Cement mixing pile air entraining mixing hole forming device and construction method

Abstract

The application discloses a cement mixing pile gasification and mixing hole forming device and a construction method, relates to the technical field of pile foundations, and has the effects of improving the hole drilling efficiency of a spiral hole drilling machine.

Description

Technical Field

[0001] This application relates to the field of pile foundation technology, and in particular to a cement mixing pile aerated mixing hole-forming device and construction method. Background Technology

[0002] Cement mixing piles are an effective form of soft soil treatment. They use cement as a hardening agent, and a mixer is used to spray cement into the soil and mix it thoroughly, so that the cement and soil undergo a series of physical and chemical reactions, which harden the soft soil and improve the foundation strength.

[0003] In related technologies, the construction of cement mixing piles is carried out by a spiral drilling machine. The body of the spiral drilling machine transports the drill rod with spiral blades to the planned location, while aligning the drill bit at the end of the drill rod with the planned location, driving the drill rod to rotate. The drill rod drives the spiral blades and drill bit to rotate, the drill bit penetrates the soil layer and the spiral blades cut the soil layer, and the cut soil is transported to the outside of the pile hole through the spiral blades.

[0004] Regarding the aforementioned technologies, when the drill rod drives the spiral blades and drill bit to rotate and cut holes, the drill bit will be covered with soil. If it is not cleaned in time, it will make it difficult for the drill bit to quickly penetrate the soil layer, prolonging the drilling time of the spiral drilling machine and resulting in low drilling efficiency. Summary of the Invention

[0005] In order to improve the problem of low drilling efficiency of auger drilling machines caused by a large amount of soil covering the drill bit of the drill rod, this application provides a cement mixing pile aeration mixing hole forming device and construction method.

[0006] Firstly, the cement mixing pile aerated mixing hole-forming device provided in this application adopts the following technical solution:

[0007] A cement mixing pile aeration mixing hole forming device includes a body, a drill rod, a spiral blade, and a drill bit. A grinding disc is fixedly sleeved on the drill rod, and the grinding disc is located between the spiral blade and the drill bit. Multiple cutting blades are installed on the end face of the grinding disc near the drill bit. Multiple air nozzles for blowing air into the drill bit are also installed on the end face of the grinding disc near the drill bit. A pneumatic mechanism for injecting high-pressure gas into the air nozzles is provided on the drill rod.

[0008] By adopting the above technical solution, the machine body transports the drill rod, equipped with a drill bit and auger blades, to the planned location, aligning and pressing the drill bit against the soil layer. Then, the drill rod drives the drill bit, grinding disc, and auger blades to rotate, causing the drill bit to penetrate the soil layer. The rotating grinding disc drives the blades to cut the soil layer, and the auger blades transport the cut soil to the outside of the pile hole. As the drill bit continues to penetrate, it accumulates a large amount of soil, hindering its penetration. At this point, the drill rod stops rotating, and the pneumatic mechanism is activated. The pneumatic mechanism injects high-pressure gas into the air nozzle, which is then guided to the drill bit, blowing away the soil and minimizing the difficulty of penetrating the soil due to soil buildup, thereby improving the drilling efficiency of the auger drilling machine.

[0009] Optionally, the drill rod and the grinding disc are both hollow and connected. The pneumatic mechanism is located inside the drill rod. A branch pipe is connected to the air nozzle. The air nozzle is located outside the grinding disc. The end of the branch pipe away from the air nozzle passes through the bottom wall of the grinding disc and extends into the grinding disc. The pneumatic mechanism is connected to the branch pipe.

[0010] By adopting the above technical solution, the pneumatic mechanism is located inside the cavity of the drill rod, making it less prone to damage when the drill rod drives the spiral blades and drill bit to drill. When it is necessary to clean the soil off the drill bit, simply activate the pneumatic mechanism. The high-pressure gas generated by the pneumatic mechanism enters the grinding disc through the drill rod, and the pneumatic mechanism injects high-pressure gas into the air nozzle through the branch pipe. The high-pressure gas is then blown to the drill bit through the air nozzle, allowing the soil on the drill bit to be quickly cleaned, thereby ensuring the efficiency of the drill bit penetrating the soil layer.

