Bidirectional stirring drill bit structure for stirring pile machine and construction method

Abstract

The invention relates to the technical field of mixing pile machines, in particular to a two-way mixing drill bit structure for a mixing pile machine and a construction method.The two-way mixing drill bit structure comprises a sleeve body, and multiple sets of sleeve holes are formed in the outer wall of the sleeve body; a rotary shaking mechanism is arranged in the sleeve body, and an air injection blowing mechanism and a bidirectional rotating mechanism are arranged on the sleeve body; the rotary shaking mechanism comprises sliding grooves formed in the inner wall of the sleeve body and corresponding to the two sides of the sleeve hole, the inner wall of each sliding groove is slidably connected with a lifting plate, a spring is fixedly connected to the position, corresponding to the interior of the corresponding sliding groove, of one end of the outer side of each lifting plate, and each spring is fixedly connected with the corresponding sliding groove. According to the device, a lifting plate can move inwards and outwards, so that a pushing column is driven to do the same movement, soil in a sleeve hole is pushed away, the sleeve hole is prevented from being blocked by the soil, and the flowability of the sleeve hole is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mixing pile machines, in particular to a bidirectional mixing drill bit structure for a mixing pile machine and a construction method. BACKGROUND

[0002] In the fields of building engineering and traffic infrastructure, foundation treatment is a key link to ensure the stability and safety of engineering structures. The mixing pile technology is widely used in foundation pit support, roadbed reinforcement, dam seepage prevention and other scenes because it can effectively improve soft soil foundation and improve foundation bearing capacity. The core working part of the mixing pile machine is the mixing drill bit, and its structural design directly determines the mixing effect of the cement soil and the foundation soil, the construction efficiency and the pile quality, which is a key factor affecting the application effect of the mixing pile technology. The mixing drill bit is driven by an energy-saving motor, and the energy-saving motor refers to an electric motor that significantly reduces energy consumption and improves energy utilization efficiency under the premise of meeting the same or higher performance requirements through optimization design, use of advanced materials and manufacturing processes.

[0003] In actual construction, slurry and soil will enter the sleeve through the hole in the traditional mixing drill bit. When the fluidity of the soil is poor, it will cause blockage of the hole, affecting the flow of the slurry and the entry of the soil, resulting in poor fluidity of the hole, and thus affecting the mixing of the slurry and the soil in the sleeve. Therefore, the uniformity of mixing is poor. In addition, to make up for the problem of insufficient mixing uniformity of the traditional mixer, the mixing time is often extended and the number of drill rod lifts is increased to optimize the mixing effect during construction, resulting in low construction efficiency and high energy consumption. In addition, the blade angle and rotation speed of the traditional mixing drill bit are usually fixed in design and cannot be dynamically adjusted according to the physical and mechanical properties of different strata (such as cohesive soil, sandy soil and miscellaneous fill). SUMMARY

[0004] The purpose of the present application is to solve the problems in the background art and provide a bidirectional mixing drill bit structure for a mixing pile machine and a construction method.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a bidirectional mixing drill bit structure for a mixing pile machine, comprising a sleeve body, a plurality of sleeve holes are formed in the outer wall of the sleeve body, a rotating and shaking mechanism is arranged inside the sleeve body, a gas blowing mechanism and a bidirectional rotating mechanism are arranged on the sleeve body.

[0006] The rotating shaking mechanism includes sliding grooves formed on both sides of the sleeve hole on the inner wall of the sleeve body. Each set of sliding grooves is slidably connected to a lifting plate. A spring is fixedly connected to the inside of the sliding groove at one side of the outer side of each lifting plate. Each set of springs and each set of sliding grooves are fixedly connected. Triangular blocks are fixedly connected to both sides of one side of the inner side of each lifting plate. A push column is fixedly connected to one side of the outer side of each lifting plate at the position corresponding to the sleeve hole.

