Precast pile guide hole drill bit and machining method thereof

Abstract

The invention discloses a precast pile guide hole drill bit and a machining method thereof.The precast pile guide hole drill bit comprises a drill bit body, plate bodies are annularly distributed on the inner side of the drill bit body, and every two adjacent plate bodies are matched to form a flow guide groove; the sealing device is connected to the lower portion of the drill bit body through a center pipe, longitudinal reinforcing ribs are annularly and evenly distributed between the sealing device and the drill bit body, and a plurality of crushing rods are arranged on the outer side faces of the longitudinal reinforcing ribs; the starting end of the spiral reinforcing rib is connected to the sealing device and spirally ascends upwards to the drill bit body along the inner wall of the longitudinal reinforcing rib, and the central pipe is connected to the spiral reinforcing rib through the transverse reinforcing rib. According to the method, lower-layer soil can be effectively prevented from being brought out of a construction area in the hole guiding process, soil scraps and liquid can be brought out together, a construction site is kept clean and tidy, the cleaning difficulty and cost of the construction site are reduced, the inserting and driving precision and construction efficiency of follow-up precast piles are improved, and it is guaranteed that precast pile construction is conducted smoothly.

Description

Technical Field

[0001] This invention relates to a precast pile borehole drill bit and its processing method. Background Technology

[0002] When constructing precast piles, if the soil is hard, a pre-drilling process is usually adopted. However, traditional pre-drilling methods, such as long spiral pre-drilling machines and excavators loaded with ordinary long spirals, have many drawbacks. Especially in construction environments such as soft soil foundations, they can easily bring the outer layer of soil out of the hole, resulting in the construction site being filled with silt. This not only increases the difficulty and cost of cleaning the construction site, but may also affect the subsequent driving accuracy and construction precision of the precast piles, thus limiting the further development of precast pile construction technology. Summary of the Invention

[0003] The purpose of this invention is to provide a technical solution for a precast pile pre-drilling bit and its processing method to address the shortcomings of existing technologies. This bit can not only effectively prevent the lower soil from being brought out of the construction area during the pre-drilling process, but also facilitate the removal of soil debris and liquids together, keeping the construction site clean, reducing the difficulty and cost of cleaning the construction site, improving the subsequent driving accuracy and construction efficiency of precast piles, and ensuring the smooth progress of precast pile construction.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A precast pile pre-hole drill bit, characterized in that: it includes...

[0006] The drill bit body has plates arranged in a ring on its inner side, and adjacent plates cooperate to form a guide groove.

[0007] The sealing device is connected to the bottom of the drill bit body through the central tube. There are longitudinal reinforcing ribs evenly distributed in a ring between the sealing device and the drill bit body. Several breaking rods are provided on the outer side of the longitudinal reinforcing ribs. The drill bit body, longitudinal reinforcing ribs and sealing device work together to form a conical structure.

[0008] The drill bit features a spiral reinforcing rib, with its starting end connected to a sealing device and spiraling upwards along the inner wall of the longitudinal reinforcing rib to the drill bit body. The central tube is connected to the spiral reinforcing rib via a transverse reinforcing rib. This drill bit not only effectively prevents the lower soil layer from being carried out of the construction area during the pilot hole drilling process, but also facilitates the removal of soil debris and liquids, keeping the construction site clean, reducing the difficulty and cost of site cleanup, improving the subsequent driving accuracy and construction efficiency of precast piles, and ensuring the smooth progress of precast pile construction.

[0009] Furthermore, the drill bit body has a circular ring structure, and cutting blades are provided on the outer circumferential side of the drill bit body. The cutting blades are distributed radially and can be made of cemented carbide material. They can be triangular or arc-shaped cutting edges, which can efficiently cut the soil layer when the drill bit rotates, making the soil granulated, reducing the generation of large soil pieces, and thus reducing the possibility of soil being carried out.

[0010] Furthermore, a reinforcing rib is provided between the cutting blade and the drill bit body. The reinforcing rib has an arc or triangular structure, which not only enhances the connection strength between the cutting blade and the drill bit body, but also plays a certain role in guiding the soil. It guides the cut soil chips and prevents soil chips from accumulating between the cutting blade and the drill bit body, ensuring that the cutting blade maintains good cutting performance.

