High-speed mixing drilling rig and construction method thereof

Abstract

The invention discloses a high-speed mixing drilling rig and a construction method thereof, which belongs to the technical field of pile foundation construction, and includes a pile frame, a chassis, a vertical rotary power system, a circumferential rotary power system, a rotary drive, a rotary pressure plate, a drill rod, a drill bit, a chain, a solidified material pumping system, and a high-pressure gas supply system; the pile frame and the chassis are connected by bolts, the vertical rotary power system and the circumferential rotary power system are both installed on the chassis, the rotary drive 3 is connected to the pile frame by a guide rail, the rotary pressure plate is connected to the vertical rotary power system by a chain, the rotary pressure plate is connected to the drill rod by a flange, the drill rod is connected to the drill bit by a flange, and the solidified material pumping system and the high-pressure gas supply system are both connected to the drill rod by a high-pressure hose. The invention reduces the center of gravity of the drilling rig by placing the power head downward, prevents the drilling rig from tilting forward during the construction process, achieves the functions of drilling down and lifting the drill by only setting one power head, reduces the construction process, improves the construction efficiency, and saves the cost.

Description

Technical Field

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

[0002] The construction of high-rise buildings, railways or bridges requires piling, and pile holes need to be drilled for piling. Depending on the geology, pile poles are poured into the holes after drilling, which are called cast-in-place piles, or cement slurry is sprayed into the holes while drilling, and the pile poles are cast in place, which are called mixing piles. Whether it is a cast-in-place pile or a mixing pile, an engineering drill will be used. The core component of the engineering drill is the power head. The main function of the power head is to transmit the torque and speed generated by the power component to the drill tool, so as to achieve continuous drilling and crushing of rocks and gravel by the drill tool. With the vigorous development of the construction industry, the use of engineering drills has become more and more widespread, and higher requirements have been placed on the power head that provides power to the drill tool.

[0003] At present, conventional power heads on the market have complex equipment structures, large volumes, low power, low working efficiency, and inconvenient transportation. In addition, the power head is generally installed on the top of the drilling rig, and gradually lowers with the penetration of the drill rod. The power head is heavy, causing the center of gravity of the drilling rig to tilt forward and move upward, resulting in greater danger during the construction of the drilling rig. In addition, there is also a method of dividing the power head into two parts, one part is responsible for the downward pressure and lifting force at the upper part, and the other part is responsible for providing torque at the lower part, but this structure is relatively complex, the construction process is cumbersome, and the equipment loss is serious. Therefore, in order to solve the above problems, the present invention proposes a high-speed mixing drilling rig and a construction method thereof. Summary of the invention

[0004] In view of the above technical problems existing in the prior art, the present invention proposes a high-speed mixing drilling rig and a construction method thereof, which overcomes the shortcomings of the prior art. By placing the power head downward, the center of gravity of the drilling rig is lowered, and the drilling rig is prevented from tilting forward during the construction process. By setting only one power head to achieve the functions of drilling down and lifting the drill, the construction process is reduced, the construction efficiency is improved, and the cost is saved.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A high-speed mixing drilling rig, characterized in that it includes a pile frame, a chassis, a vertical rotary power system, a circumferential rotary power system, a rotary drive, a rotary pressure plate, a drill rod, a drill bit, a chain, a solidified material pumping system, a high-pressure gas supply system, and a control system; the rotary drive includes a guide rail, a bracket, a hydraulic motor, a clamping cylinder, a connector, a limit rod, a block, a rotary sleeve, an upper rotary bearing, a lower rotary bearing, and a gear; the pile frame and the chassis are connected by bolts, the vertical rotary power system and the circumferential rotary power system are both installed on the chassis, the rotary drive is connected to the pile frame through a guide rail, the rotary pressure plate is connected to the vertical rotary power system through a chain, and the rotary pressure plate is connected to the vertical rotary power system through a flange The drill pipe is connected, and the drill pipe and the flange are connected by pin connection. The solidifying material pumping system and the high-pressure gas supply system are connected to the drill pipe through high-pressure hoses; the guide rail is connected to the bracket by bolts, the hydraulic motor is connected to the bracket by bolts, the clamping cylinder and the limit rod are connected to the bracket by bolts, the connector is fixed by the limit rod, the clamping cylinder and the connector are fixed by bolts, an upper slewing bearing is installed in the connector, the block is connected to the upper slewing bearing by bolts, the slewing sleeve is connected to the gear by bolts, the gear is connected to the outer ring of the lower slewing bearing by bolts, and the inner ring of the lower slewing bearing is connected to the bracket by bolts.

