An elliptical mixing pile construction equipment and a construction method thereof

Abstract

The application discloses an elliptical mixing pile construction equipment and relates to the technical field of mixing pile construction tools.The equipment comprises an operation table, a rack arranged on the top of the operation table, a winch arranged on the operation table at the rear end of the rack, a lifting table arranged horizontally and vertically and slidably arranged at the front end of the rack, a servo motor arranged in the fixing frame, and a hollow rotating rod arranged on the bottom surface of the lifting table; a winding steel rope is wound on the winch; and a drilling mechanism is arranged at the bottom end of the hollow rotating rod; the hollow rotating rod and the drilling mechanism are matched with each other, the inside of the elliptical pile hole can be subjected to lifting type composite spouting operation, the drilling mechanism can perform secondary mixing and spouting on the cement slurry in the pile hole in the process of back lifting and rotating, the uniformity of mixing between the cement slurry liquid spouted for the first time can be improved, and the quality of the formed pile can be further improved.

Description

Technical Field

[0001] This invention relates to the technical field of equipment for mixing pile construction, and in particular to an elliptical mixing pile construction device and its construction method. Background Technology

[0002] With the rapid development of urban construction and the increasing scale of projects, cement-soil mixing pile construction technology is a common construction technique in geotechnical engineering. For example, in the reinforcement of soft soil foundations and the selection of the form of foundation pit cutoff wall, construction units often use cement-soil mixing piles. Currently, there are various types of mixing pile construction machinery on the market, mainly including: single-axis, double-axis, triple-axis, five-axis, and six-axis mixing pile machines, jet grouting pile machines, etc.

[0003] Conventional cement mixing piles are mostly circular in cross-section. The circular cross-section is formed by the upper active drill rod driving the lower drill bit to rotate concentrically. Compared with the irregular cross-section formed by eccentric rotation, the circular cross-sectional area is much smaller than that of the irregular cross-section. Therefore, when used for foundation reinforcement and foundation pit water-stop curtains, the single pile bearing capacity of circular cross-section mixing piles is lower, resulting in low project efficiency, which to some extent delays the construction period and the construction cost is relatively high. Therefore, the above-mentioned technical problems need to be solved. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an elliptical mixing pile construction device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an elliptical mixing pile construction device, comprising an operating platform and a frame horizontally mounted on top of the operating platform. A winch is mounted on the operating platform at the rear end of the frame. A horizontally mounted lifting platform is vertically slidable at the front end of the frame. A fixed frame is mounted on top of the lifting platform, and a lifting ring is installed on top of the fixed frame. A servo motor is installed in the fixed frame. A hollow rotating rod coaxially connected to the servo motor is vertically rotatably mounted on the bottom surface of the lifting platform. A winding steel rope is wound on the winch, and the outer end of the winding steel rope passes through a guide wheel on the frame and is fixedly connected to the lifting ring on the fixed frame. Support rods fixed to the operating platform are installed on both sides of the rear end of the frame. A control box for starting and stopping the winch and servo motor is provided on one side of the rear end of the top surface of the operating platform. A drilling mechanism for mixing pile forming is installed at the bottom end of the hollow rotating rod.

[0006] Preferably, the drilling mechanism includes an elliptical stabilizer horizontally positioned below the bottom of the hollow rotating rod, a drill bit vertically positioned within the inner frame of the elliptical stabilizer, and a Reuleaux triangular frame positioned outside the drill bit and inside the elliptical stabilizer. Multiple vertically placed drilling plates are fixedly connected between the triangular portion of the inner frame of the Reuleaux triangular frame and the drill bit. An elliptical guide groove is formed on the inner wall of the elliptical stabilizer, and the end of the Reuleaux triangular frame movably abuts against the interior of the elliptical guide groove. A longitudinally placed positioning plate is horizontally fixed to the top of the elliptical stabilizer. A through hole is formed on the top surface of the positioning plate, and the through hole is fixedly connected to the hollow rotating rod via a bearing ring. The bottom end of the hollow rotating rod passes through the through hole into the inner frame of the elliptical stabilizer. An eccentric transmission assembly is provided at the top of the drill bit. An impact assembly for breaking obstacles is provided at the bottom of the drill bit.

