A high-speed deep mixing drill bit and use method thereof

Abstract

The invention discloses a high-speed deep mixing drill bit and a method for using the same, which belongs to the technical field of construction engineering, and includes a main drill rod, a first-level mixing blade, a second-level compound mixing blade, a third-level compound mixing blade, a fourth-level compound mixing blade, an expander, a guide ring, a drill tip, a drill tooth, a driving guide rod, a driving oil cylinder, and an advance drill rod; the expander includes a positioning sleeve, a wear-resistant sleeve, a connecting key, an expansion blade, and a strong electromagnetic device; a high-speed deep mixing drill bit is used for construction, and the main construction steps are as follows: the drill bit is installed and debugged in place; the drilling and mixing are started; the drilling and mixing construction is dynamically adjusted; the drilling and mixing are started; the drilling and mixing construction is dynamically adjusted; and the mixing construction operation is completed. The invention solves the technical problems of being unable to stir, unevenly stirred, misguided, and difficult to expand the diameter by setting an advance drill rod, installing a driving guide rod on the advance drill rod, setting an expander, and installing a guide ring.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a high-speed deep mixing drill bit and a use method thereof. Background Art

[0002] Cement-soil deep mixing pile is a method for reinforcing soft soil foundation. It uses cement as a curing agent. Through a special mixing machine and slurry pump, the soft soil and curing agent are forced to mix and mix deep in the foundation. A series of physical and chemical reactions between the curing agent and the soft soil are used to harden the soft soil into a composite foundation with integrity, water stability and high foundation bearing capacity. There is a core tube on the mixer, and its head has blades. When the mixer rotates, cement slurry is sprayed out through the spraying port at the end of the core tube, and mixed with the soil loosened by the rotating blades to form a cement reinforcement body. The mixing drill bit is an important part of the deep mixer. It directly affects the uniformity of the deep mixing pile formed by the mixture of cement slurry and soft soil, and determines the reinforcement effect of the foundation.

[0003] At present, there are four prominent problems in deep mixing construction: (1) Stirring is difficult. When drilling into a sand layer with a large standard penetration, it is difficult for a traditional mixing drill bit to break through the sand layer with a large degree of cementation, resulting in problems such as supporting the drill and drilling deviation; (2) Stirring is uneven. During deep mixing construction, as the drill bit drills down, the gravity of the overlying soil becomes greater and greater. In addition, the deeper the soil layer, the denser it is. Therefore, it is difficult for traditional drilling methods to achieve rapid mixing, resulting in a low degree of mixing between the solidified material and the in-situ soil, and poor integrity of the pile body; (3) Misguidance. The mixing pile process generally relies on the weight of the drill rod and the power head to provide downward pressure. When the soil layer conditions of the local strata vary greatly, the drill bit is likely to deviate in the direction of poor soil quality, causing the drill hole to tilt; (4) Difficult to expand the diameter. Traditional mixing piles can only achieve pile foundation construction of one diameter with one drill bit. When encountering different strata, it is necessary to increase the bearing capacity of the pile body by changing the pile diameter. Mechanical expansion drilling is prone to mechanical failure, and the construction quality cannot be guaranteed. Therefore, in order to solve the above problems, the present invention proposes a high-speed deep mixing drill bit and a method for using it. Summary of the invention

[0004] In view of the above technical problems existing in the prior art, the present invention proposes a high-speed deep mixing drill bit and a method for using the same, which overcomes the shortcomings of the prior art. By setting an advance drill rod and installing a driving guide rod on the advance drill rod to drive the extension and retraction of the first-stage mixing blade, advance construction is carried out when drilling at the deepest depth. The advance construction mixing diameter is small, and after the mixing of the remixing blades, the problem of supporting the drill is successfully solved; by setting an expander and applying a strong electromagnetic device to the drill bit, an electric drive hole expansion scheme is realized, and the location and length of the hole expansion can be precisely controlled; by installing a guide ring on the second-stage remixing blade, the drill bit is not easy to tilt when encountering soft and hard intersecting soil layers.