[0007] The rotating shaking mechanism also includes rollers. When the rollers contact the inclined surface of the triangular block, the lifting plate moves outward and moves the pushing column outward, thereby pushing away the mud blocking the sleeve hole.

[0008] Preferably, the inner wall of the sleeve body is provided with a telescopic groove on the inner side corresponding to the sliding groove, and a protective plate A is provided on the inner wall of each group of telescopic grooves. Each group of protective plates A and each lifting plate are fixedly connected. A protective plate B is fixedly connected to one end of the inner side of the lifting plate corresponding to the position of the protective plate A. The protective plates A and B are used to cover the sliding groove.

[0009] Preferably, the rotating shaking mechanism further includes a fixed plate, and six fixed plates are symmetrically arranged. Each fixed plate has a groove on one side of its outer side, and a rotating shaft is rotatably connected to the inner wall of each groove. Each rotating shaft and each roller are respectively fixedly connected.

[0010] Preferably, each of the lifting plates has a guide post that slides through it, and a limit block is fixedly connected to one end of the inner side of each set of guide posts. Each set of guide posts is fixedly connected to the inner wall of the sleeve body.

[0011] Preferably, the jet blowing mechanism includes an air intake channel opened at one end of the sleeve body, and the number of air intake channels is set to six. Each sleeve hole has an air outlet on both sides of its inner wall, and the air outlet is connected to the air intake channel. An annular connecting shell is rotatably connected to one end of the sleeve body corresponding to the outer side of the air intake channel, and an air intake pipe is fixedly inserted through both sides of one end of the annular connecting shell.

[0012] Preferably, the bidirectional rotation mechanism includes wing bearings fixedly passing through both ends of the sleeve body, a drill rod body fixedly connected to the inner wall of the two wing bearings, the drill rod body fixedly connected to the fixed plate, three inner winglets movably connected to the outer wall of the drill rod body corresponding to the inner side of the fixed plate, and three outer winglets movably connected to the outer wall of the two wing bearings, the inner winglets and outer winglets rotating in opposite directions.

[0013] Preferably, one end of the drill rod body is fixedly connected to an outer wing plate bearing, both ends of the outer wing plate bearing are movably connected to outer wing plate bodies, the two outer wing plate bodies are provided with wing plate end teeth at their respective ends, and multiple uniformly arranged wing plate bottom spraying ports are opened on the two outer wing plate bodies. The end of the outer wing plate bearing away from the sleeve body is fixedly connected to a central drill bit bearing, three central drill bit bodies are fixedly embedded on the central drill bit bearing, and central drill bit cutting teeth are fixedly connected to the three central drill bit bodies.

[0014] Preferably, the central drill bit bearing has a central grouting hole in the middle, the drill rod body has a drill rod grouting channel inside, the outer wing plate bearing has a drill bit grouting channel inside, and both outer wing plate bodies have connecting channels inside. The two connecting channels are connected to the grouting ports at the bottom of the two sets of wing plates, and the central grouting hole, the drill rod grouting channel, and the drill bit grouting channel are connected.

[0015] A construction method for a bidirectional mixing drill bit structure for a mixing pile machine includes the following steps:

[0016] Step 1: First, install the entire mixing drill bit structure on the mixing pile machine. Then, drill into the required pile position through the bidirectional rotating mechanism. During the drilling process, adjust the rotation speed of the bidirectional rotating mechanism to ensure that the slurry and soil are fully mixed.

[0017] Step 2: During drilling, the roller contacts the inclined surface of the triangular block. At this time, the lifting plate moves outward, and the pushing column moves outward, thereby pushing away the mud blocking the sleeve hole and ensuring the entry of slurry and soil.

