JP4264334B2 - Drilling device - Google Patents

Description

  The present invention relates to a drilling device, and more particularly to a drilling device provided with a hydraulic hammer on the tip side of a drilling tube.

  As a hole drilling device, a hole drilling device provided with a pneumatic or hydraulic hammer in order to apply a striking force to a bit is known (see, for example, JP-A-2001-3667). 5A and 5B are diagrams showing an example of a conventional drilling device, in which FIG. 5A is a longitudinal sectional view of a main part, and FIG. This drilling device is provided with a hydraulic hammer (hammer device) on the tip side of the drilling tube, and a bit 2 for excavating the ground is attached to the tip of the hydraulic hammer 4. Bit 2 includes a bit shank portion 12. In order to transmit the rotational force to the bit 2 from the drilled tube side and to allow the bit 2 to vibrate in the axial direction by the striking force from the hydraulic hammer 4, a spline 18 is provided on the outer peripheral surface of the bit shank portion 12 within a predetermined range. A bit sub 20 provided with a groove 19 corresponding to the spline 18 of the bit shank portion 12 on the inner peripheral surface is screwed to the hydraulic hammer 4. In order to prevent the bit 2 from falling off, the bit shank portion 12 is provided with a retainer ring 22 formed of a half ring, and the retainer ring 22 is locked to the inner end face of the bit sub 20 so that the bit 2 is not dropped off. It is prevented.

  In order to drive the hydraulic hammer 4, high-pressure drive water is pumped and supplied to the hydraulic hammer 4 from the ground by a high-pressure pump. The used driving water (also called driving drainage) used in the hydraulic hammer 4 is discharged to the ground side (excavation side) through the discharge hole 40 provided in the bit shank portion 12 and the bit 2, and the slime is discharged to the ground. It is used as slime treated water for carrying out unloading treatment.

JP 2001-3667 A

  However, in the drilling device, in order to drive the hydraulic hammer, it is necessary not only to secure a large amount of driving water (fresh water) at the site, but also from the hydraulic hammer to the ground, for the slime carry-out processing. It is also necessary to treat a large amount of used driving wastewater (muddy water containing slime, etc.) at the site. Although it is possible to use the driving wastewater again as the driving water, in order to use the driving wastewater again as the driving water, it is necessary to separate and remove slime from the driving wastewater, and a large-scale processing plant for that purpose. At present, equipment is required, and it is difficult to reuse the driving wastewater.

  The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a drilling device capable of reusing driving wastewater without requiring a large-scale treatment plant facility and reducing operating costs. And

  Among the present inventions, the invention of claim 1 comprises a drilling tube having a bit for excavating the ground at the tip, and a hydraulic hammer provided on the tip side in the drilling tube and giving a striking force to the bit. In the drilling device provided, the drilling pipe includes an inner pipe, and a driving water supply pipe for supplying driving water from the ground to the hydraulic hammer is provided in the inner pipe, the driving water supply pipe and the inner pipe A slime treated water supply for supplying the slime treated water to the excavation section between the inner pipe and the outer pipe is a return passage for returning used drive water drained from the hydraulic hammer to the ground. It is characterized by a passage.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the drilling pipe, the inner pipe and the driving water supply pipe are provided coaxially.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the inner pipe is provided with a pedestal portion for attaching a rear end portion of the hydraulic hammer, and the bit shank portion connecting the hydraulic hammer and the bit has a hydraulic pressure. A discharge port for discharging the used drive water from the type hammer into the inner pipe is provided, and a water stop member is provided between the bit shank portion and the inner pipe to prevent the drive water from flowing out to the bit side. The pedestal is provided with a reflux hole for returning the driving water to the ground.

  The invention of claim 4 is characterized in that, in the invention of claim 1, 2, or 3, the drilling pipe, the inner pipe and the driving water supply pipe are configured to be connectable to appropriate lengths.

  According to the present invention, the following effects can be achieved.

  According to the first aspect of the present invention, a drilling pipe comprising a drilling pipe having a bit for excavating the ground at the tip part, and a hydraulic hammer provided on the tip side in the drilling pipe and giving a striking force to the bit. In the hole device, the drilling pipe includes an inner pipe, and a driving water supply pipe for supplying driving water from the ground to the hydraulic hammer is provided in the inner pipe, and the driving water supply pipe and the inner pipe A space between the inner pipe and the outer pipe serves as a slime-treated water supply passage for supplying the slime-treated water to the excavation part. Therefore, it becomes possible to circulate and use the driving water and the slime treated water, respectively, and the driving wastewater can be reused without requiring a large-scale treatment plant facility, and the operation cost can be reduced.

  According to the second aspect of the present invention, since the drilling pipe, the inner pipe and the driving water supply pipe are provided coaxially, it is possible to circulate and use driving water and supply slime treated water with a simple structure. .

