Bored pile hole cleaning aid and method

Abstract

The application discloses a cast-in-situ bored pile auxiliary hole cleaning equipment and method, relates to the technical field of cast-in-situ bored pile auxiliary hole cleaning, and aims at solving the problem of the hole cleaning device in the prior art that utilizes the rotation of the stirring paddle to gradually drive the mortar upwards and remove it, but the mortar may fall during the lifting process, thereby affecting the hole cleaning quality. The inside of the ground is provided with a drill hole, the top of one side of the drill hole is provided with a mud circulating groove, and one side of the mud circulating groove is provided with a sedimentation tank. Further, the drill hole is provided with a drill rod, the bottom of the drill rod is provided with a drill bucket, the bottom of the drill bucket is provided with a drill bit, the drill bit is provided with a plurality of drill bits, a spiral conveying rod is arranged in the inside of the drill bucket, a plurality of spiral leaves are arranged on the spiral conveying rod, a mortar separation cylinder is arranged on the top of the sedimentation tank, the bottom of the mortar separation cylinder is provided with a residue discharge port, and the top of the mortar separation cylinder is provided with an overflow port.

Description

Technical Field

[0001] The invention relates to the technical field of bored cast-in-place pile auxiliary hole cleaning, in particular to bored cast-in-place pile auxiliary hole cleaning equipment and method. Background Art

[0002] Hole cleaning is an important step in bored pile construction. During the bored pile construction process, a large amount of drill cuttings will be generated at the bottom of the pile hole. If the drill cuttings are not removed in time, the drilling speed of the pile driver will be seriously affected. Excessive drill cuttings deposited at the bottom of the pile hole will also directly affect the quality of the bored pile. In the actual construction process, hole cleaning equipment is generally used to clean the pile hole of the bored pile to remove the drill cuttings at the bottom of the pile hole.

[0003] For example, the Chinese authorized patent with announcement number CN105649085A (bored cast-in-place pile hole cleaning device): includes a drill rod, on which is installed at least one stirring paddle, the stirring paddle consisting of a blade and a hub, the hub being clamped on the drill rod, the paddle having at least two blades and the blade faces being fixed upward on the hub, when the hole is cleaned once in a positive cycle, the drill rod drives the stirring paddle fixed thereon to rotate, and cooperates with the idling of the drill bit to effectively push the sediment floating at the bottom of the pile upward step by step, thereby improving the sediment carrying efficiency and reducing the sediment thickness, thereby improving the hole cleaning efficiency and the bearing capacity of the pile foundation; at the same time, the mud concentration at the bottom of the pile is relatively high, and the mud pushed upward by the paddle has a whitewashing effect on the hole wall, and the lifting effect of the paddle increases the circulation speed of the mud, accelerates the formation of mud skin, and reduces the occurrence of hole collapse. The device has a simple structure, is easy to operate, has high slag cleaning efficiency, deep slag cleaning depth, and good economic benefits, and is particularly effective in cleaning holes of ultra-deep bored cast-in-place piles.

[0004] However, the hole cleaning device in the above-mentioned prior art uses the rotation of the stirring paddle to gradually drive the mortar upward and remove it, but the mortar may fall during the lifting process, affecting the quality of its hole cleaning; therefore, it does not meet the existing needs. In this regard, we propose a bored pile auxiliary hole cleaning device and method. Summary of the Invention

[0005] The purpose of the present invention is to provide an auxiliary hole cleaning device and method for bored cast-in-place piles, so as to solve the problem that the hole cleaning device in the prior art proposed in the above background technology uses the rotation of the stirring paddle to gradually drive the mortar upward and remove it, but the mortar will fall during the lifting process, affecting the quality of its hole cleaning.

[0006] To achieve the above object, the present invention provides the following technical solution: bored pile auxiliary hole cleaning equipment, comprising a ground, a borehole is provided inside the ground, a mud circulation groove is provided on the top of one side of the borehole, and a sedimentation tank is provided on one side of the mud circulation groove;

[0007] Also includes:

[0008] A drill rod is arranged inside the drill hole, a drill bucket is provided at the bottom of the drill rod, a drill bit is provided at the bottom of the drill bucket, and a plurality of drill bits are provided, a spiral conveying rod is installed inside the drill bucket, and a plurality of spiral blades are provided on the spiral conveying rod;

[0009] A mortar separation cylinder is arranged at the top of the sedimentation tank, a slag discharge port is provided at the bottom of the mortar separation cylinder, an overflow port is provided at the top of the mortar separation cylinder, a double-leaf spiral rod is installed inside the mortar separation cylinder, and a plurality of spiral leaves are provided on the double-leaf spiral rod.

