JP7406187B2 - hole drilling equipment - Google Patents

Description

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

Conventionally, as a method of drilling a hole in the ground, a rotary percussion method is widely known in which the hole is drilled while applying rotational force and striking force. This rotary percussion method has the advantage of being able to drill holes not only in sand and boulder layers, but also in bedrock, since hard rock is crushed by impact force.
Therefore, rotary percussion is used as a drilling method in slope disaster prevention construction techniques, such as ground anchor work, which is one of the landslide prevention works, or horizontal boring, which is one of the landslide prevention works, or as a method for stabilizing the face in tunnel construction. It is widely used as a drilling method in the chemical injection method, which is one of the methods.

To briefly explain the drilling process using rotary percussion, first, a double pipe tool (or "double pipe rod") consisting of an outer casing and an inner rod is connected to a rotation drive device (or swivel head). Then, a hole is drilled in the ground while applying a striking force to the double pipe tool by the rotational drive device and applying rotational force by the rotational drive device. The hole is then drilled to a predetermined depth while supplementing with double pipe tools. When the double pipe tools reach the target depth, the drilling is completed.

After drilling is complete, remove all inner rods. After that, all the outer casings are removed and construction is completed.

Japanese Patent Application Publication No. 9-78976 Japanese Patent Application Publication No. 5-263581 Utility Model Publication No. 6-20592 Japanese Patent Application Publication No. 2000-337074

Until now, in the above-mentioned double pipe replenishment process, the connection of the double pipe tools to the rotary drive device was done by connecting the leader device at an angle (for example, in ground anchor work for landslide prevention work, the depression angle of the double pipe tools in the drilling direction was 90°). On the other hand, in horizontal boring work for landslide prevention works, the depression angle in the drilling direction using double pipe tools is 30°. I was working on aligning and connecting pipe tools and rotary drive equipment. Double pipe tools are heavy, weighing at least 40 kg, and have a long overall length of at least 1 m, so it takes a lot of effort to manually align and connect the double pipe tools to the rotary drive device. There is a danger of being caught in the rotational drive device.

In addition, when connecting the double pipe tools (double pipe tools on the drilling side) that have penetrated underground to the double pipe tools attached to the rotary drive device (double pipe tools on the rotary drive device side), While lowering the inner rod on the rotary drive device side using a leader device, an operator performed centering work for the inner rod on the device side with respect to the axis of the inner rod on the drilling side.

However, since the inner rod on the rotary drive device side is long in the longitudinal direction, the axis of the tip of the inner rod on the device side may be bent toward the drilling side due to the influence of gravity or due to the bending of the inner rod itself on the device side. There are many cases where the inner rod is significantly eccentric with respect to its axis. In the worst case, it may happen that the inner rod on the device side cannot be aligned with the axis of the inner rod on the hole drilling side, and the inner rod on the device side cannot be connected to the inner rod on the hole drilling side.

In this way, with conventional drilling equipment that drills holes in the ground to a predetermined depth while adding double pipe tools, it is difficult to connect the inner rod on the rotary drive side to the inner rod on the drilling side smoothly and stably. The problem is that it can't be done.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to provide a drilling device for drilling a hole in the ground to a predetermined depth while adding double pipe tools consisting of an inner pipe and an outer pipe. It is an object of the present invention 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.

To achieve the above object, a drilling device according to the present invention is a rotary drilling device that rotates and penetrates a double pipe (1) consisting of an inner pipe (1a) and an outer pipe (1b) into at least underground, rock, and structures. A drive device (40), a leader device (30) for guiding the double pipe (1) in an arbitrary construction direction while supporting the rotary drive device (40), and a leader device (30) provided below the leader device (30). a first gripping mechanism (71) that grips the inner tube (1a) and loosens the screw fastening between the inner tubes (1a) or the outer tubes (1b); and a first gripping mechanism (71) provided below the first gripping mechanism (71). a second gripping mechanism (72) that grips the inner tube (1a); and 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 a hole in the ground while sequentially adding double pipes (1), comprising an inner pipe (1a) and an outer pipe (1b) above the first gripping mechanism (71). A guide mechanism (60) is provided, which has an opening (62b) for selectively allowing passage, and the edge of the opening (62b) is formed into a tapered surface (62La, 62Ra) that slopes diagonally downward toward the center. It is characterized by being