  According to a third aspect of the present invention, the inner pipe is provided with a pedestal portion for attaching a rear end portion of the hydraulic hammer, and the bit shank portion connecting the hydraulic hammer and the bit has a used drive from the hydraulic hammer. A discharge port for discharging water into the inner pipe is provided, and a water stop member is provided between the bit shank portion and the inner pipe to prevent the driving water from flowing out to the bit side. Since a return hole is provided to return to the ground, the used drive drain discharged from the hydraulic hammer can be easily returned to the ground without being discharged to the ground and reused as drive water (circulation use). be able to.

  According to the invention of claim 4, since the drilling pipe, the inner pipe and the driving water supply pipe are configured to be connectable to appropriate lengths, the drilling pipes are appropriately lengthened according to the depth of the rock. Can be used extended.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a main part of a drilling apparatus according to an embodiment of the present invention, FIG. 2 is a diagram showing an intermediate drilling pipe, (a) is a longitudinal sectional view, and (b) is (a 3 is a cross-sectional view taken along line AA in FIG. 3, FIG. 3 is a view showing a drilled tube at the tip, FIG. 4A is a vertical cross-sectional view, FIG. 3B is a cross-sectional view taken along line BB in FIG. It is a principal part longitudinal cross-sectional view of this hole drilling apparatus.

  In these drawings, 1 is a drilling device, and this drilling device 1 is provided at the tip side of the drilling tube 3 having a bit 2 for excavating the ground at the tip portion, and the drilling tube 3, A hydraulic hammer (hammer device) 4 is provided for applying a striking force to the bit 2. The drilling pipe 3 includes an inner pipe 5 on the inner side, and a driving water supply pipe 6 for supplying driving water from the ground to the hydraulic hammer 4 is provided in the inner pipe 5. Between the inner pipe 5 and the inner pipe 5 (annular passage) is a return passage 7 for returning used driving water (also called driving drainage) drained from the hydraulic hammer 4 to the ground. A space (annular passage) between the drilling pipe 3 that is a pipe serves as a slime treated water supply passage 8 that supplies the slime treated water to the excavation part.

  The inner pipe 5 is integrally mounted in the drilling pipe 3 via mounting members 9 arranged at appropriate intervals on the inner periphery of the drilling pipe 3 which is an outer pipe, and the drive water supply pipe 6 is connected to the inner pipe 5. It is integrally attached in the inner pipe 5 via attachment members 10 arranged at appropriate intervals around the circumference. The drilling pipe 3, the inner pipe 5 and the driving water supply pipe 6 are provided coaxially, that is, concentrically, and have a triple pipe structure.

  The inner pipe 5 is integrally provided with a pedestal portion 11 for attaching a rear end portion of the hydraulic hammer 4, and an outer peripheral surface of a bit shank portion 12 connecting the hydraulic hammer 4 and the bit 2 is formed from the hydraulic hammer 4. A discharge port 13 for discharging the used drive water (drive drainage) into the inner pipe 5 is provided. Between the bit shank portion 12 and the inner pipe 5, there is provided a water stop member such as an O-ring 14 that prevents the driving water from flowing out to the bit 2 side (excavation portion side, ground side). A reflux hole 15 is provided for returning the drive water (drive drainage) discharged from the discharge port 13 to the ground.

  The hydraulic hammer (hammer device) 4 has a hammer main body (hammer device main body) 4 a, and a rear end portion of the hammer main body 4 a is attached and fixed to the pedestal portion 11. A connecting port 16 for connecting the distal end portion of the drive water supply pipe 6 is provided in the axial center portion of the pedestal portion 11, and the distal end portion of the drive water supply pipe 6 is airtightly connected to the connection port 16 via an O ring 17. Inserted and connected to.

  Bit 2 includes a bit shank portion 12. A spline 18 is provided on the outer peripheral surface of the bit shank portion 12 in order to transmit the rotational force to the bit 2 from the side of the drilled tube 3 and to allow the bit 2 to vibrate in the axial direction by the striking force from the hydraulic hammer 4. A bit sub 20 having a groove 19 corresponding to the spline 18 of the bit shank portion 12 is screwed to the hammer main body 4a of the hydraulic hammer 4 in a range. In order to prevent the bit 2 from falling off, the rear end portion of the bit shank portion 12 is provided with a rear end flange portion 21 smaller than the inner diameter of the bit sub 20 and at the front side of the rear end flange portion 21 is a half ring. The retainer ring 22 is attached, and the retainer ring 22 is locked to the inner end face of the bit sub 20 to prevent the bit 2 from falling off. More specifically, the inner diameter of the retainer ring 22 is slightly larger than the outer diameter of the bit shank portion 12, and the outer diameter of the bit shank portion 12 is larger than the inner diameter of the bit sub 20 and smaller than the inner diameter of the hammer body 4a. Is formed.

