A device for removing the excess concrete from the top of a cast-in-place pile and a method for removing the excess concrete from the top of a cast-in-place pile

Abstract

The application discloses a kind of pile top overfilling part of bored pile and its removal method, belong to the technical field of bored pile construction, it includes: cutting base, reinforcing ring around seat, center support frame, slurry cylinder, cutting base is equipped with a plurality of slurry hole, the upper hole of slurry hole is covered with first slurry pad, the bottom surface of cutting base is fixed with cutting plate.The application can remove the overfilling concrete slurry in the pile hole before it hardens, and the removed concrete slurry can be effectively utilized. During operation, the cutting base slowly rotates and descends, transferring the upper layer of concrete slurry in the pile hole to the slurry cylinder above the cutting base. The construction is simple and fast, and the upper steel of the reinforcement cage is pulled out from the reinforcing ring around seat during the operation process, avoiding damage to the reinforcement cage.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of removal device and its removal method of the super-poured part of pile top of bored pile, belong to the technical field of bored pile construction. BACKGROUND

[0002] Concrete bored pile is mainly applied in high-rise building, bridge, road and other infrastructure, and its role is to reinforce soft foundation, improve foundation bearing capacity and stability. Bored pile can adjust aperture and depth according to geological conditions and engineering requirements, has strong adaptability, fast construction speed and strong bearing capacity and other characteristics. In order to compensate for concrete loss, deal with the problem of floating slurry, ensure the concrete strength of pile head, and avoid quality problems caused by uneven concrete pouring or insufficient vibration, the specification stipulates that when pouring reaches the pile top, the concrete above the design elevation should be poured more than 50 cm, and the super-poured pile head needs to be broken later.

[0003] In actual concrete pouring construction of bored pile, except underwater concrete bored pile, most of the bored piles pull out the steel casing immediately after the completion of concrete pouring, and then break the super-poured pile head by artificial or mechanical method after the concrete reaches the specified strength. At present, the construction method of breaking the super-poured pile head after hardening not only consumes time and effort, but also may affect the quality of the steel bars in the pile head, and the hardened concrete cannot be efficiently utilized.

[0004] The device for quickly removing floating slurry of pile head of bored pile disclosed in the patent application with publication number CN114991129A needs the pile top to be above ground and the super-poured concrete to have good fluidity, which cannot be applied to most concrete bored piles in actual engineering, and the fluidity of super-poured concrete cannot be guaranteed. Therefore, how to economically and effectively remove the super-poured concrete of bored pile is an urgent practical construction problem to be solved. SUMMARY

[0005] The present application provides a kind of removal device and its removal method of the super-poured part of pile top of bored pile, which is simple and convenient to construct, the concrete slurry removed can be effectively utilized, and the steel reinforcement cage is not damaged during operation.

[0006] The present application achieves the above-mentioned purposes by adopting the following technical solutions:

[0007] On the one hand, the present application provides a kind of removal device of the super-poured part of pile top of bored pile, which comprises:

[0008] The cutting base is circular and rotatable along the circumferential direction thereof. A plurality of steam holes are formed in the cutting base. The upper hole openings of the steam holes are covered by first steam stopping pads. The front side of the first steam stopping pads relative to the rotating direction is fixed to the front side edges of the upper hole openings of the steam holes, and the other side is freely covered on the side edges of the upper hole openings of the steam holes. The bottom surface of the cutting base is fixed with a plurality of cutting plates corresponding to the steam holes. The rear side of the cutting plates relative to the rotating direction is fixed to the rear side edges of the lower hole openings of the steam holes, and the front side is inclined forward and downward. A cylindrical drill rod connector is fixed to the top center of the cutting base.

[0009] The steel reinforcement surrounding seat is coaxially sleeved on the outside of the cutting base. A steel reinforcement through hole is formed in the steel reinforcement surrounding seat.

[0010] A center support frame is arranged above the cutting base and the steel reinforcement surrounding seat. The center support frame includes a sleeve and a plurality of horizontal rods fixed around the sleeve. The outer ends of the horizontal rods are fixedly connected to the steel reinforcement surrounding seat through vertical rods. The drill rod connector passes through the sleeve.