[0007] Preferably, the connector is a polygonal structure, six holes are evenly reserved on the connector, the angle between adjacent holes is 60°, the clamping cylinder and the limit rod are staggered in the six holes, and the outer ring of the upper slewing bearing is connected to the connector.

[0008] Preferably, the clamping block is made of steel, and is divided into a wedge block and a support rod. The wedge block and the support rod are hingedly connected, one end of the support rod is connected to the inner ring of the upper slewing bearing, and the wedge block moves in the drill pipe and the rotary casing.

[0009] Preferably, the clamping cylinder is a hydraulic cylinder, and the stroke of the clamping cylinder is smaller than the length of the wedge block.

[0010] Preferably, the end of the limiting rod connected to the bracket is thicker, and the end away from the bracket is thinner, and the diameter of the thinner end is smaller than the diameter of the reserved hole on the connector.

[0011] Preferably, the drill rod includes an initial drill rod and an external drill rod. When no additional drill rod is needed, the drill rod is only the initial drill rod. When an additional drill rod is needed, the drill rod is a combination of the initial drill rod and the external drill rod. The initial drill rod and the external drill rod have the same diameter, and the drill rods are connected by pins.

[0012] A construction method of a high-speed mixing drill, characterized in that a high-speed mixing drill is used for construction, and the specific construction steps are as follows:

[0013] Step 1: Start the drilling rig, put it in place according to the design requirements, adjust the pile frame and chassis, ensure that the drilling rig is in a horizontal state and the drill rod is in a vertical state, and test run the drilling rig for 5-10 minutes;

[0014] Step 2: Release the locking device of the slewing drive and the initial drill pipe, unload the pressure of the hydraulic cylinder in the slewing drive, start the vertical slewing power system to lift the slewing drive upward to the top of the drill pipe;

[0015] Step 3: Start the hydraulic cylinder of the rotary drive and push forward to increase pressure, so that a squeezing force is generated between the wedge-shaped pressure module and the drill pipe to ensure that there is no considerable slippage between the two, and start the locking device of the rotary drive and the drill pipe;

[0016] Step 4: Start the annular rotary power system, drive the rotary casing to rotate forward through the hydraulic motor, and then drive the initial drill rod and drill bit to rotate forward, start the vertical rotary power system, so that the rotary drive moves downward, and then drive the initial drill rod and drill bit to move downward, and at the same time start the solidification material pumping system and the high-pressure gas supply system to mix the solidification material into the soil through the drill bit;

[0017] Step 5: When the rotary drive drives the initial drill rod to move downward to the bottom of the pile frame, turn off the circumferential rotary power system, the vertical rotary power system, the solidifying material pumping system, and the high-pressure gas supply system, release the locking device between the rotary pressure plate and the initial drill rod, lift the rotary pressure plate upward to the set height, and repeat step 4 and the above process of this step until the top of the initial drill rod is 3-5m away from the ground;

[0018] Step 6: If it is necessary to add an external drill rod, turn off the annular rotary power system, the vertical rotary power system, the solidified material pumping system, and the high-pressure gas supply system, release the locking device between the rotary pressure plate and the initial drill rod, lift the rotary pressure plate upward to the set height, connect the upper and lower parts of the external drill rod to the rotary pressure plate and the initial drill rod respectively, and lock them. Similarly, repeat steps 2 to 4 and the above process of this step until all external drill rods are added. When all external drill rods are added or no external drill rods are needed, continue to drive the initial drill rod, drill bit or external drill rod to rotate and move downward through the rotary drive until stirring reaches the set depth;