[0011] Furthermore, the guide channel has a spiral structure. This spiral design not only guides the flow of mud or cutting fluid in the hole and removes the cutting debris from the hole in a timely manner, but also generates a certain upward force when the drill bit rotates, which helps to prevent the lower soil layers from being carried out.

[0012] Furthermore, the drill bit body is provided with a guide hole, and the inner side of the spiral reinforcing rib is a guide channel with an opening. The guide channel is connected to the guide hole, which is conducive to the discharge of soil debris and liquid along the guide channel through the guide hole, thereby reducing the impact on the soil.

[0013] Furthermore, the sealing device is equipped with a first central channel and a liquid outlet groove. The liquid outlet groove is connected to the central pipe through the first central channel. A column is provided inside the liquid outlet groove. A cavity is provided between the first central channel and the liquid outlet groove. A movable plug is movably connected inside the cavity. The movable plug is used to control the opening and closing between the first central channel and the liquid outlet groove. With the design of the above structure, mud or cutting fluid can be injected while the drill bit is rotating, so that the mud or cutting fluid pushes open the movable plug and flows into the hole through the liquid outlet groove, carrying away the soil and debris.

[0014] Furthermore, the inner diameter of the cavity is larger than the inner diameter of the first central channel. A spring is provided on the side of the cavity away from the first central channel. The spring is connected to the movable plug. A sealing ring is provided between the movable plug and the inner wall of the cavity. When the injection of mud or cutting fluid stops, the movable plug moves upward under the action of the spring, separating the first central channel from the liquid outlet tank and preventing soil debris from entering the grouting system.

[0015] Furthermore, the center of the drill bit body is located on the top surface of the plate and has a joint. The joint has a second central channel that connects to the central tube, and the joint has an annular groove.

[0016] Furthermore, a first positioning hole is provided on the bottom surface of the drill bit body, and a second positioning hole is provided on the sealing device. The top and bottom ends of the longitudinal reinforcing rib are welded into the first positioning hole and the second positioning hole, respectively, to improve the connection stability and strength between the longitudinal reinforcing rib and the drill bit body and the sealing device.

[0017] The above-mentioned method for processing a precast pile pilot hole drill bit is characterized by including the following steps:

[0018] S1. Drill bit body machining

[0019] a. First, determine the dimensions of the drill bit body according to the design requirements, process the corresponding drill bit body, and open the guide hole at an angle from the top surface to the bottom surface of the drill bit body. At the same time, open the first positioning hole evenly from the bottom surface of the drill bit body.

[0020] b. Then, plates are evenly installed on the inner side of the drill bit body, and two adjacent plates cooperate to form a guide groove, which has a spiral structure.

[0021] c. Next, the cutting blades are installed along the outer circumference of the drill bit body. The cutting blades are distributed radially, and reinforcing ribs are installed between the cutting blades and the outer side of the drill bit body.

[0022] d. Finally, install the connector on the top surface of the plate along the center of the drill bit body. The connector has a second central channel vertically in the center and an annular groove is opened along the top of the connector.

[0023] S2, Sealing device processing

[0024] a. First, determine the size of the sealing device according to the design requirements, and vertically open the first central channel along the center of the top surface of the sealing device. At the same time, horizontally open the liquid outlet groove along the side of the sealing device so that the liquid outlet groove is connected to the first central channel. Vertically install the column in the liquid outlet groove.

[0025] b. Then, a cavity is opened at the connection between the first central channel and the liquid outlet tank, so that the inner diameter of the cavity is larger than the inner diameter of the first central channel. Then, a movable plug is installed inside the cavity, and the bottom surface of the movable plug is connected to the bottom surface of the cavity by a spring. A sealing ring is installed along the inner wall of the cavity.

[0026] c. Next, evenly open the second positioning holes on the top surface of the sealing device;

[0027] d. Finally, select a center tube of appropriate size according to the design requirements and connect the top of the center tube to the second center channel;

[0028] S3, spiral reinforcing rib installation

[0029] a. First, determine the size of the spiral reinforcing rib based on the distance between the sealing device and the drill bit body, process the corresponding spiral reinforcing rib, and open a flow channel along the inner side of the spiral reinforcing rib. The flow channel runs through the inner side of the spiral reinforcing rib.