[0010] Preferably, turntables are provided on both sides of the drill rod, a casing is provided below the turntable, a second interface is provided on one end face of the top of the drill rod, and a connecting tube is provided on the top of the drill rod.

[0011] Preferably, a first connecting pipe is provided on one side of the connecting cylinder, a first mortar pump is installed on one side of the first connecting pipe, and a first motor is provided on one side of the first mortar pump.

[0012] Preferably, a partition plate is installed inside the sedimentation tank, and the height of the partition plate is half of the interior of both sides of the sedimentation tank, and a connecting hole is provided on one end surface of the sedimentation tank.

[0013] Preferably, a second connecting pipe is provided on the top and one end surface of the mortar separation cylinder.

[0014] Preferably, a perfusion catheter is provided on one side of the second connecting tube, and a first interface is provided on one side of the perfusion catheter.

[0015] Preferably, a second mortar pump is provided on one side of the second connecting pipe, and a second motor is provided on one side of the second mortar pump.

[0016] Preferably, a discharge pipe is installed on the other end surface of the second mortar pump.

[0017] Preferably, the method for auxiliary hole cleaning equipment of bored piles comprises the following steps:

[0018] Step 1: First, the hole cleaning should be carried out in two times. The first cleaning should be carried out after the hole is formed, and the second cleaning should be carried out after the steel cage is installed. The cleaning time should not be too long each time to prevent the hole from collapsing.

[0019] Step 2: Use the first mortar pump to clean the hole for the first time. Connect the air inlet pipe and the conduit used for pouring underwater concrete to the second interface. Install an elbow on the upper end of the drill pipe. To prevent the elbow from rotating and causing accidents, clamp it with logs and control the direction of the water spray.

[0020] Step 3: At the beginning, supply water to the hole, and then send compressed air into the hole through the air inlet pipe to clean the hole. When stopping the hole cleaning, turn off the air first and then the water to prevent the hole from collapsing due to water head loss. The air supply volume should be from small to large, and the air pressure should be slightly larger than the mud pressure at the bottom of the hole. The height of the original water head in the hole must always be maintained during the hole cleaning. After the end, remove the temporary rope, lift it into the air pipe, and use the first mortar pump to clean the hole. Use a steel pipe with a diameter of 00 to 20 mm, make an elbow at the upper end to facilitate slurry discharge, and weld a section of steel pipe with a diameter of 5 mm at the lower end, which is connected to the water supply hose of the high-pressure water pump. Start the high-pressure water pump to clean the hole, and the spiral conveying rod in the drill bucket lifts the mortar upward to the top of the drill pipe. The first mortar pump sucks out the mortar through the first connecting pipe and discharges it into the sedimentation tank through the discharge pipe. Since the sand and gravel are heavy and will sink to the bottom, the mortar water will cross the partition plate through the mud circulation tank and flow into the inside of the borehole;