[0007] Preferably, the bottom surface of the drilling plate is fixed with multiple cutting teeth at equal intervals, and the cutting teeth at the bottom of the three drilling plates are staggered; the drilling plate is provided with a grouting channel communicating with the suction channel, and the bottom of the drilling plate is provided with multiple grout outlet holes communicating with the grouting channel at equal intervals.

[0008] Preferably, the eccentric transmission assembly includes an internal gear ring horizontally fixed to the top of the drill bit, a horizontally arranged motor gear meshing on one side of the internal gear ring, the motor gear being fixedly sleeved on the bottom end of the hollow rotating rod, a suction channel being opened inside the drill bit, a cross rod being horizontally fixed in the middle of the suction channel, a fixed tube being vertically inserted through the bottom surface of the cross rod, and the bottom end of the hollow rotating rod being movably extended into the suction channel; the drill bit is located at the center of the inner frame of the Reuleaux triangle.

[0009] Preferably, the top end of the fixed tube is connected to a connecting hose, the connecting hose extends into the interior of the hollow rotating rod, and an air supply pipe is attached to one inner wall of the hollow rotating rod. The top end of the connecting hose is fixedly connected to the bottom end of the air supply pipe. A rotating air supply seat for connecting the air supply pipe is installed on the top of the hollow rotating rod, and the rotating air supply seat is provided with a connector for connecting to an external air compressor.

[0010] Preferably, the bottom end of the drill bit has two arc-shaped conical plates hinged to both sides by electric hinges, and the bottom ends of the two arc-shaped conical plates each have two semi-circular arc-shaped openings.

[0011] Preferably, the impact assembly includes a limiting block vertically fixed to the bottom end of the fixed tube, an installation cavity opened inside the limiting block, and an anti-detachment plate horizontally disposed inside the installation cavity. An impact pick is vertically fixed to the bottom end of the anti-detachment plate, and the bottom end of the impact pick movably extends out of the installation cavity. A fitting groove that mates with the anti-detachment plate is opened on the inner bottom surface of the installation cavity. A sealing tube is vertically fixed to the top of the anti-detachment plate, and the upper part of the sealing tube is movably inserted into the interior of the fixed tube. An upper vent pipe is horizontally connected to the outer walls on both sides of the upper part of the fixed tube, and the top end of the sealing tube is located below the inner end port of the upper vent pipe.

[0012] Preferably, a sealing sleeve is fitted onto the outer wall of the sealing tube, and the outer wall of the sealing sleeve is in close contact with the inner wall of the fixing tube; a return spring is movably fitted onto the tube body of the sealing tube located inside the installation cavity, the top end of the return spring abuts against the inner top surface of the installation cavity, and the bottom end of the return spring abuts against the top surface of the anti-detachment plate.

[0013] Preferably, the outer ends of the upper air outlet pipes all extend beyond the drill bit and are bent upwards; a lower air outlet pipe is installed on the outer wall of the arc-shaped cone plate; the limiting block is a frustum-shaped structure, and the inclined sidewall of the limiting block abuts against the arc-shaped opening of the arc-shaped cone plate.

[0014] This invention also proposes a construction method for an elliptical mixing pile construction device, comprising the following steps:

[0015] S1. First, before construction, the location and layout are carried out according to the construction drawings, the trench is excavated, and the pile position is measured and laid out. Then, the winch and servo motor are electrically connected to the control box through wires, and the control box is electrically connected to the external control equipment. Next, the air supply base is fixedly connected to the air supply pipe on the external compressor, and cement slurry is prepared according to the water-cement ratio and cement dosage required by the design. The external cement tank is connected to the external compressor. Then, the operating platform is moved to the location where the pile is to be formed.