[0011] A slurry cylinder surrounds the top of the cutting base and the steel reinforcement surrounding seat. The lower cylinder opening of the slurry cylinder is buckled on the outer edge of the steel reinforcement surrounding seat.

[0012] Optionally, a plurality of arc-shaped steel reinforcement through grooves are formed in the steel reinforcement surrounding seat. Second steam stopping pads are covered on the upper groove openings and the lower groove holes of the steel reinforcement through grooves. The steel reinforcement through holes are formed in the second steam stopping pads.

[0013] Optionally, the first steam stopping pads and the second steam stopping pads are made of wire clamping rubber.

[0014] Optionally, a clamp is arranged on the drill rod connector above the sleeve. A first annular shoulder is coaxially arranged on the drill rod connector below the sleeve. A second annular shoulder is coaxially arranged in the middle of the lumen of the sleeve. First and second thrust bearings are respectively sleeved on the drill rod connectors above and below the second annular shoulder. The top and bottom of the first thrust bearing respectively abut against the bottom of the clamp and the top of the second annular shoulder. The top and bottom of the second thrust bearing respectively abut against the bottom of the second annular shoulder and the top of the first annular shoulder.

[0015] Optionally, the removal device of the over-pouring part of the cast-in-place pile top further includes a plurality of steel reinforcement protection sleeves. Each steel reinforcement protection sleeve is used for sleeving on the upper end of the steel reinforcement in the pile hole.

[0016] Optionally, a support rim is arranged around the outer edge of the steel reinforcement surrounding seat. The lower cylinder opening of the slurry cylinder is buckled on the support rim.

[0017] In another aspect, the present application provides a method for removing the over-poured part of the pile top of a cast-in-place pile, using the removal device and comprising the following steps:

[0018] S1. Butting the drill rod of the drilling machine with the drill rod connector, adjusting the perpendicularity of the drill rod and the position of the steel ring surrounding seat, and making the steel perforation align with the steel in the pile hole;

[0019] S2. Controlling the drill rod to drive the removal device to move downward in the pile hole, and making the cutting base descend to the concrete slurry liquid surface in the pile hole;

[0020] S3. Controlling the drill rod to rotate and descend, and making the drill rod drive the cutting base to rotate, cut the concrete slurry, and make the concrete slurry pass through the blowhole after opening the first slurry stop pad to reach above the cutting base;

[0021] S4. After the cutting base descends to the specified height, the drill rod stops rotating, the first slurry stop pad blocks the blowhole, and the concrete slurry is kept in the slurry cylinder;

[0022] S5. Controlling the drill rod to ascend, taking the removal device to the ground, and leaving the pile hole.

[0023] Optionally, the method for removing the over-poured part of the pile top of a cast-in-place pile further comprises the following steps:

[0024] S6. Using the vibration rod to vibrate the upper part of the concrete slurry in the pile hole to make the liquid surface flat.

[0025] Further, step S1 further comprises the operation of sleeving the steel sleeve on the steel, and step S5 further comprises the operation of taking off the steel sleeve from the steel.

[0026] The beneficial effects of the present application include but are not limited to:

[0027] The removal device for the over-poured part of the pile top of a cast-in-place pile and the removal method thereof can remove the over-poured concrete slurry in the pile hole before the over-poured concrete slurry hardens, and the removed concrete slurry can be effectively utilized. During the operation, the cutting base slowly rotates and descends to transfer the upper concrete slurry in the pile hole to the slurry cylinder above the cutting base, which is simple and fast, and the upper steel of the steel cage is taken out from the steel ring surrounding seat during the operation, avoiding damaging the steel cage. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and the descriptions thereof are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0029] Figure 1This is a schematic diagram of the device for removing the over-irrigated portion at the top of a cast-in-place pile provided by the present invention;

[0030] Figure 2 This is a schematic diagram of the cutting base as viewed from above;

[0031] Figure 3 This is a schematic diagram of the cutting base, drill pipe connector, and first grout stop pad as viewed from below;

[0032] Figure 4 A schematic diagram showing the positional relationship between the grout outlet, the cutting plate, and the first grout stop pad;

[0033] Figure 5 This is a schematic diagram of a reinforcing bar surround seat;

[0034] Figure 6 This is a schematic diagram of the reinforcing bar surround and the central support frame;

[0035] Figure 7 This is a schematic diagram illustrating the connection method between the casing and the drill pipe connector.