[0030] b. Then, install transverse reinforcing ribs at equal intervals from top to bottom along the outer side of the central tube, with the length of the transverse reinforcing ribs decreasing from top to bottom.

[0031] c. Next, the processed spiral reinforcing ribs are fitted onto the outside of the central tube from bottom to top, so that the outlet end of the spiral reinforcing ribs is connected to the guide hole, and each transverse reinforcing rib is welded and fixed to the spiral reinforcing rib.

[0032] S4, Installation of longitudinal reinforcing ribs

[0033] a. First, process the required longitudinal reinforcing ribs according to the distance between the sealing device and the drill bit body, and weld the breaking rod along the outer side of each longitudinal reinforcing rib;

[0034] b. Then, insert the top ends of the processed longitudinal reinforcing ribs into the first positioning holes on the bottom surface of the drill bit body, and then weld them in place.

[0035] c. After all longitudinal reinforcing ribs and the drill bit body are installed, connect the sealing device to the bottom of the central tube so that the first central channel is connected to the central tube. Insert the bottom of each longitudinal reinforcing rib into the corresponding second positioning hole for welding. Then weld the bottom of the spiral reinforcing rib to the top surface of the sealing device for fixation.

[0036] d. Finally, weld and fix each longitudinal reinforcing rib to the outer wall of the spiral reinforcing rib;

[0037] S5. Drilling Construction

[0038] a. Install the processed drill bit at the end of the excavator's robotic arm. According to the design requirements of the precast pile, operate the excavator to align the drill bit with the pile position, start the excavator's hydraulic system, and make the drill bit rotate and gradually sink to carry out the pilot hole operation.

[0039] b. Start the grouting system and inject the cutting fluid or mud into the hole through the second central channel, central pipe and first central channel of the drill bit. The liquid carrying soil debris moves upward through the guide channel inside the spiral reinforcing rib and is discharged through the guide hole. At the same time, the guide channel with spiral structure will also discharge the liquid carrying soil debris and lead it out of the construction area.

[0040] c. Once the borehole depth reaches the design requirements, stop rotating the drill bit, operate the excavator to lift the drill bit out of the hole, and then proceed with the driving of the precast piles.

[0041] This processing method is simple in steps. Not only can cutting fluid or mud be injected into the bottom of the hole during the drilling process to flush up the cut soil chips, but the soil chips and mud or cutting fluid can also rise along the guide groove and guide channel and be discharged out of the hole, achieving efficient discharge of soil chips and preventing the accumulation of soil chips in the hole from affecting the drilling progress and quality.

[0042] The present invention, by adopting the above-described technical solution, has the following beneficial effects:

[0043] 1. The drill bit can not only effectively prevent the lower soil from being brought out of the construction area during the pre-drilling process, but also help to bring out soil debris and liquids together, keep the construction site clean, reduce the difficulty and cost of cleaning the construction site, improve the subsequent driving accuracy and construction efficiency of precast piles, and ensure the smooth progress of precast pile construction.

[0044] 2. The processing method of the present invention has simple steps. Not only can cutting fluid or mud be injected into the bottom of the hole during the drilling process to flush up the cut soil chips, but the soil chips and mud or cutting fluid can also rise along the guide groove and guide channel and be discharged out of the hole, so as to achieve efficient discharge of soil chips and prevent the accumulation of soil chips in the hole from affecting the drilling progress and quality. Attached Figure Description

[0045] The present invention will be further described below with reference to the accompanying drawings:

[0046] Figure 1 This is an effect diagram of the drill bit used in the precast pile pre-hole drill bit and its processing method according to the present invention;

[0047] Figure 2 This is a schematic diagram of the spiral reinforcing ribs in this invention;

[0048] Figure 3 This is a schematic diagram showing the connection between the sealing device and the drill bit body in this invention;

[0049] Figure 4 This is a schematic diagram of the sealing device in this invention;

[0050] Figure 5 This is a schematic diagram of the connector structure in this invention;

[0051] Figure 6 This is a flowchart of the processing method in this invention.

