Drilling tool for construction of variable cross-section cement mixing pile and use method

Abstract

The invention discloses a drilling tool for construction of a variable-cross-section cement mixing pile and a using method. The drilling tool comprises a spiral drilling tool body and a connector, and the connector is fixedly installed at the top of the spiral drilling tool body; an adjusting part is mounted at the lower end of the spiral drilling tool and comprises an air cylinder, a damping mechanism, a base, a connector, a linkage supporting rod, an adjusting plate and a positioning seat, and the middle of the air cylinder penetrates through the damping mechanism; an air cylinder extends downwards, so that the upper end of a linkage supporting rod is linked downwards, the lower end of the linkage supporting rod pushes the upper ends of adjusting plates outwards, and the four external adjusting plates conduct reaming adjustment in four directions of the outer side of the spiral drilling tool at inclined angles. The adjusting angle of the adjusting part is changed, the problem of forming of the variable-cross-section hole is reduced, and the effect that the inclination angle after adjustment of the adjusting plate is kept in a stable state under linkage supporting of the linkage supporting rod and positioning shaft connection of the positioning seat is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building, and particularly relates to a variable cross-section cement mixing pile construction drill and a use method. BACKGROUND

[0002] In actual engineering, the ground soil layer is often uneven, and the variable cross-section cement mixing pile can be used in construction to flexibly adjust the pile section according to the strength requirements of different strata, and the variable cross-section cement mixing pile can be optimized and designed according to the actual stress condition and stratum condition; in the stratum or pile body part that does not need a large section, the pile section size is reduced, thereby reducing the amount of cement and other materials; the hole of the variable cross-section cement mixing pile is drilled by the variable cross-section cement mixing pile construction drill. However, the variable cross-section cement mixing pile construction drill of the prior art has the following disadvantages: the diameter adjusting part on the drill cannot be stably supported after adjustment, is affected by the rotation of the drill, and is prone to displacement, which changes the adjusting angle of the adjusting part and reduces the effect of forming the variable cross-section hole; and the cement is injected through the hollow part inside the drill, which is prone to blockage when flowing inside the cement drill, thereby failing to smoothly inject glue into the drilled hole. SUMMARY

[0003] The present application aims to provide a variable cross-section cement mixing pile construction drill and a use method, which solves the technical problem of the prior art that the adjusting part is prone to displacement, which changes the adjusting angle of the adjusting part and reduces the effect of forming the variable cross-section hole.

[0004] The technical solution adopted by the present application to solve the technical problem is as follows: The variable cross-section cement mixing pile construction drill comprises a spiral drill, a connecting head, and a connecting head fixedly installed at the top of the spiral drill; an adjusting part is installed at the lower end of the spiral drill, the adjusting part comprises a cylinder, a damping mechanism, a base, a connecting head, a linkage support rod, an adjusting plate, and a positioning seat, the cylinder penetrates the inside of the damping mechanism, the output end of the cylinder is installed on the base, the damping mechanism and the base are installed inside the spiral drill, the connecting head is welded on the output end of the cylinder, the outer part of the connecting head is connected with the upper end of the linkage support rod in a shaft, the lower end of the linkage support rod is connected with the upper end of the adjusting plate in a shaft, the lower end of the adjusting plate is connected with the inside of the positioning seat in a shaft, and the positioning seat is fixedly installed on the outer surface of the lower end of the spiral drill.

[0005] The variable cross-section cement mixing pile construction drill of the present application, the damping mechanism comprises a positioning ring, a spring pipe sleeve, an extrusion rod, and a clamping plate, the positioning ring is fixed on the inner wall of the spiral drill, the inner wall of the positioning ring is welded with the outer side end of the spring pipe sleeve, the outer side end of the extrusion rod is installed in the inner side end of the spring pipe sleeve through clearance fit, the inner side end of the extrusion rod is fixed with the middle part of the outer side surface of the clamping plate, and the clamping plate is clamped and fixed to the outer surface of the middle part of the air cylinder.

[0006] The variable cross-section cement mixing pile construction drill of the present application, the inner side of the base is further provided with a silica gel pad, and the silica gel pad supports the output end of the air cylinder, thereby improving the stability of the installation of the output end of the air cylinder in the middle end of the base.