[0036] Figure 8 This is a sectional view of the cutting base;

[0037] Figure 9 for Figure 8 Enlarged view of section A in the middle;

[0038] Figure 10 This is a schematic diagram of the slurry cylinder;

[0039] Figure 11 A diagram showing the state of the pile hole before the excess concrete was removed.

[0040] Figure 12 A diagram showing the state of the pile hole after the excess concrete has been removed.

[0041] In the diagram, 1. Pile hole; 2. Reinforcing cage; 3. Over-poured concrete slurry with uneven quality; 100. Cutting base; 110. Grout outlet hole; 120. First grout stop pad; 130. Cutting plate; 140. Drill rod connector; 200. Reinforcing bar surround seat; 210. Reinforcing bar through hole; 220. Reinforcing bar through groove; 230. Second grout stop pad; 240. Support edge; 300. Central support frame; 310. Sleeve; 320. Horizontal bar; 330. Vertical bar; 400. Grout cylinder; 510. Clamp; 520. First annular shoulder; 530. Second annular shoulder; 540. First thrust bearing; 550. Second thrust bearing; 600. Reinforcing bar protective sleeve. Detailed Implementation

[0042] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0043] It should be noted that in the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways beyond the specific embodiments described herein. Accordingly, the scope of the present application is not limited to the specific embodiments described in the following description.

[0044] As shown in Figure 1 The present application provides a device for removing the over-poured part of the pile top of a cast-in-place pile, which comprises a cutting base 100, a reinforcing ring surrounding seat 200, a central support frame 300 and a slurry cylinder 400.

[0045] Referring to Figures 2-4 The cutting base 100 is circular and can rotate along the circumferential direction under the driving of an external force. A plurality of slurry ejection holes 110 are formed through the cutting base 100, and the upper hole openings of the slurry ejection holes 110 are covered with first slurry stopping pads 120. The front side of the first slurry stopping pads 120 relative to the rotation direction is fixed to the front side edge of the upper hole openings of the slurry ejection holes 110, and the other side edges are freely covered on the edge of the upper hole openings of the slurry ejection holes 110. A plurality of cutting plates 130 corresponding to the slurry ejection holes 110 are fixed to the bottom surface of the cutting base 100. The rear side of the cutting plates 130 relative to the rotation direction is fixed to the rear side edge of the lower hole openings of the slurry ejection holes 110, and the front side is inclined forward and downward.

[0046] When the cutting base 100 is placed on the surface of the concrete slurry and slowly rotates and descends along the arrow direction, the cutting plates 130 will apply an upward and forward thrust to the concrete slurry that contacts them, and the stirred concrete slurry will lift the slurry stopping pads and flow out of the slurry ejection holes 110 to the upper side of the cutting base 100. The rotating and cutting movement of the cutting base 100 can make the upper layer of the concrete slurry in the pile hole 1 be transferred to the upper side of the cutting base 100, thereby ensuring the construction quality of the pile top.

[0047] If only the slurry ejection holes and the first slurry stopping pads are provided on the cutting base, and the cutting base is vertically pressed into the concrete slurry to make the concrete slurry be transferred to the upper side of the cutting base, this method requires that the concrete slurry has good fluidity, and a large pressure needs to be applied to the cutting base to make the concrete slurry be ejected from the slurry ejection holes. Moreover, the concrete slurry can only be transferred to the upper side of the cutting base from a few fixed slurry ejection holes, which will cause a large disturbance to the concrete slurry and affect the construction quality of the pile top, and cannot achieve the construction effect of the present application.

[0048] When the cutting base rotates, the first grout stopper 120 can be smoothly pushed away by the concrete grout thrust force; when the cutting base 100 stops rotating, the first grout stopper 120 is attached and blocked on the grout hole 110 under the gravity and the pressure of the upper concrete grout, preventing the upper concrete grout from falling back to the pile hole 1 through the grout hole 110.

[0049] In order to facilitate the driving of the cutting base to rotate, the cylindrical drill rod connector 140 is fixed on the top center of the cutting base 100, and the drill rod connector is connected with the drill rod of the drilling machine.