[0021] Step 4: Then carry out the second hole cleaning operation. After the drilling rig reaches the end of the hole, stop advancing. At this time, slightly lift the cone head 10-20 cm away from the bottom of the hole and idle while maintaining normal mud circulation. Press pure mud with a specific gravity of 1.10-1.25 into the sedimentation tank through the second interface at a medium speed. The mud will enter the sedimentation tank through the mud circulation tank. A second mortar pump will pump the mud and sand into the mortar separation cylinder. The double-leaf spiral rod inside the mortar separation cylinder will transport the mud through the overflow port to the injection pipe. The sand and gravel will enter the sedimentation tank through the slag discharge port. In this way, the mud with more suspended drill cuttings in the borehole will be replaced. Depending on the specific conditions of the drilling hole, the slurry replacement time is 4 to 6 hours.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention sets a spiral conveying rod inside the drill bucket, uses a first mortar pump to clean the hole, connects the air inlet pipe and the conduit used for pouring underwater concrete to the second interface, installs an elbow on the upper end of the drill rod, clamps it with logs to prevent accidents caused by the elbow rotation, and controls the direction of water spraying. At the beginning, water is supplied to the hole, and then compressed air is sent into the hole through the air inlet pipe to clean the hole. When stopping the hole cleaning, the air is turned off first and then the water is cut off to prevent the hole from collapsing due to water head loss. The air supply volume should be from small to large, and the air pressure should be higher than the mud at the bottom of the hole. The slurry pressure is slightly higher, and the height of the original water head in the hole must always be maintained during hole cleaning. After the completion, the temporary rope is released, the air pipe is lifted, and the hole is cleaned with the first mortar pump. A steel pipe with a diameter of 0.0 to 20 mm is made into an elbow at the upper end to facilitate slurry discharge. A section of steel pipe with a diameter of 5 mm is welded at the lower end and connected to the water hose of the high-pressure water pump. The high-pressure water pump is started to clean the hole. The spiral conveying rod in the drill bucket lifts the mortar upward to the top of the drill pipe. The first mortar pump sucks the mortar out through the first connecting pipe and discharges it through the discharge pipe. After the slurry is discharged from the slurry circulation tank, the slurry will flow into the borehole through the mud circulation tank, and then the second hole cleaning operation will be carried out. After the drilling rig reaches the end of the hole, the drilling rig stops advancing. At this time, the cone head is slightly lifted 10-20 cm away from the bottom of the hole and idling and maintaining normal mud circulation. Pure mud with a specific gravity of 1.10-1.25 is pressed into the sedimentation tank through the mud circulation tank at a medium speed through the second interface. A second mortar pump draws the mud and sand into the mortar separation cylinder. The double-leaf screw inside the mortar separation cylinder transports the mud to the injection pipe through the overflow port, and the sand and gravel enter the sedimentation tank through the slag discharge port. In this way, the mud with more suspended drilling debris in the borehole is replaced. The slurry replacement and slurry extraction method can perform high-efficiency and high-quality hole cleaning operations inside the borehole during and after drilling, solving the problem that the hole cleaning device in the prior art uses the rotation of the agitator to gradually drive the mortar upward and remove it, but the mortar falls during the lifting process, affecting the quality of the hole cleaning.

[0024] 2. By setting a double-leaf spiral rod inside the mortar separation cylinder, the mortar is separated up and down along the axial direction and radial direction. The sand and gravel are discharged through the slag discharge port through the spiral leaves of the inner vortex, and the mud enters the injection conduit through the overflow port through the spiral leaves of the outer vortex, which can better separate the sand and gravel and improve the quality of hole cleaning.

[0025] 3. By using the methods of slurry replacement and slurry extraction to clean the inside of the borehole during the hole cleaning process, different methods can be used to clean the hole at different drilling stages to avoid the collapse of the hole wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the first hole cleaning of the present invention;

[0027] Figure 2This is a schematic diagram of the second hole cleaning of the present invention;

[0028] Figure 3 This is a schematic diagram of the internal structure of the mortar separation cylinder of the present invention;

[0029] Figure 4 Schematic diagram of the internal structure of the drill bucket of the present invention;

[0030] Figure 5 This is a schematic diagram of the hole cleaning steps of the present invention;

[0031] In the figure: 1. Ground; 2. First mortar pump; 3. First motor; 4. Drill hole; 5. Turntable; 6. Casing; 7. Drill rod; 8. Connecting tube; 9. First connecting pipe; 10. Mud circulation trough; 11. Connecting hole; 12. Sedimentation tank; 13. Partition plate; 14. Discharge pipe; 15. Drill bucket; 16. First interface; 17. Infusion conduit; 18. Second connecting pipe; 19. Second mortar pump; 20. Second motor; 21. Mortar separation tube; 22. Overflow port; 23. Double-leaf screw rod; 24. Second interface; 25. Drill bit; 26. Screw conveying rod; 27. Slag discharge port. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] See also Figure 1-5 The present invention provides an embodiment of a bored pile auxiliary hole cleaning device, comprising a ground 1, a borehole 4 is provided inside the ground 1, a mud circulation tank 10 is provided on the top of one side of the borehole 4, and a sedimentation tank 12 is provided on one side of the mud circulation tank 10;

[0034] Also includes:

[0035] A drill rod 7 is disposed inside the borehole 4. A drill bucket 15 is disposed at the bottom of the drill rod 7. A drill bit 25 is disposed at the bottom of the drill bucket 15. The drill bits 25 are provided in plurality. A screw conveying rod 26 is installed inside the drill bucket 15. The screw conveying rod 26 is provided with a plurality of spiral blades.