[0007] The variable cross-section cement mixing pile construction drill of the present application, the spiral drill is further provided with a grouting mechanism, the grouting mechanism comprises an inlet pipe, a flow divider, a flow divider pipe, a collecting cavity, and a discharge mechanism, the inlet pipe is embedded on the upper end of the spiral drill, and the inlet pipe is connected with the upper end of the flow divider, the flow divider is fixed in the inner part of the upper end of the spiral drill, the flow divider pipe is connected with the lower end of the flow divider, the flow divider pipe is vertically installed in the inner part of the spiral drill, and the middle part of the flow divider pipe penetrates into the connecting hole provided on the base, the lower end of the flow divider pipe is fixed above the collecting cavity, and the collecting cavity is arranged in the inner part of the lower end of the spiral drill, and the collecting cavity is connected with the discharge mechanism.

[0008] The variable cross-section cement mixing pile construction drill of the present application, the vibration mechanism provided on the discharge mechanism comprises a lower discharge pipe, an outer ring, a damping seat, a piezoelectric ceramic vibrator, and a vibration guide plate, the upper end of the lower discharge pipe is connected with the lower end of the collecting cavity, and the outer side of the lower discharge pipe is provided with an outer ring, the outer ring is fixedly installed in the inner part of the spiral drill, the inner wall of the outer ring is provided with a damping seat, the outer side end of the piezoelectric ceramic vibrator is installed in the inner part of the damping seat, the inner side end of the piezoelectric ceramic vibrator is provided with a vibration guide plate, and the vibration guide plate is embedded in the inner part of the lower discharge pipe.

[0009] The variable cross-section cement mixing pile construction drill of the present application, the discharge mechanism is further provided with a discharge outlet, and the upper end of the discharge outlet is connected with the lower end of the lower discharge pipe, the discharge outlet is located in the inner part of the lower end of the spiral drill, an opening and closing baffle is installed in the outer side of the discharge outlet, and the upper end of the opening and closing baffle is hinged with the inner part of the lower end of the spiral drill through a torsion shaft.

[0010] The use method of the variable cross-section cement mixing pile construction drill comprises the following steps: Step one, connect the connecting head with the external driving assembly, so that the external driving assembly can drive the spiral drill to rotate, the sharp head at the bottom of the spiral drill is inserted into the soil, and the threaded blade provided on the outer part of the spiral drill can transport the soil in the drilling process upward, so that the spiral drill drills the hole of the cement mixing pile; Step 2: During drilling, the diameter of the auger is adjusted according to parameters such as the location of the variable cross section, the ratio of the variable cross section, the diameter of different parts of the pile body, and the bearing capacity of the foundation under different geological conditions. By extending the cylinder, the connecting head is moved down. At this time, the four linkage rods move synchronously, and the four outer adjustment plates are adjusted synchronously. By extending the four adjustment plates, the diameter of the auger is adjusted, so that the hole of the variable cross section cement mixing pile can be drilled. Step 3: When the auger drill is rotating, the elastic cooperation of the spring sleeve and the extrusion rod enables the four clamping plates to stably clamp and fix the middle of the cylinder, preventing the cylinder from running erratically. Step 4: After the hole for the variable cross-section cement mixing pile is drilled, the auger stops rotating and the cylinder drives the adjusting plate to reset, adjusting the diameter of the auger to the minimum. Then, the cement slurry is connected to the inlet pipe through the external cement slurry and discharged into the auger. Under the diversion of the diversion head, the cement slurry flows down the two diversion pipes into the collection chamber for collection. Step 5: The cement slurry flows down through the collecting cavity into the lower drain pipe. At this time, an AC voltage is applied to the piezoelectric ceramic vibrator, causing it to generate high-frequency vibration. The vibration is transmitted through the guide plate, allowing the cement slurry inside the lower drain pipe to flow smoothly downwards, preventing the cement slurry from becoming blocked inside the lower drain pipe. Step 6: The cement slurry flows through the lower pipe to the two outlets. When the cement slurry is discharged from the outlets, the gravity of the cement slurry impacts the opening and closing baffles, causing the opening and closing baffles to rotate automatically outwards to ensure the discharge of cement slurry. The cement slurry is then dispersed into the holes of the variable cross-section cement mixing pile through the two outlets, so that the holes of the variable cross-section cement mixing pile are fully grouted. Step 7: The auger drill bit is continuously raised inside the hole of the variable cross-section cement mixing pile while cement grouting is being carried out, thus completing the grouting work of the variable cross-section cement mixing pile.

