A rapid pile cutting device and method for a cast-in-place pile

Abstract

The application discloses a kind of quick pile cutting device and pile cutting method of bored pile, belong to underground pile foundation construction field.The pile cutting device includes first partition disc, second partition disc, center sleeve and connecting rod.First partition disc and second partition disc are stacked up and down, and all include corresponding center hole, overflow hole and steel hole;Center sleeve is provided with eaves at both ends;The same side of all steel holes of first partition disc is provided with arc slot, and the upper surface of first partition disc is provided with connecting rod.First partition disc and second partition disc of the application are stacked, mud and concrete can pass through overflow hole smoothly, and after concrete pouring is completed, rotate first partition disc to make overflow hole dislocation, can form weak surface at the interface of first partition disc and second partition disc, when cutting pile, only need to pull connecting rod, using weak surface can remove first partition disc and the excess concrete above it integrally, greatly improve construction efficiency and guarantee the quality of pile top after cutting pile.

Description

Technical Field

[0001] This invention relates to a rapid pile cutting device and method for cast-in-place piles, belonging to the field of underground pile foundation construction. Background Technology

[0002] Cast-in-place piles, as an important type of pile foundation structure, are widely used in building construction. During the construction of cast-in-place piles, to ensure the quality of the concrete at the pile top, over-pouring is usually required. This means that the height of the poured concrete exceeds the design pile top elevation. After the concrete has solidified, the pile is cut off to remove the inferior concrete from the over-pouring section, ensuring the pile top reaches the design elevation. Typically, the longitudinal reinforcement bars of the over-pouring section's steel cage need to be retained for connection to the superstructure.

[0003] Currently, specialized pile-cutting devices exist to break up pile heads, but these can cause damage to the concrete at the top of the pile and even the longitudinal reinforcement at the top. Isolation plates are also used to separate the concrete, but the strong bond between the concrete and the isolation plate hinders pile cutting. Furthermore, large holes need to be created in the isolation plate during concrete pouring, and the plain concrete within these holes is also unsuitable for pile cutting.

[0004] In summary, there is an urgent need to invent a rapid pile cutting device and method for cast-in-place piles that can improve pile cutting efficiency and quality. Summary of the Invention

[0005] In view of the problems existing in the cutting of cast-in-place piles, such as the need for specialized cutting equipment, high cutting costs, low cutting efficiency, and easy damage to the concrete surface at the top of the pile, this invention provides a rapid cutting device and method for cast-in-place piles to solve the above problems.

[0006] To solve the above technical problems, the present invention includes the following technical solutions:

[0007] A rapid pile cutting device for cast-in-place piles includes: a first partition plate, a second partition plate, a central sleeve, and a connecting rod;

[0008] The first and second partition plates are stacked one on top of the other, each including a central hole, an overflow hole, and a reinforcing bar hole corresponding to the position; several overflow holes are arranged around the central hole, and the number and position of the reinforcing bar holes match the number and position of the longitudinal bars at the top of the reinforcing cage of the cast-in-place pile;

[0009] The central sleeve is disposed in the central hole of the first and second partition plates, with both the top and bottom ends extending out of the central hole. The central sleeve has protruding eaves at both ends, and the first and second partition plates are located between the two protruding eaves. The first partition plate can rotate around the central sleeve. The outer wall of the central sleeve forms a weak stress surface at the interface between the first and second partition plates by setting an annular groove.

[0010] All the reinforcing bar holes on the first partition plate are provided with arc-shaped slots on the same side. A connecting rod is provided on the upper surface of the first partition plate. Rotating the connecting rod can make the first partition plate rotate, so that the longitudinal reinforcing bars of the reinforcing cage can move from the reinforcing bar holes on the first partition plate into the arc-shaped slots, and the overflow holes of the first partition plate and the second partition plate are staggered.

[0011] Furthermore, anchor bars are provided on the lower surface of the second separator plate.

[0012] Furthermore, a hollow annular tip is provided on the inner wall of the central sleeve at the interface between the first and second partition discs, and the annular tip can form an annular notch in the plain concrete column in the central sleeve.