[0011] Optionally, the branch pipe is ball-jointed and mounted on the bottom wall of the grinding disc, and a control mechanism for controlling the rotation of the branch pipe is provided inside the grinding disc, the control mechanism being electrically connected to the pneumatic mechanism.

[0012] By adopting the above technical solution, the control mechanism can drive the branch pipe to rotate on the bottom wall of the grinding disc, thereby changing the blowing angle of the air nozzle. When the pneumatic mechanism is started, the air nozzle can blow and clean the soil on the drill bit from multiple angles, ensuring the efficiency of the drill bit penetrating the soil layer.

[0013] Optionally, multiple branch pipes are radially distributed along the center of the grinding disc, and ball heads are slidably sleeved on the branch pipes. The bottom wall of the grinding disc has a snap-fit ​​hole for rotatably embedding the ball head. The control mechanism includes a sealing cylinder coaxially arranged with the grinding disc, a piston rod that slides through the side wall of the sealing cylinder in the radial direction of the sealing cylinder, an air pump for pumping gas into / out of the sealing cylinder, and a solenoid valve for controlling the start and stop of the air pump. Multiple branch pipes in the same group distributed in the radial direction of the grinding disc are all hinged to the same piston rod.

[0014] By adopting the above technical solution, the branch pipe is connected to the snap-fit ​​hole on the bottom wall of the grinding disc via a ball joint, and multiple branch pipes are radially distributed on the grinding disc. This allows for easy adjustment of the air nozzle's spray direction by simply activating the solenoid valve, which controls the air pump to inject gas into the sealing cylinder. As the air pressure inside the sealing cylinder increases, the piston rod slides away from the sealing cylinder under the pressure. Because the branch pipe is hinged to the piston rod and its sliding motion is achieved through the ball joint, the piston rod pushes the branch pipe to deflect on the bottom wall of the grinding disc, causing the branch pipe to drive the air nozzle towards the drill bit, thus changing the air nozzle's blowing angle. This allows the air nozzle to clean the soil on the drill bit from multiple angles when the pneumatic mechanism is activated, ensuring the drill bit's efficiency in penetrating the soil. After the soil on the drill bit is cleared, the solenoid valve is activated. The solenoid valve controls the air pump to start, which extracts gas from the sealed cylinder, reducing the air pressure inside. Under this pressure, the piston rod slides closer to the sealed cylinder. The piston rod, through the support rod, drives the air nozzle to deflect away from the drill bit, causing the nozzle to point away from the drill bit. As the drill bit rotates and penetrates the soil, the support pipe pushes the cut soil outwards, further aiding the drill bit's penetration and improving the drilling efficiency of the auger drill.

[0015] Optionally, the control mechanism further includes a signal ring installed on the inner wall of the sealing cylinder, a sensing block embedded in the piston rod for receiving signals from the signal ring, and a processor located on the sealing cylinder. The piston rod slides through the signal ring, and both the solenoid valve and the sensing block are electrically connected to the processor.

[0016] By employing the above technical solution, the processor controls the solenoid valve to start, which in turn drives the air pump to start and stop, thereby quantitatively pumping gas into / out of the sealed cylinder, changing the gas pressure inside the sealed cylinder, and thus adjusting the length of the piston rod extending out of the sealed cylinder to adjust the deflection angle of the branch pipe. Meanwhile, the sensor block on the piston rod receives signals from the signal ring on the inner wall of the sealed cylinder, and transmits these signals to the processor. The processor processes and analyzes these signals to determine the position of the piston rod and the tilt angle of the branch pipe, allowing it to control the air pump via the solenoid valve according to the construction conditions, thereby adjusting the tilt angle of the branch pipe.

[0017] Optionally, a limiting ring is fitted onto the end of the piston rod, and the limiting ring is located inside the sealing cylinder.

