JP2008231682A - Drilling method and drilling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drilling method and a drilling device enabling slurry to be circulated for recycling by sufficiently supporting the wall surface of a hole under drilling. <P>SOLUTION: The bit 10 of a hydraulic rock drill 6 is inserted into a hole 98. The slurry in a slurry tank 20 is force-fed to the bit 10 by a squeeze pump 21 to discharge it from the bit 10. While the wall surface of the hole 98 is held by the slurry supplied into the hole 98 by a water collecting pipe 11, the slurry in the hole 98 is discharged to a separator 31 together with a flushing medium through a valve 19. The flushing medium is removed from the slurry in the separator 31, and the slurry is fed from the separator 31 into the slurry tank 20. With the slurry circulated as stated above, the hole 98 is drilled by the bit 10. During the drilling, the pressure of the slurry in the hole 98 is measured by a pressure sensor 16. When the pressure measured by the pressure sensor 16 is equal to or less than a predetermined value, the squeeze pump 21 is controlled by a controller 41, and the drive speed of the squeeze pump 21 is raised. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drilling method and a drilling apparatus for drilling natural ground.

Conventionally, using a rock drill attached to a drill jumbo, the drill bit is spouted from the bit of the rock drill to discharge the dust, and the bit is rotated to bring the bit to the end of the hole in the ground. The natural ground is drilled by making it collide. However, when drilling a defective ground, the ground of the wall of the hole softens due to contact / penetration with the drilling water and the hole wall collapses, making it impossible to drill any more, and the bit or rod It was left in the ground and was unrecoverable. As one method of drilling while retaining the hole wall even in such a bad ground, a method of mixing and using compressed air or bubbles instead of water for discharging dust can be considered. It is effective when the downward drilling hole or the drilling length is short (see, for example, Patent Document 1). However, in the case of horizontal drilling, when the drilling length is long, the chips accumulate in the lower part of the hole, and the long-distance transporting and discharging effect remains a question. As another drilling method, a method of inserting a pipe between the drilling water and the wall so that the drilling water does not touch the wall of the hole and the wall does not collapse, or mud is used instead of water. A method of drilling while holding the hole wall has also been proposed (see, for example, Patent Document 2). However, when the pipe is inserted, the remaining pipe becomes an obstacle to excavation when excavating the periphery of the hole. In addition, when using muddy water, the hole wall is held only by the muddy water and its contact wall surface. Upward, it was not easy to discharge heavy dust with a specific gravity more than muddy water, and the effect of transporting and discharging was in doubt. In addition, all of the drilling water used in the above drilling method always supplies new drilling water, and the used drilling water is drained along with the discharge of dust and is also efficient in terms of environment. But challenges remained.
Japanese Patent Publication No. 6-60553 JP-A-57-68490

  Then, this invention aims at providing the drilling method and drilling apparatus which can fully recycle | circulate and reuse muddy water while fully supporting the wall surface of the hole in drilling using muddy water. .

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a bit of a rock drill is inserted into a hole, muddy water is pumped to the bit by a pump, muddy water is ejected from the bit, and muddy water is injected into the hole. In a state where the muddy water in the hole is drained together with the dust while filling the hole, the pressure of the muddy water in the hole is measured with a pressure sensor, and the pressure measured by the pressure sensor is below a predetermined value. In this case, the drilling method is characterized in that the driving speed of the pump is increased.

  The invention according to claim 2 inserts a bit of a rock drill into the hole, pumps muddy water to the bit with a pump, jets muddy water from the bit, and fills the hole with muddy water. When the muddy water is drained with the dust through the valve, the pressure of the muddy water in the hole is measured with the pressure sensor and the bit is drilled, and the pressure measured by the pressure sensor falls below a predetermined value. The hole drilling method is characterized by narrowing the opening of the valve.

  The invention according to claim 3 is the hole drilling method according to claim 1 or 2, while holding the wall surface of the hole by forming a mud film on the wall surface of the hole by the muddy water sent to the hole, Drilling is performed by rotating and striking the bit.

  The invention according to claim 4 is the hole drilling method according to any one of claims 1 to 3, wherein the collected muddy water is collected by removing the dust from the muddy water discharged from the hole, and collecting the collected muddy water. The pump is pumped into the hole and can be used again.