[0013] Furthermore, a sliding cover plate is provided inside the arc-shaped slot. The sliding cover plate includes a top plate and a slider. The slider is located at the bottom of one end of the top plate. The slider is located inside the arc-shaped slot and can slide along the center line of the arc-shaped slot. When the slider is located on one side of the rebar hole, the sliding cover plate can cover the arc-shaped slot.

[0014] Accordingly, the present invention also provides a method for rapid pile cutting of cast-in-place piles, comprising the following steps:

[0015] Step 1: Install the quick pile cutting device at the preset position on the reinforcing cage of the cast-in-place pile, so that the longitudinal bars of the reinforcing cage pass through the reinforcing bar holes of the first and second partition plates, the grouting pipe passes through the central sleeve and is fixed to the reinforcing cage, and a reinforcing bar protective sleeve is set on the longitudinal reinforcing bar at the top of the reinforcing cage, with the bottom height of the reinforcing bar protective sleeve matching the position of the first partition plate.

[0016] Step 2: After the pile hole of the cast-in-place pile is formed, the steel cage is placed into the pile hole, so that the interface between the first partition plate and the second partition plate is located at the designed height of the pile top. Concrete is poured from bottom to top.

[0017] Step 3: After the top height of the concrete is above the first partition plate and the concrete meets the over-pouring height requirement of the cast-in-place pile, rotate the connecting rod to rotate the first partition plate, so that the overflow holes of the first partition plate and the second partition plate are misaligned.

[0018] Step 4: After the concrete has solidified, the cast-in-place pile forms a weak stress surface at the interface between the first and second partition plates. When it is necessary to cut the pile, pull the connecting rod upward to lift and remove the first partition plate, the reinforcing steel sleeve, and the concrete above the first partition plate together.

[0019] Furthermore, a sliding cover plate is provided inside the arc-shaped slot. The sliding cover plate includes a top plate and a slider. The slider is located at the bottom of one end of the top plate. The slider is located inside the arc-shaped slot and can slide along the center line of the arc-shaped slot. When the slider is located on one side of the rebar hole, the sliding cover plate can cover the arc-shaped slot.

[0020] In step three, when the connecting rod is rotated to make the first partition plate rotate, the longitudinal steel bar applies a force to the end of the sliding cover plate, causing the slider to move within the arc-shaped slot.

[0021] Furthermore, the outer wall of the central sleeve at the interface between the first and second partition plates forms an annular weak stress surface by setting a slot; the inner wall of the central sleeve at the interface between the first and second partition plates is provided with a hollow annular tip, which enables the plain concrete column in the central sleeve to form an annular notch.

[0022] In step four, when the connecting rod is pulled upward, the central sleeve and the plain concrete column in the central sleeve break along the interface between the first and second partition plates.

[0023] The beneficial effects of this invention are as follows: compared with the prior art, by designing a pre-set separation device and a weak stress surface, rapid pile cutting of cast-in-place piles is achieved, significantly improving pile cutting efficiency and reducing construction costs; by coordinating the design of the rebar hole and the arc-shaped groove hole, damage to the rebar is avoided, ensuring the quality of the pile foundation; by setting the overflow hole in a staggered manner, a weak stress surface is formed on the separation surface, making the pile cutting operation simple and easy, reducing construction difficulty and safety risks.

[0024] This invention, by employing the above technical solutions, offers the following advantages and positive effects compared to existing technologies: The rapid pile cutting device for cast-in-place piles in this invention achieves rapid pile cutting through the design of a relatively rotatable separating device (first and second separating discs) and the weak stress surface of the central sleeve, significantly improving cutting efficiency and reducing construction costs. The overflow hole can discharge the mud below during concrete pouring and solves the problem of concrete aggregate accumulating below the separating discs. After concrete pouring, the overflow hole can be cut off by rotating the first and second separating discs, reducing cutting resistance and construction difficulty. During pile cutting, simply pulling the connecting rod allows the first separating disc and excess concrete above it to be removed as a whole using the interface of the separating device and the weak stress surface of the central sleeve, achieving a rapid and clean pile cutting effect, greatly improving construction efficiency and ensuring the quality of the pile top after cutting. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the rapid pile cutting device for cast-in-place piles according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 Sectional view along the middle AA;