[0016] S2, then control the winch to unwind the coiled steel rope, causing the fixed frame and lifting platform to descend. At this time, start the servo motor to drive the hollow rotating rod to rotate. The rotation of the hollow rotating rod drives the motor gear to rotate. Through the meshing transmission between the motor gear and one side of the inner ring of the internal gear ring, it is convenient for the drill bit to drive the Reuleaux triangle frame to rotate in an elliptical path within the inner frame of the elliptical centralizer under the action of the elliptical centralizer.

[0017] S3, when the drill bit and Reuleaux triangle frame rotate, the cutting teeth at the bottom of the drill plate can cut up the excess soil at the point, and the elliptical stabilizer follows the drill bit down into the pile hole; then the external air compressor is started to supply the prepared cement slurry into the suction channel of the drill bit through the hollow rotating rod, and the cement slurry enters the spraying channel through the suction channel and is discharged from the outlet hole. This allows the drill bit and Reuleaux triangle frame to rotate and descend in an elliptical path during the descent, so that the cement slurry can fill the formed elliptical pile hole, and the spraying stops when the bottom of the impact pick is 50cm from the ground.

[0018] S4. Then start the winch to drive the lifting platform to rise. During the rise, continue to start the external compressor to supply cement slurry to the drilling mechanism. This facilitates secondary mixing and spraying of slurry during the rising and rotating process of the drilling mechanism and can improve the uniformity of mixing with the cement slurry sprayed at the first time.

[0019] S5, when the drilling mechanism encounters an unknown obstacle during descent, the upper air hole is pushed into the pipe. At this time, the impact pick will abut against the obstacle. The top of the impact pick will drive the anti-detachment plate inside the mounting cavity to compress the return spring. When the anti-detachment plate rises, it will drive the sealing pipe to seal the inner end of the upper air outlet pipe in the fixed pipe, causing the upper air outlet pipe to be passively closed. Thus, the high-compressed gas will be used to push the impact pick forward quickly. The limit block and return spring in the slot can effectively ensure the rebound of the impact pick. The high-speed reciprocating action of the high-compressed air and the return spring will effectively break the underground obstacle and break it into small pieces. At this time, the two electric hinges at the bottom of the drill bit will drive the arc-shaped cone plate to open. Then, the external air compressor will suck out the small pieces of obstacle through the hollow rotating rod and discharge them to the surface.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. This invention utilizes a specially designed hollow rotating rod in conjunction with an elliptical stabilizer and an improved drill bit. Based on the working principle of the Reuleaux triangle, and aided by an improved Reuleaux triangle frame, the drill bit rotates eccentrically with the upper active drill rod. As the drill rod rises and falls and the drill bit sprays grout, an elliptical cross-section cement mixing pile is formed. This significantly improves the single pile bearing capacity, increases single-pile formation efficiency, accelerates construction, and saves manpower, material resources, and financial investment. Furthermore, the upper air outlet pipe is connected to a ground-based air compressor via an air supply pipe. The high-compressed air ejected from the air outlet loosens and removes the soil adhering to the drill bit's cutting teeth, improving the quality of the cement mixing pile.

[0022] 2. This invention designs adjacent cutting teeth in a staggered arrangement, allowing the rotating drill bit to clean the soil adhering to the cutting teeth, thus improving the quality and construction efficiency of the mixing pile. When the mixing pile drill bit encounters an unknown obstacle, the impact pick can efficiently break the obstacle. After the obstacle is broken into small pieces, the drill bit hinge automatically opens, and the air compressor sucks out the small obstacle pieces through the hollow rod and discharges them to the ground, ensuring the smooth progress of the mixing pile.

