JP2022150870A - Boring device - Google Patents

Abstract

To provide a boring device for boring a hole to a predetermined depth in the ground while extending double pipe tools composed of an inner pipe and an outer pipe, and capable of connecting a new inner pipe on a device side smoothly and stably to an inner pipe of a boring side.SOLUTION: An annular inner guide 62 where a circular opening 62b allowing an inner rod to pass through can be formed in its center is provided on an upper part of a second clamp arranged on a lower part of a leader device for clamping the inner rod. The inner guide 62 is equally divided into a left guide 62L and a right inner guide 62R, and the left guide 62L and the right inner guide 62R can be moved in a horizontal direction by a left cylinder 63L and a right cylinder 63R, respectively. Further, a left taper surface 62La and a right taper surface 62Ra inclined obliquely downward toward the center are formed on an edge part of the opening 62b. And, the opening 62b is set so that its center matches an axial core of an inner end of a rotation driving device.SELECTED DRAWING: Figure 20

Description

The present invention relates to a drilling device. More specifically, in a drilling device that drills the ground to a predetermined depth while adding double-pipe tools consisting of an inner pipe and an outer pipe, a new inner pipe on the device side is smoothly and stably attached to the inner pipe on the drilling side. It relates to a drilling device that can be connected.

Conventionally, as a method of drilling a hole in the ground, a rotary percussion method of drilling while applying a rotational force and a striking force is widely known. Since this rotary percussion method crushes hard rock by impact force, it has the advantage of being able to drill not only sand layers and boulder layers but also bedrock.
Therefore, rotary percussion is used as a drilling method in slope disaster prevention construction technology such as ground anchor work, which is one of landslide prevention work, or horizontal boring work, which is one of landslide prevention work, or as a face stability maintenance method in tunnel construction. It is widely used as a drilling means in the chemical injection method, which is one of the

To briefly explain the drilling process by rotary percussion, first, a double tube tool (or "double tube rod") consisting of an outer casing and an inner rod is connected to a rotary drive device (or swivel head). Then, the ground is drilled while applying an impact force to the double-pipe tools by the rotary drive device and applying a rotational force by the rotary drive device. Then, the hole is drilled to a predetermined depth while compensating for the double pipe tools. Drilling is completed when the double pipe tools reach the target depth.

After drilling is completed, remove all the inner rods. After that, the outer casing is completely removed and the construction is completed.

JP-A-9-78976 JP-A-5-263581 Japanese Utility Model Laid-Open No. 6-20592 JP-A-2000-337074

Until now, in the double-pipe filling process, the connection of the double-pipe tools to the rotary drive device was performed by tilting the leader device (for example, in the ground anchor work of landslide prevention work, the depression angle of the drilling direction by the double-pipe tools was 90°. On the other hand, in the horizontal boring work for landslide control work, the depressing angle of the drilling direction by the double pipe tools is 30°.), the worker manually lifts the double pipe tools and I was doing work to align and connect the shafts of the pipe tools and the rotary drive. The double pipe tools are heavy at least 40kg and have a long total length of at least 1m. There is a danger of being caught in the rotary drive device.

Also, when connecting the double-pipe tools (dual-pipe tools on the drilling side) that have penetrated into the ground to the double-pipe tools attached to the rotary drive device (double-pipe tools on the rotary drive device side), While the operator lowers the inner rod on the side of the rotary drive device using a leader device, the operator performs centering work for the inner rod on the device side with respect to the axial center of the inner rod on the drilling side.

However, since the inner rod on the side of the rotary drive device is long in the longitudinal direction, the axial center of the tip of the inner rod on the side of the device may become dislocated from the drilling side due to the influence of gravity or the bending of the inner rod itself on the device side. There are many cases where the inner rod is largely eccentric with respect to the axis of the inner rod. In the worst case, the inner rod on the device side cannot be aligned with the inner rod on the drilling side, so that the inner rod on the device side cannot be connected to the inner rod on the drilling side.

Thus, in the conventional drilling device that drills the ground to a predetermined depth while adding double pipe tools, it is possible to smoothly and stably connect the inner rod on the rotary drive device side to the inner rod on the drilling side. I have a problem that I can't.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned problems of the prior art. To provide a drilling device capable of smoothly and stably connecting a new inner pipe on the device side to an inner pipe on the drilling side.

A drilling apparatus according to the present invention for achieving the above object is a rotary drilling device that rotates a double pipe (1) consisting of an inner pipe (1a) and an outer pipe (1b) and penetrates at least into the ground, bedrock, or structure. a driving device (40), a leader device (30) for guiding the steel pipe (1) in an arbitrary construction direction while supporting the rotation driving device (40), and an internal a first gripping mechanism (71) for gripping the pipe (1a) and loosening screw fastening between the inner pipes (1a) or between the outer pipes (1b); A second gripping mechanism (72) for gripping the tube (1a), and a third gripping mechanism (73) provided below the second gripping mechanism (72) for gripping the outer tube (1b), A drilling device for drilling ground while successively adding double pipes (1), wherein an inner pipe (1a) and an outer pipe (1b) are selectively placed above the first gripping mechanism (71). A guide mechanism (60) is provided which has an opening (62b) for passage and the edges of the opening (62b) are formed into tapered surfaces (62La, 62Ra) inclined downward toward the center. It is characterized by

In the above configuration, the edge of the opening (62b) tapers (62La, 62Ra) inclined downward toward the center so that the tip of the inner tube (1a) on the side of the rotary drive device smoothly fits into the opening (62b). , it passes through the opening (62b) and connects to the inner pipe (1a) on the drilling side. In addition, since the opening (62b) can selectively pass the outer tube (1b), when connecting the outer tube (1b) on the side of the rotary drive device and the outer tube (1b) on the drilling side, The tip of the outer tube (1b) on the rotation drive side passes through the opening (62b) and smoothly connects to the outer tube (1b) on the drilling side.

A second feature of the drilling device according to the present invention is that the member (62) formed with the tapered surfaces (62La, 62Ra) is divided into two members (62L, 62R), each member (62L, 62R) are configured so as to be able to move horizontally in opposite directions to each other.

In the above configuration, for example, by attaching the members (62L, 62R) having the tapered surfaces (62La, 62Ra) to the tips of the cylinders (63L, 63R) that perform reciprocating motion, the inner tube (1a) and the outer tube (1b) can be selectively passed through.