In the above configuration, the edge of the opening (62b) has tapered surfaces (62La, 62Ra) that are inclined diagonally downward toward the center, so that the tip of the inner tube (1a) on the rotary drive device side smoothly fits into the opening (62b). It passes through the opening (62b) and connects to the inner tube (1a) on the drilling side. In addition, since the opening (62b) can selectively allow the outer tube (1b) to pass through, when connecting the outer tube (1b) on the rotary drive device side and the outer tube (1b) on the drilling side, The tip of the outer tube (1b) on the rotary drive device side passes through the opening (62b) and is smoothly connected 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) on which the tapered surfaces (62La, 62Ra) are formed is divided into two members (62L, 62R), and each member (62L, 62R) is divided into two members (62L, 62R). are configured to be movable horizontally in opposite directions.

In the above configuration, for example, by attaching each member (62L, 62R) in which the tapered surface (62La, 62Ra) is formed to the tip of the cylinder (63L, 63R) that performs reciprocating motion, the inner tube (1a) and the outer tube (1b) can be selectively passed.

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

In the above configuration, when the distal end of the inner tube (1a) on the device side passes through the opening (62b), the axis of the distal end of the inner tube (1a) on the device side is automatically adjusted to the inner end (1a) on the device side. 40a).

A fourth feature of the drilling device according to the present invention is that the guide mechanism (60) has an edge for guiding the outer tube (1b) to the opening (62b) that is inclined diagonally downward toward the center. Another opening ( 61b ) is formed in the tapered surface ( 61a ).

In the above configuration , even if the axis of the distal end of the inner tube (1a) on the apparatus side is largely eccentric, the inner tube (1a ) on the apparatus side is The tip portion 1a) is guided to the opening (62b) and smoothly guided to the inner tube (1a) on the drilling side. Similarly, the tip of the outer tube (1b) on the device side is also smoothly guided to the outer tube (1b) on the drilling side by the tapered surface ( 61a ) of the other opening ( 61b ).

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

In the above configuration, when the tip of the outer tube (1b) on the device side passes through the other opening ( 61b ), the axis of the tip of the outer tube (1b) on the device side automatically aligns with the outer tube on the device side. It will be adjusted to the axis of the end (40b).

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

With the above configuration, 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 adjustment device (20) for adjusting the axial center of the double pipe (1) in a predetermined direction is arranged in parallel next to the leader device (30). A double tube stock device (10) for storing the double tube (1) is provided in parallel next to the axis adjustment device (20), and the double tube 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).

An eighth feature of the drilling device according to the present invention is that the double pipe stock device (10) includes a transfer means (11) for transferring the double pipe (1) to the axis adjustment device (20). The axis adjustment device (20) is configured to be able to be raised and lowered using a predetermined position (17b) as a fulcrum, while the double tube (1) can pass through the double tube stock device (10) side. a gripping mechanism (22, 23U, 23L) that always forms an opening, and a turning mechanism (26, 27) that turns the double tube (1) whose axis is adjusted toward the reader device (30). , the reader device (30) includes a slide mechanism (32) for laterally moving the rotation 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 aligns the received double pipe (1) with the axis. It can now be transferred to the conditioning device (20). Further, the axis adjustment device (20) can position the double tube (1) whose axis has been adjusted on the axis of the rotary drive device (40), and the leader device (30) can have its axis adjusted. The double pipe (1) can be connected to the rotary drive device (40) and added to the double pipe (1) on the drilling side.