[0036] The mortar separation cylinder 21 is arranged at the top of the sedimentation tank 12. The bottom of the mortar separation cylinder 21 is provided with a slag discharge port 27. The top of the mortar separation cylinder 21 is provided with an overflow port 22. A double-leaf spiral rod 23 is installed inside the mortar separation cylinder 21, and a plurality of spiral blades are provided on the double-leaf spiral rod 23. The first hole cleaning is performed using the first mortar pump 2. The air inlet pipe and the conduit used for pouring underwater concrete are connected to the second interface 24. An elbow is installed at the upper end of the drill rod 7. In order to prevent the elbow from rotating and causing an accident, it is clamped with a log and the direction of the water spray is controlled. At the beginning, water is supplied to the hole. , and then send compressed air into the air inlet pipe to clean the hole. When stopping the hole cleaning, turn off the air first and then cut off the water to prevent the hole from collapsing due to water head loss. The air supply volume should be from small to large, and the air pressure should be slightly larger than the mud pressure at the bottom of the hole. The height of the original water head in the hole must always be maintained during the hole cleaning. After the end, the temporary rope is released, and the air pipe is lifted. The hole is cleaned with the first mortar pump 2. A steel pipe with a diameter of 00 to 20 mm is made into an elbow at the upper end to facilitate slurry discharge. A section of steel pipe with a diameter of 5 mm is welded at the lower end and connected to the water supply hose of the high-pressure water pump. The high-pressure water pump is started to clean the hole, and the spiral conveying rod 26 in the drill bucket 15 moves the mortar Lift it upwards to the top of the drill pipe 7, and the first mortar pump 2 sucks out the mortar through the first connecting pipe 9 and discharges it into the sedimentation tank 12 through the discharge pipe 14. Since the sand and gravel are heavy and will sink to the bottom, the mortar water will pass through the partition plate 13 and flow into the interior of the borehole 4 through the mud circulation tank 10; then the second hole cleaning operation is carried out. After the drilling rig reaches the end of the hole, the footage is stopped. At this time, the cone head is slightly lifted 10-20 cm away from the bottom of the hole and idled to maintain normal circulation of the mud. A relatively pure mud with a specific gravity of 1.10-1.25 is pressed in at a medium speed through the second interface 24. The mud will enter the sedimentation tank 1 through the mud circulation tank 10. 2. A second mortar pump 19 pumps mud and sand into the mortar separation drum 21. The double-leaf screw rod 23 inside the mortar separation drum 21 transports the mud to the injection pipe 17 through the overflow port 22. The sand and gravel enter the sedimentation tank 12 through the slag discharge port 27. In this way, the mud with a lot of suspended drilling debris in the borehole 4 is replaced by a cycle. According to the specific situation of the borehole 4, the slurry replacement time is 4 to 6 hours, which solves the problem that the hole cleaning device in the prior art uses the rotation of the stirring paddle to gradually drive the mortar upward and remove it, but the mortar will fall during the lifting process, affecting its hole cleaning quality.

[0037] See also Figure 1, both sides of the drill rod 7 are provided with a turntable 5, and a casing 6 is provided under the turntable 5. One end face of the top of the drill rod 7 is provided with a second interface 24. The top of the drill rod 7 is provided with a connecting tube 8. The air inlet pipe and the conduit used for pouring underwater concrete are connected to the second interface 24. An elbow is installed on the upper end of the drill rod 7. In order to prevent the elbow from rotating and causing an accident, it is clamped with a log and the direction of water spraying is controlled. At the beginning, water is supplied to the hole, and then compressed air is sent into the air inlet pipe to clean the hole. When the hole is stopped, the air is turned off first and then the water is cut off to prevent the hole from collapsing due to water head loss. The air supply volume should be from small to large, and the air pressure should be slightly larger than the mud pressure at the bottom of the hole. The height of the original water head in the hole must always be maintained during the hole cleaning. After the end, the temporary rope is released, the air pipe is lifted and the hole is cleaned with the first mortar pump 2.

[0038] See also Figure 1 A first connecting pipe 9 is provided on one side of the connecting tube 8 , a first mortar pump 2 is installed on one side of the first connecting pipe 9 , and a first motor 3 is provided on one side of the first mortar pump 2 .

[0039] See also Figure 1 A partition plate 13 is installed inside the sedimentation tank 12, and the height of the partition plate 13 is half of the interior of both sides of the sedimentation tank 12. A connecting hole 11 is provided on one end surface of the sedimentation tank 12.