[0027] Figure 3 A top view of a first partition plate provided in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of a sliding cover plate structure provided in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the central sleeve provided in an embodiment of the present invention;

[0030] Figure 6 A longitudinal slope view of the central sleeve provided in an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of a rapid pile cutting device for cast-in-place piles installed on a reinforcing cage, according to an embodiment of the present invention.

[0032] The numbers in the diagram are as follows:

[0033] 1-Casing; 2-Pile hole; 3-Reinforcing cage; 4-Longitudinal reinforcement; 5-Stirrups; 6-Protective sleeve;

[0034] 10-First partition plate; 11-Central hole; 12-Overflow hole; 13-Reinforcing bar hole; 14-Arc-shaped slot hole; 15-Sliding cover plate; 16-Top plate; 17-Slider;

[0035] 20 - Second dividing plate;

[0036] 30 - Center sleeve; 31 - Eaves; 32 - Annular groove; 33 - Annular tip;

[0037] 40 - Connecting rod. Detailed Implementation

[0038] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the rapid pile cutting device and method for cast-in-place piles provided by the present invention. The advantages and features of the present invention will become clearer from the following description. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0039] Example 1

[0040] like Figure 1 As shown, the rapid pile cutting device for cast-in-place piles provided in this embodiment includes four main components: a first partition plate 10, a second partition plate 20, a central sleeve 30, and a connecting rod 40.

[0041] Combination Figures 1 to 3As shown, the first dividing plate 10 and the second dividing plate 20 are circular discs of the same size, stacked one on top of the other, with the first dividing plate 10 located above the second dividing plate 20. The main function of the two dividing plates is that after the concrete is poured, the over-poured concrete adheres to the upper surface of the first dividing plate 10, and the concrete of the normal pile body adheres to the lower surface of the second dividing plate 20. There is no concrete between the first dividing plate 10 and the second dividing plate 20, forming a natural dividing surface. When cutting off the over-poured pile head, only a small force is needed to break it at this interface.

[0042] Combination Figures 1 to 3 As shown, both the first partition plate 10 and the second partition plate 20 are provided with corresponding central holes 11, overflow holes 12, and reinforcing bar holes 13. The central hole 11 is located in the center of the partition plate and is used to accommodate the central sleeve 30. Several overflow holes 12 are arranged in a ring around the central hole 11. These overflow holes 12 allow slurry to flow through during concrete pouring and also ensure that cement slurry and aggregates in the concrete pass through from bottom to top. The overflow holes 12 can be set as needed. The main function of the overflow holes 12 is to prevent aggregates from accumulating below the partition plate due to obstruction of the rising concrete during concrete pouring. Preferably, the diameter of the overflow holes 12 is greater than twice the maximum particle size of the aggregates, thereby ensuring that the aggregates can pass through the overflow holes 12 smoothly, making the concrete material uniform and ensuring the quality of the concrete. Setting multiple overflow holes 12 can reduce the diameter of the central hole 11, so that the function of the central hole 11 only needs to meet the passage of the grouting pipe, which also reduces the difficulty of cutting off the plain concrete in the central hole 11 later. The number and location of the reinforcing bar holes 13 are precisely matched with the number and location of the longitudinal bars at the top of the reinforcing cage of the cast-in-place pile, ensuring that the reinforcing cage can accurately pass through the partition plate and maintain the correct positional relationship.

[0043] Combination Figures 1 to 3 and Figure 5 , Figure 6 As shown, the central sleeve 30 is disposed in the central hole 11 of the first partition plate 10 and the second partition plate 20, with both the top and bottom ends of the central sleeve 30 extending out of the central hole 11. The central sleeve 30 provides a channel for the grouting pipe. Both ends of the central sleeve 30 are provided with protrusions 31, the diameter of the outer circle of the protrusion 31 being larger than the inner diameter of the central hole 11. When the protrusion adopts a ring structure, the outer diameter of the ring is larger than the inner diameter of the central hole. This means that the protrusions 31 at both ends of the central sleeve 30 can hold the two partition plates together, preventing them from separating during construction. Furthermore, the central sleeve 30 can also serve as a pivot for the rotation of the partition plates.