[0019] Step 7: Adjust the circumferential rotary power system and the vertical rotary power system to make the rotary casing rotate in the opposite direction, so that the rotary drive drives the initial drill pipe, the drill bit or the external drill pipe to move upward and rotate in the opposite direction, and the curing agent mixing system and the high-pressure gas supply system continue to pump the curing agent and high-pressure gas into the soil through the drill bit;

[0020] Step 8: If an external drill rod has been added, when the lower end of the first section of the external drill rod is lifted to a height of 0.5-2.0m above the ground, turn off the circumferential rotary power system, the vertical rotary power system, the solidified material pumping system, and the high-pressure gas supply system, release the locking device between the rotary drive and the first section of the external drill rod, unload the pressure of the hydraulic cylinder in the rotary drive, move the rotary drive downward to the upper part of the next section of the drill rod, and use step 3 to make the next section of the drill rod relatively fixed by the rotary drive, release the connection between the first section of the external drill rod, the rotary pressure plate, and the next section of the drill rod, remove the drill rod, and then move the rotary pressure plate downward to the next section of the drill rod. After connection and locking, open the circumferential rotary power system and the vertical rotary power system to make the rotary casing rotate in the opposite direction, so that the rotary drive drives the initial drill rod, the drill bit or the external drill rod to move upward and rotate in the opposite direction, and at the same time open the solidifying material pumping system and the high-pressure gas supply system, and repeat the above process of this step when removing the next section of the external drill rod until all the external drill rods are removed, so that the initial drill rod and the drill bit are retained on the pile frame or no external drill rod is added, and the initial drill rod and the drill bit are continuously lifted, and finally, after the drill bit is completely separated from the soil, close the circumferential rotary power system, the vertical rotary power system, the solidifying material pumping system, and the high-pressure gas supply system;

[0021] Step 9: Level the site near the mixing pile and move the drilling rig to construct the next mixing pile;

[0022] Step 10: Repeat steps 1 to 8 until the construction is completed.

[0023] Preferably, the extrusion pressure generated between the wedge-shaped pressurizing module and the drill pipe is in the range of 100 kN-2000 kN.

[0024] Preferably, when the rotary drive is fixedly locked and moved synchronously with the initial drill rod or the external drill rod, the speed range of the rotary drive moving upward and downward is 0.2-2.0 m / min, and the rotary drive moving upward speed is not less than its downward speed.

[0025] Preferably, the high-pressure gas pressure provided by the high-pressure gas supply system is in the range of 0.2-2.0 MPa, and the pressure of the high-pressure gas increases with the increase of stirring depth and stirring resistance.

[0026] Beneficial technical effects brought by the present invention:

[0027] By placing the power head downward, the center of gravity of the drilling rig is lowered, preventing the drilling rig from tilting forward during construction. By setting up only one power head to achieve the functions of drilling and lifting the drill, the construction process is reduced, the construction efficiency is improved, and the cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention is a structural schematic diagram of a high-speed mixing drilling rig and a drilling rig in a construction method thereof.

[0029] Figure 2 The present invention is a schematic diagram of the structural cross-section of a high-speed mixing drill and a rotary drive in a construction method thereof.

[0030] Figure 3 The present invention provides a high-speed mixing drill and a top view of the rotary drive in the construction method thereof.