The invention according to claim 5 is a rock drill having a bit inserted into the hole and drilled,
A pump for pumping muddy water to the bit and ejecting muddy water from the bit;
A cylindrical body that inserts the bit and is fitted into the opening of the hole, and drains the muddy water in the hole together with the dust while filling the hole with muddy water,
A pressure sensor that is provided inside the cylindrical body and measures the pressure of muddy water in the hole;
A control unit for controlling the pump based on the pressure measured by the pressure sensor,
The drilling device according to claim 1, wherein when the pressure measured by the pressure sensor becomes a predetermined value or less, the control unit increases the driving speed of the pump.

The invention according to claim 6 is a rock drill having a bit inserted into the hole for drilling,
A pump for pumping muddy water to the bit and ejecting muddy water from the bit;
A cylindrical body that inserts the bit and is fitted into the opening of the hole, and drains the muddy water in the hole together with the dust while filling the hole with muddy water,
A valve connected to the tubular body and controlling the flow rate of muddy water drained from the tubular body;
A pressure sensor that is provided inside the cylindrical body and measures the pressure of muddy water in the hole;
A control unit for controlling the valve based on the pressure measured by the pressure sensor,
The control unit throttles the opening of the valve when the pressure measured by the pressure sensor becomes a predetermined value or less.

The invention according to claim 7 is the drilling device according to claim 5 or 6,
A muddy water tank to store muddy water,
A drainage hose for draining muddy water mixed with powder from the cylindrical body,
A cam lock for connecting the tubular body and the drainage hose;
A separator for capturing and removing the dust from the muddy water mixed with the dust sent from the drainage hose;
A second pump for sending the muddy water from which the dust is removed by the separator to the muddy water tank,
The muddy water stored in the muddy water tank is pumped to the hole by the pump so that the muddy water can be used again.

  According to the first aspect of the present invention, when the pressure of the muddy water in the hole is measured by the pressure sensor and the measured pressure becomes a predetermined value or less, the pump driving speed is increased. The flow rate increases. Therefore, the pressure of the muddy water filled in the hole rises, and the pressure of the muddy water in the hole returns to a predetermined value or more. Therefore, the wall surface of the hole can always be sufficiently retained by the muddy water, and the collapse of the wall surface of the hole can be prevented.

  According to the second aspect of the present invention, the pressure of the muddy water in the hole is measured by the pressure sensor, and when the measured pressure falls below a predetermined value, the opening of the valve is throttled, so that the hole is filled. Muddy water is not easily drained from the hole. Therefore, the pressure of the muddy water filled in the hole rises, and the pressure of the muddy water in the hole returns to a predetermined value or more. Therefore, the wall surface of the hole can always be sufficiently retained by the muddy water, and the collapse of the wall surface of the hole can be prevented.

  According to the invention of claim 3, a mud film is formed on the wall surface of the hole by using muddy water instead of water as the drilling water, and the bit wall can be efficiently rotated and blown while holding the hole wall surface. Drilling can be performed.

  According to the invention which concerns on Claim 4, it removes from the muddy water discharged | emitted from the inside of a hole with the dipping powder, and pumps the collected muddy water to a muddy water tank by a pump, and uses again as drilling water again. can do.

  According to the invention according to claim 5, when the pressure of the muddy water in the hole is measured by the pressure sensor and the measured pressure becomes a predetermined value or less, the driving speed of the pump is increased by the control unit. The flow rate of muddy water sent to is increased. Therefore, the pressure of the muddy water filled in the hole rises, and the pressure of the muddy water in the hole returns to a predetermined value or more. Therefore, the wall surface of the hole can always be sufficiently retained by the muddy water, and the collapse of the wall surface of the hole can be prevented.

  According to the invention of claim 6, the pressure of the muddy water in the hole is measured by the pressure sensor, and when the measured pressure becomes a predetermined value or less, the opening of the valve is throttled by the control unit. The mud filled in is not easily drained from the hole. Therefore, the pressure of the muddy water filled in the hole rises, and the pressure of the muddy water in the hole returns to a predetermined value or more. Therefore, the wall surface of the hole can always be sufficiently retained by the muddy water, and the collapse of the wall surface of the hole can be prevented.

  According to the invention which concerns on Claim 7, from the muddy water discharged | emitted from the inside of the hole with the powder, the powder is removed by the separator, and the collected muddy water is pumped to the muddy water tank by the second pump. It can be recycled as drilling water.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.