[0005] A high-speed deep mixing drill bit comprises a main drill rod, a primary mixing blade, a secondary compound mixing blade, a tertiary compound mixing blade, a quaternary compound mixing blade, an expander, a guide ring, a drill tip, a drill tooth, a drive guide rod, a drive oil cylinder, and an advance drill rod; the expander comprises a positioning sleeve, a wear-resistant sleeve, a connecting key, a body expander blade, and a strong electromagnetic device; the primary mixing blade and the advance drill rod are connected in an articulated form; the primary mixing blade and the drive guide rod, and the drive guide rod and the advance drill rod are connected by welding; the drill tip and the advance drill rod are connected by welding; the secondary compound mixing blade, the tertiary compound mixing blade, the quaternary compound mixing blade and the main drill rod are all connected by welding; the primary mixing blade and the secondary compound mixing blade are both welded with drill teeth, and the guide ring is connected to the secondary compound mixing blade by welding. The stirring blades are connected, and expanders are installed between the secondary compound stirring blades and the tertiary compound stirring blades, and between the tertiary compound stirring blades and the quaternary compound stirring blades. The positioning sleeve is connected to the drill rod by welding, and the positioning sleeve is connected to the wear-resistant sleeve by a slide groove. The wear-resistant sleeve is connected to the connecting key by welding, and the connecting key is connected to the expanding blade by bolts; the advance drill rod is arranged inside the main drill rod, and the advance drill rod and the main drill rod are connected with two independent power heads of the drilling rig respectively; the positioning sleeve, wear-resistant sleeve, connecting key, expanding blade, and advance drill rod are all made of magnetic materials, and torque sensors are arranged on the top of the advance drill rod and the main drill rod; the length of the expander is not less than the length of the secondary compound stirring blade, the tertiary compound stirring blade, and the quaternary compound stirring blade.

[0006] Preferably, the driving guide rod is driven by hydraulic oil. After the positive pressure is supplied, the driving guide rod pushes the first-level stirring blade to expand toward the outside of the advance drill rod. After the reverse pressure is supplied, the driving guide rod drives the first-level stirring blade to shrink toward the inside of the advance drill rod. The angle between the first-level stirring blade and the advance drill rod varies in the range of 5°-90°.

[0007] Preferably, the driving cylinder is arranged on the upper part of the driving guide rod and is welded to the driving guide rod. The driving cylinder is driven by hydraulic oil. After forward pressure is applied, the driving cylinder pushes the advance drill rod to extend forward by a set length. After backward pressure is applied, the driving cylinder pulls the advance drill rod to retract backward by a set length. The maximum length of the advance drill rod extending forward and retracting backward is 1.0 times the length of the advance drill rod.

[0008] Preferably, the strong electromagnetic device is fixed to the inner wall of the main drill pipe and is located at the same horizontal height as the expander. The strong electromagnetic device is an electromagnetic strong magnet. When powered on, the electromagnetic strong magnet has high magnetism and can absorb surrounding magnetic materials. After power is off, the electromagnetic strong magnet has no magnetism.

[0009] Preferably, the diameter of the advance drill rod is smaller than the diameter of the main drill rod, the diameter of the advance drill rod is 10 cm to 20 cm, and the length of the advance drill rod is 1 m to 3 m.

[0010] Preferably, the wear-resistant sleeve is a hollow cylindrical structure, and solid lubricant is applied to the position of the wear-resistant sleeve before drilling. When the maximum wear of the wear-resistant sleeve exceeds 2 mm, it should be replaced in time.

[0011] Preferably, the guide ring is a circular ring structure, the radius of the guide ring is equal to the length of the secondary mixing blade, the width of the guide ring is 10 cm to 20 cm, and the thickness of the guide ring is 5 mm to 10 mm.

[0012] Preferably, the primary stirring blades are composed of three stirring blades, and the angle between the projections of two adjacent stirring blades on the horizontal plane is 120°.