[0044] It should be noted that the numerous overflow holes 12 can prevent the accumulation of aggregates in the concrete below the second partition plate, thereby improving the concrete quality below the second partition plate. However, a problem also exists: plain concrete columns will form in the vertically connected overflow holes 12. These plain concrete columns need to be cut off during pile cutting, increasing the difficulty of pile cutting and potentially damaging the pile head at the cut-off surface. The first partition plate 10 can rotate around the central sleeve 30. This rotating mechanism is the core functional component of the entire device, eliminating the problem of plain concrete column cutting caused by the overflow holes 12. All the reinforcing bars 13 on the first partition plate 10 have arc-shaped slots 14 on the same side, which are connected to the reinforcing bars 13, forming a continuous channel. When the first partition plate 10 rotates, the longitudinal reinforcing bars of the reinforcing cage can move from the reinforcing bars 13 into the arc-shaped slots 14. A connecting rod 40 is provided on the upper surface of the first partition plate 10, which serves as an operating handle. Workers can drive the first partition plate 10 to rotate by rotating the connecting rod 40. When the first partition plate 10 rotates, the overflow holes 12 of the first partition plate 10 and the second partition plate 20 will be misaligned. Under normal pouring conditions, the overflow holes 12 of the two partition plates are perfectly aligned, forming a vertically connected channel through which concrete can flow freely. After rotation, the overflow holes 12 are misaligned, blocking the flow path of concrete and creating a weak stress surface at the interface of the partition plates, thus creating conditions for subsequent pile cutting operations.

[0045] In a preferred embodiment, anchor bars are provided on the lower surface of the second partition plate 20. The anchor bars form a mechanical anchoring connection with the concrete, enhancing the bonding strength between the second partition plate 20 and the lower concrete, ensuring that the second partition plate 20 can remain firmly in the lower pile body during pile cutting operations, and will not be pulled out along with the upper concrete.

[0046] In a preferred embodiment, combined with Figures 1 to 3 , Figure 5 and Figure 6As shown, the central sleeve 30 forms a weak stress surface at the interface between the first separator 10 and the second separator 20 by setting an annular groove 32. This annular groove 32 weakens the cross-sectional area of ​​the central sleeve 30 at the interface, resulting in a significant reduction in the tensile strength of the central sleeve 30 at this location. When the pile cutting operation is performed, the central sleeve 30 will preferentially fracture at this weak surface, achieving the separation of the upper and lower parts of the central sleeve 30. A more preferred embodiment is to provide a hollow annular tip 33 at a position corresponding to the opening of the annular groove 32 on the inner side of the central sleeve 30. The annular tip 33 can form an annular notch in the plain concrete column in the central sleeve 30. The tensile strength of the plain concrete column in the central sleeve 30 is reduced at the annular notch, forming a weak surface under stress. When the pile cutting operation is performed, the plain concrete column will break first at this weak surface, realizing the separation of the plain concrete column. This makes the fracture surface of the plain concrete column, the fracture surface of the central sleeve 30, and the interface of the two partition plates on the same plane, which greatly reduces the difficulty of pile cutting, ensures the flatness of the fracture surface, and can prevent damage to the concrete surface at the normal elevation.