A third feature of the drilling device according to the present invention is that the center of the opening (62b) coincides with the axial center of the inner end (40a) to which the inner pipe (1a) is connected in the rotary drive device (40). is set to

In the above configuration, the tip of the inner tube (1a) on the device side passes through the opening (62b), so that the axial center of the tip of the inner tube (1a) on the device side is automatically aligned with the inner end (1a) on the device side. 40a).

A fourth feature of the drilling apparatus according to the present invention is that the guide mechanism (60) has an edge portion inclined downward toward the center for guiding the outer tube (1b) to the opening (62b). It has another opening (61a) molded into the tapered surface (61b).

In the above configuration, even if the axial center of the tip of the inner tube (1a) on the device side is greatly eccentric, the tapered surface (61b) of the other opening (61a) allows the inner tube (1a) on the device side to The tip of 1a) is guided to the opening (62b) and smoothly guided to the inner tube (1a) on the drilling side. Similarly, the tip of the device-side outer tube (1b) is smoothly guided to the drilling-side outer tube (1b) by the tapered surface (61b) of the other opening (61a).

A fifth feature of the drilling device according to the present invention is that the center of the other opening (61a) is the axial center of the outer end (40b) to which the outer pipe (1b) is connected in the rotary drive device (40). is set to match

In the above configuration, the tip of the device-side outer tube (1b) passes through the other opening (61a), so that the axial center of the tip of the device-side outer tube (1b) automatically aligns with the device-side outer tube. It will be adjusted to the axial center of the end (40b).

A sixth feature of the drilling device according to the present invention is that the rotary drive device (40) has an impact device for applying impact force to the double pipe (1).

With the configuration described above, the present invention can also be applied to a rotary percussion device.

A seventh feature of the drilling device according to the present invention is that an axial center adjusting device (20) for adjusting the axial center of the double pipe (1) in a predetermined direction is arranged next to the leader device (30). A double pipe stock device (10) for storing the double pipe (1) is provided in parallel next to the shaft center adjustment device (20), and the double pipe stock device (10) and the shaft The core adjustment device (20) is configured to be raised and lowered in conjunction with the leader device (30).

The eighth feature of the drilling apparatus according to the present invention is that the double pipe stock device (10) has transfer means (11) for transferring the double pipe (1) to the axial center adjustment device (20). While the shaft center adjusting device (20) allows the double pipe (1) to pass through to the double pipe stock device (10) side, gripping mechanisms (22, 23U, 23L) that always form a wide opening, and turning mechanisms (26, 27) that turn the double tube (1) whose axis is adjusted to the side of the reader device (30). , the reader device (30) comprises a slide mechanism (32) for laterally moving the rotary drive device (40).

In the above configuration, even if the construction angle of the leader device (30) is oblique, the double pipe stock device (10) receives the double pipe (1) and places the received double pipe (1) on the axis. It can now be transferred to the conditioning device (20). Further, the axial center adjusting device (20) can position the double tube (1) with the axial center adjusted on the axial center of the rotary drive device (40), and the reader device (30) has the axial center adjusted. The double pipe (1) on the drilling side can be connected to the rotary drive device (40) to add to the double pipe (1) on the drilling side.

According to the drilling device according to the present invention, in the drilling device for drilling the ground to a predetermined depth while adding the double-pipe tool consisting of the inner pipe and the outer pipe, the new inner pipe on the drilling side is attached to the inner pipe on the drilling side. It becomes possible to connect pipes smoothly and stably.

It is an explanatory view showing a drilling device concerning one embodiment of the present invention. It is an explanatory view showing a rod stocker and a rod changer concerning the present invention. It is explanatory drawing which shows the raising/lowering structure of the rod stocker which concerns on this invention. FIG. 4 is an explanatory diagram showing a gripping mechanism of the rod changer according to the present invention; FIG. 4 is an explanatory diagram showing a structure for adjusting the axial center of the inner rod of the rod changer according to the present invention; It is explanatory drawing which shows the connection structure of a rotation drive and an outer casing. It is a flowchart which shows a series of rod exchange processes after a double tube rod is mounted on a rod stocker until it is connected to a rotation drive. It is explanatory drawing which shows the state which set the double tube|pipe rod to the rod stocker. It is explanatory drawing which shows the state which made the rod stocker stand up to the predetermined position. FIG. 4 is an explanatory view showing a state in which an outer casing is held by upper and lower outer clamps; FIG. 4 is an explanatory diagram showing axial center adjustment of an inner rod; FIG. 5 is an explanatory view showing a state in which a turning bracket of a rod changer is turned from the rod stocker side to the leader device side; It is explanatory drawing which shows the state which opened the inner guide and slid the rotation drive to the rod changer side. FIG. 4 is an explanatory view showing the connection between the inner end of the rotary drive device and the inner rod of the double tube rod; FIG. 5 is an explanatory view showing a state in which the outer casing is lifted while the outer casing is held by upper and lower outer clamps; FIG. 4 is an explanatory view showing the connection between the outer end of the rotary drive device and the outer casing of the double tube rod; It is an explanatory view showing a V-shaped roller taper mechanism attached to the tip of an upper outer clamp cylinder. FIG. 4 is an explanatory view showing the drilling device in the vicinity of the centralizer with the inner guide closed according to the present invention; FIG. 4 is an explanatory view showing the drilling device in the vicinity of the centralizer with the inner guide opened according to the present invention; FIG. 5 is an explanatory diagram showing a cross section of the main part of the centralizer when the inner guide according to the present invention is closed; FIG. 4 is an explanatory diagram showing a cross-section of a main part of the centralizer when the inner guide according to the present invention is opened; FIG. 5 is an explanatory view showing the function of guiding the inner rod to the opening (sassoi) by the centralizer according to the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram showing a drilling device 100 according to one embodiment of the present invention. For convenience of explanation, FIG. 1 shows a state in which the reader device 30 is standing.

This drilling device 100 is capable of adjusting the axial center of the double-pipe rod 1 while maintaining the inclination angle of the leader device 30 at any installation angle of the double-pipe rod 1, and connection to and disconnection from the rotary drive device 40 can be performed automatically.

Therefore, this drilling device 100 includes a rod stocker 10 for storing the double-tube rods 1, and a rotation drive device 40 for centering the double-tube rods 1 and transferring the centered double-tube rods 1 to each other. A rod changer 20 positioned on the core (on the axis), a leader device 30 that raises and lowers the rotary drive device 40 along a predetermined direction, and a double tube rod 1 attached to the rotary drive device 40 with a rotational force, A rotary drive device 40 that provides feeding force and impact force, a structure 50 to which each element is attached, and a centralizer that positions the axis of the double tube rod 1 attached to the rotary drive device 40 so that it falls within a predetermined range. 60.