[0050] The reinforcement cage 2 is fixed in the pile hole 1, and the cutting base 100 rotates in the inner region surrounded by the reinforcement cage 2 during operation. When the cutting base 100 rotates and falls to a certain depth in the pile hole, the cutting base 100 needs to be lifted to remove the concrete grout above from the pile hole 1, so the area between the cutting base 100 and the inner wall of the pile hole 1 needs to be blocked. Therefore, as shown in Figure 5 The reinforcement surrounding seat 200 is annular, coaxially sleeved on the outside of the cutting base 100, and the inner diameter of the reinforcement surrounding seat 200 is close to the outer diameter of the cutting base 100. A plurality of reinforcement through holes 210 are formed on the reinforcement surrounding seat 200, and the upper reinforcement of the reinforcement cage can pass through the reinforcement through holes 210.

[0051] The reinforcement cage through hole can adopt a single hole for a single reinforcement to pass through, or an arc-shaped hole for multiple reinforcements to pass through.

[0052] When the reinforcement cage through hole adopts an arc-shaped hole, in order to improve the sealing performance of the reinforcement surrounding seat 200, the following structure can be adopted: a plurality of arc-shaped reinforcement through grooves 220 are formed on the reinforcement surrounding seat 200, a second grout stopper 230 is covered on the upper groove opening and the lower groove hole of the reinforcement through groove 220, and a reinforcement through hole 210 is formed on the second grout stopper 230 on both sides. In application, a plurality of reinforcements pass through the same reinforcement through groove 220 and pass through the reinforcement through holes 210 on the second grout stopper 230 respectively.

[0053] The reinforcement surrounding seat 200 does not rotate, but needs to move up and down with the cutting base 100. In order to meet this movement requirement, the cutting base 100 and the reinforcement surrounding seat 200 are rotationally connected by the center support frame 300.

[0054] Specifically, as shown in Figure 6 and Figure 7As shown in the figure, the center support frame 300 is arranged above the cutting base 100 and the steel reinforcement surrounding base 200, the center support frame 300 comprises a sleeve 310 and several horizontal rods 320 fixed around the sleeve 310, the outer ends of the horizontal rods 320 are fixedly connected with the top of the steel reinforcement surrounding base 200 through vertical rods 330, and the drill rod connector 140 passes through the sleeve 310. In this way, the cutting base 100 and the steel reinforcement surrounding base 200 can move up and down synchronously, and the cutting base 100 can also rotate.

[0055] As shown in the figure, Figures 8-10 As shown in the figure, the slurry cylinder 400 is arranged around the top of the cutting base 100 and the steel reinforcement surrounding base 200, and the lower cylinder opening of the slurry cylinder 400 is buckled on the outer edge of the steel reinforcement surrounding base 200. In this way, the slurry cylinder 400, the cutting base 100 and the steel reinforcement surrounding base 200 form a cylinder shell with a bottom wall and a circumferential side wall, and the concrete slurry is transported and contained in the cylinder shell. The overfilled concrete slurry can be discharged from the pile hole by lifting the cylinder shell upward away from the pile hole.

[0056] In order to realize the synchronous up-and-down movement of the cutting base 100 and the steel reinforcement surrounding base 200 and the rotation of the cutting base 100, in the preferred embodiment, the sleeve 310 is connected with the drill rod connector 140 through a clamp 510, a bearing or the like.

[0057] Specifically, the drill rod connector 140 above the sleeve 310 is provided with the clamp 510, the clamp 510 is formed by two clamp bodies, and the clamp 510 can be fixed on the drill rod connector 140 by locking the two clamp bodies through bolts to prevent the clamp 510 from moving up and down.

[0058] The drill rod connector 140 below the sleeve 310 is coaxially provided with a first annular shoulder 520, and the lumen of the sleeve 310 is coaxially provided with a second annular shoulder 530, the drill rod connector 140 above and below the second annular shoulder 530 is respectively sleeved with a first thrust bearing 540 and a second thrust bearing 550, the top and bottom of the first thrust bearing 540 are respectively abutted with the bottom of the clamp 510 and the top of the second annular shoulder 530, and the top and bottom of the second thrust bearing 550 are respectively abutted with the bottom of the second annular shoulder 530 and the top of the first annular shoulder 520. The vertical force between the sleeve 310 and the clamp 510 and the first annular shoulder 520 is transmitted through the first thrust bearing 540 and the second thrust bearing 550 to ensure the normal rotation of the drill rod connector 140.