[0011] The beneficial effects of this invention are: 1. By extending the cylinder downwards, the upper end of the connecting rod moves downwards, while the lower end of the connecting rod moves outwards, pushing the upper end of the adjusting plate outwards. The four external adjusting plates are tilted at four positions on the outside of the auger drill bit to expand the hole. This solves the problem that the adjusting parts are prone to displacement, which leads to changes in the adjustment angle of the adjusting parts and reduces the forming of variable cross-section holes. It achieves the effect of ensuring that the tilt angle of the adjusting plate remains stable after adjustment, under the linkage support of the connecting rod and the positioning axis of the positioning seat. 2. A shock-absorbing mechanism is adopted, which uses a clamping plate to elastically clamp and fix the outer surface of the cylinder in the middle. A sponge pad is also provided on the inner side of the clamping plate to improve the stability of the clamping plate clamping the cylinder. This solves the problem that the adjusting parts cannot be stably adjusted when the auger rotates. The cylinder is stably installed inside the auger, avoiding the cylinder from being unable to perform stable extension and retraction work due to the rotation of the auger. 3. Using piezoelectric ceramic vibrators, the four piezoelectric ceramic vibrators and the guide plate work together to make the lower pipe vibrate in four directions, which solves the problem that cement slurry is easy to block inside the auger during grouting, and achieves the effect of smooth flow of cement slurry inside the auger.

[0012] 4. An opening and closing baffle is adopted. After the cement slurry is discharged, the opening and closing baffle is elastically reset by the torsion shaft, so that the opening and closing baffle closes the outer end of the discharge outlet. This solves the problem of the discharge outlet being blocked by soil and achieves the effect of smoothly injecting cement into the hole of the variable cross-section cement mixing pile. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the spiral drill bit of the present invention; Figure 3 This is a three-dimensional structural diagram of the adjusting component of the present invention; Figure 4 This is a schematic diagram of the shock absorption mechanism and a partially enlarged structure of the present invention; Figure 5 This is a schematic diagram of a partial internal structure of the lower end of the spiral drill bit of the present invention; Figure 6 This is a top view of the vibratory mechanism of the present invention; Figure 7 For the present invention Figure 5 A magnified schematic diagram of the structure at point A.

[0014] In the diagram: auger drill bit-1, adjusting component-2, cylinder-21, shock absorption mechanism-22, positioning ring-221, spring tube sleeve-222, extrusion rod-223, clamping plate-224, base-23, silicone pad-231, connector-24, linkage support rod-25, adjusting plate-26, positioning seat-27, connector-3, grouting mechanism-4, inlet pipe-41, diverter head-42, diverter pipe-43, collecting chamber-44, discharge mechanism-45, vibratory grouting mechanism-451, lower discharge pipe-4511, outer ring-4512, damping seat-4513, piezoelectric ceramic vibrator-4514, vibration guide plate-4515, discharge outlet-452, opening and closing baffle-4521, torsion shaft-4522. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] As attached Figures 1-4 As shown, a drilling tool for construction of variable cross-section cement mixing piles includes: a spiral drill 1 and a connector 3, wherein the connector 3 is fixedly installed on the top of the spiral drill 1; An adjusting component 2 is installed at the lower end of the auger drill 1. The adjusting component 2 includes a cylinder 21, a shock-absorbing mechanism 22, a base 23, a connector 24, a connecting rod 25, an adjusting plate 26, and a positioning seat 27. The middle part of the cylinder 21 passes through the inside of the shock-absorbing mechanism 22, and the output end of the cylinder 21 is installed on the base 23. Both the shock-absorbing mechanism 22 and the base 23 are installed inside the auger drill 1. A connector 24 is welded to the output end of the cylinder 21. The outside of the connector 24 is connected to the upper shaft of the connecting rod 25, and the lower end of the connecting rod 25 is connected to the upper inner shaft of the adjusting plate 26. The lower end of the adjusting plate 26 is connected to the inner shaft of the positioning seat 27, and the positioning seat 27 is fixedly installed on the lower outer surface of the auger drill 1. The system includes four connecting rods 25, four adjusting plates 26, and four positioning seats 27, distributed at the four positions of the auger drill 1. The cylinder 21 extends downwards, causing the connector 24 to descend. This causes the upper end of the connecting rod 25 to move downwards, while the lower end of the connecting rod 25 moves outwards, pushing the upper end of the adjusting plate 26 outwards. Under the positioning shaft connection of the positioning seat 27, the four external adjusting plates 26 are tilted at four positions on the outside of the auger drill 1 for hole enlargement adjustment. Furthermore, the connecting support of the connecting rods 25 and the positioning shaft connection of the positioning seat 27 ensure that the tilt angle of the adjusting plate 26 remains stable after adjustment, unaffected by the rotation of the auger drill 1.