[0047] In a preferred embodiment, if stones entering the arc-shaped slot 14 might obstruct the rotation of the first partition plate 10, dense bristles or filaments fixed at one end can be provided within the arc-shaped slot 14 to prevent stones from entering the slot 14, without hindering the longitudinal reinforcing bars from being squeezed into the arc-shaped slot 14 when the first partition plate 10 rotates. As a preferred embodiment, combined with... Figures 1 to 4 As shown, a sliding cover plate 15 is provided inside the arc-shaped slot 14. The sliding cover plate 15 consists of a top plate 16 and a slider 17, with the slider 17 located at the bottom of one end of the top plate 16. The slider 17 is located inside the arc-shaped slot 14 and can slide along the centerline of the arc-shaped slot 14. When the slider 17 is located on one side of the rebar hole 13, the sliding cover plate 15 can completely cover the arc-shaped slot 14. This design can prevent stones from entering the arc-shaped slot 14 during concrete pouring, ensuring that the longitudinal rebar can smoothly enter the arc-shaped slot 14 when needed.

[0048] The working principle of the rapid pile cutting device for cast-in-place piles provided in this embodiment is as follows: through the clever combination of mechanical rotation and structural design, a controllable weak section is created after the concrete is poured. When it is necessary to cut the pile, by pulling the connecting rod 40, the excess concrete above the first partition plate 10 can be removed as a whole by utilizing the existence of the weak section, so as to achieve a rapid and clean pile cutting effect, which greatly improves the construction efficiency and ensures the quality of the pile top after pile cutting.

[0049] Example 2

[0050] This invention provides a rapid pile cutting method for cast-in-place piles, enabling quick and efficient pile cutting operations after the completion of cast-in-place pile construction, avoiding the noise, vibration, and low efficiency problems of traditional mechanical crushing methods. The following is a detailed description... Figures 1 to 7 The pile cutting method is further described below, comprising:

[0051] Step 1: Install the rapid pile cutting device at the predetermined position on the reinforcing cage 3 of the cast-in-place pile. During cast-in-place pile construction, a steel casing 1 is typically driven vertically into the location of the pile hole to be constructed, followed by the construction of the pile hole 2. After the pile hole is completed, a reinforcing cage 3 is placed inside the pile hole 2. The reinforcing cage 3 includes longitudinal reinforcing bars 4 and stirrups 5. Installing the rapid pile cutting device at the predetermined position on the reinforcing cage 3 involves: passing the longitudinal reinforcing bars 4 at the top of the reinforcing cage 3 through the reinforcing bar holes 13 of the first partition plate 10 and the second partition plate 20; passing the grouting pipe through the central sleeve 30 and fixing it to the reinforcing cage 3; and installing a reinforcing bar protective sleeve 6 on the longitudinal reinforcing bars 4 at the top of the reinforcing cage 3, with the bottom height of the reinforcing bar protective sleeve 6 matching the position of the first partition plate 10. Because the interface between the first partition plate 10 and the second partition plate 20 is the pile cutting surface, it is necessary to accurately position the rapid pile cutting device on the top longitudinal reinforcing bar of the reinforcing cage.

[0052] Step 2: After the pile hole 2 is formed, the reinforcing cage 3 is placed into the pile hole 2, ensuring that the interface between the first partition plate 10 and the second partition plate 20 is at the designed height of the pile top. Concrete is then poured from bottom to top. During construction, the depth of the reinforcing cage 3 should be precisely controlled so that the interface between the first partition plate 10 and the second partition plate 20 is at the designed height of the pile top. Accurate positioning of this position is crucial for ensuring the pile cutting effect. After the reinforcing cage 3 is in place, the grouting pipe is located at the bottom of the pile hole. The concrete is poured from bottom to top, ensuring that the grout outlet is below the concrete surface. As the concrete surface rises, the grouting pipe is moved upwards. When the concrete surface reaches the position of the second partition plate, due to the presence of multiple overflow holes, the concrete can smoothly pass through the partition plate, ensuring that the concrete fully fills the pile hole space and is of uniform material.