[0013] A method for using a high-speed deep mixing drill bit, using the following steps for construction:

[0014] Step 1: Install and debug the drill bit;

[0015] Prepare the high-speed deep mixing drill bit, start the power system, test run the high-speed deep mixing drill bit for 5-10 minutes, test the reliability of the torque sensor, strong electromagnetic device, and expander, move the high-speed deep mixing drill bit to the set position, adjust the angle between the first-level mixing blade and the lead drill rod to 30°-60°, and keep the drive cylinder pulling the lead drill rod backward to a fully retracted state;

[0016] Step 2: Start drilling and stirring;

[0017] At the same time, the main drill rod and the advance drill rod are driven to rotate forward and move vertically downward, and the construction is carried out according to the designed rotation speed, the designed main drill rod rotation driving force, and the designed advance drill rod rotation driving force. The main drill rod and the advance drill rod maintain the same rotation speed, and the strong electromagnetic device is turned off so that the expansion blade and the main drill rod do not rotate synchronously. At the same time, the torque of the advance drill rod and the main drill rod is monitored by a torque sensor, and the solidified material is sprayed according to the design requirements;

[0018] Step 3: Dynamic adjustment of drilling and mixing construction;

[0019] When the torque of the lead drill pipe is less than or equal to 50% of the rated torque, the angle between the first-stage stirring blade and the lead drill pipe is maintained at 30°-60°, the speed of the lead drill pipe remains unchanged at the original design speed, and the rotational driving force of the lead drill pipe remains unchanged at the original design rotational driving force;

[0020] When the torque of the lead drill pipe is greater than 50% of the rated torque and less than 80% of the rated torque, the guide rod is driven to drive the first-stage stirring blade to retract into the lead drill pipe after the reverse pressure is fed, so that the angle between the first-stage stirring blade and the lead drill pipe is maintained at 20°-30°, the speed of the lead drill pipe is reduced to 70%-90% of the design speed, and the rotational driving force of the lead drill pipe is increased to 120%-150% of the design rotational driving force;

[0021] When the torque of the lead drill pipe is greater than or equal to 80% of the rated torque, the guide rod is driven to drive the first-stage stirring blade to retract into the lead drill pipe after the reverse pressure is fed, and the angle between the first-stage stirring blade and the lead drill pipe is maintained at 5°-20°, reducing the speed of the lead drill pipe to 40%-70% of the design speed, and increasing the rotational driving force of the lead drill pipe to 150%-200% of the design rotational driving force;

[0022] Step 4: Start to stir with the drill;

[0023] When the high-speed deep mixing drill bit mixes downward to the set depth, the angle between the first-stage mixing blade and the advance drill pipe is adjusted to 30°-60°, and the driving cylinder is adjusted to pull the advance drill pipe backward to a fully retracted state, and at the same time, the main drill pipe and the advance drill pipe are driven to rotate in the opposite direction and move vertically upward. The construction is carried out according to the designed rotation speed, the designed main drill pipe rotation driving force, and the designed advance drill pipe rotation driving force. The main drill pipe and the advance drill pipe maintain the same rotation speed, and the strong electromagnetic device is turned off so that the expansion blade and the main drill pipe do not rotate synchronously. At the same time, the torque sensor is used to monitor the torque of the advance drill pipe and the main drill pipe, and the solidified material is sprayed according to the design requirements;

[0024] Step 5: Dynamic adjustment of drilling and mixing construction;

[0025] When the torque of the main drill pipe is less than or equal to 50% of the rated torque, the strong electromagnetic device is started, and the expansion blade and the main drill pipe are relatively fixed and rotate synchronously through strong electromagnetic suction;

[0026] When the torque of the main drill pipe is between 50% and 100% of the rated torque, the original state remains unchanged;

[0027] When the torque of the main drill pipe is greater than or equal to 100% of the rated torque, the strong electromagnetic device is turned off so that the expansion blades and the main drill pipe do not rotate synchronously;

[0028] Step 6: When the high-speed deep mixing drill bit mixes upward to the set depth, the mixing construction operation is completed.

[0029] Preferably, during the dynamic adjustment of the drilling and mixing construction in step 3, the following conditions are met at the same time:

[0030] When the stirring drilling speed is greater than or equal to the set drilling speed, the driving cylinder is kept pulling the leading drill rod backward to a fully retracted state;

[0031] When the stirring drilling speed is greater than or equal to 80% of the set drilling speed and less than the set drilling speed, keep the driving cylinder pulling the leading drill rod backward to a fully retracted state;

[0032] When the stirring drilling speed is greater than 50% of the set drilling speed and less than 80% of the set drilling speed, the driving cylinder pushes the leading drill rod forward to extend to 50% of the maximum length;

[0033] When the stirring drilling speed is less than 80% of the set drilling speed, the driving cylinder is kept pulling the advance drill rod, and the driving cylinder pushes the advance drill rod forward to extend to the maximum length.

