Pile drilling and pile drilling method

Abstract

The application discloses a bored pile reaming drill bit and a bored pile reaming construction method, and the bored pile reaming drill bit comprises a guide rod, a first reaming rotating assembly fixed to the guide rod, a second reaming rotating assembly slidably sleeved on the guide rod and a plurality of reaming rotating plates, the reaming rotating plates are connected between the first reaming rotating assembly and the second reaming rotating assembly, and when the second reaming rotating assembly slides to different positions in the preset section, the plurality of reaming rotating plates jointly form reaming drill bits with different reaming shapes. The second reaming rotating assembly slidably sleeved on the preset section of the guide rod is used for adjusting the distance between the second reaming rotating assembly and the first reaming rotating assembly, and then the reaming drill bit jointly formed by the plurality of reaming rotating plates is controlled, so that the space under different drilling environments is adapted, the bored pile reaming drill bit is conveniently lowered, reamed and lifted, and the technical problems of low hydraulic reaming efficiency, high cost, unsatisfactory reaming quality and complex construction process are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pile foundation construction, in particular to a bored pile reaming drill bit and a bored pile reaming construction method. BACKGROUND

[0002] At present, in the construction of a bored pile, a pile body part is provided with a branch plate and an enlarged head at the bottom end. Generally, a hydraulic device is used. The hydraulic device is placed in the position of the pile hole that needs to be reamed. By controlling the hydraulic arms (generally two or three hydraulic arms) of the hydraulic reaming device, the hydraulic arms are opened to squeeze the soil in the hole wall, and then the hydraulic arms are retracted. The hydraulic reaming device is rotated by a certain angle, the hydraulic arms are opened again, the hydraulic arms are retracted, and so on. After several times of reciprocation, an enlarged cavity is formed at the position that needs to be reamed. This method needs to additionally provide a set of hydraulic and reaming devices outside the normal construction equipment of the bored pile, which increases the construction cost. The hydraulic reaming device needs to be rotated several times to form an enlarged cavity, which is low in efficiency. If the rotation angle is not properly controlled, the enlarged cavity will be irregular, and even the volume will not be enough, resulting in a decrease in the bearing capacity of a single pile.

[0003] Therefore, how to provide a bored pile reaming method with higher reaming efficiency, lower cost and simpler construction process is a technical problem to be solved.

[0004] The above content is only used to assist in understanding the technical solutions of the present application and does not mean that the above content is prior art. SUMMARY

[0005] The main purpose of the present application is to provide a bored pile reaming drill bit and a bored pile reaming construction method, which aims to solve the technical problems of low hydraulic reaming efficiency, high cost, unsatisfactory reaming quality and complex construction process.

[0006] To achieve the above purpose, the present application provides a bored pile reaming drill bit, which comprises:

[0007] a guide rod;

[0008] a first reaming rotating assembly fixed at a preset position of the guide rod;

[0009] a second reaming rotating assembly slidably sleeved on a preset section of the guide rod; and

[0010] a plurality of reaming rotating plates, the first end of the reaming rotating plate being rotatably connected to the first reaming rotating assembly, and the second end of the reaming rotating plate being rotatably connected to the second reaming rotating assembly;

[0011] When the second reaming rotating assembly slides to different positions in the preset section, the plurality of reaming rotating plates collectively form a reaming drill bit with different reaming shapes.

[0012] Optionally, the first reaming rotating assembly comprises:

[0013] an end plate ring;

[0014] an end plate support arranged in the ring of the end plate ring, connecting the end plate ring and the guide rod, so that the end plate ring is fixed at a preset position of the guide rod;

[0015] a plurality of first reaming rotating shafts arranged outside the ring of the end plate ring and hinged to the second end of the corresponding reaming rotating plate.

[0016] Optionally, the second reaming rotating assembly comprises:

[0017] an inner ring slidingly sleeved on a preset section of the guide rod;

[0018] an outer ring, the outer ring being provided with a plurality of second reaming rotating shafts outside the ring of the outer ring, the plurality of second reaming rotating shafts being hinged to the first end of the corresponding reaming rotating plate;

[0019] an inner support arranged in the ring of the outer ring, connecting the inner ring and the outer ring, so that the outer ring slides with the inner ring.