[0018] Step 3: At the same time, the jet blowing mechanism performs jet blowing operation in the sleeve hole to further ensure the flow of the sleeve hole.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Through the set rotational shaking mechanism, when the drill rod body and the sleeve body rotate, the roller contacts the inclined surface of the triangular block, and under the elastic action of the spring, the lifting plate moves inward and outward, thereby causing the push column to move in the same way, thus pushing away the soil in the sleeve hole, preventing the soil from clogging the sleeve hole, ensuring the fluidity of the sleeve hole, thereby ensuring that the slurry and soil are fully mixed and improving the uniformity of mixing;

[0021] 2. Through the set jet blowing mechanism, gas can be indirectly injected into the annular connecting shell through the air inlet pipe during stirring. Therefore, the gas can be diverted and enter each air inlet channel, and then discharged through the air outlet. This can further disperse the soil in the sleeve hole and ensure the fluidity of the sleeve hole.

[0022] 3. Through the set bidirectional rotation mechanism, the drill rod body and the sleeve body can be rotated in opposite directions by an energy-saving motor. Combined with the cutting of the central drill bit cutting teeth and the precise spraying of solidification materials (cement slurry, cement powder, etc.), a "bidirectional shearing and mixing + uniform material mixing" operation mode is formed. This avoids defects such as insufficient pile strength and poor density caused by uneven or discontinuous mixing, and greatly improves the pile bearing capacity and long-term stability. It is suitable for reinforcement operations of various types of strata from soft soil to hard rock. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a bidirectional mixing drill bit structure and construction method for a mixing pile machine according to the present invention;

[0024] Figure 2 This is another perspective view of the bidirectional mixing drill bit structure and construction method for a mixing pile machine according to the present invention;

[0025] Figure 3 This is a cross-sectional view of the sleeve body of a bidirectional mixing drill bit structure and construction method for a mixing pile machine according to the present invention.

[0026] Figure 4 This is a further sectional view of the sleeve body of a bidirectional mixing drill bit structure and construction method for a mixing pile machine according to the present invention.

[0027] Figure 5 This invention relates to a bidirectional mixing drill bit structure and construction method for a mixing pile machine. Figure 4 Enlarged view of the structure at point A in the middle;

[0028] Figure 6 This is a ring-shaped sectional view of the sleeve body of a bidirectional mixing drill bit structure and construction method for a mixing pile machine according to the present invention.

[0029] Figure 7 This is a structural diagram of a fixing plate for a bidirectional mixing drill bit structure and construction method for a mixing pile machine according to the present invention.

[0030] Figure 8 This is a cross-sectional view of the outer flange bearing of a bidirectional mixing drill bit structure and construction method for a mixing pile machine according to the present invention.

[0031] In the diagram: 1. Sleeve body; 2. Outer wing plate bearing; 3. Wing plate end teeth; 4. Outer wing plate body; 5. Wing plate bottom spray nozzle; 6. Center drill bit bearing; 7. Center spray hole; 8. Center drill bit cutting teeth; 9. Center drill bit body; 10. Sleeve hole; 11. Annular connecting shell; 12. Air inlet pipe; 13. Drill rod spray channel; 14. Drill rod body; 15. Air inlet channel; 16. Roller; 17. Fixing plate; 18. Inner wing plate; 19. Outer wing plate; 20. Limiting block; 21. Guide column; 22. Triangular block; 23. Lifting plate; 24. Push column; 25. Wing plate bearing; 26. Air outlet; 27. Protective plate A; 28. Protective plate B; 29. ​​Sliding groove; 30. Spring; 31. Telescopic groove; 32. Rotating shaft; 33. Groove; 34. Drill bit spray channel; 35. Connecting channel. Detailed Implementation