[0017] The shock absorption mechanism 22 includes a positioning ring 221, a spring tube sleeve 222, a pressing rod 223, and a clamping plate 224. The positioning ring 221 is fixed on the inner wall of the auger drill 1, and the inner wall of the positioning ring 221 is welded to the outer end of the spring tube sleeve 222. The outer end of the pressing rod 223 is installed inside the inner end of the spring tube sleeve 222 with a clearance fit, and the inner end of the pressing rod 223 is fixed to the middle part of the outer surface of the clamping plate 224. The clamping plate 224 clamps and fixes the middle outer surface of the cylinder 21. The spring sleeve 222, the extrusion rod 223, and the clamping plate 224 are all provided in four positions, distributed on the four sides inside the positioning ring 221. The spring sleeve 222 is composed of a round tube and a spring. The spring applies elastic force to the extrusion rod 223, and the round tube guides the extrusion rod 223 vertically, so that the extrusion rod 223 drives the clamping plate 224 to elastically clamp and fix the outer surface of the middle part of the cylinder 21. A sponge pad is provided on the inner side of the clamping plate 224 to improve the stability of the clamping plate 224 in clamping the cylinder 21, thereby improving the stability of the cylinder 21 installed inside the auger drill 1 and preventing the cylinder 21 from being unable to perform stable extension and retraction work due to the rotation of the auger drill 1.

[0018] A silicone pad 231 is also provided on the inner side of the base 23, and the silicone pad 231 supports the output end of the cylinder 21, thereby improving the stability of the output end of the cylinder 21 when it is installed in the middle of the base 23.

[0019] As attached Figures 5-7 As shown, the auger drill 1 is also equipped with a grouting mechanism 4. The grouting mechanism 4 includes an inlet pipe 41, a diverter head 42, a diverter pipe 43, a collecting cavity 44, and a discharge mechanism 45. The inlet pipe 41 is embedded in the upper end of the auger drill 1 and is connected to the upper end of the diverter head 42. The diverter head 42 is fixed inside the upper end of the auger drill 1. The lower end of the diverter head 42 is connected to the diverter pipe 43. The diverter pipe 43 is vertically installed inside the auger drill 1, and the middle part of the diverter pipe 43 passes through the connecting hole provided on the base 23. The lower end of the diverter pipe 43 is fixed above the collecting cavity 44, and the collecting cavity 44 is located inside the lower end of the auger drill 1. The lower end of the collecting cavity 44 is connected to the discharge mechanism 45.

[0020] The diverter head 42 has a Y-shaped structure, and there are two diverter pipes 43. Under the diversion of the diverter head 42, the cement slurry injected into the inlet pipe 41 is diverted into the two diverter pipes 43. The cement slurry is dispersed and delivered into the collecting cavity 44 through the two diverter pipes 43. The diversion can prevent the cement slurry from clogging inside the auger drill bit 1. The collecting cavity 44 has a hollow structure that is wide at the top and narrow at the bottom, which is conducive to collecting the cement downward into the discharge mechanism 45 and discharging the cement slurry completely, thus preventing the cement slurry from staying inside the auger drill bit 1.