Here, "centering" means "positioning the double tube rod 1 so that the axial center of the double tube rod 1 is within a predetermined range". Also, the double tube rod 1 used in this embodiment is a double tube tool consisting of an outer casing 1b and an inner rod 1a (FIG. 4) placed in the outer casing 1b in a free state. Further, the rod stocker 10 will be described in detail with reference to FIGS. 2 and 3. FIG. The rod changer 20 will be described in detail with reference to FIGS. 2, 4 and 5. FIG.

Incidentally, the rod stocker 10 is integrated with the rod changer 20 through the support bracket 18 and the rod changer support 29 so as to be freely raised and lowered by the hydraulic cylinder 19 . The rod changer 20 is integrated with the leader device 30 by an upper connecting member 28U and a lower connecting member 28L. The reader device 30 is attached to the structure 50 so that it can be raised and lowered. Therefore, in this embodiment, the rod stocker 10 is integrated with the leader device 30 via the rod changer 20 . The rod changer 20 is integrated directly into the leader device 30 . That is, the rod stocker 10 and the rod changer 20 are configured to be raised and lowered in conjunction with the leader device 30 . Each configuration will be described below.

The leader device 30 vertically moves the rotation drive device 40 by the chain 31 . The chain 31 is wound between driving sprockets (not shown) and driven sprockets (not shown) provided at both ends of the leader device 30 and driven to rotate by a chain hydraulic motor 33 . Further, a head slide mechanism 32 is provided for offsetting the rotary drive device 40 in the lateral direction on the rod changer 20 side.

The leader device 30 is configured to be erectable and tiltable in the front-rear direction about a front-rear reader fulcrum (not shown) by a tilting cylinder (not shown).

The rotary drive device 40 includes an inner end 40a connected to the inner rod 1a of the double pipe rod 1, an outer end 40b connected to the outer casing 1b of the double pipe rod 1, and two hydraulic motors for rotating the double pipe rod 1. 40c, 40c, and a hydraulic impact device 40d that applies impact force to the double tube rod 1. - 特許庁

FIG. 2 is an explanatory diagram showing the rod stocker 10 and rod changer 20 according to the present invention.
As shown in FIG. 2, the rod stocker 10 includes transfer chains 11, 11, a hydraulic motor 12 for driving the transfer chains 11, 11, and a dual-purpose motor provided on the transfer chains 11, 11 for transfer. stopper pins 13, 13 for preventing dropout of the tube rod 1; a back frame 14 for pushing the double tube rod 1 from behind in the transfer direction; A lower tube support bracket 15L that supports the lower part of the side surface of the heavy tube rod 1, an upper movement restriction plate 16U that restricts upward movement of the double tube rod 1 in the longitudinal direction, and a downward movement of the double tube rod 1 in the longitudinal direction. a lower movement regulating plate 16L for regulating the movement, a column 17 to which each element is attached, a column bracket 18 that supports the column 17 so that it can be tilted (swinged) and a hydraulic cylinder 19, and a column 17 that can be tilted and a hydraulic cylinder 19 for

The strut 17 is arranged parallel to the swivel bracket 26 of the rod changer 20 and attached to the support bracket 18 so as to be able to rise and fall (swing). Rotating shafts 12a and 12b are arranged on both sides of the column 17 in parallel with each other. Drive sprockets 12c are arranged at both ends of the outer rotating shaft 12a, and driven sprockets 12d are arranged at both ends of the inner rotating shaft 12b. The transfer chain 11 straddles the strut 17 and is wound around the drive sprocket 12c and the driven sprocket 12d. As a result, an endless chain type transferring means for transferring the double tube rod 1 to the rod changer 20 is constructed on the column 17 .

Also, the hydraulic motor 12 and the hydraulic cylinder 19 are arranged outside the column 17 . Furthermore, by arranging the clamps 22, 23U, and 23L of the rod changer 20, which are always formed with openings through which the double tube rod 1 can pass, at positions that do not interfere with the transfer chain 11 and the rotating shaft 12b of the rod stocker 10, The distance between the rod stocker 10 and the rod changer 20 can be shortened. As a result, the double tube rod 1 can be smoothly transferred to the clamps 22, 23U, 23L of the rod changer 20 by the transfer chains 11, 11.

The upper and lower tube support brackets 15U and 15L are provided with projections 15U1 and 15L1 projecting upward at the ends opposite to the rod changer 20 side, respectively. The protrusions 15U1 and 15L1 can prevent the double tube rod 1 from falling off the upper and lower tube support brackets 15U and 15L when the rod stocker 10 is placed horizontally.

The upper movement restricting plate 16U and the lower movement restricting plate 16L have bent portions 16U1 and 16L1, respectively. This makes it possible to prevent the double-tube rod 1 from separating from the support 17 when the support 17 supporting the double-tube rod 1 is vertical or inclined.

Therefore, when the double tube rod 1 is placed on the upper tube support bracket 15U and the lower tube support bracket 15L, the transfer chains 11, 11 move the double tube rod 1 to a predetermined position. This "predetermined position" means a position where the double pipe rod 1 does not drop off from the rod stocker 10 even when the rod stocker 10 takes an arbitrary inclination angle. It means a position where both ends of the rod 1 are aligned with the lower sides of the upper and lower bent portions 16U1 and 16L1. In this case, the double-tube rod 1 is restrained in the axial direction (longitudinal direction) by the vertical movement restricting plates 16U and 16L, and in the radial direction (lateral direction) by the stopper pins 13, 13 and the back frame 14. ing. Further, the out-of-plane direction of the double tube rod 1 is restrained by the upper and lower bent portions 16U1 and 16L1.

Further, the movement amount of the transfer chain 11 is configured to be detected by an encoder (not shown) attached to the rotating shaft 12 a of the hydraulic motor 12 . Therefore, whether or not the double tube rod 1 has reached the "predetermined position" is detected by this encoder.