  FIG. 1 is a drawing showing the condition of ground drilling in a tunnel in the tunnel longitudinal direction. In the vicinity of the tunnel face 99, a drill jumbo 1 which is a drilling device is arranged. The drill jumbo 1 has a traveling carriage 2 capable of traveling in a tunnel, and a boom 3 is connected to the traveling carriage 2.

  FIG. 2 is a view showing a tip portion of the boom 3. As shown in FIG. 2, guide cells 4 are connected to the tip of the boom 3, and these guide cells 4 extend in the front-rear direction. The guide cell 4 can be turned left and right with respect to the boom 3 and can be raised and lowered.

  The movable table 5 is slidably supported by the guide cells 4, and the movable table 5 is guided by the guide cells 4 to be movable in the front-rear direction. A hydraulic rock drill 6 is mounted on the movable table 5, and the hydraulic rock drill 6 is guided by the guide cell 4 and moves in the front-rear direction. The hydraulic rock drill 6 has a drilling rod 9 and a bit 10.

  A center riser 7 is provided at the front end of the guide cell 4, and a center riser 8 is also provided in front of the movable table 5. A drilling rod 9 is inserted into these centerers 7 and 8, and the drilling rod 9 is provided in parallel to the guide cell 4. Since the radial load of the drilling rod 9 is received by the center risers 7 and 8, the drilling rod 9 can be rotated around its axis and further moved in the axial direction.

  This drilling rod 9 is connected to the main body of the hydraulic rock drill 6. When hydraulic pressure is supplied to the main body of the hydraulic rock drill 6, the drilling rod 9 is rotated about its axis and hit by the main body of the hydraulic rock drill 6. Further, the drilling rod 9 moves back and forth together with the main body of the hydraulic rock drill 6.

  A bit 10 is attached to the tip of the drill rod 9. Further, a spout is formed at the tip of the bit 10, and a hollow is formed in the drill rod 9 along the axis of the drill rod 9, and the hollow of the drill rod 9 and the spout of the bit 10 communicate with each other. ing. Specifically, the drilling rod 9 is a tube rod. As shown in FIG. 1, one end of the hose 22 is connected to the hydraulic rock drill 6, the other end of the hose 22 is connected to the squeeze pump 21, and the muddy water tank 20 is connected to the squeeze pump 21. The muddy water stored in the muddy water tank 20 is sucked into the squeeze pump 21, and the muddy water is supplied to the hydraulic rock drill 6 by the squeeze pump 21. The muddy water supplied to the hydraulic rock drill 6 is pumped to the bit 10 through the hollow of the drilling rod 9, and the muddy water sent to the bit 10 is ejected from the outlet of the bit 10. In addition, a check valve (for example, a commercially available check valve used in a watertight tunnel) is provided at the injection port of the bit 10, and the water ejected from the bit 10 is cut through the bit 10. Backflow to the hole rod 9 is suppressed by the check valve. The muddy water tank 20 and the squeeze pump 21 are mounted on a work vehicle 23. The muddy water stored in the muddy water tank 20 is a bentonite aqueous solution. Any one or more of a mud inhibitor, a thickener, or a polymer solution may be added to the bentonite aqueous solution, and the muddy water may be stored in the muddy water tank 20 and pumped by the squeeze pump 21. Thus, in this embodiment, muddy water is used instead of water as the drilling water.

  The drive speed of the squeeze pump 21 (the rotational speed of the drive motor that is the power source of the squeeze pump 21) can be adjusted. By adjusting the drive speed of the squeeze pump 21, the amount of muddy water supplied per unit time can be reduced. Adjusted. The driving speed of the squeeze pump 21 is set by an operator and further set by the controller 41. The controller 41 is a control circuit or a control computer.