  A front end flange portion 23 that is larger than the outer diameter of the bit sub 20 and smaller than the inner diameter of the inner tube 5 is provided on the distal end side of the bit shank portion 12. An outlet 13 is formed in the radial direction of the bit shank portion 12. A drainage passage 24 that communicates the discharge port 13 with the driving water drainage portion in the hammer body 4a is provided in a substantially axial center portion of the bit shank portion 12 on the rear side of the front end flange portion 23. An O-ring 14 that is a water stop member is provided between the outer peripheral surface of the front end flange portion 23 and the inner peripheral surface of the inner tube 5. The bit 2 is not provided with a drainage hole for draining the driving drainage to the excavation part side as in the prior art. A space between the hammer body 4a and the inner pipe 5 serves as a front reflux passage 25 for returning the driving drainage discharged from the discharge port 13 to the rear side, that is, the ground side. In order to communicate with the passage 7, the pedestal 11 is provided with a plurality of reflux holes 15 at appropriate intervals in the circumferential direction.

  The drilling pipe 3, the inner pipe 5 and the driving water supply pipe 6 are configured to be connectable to appropriate lengths. The drilling tube 3 is divided into a tip tube (tip drilling tube) 3a having a hydraulic hammer 4 and a triple tube (intermediate drilling tube) 3b having a driving water supply tube 6, and the tip tube 3a and the triple tube are divided. The tube 3b can be connected, and the triple tubes 3b can be connected to each other. In the case of the illustrated example, an internal thread portion 26 is provided on the inner periphery of the rear end portion of the distal end tube 3a, and an external thread portion 27 that is screwed to the internal thread portion 26 is provided on the outer periphery of the distal end portion of the triple tube 3b. Further, a female screw portion 28 for screwing the male screw portion 27 at the tip end portion of the other triple tube 3b is provided on the inner periphery of the rear end portion of the triple tube 3b.

  The inner tube 5 is divided into an inner tube 5a on the tip tube 3a side and an inner tube 5b on the triple tube 3b side. These inner tubes 5a and 5b are connectable, and the inner tubes 5b and 5b are connected. It is possible. In the illustrated example, the outer diameter of the inner tube 5b of the triple tube 3b is formed smaller than the inner diameter of the inner tube 5a of the tip tube 3a, and the tip of the inner tube 5b of the triple tube 3b is located behind the inner tube 5a of the tip tube 3a. The end portion is hermetically inserted and connected via an O-ring 29. A connecting pipe part 30 having an inner diameter larger than the outer diameter of the inner pipe 5b is provided at the rear end of the inner pipe 5b of the triple pipe 3b, and the inner pipe of another triple pipe 3b is connected to the connecting pipe part 30. The tip of 5b is inserted and connected via an O-ring. Similarly, a connecting pipe portion 31 having an inner diameter larger than the outer diameter of the driving water supply pipe 6 is provided at the rear end portion of the driving water supply pipe 6 of the triple pipe 3b. The tip of the drive water supply pipe 6 of the other triple pipe 3 b is inserted and connected via an O-ring 32.

  The drilling pipe 3 configured as described above is a base end portion (rear end portion) via a driving water supply / drainage and a slime-treated water supply swivel to a drifter which is a rotary drive mechanism of a rotary drill machine, for example, a work machine. For example, the ground drilling tube 3 is pushed vertically while rotating around the axis while standing perpendicular to the ground, and the ground is drilled. The swivel is connected to a high-pressure pump for supplying the drive water from the drive water tank (water tank) to the hydraulic hammer 4 via the drive water supply pipe 6, and the used drive drainage via the hydraulic hammer 4 is used. The water is returned to the driving water tank via the reflux passage 7 (including the tip reflux passage 25) and the swivel in the drilling tube 3, and is reused (circulated) as driving water. The swivel is connected to a pump for supplying the slime treated water from the slime treated water tank (water tank) to the ground at the tip of the drilling pipe through the slime treated water supply passage 6, and the slime treated water is obtained by excavating the ground. Along with the generated slime, etc., it passes through the gap between the drilling tube 3 and the inner wall of the drilling hole and is returned to the slime-treated water tank, and the slime-treated wastewater (preferably its supernatant) is reused (circulated) as the slime-treated water. It has become so.

  According to the drilling device 1 having the above-described configuration, a drilling tube 3 having a bit 2 for excavating the ground at the distal end portion and a distal end side in the drilling tube 3 are provided, and an impact force is applied to the bit 2. The drilling pipe 3 has an inner pipe 5, and a driving water supply pipe 6 for supplying driving water to the hydraulic hammer 4 from the ground is provided in the inner pipe 5. The space between the driving water supply pipe 6 and the inner pipe 5 serves as a return passage 7 for returning used driving water drained from the hydraulic hammer 4 to the ground, and the inner pipe 5 and the drilled pipe 3 Since the slime treated water supply passage 8 for supplying slime treated water to the excavation section is provided between the two, the drive water and the slime treated water can be circulated and used independently, and a large treatment plant facility is required. The driving wastewater can be reused without the need for equipment and operating costs. It can be achieved.