[0021] The vibratory mechanism 451 provided on the discharge mechanism 45 includes a lower discharge pipe 4511, an outer ring 4512, a damping seat 4513, a piezoelectric ceramic vibrator 4514, and a guide plate 4515. The upper end of the lower discharge pipe 4511 is connected to the lower end of the collecting cavity 44, and an outer ring 4512 is provided on the outer side of the lower discharge pipe 4511. The outer ring 4512 is fixedly installed inside the auger drill 1. A damping seat 4513 is provided on the inner wall of the outer ring 4512, and the outer end of the piezoelectric ceramic vibrator 4514 is installed inside the damping seat 4513. A guide plate 4515 is provided on the inner end of the piezoelectric ceramic vibrator 4514, and the guide plate 4515 is embedded inside the lower discharge pipe 4511. Among them, the piezoelectric ceramic vibrator 4514 is composed of a piezoelectric ceramic sheet, electrodes and a shell. It is a device that applies an AC voltage to the piezoelectric ceramic material, causing the ceramic sheet to undergo periodic deformation, thereby driving the metal sheet attached to it to bend and vibrate at high speed. The working frequency is very high, usually reaching more than 200Hz, or even 400-500Hz. Furthermore, the piezoelectric ceramic vibrator 4514 has an extremely fast response speed, high vibration accuracy, low power consumption and long life. Through the cooperation of four piezoelectric ceramic vibrators 4514 and the vibration guide plate 4515, the four directions inside the lower pipe 4511 are vibrated, effectively avoiding the blockage of cement inside the lower pipe 4511. The discharge mechanism 45 is also provided with a discharge port 452, and the upper end of the discharge port 452 is connected to the lower end of the lower discharge pipe 4511. The discharge port 452 is located inside the lower end of the auger bit 1. An opening and closing baffle 4521 is installed inside the outer side of the discharge port 452, and the upper end of the opening and closing baffle 4521 is hinged to the lower end of the auger bit 1 through a torsion shaft 4522. The system includes two outlets 452, both of which are inclined with the inner end higher than the outer end. These outlets disperse the cement slurry into the drilled hole. During discharge, the cement slurry impacts the opening / closing baffle 4521, causing it to automatically rotate outwards to ensure proper discharge. Once the discharge is complete, a torsion shaft 4522 provides elastic reset to the opening / closing baffle 4521, closing the outer end of the outlet 452 and preventing soil from entering and clogging the outlet during drilling.

[0022] The construction method is as follows: Step 1: Connect the external drive assembly through connector 3 so that the external drive assembly can drive the auger drill 1 to rotate. The tip at the bottom of the auger drill 1 extends into the soil, and the threaded blades on the outside of the auger drill 1 can transport the soil upward during the drilling process, so that the auger drill 1 can drill the hole of the cement mixing pile. Step 2: During drilling, the diameter of the auger drill bit 1 is adjusted according to parameters such as the location of the variable cross section, the ratio of the variable cross section, the diameter of different parts of the pile body, and the bearing capacity of the foundation under different geological conditions. By extending the start cylinder 21, the connecting head 24 is moved down. At this time, the four linkage rods 25 move synchronously, and the four outer adjustment plates 26 are adjusted synchronously. By extending the four adjustment plates 26, the diameter of the auger drill bit 1 is adjusted, so that the hole of the variable cross section cement mixing pile can be drilled. Step 3: When the auger drill 1 is rotating, the elastic cooperation of the spring sleeve 222 and the extrusion rod 223 enables the four clamping plates 224 to stably clamp and fix the middle part of the cylinder 21, thus preventing the cylinder 21 from running erratically. Step 4: After the hole for the variable cross-section cement mixing pile is drilled, the auger drill 1 stops rotating and the cylinder 21 drives the adjusting plate 26 to reset, adjusting the diameter of the auger drill 1 to the minimum state. Then, the cement slurry is connected to the inlet pipe 41 through the external cement slurry and discharged into the auger drill 1 from the inlet pipe 41. Under the diversion of the diversion head 42, the cement slurry flows down along the two diversion pipes 43 into the collection chamber 44 for collection. Step 5: The cement slurry flows down through the collecting cavity 44 into the lower drain pipe 4511. At this time, an AC voltage is applied to the piezoelectric ceramic vibrator 4514, causing the piezoelectric ceramic vibrator 4514 to generate high-frequency vibration. The vibration is transmitted through the guide plate 4515, so that the cement slurry inside the lower drain pipe 4511 can flow smoothly downward and avoid blockage of the cement slurry inside the lower drain pipe 4511.