  FIG. 3 is a drawing showing a tip portion of the hydraulic rock drill 6. As shown in FIG. 3, a cylindrical water collecting pipe 11 is disposed in front of the center riser 7, and a drill rod 9 is passed through the water collecting pipe 11. Ring-shaped rubber packings 12 and 13 are arranged on the base end side of the water collecting pipe 11, the rubber packings 12 and 13 are fitted into a cylindrical stopper 14, and the base end portion of the water collecting pipe 11 is further connected to the stopper 14. The rubber packings 12 and 13 are sandwiched between the base end surface of the water collecting pipe 11 and the inner convex edge of the stopper 14. The drilling rod 9 is passed through the stopper 14 and the rubber packings 12 and 13. A ring-shaped packing 15 is provided at the tip of the water collecting pipe 11. The tip of the water collecting pipe 11 is fitted into the opening of the hole 98 of the face 99, and the hole 98 is filled with muddy water ejected from the bit 10 by the water collecting pipe 11, the rubber packings 12, 13 and the stopper 14. The water collecting pipe 11 is also a support body that prevents the opening end of the hole 98 of the face 99 from collapsing. The rubber packings 12 and 13 and the ring-shaped packing 15 are water blocking materials, and the packing 15 prevents the muddy water in the hole 98 from leaking into the gap between the outer peripheral surface of the water collecting pipe 11 and the side wall surface of the hole 98. Water leakage is prevented by the rubber packings 12 and 13. Further, since the drill rod 9 is a commercially available tube rod, the cross-sectional diameter over the entire length of the rod necessary for long-distance drilling is unchanged, and muddy water does not leak from the clearance between the drill rod 9 and the water collecting pipe. Thus, water tightness in the hole 98 and the water collecting pipe 11 is maintained. In addition, what assembled the water collection pipe 11, the rubber packings 12 and 13, the ring-shaped packing 15, and the stopper 14 is a cylindrical body.

  A pressure sensor 16 is provided inside the water collection pipe 11. The pressure sensor 16 measures the muddy water pressure in the water collecting pipe 11 and displays the measured pressure value with a needle or a display. Further, the measured pressure is converted into an electrical signal by the pressure sensor 16, a signal representing the pressure is fed back to the controller 41, and the pressure of the pressure sensor 16 is monitored by the controller 41. The controller 41 has a function of controlling the driving speed of the squeeze pump 21 based on the pressure measured by the pressure sensor 16.

  A drain hose 18 is connected to an intermediate portion of the water collecting pipe 11 by a cam lock 17. A valve 19 is provided in front of the cam lock 17, and the flow rate of muddy water drained from the water collecting pipe 11 to the drain hose 18 is adjusted by adjusting the opening amount of the valve 19.

  The drain hose 18 is connected to the separator 31, and the muddy water drained from the water collecting pipe 11 is sent to the separator 31. The dust in the muddy water sent to the separator 31 is captured by the separator 31. The separator 31 is provided with a second pump 32, and the muddy water from which the dust is removed is sent to the muddy water tank 20 by this pump 32.

Subsequently, a drilling method using the drill jumbo 1 will be described.
First, the face 99 is drilled in the horizontal direction with the parent and child bit. If the diameter of the parent and child bit is the same as the diameter of the tip of the water collecting pipe 11 or slightly larger than the diameter of the tip of the water collecting pipe 11, the diameter of the hole 98 drilled in the face 99 is the water collecting pipe. 11 is approximately equal to the diameter of the tip portion. For example, when the diameter of the tip of the water collecting pipe 11 is 118 mm, the diameter of the parent-child bit is 120 mm. In addition, when the length of the water collection pipe 11 is 870 mm, it is preferable that the depth of the hole 98 drilled in the face 99 is 20 to 30 cm.

  Next, the water collecting pipe 11 with the ring-shaped packing 15 attached to the tip end is fitted into the opening of the hole 98 drilled in the face 99, and the stopper 14 and the rubber packings 12 and 13 are inserted into the drilling rod 9. . A drilling rod 9 equipped with a bit 10 at the distal end is inserted into the water collecting pipe 11 and is also inserted into the hole 98 of the face 99, and the rubber packings 12 and 13 and the base end of the water collecting pipe 11 are fitted into the stopper 14. Include. Then, by pressing the center riser 7 against the stopper 14, the rubber packings 12 and 13 are sandwiched between the water collecting pipe 11 and the stopper 14, and the water collecting pipe 11 does not come out from the hole 98 of the face 99. Next, the drain hose 18 is connected to the intermediate portion of the water collecting pipe 11 by the cam lock 17. This completes the preparation. For example, when the diameter of the tip of the water collecting pipe 11 is 118 mm, the diameter of the bit 10 provided in the drilling rod 9 is preferably about 65 mm.