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

FIG. 1 is an explanatory diagram showing a hole drilling device according to an embodiment of the present invention. It is an explanatory view showing a rod stocker and a rod changer according to the present invention. FIG. 3 is an explanatory diagram showing the raising/lowering structure of the rod stocker according to the present invention. FIG. 3 is an explanatory diagram showing a gripping mechanism of the rod changer according to the present invention. FIG. 3 is an explanatory diagram showing an axial center adjustment structure for an inner rod of a rod changer according to the present invention. FIG. 2 is an explanatory diagram showing a connection structure between a rotational drive device and an outer casing. FIG. 3 is a flow diagram showing a series of rod exchange processes from when the double pipe rod is placed on the rod stocker until it is connected to the rotational drive device. It is an explanatory view showing a state where a double pipe rod is set in a rod stocker. It is an explanatory view showing a state where the rod stocker is raised to a predetermined position. It is an explanatory view showing a state where the outer casing is gripped by the upper and lower outer clamps. FIG. 3 is an explanatory diagram showing the axial center adjustment of the inner rod. It is an explanatory view showing a state where the swing bracket of the rod changer is turned from the rod stocker side to the leader device side. It is an explanatory view showing a state where the inner guide is opened and the rotational drive device is slid toward the rod changer side. It is an explanatory view showing the connection between the inner end of the rotary drive device and the inner rod of the double pipe rod. FIG. 3 is an explanatory diagram showing a state in which the outer casing is raised while being gripped by upper and lower outer clamps. It is an explanatory view showing the connection between the outer end of the rotary drive device and the outer casing of the double pipe rod. It is an explanatory view showing a V-shaped roller taper mechanism attached to the tip of the upper outer clamp cylinder. FIG. 2 is an explanatory diagram showing a hole drilling device in the vicinity of a centralizer in a state where an inner guide according to the present invention is closed. FIG. 2 is an explanatory diagram showing a hole drilling device in the vicinity of a centralizer in a state where the inner guide is open according to the present invention. FIG. 2 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 closed. FIG. 2 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. 6 is an explanatory diagram showing a function of guiding the inner rod toward the opening by the centralizer according to the present invention.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

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

This drilling device 100 adjusts the axis of the double pipe rod 1 while maintaining the inclination angle of the leader device 30 as it is at any construction angle of the double pipe rod 1. The configuration is such that 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-pipe rods 1, a rod stocker 10 for storing the double-pipe rods 1, a rotary drive device 40 for centering the double-pipe rods 1, and a rotary drive device 40 for centering the double-pipe rods 1. A rod changer 20 that positions the rod changer 20 on the core (on the axis), a leader device 30 that moves the rotary drive device 40 up and down along a predetermined direction, and a rotational force applied to the double tube rod 1 attached to the rotary drive device 40. A rotary drive device 40 that provides thrust and impact force, a structure 50 to which each element is attached, and a centralizer that positions the axis of the double pipe rod 1 attached to the rotary drive device 40 within a predetermined range. 60.

Note that "centering" here means "positioning the double-pipe rod 1 so that the axis of the double-pipe rod 1 falls within a predetermined range." Further, 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 a free state within the outer casing 1b. Further, the rod stocker 10 will be explained in detail with reference to FIGS. 2 and 3. The rod changer 20 will be explained in detail with reference to FIGS. 2, 4 and 5.

Incidentally, the rod stocker 10 is integrated into the rod changer 20 via a support bracket 18 and a rod changer support 29 so as to be freely raised and lowered by a hydraulic cylinder 19. The rod changer 20 is integrated into the leader device 30 by an upper connecting member 28U and a lower connecting member 28L. The reader device 30 is attached to the body structure 50 so as to be able to rise and fall. 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 directly integrated into the reader 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 explained below.

The leader device 30 moves the rotary drive device 40 up and down using a chain 31. The chain 31 is wound between a driving sprocket (not shown) and a driven sprocket (not shown) provided at both ends of the leader device 30, and is rotationally driven by a chain hydraulic motor 33. Further, a head slide mechanism 32 is provided that offsets the rotational drive device 40 in the lateral direction on the rod changer 20 side.

The leader device 30 is configured to be capable of standing up and tilting in the front and rear directions around a front and rear leader fulcrum (not shown) by means of a raising/lowering cylinder (not shown).

The rotation 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, and two hydraulic motors that rotate the double pipe rod 1. 40c, 40c, and a hydraulic impact device 40d that applies an impact force to the double pipe rod 1.

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 that drives the transfer chains 11, 11, and a double Stopper pins 13, 13 that prevent the tube rod 1 from falling off, a back frame 14 that pushes the double tube rod 1 from behind in the transfer direction, and an upper tube support bracket 15U that supports the upper side of the double tube rod 1. A lower tube support bracket 15L that supports the lower side of the double tube rod 1, an upper movement regulating plate 16U that restricts the 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 downward movement regulating plate 16L that regulates the movement of the pillar 16; a pillar 17 to which each element is attached; a pillar bracket 18 that supports the pillar 17 so as to be able to raise and lower (swing) and also supports the hydraulic cylinder 19; A hydraulic cylinder 19 is provided.