3A and 3B are explanatory diagrams showing the tilting structure of the rod stocker 10 according to the present invention.
The rod stocker 10 maintains the inclination angle of the leader device 30 regardless of the construction angle of the double pipe rod 1 (the inclination angle of the leader device 30) by the erection structure using the hydraulic cylinder 19. In this state, it is possible to receive a new double-tube rod 1 and return the tilt angle of the post 17 to the tilt angle of the leader device 30 (rod changer 20) after receiving it. As a result, regardless of the installation angle of the double-pipe rod 1 (inclination angle of the leader device 30), the subsequent centering of the double-pipe rod 1 can be performed, and the centering of the double-pipe rod 1 has been completed. It becomes possible to connect the rod 1 to the rotary drive 40 . The term "centering of the double tube rod 1" as used herein means the positioning of both the inner "positioning of the axis of the inner rod 1a" and the outer "positioning of the axis of the outer casing 1b". is doing.

A vertical rib plate 17a is provided on the lower side of the rear portion of the post 17 (in the vicinity of the lower movement restricting plate 16L). The vertical rib plate 17a is provided with a connecting pin 17b that integrates the column 17 with the column bracket 18 so as to be able to swing. On the other hand, the support bracket 18 is provided with a recess 18a into which the vertical rib plate 17a is fitted. When the hydraulic cylinder 19 is operated, the vertical rib plate 17a is fitted into the concave portion 18a to prevent the strut 17 from laterally swinging. As a result, the strut 17 on which the double tube rod 1 is placed can be stably raised.

The hydraulic cylinder 19 has a rod 19a attached to the vertical rib plate 17a by a rod connecting pin 19c so as to be able to swing. On the other hand, the cylinder body 19b is swingably attached to the column bracket 18 by a body connection pin 19d. Therefore, when the rod 19a of the hydraulic cylinder 19 is extended, the column 17 swings (stands up) upward in the drawing with the connecting pin 17b as a fulcrum. On the other hand, when the rod 19a of the hydraulic cylinder 19 contracts, the strut 17 swings (tilts) vertically with the connecting pin 17b as a fulcrum. Therefore, when the rod stocker 10 receives the double tube rod 1, the hydraulic cylinder 19 contracts the rod 19a. On the other hand, when the rod stocker 10 transfers the double tube rod 1 to the inclined rod changer 20, the hydraulic cylinder 19 extends the rod 19a.

Returning again to FIG. An upper outer clamp 23U that grips the upper side surface of the outer casing 1b, a lower outer clamp 23L that grips the lower side surface of the outer casing 1b, a clamp slide mechanism 24 that moves the lower outer clamp 23L up and down along the longitudinal direction of the swivel bracket 26, An inner centering cylinder 25 for centering the inner rod 1a, a turning bracket 26 for moving the centered double tube rod 1 onto the axis of the rotary drive device 40, and a turning for turning the turning bracket 26. an actuator 27, an upper connecting member 28U and a lower connecting member 28L that integrate the swivel bracket 26 with the reader device 30, and a rod changer column 29 for supporting the rod stocker 10. The inner guide 21, inner clamp 22 and upper/lower outer clamps 23U and 23L will be described later with reference to FIG.

The rod changer strut 29 supports the upper connecting member 28U and the lower connecting member 28L. A swivel bracket 26 is rotatably attached between the upper connecting member 28U and the lower connecting member 28L. The inner guide 21, the inner clamp 22, the upper and lower outer clamps 23U and 23L, the clamp slide mechanism 24, and the inner centering cylinder 25 are integrated with the swivel bracket 26 via a predetermined bracket. Also, the turning bracket 26 is turned by a turning actuator 27 .

FIG. 4 is an explanatory diagram showing the gripping mechanism of the rod changer 20 according to the present invention. 4 shows the essential parts of the rod changer 20 when the swivel bracket 26 swivels toward the leader device 30. As shown in FIG.

The inner guide 21 is configured such that an upper arm 21c and a lower arm 21d can each swing. Therefore, when the inner guide 21 opens, the outer casing 1b of the double tube rod 1 can pass through the inner guide 21. As shown in FIG. On the other hand, when the inner guide 21 is closed, a through hole 21b (FIG. 5) is formed in the center. Therefore, only the inner rod 1a of the double tube rod 1 can pass through.

When the inner guide 21 is closed, the inner rod 1a is pushed by the inner centering cylinder 25 and passed through the through hole 21b (FIG. 5). The hole center of the through hole 21b passes through a predetermined range (tolerance range) about the axial center of the inner end 40a of the rotary drive device 40 when it is rotated by a predetermined angle with the rotating bracket 26 as a fulcrum. It is preset as Therefore, by passing the inner rod 1a through the through hole 21b formed in the center of the semi-conical shape (tapered surface 21a), the axial center of the inner rod 1a is aligned with the axial center of the inner end 40a of the rotary drive device 40. It passes within the specified range (within the tolerance range).

In addition, when the inner guide 21 is closed, the inner peripheral surface forms a semi-conical tapered surface 21a (Fig. 5). When the cylinder 25 pushes the rear end of the inner rod 1a, the front end of the inner rod 1a is smoothly guided to the through hole 21b (FIG. 5).

On the inner peripheral surface of the inner clamp 22 (the surface facing the side surface of the inner rod 1a), cylinders 22b, 22b having a V-shaped taper mechanism 22a (FIG. 5) attached to their ends are arranged vertically point symmetrically. . Therefore, when the cylinders 22b, 22b grip the inner rod 1a from above and below, the axial center of the inner rod 1a is positioned at a predetermined position. The "predetermined position" means that when the shaft center of the inner rod 1a is rotated by a predetermined angle with the swing bracket 26 as a fulcrum, the shaft center of the inner rod 1a is aligned with the inner end 40a of the rotary drive device 40. It is a position that passes through a predetermined range (within a tolerance range) centered on the axis.

The upper and lower clamp arms 22c, 22d of the inner clamp 22 are not movable and are always fixed. As a result, an opening through which the double tube rod 1 (outer casing 1b) can pass is always formed on the rod stocker 10 side of the inner clamp 22 .

In addition, upper outer clamp cylinders 23Ub, 23Ub having a V-shaped roller taper mechanism 23Ua (FIG. 17) attached to their tips are mounted on the inner peripheral surface of the upper outer clamp 23U (the surface facing the side surface of the outer casing 1b). They are arranged symmetrically. Therefore, when the upper outer clamp cylinders 23Ub, 23Ub grip the outer casing 1b from above and below, the axial center of the outer casing 1b is positioned at a predetermined position. The "predetermined position" means that when the shaft center of the outer casing 1b is rotated by a predetermined angle with the turning bracket 26 as a fulcrum, the shaft center of the outer casing 1b is aligned with the outer end 40b of the rotary drive device 40. It is a position that passes through a predetermined range (within a tolerance range) centered on the axis. Further, the V-shaped roller taper mechanism 23Ua allows the outer casing 1b to move relative to the upper outer clamp 23U along the axial direction (longitudinal direction) while maintaining the axial position.