[0023] Step Six: The cement slurry flows through the lower discharge pipe 4511 into the two discharge outlets 452. When the cement slurry is discharged from the discharge outlets 452, the gravity of the cement slurry impacts the opening and closing baffle 4521, causing the opening and closing baffle 4521 to rotate automatically outward, ensuring that the cement slurry is discharged. The cement slurry is then dispersed into the holes of the variable cross-section cement mixing pile through the two discharge outlets 452, so that the holes of the variable cross-section cement mixing pile are fully grouted.

[0024] Step 7: The auger drill bit 1 is continuously raised inside the hole of the variable cross-section cement mixing pile while cement grouting is being carried out, thereby completing the grouting work of the variable cross-section cement mixing pile.

[0025] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0027] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A drilling tool for constructing variable cross-section cement mixing piles, characterized in that, include: A spiral drill bit (1) and a connector (3) are provided. The connector (3) is fixedly installed on the top of the spiral drill bit (1). An adjusting component (2) is installed at the lower end of the spiral drill bit (1). The adjusting component (2) includes a cylinder (21), a shock-absorbing mechanism (22), a base (23), a connector (24), a connecting rod (25), an adjusting plate (26), and a positioning seat (27). The middle part of the cylinder (21) passes through the inside of the shock-absorbing mechanism (22), and the output end of the cylinder (21) is installed on the base (23). On 23), the shock absorption mechanism (22) and the base (23) are both installed inside the auger drill (1). A connector (24) is welded to the output end of the cylinder (21). The outside of the connector (24) is connected to the upper shaft of the connecting rod (25), and the lower end of the connecting rod (25) is connected to the inner shaft of the upper end of the adjusting plate (26). The lower end of the adjusting plate (26) is connected to the inner shaft of the positioning seat (27), and the positioning seat (27) is fixedly installed on the outer surface of the lower end of the auger drill (1).

2. The drilling tool for variable cross-section cement mixing pile construction according to claim 1, characterized in that, The shock absorption mechanism (22) includes a positioning ring (221), a spring tube sleeve (222), a pressing rod (223), and a clamping plate (224). The positioning ring (221) is fixed on the inner wall of the auger drill (1), and the inner wall of the positioning ring (221) is welded to the outer end of the spring tube sleeve (222). The outer end of the pressing rod (223) is installed inside the inner end of the spring tube sleeve (222) with a clearance fit, and the inner end of the pressing rod (223) is fixed to the middle part of the outer surface of the clamping plate (224). The clamping plate (224) clamps and fixes the outer surface of the middle part of the cylinder (21).

3. The drilling tool for variable cross-section cement mixing pile construction according to claim 2, characterized in that, A silicone pad (231) is also provided on the inner side of the base (23), and the silicone pad (231) supports the output end of the cylinder (21) to improve the stability of the output end of the cylinder (21) installed in the middle of the base (23).

4. The drilling tool for variable cross-section cement mixing pile construction according to claim 3, characterized in that, The auger drill (1) is also equipped with a grouting mechanism (4). The grouting mechanism (4) includes an inlet pipe (41), a diverter head (42), a diverter pipe (43), a collecting chamber (44), and a discharge mechanism (45). The inlet pipe (41) is embedded in the upper end of the auger drill (1), and the inlet pipe (41) is connected to the upper end of the diverter head (42). The diverter head (42) is fixed inside the upper end of the auger drill (1), and the lower end of the diverter head (42) is connected to the diverter pipe (43). The diverter pipe (43) is vertically installed inside the auger drill (1).

5. The drilling tool for variable cross-section cement mixing pile construction according to claim 4, characterized in that, The middle part of the diversion pipe (43) passes through the connection hole provided on the base (23). The lower end of the diversion pipe (43) is fixed above the collection cavity (44), and the collection cavity (44) is located inside the lower end of the auger drill (1). The lower end of the collection cavity (44) is connected to the discharge mechanism (45).