[0018] By adopting the above technical solution, the setting of the limiting ring can restrict the piston rod from slipping off the sealing cylinder, ensuring that the piston rod can always slide and be installed on the sealing cylinder, and thus the tilt angle of the branch pipe can be adjusted according to the construction situation.

[0019] Optionally, a cross-shaped valve is embedded at the port of the air nozzle.

[0020] By adopting the above technical solution, the cross valve can prevent soil from entering the air nozzle and clogging it to a certain extent. At the same time, the cross valve is located inside the air nozzle, which can minimize the risk of the cross valve being damaged by soil friction during the rotation of the drill bit into the soil layer.

[0021] Secondly, the construction method for aerated mixing and drilling of cement mixing piles provided in this application adopts the following technical solution:

[0022] A construction method for aerated mixing and drilling of cement mixing piles, based on the aforementioned aerated mixing and drilling device for cement mixing piles, includes the following steps:

[0023] S1, Drilling and positioning: The site is surveyed and the points are located according to the construction plan;

[0024] S2, Construction preparation: The body of the spiral drilling machine will transport the drill rod with spiral blades to the planned location, while aligning the drill bit at the end of the drill rod with the planned location.

[0025] S3, start drilling, drive the drill rod to rotate, the drill rod drives the spiral blades, drill bit and grinding disc to rotate, the drill bit enters the soil layer and the blades on the grinding disc cut the soil layer, and at the same time the cut soil is transported to the outside of the pile hole through the spiral blades.

[0026] S4, clean the drill bit, start the pneumatic mechanism, the pneumatic mechanism rushes high-pressure gas into the air nozzle, the high-pressure gas flows to the drill bit under the guidance of the air nozzle, and blows away the mud on the drill bit.

[0027] S5, Drilling and Grouting: After the drill bit reaches the designed depth, mud is injected into the pile hole, and the drill rod is removed from the pile hole at the same time.

[0028] By adopting the above technical solution, the construction site is first surveyed and the construction points are determined according to the construction plan. Next, the auger drilling rig is driven to the construction site, and the drill bit is aligned with the construction point. The drill rod is then driven to rotate, which in turn drives the auger blades, drill bit, and grinding disc to rotate. The drill bit penetrates the soil layer, and the blades on the grinding disc cut the soil layer. Simultaneously, the cut soil is transported to the outside of the pile hole through the auger blades. During drilling, the drill rod rotation is intermittently stopped, and the soil on the drill bit is cleaned periodically. When the drill rod stops rotating, the pneumatic mechanism is activated, blowing air towards the drill bit through the nozzle to blow away the soil. Drill bit cleaning and drill bit penetration into the soil layer are performed alternately until the pile hole of a certain depth is completed. Finally, mud is injected into the pile hole, and the drill rod is removed from the pile hole.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. As the drill bit continues to penetrate, it becomes covered with a large amount of soil, which obstructs its penetration. At this point, the drill rod stops rotating, the pneumatic mechanism is activated, and high-pressure gas is injected into the air nozzle. The high-pressure gas is guided to the drill bit through the air nozzle, which blows away the soil on the drill bit. This helps to prevent the drill bit from being unable to penetrate the soil layer due to being covered with soil, thereby improving the drilling efficiency of the auger drilling machine.

[0031] 2. The control mechanism can drive the branch pipe to rotate on the bottom wall of the grinding disc, thereby changing the blowing angle of the air nozzle. When the pneumatic mechanism is started, the air nozzle can blow and clean the soil on the drill bit from multiple angles, ensuring the efficiency of the drill bit penetrating the soil layer.

[0032] 3. The cross valve can prevent soil from entering the air nozzle and clogging it to a certain extent. At the same time, the cross valve is located inside the air nozzle to minimize the risk of damage to the cross valve due to friction from soil as the drill bit rotates and penetrates the soil. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of a cement mixing pile aeration mixing hole-forming device according to an embodiment of this application.