The support column 17 is arranged so as to be parallel to the swing bracket 26 of the rod changer 20, and is attached to the support bracket 18 so as to be able to rise and fall (swing). Rotating shafts 12a and 12b are arranged parallel to each other on both sides of the support column 17. Driving 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 is wound around the driving sprocket 12c and the driven sprocket 12d so as to straddle the support 17. As a result, an endless chain type transfer means for transferring the double tube rod 1 to the rod changer 20 is constructed on the support 17.

Further, the hydraulic motor 12 and the hydraulic cylinder 19 are arranged outside the support column 17. Furthermore, by arranging the clamps 22, 23U, 23L of the rod changer 20, which always have an opening through which the double-tube rod 1 can pass, in a position where they do not interfere with the transfer chain 11 and the rotating shaft 12b of the rod stocker 10, It becomes possible to shorten the distance between the rod stocker 10 and the rod changer 20. Thereby, 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 respectively provided with upwardly protruding protrusions 15U1 and 15L1 at the ends opposite to the rod changer 20 side. These protrusions 15U1, 15L1 make it possible to prevent the double pipe rod 1 from falling off from the upper and lower pipe support brackets 15U, 15L when the rod stocker 10 is placed in a horizontal state.

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

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 will not fall off from the rod stocker 10 even if the rod stocker 10 takes an arbitrary inclination angle. This means the position where both ends of the rod 1 coincide with the lower sides of the upper and lower bent portions 16U1 and 16L1. In this case, the double pipe rod 1 is stopped in the axial direction (longitudinal direction) by the upward and downward movement regulating plates 16U, 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 pipe rod 1 is restrained by upper and lower bent portions 16U1 and 16L1.

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

FIG. 3 is an explanatory diagram showing the raising/lowering structure of the rod stocker 10 according to the present invention.
The rod stocker 10 has a tilting structure using a hydraulic cylinder 19, so that the support 17 can be horizontally maintained while maintaining 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). state, it becomes possible to receive a new double-tube rod 1 and to return the inclination angle of the support column 17 to the inclination angle of the leader device 30 (rod changer 20) after receiving the new double-tube rod 1. This makes it possible to center the subsequent double pipe rod 1 regardless of the construction angle of the double pipe rod 1 (the inclination angle of the leader device 30), and also makes it possible to center the double pipe rod 1 after centering. It becomes possible to connect the rod 1 to the rotary drive device 40. Note that the term "centering the double tube rod 1" as used herein refers to the positioning of both the inner "axial center positioning of the inner rod 1a" and the outer "axial center positioning of the outer casing 1b". are doing.

A vertical rib plate 17a is provided on the lower side of the rear portion of the column 17 (near the lower movement regulating plate 16L). This vertical rib plate 17a is provided with a connecting pin 17b that allows the support 17 to swingably integrate with the support bracket 18. On the other hand, the support bracket 18 is provided with a recess 18a into which the vertical rib plate 17a is fitted. The vertical rib plate 17a fits into the recess 18a when the hydraulic cylinder 19 operates, thereby preventing the column 17 from swinging laterally. Thereby, the support 17 on which the double pipe rod 1 is placed can be raised and lowered stably.

In the hydraulic cylinder 19, a rod 19a is swingably attached to a vertical rib plate 17a by a rod connecting pin 19c. On the other hand, the cylinder main body 19b is swingably attached to the support bracket 18 by a main body connecting pin 19d. Therefore, when the rod 19a of the hydraulic cylinder 19 extends, the support column 17 swings upward in the figure (stands up) using the connecting pin 17b as a fulcrum. On the other hand, when the rod 19a of the hydraulic cylinder 19 contracts, the support column 17 swings (tilts) up and down in the figure using the connecting pin 17b as a fulcrum. Therefore, when the rod stocker 10 receives the double tube rod 1, the hydraulic cylinder 19 will contract 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 to FIG. 2 again, the rod changer 20 includes an inner guide 21 for centering the inner rod 1a of the double tube rod 1, an inner clamp 22 for gripping the inner rod 1a, and an outer casing of the double tube rod 1. An upper outer clamp 23U that grips the upper side of the outer casing 1b, a lower outer clamp 23L that grips the lower side of the outer casing 1b, and a clamp slide mechanism 24 that moves the lower outer clamp 23L up and down along the longitudinal direction of the swing bracket 26. An inner centering cylinder 25 that centers the inner rod 1a, a swing bracket 26 that moves the double pipe rod 1 that has been centered onto the axis of the rotary drive device 40, and a swing that swings the swing bracket 26. an upper connecting member 28U and a lower connecting member 28L that integrate the swing bracket 26 with the reader device 30, and a rod changer support 29 for supporting the rod stocker 10. The inner guide 21, inner clamp 22, and upper and lower outer clamps 23U and 23L will be described later with reference to FIG. 4.

