to the connecting pipe 22 and the second conveying pipe 25 (as shown inFigure 10 As shown in the figure, the screened slurry enters the inside of the connecting pipe 33 along the second conveying pipe 25, and enters the communicating pipe 22 along the connecting pipe 33, reversely conveying the screened slurry, and closing the communicating passage of the first conveying pipe 24 during the conveying process to prevent the slurry from continuing to move into the first conveying pipe 24.

[0028] As a further embodiment of the present invention, the lifting assembly includes: A first connecting ring 35, which is fixedly connected to the probing pipe 1, and the first connecting ring 35 is located above the reaming ring 4; A second connecting ring 36, which is fixedly connected to the top of the reaming ring 4, a mating ring 37 is rotatably connected to the top of the second connecting ring 36, a plurality of connecting pins 38 are fixedly connected to the top of the mating ring 37, and the connecting pins 38 are all slidably inserted into the first connecting ring 35; A plurality of electric cylinders 39, which are all fixedly installed on the top of the first connecting ring 35, and the piston shafts of the electric cylinders 39 are fixedly connected to the top of the mating ring 37; By synchronously moving the piston shafts of the plurality of electric cylinders 39 upward, the mating ring 37 drives the connecting pins 38 to move upward synchronously, and through the sliding insertion of the connecting pins 38 on the first connecting ring 35, the vertical movement of the mating ring 37 is limited. The second connecting ring 36 is rotatably connected to the bottom of the mating ring 37. Thus, when the mating ring 37 moves upward, the second connecting ring 36 moves upward synchronously with the mating ring 37 and drives the reaming ring 4 to move, so that the reaming ring 4 moves upward along the sleeved portion of the probing pipe 1 and the rotating pipe 2.

[0029] As a further embodiment of the present invention, the rotating assembly includes: An external toothed ring 40, which is fixedly connected to the surface of the second connecting ring 36; A motor 41, which is fixedly installed on the mating ring 37, a gear 42 is fixedly connected to the output shaft of the motor 41, and the gear 42 meshes with the external toothed ring 40; The output shaft of the motor 41 drives the gear 42 to rotate synchronously, and through the meshing action of the gear 42 and the external toothed ring 40, the second connecting ring 36 rotates unidirectionally along the rotating connection of the mating ring 37 and drives the reaming ring 4 to rotate synchronously.

[0030] As a further embodiment of the present invention, a flange 43 is fixedly connected to the top end of the probing pipe 1 (as Figure 2 shown), and a plurality of positioning holes 44 are circumferentially formed in the flange 43; A flange 43 is fixed to the top end of the probing pipe 1, and the probing pipe 1 and the crane are fixedly installed by bolt-fixing the positioning holes 44 on the flange 43 to the lifting end of the crane.

[0031] As a further embodiment of the present invention, guiding inclined surfaces are provided at the bottom ends of the rotating pipe 2 and the sealing ring 3, and the guiding inclined surfaces of the rotating pipe 2 and the sealing ring 3 extend correspondingly; By providing guiding inclined surfaces at the bottom ends of the rotating pipe 2 and the sealing ring 3, when the rotating pipe 2 enters the inside of the drill hole and pumps and sucks mud and sand and gravel, the mud and sand and gravel move along the guiding inclined surfaces at the bottom ends of the rotating pipe 2 and the sealing ring 3 into the cavity of the sealing ring 3, improving the cleaning efficiency of the mud and sand and gravel and reducing the omission and blockage generated during emptying.

[0032] A hole cleaning method for an auxiliary hole cleaning device of a bored cast-in-place pile, the method comprising the following steps: Step 1: Fix the top end of the probing pipe 1 on a crane, move the probing pipe 1 into the drill hole through the crane, and the pumping assembly pumps and sucks the mud and sand and gravel inside the drill hole; Step 2: The lifting assembly drives the reaming ring 4 to move upward, the blocking block 5 moves into the inside of the sealing ring 3 and blocks the pumping channel at the bottom end of the rotating pipe 2, and the slurry spraying groove 9 on the rotating pipe 2 is exposed below the reaming ring 4; Step 3: The crane drives the probing pipe 1 to move in the reverse direction, and continues to pump the filtered mud back into the probing pipe 1 and the rotating pipe 2 through the action of the pumping assembly, and sprays it along the slurry spraying groove 9 to the reamed position of the drill hole, and the rotating assembly drives the reaming ring 4 to rotate.