[0023] In summary, this invention, through the cooperation of the hollow rotating rod and the drilling mechanism, facilitates the lifting and lowering composite grouting operation inside the elliptical pile hole. Furthermore, the drilling mechanism performs secondary mixing and grouting of the cement slurry inside the pile hole during the lifting and rotating process, which improves the uniformity of mixing with the cement slurry sprayed at the first stage, thereby further improving the quality of pile formation. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the working state structure of the present invention;

[0027] Figure 3 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 4 This is a schematic diagram of the three-dimensional structure of the elliptical straightener and the Reuleaux triangle frame of the present invention;

[0029] Figure 5 This is a front view of the elliptical straightener and Reuleaux triangle frame three-dimensional structure of the present invention;

[0030] Figure 6 This is a top view of the elliptical straightener and Reuleaux triangle frame three-dimensional structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the Reuleaux triangle and drill bit three-dimensional structure of the present invention;

[0032] Figure 8 This is a cross-sectional view of the connection between the limiting block and the impact pick structure of the present invention;

[0033] Figure 9 This is a schematic diagram of the arc-shaped conical plate in the open state of the present invention.

[0034] The following are the components listed in the diagram: 1. Control panel; 2. Frame; 3. Winch; 4. Lifting platform; 5. Servo motor; 6. Hollow rotating rod; 7. Control box; 8. Support rod; 9. Winding steel rope; 10. Elliptical centralizer; 11. Drill plate; 12. Drill bit; 13. Impact pick; 14. Cutting teeth; 15. Upper air outlet pipe; 16. Arc-shaped cone plate; 17. Lower air outlet pipe; 18. Air supply pipe; 19. Reuleaux triangle frame; 20. Internal gear ring; 21. Motorized gear; 22. Fixed pipe; 23. Limit block; 24. Sealing pipe; 25. Return spring. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] Example: See Figure 1-9 An elliptical mixing pile construction device includes an operating platform 1 and a frame 2 horizontally positioned on top of the operating platform 1. A winch 3 is mounted on the operating platform 1 at the rear end of the frame 2. A horizontally positioned lifting platform 4 is vertically slidable at the front end of the frame 2. A fixed frame is mounted on the top of the lifting platform 4, and a lifting ring is installed on the top of the fixed frame. A servo motor 5 is installed in the fixed frame. A hollow rotating rod 6, coaxially connected to the servo motor 5, is vertically rotatably mounted on the bottom surface of the lifting platform 4. A winding steel rope 9 is wound on the winch 3, and the outer end of the winding steel rope 9 passes through a guide wheel on the frame 2 and is fixedly connected to the lifting ring on the fixed frame. Support rods 8, fixedly connected to the operating platform 1, are installed on both sides of the rear end of the frame 2. A control box 7 for starting and stopping the winch 3 and the servo motor 5 is located on one side of the rear end of the top surface of the operating platform 1. A drilling mechanism for mixing pile forming is installed at the bottom end of the hollow rotating rod 6.

[0037] The drilling mechanism includes an elliptical stabilizer 10 horizontally positioned below the bottom of the hollow rotating rod 6, a drill bit 12 vertically positioned within the inner frame of the elliptical stabilizer 10, and a Reuleaux triangle frame 19 positioned outside the drill bit 12 and inside the elliptical stabilizer 10. Multiple vertically placed drilling plates 11 are fixedly connected between the triangular portion of the inner frame of the Reuleaux triangle frame 19 and the drill bit 12. An elliptical guide groove is formed on the inner wall of the elliptical stabilizer 10, and the end of the Reuleaux triangle frame 19 movably abuts against the interior of the elliptical guide groove. A longitudinally placed positioning plate is horizontally fixed to the top of the elliptical stabilizer 10. A through hole is formed on the top surface of the positioning plate, and the through hole is fixedly connected to the hollow rotating rod 6 via a bearing ring. The bottom end of the hollow rotating rod 6 passes through the through hole into the inner frame of the elliptical stabilizer 10. An eccentric transmission assembly is provided at the top of the drill bit 12, and an impact assembly for breaking obstacles is provided at the bottom of the drill bit 12.