The rod changer support column 29 supports an upper connecting member 28U and a lower connecting member 28L. A swing bracket 26 is rotatably attached between the upper connection member 28U and the lower connection 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 into a swing bracket 26 via a predetermined bracket. Further, the swing bracket 26 is rotated by a swing actuator 27.

FIG. 4 is an explanatory diagram showing a gripping mechanism of the rod changer 20 according to the present invention. Note that FIG. 4 shows the main parts of the rod changer 20 when the swing bracket 26 swings toward the leader device 30 side.

The inner guide 21 is configured such that an upper arm 21c and a lower arm 21d are respectively swingable. Therefore, when the inner guide 21 opens, the outer casing 1b of the double pipe rod 1 can pass through the inner guide 21. 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 within a predetermined range (within a tolerance range) around the axis of the inner end 40a of the rotary drive device 40 when the swing bracket 26 is turned as a fulcrum by a predetermined angle. It is preset as follows. Therefore, by passing the inner rod 1a through the through hole 21b formed at the center of the semi-conical shape (tapered surface 21a), the axis of the inner rod 1a is aligned with the axis of the inner end 40a of the rotary drive device 40. It will pass within the predetermined 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), so even if the double pipe rod 1 is inclined, the inner centering can be easily adjusted. When the cylinder 25 pushes the rear end of the inner rod 1a, the tip of the inner rod 1a is smoothly guided into the through hole 21b (FIG. 5).

On the inner circumferential surface of the inner clamp 22 (the surface facing the side surface of the inner rod 1a), cylinders 22b, 22b each having a V-shaped taper mechanism 22a (FIG. 5) attached to their tips are arranged symmetrically with respect to the upper and lower points. . Therefore, when the cylinders 22b, 22b grip the inner rod 1a from above and below, the axis of the inner rod 1a is positioned at a predetermined position. Note that this "predetermined position" means that when the axis of the inner rod 1a is rotated by a predetermined angle using the swing bracket 26 as a fulcrum, the axis of the inner rod 1a is at the position of the inner end 40a of the rotary drive device 40. This is a position that passes within a predetermined range (within a tolerance range) centered on the axis.

Note that the upper and lower clamp arms 22c and 22d of the inner clamp 22 are immovable and always fixed. As a result, an opening is always formed on the rod stocker 10 side of the inner clamp 22 through which the double pipe rod 1 (outer casing 1b) can pass.

Further, on the inner peripheral surface of the upper outer clamp 23U (the surface facing the side surface of the outer casing 1b), upper outer clamp cylinders 23Ub, 23Ub, each having a V-shaped roller taper mechanism 23Ua (FIG. 17) attached to the tip thereof, are arranged vertically. They are arranged symmetrically. Therefore, when the upper outer clamp cylinders 23Ub, 23Ub grip the outer casing 1b from the vertical direction, the axis of the outer casing 1b is positioned at a predetermined position. Note that this "predetermined position" means that when the axis of the outer casing 1b is rotated by a predetermined angle using the swing bracket 26 as a fulcrum, the axis of the outer casing 1b is at the position of the outer end 40b of the rotary drive device 40. This is a position that passes within a predetermined range (within a tolerance range) centered on the axis. Moreover, this 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 center position.

Note that the upper and lower clamp arms 23Uc and 23Ud of the upper outer clamp 23U are immovable and always fixed. As a result, an opening through which the double pipe 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 circumferential surface of the lower outer clamp 23L (the surface facing the side surface of the outer casing 1b), lower outer clamp cylinders 23Lb, 23Lb each having a V-shaped taper mechanism 23La attached to their tips are arranged symmetrically with respect to the upper and lower points. ing. Therefore, when the lower outer clamp cylinders 23Lb, 23Lb grip the outer casing 1b from the vertical direction, the axis of the outer casing 1b is positioned at a predetermined position. Note that this "predetermined position" means that when the axis of the outer casing 1b is rotated by a predetermined angle using the swing bracket 26 as a fulcrum, the axis of the outer casing 1b is at the position of the outer end 40b of the rotary drive device 40. This is a position that passes within a predetermined range (within a tolerance range) centered on the axis.