[0020] Optionally, the reaming rotating plate comprises a first rotating plate, a second rotating plate and a third rotating shaft; wherein the first end of the first rotating plate is connected to the first reaming rotating assembly, the second end of the first rotating plate is hinged to the third rotating shaft, the first end of the second rotating plate is connected to the second reaming rotating assembly, and the second end of the second rotating plate is hinged to the third rotating shaft.

[0021] Optionally, the bored pile reaming drill bit further comprises a force applying frame arranged in the second reaming rotating assembly, the force applying frame driving the second reaming rotating assembly to slide on the preset section of the guide rod, so as to control the reaming shape of the reaming drill bit.

[0022] Optionally, the force applying frame comprises a force receiving part and a force applying part; wherein the force receiving part is used to connect the bored pile drilling equipment and provide the required torque for reaming, and the force applying part connects the force receiving part and the second reaming rotating assembly, and is used to drive the second reaming rotating assembly to perform the reaming action according to the torque received.

[0023] In addition, in order to achieve the above-mentioned purpose, the application further provides a bored pile reaming construction method, characterized in that the bored pile reaming drill bit as described above is used, and the method comprises the following steps:

[0024] lowering the bored pile reaming drill bit in the normal mode and moving it to the position to be reamed;

[0025] The pile bored hole reamer in the reaming mode is driven to perform a reaming action at a position to be reamed until reaming is completed, and the pile bored hole reamer is switched from the reaming mode back to the normal mode.

[0026] The pile bored hole reamer in the normal mode is lifted and moved out of the position where reaming is completed.

[0027] Optionally, the normal mode is that the distance between the first reaming rotating assembly and the second reaming rotating assembly of the pile bored hole reamer is at the farthest, so that the plurality of reaming rotating plates are in a flat state; and the reaming mode is that the distance between the first reaming rotating assembly and the second reaming rotating assembly of the pile bored hole reamer is not at the farthest, so that the plurality of reaming rotating plates are in a drill bit state.

[0028] Optionally, the reaming action is that the distance between the first reaming rotating assembly and the second reaming rotating assembly of the pile bored hole reamer is gradually shortened, so that the pile bored hole reamer formed by the plurality of reaming rotating plates is protruded towards the position to be reamed.

[0029] Optionally, the method further comprises: driving the pile bored hole reamer in the reaming mode to perform a reaming action at a position to be reamed by using a pile drilling device.

[0030] The present application provides a pile bored hole reamer and a pile bored hole reaming construction method. The pile bored hole reamer comprises a guide rod, a first reaming rotating assembly fixed at a preset position of the guide rod, a second reaming rotating assembly slidably sleeved on a preset section of the guide rod, and a plurality of reaming rotating plates connected between the first reaming rotating assembly and the second reaming rotating assembly. When the second reaming rotating assembly slides to different positions in the preset section, the plurality of reaming rotating plates collectively form a pile bored hole reamer with different reaming shapes. The present application adjusts the distance between the first reaming rotating assembly and the second reaming rotating assembly by using the second reaming rotating assembly slidably sleeved on the preset section of the guide rod, and then controls the pile bored hole reamer formed by the plurality of reaming rotating plates to adapt to the space in different drilling environments, so as to facilitate the lowering, reaming and lifting of the pile bored hole reamer, and solve the technical problems of low hydraulic reaming efficiency, high cost, unsatisfactory reaming quality and complex construction process. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 FIG. 1 is a structural schematic view of the pile bored hole reamer in the embodiment of the present application;

[0032] Figure 2 FIG. 2 is a flowchart of the pile bored hole reaming construction method in the embodiment of the present application.

[0033] REFERENCE NUMERALS:

[0034] 1-guide rod; 2-hole expanding rotating plate; 3-end plate ring; 4-end plate support; 5-inner ring; 6-outer ring; 7-inner support; 8-force applying frame.

[0035] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments in conjunction with the accompanying drawings. DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein merely exemplify the application and are not intended to limit the application.

[0037] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0038] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and the directional indications change accordingly when the certain posture changes.