[0031] Among them, 1-pile frame, 2-chassis, 3-rotary drive, 4-rotary pressure plate, 5-drill rod, 6-drill bit, 7-chain, 31-guide rail, 32-bracket, 33-hydraulic motor, 34-clamping cylinder, 35-connector, 36-limit rod, 37-block, 38-rotary casing, 39-upper slewing bearing, 310-lower slewing bearing, 311-gear. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0033] like Figures 1 to 3 As shown, a high-speed mixing drilling rig is characterized in that it includes a pile frame 1, a chassis 2, a vertical rotary power system, a circumferential rotary power system, a rotary drive 3, a rotary pressure plate 4, a drill rod 5, a drill bit 6, a chain 7, a solidified material pumping system, a high-pressure gas supply system, and a control system; the rotary drive 3 includes a guide rail 31, a bracket 32, a hydraulic motor 33, a clamping cylinder 34, a connector 35, a limit rod 36, a block 37, a rotary sleeve 38, an upper rotary bearing 39, a lower rotary bearing 310, and a gear 311; the pile frame 1 and the chassis 2 are connected by bolts, the vertical rotary power system and the circumferential rotary power system are both installed on the chassis 2, the rotary drive 3 is connected to the pile frame 1 through the guide rail 31, the rotary pressure plate 4 is connected to the vertical rotary power system through the chain 7, and the rotary pressure plate 4 is connected to the vertical rotary power system through the flange The guide rail 31 is connected to the bracket 32 ​​by bolts, the hydraulic motor 33 is connected to the bracket 32 ​​by bolts, the clamping cylinder 34 and the limit rod 36 are connected to the bracket 32 ​​by bolts, the connector 35 is fixed by the limit rod 36, the clamping cylinder 34 and the connector 35 are fixed by bolts, an upper slewing bearing 39 is installed in the connector 35, the block 37 is connected to the upper slewing bearing 39 by bolts, the slewing sleeve 38 is connected to the gear 311 by bolts, the gear 311 is connected to the outer ring of the lower slewing bearing 310 by bolts, and the inner ring of the lower slewing bearing 310 is connected to the bracket 32 ​​by bolts.

[0034] Preferably, the connector 35 is a polygonal structure, six holes are evenly reserved on the connector 35, the angle between adjacent holes is 60°, the clamping cylinder 34 and the limit rod 36 are staggered in the six holes, and the outer ring of the upper slewing bearing 39 is connected to the connector 35.

[0035] Preferably, the clamping block 37 is made of steel, and is divided into a wedge block and a support rod. The wedge block and the support rod are hingedly connected, one end of the support rod is connected to the inner ring of the upper slewing bearing 39, and the wedge block moves in the drill pipe 5 and the slewing casing 38.

[0036] Preferably, the clamping cylinder 34 is a hydraulic cylinder, and the stroke of the clamping cylinder 34 is smaller than the length of the wedge block.

[0037] Preferably, the end of the limiting rod 36 connected to the bracket 32 ​​is thicker, and the end away from the bracket 32 ​​is thinner, and the diameter of the thinner end is smaller than the diameter of the reserved hole on the connector 35.

[0038] Preferably, the drill rod 5 includes an initial drill rod and an external drill rod. When there is no need to add a drill rod 5, the drill rod 5 is only the initial drill rod. When there is a need to add a drill rod 5, the drill rod 5 is a combination of the initial drill rod and the external drill rod. The initial drill rod and the external drill rod have the same diameter, and the drill rods 5 are connected by pin connection.

[0039] A construction method of a high-speed mixing drill, characterized in that a high-speed mixing drill is used for construction, and the specific construction steps are as follows:

[0040] Step 1: Start the drilling rig, put it in place according to the design requirements, adjust the pile frame 1 and the chassis 2, ensure that the drilling rig is in a horizontal state and the drill rod 5 is in a vertical state, and test run the drilling rig for 5-10 minutes;

[0041] Step 2: Release the locking device between the slewing drive 3 and the initial drill rod, unload the pressure of the hydraulic cylinder in the slewing drive 3, and start the vertical slewing power system to lift the slewing drive 3 upward to the top of the drill rod 5;

[0042] Step 3: Start the hydraulic cylinder of the rotary drive 3 and push forward to increase pressure, so that a squeezing force is generated between the wedge-shaped pressurizing module and the drill rod 5 to ensure that there is no considerable sliding between the two, and start the locking device of the rotary drive 3 and the drill rod 5;

[0043] Step 4: Start the annular rotary power system, drive the rotary casing 38 to rotate forward through the hydraulic motor 33, and then drive the initial drill rod and drill bit 6 to rotate forward, start the vertical rotary power system, so that the rotary drive 3 moves downward, and then drive the initial drill rod and drill bit 6 to move downward, and at the same time start the solidifying material pumping system and the high-pressure gas supply system to mix the solidifying material into the soil through the drill bit 6;