Note that the upper and lower clamp arms 23Lc and 23Ld of the lower outer clamp 23L are immovable and always fixed. As a result, the lower outer clamp 23L always has an opening formed on the rod stocker 10 side through which the double pipe rod 1 (outer casing 1b) can pass.

In this way, 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.

Although details will be described later with reference to FIG. 15, the lower outer clamp 23L is configured to be movable along the axial direction (longitudinal direction) of the swing bracket 26 by the clamp slide mechanism 24. This makes it possible to bring the outer casing 1b close 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, maintain the axial position of the outer casing 1b. Become. As a result, when connecting the outer casing 1b of the double tube rod 1 to the rotary drive device 40, there is no need to lower/raise the rotary drive device 40. This makes it possible to minimize the number of times the rotary drive device 40 is raised and lowered during the work of connecting the double tube rod 1 and the rotary drive device 40.

FIG. 5 is an explanatory diagram showing an 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 reduced in diameter toward the inner guide 21. On the other hand, the inner guide 21 has a semi-conical tapered surface 21a whose inner peripheral surface is reduced in diameter toward the center, and a through hole 21b formed at the center of the tapered surface 21a. Note that since the inner guide 21 is configured to be divided into two, the tapered surface 21a and the through hole 21b are also configured to be divided into two.

First, the inner rod 1a of the double pipe rod 1 passes through the inside of the outer casing 1b by the inner centering cylinder 25 and comes into contact with the tapered surface 21a of the inner guide 21. 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 the axes of the tip are aligned by fitting into the through hole 21b. 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 axes are also aligned at the rear end, and the centering of the inner rod 1a is completed. By gripping the inner rod 1a in this 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 approaches the rotary drive device 40 to be connected to it while maintaining the axial position of the outer casing 1b. 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. Thereafter, 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 the axis is held. Thereafter, the reader 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. In this way, by moving the lower outer clamp 23L using the clamp slide mechanism 24, the movement process 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 performed efficiently. You will be able to do this. Below, a series of processes from when the double pipe rod 1 is placed on the rod stocker 10 until it is connected to the rotation drive device 40 will be described.

FIG. 7 is a flow diagram showing a series of rod exchange processes from when the double tube rod 1 is placed on the rod stocker 10 until it is connected to the rotational drive device 40.

First, in process P1, as shown in FIG. 8, the double pipe rod 1 is set in the rod stocker 10. The double pipe rod 1 is set using, for example, a lifting and turning device such as a crane. In this case, the support column 17 of the rod stocker 10 is turned from an inclined state to a horizontal state by the hydraulic cylinder 19. Note that the angle of inclination of the support column 17 of the rod stocker 10 can be calculated based on the stroke amount of the hydraulic cylinder 19.

Thereafter, 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 pipe rod 1 is stably supported by the upper and lower bent portions 16U1 and 16L1, the support column 17, the stopper pins 13 and the back frame 14 without falling off. Note that the amount of transfer of the double pipe rod 1 can be calculated based on the amount of rotation of an encoder (not shown) attached to the hydraulic motor 12, for example.

Next, in process P2, as shown in FIG. 9, the double pipe rod 1 is erected to a predetermined position. The column 17 of the rod stocker 10 is erected by the hydraulic cylinder 19 to a position parallel to the swing bracket 26 of the rod changer 20. Thereafter, the double tube rod 1 is transferred to the rod changer 20 using the transfer chain 11. The outer casing 1b of the double tube rod 1 fits into 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, centering of the outer casing 1b is automatically performed.

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, which has a male cone shape 25b attached to its tip, engages 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 toward the inner guide 21 while contacting 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 is fitted into the through hole 21b. By further extending the rod 25a, the cone shape 25b of the rod 25a fits into the rear end of the inner rod 1a (FIG. 11(b)). Thereby, 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 tip end blocked by the upper and lower arms 21c and 21d of the inner guide 21.