[0034] Beneficial technical effects brought by the present invention:

[0035] By setting up an advance drill rod and installing a driving guide rod on the advance drill rod, the first-stage mixing blade is driven to extend and retract, and advance construction is carried out when drilling at the deepest point. The mixing diameter of the advance construction is smaller, and the problem of supporting the drill is successfully solved after being stirred by the re-mixing blades. By setting up an expander and applying a strong electromagnetic device to the drill bit, an electric-driven hole expansion solution is realized, and the location and length of the expanded hole can be precisely controlled. By installing a guide ring on the second-stage re-mixing blade, the drill bit is not easily tilted when encountering soft and hard soil layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The present invention is a schematic structural diagram of a high-speed deep-layer stirring drill bit and a stirring drill bit in a method for using the same.

[0037] Figure 2 The present invention is a schematic structural diagram of a body expander in a high-speed deep mixing drill bit and a method for using the same.

[0038] Figure 3 The present invention provides a high-speed deep-layer stirring drill bit and a stirring drill bit in a method for using the same.

[0039] Among them, 1-main drill rod, 2-first-stage mixing blade, 3-second-stage compound mixing blade, 4-third-stage compound mixing blade, 5-fourth-stage compound mixing blade, 6-expander, 7-guide ring, 8-drill tip, 9-drill tooth, 61-positioning sleeve, 62-wear-resistant sleeve, 63-connecting key, 64-expanding blade, 65-strong electromagnetic device, 10-driving guide rod, 11-driving cylinder, 12-advanced drill rod. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Embodiment 1:

[0041] like Figures 1 to 3 As shown, a high-speed deep mixing drill bit comprises a main drill rod 1, a primary mixing blade 2, a secondary compound mixing blade 3, a tertiary compound mixing blade 4, a quaternary compound mixing blade 5, an expander 6, a guide ring 7, a drill tip 8, a drill tooth 9, a driving guide rod 10, a driving cylinder 11, and an advance drill rod 12; the expander 6 comprises a positioning sleeve 61, a wear-resistant sleeve 62, a connecting key 63, a body expander blade 64, and a strong electromagnetic device 65; the primary mixing blade 2 and the advance drill rod 12 are connected in an articulated manner; the primary mixing blade 2 and the driving guide rod 10, and the driving guide rod 10 and the advance drill rod 12 are connected by welding; the drill tip 8 and the advance drill rod 12 are connected by welding; the secondary compound mixing blade 3, the tertiary compound mixing blade 4, the quaternary compound mixing blade 5 and the main drill rod 1 are all connected by welding; the primary mixing blade 2 and the secondary compound mixing blade 3 are both welded with drill teeth 9, and the guide ring 7 is welded by welding. It is connected to the secondary remixing blade 3, and an expander 6 is installed between the secondary remixing blade and the tertiary remixing blade, and between the tertiary remixing blade and the quaternary remixing blade. The positioning sleeve 61 is connected to the drill rod by welding, and the positioning sleeve 61 is connected to the wear-resistant sleeve 62 by a slide groove, and the wear-resistant sleeve 62 is connected to the connecting key 63 by welding, and the connecting key 63 is connected to the expanding blade 64 by bolts; the advance drill rod 12 is arranged inside the main drill rod 1, and the advance drill rod 12 and the main drill rod 1 are connected with two independent power heads of the drilling rig respectively; the positioning sleeve 61, the wear-resistant sleeve 62, the connecting key 63, the expanding blade 64, and the advance drill rod 12 are all made of magnetic materials, and torque sensors are arranged on the top of the advance drill rod 12 and the main drill rod 1; the length of the expander 6 is not less than the length of the secondary remixing blade 3, the tertiary remixing blade 4, and the quaternary remixing blade 5.

[0042] Preferably, the driving guide rod 10 is driven by hydraulic oil. After the positive pressure is supplied, the driving guide rod 10 pushes the first-stage stirring blade 2 to expand toward the outside of the advance drill rod 12. After the reverse pressure is supplied, the driving guide rod 10 drives the first-stage stirring blade 2 to shrink toward the inside of the advance drill rod 12. The angle between the first-stage stirring blade 2 and the advance drill rod 12 varies in the range of 5°-90°.