[0038] In this invention, a plurality of cutting teeth 14 are fixedly and equidistantly on the bottom surface of the drilling plate 11, and the cutting teeth 14 on the bottom of the three drilling plates 11 are staggered; a slurry channel communicating with the suction channel is opened inside the drilling plate 11, and a plurality of slurry outlet holes communicating with the slurry channel are opened at equal intervals on the bottom of the drilling plate 11; the eccentric transmission assembly includes an internal gear ring 20 horizontally fixed to the top of the drill bit 12, and a horizontally arranged motor gear 21 meshes with one side inside the internal gear ring 20. The motor gear 21 is fixedly sleeved on the bottom end of the hollow rotating rod 6 to ensure The rigidity and mechanical properties of the components are as follows: the motorized gear 21 and the upper hollow rotating rod 6 are integrally cast; the drill bit 12 has a suction channel inside, and a cross rod is horizontally fixed in the middle of the suction channel; a fixed tube 22 is vertically inserted through the bottom surface of the cross rod, and the bottom end of the hollow rotating rod 6 extends movably into the suction channel; the drill bit 12 is located at the center of the inner frame of the Reuleaux triangle 19; the Reuleaux triangle 19 of the drill bit 12 and its edge are in the shape of a Reuleaux triangle, and the form of the drill bit 12 can be improved according to different geological conditions, and a suitable drill bit form can be selected.

[0039] In this invention, a connecting hose is connected to the top of the fixed pipe 22, and the connecting hose extends into the hollow rotating rod 6. An air supply pipe 18 is attached to one inner wall of the hollow rotating rod 6, and the top of the connecting hose is fixedly connected to the bottom of the air supply pipe 18. A rotating air supply seat for connecting the air supply pipe 18 is installed on the top of the hollow rotating rod 6, and a connector for connecting to an external air compressor is provided on the rotating air supply seat. Two arc-shaped pointed cone plates 16 are hinged to both sides of the bottom end of the drill bit 12 by electric hinges, and two semi-circular arc-shaped openings are opened at the bottom ends of the two arc-shaped pointed cone plates 16. By staggering the upper and lower positions of adjacent cutting teeth 14, the drill bit 12 drives the drilling plate 11 to rotate, which can clean the adhering soil and improve the construction quality of the mixing pile.

[0040] In this invention, the impact assembly includes a limiting block 23 vertically fixed to the bottom end of the fixed tube 22, an installation cavity opened inside the limiting block 23, and an anti-detachment plate horizontally disposed inside the installation cavity. An impact pick 13 is vertically fixed to the bottom end of the anti-detachment plate, and the bottom end of the impact pick 13 movably extends out of the installation cavity. A fitting groove that mates with the anti-detachment plate is opened on the inner bottom surface of the installation cavity. A sealing tube 24 is vertically fixed to the top of the anti-detachment plate, and the upper part of the sealing tube 24 is movably inserted into the interior of the fixed tube 22. An upper vent pipe 15 is horizontally connected to the outer walls on both sides of the upper part of the fixed tube 22, and the top end of the sealing tube 24 is located below the inner end port of the upper vent pipe 15.

[0041] In this invention, a sealing sleeve is fitted onto the outer wall of the sealing tube 24, and the outer wall of the sealing sleeve is tightly fitted to the inner wall of the fixing tube 22; a return spring 25 is movably fitted onto the tube body of the sealing tube 24 located inside the installation cavity, the top end of the return spring 25 abuts against the inner top surface of the installation cavity, and the bottom end of the return spring 25 abuts against the top surface of the anti-detachment plate; the outer ends of the upper air outlet pipes 15 all penetrate out of the drill bit 12 and are bent upwards; a lower air outlet pipe 17 is installed on the outer wall of the arc-shaped cone plate 16; the limiting block 23 has a frustum-shaped structure, and the inclined side wall of the limiting block 23 abuts against the arc-shaped opening of the arc-shaped cone plate 16.