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

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

Next, in process P6, as shown in FIG. 12, the inner guide 21, inner clamp 22, and upper and lower outer clamps 23U and 23L are rotated from the rod stocker 10 side to the leader side 30.

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

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 pipe rod 1 are positioned on the respective axes of the inner end 40a or 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. The rotary drive device 40 is lowered and 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 grip 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 contracted.

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

Next, in process P13, as shown in FIG. 16, the outer casing 1b is connected to the outer end 40b of the rotary drive device 40. 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 pipe rod 1 and the rotational 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. The grip from the upper and lower directions by the upper outer clamp cylinders 23Ub and 23Ub is released. Further, 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 rotation drive device 40 to which the double tube rod 1 is connected is returned to the reader device 30 side by the head slide mechanism 32.

As described above, according to the drilling device 100 of the present invention, the axis of the double-pipe rod 1 can be adjusted while maintaining the inclination angle of the leader device 30 as it is at any construction angle of the double-pipe rod 1. It becomes possible to automatically connect and disconnect the tube rod 1 to and from the rotary drive device 40.

FIG. 17 is an explanatory diagram showing a 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 sectional view of the main part of the upper outer clamp 23U, and FIG. 17(b) is a perspective view of the main part of the V-shaped roller taper mechanism 23Ua.

As shown in FIG. 17(a), a V-shaped roller taper mechanism 23Ua, in which an inclined roller is laterally folded back symmetrically, is arranged vertically point-symmetrically. Therefore, when the outer casing 1b is gripped from above and below by the V-shaped roller taper mechanisms 23Ua, 23Ua, 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 done. Note that this "predetermined position" is the intersection of "the line segment connecting the upper contact point P1 and the lower contact point P2" and the "line segment connecting the upper contact point P2 and the lower contact point P1".

Note that, in the inner clamp 22, the axis of the inner rod 1a is positioned at a predetermined position formed by V-shaped taper mechanisms 22a, 22a, which are formed by folding the inclined rough-faced plates symmetrically in the transverse direction. Similarly, in the lower outer clamp 23L, the axis C1b of the outer casing 1b is positioned at a predetermined position formed by the V-shaped taper mechanisms 23La, 23La, which are formed by folding the inclined rough surface plates symmetrically in the horizontal direction. Become.

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

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

The centralizer 60 is fixed to the upper surface of a first clamp 71 provided at the bottom of the reader device 30 by, for example, a bolt 65. In addition to the gripping mechanism, the first clamp 71 includes a rotation mechanism that rotates the screw fastening portions of the inner rods 1a, 1a or the outer casings 1b, 1b by about 40 degrees. Therefore, the first clamp 71 is used when it is difficult to loosen the screwed inner rods 1a, 1a or the outer casings 1b, 1b with only the rotational force (torque) of the rotary drive device 40.

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.

The configuration of the centralizer 60 is such that the axis of the tip of the outer casing 1b attached to the rotary drive device 40 is aligned with the axis of the outer end 40b of the rotary drive device 40 (the axis of the outer casing 1b on the drilling side). The outer guide 61 is positioned so that the axis of the tip of the inner rod 1a attached to the rotation drive device 40 side is aligned with the axis of the inner end 40a of the rotation drive device 40 (the axis of the inner rod 1a on the drilling side). a left inner guide 62L and a right inner guide 62R that are positioned to match the axis), a left cylinder 63L that moves the left inner guide 62L in the horizontal direction, and a right cylinder 63R that moves the right inner guide 62R in the horizontal direction. The centralizer 60 includes a housing bracket 64 that horizontally movably houses the left and right inner guides 62L and 62R. Each configuration will be further explained below.

As shown in FIG. 20, the outer guide 61 is an annular body having a circular opening 61b formed in the center thereof through which the outer casing 1b passes, and is attached to the upper part of the accommodation bracket 64. Note that the housing bracket 64 has, for example, a bottomless hollow box shape with an open top surface. The opening 64a on the upper surface 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 diagonally downward toward the center. This tapered surface 61a functions to smoothly guide the tip of the outer casing 1b on the rotation drive device 40 side into the opening 61b.

Further, the center (hole center) of the opening 61b is set at a position that coincides with the axis of the outer end 40b of the rotational drive device 40. 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 axis of the outer casing 1b on the drilling side coincides with the axis of the outer end 40b of the rotary drive device 40, by passing the opening 61b of the outer casing 1b on the rotary drive device 40 side, the rotation can be made. Centering of the outer casing 1b on the driving device 40 side and the outer casing 1b on the drilling side is automatically performed.