[0040] See also Figure 2 and Figure 3 A second connecting pipe 18 is provided on the top and one end surface of the mortar separation cylinder 21.

[0041] See also Figure 2 A perfusion catheter 17 is provided on one side of the second connecting tube 18 , and a first interface 16 is provided on one side of the perfusion catheter 17 .

[0042] See also Figure 2 A second mortar pump 19 is provided on one side of the second connecting pipe 18, and a second motor 20 is provided on one side of the second mortar pump 19.

[0043] See also Figure 2, a discharge pipe 14 is installed on the other end face of the second mortar pump 19. The first mortar pump 2 sucks out the mortar through the first connecting pipe 9 and discharges it into the sedimentation tank 12 through the discharge pipe 14. Since the sand and gravel are heavy and will sink to the bottom, the mortar water will pass over the partition plate 13 and flow into the interior of the borehole 4 through the mud circulation groove 10. The purer mud with a specific gravity of 1.10-1.25 is pressed into the mud circulation groove 10 at a medium speed through the second interface 24. The mud will enter the sedimentation tank 12 through the mud circulation groove 10. The second mortar pump 19 draws the mud and sand into the mortar separation cylinder 21. The double-leaf screw rod 23 inside the mortar separation cylinder 21 transports the mud to the perfusion conduit 17 through the overflow port 22. The sand and gravel enter the sedimentation tank 12 through the slag discharge port 27. In this way, the mud with more suspended drill cuttings in the borehole 4 is replaced by circulation. According to the specific situation of the borehole 4, the slurry replacement time is 4 to 6 hours.

[0044] See also Figure 1-Figure 5 The method of auxiliary hole cleaning equipment for bored piles comprises the following steps:

[0045] Step 1: First, the hole cleaning should be carried out in two times. The first cleaning should be carried out after the hole is formed, and the second cleaning should be carried out after the steel cage is installed. The cleaning time should not be too long each time to prevent the hole from collapsing.

[0046] Step 2: Use the first mortar pump 2 to clean the hole for the first time. Connect the air inlet pipe and the conduit used for pouring underwater concrete to the second interface 24. Install an elbow on the upper end of the drill rod 7. To prevent the elbow from rotating and causing accidents, clamp it with logs and control the direction of water spraying.

[0047] 3. When the drilling rod 15 is jacked up, the mortar is sucked out through the drainpipe 2 and the drainpipe 3 is used to drain the mortar. When the drilling rod 15 is jacked up, the mortar is sucked out through the drainpipe 2 and the drainpipe 3 is used to drain the mortar. When the drilling rod 15 is jacked up, the mortar is sucked out through the drainpipe 2 and the drainpipe 3 is used to drain the mortar.

[0048] Step 4: Then carry out the second hole cleaning operation. After the drilling rig reaches the end of the hole, stop advancing. At this time, slightly lift the cone head 10-20 cm away from the bottom of the hole and idle while maintaining normal circulation of the mud. Press pure mud with a specific gravity of 1.10-1.25 at a medium speed through the second interface 24. The mud will enter the sedimentation tank 12 through the mud circulation groove 10. The second mortar pump 19 will pump the mud and sand into the mortar separation cylinder 21. The double-leaf screw rod 23 inside the mortar separation cylinder 21 will transport the mud to the injection conduit 17 through the overflow port 22. The sand and gravel enter the sedimentation tank 12 through the slag discharge port 27. In this way, the mud with more suspended drill cuttings in the borehole 4 is replaced by circulation. According to the specific situation of the borehole 4, the slurry replacement time is 4 to 6 hours.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A bored pile auxiliary hole cleaning device, comprising a ground (1), a borehole (4) provided inside the ground (1), a slurry circulation trough (10) provided on the top of one side of the borehole (4), and a sedimentation tank (12) provided on one side of the slurry circulation trough (10); Its characteristics are: Also includes: A drill rod (7) is arranged inside the drill hole (4); a drill bucket (15) is provided at the bottom of the drill rod (7); a drill bit (25) is provided at the bottom of the drill bucket (15); and a plurality of drill bits (25) are provided; a spiral conveying rod (26) is installed inside the drill bucket (15), and a plurality of spiral blades are provided on the spiral conveying rod (26); A mortar separation cylinder (21) is arranged at the top of the sedimentation tank (12), a slag discharge port (27) is provided at the bottom of the mortar separation cylinder (21), an overflow port (22) is provided at the top of the mortar separation cylinder (21), a double-leaf spiral rod (23) is installed inside the mortar separation cylinder (21), and a plurality of spiral leaves are provided on the double-leaf spiral rod (23); A turntable (5) is provided on both sides of the drill rod (7), a casing (6) is provided below the turntable (5), a second interface (24) is provided on one end surface of the top of the drill rod (7), and a connecting tube (8) is provided on the top of the drill rod (7); A first connecting pipe (9) is provided on one side of the connecting tube (8), a first mortar pump (2) is installed on one side of the first connecting pipe (9), and a first motor (3) is provided on one side of the first mortar pump (2); A partition plate (13) is installed inside the sedimentation tank (12), and the height of the partition plate (13) is half of the interior of both sides of the sedimentation tank (12). A communication hole (11) is provided on one end surface of the sedimentation tank (12); The top and one end surface of the mortar separation cylinder (21) are both provided with a second connecting pipe (18); A perfusion catheter (17) is provided on one side of the second connecting tube (18), and a first interface (16) is provided on one side of the perfusion catheter (17); A second mortar pump (19) is provided on one side of the second connecting pipe (18), and a second motor (20) is provided on one side of the second mortar pump (19).