[0032] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0033] like Figures 1-8 The diagram shows a bidirectional mixing drill bit structure for a mixing pile machine, comprising a sleeve body 1, with a second drive motor connected to the top of the sleeve body 1. This second drive motor is an energy-saving type, thus conserving energy. Multiple sets of sleeve holes 10 are formed on the outer wall of the sleeve body 1. A rotating and vibrating mechanism is installed inside the sleeve body 1, along with an air-blowing mechanism and a bidirectional rotating mechanism. The rotating and vibrating mechanism includes sliding grooves 29 formed on both sides of the sleeve holes 10 on the inner wall of the sleeve body 1. A lifting plate 23 is slidably connected to the inner wall of each sliding groove 29. A spring 30 is fixedly connected to the inner side of the sliding groove 29 at one end of the outer side of each lifting plate 23. Each set of springs 30 and each set of sliding grooves 29 are fixedly connected. A triangular block 22 is fixedly connected to both sides of one end of the inner side of each lifting plate 23. A push column 24 is fixedly connected to the outer side of each lifting plate 23 at the position corresponding to the sleeve hole 10. The rotating shaking mechanism also includes a roller 16. When the roller 16 contacts the inclined surface of the triangular block 22, the lifting plate 23 moves outward and moves the push column 24 outward, thereby pushing away the mud blocking the sleeve hole 10.

[0034] like Figure 4 , Figure 5As shown, the inner wall of the sleeve body 1 is provided with telescopic grooves 31 on the inner side corresponding to the sliding groove 29. Each set of telescopic grooves 31 has a protective plate A27 on its inner wall. Each set of protective plates A27 is fixedly connected to each lifting plate 23. A protective plate B28 is fixedly connected to one end of the inner side of the lifting plate 23 at the position corresponding to the protective plate A27. The protective plates A27 and B28 cover the sliding groove 29. With the cooperation of the protective plates A27 and B28, soil and slurry can be prevented from entering the sliding groove 29 when the lifting plate 23 moves, ensuring the movement distance of the lifting plate 23.

[0035] like Figure 3 , Figure 4 , Figure 7 As shown, the rotating shaking mechanism also includes a fixed plate 17. There are six fixed plates 17 symmetrically arranged. Each fixed plate 17 has a groove 33 on one side of its outer side. A rotating shaft 32 is rotatably connected to the inner wall of each groove 33. Each rotating shaft 32 and each roller 16 are fixedly connected.

[0036] like Figure 3 , Figure 4 As shown, each lifting plate 23 has a guide post 21 that slides through it. A limit block 20 is fixedly connected to one end of the inner side of each set of guide posts 21, and each set of guide posts 21 is fixedly connected to the inner wall of the sleeve body 1. The guide posts 21 can limit the movement of the lifting plate 23, ensuring the stable movement of the lifting plate 23.

[0037] like Figure 3 , Figure 4 , Figure 6 As shown, the jet blowing mechanism includes an air inlet channel 15 at one end of the sleeve body 1. There are six air inlet channels 15. Each sleeve hole 10 has an air outlet 26 on both sides of its inner wall, and the air outlets 26 are connected to the air inlet channels 15. An annular connecting shell 11 is rotatably connected to one end of the sleeve body 1, corresponding to the outer side of the air inlet channel 15. Air inlet pipes 12 are fixedly inserted through both sides of one end of the annular connecting shell 11. Gas is intermittently injected into the annular connecting shell 11 through the air inlet pipes 12 and flows into the air inlet channels 15, then is ejected through the air outlets 26. This further cleans the soil inside the sleeve holes 10, ensuring the flow of slurry and soil.