[0034] Figure 2 This is a schematic diagram of the structure of the drill rod, spiral blade, drill bit, grinding disc, cutting tool and air nozzle in the embodiments of this application.

[0035] Figure 3 This is a cross-sectional structural diagram of the grinding disc in the embodiments of this application, mainly used to show the pneumatic mechanism, sealing cylinder, piston rod, air pump and solenoid valve.

[0036] Figure 4 This is a cross-sectional view of the sealing cylinder in an embodiment of this application, mainly used to show the piston rod, signal ring, and sensing block.

[0037] Figure 5 This is a schematic flowchart of a construction method for aerated mixing and drilling of cement mixing piles according to an embodiment of this application.

[0038] Reference numerals: 1. Drill rod; 2. Machine body; 21. Transfer section; 22. Robotic arm; 3. Spiral blade; 4. Drill bit; 5. Grinding disc; 6. Blade; 7. Air nozzle; 8. Pneumatic mechanism; 81. Sealing plate; 82. Electric pump; 9. Branch pipe; 10. Control mechanism; 101. Sealing cylinder; 102. Piston rod; 103. Air pump; 104. Solenoid valve; 105. Signal ring; 106. Induction block; 107. Processor; 11. Ball head; 12. Snap-fit ​​hole; 13. Limiting ring; 14. Cross valve; 15. Rotary motor; Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-5This application will be described in further detail.

[0040] This application discloses an aerated mixing and drilling device for cement mixing piles.

[0041] Reference Figure 1 and Figure 2 A cement mixing pile aerated mixing hole-forming device includes a body 2, a drill rod 1, a spiral blade 3, and a drill bit 4. The body 2 includes a transfer part 21 and a mechanical arm 22 mounted on the transfer part 21. The drill rod 1 is rotatably suspended on the end of the mechanical arm 22 away from the transfer part 21, and a rotary motor 15 for driving the drill rod 1 to rotate is provided on the mechanical arm 22. The drill bit 4 is coaxially welded to the end of the drill rod 1 away from the mechanical arm 22, and the tip of the drill bit 4 points away from the drill rod 1. The spiral blade 3 is spirally welded to the drill rod 1, and a grinding disc 5 is coaxially welded and sleeved on the drill rod 1, and the grinding disc 5 is located between the spiral blade 3 and the drill bit 4. Multiple blades 6 for cutting soil layers are installed on the end face of the grinding disc 5 near the drill bit 4. The blades 6 can be one, two, three, four, etc. In order to ensure the cutting effect while taking into account the lightweight design, in this embodiment, two blades 6 are provided. The two blades 6 are coaxially arranged, and the length direction of the two blades 6 is consistent with the radial direction of the grinding disc 5.

[0042] During pile hole forming, the transfer unit 21 moves the robotic arm 22, drill rod 1, spiral blade 3, and drill bit 4 to the designated position; the robotic arm 22 is activated, and the position of the drill rod 1 is adjusted so that the drill bit 4 is aligned with the construction point; then the robotic arm 22 and the rotating mechanism are activated, and the robotic arm 22 presses down on the drill rod 1 so that the drill bit 4 is pressed against and penetrates into the soil layer; at the same time, the rotating mechanism drives the drill rod 1 to rotate, and the drill rod 1 drives the grinding disc 5 and spiral blade 3 to rotate, the grinding disc 5 drives the blade 6 to rotate, the rotating blade 6 cuts the soil layer, and the rotating spiral blade 3 spirally transports the cut soil to the outside of the pile hole.