[0033] Working principle of the present invention: Before cleaning the drill hole, fix the top end of the probing pipe 1 on a crane, move the probing pipe 1 into the drill hole through the crane, the rotating pipe 2 at the bottom end of the probing pipe 1 first contacts the drill hole, and when the probing pipe 1 drives the rotating pipe 2 to move into the drill hole, the pumping assembly pumps and sucks the mud and sand and gravel inside the drill hole, so that the mud and sand and gravel enter the rotating pipe 2 and the probing pipe 1 along the cavity of the sealing ring 3 and continue to be transported; The diameters of the rotating pipe 2 and the probing pipe 1 are the same as the inner diameter of the drill hole, and the reaming ring 4 is sleeved on the probing pipe 1 and the rotating pipe 2, so that when the reaming ring 4 moves into the drill hole synchronously, the reaming ring 4 squeezes and reams the inner wall of the drill hole; When the rotating pipe 2 moves to the bottom of the drill hole, the cleaning of the mud and sand inside the drill hole is completed. Then, under the action of the lifting assembly, the reaming ring 4 is driven to move vertically upward along the surfaces of the probe pipe 1 and the rotating pipe 2. During the movement of the reaming ring 4, a plurality of fixing bars 7 are driven to move upward inside the movable groove 8, so that the circular rod 6 and the plugging block 5 move upward synchronously. The plugging block 5 moves into the sealing ring 3 and plugs the pumping channel at the bottom end of the rotating pipe 2. When the reaming ring 4 moves upward, the slurry spraying groove 9 on the rotating pipe 2 is exposed below the reaming ring 4. Then, through the action of the pumping assembly, the filtered slurry is pumped back into the probe pipe 1 and the rotating pipe 2 again, and is sprayed out along the slurry spraying groove 9 to the reamed position of the drill hole. The crane drives the probe pipe 1 to move in the reverse direction in the drill hole. The rotating assembly drives the reaming ring 4 to rotate. Through the fixation of the reaming ring 4 and the fixing bars 7 and the limitation of the fixing bars 7 inside the movable groove 8, the rotating pipe 2 rotates synchronously with the reaming ring 4, so that the slurry spraying groove 9 rotates continuously and sprays the slurry rotationally to the reamed area of the drill hole, and makes rotational contact with the sprayed slurry through the rotation of the rotating pipe 2, so that the slurry remains in a uniformly suspended state in the reamed area of the drill hole, ensuring the effective deposition of fixed particles on the surface of the reamed hole wall. When the rotating pipe 2 rotates, the centrifugal force generated by the rotation of the rotating pipe 2 causes the solid particles in the slurry to diffuse towards the reamed hole wall, enhancing the contact efficiency between the particles and the reamed hole wall, reducing the flow and siltation of the slurry, and improving the formation effect of the mud cake on the hole wall.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary hole cleaning device for bored cast-in-place piles, including a probing pipe (1), characterized in that, Further comprising: A rotating pipe (2), the rotating pipe (2) is rotatably connected to the bottom of the probing pipe (1), the diameters of the rotating pipe (2) and the probing pipe (1) are the same as the inner diameter of the drilling hole, and a sealing ring (3) is fixedly connected inside the rotating pipe (2); An underreaming ring (4), the underreaming ring (4) is sleeved on the surfaces of the probing pipe (1) and the rotating pipe (2), a plugging block (5) is arranged below the sealing ring (3), a circular rod (6) is fixedly connected to the top of the plugging block (5), the top end of the circular rod (6) extends from inside the sealing ring (3) to above the sealing ring (3) and then is fixedly connected with a plurality of fixing bars (7), a plurality of moving grooves (8) are formed in the surface of the rotating pipe (2), and one end of the fixing bar (7) extends into the corresponding moving groove (8) and is fixedly connected to the inner wall of the underreaming ring (4); A slurry spraying groove (9), the slurry spraying groove (9) is formed in the rotating pipe (2) and located inside the underreaming ring (4); A pumping assembly, the pumping assembly is used for pumping and sucking the slurry inside the drilling hole and refluxing it after filtration; A rotating assembly, the rotating assembly is used for driving the rotation of the underreaming ring (4); A lifting assembly, the lifting assembly is used for driving the vertical lifting of the underreaming ring (4) on the rotating pipe (2).

2. The auxiliary hole cleaning device for bored cast-in-place piles according to claim 1, characterized in that, A first receiving groove (10) is formed in the rotating pipe (2). Before the lifting assembly drives the underreaming ring (4) to rise, the first receiving groove (10) is located inside the underreaming ring (4). An arc-shaped plate (11) is slidably connected inside the first receiving groove (10). A connecting bar (12) is fixedly connected to the top of the sealing ring (3). A limiting sleeve (13) is fixedly connected to one side of the connecting bar (12). A limiting pin (14) is fixedly connected to the arc-shaped plate (11). One end of the limiting pin (14) is slidably limited inside the limiting sleeve (13). A spring (15) is arranged inside the limiting sleeve (13). The spring (15) is fixedly connected between the limiting pin (14) and the connecting bar (12). A guiding inclined surface is formed at the top of the arc-shaped plate (11).

3. An auxiliary hole cleaning device for bored cast-in-place piles according to claim 2, characterized in that, A second receiving groove (16) is formed below the surface of the underreaming ring (4). An installation frame (17) is slidably connected inside the second receiving groove (16). A contact roller (18) is rotatably connected inside the installation frame (17). A plurality of circular protrusions (19) are fixedly connected to the surface of the contact roller (18). A first guiding block (20) is fixedly connected to the rotating pipe (2). A second guiding block (21) is fixedly connected to the lower side of one side of the installation frame (17). Both the first guiding block (20) and the second guiding block (21) are located between the installation frame (17) and the rotating pipe (2). The first guiding block (20) is located above the second guiding block (21). Guiding inclined surfaces are formed at the adjacent ends of the first guiding block (20) and the second guiding block (21).