[0039] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope of the application.

[0040] At present, in the related technical field, the traditional hydraulic hole expansion has low efficiency, high cost and complex construction process.

[0041] In order to solve this problem, various embodiments of the bored pile hole expansion drill bit and the bored pile hole expansion construction method are proposed. The bored pile hole expansion drill bit and the bored pile hole expansion construction method provided by the present application adjust the distance between the first hole expansion rotating component and the second hole expansion rotating component by sliding the second hole expansion rotating component which is sleeved on the guide rod preset section, and then control the hole expansion drill bit formed by the plurality of hole expansion rotating plates, so as to adapt to the space under different drilling environments, facilitate the lowering, hole expansion and lifting of the bored pile hole expansion drill bit, and solve the technical problems of low efficiency, high cost, poor hole expansion quality and complex construction process of the current hydraulic hole expansion.

[0042] Reference Figure 1 , Figure 1 The structure diagram of the bored pile hole expansion drill bit involved in the embodiment of the present application is shown.

[0043] The embodiment provides a bored pile reaming drill bit, which comprises a guide rod 1, a first reaming rotating assembly, a second reaming rotating assembly and a plurality of reaming rotating plates 2.

[0044] In the embodiment, the first reaming rotating assembly is fixed at a preset position of the guide rod 1, the second reaming rotating assembly is slidably sleeved on a preset section of the guide rod 1, a first end of the reaming rotating plate 2 is rotationally connected to the first reaming rotating assembly, and a second end of the reaming rotating plate 2 is rotationally connected to the second reaming rotating assembly.

[0045] It should be noted that when the second reaming rotating assembly slides to different positions in the preset section, the plurality of reaming rotating plates 2 jointly form reaming drill bits with different reaming shapes.

[0046] It is easy to understand that the first reaming rotating assembly is fixed to the guide rod 1, and the second reaming rotating assembly is sleeved on the guide rod 1, so that the distance between the first reaming rotating assembly and the second reaming rotating assembly is adjusted by sliding the second reaming rotating assembly, thereby providing the plurality of reaming rotating plates 2 connected between the first reaming rotating assembly and the second reaming rotating assembly with a space for changing the reaming shape.

[0047] Meanwhile, the bored pile reaming drill bit provides two modes, which are:

[0048] A normal state formed by sliding the second reaming rotating assembly away from the first reaming rotating assembly when the bored pile is lowered or lifted, in which the plurality of reaming rotating plates 2 are in a flat state, facilitating lowering and lifting.

[0049] A reaming state formed by sliding the second reaming rotating assembly close to the first reaming rotating assembly when the bored pile is in a reaming position, in which the plurality of reaming rotating plates 2 are in a drill bit state, used for reaming operation of different reaming requirements.

[0050] It should be noted that in actual application, the first reaming rotating assembly can also be arranged in sliding connection with the guide rod 1, so that the first reaming rotating assembly and the second reaming rotating assembly can both realize position adjustment, improving the convenience of the plurality of reaming rotating plates 2 in changing the reaming drill bit into different reaming shapes.

[0051] Further, a locking mechanism is arranged at the sliding connection between the first reaming rotating assembly and the guide rod 1, so as to fix the first reaming rotating assembly when reaming operation is performed.

[0052] In the preferred embodiment, the first reaming rotating assembly comprises an end plate ring 3, an end plate support 4 and a plurality of first reaming rotating shafts.

[0053] In the embodiment, the end plate support 4 is arranged in the ring of the end plate ring 3, connecting the end plate ring 3 and the guide rod 1, so that the end plate ring 3 is fixed at the preset position of the guide rod 1. A plurality of first reaming rotating shafts are arranged outside the ring of the end plate ring 3 and are hingedly connected to the second ends of the corresponding reaming rotating plates 2.

[0054] As can be easily understood, the plurality of first reaming rotating shafts are uniformly arranged outside the ring of the end plate ring 3 and are respectively connected to the plurality of reaming rotating plates 2 one by one, so that each reaming rotating plate 2 is rotated in cooperation with the corresponding first reaming rotating shaft to adjust the reaming shape when the reaming operation is performed.