[0042] Working principle: In this embodiment, the present invention also proposes a construction method for an elliptical mixing pile construction device, including the following steps:

[0043] Step 1: Before construction, locate and lay out the lines according to the construction drawings, excavate trenches, and measure and lay out the pile positions. Then, connect the winch 3 and servo motor 5 to the control box 7 via wires, and connect the control box 7 to the external control equipment. Next, fix and connect the air supply base to the air supply pipe on the external compressor, and prepare cement slurry according to the water-cement ratio and cement dosage required by the design. Connect the external cement tank to the external compressor. Then, move the operating platform 1 to the location where the piles are to be formed.

[0044] Step two, next control the winch 3 to unwind the coiled steel rope 9, so that the fixed frame and the lifting platform 4 will descend. At this time, start the servo motor 5 to drive the hollow rotating rod 6 to rotate. The rotation of the hollow rotating rod 6 drives the motor gear 21 to rotate. Through the meshing transmission between the motor gear 21 and the inner ring of the internal gear ring 20, it is convenient for the Reuleaux triangle frame 19 to rotate in an elliptical path within the inner frame of the elliptical centralizer 10 under the action of the elliptical centralizer 10 via the drill bit 12.

[0045] Step 3: When the drill bit 12 and the Reuleaux triangle frame 19 rotate, the cutting teeth 14 at the bottom of the drill plate 11 can cut the excess soil at the point and make the elliptical stabilizer 10 follow the drill bit 12 down into the pile hole; then the external air compressor is started to supply the prepared cement slurry into the suction channel of the drill bit 12 through the hollow rotating rod 6, and the cement slurry enters the spraying channel through the suction channel and is discharged from the outlet hole. This makes it easy for the drill bit 12 and the Reuleaux triangle frame 19 to rotate and descend in an elliptical path during the descent and rotation process when the hollow rotating rod 6 drives the drill bit 12 and the Reuleaux triangle frame 19 to rotate and descend. This allows the cement slurry to fill the formed elliptical pile hole, and the spraying stops when the bottom of the impact pick 13 is 50cm from the ground.

[0046] Step four: Next, start the winch 3 to drive the lifting platform 4 to rise. During the rise, continue to start the external compressor to supply cement slurry to the drilling mechanism. This facilitates secondary mixing and spraying of slurry during the rising and rotating process of the drilling mechanism and can improve the uniformity of mixing with the cement slurry sprayed at the first time.