[0043] As drill bit 4 gradually penetrates, it becomes covered with a large amount of soil, hindering its penetration and affecting the drilling efficiency of the auger drill. Therefore, referring to... Figure 2 and Figure 3Both the drill rod 1 and the grinding disc 5 are hollow and interconnected. Multiple air nozzles 7 for blowing air into the drill bit 4 are installed on the end face of the grinding disc 5 near the drill bit 4. The air nozzles 7 are connected to the cavity of the grinding disc 5. To minimize the risk of soil entering and clogging the air nozzles 7, a cross-shaped valve 14 is embedded at the port of each air nozzle 7. Simultaneously, a pneumatic mechanism 8 is installed inside the drill rod 1 to inject high-pressure gas into the air nozzles 7. The pneumatic mechanism 8 includes a sealing plate 81 welded to the inner wall of the drill rod 1 and an electric pump 82 mounted on the sealing plate 81. The sealing plate 81 is located on the side of the grinding disc 5 away from the drill bit 4, and the electric pump 82 is located on the side of the sealing plate 81 away from the grinding disc 5. The outlet end of the electric pump 82 passes through the sealing plate 81 and communicates with the grinding disc 5. The gas pumped by the electric pump 82 flows through the grinding disc 5 to the air nozzles 7 and overflows from the air nozzles 7.

[0044] When the drill bit 4 is covered with a large amount of soil, the mechanical arm 22 and the rotating mechanism can be stopped, and the electric pump 82 can be started. The electric pump 82 injects high-pressure gas into the air nozzle 7 through the grinding disc 5. The high-pressure gas is guided to the drill bit 4 through the air nozzle 7, so that the soil on the drill bit 4 is blown away, thus avoiding the drill bit 4 being unable to penetrate the soil layer due to being covered with soil as much as possible, thereby improving the drilling efficiency of the auger drilling machine.

[0045] To achieve efficient cleaning of drill bit 4, the blowing angle of air nozzle 7 is adjustable, as shown in the following figure. Figure 2 and Figure 3 Multiple locking holes 12 are provided on the bottom wall of the grinding disc 5, each corresponding to a different air nozzle 7. These locking holes 12 are radially distributed along the center of the bottom wall of the grinding disc 5. The inner wall of each locking hole 12 is arc-shaped, and the diameter of the hole gradually decreases from the center to both ends. A branch pipe 9 is welded to the large-diameter end of each air nozzle 7. A ball head 11 is slidably fitted onto the branch pipe 9. The ball head 11 rotates and embeds itself in the locking hole 12 on the bottom wall of the grinding disc 5, thus hinged the branch pipe 9 to the bottom wall of the grinding disc 5. At this time, the air nozzle 7 is located outside the grinding disc 5, and the end of the branch pipe 9 away from the air nozzle 7 passes through the bottom wall of the grinding disc 5 and extends into the grinding disc 5. This allows the gas pumped by the electric pump 82 to first enter the grinding disc 5, then flow through the branch pipe 9 to the air nozzle 7. With the continuous pumping pressure of the electric pump 82, the high-pressure gas rapidly overflows from the air nozzle 7.

[0046] To ensure that as much of the rapidly overflowing gas as possible reaches drill bit 4, it is necessary to drive branch pipe 9 to deflect air nozzle 7 towards drill bit 4. Therefore, refer to... Figure 3 and Figure 4The grinding disc 5 is equipped with a control mechanism 10 for controlling the rotation of the branch pipe 9. The control mechanism 10 includes a sealing cylinder 101, multiple piston rods 102 that slide through the sealing cylinder 101, an air pump 103 for pumping gas into / out of the sealing cylinder 101, a solenoid valve 104 for controlling the start and stop of the air pump 103, multiple signal rings 105 installed on the inner wall of the sealing cylinder 101, a sensing block 106 embedded in the piston rods 102 for receiving signals from the signal rings 105, and a processor 107 located on the sealing cylinder 101.