[0043] Preferably, the driving cylinder 11 is arranged on the upper part of the driving guide rod 10 and is welded to the driving guide rod 10. The driving cylinder 11 is driven by hydraulic oil. After applying forward pressure, the driving cylinder 11 pushes the advance drill rod 12 to extend forward by a set length. After applying backward pressure, the driving cylinder 11 pulls the advance drill rod 12 to retract backward by a set length. The maximum length of the advance drill rod 12 extending forward and retracting backward is 1.0 times the length of the advance drill rod 12.

[0044] Preferably, the strong electromagnetic device 65 is fixed to the inner wall of the main drill rod 1, and is located at the same horizontal height as the expander 6. The strong electromagnetic device 65 is an electromagnetic strong magnet. When powered on, the electromagnetic strong magnet has high magnetism and can absorb surrounding magnetic materials. After power is off, the electromagnetic strong magnet has no magnetism.

[0045] Preferably, the diameter of the advance drill rod 12 is smaller than the diameter of the main drill rod 1, the diameter of the advance drill rod 12 is 10 cm to 20 cm, and the length of the advance drill rod 12 is 1 m to 3 m.

[0046] Preferably, the wear-resistant sleeve 62 is a hollow cylindrical structure. Solid lubricant is applied to the position of the wear-resistant sleeve 62 before drilling. When the maximum wear of the wear-resistant sleeve 62 exceeds 2 mm, it should be replaced in time.

[0047] Preferably, the guide ring 7 is a circular ring structure, the radius of the guide ring 7 is equal to the length of the secondary mixing blade 3, the width of the guide ring 7 is 10 cm to 20 cm, and the thickness of the guide ring 7 is 5 mm to 10 mm.

[0048] Preferably, the primary stirring blade 2 is composed of three stirring blades, and the angle between the projections of two adjacent stirring blades on the horizontal plane is 120°. Embodiment 2:

[0049] like Figures 1 to 3 A method for using a high-speed deep mixing drill bit is shown in the following steps:

[0050] Step 1: Install and debug the drill bit;

[0051] Prepare the high-speed deep mixing drill bit in place, start the power system, test run the high-speed deep mixing drill bit for 5-10 minutes, test the reliability of the torque sensor, the strong electromagnetic device 65, and the expander 6, move the high-speed deep mixing drill bit to the set position, adjust the angle between the first-level mixing blade 2 and the advance drill rod 12 to 30°-60°, and keep the driving cylinder 11 pulling the advance drill rod 12 backward to a fully retracted state;

[0052] Step 2: Start drilling and stirring;

[0053] At the same time, the main drill rod 1 and the advance drill rod 12 are driven to rotate in the forward direction and move vertically downward, and the construction is carried out according to the designed rotation speed, the designed rotation driving force of the main drill rod 1, and the designed rotation driving force of the advance drill rod 12. The main drill rod 1 and the advance drill rod 12 maintain the same rotation speed, and the strong electromagnetic device 65 is turned off so that the expansion blade 64 and the main drill rod 1 do not rotate synchronously. At the same time, the torque of the advance drill rod 12 and the main drill rod 1 is monitored by a torque sensor, and the solidified material is sprayed according to the design requirements;

[0054] Step 3: Dynamic adjustment of drilling and mixing construction;

[0055] When the torque of the advance drill rod 12 is less than or equal to 50% of the rated torque, the angle between the first-stage stirring blade 2 and the advance drill rod 12 is maintained at 30°-60°, the speed of the advance drill rod 12 remains unchanged at the original design speed, and the rotational driving force of the advance drill rod 12 remains unchanged at the original design rotational driving force;

[0056] When the torque of the lead drill rod 12 is greater than 50% of the rated torque and less than 80% of the rated torque, the guide rod 10 is driven to drive the first-stage stirring blade 2 to retract into the lead drill rod 12 after the reverse pressure is fed, so that the angle between the first-stage stirring blade 2 and the lead drill rod 12 is maintained at 20°-30°, the rotation speed of the lead drill rod 12 is reduced to 70%-90% of the design rotation speed, and the rotation driving force of the lead drill rod 12 is increased to 120%-150% of the design rotation driving force;