  Further, since the drilling pipe 3, the inner pipe 5 and the driving water supply pipe 6 are provided coaxially and have a triple pipe structure, the driving water and the slime treated water are separated by a simple structure. The used drive water (drive drainage) after being used for driving the hydraulic hammer 4 can be returned to the ground without being mixed with slime.

  The inner pipe 5 is provided with a pedestal portion 11 for attaching the rear end portion of the hydraulic hammer 4, and the bit shank portion 12 for connecting the hydraulic hammer 4 and the bit 2 to the used driving water from the hydraulic hammer 4 ( A discharge port 13 for discharging the drive drainage) into the inner pipe 5 is provided, and a water stop is provided between the bit shank part 12 and the inner pipe 5 to prevent the drive water from flowing out to the bit 2 side (excavation part side). A member, for example, an O-ring 14 is provided, and the pedestal portion 11 is provided with a return hole 15 for returning used drive water to the ground, so that used drive water discharged from the hydraulic hammer 4 can be used. It can be easily returned to the ground without being discharged to the ground side (excavated part side) and reused (circulated) as drive water.

  Since the drilling pipe 3, the inner pipe 5 and the driving water supply pipe 6 are configured to be connectable to appropriate lengths, the drilling pipe 3 is used by extending the length appropriately according to the depth of the rock. be able to. In the hole drilling tube 3, a hydraulic hammer 4 that gives a striking force to the bit 2 is provided on the tip side in the hole drilling tube 3, so that a hydraulic type is provided on the rear end side (top side) of the hole drilling tube 3. The striking force can be directly applied to the bit 2 without attenuating the striking force as compared with the case where a hammer is provided, and the drilling performance can be improved.

  Although the embodiments and examples of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above-described embodiments and examples, and various design changes can be made without departing from the gist of the present invention. Etc. are possible. For example, when connecting the inner tube of the tip tube and the inner tube of the triple tube, or connecting the inner tubes of the triple tube, the insertion connection structure is adopted in the above embodiment, but the tip tube and the triple tube are connected. A screw connection structure may be employed as in the case of performing.

It is a principal part longitudinal cross-sectional view which shows the drilling apparatus which is embodiment of this invention. It is a figure which shows an intermediate | middle drilling pipe, (a) is a longitudinal cross-sectional view, (b) is the sectional view on the AA line of (a). It is a figure which shows the drilling pipe | tube of a front-end | tip, (a) is a longitudinal cross-sectional view, (b) is the BB sectional drawing of (a). It is a principal part longitudinal cross-sectional view of the hole drilling apparatus of FIG. It is a figure which shows an example of the conventional drilling apparatus, (a) is a principal part longitudinal cross-sectional view, (b) is CC sectional view taken on the line of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drilling device 2 Bit 3 Drilling pipe 4 Hydraulic hammer 5 Inner pipe 6 Drive water supply pipe 7 Returning path 8 Slime water supply path 11 Base part 12 Bit shank part 13 Outlet 14 O ring (water stop member)
15 Reflux hole

Claims (4)

  In a drilling device comprising a drilling tube having a bit for excavating the ground at the tip, and a hydraulic hammer provided on the tip side in the drilling tube and giving a striking force to the bit, the drilling tube comprises: An inner pipe is provided, and a driving water supply pipe for supplying driving water to the hydraulic hammer from the ground is provided in the inner pipe, and a space between the driving water supply pipe and the inner pipe is drained from the hydraulic hammer. A drilling hole characterized in that it is a return passage for returning used drive water to the ground, and a slime treated water supply passage for supplying slime treated water to the excavation section is provided between the inner pipe and the outer pipe. apparatus.   The drilling device according to claim 1, wherein the drilling tube, the inner tube, and the driving water supply tube are provided coaxially.   The inner pipe is provided with a pedestal for attaching the rear end of the hydraulic hammer, and the bit shank connecting the hydraulic hammer and the bit has a discharge port for discharging used drive water from the hydraulic hammer into the inner pipe. A water stop member is provided between the bit shank portion and the inner pipe to prevent the driving water from flowing out to the bit side, and the pedestal portion is provided with a return hole for returning the driving water to the ground. The drilling device according to claim 1, wherein the drilling device is provided. The drilling device according to claim 1, 2 or 3, wherein the drilling tube, the inner tube, and the driving water supply tube are configured to be connectable to appropriate lengths.

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