[0047] Reference Figure 3 and Figure 4 The sealing cylinder 101 is located inside the grinding disc 5 and is coaxially welded and fixed to the inner bottom wall of the grinding disc 5; the number of piston rods 102 is consistent with the number of radially distributed multiple sets of snap-fit ​​holes 12, and the length direction of the piston rod 102 is consistent with the distribution direction of the multiple snap-fit ​​holes 12 in the same group. The multiple branch pipes 9 in the same group distributed along the radial direction of the grinding disc 5 are all hinged to the same piston rod 102. Multiple through holes adapted to the sliding movement of piston rod 102 are provided on the side wall of sealing cylinder 101, and each through hole corresponds to a piston rod 102. A sealing ring is bonded to the inner wall of the through holes on the side wall of sealing cylinder 101. The end of piston rod 102 away from branch pipe 9 slides through the through holes along the radial direction of sealing cylinder 101, passing through the side wall of sealing cylinder 101 and the sealing ring. The sealing ring seals and covers piston rod 102. To prevent piston rod 102 from slipping off sealing cylinder 101, a limiting ring 13 is bonded and sleeved to the end of piston rod 102 away from branch pipe 9. The limiting ring 13 is a ring-shaped body made of rubber and is located inside sealing cylinder 101. When piston rod 102 moves away from sealing cylinder 101, limiting ring 13 can press against the inner wall of sealing cylinder 101, thereby restricting piston rod 102 from slipping off sealing cylinder 101.

[0048] Reference Figure 3 and Figure 4 Multiple signal rings 105 correspond one-to-one with multiple perforations, and the signal rings 105 are riveted and fixed to the inner sidewall of the sealing cylinder 101 at the perforations. The piston rod 102 is disposed through the signal rings 105. Multiple sensing blocks 106 are also provided, each corresponding one-to-one with a piston rod 102, and the sensing blocks 106 are embedded in the sidewall of one side of the piston rod 102. To achieve continuous monitoring of the position of the piston rod 102, the sensing blocks 106 are designed as elongated strips, with the length direction of the sensing blocks 106 consistent with the length direction of the piston rod 102, and the sensing blocks 106 are located at the end of the piston rod 102 closest to the sealing cylinder 101. The air pump 103 with a solenoid valve 104 and the processor 107 are both fixedly installed on the top of the sealing cylinder 101, and the solenoid valve 104, the sensing blocks 106, and the electric pump 82 are all electrically connected to the processor 107.

[0049] When the drill bit 4 needs to be purged and cleaned, the processor 107 simply drives the solenoid valve 104 to start, which in turn controls the air pump 103 to start. The air pump 103 injects a metered amount of gas into the sealing cylinder 101. As the air pressure inside the sealing cylinder 101 increases, the piston rod 102 slides away from the sealing cylinder 101 under the action of the air pressure. The piston rod 102 pushes the branch pipe 9 to deflect on the bottom wall of the grinding disc 5, causing the branch pipe 9 to drive the air nozzle 7 toward the drill bit 4. When the piston rod 102 slides, the signal emitted by the signal ring 105 is received by the elongated sensing block 106. The sensing block 106 transmits this signal to the processor 107 for analysis and processing, which determines the length of the piston rod 102 extending out of the sealing cylinder 101. This allows the air nozzle 7 to be quickly adjusted to a suitable deflection angle. At the same time, the processor 107 can analyze and determine the position of the piston rod 102 and promptly drive the electric pump 82 to start, so as to quickly and efficiently purge and clean the drill bit 4. During the purging and cleaning of drill bit 4, processor 107 controls the piston rod 102 to deflect the air nozzle 7 away from drill bit 4 via the support rod, causing the air nozzle 7 to point away from drill bit 4. As drill bit 4 rotates and penetrates the soil, the support pipe 9 also pushes the cut soil in all directions, which helps drill bit 4 penetrate further and thus improves the drilling efficiency of the auger drill.

[0050] The implementation principle of the cement mixing pile aerated mixing hole forming device in this application embodiment is as follows: The machine body 2 transports the drill rod 1 with drill bit 4 and spiral blade 3 to the planned location, so that the drill bit 4 is aligned and pressed against the soil layer; then the drill rod 1 drives the drill bit 4, grinding disc 5 and spiral blade 3 to rotate, the drill bit 4 enters the soil layer, the rotating grinding disc 5 drives the blade 6 to cut the soil layer, and the spiral blade 3 transports the cut soil to the outside of the pile hole.