[0044] Step 5: When the rotary drive 3 drives the initial drill rod to move downward to the bottom of the pile frame 1, the circumferential rotary power system, the vertical rotary power system, the solidified material pumping system, and the high-pressure gas supply system are turned off, and the locking device between the rotary pressure plate 4 and the initial drill rod is released. After the rotary pressure plate 4 is lifted upward to the set height, step 4 and the above process of this step are repeated until the top of the initial drill rod is 3-5m away from the ground;

[0045] Step 6: If it is necessary to add an external drill rod, turn off the annular rotary power system, the vertical rotary power system, the solidified material pumping system, and the high-pressure gas supply system, release the locking device between the rotary pressure plate 4 and the initial drill rod, lift the rotary pressure plate 4 to the set height, connect the upper and lower parts of the external drill rod to the rotary pressure plate 4 and the initial drill rod respectively, and lock them. Similarly, repeat steps 2 to 4 and the above process of this step until all external drill rods are added. When all external drill rods are added or no external drill rods are needed, continue to drive the initial drill rod, the drill bit 6 or the external drill rod to rotate and move downward through the rotary drive 3 until the mixing reaches the set depth;

[0046] Step 7: Adjust the annular rotary power system and the vertical rotary power system to make the rotary casing 38 rotate in the opposite direction, so that the rotary drive 3 drives the initial drill pipe, the drill bit 6 or the external drill pipe to move upward and rotate in the opposite direction, and the curing agent mixing system and the high-pressure gas supply system continue to pump the curing agent and the high-pressure gas into the soil through the drill bit 6;

[0047] Step 8: If an external drill rod has been added, when the lower end of the first section of the external drill rod is lifted to a height of 0.5-2.0m above the ground, turn off the circumferential rotary power system, the vertical rotary power system, the solidified material pumping system, and the high-pressure gas supply system, release the locking device between the rotary drive 3 and the first section of the external drill rod, unload the pressure of the hydraulic cylinder in the rotary drive 3, move the rotary drive 3 downward to the top of the next section of the drill rod 5, and then use step 3 to make the next section of the drill rod 5 of the rotary drive 3 relatively fixed, release the connection between the first section of the external drill rod and the rotary pressure plate 4 and the next section of the drill rod 5, remove the drill rod 5, and then move the rotary pressure plate 4 downward to the next section of the drill rod. After the rod 5 is connected and locked, the annular rotary power system and the vertical rotary power system are opened to make the rotary casing 38 rotate in the opposite direction, so that the rotary drive 3 drives the initial drill rod, the drill bit 6 or the external drill rod to move upward and rotate in the opposite direction, and at the same time, the solidifying material pumping system and the high-pressure gas supply system are opened, and the above process of this step is repeated similarly when the next section of the external drill rod is removed, until all the external drill rods are removed, so that the initial drill rod and the drill bit 6 are retained on the pile frame 1 or no external drill rod is added, the initial drill rod and the drill bit 6 are continuously lifted, and finally, after the drill bit 6 is completely separated from the soil, the annular rotary power system, the vertical rotary power system, the solidifying material pumping system, and the high-pressure gas supply system are closed;

[0048] Step 9: Level the site near the mixing pile and move the drilling rig to construct the next mixing pile;

[0049] Step 10: Repeat steps 1 to 8 until the construction is completed.

[0050] Preferably, the extrusion pressure generated between the wedge-shaped pressurizing module and the drill rod 5 is in the range of 100 kN-2000 kN.

[0051] Preferably, when the rotary drive 3 is fixedly locked and moved synchronously with the initial drill rod or the external drill rod, the speed range of the rotary drive 3 moving upward and downward is 0.2-2.0 m / min, and the upward moving speed of the rotary drive 3 is not less than its downward moving speed.

[0052] Preferably, the high-pressure gas pressure provided by the high-pressure gas supply system is in the range of 0.2-2.0 MPa, and the pressure of the high-pressure gas increases with the increase of stirring depth and stirring resistance.