[0055] It should be noted that the end plate support 4 can be arranged as an end plate support 4 rod or an end plate support 4 plate. If the cast-in-place pile reaming drill bit is provided with a large number of reaming rotating plates 2, it can be arranged as an end plate support 4 plate. If the cast-in-place pile reaming drill bit is provided with a small number of reaming rotating plates 2, a corresponding number of end plate support 4 rods can be arranged for the first reaming rotating shafts corresponding to each reaming rotating plate 2.

[0056] In the preferred embodiment, the second reaming rotating assembly includes an inner ring 5, an outer ring 6, and an inner support 7.

[0057] In the embodiment, the inner ring 5 is slidingly sleeved on the preset section of the guide rod 1. The outer ring 6 is provided with a plurality of second reaming rotating shafts outside the ring, and the plurality of second reaming rotating shafts are hingedly connected to the first ends of the corresponding reaming rotating plates 2. The inner support 7 is arranged inside the ring of the outer ring 6, connecting the inner ring 5 and the outer ring 6, so that the outer ring 6 slides with the inner ring 5.

[0058] As can be easily understood, the inner ring 5 can slide on the preset section of the guide rod 1, and the outer ring 6 and the second reaming rotating shafts arranged outside the ring of the outer ring 6 are driven by the inner support 7 to adjust the distance between the first reaming rotating assembly and the second reaming rotating assembly, finally completing the switching between the normal state and the reaming state, different reaming shapes, to adapt to different reaming workspaces and reaming requirements.

[0059] It should be noted that, like the end plate support 4, the inner support 7 can also be arranged as an inner support 7 rod or an inner support 7 plate. If the cast-in-place pile reaming drill bit is provided with a large number of reaming rotating plates 2, it can be arranged as an end plate support 4 plate. If the cast-in-place pile reaming drill bit is provided with a small number of reaming rotating plates 2, a corresponding number of end plate support 4 rods can be arranged for the second reaming rotating shafts corresponding to each reaming rotating plate 2.

[0060] In the preferred embodiment, the reaming rotating plate 2 includes a first rotating plate, a second rotating plate, and a third rotating shaft.

[0061] In the embodiment, the first end of the first rotating plate is connected to the first reaming rotating assembly, and the second end of the first rotating plate is hingedly connected to the third rotating shaft; the first end of the second rotating plate is connected to the second reaming rotating assembly, and the second end of the second rotating plate is hingedly connected to the third rotating shaft.

[0062] It is easy to understand that the reaming rotating plate 2 realizes the switching of the shape of the reaming rotating plate 2 through the third rotating shaft between the first rotating plate and the second rotating plate inside the reaming rotating plate 2, the first rotating shaft connecting the first rotating plate and the first reaming rotating assembly, and the second rotating shaft connecting the second rotating plate and the second reaming rotating assembly, thereby controlling the working state of the cast-in-place pile reaming drill bit.

[0063] In another preferred embodiment, the cast-in-place pile reaming drill bit further comprises a force applying frame 8 arranged on the second reaming rotating assembly.

[0064] In the embodiment, the force applying frame 8 drives the second reaming rotating assembly to slide in the preset section of the guide rod 1 to control the reaming shape of the reaming drill bit.

[0065] It is easy to understand that the force applying frame 8 controls the distance between the second reaming rotating assembly and the first reaming rotating assembly by applying a downward or upward torque to the second reaming rotating assembly, thereby adjusting the reaming shape formed by the reaming rotating plate 2 connecting the second reaming rotating assembly and the first reaming rotating assembly to adapt to different reaming requirements in different reaming scenarios.

[0066] Further, the force applying frame 8 comprises a force receiving part and a force applying part.

[0067] The force receiving part is used to connect the cast-in-place pile drilling equipment and provide the required torque for reaming, and the force applying part is connected to the force receiving part and the second reaming rotating assembly and is used to drive the second reaming rotating assembly to perform reaming actions according to the torque received.