2. The bored pile auxiliary hole cleaning device according to claim 1, characterized in that: A discharge pipe (14) is installed on the other end surface of the second mortar pump (19).

3. A method for auxiliary hole cleaning equipment for bored piles, based on the auxiliary hole cleaning equipment for bored piles according to claim 2, characterized in that: The following steps are involved: Step 1: First, the hole cleaning should be carried out in two times. The first cleaning should be carried out after the hole is formed, and the second cleaning should be carried out after the steel cage is installed. The cleaning time should not be too long each time to prevent the hole from collapsing. Step 2: The first hole cleaning is performed using the first mortar pump (2). The air inlet pipe and the conduit used for pouring underwater concrete are connected to the second interface (24). An elbow is installed at the upper end of the drill rod (7). To prevent the elbow from rotating and causing an accident, a log is used to clamp it and control the direction of the water spray. Step 3: At the beginning, water is supplied to the hole, and then compressed air is sent into the hole through the air inlet pipe to clean the hole. When the hole cleaning stops, the air is turned off first and then the water is cut off to prevent the hole from collapsing due to water head loss. The air supply volume should be increased from small to large, and the air pressure should be slightly higher than the mud pressure at the bottom of the hole. The original water head height in the hole must be maintained during the hole cleaning. After the end, the temporary rope is released, and the air pipe is lifted and introduced. The hole is cleaned with the first mortar pump (2). A steel pipe with a diameter of 0.0 to 20 mm is used. The upper end is made into an elbow to facilitate the discharge of slurry. The lower end is welded with a diameter of 5. A section of a steel pipe with a diameter of 1 mm is connected to the water supply hose of the high-pressure water pump. The high-pressure water pump is started to clean the hole. The spiral conveying rod (26) in the drill bucket (15) lifts the mortar upward to the top of the drill rod (7). The first mortar pump (2) sucks out the mortar through the first connecting pipe (9) and discharges it into the sedimentation tank (12) through the discharge pipe (14). Since the sand and gravel are heavy and will sink to the bottom, the mortar water will pass over the partition plate (13) and flow into the interior of the borehole (4) through the mud circulation tank (10); Step 4: After that, the second hole cleaning operation is carried out. After the drilling machine reaches the end of the hole, the drilling footage is stopped. At this time, the cone head is slightly lifted 10-20 cm away from the bottom of the hole and idling while maintaining normal mud circulation. A relatively pure mud with a specific gravity of 1.10-1.25 is pressed in at a medium speed through the second interface (24). The mud will enter the sedimentation tank (12) through the mud circulation groove (10). A second mortar pump (19) pumps the mud and sand into the mortar separation cylinder (21). The double-leaf spiral rod (23) inside the mortar separation cylinder (21) transports the mud through the overflow port (22) to the injection pipe (17). The sand and gravel enter the sedimentation tank (12) through the slag discharge port (27). In this way, the mud with more suspended drill cuttings in the borehole (4) is replaced by circulation. According to the specific conditions of the borehole (4), the slurry replacement time is 4 to 6 hours.

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