[0053] Step 3: After the top height of the concrete is above the first partition plate 10 and the concrete meets the over-grouting height requirement for the cast-in-place pile, remove the grouting pipe and rotate the connecting rod 40 to rotate the first partition plate 10, causing the overflow holes 12 of the first partition plate 10 and the second partition plate 20 to be misaligned. Rotating the first partition plate 10 moves the longitudinal steel bars of the reinforcing cage from the steel bar holes 13 on the first partition plate 10 into the arc-shaped slot 14, while simultaneously misaligning the overflow holes 12 of the first partition plate 10 and the second partition plate 20. This operation changes the connection state between the partition plates, laying the foundation for the subsequent formation of a weak stress surface. The design of the arc-shaped slot 14 allows the steel bars to move smoothly when the first partition plate 10 rotates, avoiding obstruction of the rotation operation by the steel bars. In order to control the over-pouring height of the cast-in-place pile, a pressure sensor is installed on the upper surface of the first partition plate. Since the density of concrete is greater than that of mud, the pressure sensor is initially in the mud and the pressure it monitors is relatively stable. When the concrete overflows through the overflow hole, passes over the first partition plate and covers the pressure sensor, the pressure value monitored by the pressure sensor will change abruptly. As the concrete surface rises, the pressure value gradually increases, and the change in pressure value is linearly related to the change in height. Therefore, the height of the concrete surface can be monitored by the change in pressure value, thereby determining whether the concrete meets the over-pouring height requirement of the cast-in-place pile.

[0054] Step 4: Pile Cutting and Removal. After the concrete has solidified, a weak stress surface is formed at the interface between the first partition plate 10 and the second partition plate 20. When pile cutting is required, the connecting rod 40 is pulled upwards to lift and remove the first partition plate 10, the reinforcing steel sleeve 6, and the concrete above the first partition plate 10. To facilitate the formation of the weak stress surface, a release agent or lubricant can be applied to the bottom of the first partition plate and the top of the second partition plate. When the connecting rod is pulled to remove the pile head, the part that actually needs to be cut off is only the plain concrete column inside the central sleeve. Since multiple overflow holes have been set, the central sleeve only needs to allow the grouting pipe to pass through smoothly. Therefore, the inner diameter of the central sleeve is small, and the diameter of the plain concrete column inside the central sleeve is small. This reduces the difficulty of pile cutting, reduces the power requirements of the lifting equipment, and saves costs.

[0055] Throughout the pile cutting process, the weak stress surface plays a crucial role, allowing the over-poured concrete pile head to separate from the pile body below under relatively small external forces. The reinforcing steel protective sleeve 6 protects the longitudinal reinforcing steel from damage during removal, ensuring the structural integrity of the remaining pile body. Before the concrete sets, the sleeve 1 is removed and backfilled with sand. Traditional pile cutting methods require excavating the soil around the pile head to expose it, marking the cut-off surface on the outer wall of the pile head, and then using specialized pile cutting equipment to break and cut the pile head. The pile cutting method provided in this embodiment allows for easy cutting of the pile head along the weak stress surface without excavating the soil around the pile head. This method allows for precise control of the cutting position, enabling fast and clean pile cutting operations, significantly improving construction efficiency, reducing noise and vibration impact on the surrounding environment, and lowering construction costs.