[0068] Specifically, the force receiving part can be arranged in a threaded structure of the guide rod 1, which can cooperate with a corresponding threaded structure of the cast-in-place pile drilling equipment to provide a torque in the vertical downward and horizontal rotation directions for the force applying frame 8, thereby conducting the torque to the reaming drill bit formed by the reaming rotating plate 2 through the force applying part to drive the cast-in-place pile reaming drill bit to protrude in the direction to be reamed, and at the same time, to rotate the entire cast-in-place pile reaming drill bit in the position to be reamed, thereby improving the reaming efficiency.

[0069] Specifically, the force applying part can be arranged on the outer ring 6 of the second reaming rotating assembly, and when receiving the torque conducted by the force receiving part, the torque is conducted to the reaming drill bit formed by the reaming rotating plate 2.

[0070] Referring to Figure 2 , Figure 2 The flowchart of the cast-in-place pile reaming construction method involved in the embodiment of the present application is shown.

[0071] The embodiment provides a bored pile reaming construction method, which comprises the following steps:

[0072] S100: a bored pile reaming bit in a normal mode is lowered and moved to a position to be reamed.

[0073] It is easily understood that after the bored pile drilling is performed to the position of the designed branch plate, the normal drilling bit is replaced by the bored pile reaming bit as recorded in the foregoing embodiment, the drill rod is connected with the force frame through threads, the bored pile reaming bit is lowered to the designed branch plate position, i.e. the position to be reamed.

[0074] It should be noted that when the bored pile reaming bit is lowered, the bored pile reaming bit keeps the normal mode, the normal mode is that the distance between the first reaming rotating assembly and the second reaming rotating assembly of the bored pile reaming bit is at the farthest, so that the plurality of reaming rotating plates are in the flat state, thereby facilitating the lowering of the bored pile reaming bit.

[0075] S200: the bored pile reaming bit in the reaming mode is driven to perform a reaming action at the position to be reamed until the reaming is completed, and the bored pile reaming bit is switched back to the normal mode from the reaming mode.

[0076] It is easily understood that the pressure is slowly applied to the force frame through the drill rod and the reaming bit is rotated, under the pressure of the force frame, the inner ring slides downward along the guide rod, the reaming rotating plate is slowly opened, in the process of opening and rotating, the soil around the reaming bit is gradually cut off, after the rotating plate is completely opened, an enlarged cavity is formed at the position, the reaming action is completed, and the enlarged cavity forms a branch plate meeting the requirements after the concrete is poured.

[0077] It should be noted that when the reaming action is performed, the bored pile reaming bit keeps the reaming mode, the reaming mode is that the distance between the first reaming rotating assembly and the second reaming rotating assembly of the bored pile reaming bit is at the non-farthest, so that the plurality of reaming rotating plates are in the bit state, thereby facilitating the bored pile reaming bit to perform the reaming action.

[0078] It is easily understood that the distance between the first reaming rotating assembly and the second reaming rotating assembly of the bored pile reaming bit is gradually shortened, so that the plurality of reaming rotating plates together form the reaming bit which is convex to the position to be reamed.

[0079] S300: the bored pile reaming bit in the normal mode is lifted and moved out of the position where the reaming is completed.

[0080] It is easy to understand that after completing a reaming operation, the inner ring slides upward through the drill rod lifting force frame, the rotating plate is completely closed, the reaming drill bit is replaced by a conventional drilling drill bit, drilling continues, and the drilling reaches the position of the next designed prop disc. The above construction process is repeated to complete another enlarged cavity. After the bored pile drilling reaches the designed hole depth, the above construction process is repeated to construct a pile end enlarged cavity. Then, the hole is cleaned, the reinforcement cage is lowered, and the concrete is poured according to the normal construction process of the bored pile. After the concrete solidifies, a prop disc is formed at each enlarged cavity position, and an enlarged head is formed at the pile end position, which can greatly improve the single pile uplift and compression bearing capacity.

[0081] In the embodiment, a bored pile reaming drill bit and a bored pile reaming construction method are provided. The second reaming rotating assembly is slidably sleeved on the guide rod preset section. The distance between the first reaming rotating assembly and the second reaming rotating assembly is adjusted, and then the reaming drill bit formed by the plurality of reaming rotating plates is controlled to adapt to the space in different drilling environments, facilitating the lowering, reaming, and lifting of the bored pile reaming drill bit, and solving the technical problems of low hydraulic reaming efficiency, high cost, and complex construction process.