[0052] Wherein: 1-Drill bit body; 2-Central tube; 3-Sealing device; 4-Longitudinal reinforcing rib; 5-Breaker rod; 6-Helical reinforcing rib; 7-Plate body; 8-Guide groove; 9-Cutting blade; 10-Guide hole; 11-Guide channel; 12-Transverse reinforcing rib; 13-First central channel; 14-Liquid outlet groove; 15-Column; 16-Cavity; 17-Moving plug; 18-Spring; 19-Sealing ring; 20-First positioning hole; 21-Second positioning hole; 22-Connector; 23-Second central channel; 24-Annular groove. Detailed Implementation

[0053] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0054] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0055] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0056] like Figures 1 to 5 As shown, this invention provides a precast pile pre-hole drill bit, comprising a drill bit body 1, a sealing device 3, and a spiral reinforcing rib 6.

[0057] The inner side of the drill bit body 1 has plates 7 arranged in a ring, and two adjacent plates 7 cooperate to form a guide groove 8.

[0058] The drill bit body 1 has a circular structure. Cutting blades 9 are provided on the outer circumferential side of the drill bit body 1. The cutting blades 9 are distributed radially. The cutting blades 9 can be made of hard alloy material and can be triangular or arc-shaped cutting edges. They can efficiently cut the soil layer when the drill bit rotates, making the soil granulated, reducing the generation of large soil pieces, and thus reducing the possibility of soil being carried out.

[0059] A reinforcing rib is provided between the cutting blade 9 and the drill bit body 1. The reinforcing rib has an arc or triangular structure, which can not only enhance the connection strength between the cutting blade 9 and the drill bit body 1, but also play a certain role in guiding the soil. It guides the soil chips after cutting and avoids the soil chips from accumulating between the cutting blade 9 and the drill bit body 1, ensuring that the cutting blade 9 maintains good cutting performance.

[0060] The guide channel 8 has a spiral structure. The spiral structure of the guide channel 8 can not only guide the flow of mud or cutting fluid in the hole and discharge the soil chips generated by cutting in time, but also generate a certain upward force when the drill bit rotates, which helps to prevent the lower soil from being carried out.

[0061] The center of the drill bit body 1 is located on the top surface of the plate 7 and a joint 22 is provided. The joint 22 has a second central channel 23, which connects to the central tube 2. The joint 22 has an annular groove 24.

[0062] The sealing device 3 is connected to the lower part of the drill bit body 1 through the central tube 2. The sealing device 3 and the drill bit body 1 are evenly distributed in a ring with longitudinal reinforcing ribs 4. Several breaking rods 5 are provided on the outer side of the longitudinal reinforcing ribs 4. The drill bit body 1, the longitudinal reinforcing ribs 4 and the sealing device 3 cooperate to form a conical structure.

[0063] The bottom surface of the drill bit body 1 is provided with a first positioning hole 20, and the sealing device 3 is provided with a second positioning hole 21. The top and bottom ends of the longitudinal reinforcing rib 4 are respectively welded into the first positioning hole 20 and the second positioning hole 21, thereby improving the connection stability and strength between the longitudinal reinforcing rib 4 and the drill bit body 1 and the sealing device 3.

[0064] The sealing device 3 is provided with a first central channel 13 and a liquid outlet 14. The liquid outlet 14 is connected to the central pipe 2 through the first central channel 13. A column 15 is provided in the liquid outlet 14. A cavity 16 is provided between the first central channel 13 and the liquid outlet 14. A movable plug 17 is movably connected in the cavity 16. The movable plug 17 is used to control the opening and closing between the first central channel 13 and the liquid outlet 14. With the design of the above structure, mud or cutting fluid can be injected while the drill bit is rotating, so that the mud or cutting fluid pushes the movable plug 17 open and flows into the hole through the liquid outlet 14, carrying away the soil and debris.

[0065] The inner diameter of the cavity 16 is larger than the inner diameter of the first central channel 13. A spring 18 is provided inside the cavity 16 on the side away from the first central channel 13. The spring 18 is connected to the movable plug 17. A sealing ring 19 is provided between the movable plug 17 and the inner wall of the cavity 16. When the injection of mud or cutting fluid is stopped, the movable plug 17 moves upward under the action of the spring 18, separating the first central channel 13 from the liquid outlet 14 to prevent soil debris from entering the grouting system.

[0066] The starting end of the spiral reinforcing rib 6 is connected to the sealing device 3, and spirals upward along the inner wall of the longitudinal reinforcing rib 4 to the drill bit body 1. The central tube 2 is connected to the spiral reinforcing rib 6 through the transverse reinforcing rib 12.