  Next, the squeeze pump 21 is driven with the valve 19 opened at a predetermined opening, and the drive speed of the squeeze pump 21 is maintained at a predetermined set speed by the setting of the operator or by the control of the controller 41. The muddy water in the muddy water tank 20 is pumped to the bit 10 by the squeeze pump 21 through the hose 22, the hydraulic rock drill 6 and the drilling rod 9, and muddy water is ejected from the bit 10. Since the water collecting pipe 11 is fitted into the hole 98 of the face 99 and the valve 19 is connected to the water collecting pipe 11, the muddy water ejected from the bit 10 is filled in the hole 98 of the face 99. A mud film is formed on the wall surface of the hole 98 by the muddy water in the hole 98 to hold the wall surface of the hole 98. In a state where the hole 98 of the face 99 is filled with muddy water, the muddy water in the hole 98 is drained to the separator 31 through the cam lock 17, the valve 19 and the drain hose 18, and the dust is captured by the separator 31. The muddy water from which the dust is removed is sent to the muddy water tank 20 by the pump 32. Thus, muddy water is circulated by the squeeze pump 21 and the pump 32. Since the muddy water is circulated, there is no need for waste disposal.

  In the state in which the muddy water is filled in the hole 98 and the muddy water circulates, a mud film is formed on the wall surface of the hole 98 and the wall surface of the hole 98 is held, the drilling rod 9 is rotated by the hydraulic rock drill 6 and Make a blow. Then, with the drilling rod 9 and the bit 10 rotating and striking, the hydraulic rock drill 6, the drilling rod 9 and the bit 10 are advanced, and the bit 10 is made to collide with the end of the hole 98. Drill holes. After that, drilling is performed with the bit 10 while the bit 10 is rotated and blown. Thus, in addition to the muddy water ejection pressure ejected from the bit 10, the hole 10 can be drilled by the rotation and impact force of the bit 10. Here, since the muddy water is filled in the hole 98, the wall surface of the hole 98 can be more effectively prevented from collapsing. In particular, collapse of the arch-shaped wall portion on the upper side of the hole 98 can be suppressed. In addition, the crushed powder per bump 98, that is, the dust powder, is discharged from the water collecting pipe 11 together with the muddy water and is captured by the separator 31.

  During the drilling as described above, when the squeeze pump 21 is operating, the pressure of the muddy water in the hole 98 of the face 99 is measured by the pressure sensor 16. When the pressure measured by the pressure sensor 16 falls below a predetermined value, the operator operates the squeeze pump 21 to increase the driving speed of the squeeze pump 21 by a predetermined amount, and the speed (from the speed before the increase). Is also maintained at a high rate by a predetermined amount). Alternatively, when the pressure measured by the pressure sensor 16 is monitored by the controller 41 and the controller 41 determines that the measured pressure has become a predetermined value or less, the driving speed of the squeeze pump 21 is increased by a predetermined amount by the controller 41. And maintained at that speed (a speed higher by a predetermined amount than the speed before ascending).

  As described above, by adjusting the driving speed of the squeeze pump 21 by the operator or the controller 41, the muddy water pressure in the hole 98 is maintained at a predetermined value or more. Part of the muddy water penetrates into the wall surface of the hole 98 and the muddy water pressure in the hole 98 decreases, but the decrease in the muddy water pressure can be suppressed by adjusting the driving speed of the squeeze pump 21. Therefore, the wall surface of the hole 98 can always be sufficiently retained by the muddy water, and the collapse of the wall surface of the hole 98 can be reliably prevented.

  In addition, the squeeze pump 21 is stopped during the chiseling operation of the drill rod 9, but since a check valve is provided at the injection port of the bit 10, the backflow of muddy water can be prevented.