[0082] The above is only a preferred embodiment of the invention, and does not limit the patent scope of the invention. Any equivalent structure or equivalent process transformation using the content of the invention specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the invention.

Claims

1. A borehole reamer for a cast-in-place pile, characterized in that, The application relates to a cast-in-place pile reaming drill bit. The cast-in-place pile reaming drill bit comprises a guide rod, a first reaming rotation assembly fixed at a preset position of the guide rod, a second reaming rotation assembly slidably sleeved on a preset section of the guide rod, and a plurality of reaming rotation plates. The first reaming rotation assembly comprises an end plate ring and an end plate support arranged in the ring of the end plate ring and connecting the end plate ring and the guide rod so that the end plate ring is fixed at the preset position of the guide rod. The second reaming rotation assembly comprises an inner ring slidably sleeved on the preset section of the guide rod, an outer ring, and an inner support arranged in the ring of the outer ring and connecting the inner ring and the outer ring so that the outer ring slides along with the inner ring. The outer ring is provided with a plurality of second reaming rotation shafts outside the ring, and the plurality of second reaming rotation shafts are hingedly connected with first ends of corresponding reaming rotation plates. The reaming rotation plates are hingedly connected with second ends of the corresponding reaming rotation plates. When the second reaming rotation assembly slides to different positions in the preset section, the plurality of reaming rotation plates jointly form reaming drill bits with different reaming shapes. The cast-in-place pile reaming drill bit further comprises a force applying frame arranged on the second reaming rotation assembly. The force applying frame drives the second reaming rotation assembly to slide on the preset section of the guide rod to control the reaming shape of the reaming drill bit.

2. A pile socketing drill bit as claimed in claim 1, wherein, The force applying frame comprises a force receiving part and a force applying part.

3. A method of bored pile reaming construction, characterized by, The force receiving part is arranged on a threaded structure of the guide rod and is connected with a cast-in-place pile drilling device to provide a required torque for reaming. The force applying part is connected with the force receiving part and the second reaming rotation assembly and drives the second reaming rotation assembly to perform a reaming action according to the received torque. The force applying part is arranged on the outer ring of the second reaming rotation assembly. The reaming action of the second reaming rotation assembly comprises protruding the cast-in-place pile reaming drill bit towards a reaming direction and rotating the entire cast-in-place pile reaming drill bit in a reaming position. The reaming rotation plate comprises a first reaming rotation plate, a second reaming rotation plate, and a third reaming rotation shaft. The first end of the first reaming rotation plate is connected with the first reaming rotation assembly, the second end of the first reaming rotation plate is hingedly connected with the third reaming rotation shaft, the first end of the second reaming rotation plate is connected with the second reaming rotation assembly, and the second end of the second reaming rotation plate is hingedly connected with the third reaming rotation shaft. The method comprises the following steps: Lowering the cast-in-place pile reaming drill bit in a normal mode to a reaming position; Driving the cast-in-place pile reaming drill bit in a reaming mode to perform a reaming action in the reaming position until reaming is completed, and switching the cast-in-place pile reaming drill bit from the reaming mode back to the normal mode; Lifting the cast-in-place pile reaming drill bit in the normal mode out of the reaming position. The regular mode is that the distance between the first reaming rotating component and the second reaming rotating component of the cast-in-place pile reaming drill bit is the farthest, so that the several reaming rotating plates are in a flat state; the reaming mode is that the distance between the first reaming rotating component and the second reaming rotating component of the cast-in-place pile reaming drill bit is not the farthest, so that the several reaming rotating plates are in a drill bit state; The reaming action is that the distance between the first reaming rotating component and the second reaming rotating component of the cast-in-place pile reaming drill bit is gradually shortened, so that the reaming drill bit composed of the several reaming rotating plates is protruded to the direction of the reaming to be performed.

4. The method of claim 3, wherein the method further comprises: The method further comprises: driving the cast-in-place pile reaming drill bit in the reaming mode by using the cast-in-place pile drilling equipment to perform the reaming action at the position to be reamed.

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