[0047] Step 5: When the drilling mechanism encounters an unknown obstacle during descent, the upper air hole is pushed into the pipe. At this time, the impact pick 13 will abut against the obstacle. The top of the impact pick 13 will then drive the anti-detachment plate inside the mounting cavity to compress the return spring 25. When the anti-detachment plate rises, it will drive the sealing pipe 24 to seal the inner end of the upper air outlet pipe 15 in the fixed pipe 22, causing the upper air outlet pipe 15 to be passively closed. This allows the high-compressed gas to quickly push the impact pick 13 forward. The limiting block 23 and the return spring 25 in the slot can effectively ensure the return of the impact pick 13. The drill bit 12 uses high-compressed air and the high-speed reciprocating action of the return spring 25 to effectively break down underground obstacles. After the obstacles are broken into small pieces, the two electric hinges at the bottom of the drill bit 12 are controlled to open the arc-shaped cone plate 16. Then, an external air compressor is used to suck out the small pieces of obstacles through the hollow rotating rod 6 and discharge them to the surface. After the obstacles are cleared, the above-mentioned mixing pile construction can continue. Moreover, the improved drilling rig of this invention is not limited to a single-axis mixing pile machine (this solution only takes a single-axis mixing pile machine as an example), and can be extended to dual-axis or even multi-axis mixing pile machines.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An elliptical mixing pile construction device, comprising an operating platform (1) and a frame (2) horizontally disposed on top of the operating platform (1), characterized in that: A winch (3) is provided on the operating table (1) at the rear end of the frame (2). A horizontally set lifting platform (4) is vertically slidable at the front end of the frame (2). A fixed frame is provided on the top of the lifting platform (4). A lifting ring is installed on the top of the fixed frame. A servo motor (5) is installed in the fixed frame. A hollow rotating rod (6) coaxially connected to the servo motor (5) is vertically rotatably installed on the bottom surface of the lifting platform (4). The winch (3) has a winding steel rope (9) wound on it. The outer end of the winding steel rope (9) passes through the guide wheel on the frame (2) and is fixedly connected to the lifting ring on the fixed frame. Support rods (8) that are fixed to the operating table (1) are installed on both sides of the rear end of the frame (2). A control box (7) for starting and stopping the winch (3) and the servo motor (5) is provided on one side of the rear end of the top surface of the operating table (1). A drilling mechanism for forming the mixing pile is installed at the bottom end of the hollow rotating rod (6). The drilling mechanism includes an elliptical stabilizer (10) horizontally positioned below the bottom of the hollow rotating rod (6), a drill bit (12) vertically positioned within the inner frame of the elliptical stabilizer (10), and a Reuleaux triangle (19) positioned inside the elliptical stabilizer (10) outside the drill bit (12). Multiple vertically placed drilling plates (11) are fixed between the triangle of the inner frame of the Reuleaux triangle (19) and the drill bit (12). An elliptical guide groove is formed on the inner wall of the elliptical stabilizer (10). The end of the triangular frame (19) is movably abutted against the inside of the elliptical guide groove; the top of the elliptical stabilizer (10) is horizontally fixed with a longitudinally placed positioning plate, the top surface of the positioning plate is provided with a through hole, the bottom end of the hollow rotating rod (6) passes through the through hole into the inner frame of the elliptical stabilizer (10), and the through hole and the hollow rotating rod (6) are fixedly connected by a bearing ring; the top of the drill bit (12) is provided with an eccentric transmission assembly; the bottom of the drill bit (12) is provided with an impact assembly for breaking obstacles; The eccentric transmission assembly includes an internal gear ring (20) horizontally fixed to the top of the drill bit (12), a horizontally arranged motor gear (21) meshing on one side inside the internal gear ring (20), the motor gear (21) being fixedly sleeved on the bottom end of the hollow rotating rod (6), a cross rod being horizontally fixed in the middle of the suction channel; a fixed tube (22) is vertically inserted through the bottom surface of the cross rod, and the bottom end of the hollow rotating rod (6) extends movably into the suction channel; the drill bit (12) is located at the center of the inner frame of the Reuleaux triangle (19); The bottom surface of the drilling plate (11) is fixed with multiple cutting teeth (14) at equal intervals, and the cutting teeth (14) at the bottom of the three drilling plates (11) are staggered; the drill bit (12) has a suction channel inside, the drilling plate (11) has a grouting channel communicating with the suction channel inside, and the bottom of the drilling plate (11) has multiple grout outlet holes communicating with the grouting channel at equal intervals.

2. The elliptical mixing pile construction equipment according to claim 1, characterized in that: The top end of the fixed tube (22) is connected to a connecting hose, which extends into the hollow rotating rod (6). An air supply pipe (18) is attached to one side of the inner wall of the hollow rotating rod (6). The top end of the connecting hose is fixedly connected to the bottom end of the air supply pipe (18). A rotating air supply seat for connecting the air supply pipe (18) is installed on the top of the hollow rotating rod (6). The rotating air supply seat is provided with a connector for connecting to an external air compressor.

3. The elliptical mixing pile construction equipment according to claim 2, characterized in that: The bottom of the drill bit (12) is hinged to two arc-shaped cone plates (16) by electric hinges on both sides, and the bottom of the two arc-shaped cone plates (16) has two semi-circular arc-shaped openings.

4. The elliptical mixing pile construction equipment according to claim 3, characterized in that: The impact assembly includes a limiting block (23) vertically fixed to the bottom end of the fixed tube (22), an installation cavity opened inside the limiting block (23), and an anti-detachment plate horizontally set inside the installation cavity. An impact pick (13) is vertically fixed to the bottom end of the anti-detachment plate. The bottom end of the impact pick (13) extends movably through the installation cavity. A fitting groove that mates with the anti-detachment plate is opened on the inner bottom surface of the installation cavity. A sealing tube (24) is vertically fixed to the top of the anti-detachment plate. The upper part of the sealing tube (24) is movably inserted into the interior of the fixed tube (22). An upper air outlet pipe (15) is horizontally connected to the outer wall on both sides of the upper part of the fixed tube (22). The top end of the sealing tube (24) is located below the inner end port of the upper air outlet pipe (15).