[0038] like Figure 4As shown, the bidirectional rotation mechanism includes wing bearings 25 fixedly passing through both ends of the sleeve body 1. Drill rod body 14 is fixedly connected to the inner wall of the two wing bearings 25. A drive motor is connected to the top of the drill rod body 14, which is also an energy-saving motor that can save energy. The drill rod body 14 is fixedly connected to the fixed plate 17. Three inner wing plates 18 are movably connected to the outer wall of the drill rod body 14 corresponding to the inner side of the fixed plate 17. Three outer wing plates 19 are movably connected to the outer wall of the two wing bearings 25. The inner wing plates 18 and the outer wing plates 19 rotate in opposite directions. An outer wing plate bearing 2 is fixedly connected to one end of the drill rod body 14. An outer wing plate body 4 is movably connected to both ends of the outer wing plate bearing 2. The installation angles of the outer wing plate body 4, inner wing 18, and outer wing 19 are adjustable, ranging from five to thirty degrees. Similarly, the installation angles of the inner wing 18 and outer wing 19 are opposite, which overcomes the technical defects of traditional mixing drill bits that are "fixed in angle and have poor adaptability". For different strata (such as soft soil, sand, and weathered rock), the cutting resistance and mixing efficiency can be optimized by adjusting the wing angle: a small angle is used in soft soil strata to reduce disturbance, and a large angle is used in hard rock strata to enhance shear force, truly achieving "one drill for multiple uses and adaptability to multiple strata", reducing the frequency of equipment replacement and lowering construction costs.

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 8 As shown, each of the two outer wing plate bodies 4 has wing plate end teeth 3 at one end away from each other. Each of the two outer wing plate bodies 4 has multiple evenly arranged wing plate bottom spray nozzles 5. The outer wing plate bearing 2 is fixedly connected to the end away from the sleeve body 1 with a central drill bit bearing 6. Three central drill bit bodies 9 are fixedly embedded in the central drill bit bearing 6. Each of the three central drill bit bodies 9 is fixedly connected with a central drill bit cutting tooth 8. A central spray hole 7 is opened in the middle of the central drill bit bearing 6. A drill rod spray channel 13 is opened inside the drill rod body 14. A drill bit spray channel 34 is opened inside the outer wing plate bearing 2. A connecting channel 35 is opened inside the two outer wing plate bodies 4. The two connecting channels 35 are connected to the two sets of wing plate bottom spray nozzles 5 respectively. The central spray hole 7, the drill rod spray channel 13 and the drill bit spray channel 34 are connected. The drill rod body 14 and the sleeve body 1 rotate in opposite directions, and together with the central drill bit cutting tooth 8, they can effectively solve the core problems of traditional bidirectional mixing pile machines in hard rock formations, such as "limited use, slow tunneling speed and low construction efficiency". At the same time, it avoids defects such as insufficient pile strength and poor compaction caused by uneven and discontinuous mixing, and greatly improves the pile bearing capacity and long-term stability. It is suitable for reinforcement operations of various types of formations from soft soil to hard rock.

[0040] A construction method for a bidirectional mixing drill bit structure for a mixing pile machine includes the following steps:

[0041] Step 1: First, install the entire mixing drill bit structure on the mixing pile machine. Then, drill into the required pile position through the bidirectional rotating mechanism. During the drilling process, adjust the rotation speed of the bidirectional rotating mechanism to ensure that the slurry and soil are fully mixed.

[0042] Step 2: During drilling, the roller 16 contacts the inclined surface of the triangular block 22. At this time, the lifting plate 23 moves outward and moves the pushing column 24 outward, thereby pushing away the mud blocking the sleeve hole 10 and ensuring the entry of slurry and soil.

[0043] Step 3: At the same time, the jet blowing mechanism performs jet blowing operation in the sleeve hole 10 to further ensure the flow of the sleeve hole 10.