[0056] In a preferred embodiment, a sliding cover plate 15 is provided inside the arc-shaped slot 14. The specific structure of the sliding cover plate 15 is described in Embodiment 1. When the slider 17 is located on one side of the rebar hole 13, the sliding cover plate 15 can cover the arc-shaped slot 14. At this time, the top plate 16 completely covers the opening of the arc-shaped slot 14, preventing stones from entering the arc-shaped slot 14 during concrete pouring. This covering function of the sliding cover plate 15 ensures the cleanliness of the internal space of the arc-shaped slot 14, providing a good passage for the subsequent movement of the rebar. In step three, when the connecting rod 40 is rotated to rotate the first dividing plate 10, the longitudinal rebar applies a force to the end of the sliding cover plate 15, causing the slider 17 to move within the arc-shaped slot 14. The sliding cover plate 15 significantly improves the reliability and practicality of the device. During the concrete pouring stage, the sliding cover plate 15 effectively prevents stones from entering the arc-shaped slot 14, avoiding the problem of the arc-shaped slot 14 being blocked, and ensuring the smooth movement of the subsequent first dividing plate 10. During the rotation of the first partition plate 10, the sliding cover plate 15 can move automatically under the push of the longitudinal steel bars, realizing the automatic opening of the arc-shaped slot 14. The whole process does not require any additional operation steps, which improves the convenience and efficiency of construction.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A rapid pile cutting device for cast-in-place piles, characterized in that, include: First partition plate, second partition plate, central sleeve and connecting rod; The first and second partition plates are stacked one on top of the other, each including a central hole, an overflow hole, and a reinforcing bar hole corresponding to the position; several overflow holes are arranged around the central hole, and the number and position of the reinforcing bar holes match the number and position of the longitudinal bars at the top of the reinforcing cage of the cast-in-place pile; The central sleeve is disposed in the central hole of the first and second partition plates, with both the top and bottom ends extending out of the central hole. The central sleeve has protruding eaves at both ends, and the first and second partition plates are located between the two protruding eaves. The first partition plate can rotate around the central sleeve. The outer wall of the central sleeve forms a weak stress surface at the interface between the first and second partition plates by setting an annular groove. All the reinforcing bar holes on the first partition plate are provided with arc-shaped slots on the same side. A connecting rod is provided on the upper surface of the first partition plate. Rotating the connecting rod can rotate the first partition plate, causing the longitudinal reinforcing bars of the reinforcing cage to move from the reinforcing bar holes on the first partition plate into the arc-shaped slots, thus misaligning the overflow holes of the first and second partition plates. A sliding cover plate is provided in the arc-shaped slot, which includes a top plate and a slider. The slider is located at the bottom of one end of the top plate and is located in the arc-shaped slot, sliding along the center line of the arc-shaped slot. When the slider is located on one side of the reinforcing bar hole, the sliding cover plate can cover the arc-shaped slot.

2. The rapid pile cutting device for cast-in-place piles as described in claim 1, characterized in that, Anchor bars are provided on the lower surface of the second separator plate.

3. The rapid pile cutting device for cast-in-place piles as described in claim 1, characterized in that, A hollow annular tip is provided on the inner wall of the central sleeve at the interface between the first and second partition plates. The annular tip can form an annular notch in the plain concrete column in the central sleeve.

4. A method for rapid pile cutting of cast-in-place piles, characterized in that, Includes the following steps: Step 1: Install the rapid pile cutting device as described in claim 1 at a predetermined position on the reinforcing cage of the cast-in-place pile, so that the longitudinal bars of the reinforcing cage pass through the reinforcing bar holes of the first and second partition plates, the grouting pipe passes through the central sleeve and is fixed to the reinforcing cage, and a reinforcing bar protective sleeve is set on the longitudinal reinforcing bar at the top of the reinforcing cage, the bottom height of the reinforcing bar protective sleeve matching the position of the first partition plate. Step 2: After the pile hole of the cast-in-place pile is formed, the steel cage is placed into the pile hole, so that the interface between the first partition plate and the second partition plate is located at the designed height of the pile top. Concrete is poured from bottom to top. Step 3: After the top height of the concrete is above the first partition plate and the concrete meets the over-pouring height requirement of the cast-in-place pile, rotate the connecting rod to make the first partition plate rotate, so that the overflow holes of the first partition plate and the second partition plate are misaligned; when the connecting rod is rotated to make the first partition plate rotate, the longitudinal steel bar applies a force to the end of the sliding cover plate, so that the slider moves in the arc-shaped slot. Step 4: After the concrete has solidified, the cast-in-place pile forms a weak stress surface at the interface between the first and second partition plates. When it is necessary to cut the pile, pull the connecting rod upward to lift and remove the first partition plate, the reinforcing steel sleeve, and the concrete above the first partition plate together.

5. The rapid pile cutting method for cast-in-place piles as described in claim 4, characterized in that, The central sleeve has a hollow annular tip on its inner wall at the interface between the first and second partition plates. The annular tip can form an annular notch in the plain concrete column in the central sleeve. In step four, when the connecting rod is pulled upward, the central sleeve and the plain concrete column in the central sleeve break along the interface between the first and second partition plates.

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