The upper and lower clamp arms 23Uc, 23Ud of the upper outer clamp 23U are not movable and are always fixed. As a result, an opening through which the double tube rod 1 (outer casing 1b) can pass is always formed on the rod stocker 10 side of the upper outer clamp 23U.

On the other hand, on the inner peripheral surface of the lower outer clamp 23L (the surface facing the side surface of the outer casing 1b), lower outer clamp cylinders 23Lb, 23Lb having a V-shaped taper mechanism 23La attached to their tips are arranged vertically point symmetrically. ing. Therefore, when the lower outer clamp cylinders 23Lb, 23Lb grip the outer casing 1b from above and below, the axial center of the outer casing 1b is positioned at a predetermined position. The "predetermined position" means that when the shaft center of the outer casing 1b is rotated by a predetermined angle with the turning bracket 26 as a fulcrum, the shaft center of the outer casing 1b is aligned with the outer end 40b of the rotary drive device 40. It is a position that passes through a predetermined range (within a tolerance range) centered on the axis.

The upper and lower clamp arms 23Lc, 23Ld of the lower outer clamp 23L are not movable and are always fixed. As a result, the lower outer clamp 23L always has an opening on the rod stocker 10 side through which the double tube rod 1 (outer casing 1b) can pass.

In this manner, the lower outer clamp 23L and the upper outer clamp 23U grip the outer casing 1b, thereby completing the centering of the outer casing 1b.

Further, although the details will be described later with reference to FIG. 15 , the lower outer clamp 23</b>L is configured to be movable along the axial direction (longitudinal direction) of the swivel bracket 26 by the clamp slide mechanism 24 . As a result, the outer casing 1b can be brought closer to the rotary drive device 40 while the upper outer clamp 23U and the lower outer clamp 23L grip the outer casing 1b, that is, while the axial position of the outer casing 1b is held. Become. As a result, when connecting the outer casing 1b of the double tube rod 1 to the rotary drive device 40, it is not necessary to lower/raise the rotary drive device 40. FIG. This makes it possible to minimize the number of times the rotary drive device 40 moves up and down during the connection work between the double tube rod 1 and the rotary drive device 40 .

FIG. 5 is an explanatory view showing the axial center adjustment structure for the inner rod of the rod changer according to the present invention.
The tip of the rod 25a of the inner centering cylinder 25 has a conical cone shape 25b whose outer peripheral surface is tapered toward the inner guide 21. As shown in FIG. On the other hand, the inner guide 21 has a semi-conical tapered surface 21a whose inner peripheral surface is tapered toward the center, and a through hole 21b formed in the center of the tapered surface 21a. Since the inner guide 21 is divided into two, the tapered surface 21a and the through hole 21b are also divided into two.

First, the inner rod 1a of the double tube rod 1 is brought into contact with the tapered surface 21a of the inner guide 21 by the inner centering cylinder 25 through the outer casing 1b. The tip of the inner rod 1a is guided to the through hole 21b by the tapered surface 21a of the inner guide 21, and is fitted into the through hole 21b so that the tip is axially aligned. Next, by extending the rod 25a of the inner centering cylinder 25 to the stroke end, the cone shape 25b at the tip of the rod 25a fits into the rear end of the inner rod 1a. As a result, the rear end is also aligned, and the centering of the inner rod 1a is completed. By gripping the inner rod 1a in that state with the inner clamp 22, the centered state of the inner rod 1a is maintained.

FIG. 6 is an explanatory diagram showing a state in which the outer casing 1b is approached to be connected to the rotary drive device 40 while the axial center position of the outer casing 1b is held. Note that the inner guide 21 and the inner clamp 22 are in an open state.

As shown in FIG. 6, the head slide mechanism 32 slides the rotary drive device 40 in the lateral direction. After that, the clamp slide mechanism 24 slides the lower outer clamp 23L upward, and the outer casing 1b is moved upward to a predetermined position while its axial center is held. After that, the leader device 30 lowers the rotary drive device 40 to connect the outer end 40b of the rotary drive device 40 and the outer casing 1b. By moving the lower outer clamp 23L using the clamp slide mechanism 24 in this manner, the number of moving steps of the rotary drive device 40 is reduced, so that the connection work between the rotary drive device 40 and the outer casing 1b can be efficiently performed. will be able to A series of processes from mounting the double tube rod 1 on the rod stocker 10 to connecting it to the rotary drive device 40 will be described below.

FIG. 7 is a flow chart showing a series of rod replacement processes from when the double tube rod 1 is placed on the rod stocker 10 to when it is connected to the rotary drive device 40 .

First, in process P1, the double tube rod 1 is set in the rod stocker 10 as shown in FIG. The setting of the double tube rod 1 is performed using a lifting and turning device such as a crane. In this case, the column 17 of the rod stocker 10 is moved from the inclined state to the horizontal state by the hydraulic cylinder 19 . The inclination angle of the strut 17 of the rod stocker 10 can be calculated based on the stroke amount of the hydraulic cylinder 19 .

After that, the double tube rod 1 is transferred by the transfer chain 11 to the positions of the upper and lower bent portions 16U1 and 16L1. As a result, the double tube rod 1 is stably supported by the upper and lower bent portions 16U1 and 16L1, the strut 17, the stopper pins 13 and 13 and the back frame 14 without falling off. The transfer amount of the double tube rod 1 can be calculated based on the rotation amount of an encoder (not shown) attached to the hydraulic motor 12, for example.

Next, in process P2, as shown in FIG. 9, the double tube rod 1 is erected to a predetermined position. The post 17 of the rod stocker 10 is erected by the hydraulic cylinder 19 to a position parallel to the revolving bracket 26 of the rod changer 20 . After that, the transfer chain 11 is used to transfer the double tube rod 1 to the rod changer 20 . The outer casing 1b of the double tube rod 1 is fitted to the inner peripheral surfaces of the upper and lower outer clamps 23U and 23L.

Next, in process P3, as shown in FIG. 10, the outer rod 1b is centered. By gripping the outer casing 1b with the upper and lower outer clamps 23U and 23L, the outer casing 1b is automatically centered.