[0051] When it is found that the drill bit 4 is covered with a large amount of mud, the rotation of the drill rod 1 can be stopped first. The processor 107 drives the solenoid valve 104 to start, and the solenoid valve 104 controls the air pump 103 to start. The air pump 103 injects a metered amount of gas into the sealing cylinder 101. As the air pressure in the sealing cylinder 101 increases, the piston rod 102 is pushed to move away from the sealing cylinder 101. The sliding piston rod 102 pushes the branch pipe 9 to deflect on the bottom wall of the grinding disc 5. After analyzing the signal received by the sensing block 106, the processor 107 controls the start and stop of the air pump 103 through the solenoid valve 104, so that the branch pipe 9 drives the air nozzle 7 to quickly rotate to a suitable angle, so that the air nozzle 7 is stably facing the drill bit 4. Subsequently, the processor 107 drives the electric pump 82 to start. The electric pump 82 injects high-pressure gas into the air nozzle 7 through the grinding disc 5. The high-pressure gas is guided to the drill bit 4 through the air nozzle 7, so that the soil on the drill bit 4 is blown away, so as to avoid the drill bit 4 being unable to penetrate the soil layer due to being covered by soil, thereby improving the drilling efficiency of the auger drilling machine.

[0052] This application also discloses a construction method for aerated mixing and drilling of cement mixing piles.

[0053] Reference Figure 5 The construction method for aerated mixing and drilling of cement mixing piles includes the following steps:

[0054] S1, Drilling and positioning: The site is surveyed and the points are located according to the construction plan;

[0055] S2, Construction preparation: The body 2 of the spiral drilling machine transports the drill rod 1 with spiral blades 3 to the planned location, while aligning the drill bit 4 at the end of the drill rod 1 with the planned location.

[0056] S3, start drilling, drive drill rod 1 to rotate, drill rod 1 drives spiral blade 3, drill bit 4 and grinding disc 5 to rotate, drill bit 4 enters the soil layer and blade 6 on grinding disc 5 cuts the soil layer, and at the same time the cut soil is transported to the outside of the pile hole through spiral blade 3.

[0057] S4, clean drill bit 4, start pneumatic mechanism 8, pneumatic mechanism 8 rushes high pressure gas into air nozzle 7, high pressure gas flows to drill bit 4 under the guidance of air nozzle 7, blows and cleans the mud on drill bit 4.

[0058] S5, Drilling and Grouting: After the drill bit 4 drills to the designed depth, mud is injected into the pile hole, and at the same time, the drill rod 1 is removed from the pile hole.

[0059] The implementation principle of the construction method for aerated mixing and drilling of cement mixing piles according to the embodiments of this application is as follows: First, according to the construction plan, the construction site is surveyed and the construction points are determined. Then, the spiral drilling machine is driven to the construction site, and the drill bit 4 is aligned with the construction point. Then, the drill rod 1 is driven to rotate, which drives the spiral blades 3, the drill bit 4, and the grinding disc 5 to rotate. The drill bit 4 penetrates the soil layer, and the blades 6 on the grinding disc 5 cut the soil layer. At the same time, the cut soil is transported to the outside of the pile hole through the spiral blades 3. During drilling, the rotation of the drill rod 1 is intermittently stopped, and the soil on the drill bit 4 is cleaned periodically. When the drill rod 1 stops rotating, the pneumatic mechanism 8 is activated. The pneumatic mechanism 8 blows air towards the drill bit 4 through the air nozzle 7, thereby blowing away the soil on the drill bit 4. The cleaning of the drill bit 4 and the penetration of the drill bit 4 into the soil layer are carried out alternately until the construction of a pile hole of a certain depth is completed. Finally, mud is injected into the pile hole, and the drill rod 1 is removed from the pile hole.