[0067] The drill bit body 1 is provided with a guide hole 10, and the inner side of the spiral reinforcing rib 6 is a guide channel 11 with an opening. The guide channel 11 is connected to the guide hole 10, which is conducive to the discharge of soil debris and liquid along the guide channel 11 through the guide hole 10, thereby reducing the impact on the soil.

[0068] This drill bit not only effectively prevents the lower soil from being carried out of the construction area during the pre-drilling process, but also helps to carry out soil debris and liquids together, keeping the construction site clean, reducing the difficulty and cost of cleaning the construction site, improving the driving accuracy and construction efficiency of subsequent precast piles, and ensuring the smooth progress of precast pile construction.

[0069] like Figure 6 The diagram illustrates a method for processing a precast pile borehole drill bit according to the present invention, comprising the following steps:

[0070] S1, Drill bit body 1 machining

[0071] a. First, determine the size of the drill body 1 according to the design requirements, process the corresponding drill body 1, and open the guide hole 10 at an angle from the top surface to the bottom surface of the drill body 1. At the same time, open the first positioning hole 20 evenly from the bottom surface of the drill body 1.

[0072] b. Then, plates 7 are evenly installed on the inner side of the drill bit body 1, and two adjacent plates 7 cooperate to form a guide groove 8, which has a spiral structure.

[0073] c. Next, the cutting blades 9 are installed along the outer circumference of the drill bit body 1. The cutting blades 9 are radially distributed, and reinforcing ribs are installed between the cutting blades 9 and the outer side of the drill bit body 1.

[0074] d. Finally, install the connector 22 on the top surface of the plate 7 along the center of the drill bit body 1. The connector 22 has a second central channel 23 vertically in the center and an annular groove 24 is opened along the top of the connector 22.

[0075] S2, Sealing device 3 processing

[0076] a. First, determine the size of the sealing device 3 according to the design requirements, and vertically open the first central channel 13 along the center of the top surface of the sealing device 3. At the same time, horizontally open the liquid outlet groove 14 along the side of the sealing device 3 so that the liquid outlet groove 14 is connected to the first central channel 13. Vertically install the column 15 in the liquid outlet groove 14.

[0077] b. Then, a cavity 16 is opened at the connection between the first central channel 13 and the liquid outlet 14, so that the inner diameter of the cavity 16 is larger than the inner diameter of the first central channel 13. Then, a movable plug 17 is installed inside the cavity 16, and the bottom surface of the movable plug 17 is connected to the bottom surface of the cavity 16 by a spring 18. A sealing ring 19 is installed along the inner wall of the cavity 16.

[0078] c. Next, evenly open the second positioning holes 21 on the top surface of the sealing device 3;

[0079] d. Finally, select a central tube 2 of appropriate size according to the design requirements and connect the top end of the central tube 2 to the second central channel 23;

[0080] S3, spiral reinforcing rib 6 installation

[0081] a. First, determine the size of the spiral reinforcing rib 6 according to the distance between the sealing device 3 and the drill bit body 1, process the corresponding spiral reinforcing rib 6, and open the guide channel 11 along the inner side of the spiral reinforcing rib 6. The guide channel 11 penetrates the inner side of the spiral reinforcing rib 6.

[0082] b. Then, install transverse reinforcing ribs 12 at equal intervals from top to bottom along the outer side of the central tube 2, with the length of the transverse reinforcing ribs 12 decreasing from top to bottom.

[0083] c. Next, the processed spiral reinforcing rib 6 is fitted onto the outside of the central tube 2 from bottom to top, so that the outlet end of the spiral reinforcing rib 6 is connected to the guide hole 10, and each transverse reinforcing rib 12 is welded and fixed to the spiral reinforcing rib 6.

[0084] S4, longitudinal reinforcing rib 4 installation

[0085] a. First, process the required longitudinal reinforcing ribs 4 according to the distance between the sealing device 3 and the drill bit body 1, and weld the breaking rod 5 along the outer side of each longitudinal reinforcing rib 4.

[0086] b. Then, the top ends of the processed longitudinal reinforcing ribs 4 are respectively inserted into the first positioning holes 20 on the bottom surface of the drill bit body 1, and then welded and fixed.