[0044] Working principle: First, drive motor 1 is connected to the top of drill pipe body 14, and drive motor 2 is connected to the top of sleeve body 1. Both drive motors 1 and 2 are energy-saving motors, which can save energy consumption. When drive motors 1 and 2 are started, they drive drill pipe body 14 and sleeve body 1 to rotate in opposite directions respectively. Drill pipe body 14, along with the inner wing 18, rotates clockwise, while sleeve body 1, along with the wing bearing 25 and outer wing 19, rotates counterclockwise. Simultaneously, drill pipe body 14... The outer flange bearing 2 and the central drill bit bearing 6 rotate, while the outer flange bearing 2 rotates the outer flange body 4 and the grouting port 5 at the bottom of the flange. The central drill bit bearing 6 rotates the central drill bit body 9 and the central drill bit cutting teeth 8, causing the drill rod body 14 to drill into the pile bottom at a low speed. At the same time, the grouting pump is used to pump the solidifying material cement slurry, cement powder, etc., along the drill rod grouting channel 13, the drill bit grouting channel 34, and the connecting channel 35 to the grouting port 5 at the bottom of the flange and the central grouting hole 7. After drilling to the designed pile bottom elevation, the drill rod body 14 is lifted to ensure that the grout and cement powder are properly mixed. After the soil is thoroughly mixed, once the drill rod body 14 is raised to the designed pile top elevation, it needs to be drilled again at a low speed to the pile bottom, and then raised at a high speed. During the drilling process, the drill rod body 14 rotates with the fixing plate 17, and the fixing plate 17 rotates with the groove 33, the rotating shaft 32, and the roller 16. When the roller 16 contacts the inclined surface of the triangular block 22, it will rotate on its own, and at the same time, the triangular block 22 moves outward, causing the lifting plate 23 and the pushing column 24 to move outward. Therefore, the soil in the sleeve hole 10 can be pushed out, avoiding damage to the sleeve hole 10. The blockage is prevented, thus ensuring the fluidity of the sleeve hole 10 and allowing the slurry and soil to mix thoroughly, improving the uniformity of the mixing. When the roller 16 leaves the triangular block 22, the lifting plate 23 is automatically reset by the elastic reset action of the spring 30, ensuring subsequent continuous movement. At the same time, gas is indirectly injected into the annular connecting shell 11 through the air inlet pipe 12 and flows into the air inlet channel 15, and then sprayed out through the air outlet 26, which can further clean the soil in the sleeve hole 10 and further ensure the flow of slurry and soil.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A bidirectional mixing drill bit structure for a mixing pile machine, comprising a sleeve body (1), characterized in that: The outer wall of the sleeve body (1) is provided with multiple sets of sleeve holes (10), the sleeve body (1) is provided with a rotating shaking mechanism, and the sleeve body (1) is provided with a jet blowing mechanism and a bidirectional rotating mechanism. The rotating shaking mechanism includes sliding grooves (29) on both sides of the inner wall of the sleeve body (1) corresponding to the sleeve hole (10). Each set of sliding grooves (29) is slidably connected to the inner wall of the inner wall of each set of sliding grooves (29). A spring (30) is fixedly connected to the inner side of each set of sliding grooves (29) at one end of the outer side of each set of lifting plates (23). Each set of springs (30) and each set of sliding grooves (29) are fixedly connected. Triangular blocks (22) are fixedly connected to both sides of the inner side of each set of lifting plates (23). A push column (24) is fixedly connected to the outer side of each set of lifting plates (23) at the position corresponding to the sleeve hole (10). The rotating shaking mechanism also includes a roller (16). When the roller (16) contacts the inclined surface of the triangular block (22), the lifting plate (23) moves outward and moves the pushing column (24) outward, thereby pushing away the mud blocking the sleeve hole (10).

2. The bidirectional mixing drill bit structure for a mixing pile machine according to claim 1, characterized in that: The inner wall of the sleeve body (1) is provided with a telescopic groove (31) on the inner side of the sliding groove (29). Each set of telescopic grooves (31) is provided with a protective plate A (27) on the inner wall. Each set of protective plates A (27) and each lifting plate (23) are fixedly connected. One end of the inner side of the lifting plate (23) is fixedly connected with a protective plate B (28) at the position corresponding to the protective plate A (27). The protective plates A (27) and B (28) are used to cover the sliding groove (29).

3. The bidirectional mixing drill bit structure for a mixing pile machine according to claim 1, characterized in that: The rotating shaking mechanism also includes a fixed plate (17), and six fixed plates (17) are symmetrically arranged. Each fixed plate (17) has a groove (33) on one side of its outer side. Each groove (33) has a rotating shaft (32) rotatably connected to its inner wall. Each rotating shaft (32) and each roller (16) are fixedly connected.