Next, in process P4, as shown in FIG. 11, the inner rod 1a is centered. First, the rod 25a of the inner centering cylinder 25 having the male cone shape 25b attached to the tip is engaged with the rear end of the hollow cylindrical inner rod 1a (FIG. 11(a)). By extending the rod 25a, the inner rod 1a is pushed out toward the inner guide 21 while being in contact with the inner peripheral surface of the outer casing 1b.

As the rod 25a further extends, the tip of the inner rod 1a comes into contact with the tapered surface 21a of the inner guide 21, is guided by the tapered surface 21a, and fits into the through hole 21b. Further extension of the rod 25a causes the cone-shaped portion 25b of the rod 25a to fit into the rear end of the inner rod 1a (FIG. 11(b)). As a result, the inner rod 1a is centered. In this case, the inner rod 1a is blocked by the upper and lower arms 21c and 21d of the inner guide 21 and cannot pass through the through hole 21b. That is, the inner rod 1a has its rear end urged by the rod 25a of the inner centering cylinder 25 and its front end blocked by the upper and lower arms 21c and 21d of the inner guide 21. As shown in FIG.

By gripping from above and below with the cylinders 22b, 22b of the inner clamp 22, the axial center position of the inner rod 1a is held.

Next, in process P5, as shown in FIG. 12, the rotary drive device 40 is raised to a predetermined position.

Next, in process P6, the inner guide 21, inner clamp 22 and upper/lower outer clamps 23U, L are turned from the rod stocker 10 side to the leader side 30 as shown in FIG.

Next, in process P7, as shown in FIG. 13, the inner guide 21 is opened.

Next, in process P8, as shown in FIG. 13, the rotary drive device 40 is slid toward the rod changer 20 side. As a result, the axes of the inner rod 1a and the outer casing 1b of the double tube rod 1 are positioned on the axes of the inner end 40a and the outer end 40b of the rotary drive device 40, respectively.

Next, in process P9, as shown in FIG. 14, the inner end 40a of the rotary drive device 40 is connected to the inner rod 1a. When the rotary drive device 40 descends, the female thread (not shown) of the inner end 40a of the rotary drive device 40 is screwed to the male thread (not shown) of the inner rod 1a, thereby connecting the rotary drive device 40 and the inner rod. 1a is connected.

Next, in process P10, the inner clamp 22 is opened as shown in FIG. The gripping from the vertical direction by the cylinders 22b, 22b is released.

Next, in process P11, as shown in FIG. 14, the inner centering cylinder 25 is retracted.

Next, in process P12, as shown in FIG. 15, the clamp slide mechanism 24 raises the outer casing 1b gripped by the lower outer clamp 23L.

Next, in process P13, the outer casing 1b is connected to the outer end 40b of the rotary drive device 40, as shown in FIG. The rotary drive device 40 is lowered and the male thread (not shown) of the outer end 40b is screwed to the female thread (not shown) of the outer casing 1b, thereby connecting the rotary drive device 40 and the outer casing 1b. . This completes the connection between the double tube rod 1 and the rotary drive device 40 .

Next, in process P14, as shown in FIG. 16, the upper outer clamp 23U and the lower outer clamp 23L are opened. Gripping from the vertical direction by the upper outer clamp cylinders 23Ub, 23Ub is released. Also, the grip from the vertical direction by the lower outer clamp cylinders 23Lb, 23Lb is released.

Next, in process P15, as shown in FIG. 16, the head slide mechanism 32 returns the rotary drive device 40 to which the double tube rod 1 is connected to the leader device 30 side.

As described above, according to the drilling apparatus 100 of the present invention, the axial center adjustment of the double-pipe rod 1 and the It is possible to automatically connect and disconnect the tube rod 1 to and from the rotary drive 40 .

FIG. 17 is an explanatory diagram showing the V-shaped roller taper mechanism 23Ua attached to the tip of the upper outer clamp cylinder 23Ub according to the present invention. FIG. 17(a) is a cross-sectional view of the upper outer clamp 23U, and FIG. 17(b) is a perspective view of the V-shaped roller taper mechanism 23Ua.

As shown in FIG. 17(a), V-shaped roller taper mechanisms 23Ua, in which inclined rollers are symmetrically folded back in the horizontal direction, are vertically arranged point-symmetrically. Therefore, when the outer casing 1b is gripped from above and below by the V-shaped roller taper mechanisms 23Ua, 23Ua, the position of the axis C1b of the outer casing 1b is positioned at a predetermined position formed by the V-shaped roller taper mechanisms 23Ua, 23Ua. will be The "predetermined position" is the intersection of "a line segment connecting the upper contact point P1 and the lower contact point P2" and "a line segment connecting the upper contact point P2 and the lower contact point P1".

In the inner clamp 22, the axial center of the inner rod 1a is positioned at a predetermined position formed by V-shaped taper mechanisms 22a, 22a formed by symmetrically folding inclined rough surface plates in the horizontal direction. Similarly, the lower outer clamp 23L is such that the axial center C1b of the outer casing 1b is positioned at a predetermined position formed by V-shaped taper mechanisms 23La, 23La formed by symmetrically folding inclined rough surface plates in the lateral direction. Become.

18 to 21 are explanatory diagrams showing the centralizer 60 according to the present invention. 18 shows the drilling device 100 near the centralizer 60 with the inner guide 62 closed, and FIG. 19 shows the drilling device 100 near the centralizer 60 with the inner guide 62 open. there is FIG. 20 shows a cross section of the main part of the centralizer 60 when the inner guide 62 is closed. FIG. 21 shows a cross section of the main part of the centralizer 60 when the inner guide 62 is opened. 18 and 19, a part of the centralizer 60 is shown in sectional view.

The centralizer 60 is a centering device that positions the axial center of the tip of the double-tube rod 1 attached to the rotation driving device 40, which is connected to the double-tube rod 1 on the drilling side, within a predetermined range. is. The "predetermined range" referred to here is the axial center of the inner end 40a of the rotary drive device 40 for the inner rod 1a of the double tube rod 1, and the outer end 40b of the rotary drive device 40 for the outer casing 1b. It is the axis.

The centralizer 60 is fixed by bolts 65, for example, to the upper surface of a first clamp 71 provided at the bottom of the reader device 30. As shown in FIG. The first clamp 71 has, in addition to the gripping mechanism, a rotation mechanism that rotates the screw fastening portion between the inner rods 1a, 1a or the outer casings 1b, 1b by about 40°. Therefore, the first clamp 71 is used when it is difficult to loosen the screw-fastened inner rods 1a, 1a or the outer casings 1b, 1b only with the rotational force (torque) of the rotary drive device 40. FIG.