[0057] When the torque of the lead drill rod 12 is greater than or equal to 80% of the rated torque, the guide rod 10 is driven to drive the first-stage stirring blade 2 to retract into the lead drill rod 12 after the reverse pressure is fed, and the angle between the first-stage stirring blade 2 and the lead drill rod 12 is maintained at 5°-20°, the rotation speed of the lead drill rod 12 is reduced to 40%-70% of the design rotation speed, and the rotation driving force of the lead drill rod 12 is increased to 150%-200% of the design rotation driving force;

[0058] Step 4: Start to stir with the drill;

[0059] When the high-speed deep mixing drill bit stirs downward to the set depth, the angle between the first-level mixing blade 2 and the advance drill rod 12 is adjusted to 30°-60°, and the driving cylinder 11 is adjusted to pull the advance drill rod 12 backward to a fully retracted state, and at the same time, the main drill rod 1 and the advance drill rod 12 are driven to rotate in the opposite direction and move vertically upward, and the construction is carried out according to the designed rotation speed, the designed rotation driving force of the main drill rod 1, and the designed rotation driving force of the advance drill rod 12. The main drill rod 1 and the advance drill rod 12 maintain the same rotation speed, and the strong electromagnetic device 65 is turned off so that the expansion blade 64 and the main drill rod 1 do not rotate synchronously. At the same time, the torque sensor is used to monitor the torque of the advance drill rod 12 and the main drill rod 1, and the solidified material is sprayed according to the design requirements;

[0060] Step 5: Dynamic adjustment of drilling and mixing construction;

[0061] When the torque of the main drill pipe 1 is less than or equal to 50% of the rated torque, the strong electromagnetic device 65 is started, and the expansion blade 64 and the main drill pipe 1 are relatively fixed and rotate synchronously through strong electromagnetic suction;

[0062] When the torque of the main drill pipe 1 is between 50% and 100% of the rated torque, the original state is maintained unchanged;

[0063] When the torque of the main drill pipe 1 is greater than or equal to 100% of the rated torque, the strong electromagnetic device 65 is turned off, so that the expansion blade 64 and the main drill pipe 1 do not rotate synchronously;

[0064] Step 6: When the high-speed deep mixing drill bit mixes upward to the set depth, the mixing construction operation is completed.

[0065] Preferably, during the dynamic adjustment of the drilling and mixing construction in step 3, the following conditions are met at the same time:

[0066] When the stirring drilling speed is greater than or equal to the set drilling speed, the driving cylinder 11 is kept pulling the leading drill rod 12 backward to a fully retracted state;

[0067] When the stirring drilling speed is greater than or equal to 80% of the set drilling speed and less than the set drilling speed, the driving cylinder 11 is kept pulling the leading drill rod 12 backward to a fully retracted state;

[0068] When the stirring drilling speed is greater than 50% of the set drilling speed and less than 80% of the set drilling speed, the driving cylinder 11 pushes the leading drill rod 12 forward to extend to 50% of the maximum length;

[0069] When the stirring drilling speed is less than 80% of the set drilling speed, the driving cylinder 11 is kept pulling the leading drill rod 12, and the driving cylinder 11 pushes the leading drill rod 12 to extend forward to the maximum length.

[0070] The present invention relates to a high-speed deep-layer mixing drill bit and a method for using the same. An advance drill rod is provided and a driving guide rod is installed on the advance drill rod to drive the extension and retraction of a first-level mixing blade, so that advance construction is carried out when drilling at the deepest depth. The stirring diameter during the advance construction is small, and the problem of supporting the drill is successfully solved after the stirring of the remixing blades. A body expander is provided and a strong electromagnetic device is applied to the drill bit to realize an electric-driven hole expansion scheme, and the location and length of the hole expansion can be precisely controlled. A guide ring is installed on the second-level remixing blade, so that the drill bit is not prone to tilting when encountering a soft and hard intersecting soil layer.

[0071] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention also fall within the protection scope of the present invention.