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cement mixing pile aerated mixing hole forming device, comprising a machine body (2), a drill pipe (1), a spiral blade (3) and a drill bit (4), characterized in that: The drill rod (1) is fixedly sleeved with a grinding disc (5), the grinding disc (5) is located between the spiral blade (3) and the drill bit (4), a plurality of cutting blades (6) are installed on the end face of the grinding disc (5) close to the drill bit (4), a plurality of air nozzles (7) for blowing the drill bit (4) are also installed on the end face of the grinding disc (5) close to the drill bit (4), and the drill rod (1) is provided with a pneumatic mechanism (8) for injecting high-pressure gas into the air nozzle (7). The drill rod (1) and the grinding disc (5) are hollow and are in communication, the pneumatic mechanism (8) is located in the drill rod (1), the air nozzle (7) is in communication with a branch pipe (9), the air nozzle (7) is located outside the grinding disc (5), one end of the branch pipe (9) away from the air nozzle (7) penetrates the bottom wall of the grinding disc (5) and extends into the grinding disc (5), and the pneumatic mechanism (8) is in communication with the branch pipe (9). The branch pipe (9) is ball-hinged to the bottom wall of the grinding disc (5), the grinding disc (5) is provided with a control mechanism (10) for controlling the rotation of the branch pipe (9), and the control mechanism (10) is electrically connected with the pneumatic mechanism (8). A plurality of branch pipes (9) are radially distributed along the center of the grinding disc (5), a ball head (11) is slidably sleeved on the branch pipe (9), a clamping hole (12) for rotating and embedding the ball head (11) is formed in the bottom wall of the grinding disc (5), and the control mechanism (10) comprises a sealing cylinder (101) coaxially arranged with the grinding disc (5), a piston rod (102) slidably penetrating the side wall of the sealing cylinder (101) in the radial direction of the sealing cylinder (101), a gas pump (103) for pumping gas into / out of the sealing cylinder (101), and an electromagnetic valve (104) for controlling the start and stop of the gas pump (103), and a plurality of branch pipes (9) in the same group distributed in the radial direction of the grinding disc (5) are hinged to the same piston rod (102).

2. The aerated cement mixing pile hole-forming device according to claim 1, characterized in that: The control mechanism (10) further comprises a signal ring (105) mounted on the inner wall of the sealing cylinder (101), an induction block (106) embedded on the piston rod (102) and used for receiving the signal of the signal ring (105), and a processor (107) located on the sealing cylinder (101), the piston rod (102) slides through the signal ring (105), and the electromagnetic valve (104) and the induction block (106) are electrically connected with the processor (107).

3. The aerated mixing pile and cement mixing hole forming device according to claim 1, characterized in that: The end of the piston rod (102) is sleeved with a limiting ring (13), and the limiting ring (13) is located in the sealing cylinder (101).

4. The aerated mixing pile and cement mixing hole forming device according to claim 1, characterized in that: A cross valve (14) is embedded in the port of the air nozzle (7).

5. A construction method of aerated cement mixing pile, based on the aerated cement mixing pile device according to any one of claims 1-4, characterized in that: The method comprises the following steps: S1, drilling positioning, measuring and mapping points on the site according to the construction scheme; S2, construction preparation, the body (2) of the spiral drilling machine transports the drill rod (1) with the spiral blade (3) to the planned point, and the drill bit (4) at the end of the drill rod (1) is aligned with the planned point. S3, start drilling, drive the drill rod (1) to rotate, the drill rod (1) drives the spiral blade (3), the drill bit (4) and the grinding disc (5) to rotate, the drill bit (4) penetrates into the soil layer and the cutter (6) on the grinding disc (5) cuts the soil layer, and the cut soil is transported to outside the pile hole through the spiral blade (3); S4, clean the drill bit (4), start the pneumatic mechanism (8), the pneumatic mechanism (8) blows high-pressure gas into the air nozzle (7), the high-pressure gas flows to the drill bit (4) under the guidance of the air nozzle (7), and the soil on the drill bit (4) is cleaned; S5, drill hole grouting, after the drill bit (4) drills to the designed depth, mud is injected into the pile hole, and the drill rod (1) is taken out of the pile hole.

Images