The second clamp 72 is a gripping mechanism for clamping the inner rod 1a, and the third clamp 73 is a gripping mechanism for clamping the outer casing 1b.

As for the configuration of the centralizer 60, the axis of the tip of the outer casing 1b attached to the rotation drive device 40 is aligned with the axis of the outer end 40b of the rotation drive device 40 (the axis of the outer casing 1b on the drilling side). The outer guide 61 positioned so as to match and the axial center of the tip of the inner rod 1a attached to the rotary drive device 40 side are aligned with the axial center of the inner end 40a of the rotary drive device 40 (the axial center of the inner rod 1a on the drilling side). A left inner guide 62L and a right inner guide 62R positioned so as to coincide with the axis), a left cylinder 63L horizontally moving the left inner guide 62L, and a right cylinder 63R horizontally moving the right inner guide 62R. , and a housing bracket 64 that horizontally movably houses the left and right inner guides 62L, 62R. Each configuration will be further described below.

As shown in FIG. 20, the outer guide 61 is an annular body having a circular opening 61b formed in the center for the outer casing 1b to pass through, and is attached to the upper portion of the housing bracket 64. As shown in FIG. The housing bracket 64 has, for example, a bottomless hollow box shape with an open top. The upper opening 64a has an inner diameter through which the outer casing 1b can pass.

The outer peripheral edge of the outer guide 61 forms a tapered surface 61a that is inclined downward toward the center. The tapered surface 61a functions to smoothly guide the tip of the outer casing 1b on the side of the rotary drive device 40 to the opening 61b.

Further, the center (hole center) of the opening 61b is set at a position coinciding with the axial center of the outer end 40b of the rotary drive device 40. As shown in FIG. Furthermore, the inner diameter ΦA of the opening 61b is set to be slightly larger than the maximum outer diameter of the outer casing 1b.

Therefore, when the axial center of the outer casing 1b on the drilling side coincides with the axial center of the outer end 40b of the rotary drive device 40, the outer casing 1b on the rotary drive device 40 side can be rotated by passing through the opening 61b. Centering of the outer casing 1b on the driving device 40 side and the outer casing 1b on the drilling side is automatically performed.

Below the outer guide 61, an inner guide 62 is provided for positioning the axial center of the tip of the inner rod 1a attached to the rotary drive device 40. As shown in FIG. The inner guide 62 is composed of a left inner guide 62L and a right inner guide 62R corresponding to one semi-annular body when the annular body is divided into two halves. Therefore, the shape where the left inner guide 62L and the right inner guide 62R are joined forms an annular body with a circular opening 62b formed in the center for passing the inner rod 1a, like the outer guide 61 does.

An upper peripheral edge portion of the left inner guide 62L forms a left tapered surface 62La inclined obliquely downward toward the center of the opening 62b. Similarly, the upper outer peripheral edge of the right inner guide 62R forms a right tapered surface 62Ra inclined downward toward the center of the opening 62b. These left and right tapered surfaces 62La, 62Ra function to smoothly guide the tip of the inner rod 1a of the rotary drive device 40 side into the opening 62b.

The center (hole center) of the opening 62b is set at a position that coincides with the axial center of the inner end 40a of the rotary drive device 40. As shown in FIG. Furthermore, the inner diameter ΦB of the opening 62b is set to be slightly larger than the maximum outer diameter of the inner rod 1a.

Therefore, when the axial center of the inner rod 1a on the drilling side coincides with the axial center of the inner end 40a of the rotary drive device 40, the inner rod 1a on the rotary drive device 40 side can be rotated by passing through the opening 62b. The inner rod 1a on the drive device 40 side and the inner rod 1a on the drilling side are automatically aligned.

Also, the left inner guide 62L is configured to be horizontally movable within the housing bracket 64 by a left cylinder 63L. Similarly, the right inner guide 62R is also configured to be horizontally movable within the accommodation bracket 64 by means of a right cylinder 63R.

Therefore, as shown in FIG. 21, when the outer casing 1b passes through the opening 61b of the outer guide 61, the left inner guide 62L and the right inner guide 62R move to the left and right sides of the drawing, respectively. Do not obstruct the passage of the casing 1b.

The left and right cylinders 63L and 63R can be configured by, for example, hydraulic cylinders, but can also be configured by electric cylinders. The function of the centralizer 60 to guide the inner rod 1a to the opening 62b will be described below.

FIG. 22 is an explanatory view showing the function of the centralizer 60 to guide the inner rod 1a to the opening 62b. For convenience of explanation, the axis passing through the center of the opening 62b when the inner guide is closed will be referred to as the "reference axis".

As shown in FIG. 22(a), when the axis of the inner rod 1a is largely eccentric from the reference axis and comes into contact with the tapered surface 61a of the outer guide 61, the tapered surface 61a moves the inner rod 1a toward the center of the opening 61b. is induced to

As shown in FIG. 22(b), the inner rod 1a drops from the outer guide 61 onto the upper surface 62c of the inner guide 62. As shown in FIG.

As shown in FIG. 22(c), the inner rod 1a is moved from the upper surface 62c to the left and right tapered surfaces 62La, 62Ra by the feeding force of the leader device 30. As shown in FIG.

As shown in FIG. 22(d), the left and right tapered surfaces 62La and 62Ra are inclined downward toward the center. When the part is smoothly guided to the opening 62b and passes through the opening 62b, it is automatically aligned with the axial center of the inner rod 1a on the drilling side.

As described above, even when the axis of the tip of the inner rod 1a on the rotary drive device side is largely eccentric from the reference axis on the drilling side, the tapered surface 61a of the outer guide 61 allows the inner guide 62 to move. It is guided to the left and right tapered surfaces 62La, 62Ra. The tip of the inner rod 1a on the device side is guided to the opening 62b by the left and right tapered surfaces 62La and 62Ra, and smoothly aligned with the reference axis on the drilling side by passing through the opening 62b.

By the way, in the case where the inner rod 1a on the drilling side protrudes from the upper surface 62c of the inner guide, when the axial center of the inner rod 1a on the drilling side is positioned to the axial center of the inner end 40a on the rotary drive device side, By closing the left and right inner guides 62L, 62R and closing the first clamp 71 or the second clamp 72, the axial center of the inner rod 1a on the drilling side is positioned to the axial center of the inner end 40a on the rotary drive device side. becomes possible.