4. The bidirectional mixing drill bit structure for a mixing pile machine according to claim 1, characterized in that: Each of the lifting plates (23) has a guide post (21) that slides through it. Each set of guide posts (21) has a limit block (20) fixedly connected to one end of its inner side. Each set of guide posts (21) is fixedly connected to the inner wall of the sleeve body (1).

5. The bidirectional mixing drill bit structure for a mixing pile machine according to claim 1, characterized in that: The jet blowing mechanism includes an air intake channel (15) opened at one end of the sleeve body (1). There are six air intake channels (15). Each sleeve hole (10) has an air outlet (26) on both sides of its inner wall. The air outlet (26) is connected to the air intake channel (15). An annular connecting shell (11) is rotatably connected to one end of the sleeve body (1) corresponding to the outer side of the air intake channel (15). An air intake pipe (12) is fixedly inserted through both sides of one end of the annular connecting shell (11).

6. The bidirectional mixing drill bit structure for a mixing pile machine according to claim 1, characterized in that: The bidirectional rotation mechanism includes wing bearings (25) fixedly passing through both ends of the sleeve body (1). Drill rod body (14) is fixedly connected to the inner wall of the two wing bearings (25). The drill rod body (14) is fixedly connected to the fixing plate (17). Three inner winglets (18) are movably connected to the outer wall of the drill rod body (14) corresponding to the inner side of the fixing plate (17). Three outer winglets (19) are movably connected to the outer wall of the two wing bearings (25). The rotation directions of the inner winglets (18) and the outer winglets (19) are opposite.

7. The bidirectional mixing drill bit structure for a mixing pile machine according to claim 6, characterized in that: One end of the drill rod body (14) is fixedly connected to an outer wing plate bearing (2), and both ends of the outer wing plate bearing (2) are movably connected to outer wing plate bodies (4). The two outer wing plate bodies (4) are provided with wing plate end teeth (3) at one end away from each other. Multiple uniformly arranged wing plate bottom spraying ports (5) are opened on the two outer wing plate bodies (4). The end of the outer wing plate bearing (2) away from the sleeve body (1) is fixedly connected to a central drill bit bearing (6). Three central drill bit bodies (9) are fixedly embedded on the central drill bit bearing (6). Central drill bit cutting teeth (8) are fixedly connected on the three central drill bit bodies (9).

8. The bidirectional mixing drill bit structure for a mixing pile machine according to claim 7, characterized in that: The central drill bit bearing (6) has a central grouting hole (7) in the middle, the drill rod body (14) has a drill rod grouting channel (13) inside, the outer wing plate bearing (2) has a drill bit grouting channel (34) inside, and the two outer wing plate bodies (4) each have a connecting channel (35) inside. The two connecting channels (35) and the two sets of wing plate bottom grouting ports (5) are respectively connected. The central grouting hole (7), the drill rod grouting channel (13) and the drill bit grouting channel (34) are connected.

9. A construction method for a bidirectional mixing drill bit structure used in a mixing pile machine, characterized in that: The bidirectional mixing drill bit structure for a mixing pile machine according to any one of claims 1-8 includes the following steps: Step 1: First, install the entire mixing drill bit structure on the mixing pile machine. Then, drill into the required pile position through the bidirectional rotating mechanism. During the drilling process, adjust the rotation speed of the bidirectional rotating mechanism to ensure that the slurry and soil are fully mixed. Step 2: During drilling, the roller (16) contacts the inclined surface of the triangular block (22). At this time, the lifting plate (23) moves outward and moves the pushing column (24) outward, thereby pushing away the mud blocking the sleeve hole (10) and ensuring the entry of slurry and soil. Step 3: At the same time, the jet blowing mechanism performs jet blowing operation in the sleeve hole (10) to further ensure the flow of the sleeve hole (10).

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