[0087] c. After all the longitudinal reinforcing ribs 4 and the drill bit body 1 are installed, connect the sealing device 3 to the bottom end of the central tube 2 so that the first central channel 13 connects to the central tube 2, and insert the bottom end of each longitudinal reinforcing rib 4 into the corresponding second positioning hole 21 for welding, and then weld the bottom end of the spiral reinforcing rib 6 to the top surface of the sealing device 3 for fixation.

[0088] d. Finally, each longitudinal reinforcing rib 4 is welded and fixed to the outer wall of the spiral reinforcing rib 6;

[0089] S5. Drilling Construction

[0090] a. Install the processed drill bit at the end of the excavator's robotic arm. According to the design requirements of the precast pile, operate the excavator to align the drill bit with the pile position, start the excavator's hydraulic system, and make the drill bit rotate and gradually sink to carry out the pilot hole operation.

[0091] b. Start the grouting system and inject the cutting fluid or mud into the hole through the second central channel 23, central pipe 2 and first central channel 13 of the drill bit from the outlet groove 14. The liquid carrying soil debris moves upward through the guide channel 11 inside the spiral reinforcing rib 6 and is discharged through the guide hole 10. At the same time, the guide groove 8 with spiral structure will also discharge the liquid carrying soil debris and lead it out of the construction area together.

[0092] c. Once the borehole depth reaches the design requirements, stop rotating the drill bit, operate the excavator to lift the drill bit out of the hole, and then proceed with the driving of the precast piles.

[0093] This processing method is simple in steps. Not only can cutting fluid or mud be injected into the bottom of the hole during the drilling process to flush up the cut soil chips, but the soil chips and mud or cutting fluid can also rise along the guide groove 8 and guide channel 11 and be discharged out of the hole, achieving efficient discharge of soil chips and preventing the accumulation of soil chips in the hole from affecting the drilling progress and quality.

[0094] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to achieve substantially the same technical effect are all covered within the protection scope of the present invention.

Claims

1. A precast pile pre-hole drill bit, characterized in that: include The drill bit body has plates arranged in a ring on its inner side, and two adjacent plates cooperate to form a guide groove. A sealing device is connected to the lower part of the drill bit body through a central tube. Longitudinal reinforcing ribs are evenly distributed in a ring between the sealing device and the drill bit body. Several breaking rods are provided on the outer side of the longitudinal reinforcing ribs. The drill bit body, the longitudinal reinforcing ribs and the sealing device cooperate to form a conical structure. The drill bit body is provided with a spiral reinforcing rib, the starting end of which is connected to the sealing device and spirals upward along the inner wall of the longitudinal reinforcing rib to the drill bit body. The central tube is connected to the spiral reinforcing rib via a transverse reinforcing rib.

2. The precast pile pre-hole drill bit according to claim 1, characterized in that: The drill bit body has a circular structure, and cutting blades are provided on the outer circumferential side of the drill bit body. The cutting blades are distributed radially.

3. The precast pile pre-hole drill bit according to claim 2, characterized in that: A reinforcing rib is provided between the cutting blade and the drill bit body.

4. The precast pile pre-hole drill bit according to claim 1, characterized in that: The guide channel has a spiral structure.

5. A precast pile pre-hole drill bit according to claim 1, characterized in that: The drill bit body is provided with a flow guide hole, and the inner side of the spiral reinforcing rib is a flow guide channel with an opening, which is connected to the flow guide hole.

6. A precast pile pre-drilling bit according to claim 1, characterized in that: The sealing device is provided with a first central channel and a liquid outlet groove. The liquid outlet groove is connected to the central tube through the first central channel. A column is provided in the liquid outlet groove. A cavity is provided between the first central channel and the liquid outlet groove. A movable plug is movably connected in the cavity. The movable plug is used to control the opening and closing of the first central channel and the liquid outlet groove.

7. A precast pile pre-hole drill bit according to claim 6, characterized in that: The inner diameter of the cavity is larger than the inner diameter of the first central channel. A spring is provided on the side of the cavity away from the first central channel. The spring is connected to the movable plug. A sealing ring is provided between the movable plug and the inner wall of the cavity.

8. A precast pile pre-hole drill bit according to claim 1, characterized in that: The drill bit body has a connector located at the center of the top surface of the plate. The connector has a second central channel that connects to the central tube. The connector has an annular groove.