[0053] The present invention discloses a high-speed mixing drill and a construction method thereof. By placing a power head downward, the center of gravity of the drill is lowered to prevent the drill from tilting forward during the construction process. Only one power head is provided to achieve the functions of drilling down and lifting the drill, thereby reducing the construction procedures, improving the construction efficiency and saving the cost.

[0054] 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 mixing drill, characterized in that: It includes a pile frame, a chassis, a vertical rotary power system, a circumferential rotary power system, a rotary drive, a rotary pressure plate, a drill pipe, a drill bit, a chain, a solidified material pumping system, a high-pressure gas supply system, and a control system; the rotary drive includes a guide rail, a bracket, a hydraulic motor, a clamping cylinder, a connector, a limit rod, a block, a rotary casing, an upper rotary bearing, a lower rotary bearing, and a gear; the pile frame and the chassis are connected by bolts, the vertical rotary power system and the circumferential rotary power system are both installed on the chassis, the rotary drive is connected to the pile frame through a guide rail, the rotary pressure plate is connected to the vertical rotary power system through a chain, the rotary pressure plate is connected to the drill pipe through a flange, and the drill The rod and the flange are connected by pin connection, and the solidifying material pumping system and the high-pressure gas supply system are connected to the drill rod through a high-pressure hose; the guide rail is connected to the bracket by bolts, the hydraulic motor is connected to the bracket by bolts, the clamping cylinder and the limit rod are connected to the bracket by bolts, the connector is fixed by the limit rod, the clamping cylinder and the connector are fixed by bolts, an upper slewing bearing is installed in the connector, the block is connected to the upper slewing bearing by bolts, the slewing sleeve is connected to the gear by bolts, the gear is connected to the outer ring of the lower slewing bearing by bolts, and the inner ring of the lower slewing bearing is connected to the bracket by bolts.

2. A high-speed mixing drill according to claim 1, characterized in that: The connector is a polygonal structure, with six holes evenly reserved on the connector, the angle between adjacent holes is 60°, the clamping cylinder and the limit rod are staggered in the six holes, and the outer ring of the upper slewing bearing is connected to the connector.

3. A high-speed mixing drill according to claim 1, characterized in that: The clamping block is made of steel and is divided into a wedge block and a support rod. The wedge block and the support rod are hingedly connected. One end of the support rod is connected to the inner ring of the upper slewing bearing. The wedge block moves in the drill pipe and the slewing casing.

4. A high-speed mixing drill according to claim 1, characterized in that: The clamping cylinder is a hydraulic cylinder, and the stroke of the clamping cylinder is smaller than the length of the wedge block.

5. A high-speed mixing drill according to claim 1, characterized in that: The end of the limiting rod connected to the bracket is thicker, and the end away from the bracket is thinner, and the diameter of the thinner end is smaller than the diameter of the reserved hole on the connector.

6. A high-speed mixing drill according to claim 1, characterized in that: The drill rod includes an initial drill rod and an external drill rod. When no additional drill rod is needed, the drill rod is only the initial drill rod. When an additional drill rod is needed, the drill rod is a combination of the initial drill rod and the external drill rod. The initial drill rod and the external drill rod have the same diameter, and the drill rods are connected by pins.