Although the drilling apparatus 100 that is one embodiment of the present invention has been described above with reference to the drawings, the embodiments of the present invention are not limited to the above. That is, various modifications and changes are possible within the technical scope of the present invention. For example, it is possible to separately provide a tilting cylinder for tilting the rod changer 20 and to link the rod changer 20 with the leader device 30 by the tilting cylinder.

It is also possible to use an electric motor instead of the hydraulic motor 12 for rotating the transfer chain 11 of the rod stocker 10 . Similarly, it is also possible to use an electric cylinder for the hydraulic cylinder 19 that raises and lowers the column 17 .

Also, the type of actuator used in the rod changer 20 may be either electric or hydraulic.

It is also possible to omit the hydraulic impact device 40d.

Further, in the present invention, the construction direction (construction angle) of the double pipe rod 1 can be vertically downward, vertically obliquely downward, vertically upward, or vertically obliquely upward. That is, the angle θ between the object to be drilled and the drilling direction can be arbitrarily set within the range of 0° to 360°.

1 double pipe rod (steel pipe)
1a inner rod 1b outer casing 10 rod stocker (steel pipe stock device)
11 transfer chain (transfer means, endless power transmission means)
12 hydraulic motor (motor)
12a rotating shaft 12b rotating shaft 13 stopper pin (stopper member)
14 back frame (push member)
15U Upper tube support bracket 15U1 Projection 15L Lower tube support bracket 15L1 Projection 16U Upper movement restriction plate 16U1 Upper bent portion 16L Lower movement restriction plate 16L1 Lower bent portion 17 Support 17a Vertical rib plate 17b Connecting pin 18 Support bracket 18a Recess 19 Hydraulic pressure Cylinder (cylinder actuator)
19a rod 19b cylinder main body 19c rod connecting pin 19d main body connecting pin 20 rod changer (shaft center adjusting device)
21 inner guide 21a tapered surface (tapered inner peripheral surface)
21b Through hole 21c Upper arm 21d Lower arm 22 Inner clamp 22a V-shaped taper mechanism 22b Cylinder 22c Upper clamp arm 22d Lower clamp arm 23U Upper outer clamp (first gripping mechanism)
23Ua V-shaped roller taper mechanism 23Ub Upper outer clamp cylinder 23Uc Upper clamp arm 23Ud Lower clamp arm 23L Lower outer clamp (first gripping mechanism)
23La V-shaped taper mechanism 23Lb Lower outer clamp cylinder 23Lc Upper clamp arm 23Ld Lower clamp arm 24 Clamp slide mechanism 25 Inner centering cylinder 25a Rod 25b Cone shape (taper outer peripheral surface)
26 Turning bracket 27 Turning actuator 28U Upper connecting member 28L Lower connecting member 29 Rod changer strut 30 Leader device 31 Chain 32 Head slide mechanism 33 Hydraulic motor for chain 40 Rotary drive device 40a Inner end 40b Outer end 40c Hydraulic motor 40d Hydraulic impact device 50 structure 60 centralizer (guide mechanism)
61 outer guide 61a tapered surface 61b opening (another opening)
62b Opening 62c Upper surface 62L Left inner guide 62La Left tapered surface (tapered surface)
62R Right inner guide 62Ra Right tapered surface (tapered surface)
63L left cylinder 63R right cylinder 64 housing bracket 65 bolt 71 first clamp (first gripping mechanism)
72 second clamp (second gripping mechanism)
73 third clamp (third gripping mechanism)
100 drilling device

Claims (8)

a rotary drive device (40) for rotating and penetrating a double pipe (1) consisting of an inner pipe (1a) and an outer pipe (1b) into at least the ground/rock/structure;
a leader device (30) for guiding the steel pipe (1) in an arbitrary construction direction while supporting the rotary drive device (40);
a first gripping mechanism (71) provided below the reader device (30) for gripping the inner tube (1a) and loosening screw fastening between the inner tubes (1a) or the outer tubes (1b);
a second gripping mechanism (72) provided below the first gripping mechanism (71) for gripping the inner tube (1a);
A third gripping mechanism (73) that is provided below the second gripping mechanism (72) and grips the outer tube (1b),
A drilling device for drilling the ground while successively adding double pipes (1),
Above the first gripping mechanism (71),
Taper surfaces (62La, 62Ra) having an opening (62b) for selectively passing the inner tube (1a) and the outer tube (1b), and the edges of the opening (62b) being inclined obliquely downward toward the center A drilling device, characterized in that it is provided with a guide mechanism (60) that is formed in a shape. The drilling device according to claim 1,
The member (62) on which the tapered surfaces (62La, 62Ra) are formed is divided into two members (62L, 62R), and each member (62L, 62R) is configured to be movable horizontally and in opposite directions to each other. A drilling device characterized by: In the drilling device according to claim 1 or 2,
A hole drilling characterized in that the center of the opening (62b) is set to coincide with the axis of an inner end (40a) to which the inner pipe (1a) is connected in the rotary drive device (40). Device. In the drilling device according to any one of claims 1 to 3,
The guide mechanism (60) includes another opening (61a) formed on a tapered surface (61b) whose edge is inclined downward toward the center for guiding the outer tube (1b) to the opening (62b). ). In the drilling device according to claim 4,
The center of the other opening (61a) is set to coincide with the axis of the outer end (40b) to which the outer tube (1b) is connected in the rotary drive device (40). drilling equipment. In the drilling device according to any one of claims 1 to 5,
A drilling device, wherein the rotary drive device (40) has an impact device that applies an impact force to the double pipe (1). In the drilling device according to any one of claims 1 to 6,
An axial center adjustment device (20) for adjusting the axial center of the double tube (1) in a predetermined direction is provided in parallel next to the leader device (30),
A double pipe stock device (10) for storing the double pipe (1) is provided in parallel next to the axial center adjustment device (20),
A drilling apparatus characterized in that the double pipe stock device (10) and the axial center adjustment device (20) are configured to be raised and lowered in conjunction with the leader device (30). In the drilling device according to claim 7,
The double pipe stock device (10) has transfer means (11) for transferring the double pipe (1) to the axial center adjusting device (20) and can be tilted at a predetermined position (17b) as a fulcrum. configured to
The shaft center adjustment device (20) includes gripping mechanisms (22, 23U, 23L) which always form an opening through which the double pipe (1) can pass on the side of the double pipe stock device (10), A turning mechanism (26, 27) for turning the adjusted double tube (1) to the side of the leader device (30),
A drilling device, wherein the leader device (30) comprises a slide mechanism (32) for laterally moving a rotary drive device (40).

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