5. The elliptical mixing pile construction equipment according to claim 4, characterized in that: A sealing sleeve is fitted on the outer wall of the sealing tube (24), and the outer wall of the sealing sleeve is tightly fitted with the inner wall of the fixing tube (22); a return spring (25) is movably fitted on the tube body of the sealing tube (24) located inside the installation cavity, the top end of the return spring (25) abuts against the inner top surface of the installation cavity, and the bottom end of the return spring (25) abuts against the top surface of the anti-detachment plate.

6. The elliptical mixing pile construction equipment according to claim 5, characterized in that: The outer ends of the upper air outlet pipe (15) all extend through the drill bit (12) and are bent upwards; the lower air outlet pipe (17) is installed on the outer wall of the arc-shaped cone plate (16); the limiting block (23) is a frustum-shaped structure, and the inclined side wall of the limiting block (23) abuts against the arc-shaped opening of the arc-shaped cone plate (16).

7. A construction method for an elliptical mixing pile construction device according to any one of claims 1-6, characterized in that, Includes the following steps: S1. First, before construction, the trench is dug and the pile position is measured and laid out according to the construction drawings. Then, the winch (3) and the servo motor (5) are electrically connected to the control box (7) through wires, and the control box (7) is electrically connected to the external control equipment. Next, the air supply seat is fixedly connected to the air supply pipe on the external compressor, and cement slurry is prepared according to the water-cement ratio and cement content required by the design. The external cement tank is connected to the external compressor. Then, the operating table (1) is moved to the location where the pile is to be formed. S2, then control the winch (3) to unwind the coiled steel rope (9), so that the fixed frame and the lifting platform (4) are lowered. At this time, start the servo motor (5) to drive the hollow rotating rod (6) to rotate. The rotation of the hollow rotating rod (6) drives the motor gear (21) to rotate. Through the meshing transmission between the motor gear (21) and the inner ring of the internal gear ring (20), it is convenient to drive the Reuleaux triangle frame (19) to rotate in an elliptical path in the inner frame of the elliptical stabilizer (10) under the action of the elliptical stabilizer (10). S3, when the drill bit (12) and the Reuleaux triangle (19) rotate, the cutting teeth (14) at the bottom of the drill plate (11) can cut the excess soil at the point and make the elliptical stabilizer (10) follow the drill bit (12) down into the pile hole; then the external air compressor is started to supply the prepared cement slurry into the suction channel of the drill bit (12) through the hollow rotating rod (6), and the cement slurry enters the spraying channel through the suction channel and is discharged from the outlet hole, so that when the hollow rotating rod (6) drives the drill bit (12) and the Reuleaux triangle (19) to rotate and descend, the rotation spraying operation can be repeated in an elliptical path during the descent and rotation, so that the cement slurry can fill the formed elliptical pile hole, and the spraying stops when the bottom of the impact pick (13) is 50cm from the ground. S4, then start the winch (3) to drive the lifting platform (4) to rise. During the rise, continue to start the external compressor to supply cement slurry to the drilling mechanism. This facilitates secondary mixing and spraying of slurry during the rise and rotation of the drilling mechanism and can improve the uniformity of mixing with the first sprayed cement slurry. S5, when the drilling mechanism encounters an unknown obstacle during descent, the upper air hole is pushed into the pipe. At this time, the impact pick (13) will abut against the obstacle, break the obstacle, and break the obstacle into small pieces. At this time, the two electric hinges at the bottom of the drill bit (12) will drive the arc-shaped cone plate (16) to open. Then, the external air compressor will suck out the small obstacle through the hollow rotating rod (6) and discharge it to the ground surface.

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