6. The drilling tool for variable cross-section cement mixing pile construction according to claim 5, characterized in that, The vibratory mechanism (451) provided on the discharge mechanism (45) includes a lower discharge pipe (4511), an outer ring (4512), a damping seat (4513), a piezoelectric ceramic vibrator (4514), and a guide plate (4515). The upper end of the lower discharge pipe (4511) is connected to the lower end of the collecting cavity (44), and an outer ring (4512) is provided on the outside of the lower discharge pipe (4511). The outer ring (4512) is fixedly installed inside the spiral drill (1), and a damping seat (4513) is provided on the inner wall of the outer ring (4512).

7. The drilling tool for variable cross-section cement mixing pile construction according to claim 6, characterized in that, The outer end of the piezoelectric ceramic vibrator (4514) is installed inside the damping seat (4513), and the inner end of the piezoelectric ceramic vibrator (4514) is provided with a vibration guide plate (4515), which is embedded inside the lower pipe (4511).

8. The drilling tool for variable cross-section cement mixing pile construction according to claim 7, characterized in that, The discharge mechanism (45) is also provided with a discharge port (452), and the upper end of the discharge port (452) is connected to the lower end of the lower discharge pipe (4511). The discharge port (452) is located inside the lower end of the auger bit (1). An opening and closing baffle (4521) is installed inside the outer side of the discharge port (452), and the upper end of the opening and closing baffle (4521) is hinged to the lower end of the auger bit (1) through a torque shaft (4522).

9. Method of using drilling tools for variable cross-section cement mixing pile construction: characterized in that, Includes the following steps: Step 1: Connect the connector (3) to the external drive assembly so that the external drive assembly can drive the auger (1) to rotate. The tip at the bottom of the auger (1) extends into the soil and the threaded blades on the outside of the auger (1) can transport the soil during the drilling process upward so that the auger (1) can drill the hole of the cement mixing pile. Step 2: During drilling, the diameter of the auger (1) is adjusted according to the parameters such as the location of the variable cross section, the ratio of the variable cross section, the diameter of different parts of the pile body, and the bearing capacity of the foundation under different geological conditions. By extending the start cylinder (21), the connecting head (24) is driven to move down. At this time, the four linkage rods (25) move synchronously, and the four outer adjustment plates (26) are adjusted synchronously. By extending the four adjustment plates (26), the diameter of the auger (1) is adjusted, so that the hole of the variable cross section cement mixing pile can be drilled. Step 3: When the auger drill (1) is rotating, the elastic cooperation of the spring sleeve (222) and the extrusion rod (223) enables the four clamping plates 224 to stably clamp and fix the middle part of the cylinder 21, thus preventing the cylinder (21) from running erratically. Step 4: After the hole of the variable cross-section cement mixing pile is drilled, the auger (1) stops rotating and the cylinder (21) drives the adjusting plate (26) to reset, adjusting the diameter of the auger (1) to the minimum state. Then, the cement slurry is connected to the inlet pipe (41) through the external cement slurry and discharged from the inlet pipe (41) into the auger (1). Under the diversion of the diversion head (42), the cement slurry flows down along the two diversion pipes (43) into the collection chamber (44) for collection. Step 5: The cement slurry flows down through the collecting cavity (44) into the lower drain pipe (4511). At this time, an AC voltage is applied to the piezoelectric ceramic vibrator (4514), causing the piezoelectric ceramic vibrator (4514) to generate high-frequency vibration. The vibration is transmitted through the guide plate (4515), so that the cement slurry inside the lower drain pipe (4511) can flow down smoothly, avoiding blockage of the cement slurry inside the lower drain pipe (4511). Step 6: Cement slurry flows through the lower pipe (4511) to the two outlets (452). When the cement slurry is discharged from the outlets (452), it impacts the opening and closing baffle (4521) by gravity, so that the opening and closing baffle (4521) can rotate automatically to ensure the discharge of cement slurry. The cement slurry is dispersed into the holes of the variable cross-section cement mixing pile through the two outlets (452) so that the holes of the variable cross-section cement mixing pile are fully grouted. Step 7: The spiral drill bit (1) is continuously lifted upward inside the hole of the variable cross-section cement mixing pile while cement grouting is being carried out, thereby completing the grouting work of the variable cross-section cement mixing pile.

Images