  In the above embodiment, the drive speed of the squeeze pump 21 is adjusted during drilling, but the opening of the valve 19 may be adjusted. In other words, when the pressure measured by the pressure sensor 16 falls below a predetermined value during drilling, the operator operates the valve 19 instead of the squeeze pump 21 to reduce the opening of the valve 19 by a predetermined amount and open the valve 19. Maintain a degree (opened by a predetermined amount from the opening before turning). Alternatively, when the pressure measured by the pressure sensor 16 is monitored by the controller 41 and the controller 41 determines that the measured pressure has become a predetermined value or less, the opening degree of the valve 19 is reduced by a predetermined amount by the controller 41. It is maintained at the opening degree (an opening degree that is reduced by a predetermined amount from the opening degree before the throttle). When adjusting the opening degree of the valve 19, it is preferable to keep the driving speed of the squeeze pump 21 constant. By adjusting the opening degree of the valve 19 as described above, it is possible to suppress a decrease in the muddy water pressure in the hole 98, and to reliably prevent the wall surface of the hole 98 from collapsing.

  Further, the bentonite aqueous solution has been described as an example of mud water, but mud water other than the bentonite aqueous solution may be used, and other mud prevention agents, thickeners, or polymer mixed mud water may be used. As long as the wall surface of the hole 98 does not collapse, simple water may be used.

It is the side view which showed the whole drill jumbo. It is the side view which showed the rock drill etc. with which the said drill jumbo is equipped. It is drawing shown in the state which fractured | ruptured the cylindrical body with which the said rock drill is mounted | worn.

Explanation of symbols

1 Drill jumbo (drilling device)
6 Rock drill 10 Bit 11 Catchment pipe 12, 13 Rubber packing 14 Stopper 16 Pressure sensor 21 Squeeze pump 41 Controller (control unit)

Claims (7)

  Insert a rock drill bit into the hole, pump muddy water into the bit with a pump to eject the muddy water from the bit, and drain the muddy water in the hole together with the dust while filling the hole with muddy water. In the state where the pressure of muddy water in the hole is measured by a pressure sensor, the bit is drilled, and when the pressure measured by the pressure sensor becomes a predetermined value or less, the driving speed of the pump is increased. Drilling method.   A bit of a rock drill is inserted into the hole, muddy water is pumped to the bit by a pump, and muddy water is ejected from the bit, and the muddy water in the hole is filled through the valve while filling the muddy water in the hole. In addition, the pressure of the muddy water in the hole is measured with a pressure sensor while the water is being drained, and the bit is drilled with the bit, and when the pressure measured by the pressure sensor falls below a predetermined value, the opening of the valve is reduced. A hole drilling method characterized by that.   3. A hole is formed by rotating and striking the bit while holding the wall surface of the hole by forming a mud film on the wall surface of the hole by muddy water sent to the hole. Drilling method as described in 4.   4. The method according to any one of claims 1 to 3, wherein water is collected by removing waste powder from the mud discharged from the hole, and the collected mud is pumped to the hole by the pump to be used again. The drilling method according to one item. A rock drill with a bit inserted into the hole for drilling;
A pump for pumping muddy water to the bit and ejecting muddy water from the bit;
A cylindrical body that inserts the bit and is fitted into the opening of the hole, and drains the muddy water in the hole together with the dust while filling the hole with muddy water,
A pressure sensor that is provided inside the cylindrical body and measures the pressure of muddy water in the hole;
A control unit for controlling the pump based on the pressure measured by the pressure sensor,
The drilling device, wherein the control unit increases the driving speed of the pump when a pressure measured by the pressure sensor becomes a predetermined value or less. A rock drill with a bit inserted into the hole for drilling;
A pump for pumping muddy water to the bit and ejecting muddy water from the bit;
A cylindrical body that inserts the bit and is fitted into the opening of the hole, and drains the muddy water in the hole together with the dust while filling the hole with muddy water,
A valve connected to the tubular body and controlling the flow rate of muddy water drained from the tubular body;
A pressure sensor that is provided inside the cylindrical body and measures the pressure of muddy water in the hole;
A control unit for controlling the valve based on the pressure measured by the pressure sensor,
The drilling device according to claim 1, wherein when the pressure measured by the pressure sensor becomes equal to or less than a predetermined value, the control unit throttles the opening of the valve. A muddy water tank to store muddy water,
A drainage hose for draining muddy water mixed with powder from the cylindrical body,
A cam lock for connecting the tubular body and the drainage hose;
A separator for capturing and removing the dust from the muddy water mixed with the dust sent from the drainage hose;
A second pump for sending the muddy water from which the dust is removed by the separator to the muddy water tank,
The drilling device according to claim 5 or 6, wherein the muddy water stored in the muddy water tank is pumped to the hole by the pump so that the muddy water can be used again.

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