7. A construction method of a high-speed mixing drilling rig, characterized in that: The high-speed mixing drilling rig described in claim 1 is used for construction, and the specific construction steps are as follows: Step 1: Start the drilling rig, put it in place according to the design requirements, adjust the pile frame and chassis, ensure that the drilling rig is in a horizontal state and the drill rod is in a vertical state, and test run the drilling rig for 5-10 minutes; Step 2: Release the locking device of the slewing drive and the initial drill pipe, unload the pressure of the hydraulic cylinder in the slewing drive, start the vertical slewing power system to lift the slewing drive upward to the top of the drill pipe; Step 3: Start the hydraulic cylinder of the rotary drive and push forward to increase pressure, so that a squeezing force is generated between the wedge-shaped pressure module and the drill pipe to ensure that there is no considerable slippage between the two, and start the locking device of the rotary drive and the drill pipe; Step 4: Start the annular rotary power system, drive the rotary casing to rotate forward through the hydraulic motor, and then drive the initial drill rod and drill bit to rotate forward, start the vertical rotary power system, so that the rotary drive moves downward, and then drive the initial drill rod and drill bit to move downward, and at the same time start the solidification material pumping system and the high-pressure gas supply system to mix the solidification material into the soil through the drill bit; Step 5: When the rotary drive drives the initial drill rod to move downward to the bottom of the pile frame, turn off the circumferential rotary power system, the vertical rotary power system, the solidifying material pumping system, and the high-pressure gas supply system, release the locking device between the rotary pressure plate and the initial drill rod, lift the rotary pressure plate upward to the set height, and repeat step 4 and the above process of this step until the top of the initial drill rod is 3-5m away from the ground; Step 6: If it is necessary to add an external drill rod, turn off the annular rotary power system, the vertical rotary power system, the solidified material pumping system, and the high-pressure gas supply system, release the locking device between the rotary pressure plate and the initial drill rod, lift the rotary pressure plate upward to the set height, connect the upper and lower parts of the external drill rod to the rotary pressure plate and the initial drill rod respectively, and lock them. Similarly, repeat steps 2 to 4 and the above process of this step until all external drill rods are added. When all external drill rods are added or no external drill rods are needed, continue to drive the initial drill rod, drill bit or external drill rod to rotate and move downward through the rotary drive until stirring reaches the set depth; Step 7: Adjust the circumferential rotary power system and the vertical rotary power system to make the rotary casing rotate in the opposite direction, so that the rotary drive drives the initial drill pipe, the drill bit or the external drill pipe to move upward and rotate in the opposite direction, and the curing agent mixing system and the high-pressure gas supply system continue to pump the curing agent and high-pressure gas into the soil through the drill bit; Step 8: If an external drill rod has been added, when the lower end of the first section of the external drill rod is lifted to a height of 0.5-2.0m above the ground, turn off the circumferential rotary power system, the vertical rotary power system, the solidified material pumping system, and the high-pressure gas supply system, release the locking device between the rotary drive and the first section of the external drill rod, unload the pressure of the hydraulic cylinder in the rotary drive, move the rotary drive downward to the upper part of the next section of the drill rod, and use step 3 to make the next section of the drill rod relatively fixed by the rotary drive, release the connection between the first section of the external drill rod, the rotary pressure plate, and the next section of the drill rod, remove the drill rod, and then move the rotary pressure plate downward to the next section of the drill rod. After connection and locking, open the circumferential rotary power system and the vertical rotary power system to make the rotary casing rotate in the opposite direction, so that the rotary drive drives the initial drill rod, the drill bit or the external drill rod to move upward and rotate in the opposite direction, and at the same time open the solidifying material pumping system and the high-pressure gas supply system, and repeat the above process of this step when removing the next section of the external drill rod until all the external drill rods are removed, so that the initial drill rod and the drill bit are retained on the pile frame or no external drill rod is added, and the initial drill rod and the drill bit are continuously lifted, and finally, after the drill bit is completely separated from the soil, close the circumferential rotary power system, the vertical rotary power system, the solidifying material pumping system, and the high-pressure gas supply system; Step 9: Level the site near the mixing pile and move the drilling rig to construct the next mixing pile; Step 10: Repeat steps 1 to 8 until the construction is completed.

8. According to the construction method of a high-speed mixing drilling rig according to claim 7, the extrusion pressure generated between the wedge-shaped pressure module and the drill rod ranges from 100kN to 2000kN.

9. According to the construction method of a high-speed mixing drilling rig described in claim 7, when the rotary drive is fixedly locked and moved synchronously with the initial drill rod or the external drill rod, the speed range of the rotary drive moving upward and downward is 0.2-2.0m / min, and the upward moving speed of the rotary drive is not less than its downward moving speed.

10. According to the construction method of a high-speed mixing drilling rig as described in claim 7, the high-pressure gas pressure range provided by the high-pressure gas supply system is 0.2-2.0MPa, and the pressure of the high-pressure gas increases with the increase of mixing depth and mixing resistance.

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