Claims

1. A high-speed deep mixing drill bit, characterized in that: It includes a main drill rod, a first-level stirring blade, a second-level compound stirring blade, a third-level compound stirring blade, a fourth-level compound stirring blade, an expander, a guide ring, a drill tip, a drill tooth, a driving guide rod, a driving cylinder, and an advance drill rod; the expander includes a positioning sleeve, a wear-resistant sleeve, a connecting key, a body expander blade, and a strong electromagnetic device; the first-level stirring blade is connected to the advance drill rod in an articulated form; the first-level stirring blade and the driving guide rod, and the driving guide rod and the advance drill rod are connected by welding; the drill tip and the advance drill rod are connected by welding; the second-level compound stirring blade, the third-level compound stirring blade, the fourth-level compound stirring blade and the main drill rod are all connected by welding; the first-level stirring blade and the second-level compound stirring blade are both welded with drill teeth, and the guide ring is connected to the second-level compound stirring blade by welding, An expander is installed between the secondary remixing blade and the tertiary remixing blade, and between the tertiary remixing blade and the quaternary remixing blade. The positioning sleeve is connected to the drill rod by welding, the positioning sleeve is connected to the wear-resistant sleeve by a slide groove, the wear-resistant sleeve is connected to the connecting key by welding, and the connecting key is connected to the expander blade by a bolt; the advance drill rod is arranged inside the main drill rod, the advance drill rod and the main drill rod are connected by a bearing, and the advance drill rod and the main drill rod are respectively connected to two independent power heads of the drilling rig; the positioning sleeve, wear-resistant sleeve, connecting key, expander blade, and advance drill rod are all made of magnetic materials, and torque sensors are arranged on the top of the advance drill rod and the main drill rod; the length of the expander is not less than the length of the secondary remixing blade, the tertiary remixing blade, and the quaternary remixing blade; The driving guide rod is driven by hydraulic oil. After the positive pressure is applied, the driving guide rod pushes the first-stage stirring blade to expand outside the leading drill rod. After the reverse pressure is applied, the driving guide rod drives the first-stage stirring blade to shrink inside the leading drill rod. The angle between the first-stage stirring blade and the leading drill rod varies in the range of 5°-90°. The driving oil cylinder is arranged on the upper part of the driving guide rod and is welded to the driving guide rod. The driving oil cylinder is driven by hydraulic oil. After applying forward pressure, the driving oil cylinder pushes the leading drill rod to extend forward by a set length. After applying backward pressure, the driving oil cylinder pulls the leading drill rod to retract backward by a set length. The maximum length of the leading drill rod extending forward and retracting backward is 1.0 times the length of the leading drill rod. The strong electromagnetic device is fixed to the inner wall of the main drill pipe and is located at the same horizontal height as the expander. The strong electromagnetic device is an electromagnetic strong magnet. When powered on, the electromagnetic strong magnet has high magnetism and can absorb surrounding magnetic materials. After power is off, the electromagnetic strong magnet has no magnetism.

2. A high-speed deep mixing drill bit according to claim 1, characterized in that: The diameter of the advance drill rod is smaller than the diameter of the main drill rod, the diameter of the advance drill rod is 10cm-20cm, and the length of the advance drill rod is 1m-3m.

3. A high-speed deep mixing drill bit according to claim 1, characterized in that: The wear-resistant sleeve is a hollow cylindrical structure. Solid lubricant is applied to the position of the wear-resistant sleeve before drilling. When the maximum wear of the wear-resistant sleeve exceeds 2 mm, it should be replaced in time.

4. A high-speed deep mixing drill bit according to claim 1, characterized in that: The guide ring is a circular ring structure, the radius of the guide ring is equal to the length of the secondary compound stirring blade, the width of the guide ring is 10cm~20cm, and the thickness of the guide ring is 5mm~10mm.

5. A high-speed deep mixing drill bit according to claim 1, characterized in that: The primary stirring blades are composed of three stirring blades, and the angle between the projections of two adjacent stirring blades on the horizontal plane is 120°.