9. A precast pile pre-hole drill bit according to claim 1, characterized in that: The bottom surface of the drill bit body is provided with a first positioning hole, the sealing device is provided with a second positioning hole, and the top and bottom ends of the longitudinal reinforcing rib are respectively welded into the first positioning hole and the second positioning hole.

10. A method for processing a precast pile pilot hole drill bit according to any one of claims 1 to 9, characterized in that... Includes the following steps: S1. Drill bit body machining a. First, determine the dimensions of the drill bit body according to the design requirements, process the corresponding drill bit body, and open the guide hole at an angle from the top surface to the bottom surface of the drill bit body. At the same time, open the first positioning hole evenly from the bottom surface of the drill bit body. b. Then, plates are evenly installed on the inner side of the drill bit body, and two adjacent plates cooperate to form a guide groove, which has a spiral structure. c. Next, the cutting blades are installed along the outer circumference of the drill bit body. The cutting blades are distributed radially, and reinforcing ribs are installed between the cutting blades and the outer side of the drill bit body. d. Finally, install the connector on the top surface of the plate along the center of the drill bit body. The connector has a second central channel vertically in the center and an annular groove is opened along the top of the connector. S2, Sealing device processing a. First, determine the size of the sealing device according to the design requirements, and vertically open the first central channel along the center of the top surface of the sealing device. At the same time, horizontally open the liquid outlet groove along the side of the sealing device so that the liquid outlet groove is connected to the first central channel. Vertically install the column in the liquid outlet groove. b. Then, a cavity is opened at the connection between the first central channel and the liquid outlet tank, so that the inner diameter of the cavity is larger than the inner diameter of the first central channel. Then, a movable plug is installed inside the cavity, and the bottom surface of the movable plug is connected to the bottom surface of the cavity by a spring. A sealing ring is installed along the inner wall of the cavity. c. Next, evenly open the second positioning holes on the top surface of the sealing device; d. Finally, select a center tube of appropriate size according to the design requirements and connect the top of the center tube to the second center channel; S3, spiral reinforcing rib installation a. First, determine the size of the spiral reinforcing rib based on the distance between the sealing device and the drill bit body, process the corresponding spiral reinforcing rib, and open a flow channel along the inner side of the spiral reinforcing rib. The flow channel runs through the inner side of the spiral reinforcing rib. b. Then, install transverse reinforcing ribs at equal intervals from top to bottom along the outer side of the central tube, with the length of the transverse reinforcing ribs decreasing from top to bottom. c. Next, the processed spiral reinforcing ribs are fitted onto the outside of the central tube from bottom to top, so that the outlet end of the spiral reinforcing ribs is connected to the guide hole, and each transverse reinforcing rib is welded and fixed to the spiral reinforcing rib. S4, Installation of longitudinal reinforcing ribs a. First, process the required longitudinal reinforcing ribs according to the distance between the sealing device and the drill bit body, and weld the breaking rod along the outer side of each longitudinal reinforcing rib; b. Then, insert the top ends of the processed longitudinal reinforcing ribs into the first positioning holes on the bottom surface of the drill bit body, and then weld them in place. c. After all longitudinal reinforcing ribs and the drill bit body are installed, connect the sealing device to the bottom of the central tube so that the first central channel is connected to the central tube. Insert the bottom of each longitudinal reinforcing rib into the corresponding second positioning hole for welding. Then weld the bottom of the spiral reinforcing rib to the top surface of the sealing device for fixation. d. Finally, weld and fix each longitudinal reinforcing rib to the outer wall of the spiral reinforcing rib; S5. Drilling Construction a. Install the processed drill bit at the end of the excavator's robotic arm. According to the design requirements of the precast pile, operate the excavator to align the drill bit with the pile position, start the excavator's hydraulic system, and make the drill bit rotate and gradually sink to carry out the pilot hole operation. b. Start the grouting system and inject the cutting fluid or mud into the hole through the second central channel, central pipe and first central channel of the drill bit. The liquid carrying soil debris moves upward through the guide channel inside the spiral reinforcing rib and is discharged through the guide hole. At the same time, the guide channel with spiral structure will also discharge the liquid carrying soil debris and lead it out of the construction area. c. Once the borehole depth reaches the design requirements, stop rotating the drill bit, operate the excavator to lift the drill bit out of the hole, and then proceed with the driving of the precast piles.

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