[0059] Furthermore, the device for removing over-pouring concrete from the top of a cast-in-place pile provided by the present invention also includes several reinforcing bar protective sleeves 600, each of which is used to sleeve the upper end of the reinforcing bar inside the pile hole. During the removal of over-pouring concrete, the reinforcing bar protective sleeves 600 wrap and protect the reinforcing bar; after removal is completed, the reinforcing bar protective sleeves 600 can be removed.

[0060] In a preferred embodiment, a support edge 240 is provided around the outer edge of the rebar winding seat 200, and the lower opening of the slurry cylinder 400 is fastened to the support edge 240, so as to facilitate the connection between the slurry cylinder 400 and the rebar winding seat 200.

[0061] Typically, three grout outlets 110 can be provided. The first grout stop pad 120 and the second grout stop pad 230 are made of plywood and are pressed and fixed to the cutting base 100 by steel pressure strips. The bottoms of the cutting plate 130, the steel pressure strip, and the drill rod connector 140 are fixedly connected to the cutting base 100 by hexagonal socket head cap screws.

[0062] like Figure 11 The diagram shows the pile hole after concrete has been poured and the steel casing has been removed. The upper part of the pile hole contains unevenly poured concrete slurry 3, which needs to be removed from the pile hole.

[0063] The method for removing the over-poured portion at the top of a cast-in-place pile provided by this invention uses the aforementioned removal device to remove the over-poured concrete, and specifically includes the following steps:

[0064] S1. Assemble the cutting base 100, the rebar wrapping seat 200, the central support frame 300 and the slurry cylinder 400 to form the cleaning device. Connect the drill rod of the drilling rig to the drill rod connector 140, adjust the verticality of the drill rod and the position of the rebar wrapping seat 200, so that the rebar through hole 210 is aligned with the rebar in the pile hole.

[0065] The assembly method of the cleaning device is as follows: install the first thrust bearing 540, the sleeve 310, and the second thrust bearing 550 above the first annular shoulder 520 of the drill pipe connector 140; connect the horizontal bar 320 on the sleeve 310 to the rebar surround seat 200 through the vertical bar 330; and lock the clamp 510.

[0066] S2. Control the drill rod to drive the cleaning device to move downward in the pile hole, so that the reinforcing bar passes through the reinforcing bar through hole 210 and the cutting base 100 descends to the concrete slurry surface in the pile hole.

[0067] S3. Control the drill rod to rotate and descend. The drill rod will drive the cutting base 100 to rotate and cut the concrete slurry. After the concrete slurry pushes open the first grout stop pad 120, it will be transferred to the top of the cutting base 100 through the grout outlet hole 110.

[0068] S4. After the cutting base 100 is lowered to the specified height, the drill rod stops rotating, the first grout sealing pad 120 blocks the grout hole 110, and the concrete grout is kept in the grout cylinder 400;

[0069] S5. The drill rod is controlled to rise, the cleaning device is lifted to the ground, and the pile hole is left, and the cleaning operation is completed. The concrete grout in the cleaning device can be effectively utilized.

[0070] As shown in the Figure 12 , a schematic diagram of a cast-in-place pile after the super-filling concrete is cleaned.

[0071] Preferably, the method for cleaning the super-filling part of the top of the cast-in-place pile provided by the present application further comprises the following steps:

[0072] S6. The upper part of the concrete grout in the pile hole is vibrated by using the vibration rod, so that the liquid surface is flat.

[0073] Further, the step S1 further comprises the operation of sleeving the steel sleeve 310 on the steel bar, and the step S5 further comprises the operation of taking off the steel sleeve 310 from the steel bar.

[0074] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0075] In the present application, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection", "fixation" and the like should be understood broadly, for example, can be fixedly connected, can be detachably connected, or can be integrated; can be directly connected, or can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0076] The parts not described in the present application are well-known technologies to those skilled in the art.