4. The auxiliary hole cleaning device for bored cast-in-place piles according to claim 1, characterized in that, The pumping assembly includes: A connecting pipe (22), the connecting pipe (22) is fixedly connected above one side of the probing pipe (1), and one end of the connecting pipe (22) is fixedly connected with a circular shell (23); A first conveying pipe (24), the first conveying pipe (24) is fixedly connected to the circular shell (23), and the first conveying pipe (24) is arranged opposite to the connecting pipe (22); A second conveying pipe (25), the second conveying pipe (25) is fixedly connected to the circular shell (23), and the second conveying pipe (25) is located at the bottom of the circular shell (23); A slurry storage tank (26), the slurry storage tank (26) is arranged on one side of the probing pipe (1), a vibrating screen (27) is fixedly installed inside the slurry storage tank (26), a first sand pump (28) and a second sand pump (29) are fixedly installed on the top of the slurry storage tank (26), a first hose (30) is fixedly connected between the feeding end of the first sand pump (28) and the first conveying pipe (24), the discharging end of the first sand pump (28) is located above the vibrating screen (27), a second hose (31) is fixedly connected between the discharging end of the second sand pump (29) and the second conveying pipe (25), the feeding end of the second sand pump (29) is located in the slurry storage tank (26), and a conversion assembly is connected to the circular shell (23), and the conversion assembly is used to convert the connection between the first conveying pipe (24) and the second conveying pipe (25).

5. An auxiliary hole cleaning device for bored cast-in-place piles according to claim 4, characterized in that, The conversion assembly includes: A rotating block (32), the rotating block (32) is rotatably connected inside the circular shell (23), a connecting pipe (33) is fixedly inserted on the rotating block (32), and both ends of the connecting pipe (33) are in contact with the inner wall arc surface of the circular shell (23); A swinging cylinder (34), the swinging cylinder (34) is fixedly installed on the circular shell (23), and the piston shaft of the swinging cylinder (34) is fixedly connected to the center of one side of the rotating block (32).

6. The auxiliary hole cleaning device for bored cast-in-place piles according to claim 1, characterized in that, The lifting assembly includes: A first connecting ring (35), the first connecting ring (35) is fixedly connected to the probing pipe (1), and the first connecting ring (35) is located above the reaming ring (4); A second connecting ring (36), the second connecting ring (36) is fixedly connected to the top of the reaming ring (4), a mating ring (37) is rotatably connected to the top of the second connecting ring (36), a plurality of connecting pins (38) are fixedly connected to the top of the mating ring (37), and the connecting pins (38) are all slidably inserted on the first connecting ring (35); A plurality of electric cylinders (39), the electric cylinders (39) are all fixedly installed on the top of the first connecting ring (35), and the piston shafts of the electric cylinders (39) are fixedly connected to the top of the mating ring (37).

7. An auxiliary hole cleaning device for bored cast-in-place piles according to claim 6, characterized in that, The rotating assembly includes: An external gear ring (40), the external gear ring (40) is fixedly connected to the surface of the second connecting ring (36); A motor (41), the motor (41) is fixedly installed on the mating ring (37), a gear (42) is fixedly connected to the output shaft of the motor (41), and the gear (42) meshes with the external gear ring (40).

8. An auxiliary hole cleaning device for bored cast-in-place piles according to claim 1, characterized in that, The top end of the inserted pipe (1) is fixedly connected with a flange plate (43), and a plurality of positioning holes (44) are circumferentially formed in the flange plate (43).

9. An auxiliary hole cleaning device for bored cast-in-place piles according to claim 1, characterized in that, Guide slopes are provided at the bottom ends of the rotating pipe (2) and the sealing ring (3), and the guide slopes of the rotating pipe (2) and the sealing ring (3) extend correspondingly.

10. A method for cleaning the hole of an auxiliary hole cleaning device for bored cast-in-place piles, applicable to the auxiliary hole cleaning device for bored cast-in-place piles described in any one of claims 1-9, characterized in that, The method comprises the following steps: Step 1: Fix the top end of the inserted pipe (1) on a crane, move the inserted pipe (1) into the borehole through the crane, and the pumping assembly pumps and sucks the mud and sand in the borehole; Step 2: The lifting assembly drives the reaming ring (4) to move upward, the blocking block (5) moves into the sealing ring (3) and blocks the pumping channel at the bottom end of the rotating pipe (2), and the slurry spraying groove (9) on the rotating pipe (2) is exposed below the reaming ring (4); Step 3: The crane drives the inserted pipe (1) to move in the reverse direction, and continues to pump the filtered mud back into the inserted pipe (1) and the rotating pipe (2) through the action of the pumping assembly, and sprays it toward the reamed position of the borehole along the slurry spraying groove (9), and the rotating assembly drives the reaming ring (4) to rotate.

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