6. A method for using a high-speed deep mixing drill, characterized in that: According to the high-speed deep mixing drill bit of claim 1, the following steps are used for construction: Step 1: Install and debug the drill bit; Prepare the high-speed deep mixing drill bit, start the power system, test run the high-speed deep mixing drill bit for 5-10 minutes, test the reliability of the torque sensor, strong electromagnetic device, and expander, move the high-speed deep mixing drill bit to the set position, adjust the angle between the first-level mixing blade and the lead drill rod to 30°-60°, and keep the drive cylinder pulling the lead drill rod backward to a fully retracted state; Step 2: Start drilling and stirring; At the same time, the main drill rod and the advance drill rod are driven to rotate forward and move vertically downward, and the construction is carried out according to the designed rotation speed, the designed main drill rod rotation driving force, and the designed advance drill rod rotation driving force. The main drill rod and the advance drill rod maintain the same rotation speed, and the strong electromagnetic device is turned off so that the expansion blade and the main drill rod do not rotate synchronously. At the same time, the torque of the advance drill rod and the main drill rod is monitored by a torque sensor, and the solidified material is sprayed according to the design requirements; Step 3: Dynamic adjustment of drilling and mixing construction; When the torque of the lead drill pipe is less than or equal to 50% of the rated torque, the angle between the first-stage stirring blade and the lead drill pipe is maintained at 30°-60°, the speed of the lead drill pipe remains unchanged at the original design speed, and the rotational driving force of the lead drill pipe remains unchanged at the original design rotational driving force; When the torque of the lead drill pipe is greater than 50% of the rated torque and less than 80% of the rated torque, the guide rod is driven to drive the first-stage stirring blade to retract into the lead drill pipe after the reverse pressure is fed, so that the angle between the first-stage stirring blade and the lead drill pipe is maintained at 20°-30°, the speed of the lead drill pipe is reduced to 70%-90% of the design speed, and the rotational driving force of the lead drill pipe is increased to 120%-150% of the design rotational driving force; When the torque of the lead drill pipe is greater than or equal to 80% of the rated torque, the guide rod is driven to drive the first-stage stirring blade to retract into the lead drill pipe after the reverse pressure is fed, and the angle between the first-stage stirring blade and the lead drill pipe is maintained at 5°-20°, reducing the speed of the lead drill pipe to 40%-70% of the design speed, and increasing the rotational driving force of the lead drill pipe to 150%-200% of the design rotational driving force; Step 4: Start to stir with the drill; When the high-speed deep mixing drill bit mixes downward to the set depth, the angle between the first-stage mixing blade and the advance drill pipe is adjusted to 30°-60°, and the driving cylinder is adjusted to pull the advance drill pipe backward to a fully retracted state, and at the same time, the main drill pipe and the advance drill pipe are driven to rotate in the opposite direction and move vertically upward. The construction is carried out according to the designed rotation speed, the designed main drill pipe rotation driving force, and the designed advance drill pipe rotation driving force. The main drill pipe and the advance drill pipe maintain the same rotation speed, and the strong electromagnetic device is turned off so that the expansion blade and the main drill pipe do not rotate synchronously. At the same time, the torque sensor is used to monitor the torque of the advance drill pipe and the main drill pipe, and the solidified material is sprayed according to the design requirements; Step 5: Dynamic adjustment of drilling and mixing construction; When the torque of the main drill pipe is less than or equal to 50% of the rated torque, the strong electromagnetic device is started, and the expansion blade and the main drill pipe are relatively fixed and rotate synchronously through strong electromagnetic suction; When the torque of the main drill pipe is between 50% and 100% of the rated torque, the original state remains unchanged; When the torque of the main drill pipe is greater than or equal to 100% of the rated torque, the strong electromagnetic device is turned off so that the expansion blades and the main drill pipe do not rotate synchronously; Step 6: When the high-speed deep mixing drill bit mixes upward to the set depth, the mixing construction operation is completed.

7. The method for using a high-speed deep mixing drill according to claim 6, characterized in that: When the drilling and mixing construction is dynamically adjusted in step 3, the following conditions are met at the same time: When the stirring drilling speed is greater than or equal to the set drilling speed, the driving cylinder is kept pulling the leading drill rod backward to a fully retracted state; When the stirring drilling speed is greater than or equal to 80% of the set drilling speed and less than the set drilling speed, keep the driving cylinder pulling the leading drill rod backward to a fully retracted state; When the stirring drilling speed is greater than 50% of the set drilling speed and less than 80% of the set drilling speed, the driving cylinder pushes the leading drill rod forward to extend to 50% of the maximum length; When the stirring drilling speed is less than 80% of the set drilling speed, the driving cylinder is kept pulling the advance drill rod, and the driving cylinder pushes the advance drill rod forward to extend to the maximum length.

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