Claims

1. A device for removing the excess concrete from the top of a cast-in-place pile, characterized in that, The utility model provides a kind of clear device, including: Circular cutting base, the cutting base can rotate along its circumferential direction, a plurality of steam holes are opened in the cutting base, the upper orifice of each steam hole is covered with first steam pad, the front side of first steam pad relative to rotating direction is fixed in the upper orifice front side edge of steam hole, other side is freely covered in the upper orifice edge of steam hole, the bottom surface of cutting base is fixed with a plurality of cutting plates corresponding to steam hole, the rear side of cutting plate relative to rotating direction is fixed in the lower orifice rear side edge of steam hole, front side is inclinedly arranged forward and downward, the top center of cutting base is fixed with cylindrical drill rod connector; Annular reinforcement ring around seat, the reinforcement ring around seat is coaxially sleeved on the outside of cutting base, reinforcement ring around seat is opened with reinforcement through hole; Center support frame, the center support frame is arranged above cutting base and reinforcement ring around seat, the center support frame includes sleeve pipe and a plurality of horizontal rods fixed around it, the outer end of horizontal rod is fixedly connected with reinforcement ring around seat by vertical rod, drill rod connector passes through sleeve pipe; Slurry cylinder, slurry cylinder is surrounded in the top of cutting base and reinforcement ring around seat, the lower cylinder mouth of slurry cylinder is buckled in the outer edge of reinforcement ring around seat; The sleeve pipe is provided with a clamp above the drill rod connector, the sleeve pipe is coaxially provided with a first annular shoulder above the drill rod connector below, the sleeve pipe is coaxially provided with a second annular shoulder in the middle of lumen, the drill rod connector above and below the second annular shoulder is respectively provided with a first thrust bearing and a second thrust bearing, the top and bottom of first thrust bearing are respectively abutted with the bottom of clamp and the top of second annular shoulder, the top and bottom of second thrust bearing are respectively abutted with the bottom of second annular shoulder and the top of first annular shoulder.

2. The device for cleaning the over-poured part of the pile top of a cast-in-place pile according to claim 1, characterized in that, The reinforcement ring around seat is opened with a plurality of arc-shaped reinforcement through slots, the upper slot of reinforcement through slot and the lower slot hole are covered with second steam pad, the second steam pad is opened with reinforcement through hole.

3. The device for cleaning the over-poured portion of the pile top of a cast-in-place pile according to claim 1, characterized in that, The first steam pad and second steam pad are made of wire clamping rubber.

4. The device for cleaning the over-poured portion of the pile top of a cast-in-place pile according to claim 1, characterized in that, It also includes a plurality of reinforcement protection sleeve pipes, each reinforcement protection sleeve pipe is used to sleeve the upper end of reinforcement in pile hole.

5. The device for cleaning the over-poured portion of the pile top of a cast-in-place pile according to claim 1, characterized in that, The outer edge of reinforcement ring around seat is provided with a support edge, and the lower cylinder mouth of slurry cylinder is buckled on the support edge.

6. Method for the removal of the over-poured part of the pile head of a cast-in-place pile, characterized in that, The clear device of any one of claims 1-5 is used, and the following steps are included: S1. the drill rod of drilling machine is connected with drill rod connector, the perpendicularity of drill rod and the position of reinforcement ring around seat are adjusted, so that reinforcement through hole is aligned with reinforcement in pile hole; S2. control drill rod to drive the clear device to move downward in pile hole, so that cutting base is lowered to concrete slurry liquid level in pile hole; S3. control drill rod to rotate and descend, drill rod drives cutting base to rotate, and concrete slurry is cut, so that concrete slurry passes through steam hole after first steam pad is opened, and reaches above cutting base; S4. after cutting base is lowered to specified height, drill rod stops rotating, first steam pad blocks steam hole, so that concrete slurry is kept in slurry cylinder. S5. Control the drill rod to go up, take the cleaning device to the ground, and leave the pile hole.

7. The method of removing excess concrete from the top of a cast-in-place pile according to claim 6, wherein Further comprising the following steps: S6. Vibrate the upper part of the concrete slurry in the pile hole with a vibrating rod to make the liquid surface flat.

8. The method of removing excess concrete from the top of a cast-in-place pile according to claim 6, wherein In step S1, the operation of sleeving the reinforcing steel bar sleeve on the reinforcing steel bar is further included, and in step S5, the operation of taking off the reinforcing steel bar sleeve from the reinforcing steel bar is further included.

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