An inner guide 62 is provided below the outer guide 61 for positioning the axis of the tip of the inner rod 1a attached to the rotary drive device 40. The inner guide 62 is composed of a left inner guide 62L and a right inner guide 62R, which correspond to one half annular body when the annular body is divided into two. Therefore, the shape in which the left inner guide 62L and the right inner guide 62R are joined forms an annular body having a circular opening 62b formed in the center thereof through which the inner rod 1a passes, similar to the outer guide 61.

The upper outer peripheral edge of the left inner guide 62L forms a left tapered surface 62La that is inclined diagonally 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 that is inclined diagonally downward toward the center of the opening 62b. These left and right tapered surfaces 62La and 62Ra function to smoothly guide (sawn in) the tip of the inner rod 1a on the rotation drive device 40 side into the opening 62b.

Further, the center (hole center) of this opening 62b is set at a position that coincides with the axis of the inner end 40a of the rotary drive device 40. Further, 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 axis of the inner rod 1a on the drilling side coincides with the axis of the inner end 40a of the rotation drive device 40, by passing the inner rod 1a on the rotation drive device 40 side through the opening 62b, the rotation can be made. The centering of the inner rod 1a on the driving device 40 side and the inner rod 1a on the drilling side is automatically performed.

Further, the left inner guide 62L is configured to be movable in the horizontal direction within the housing bracket 64 by a left cylinder 63L. Similarly, the right inner guide 62R is also configured to be movable in the horizontal direction within the housing bracket 64 by the 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 moves to the left in the figure, and the right inner guide 62R moves to the right in the figure. Make sure that the passage of the casing 1b is not obstructed.

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

FIG. 22 is an explanatory diagram showing the function of guiding the inner rod 1a toward the opening 62b by the centralizer 60. For convenience of explanation, the axis passing through the center of the opening 62b created 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 inner rod 1a is moved to the center of the opening 61b by the tapered surface 61a. be guided by.

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

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 and 62Ra by the feeding force of the leader device 30.

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

In this way, even if 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 be It is guided to the left and right tapered surfaces 62La and 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 by passing through the opening 62b, it is smoothly aligned with the reference axis on the drilling side.

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

Although the drilling device 100, which is an embodiment of the present invention, has been described above with reference to the drawings, the embodiment of the present invention is not limited to the above. That is, various modifications and changes can be made within the technical scope of the present invention. For example, it is also possible to separately provide a raising/lowering cylinder for raising and lowering the rod changer 20 so that the rod changer 20 is interlocked with the leader device 30 by the raising/lowering cylinder.

Moreover, it is also possible to use an electric motor in place of the hydraulic motor 12 that rotationally drives 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 support column 17.

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

Moreover, 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 diagonally downward, vertically upward, or vertically diagonally upward. That is, the angle θ between the drilling target 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 pipe support bracket 15U1 Protrusion 15L Lower pipe support bracket 15L1 Protrusion 16U Upper movement regulating plate 16U1 Upper bent part 16L Lower movement regulating plate 16L1 Lower bent part 17 Support 17a Vertical rib plate 17b Connection pin 18 Support bracket 18a Recess 19 Hydraulic pressure Cylinder (cylinder actuator)
19a Rod 19b Cylinder body 19c Rod connecting pin 19d Main body connecting pin 20 Rod changer (axis center adjustment 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 (tapered outer peripheral surface)
26 Swing bracket 27 Swing actuator 28U Upper connecting member 28L Lower connecting member 29 Rod changer support 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 (other opening)
62b Opening 62c Top 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 Accommodation bracket 65 Bolt 71 First clamp (first gripping mechanism)
72 Second clamp (second gripping mechanism)
73 Third clamp (third gripping mechanism)
100 Hole drilling device

Claims (7)

a rotation drive device (40) that rotates and penetrates a double pipe (1) consisting of an inner pipe (1a) and an outer pipe (1b) into at least underground, rock, and structures;
a leader device (30) that guides the double pipe (1) in an arbitrary construction direction while supporting the rotation drive device (40);
a first gripping mechanism (71) provided below the leader device (30) to grip the inner tube (1a) and loosen screws between the inner tubes (1a) or the outer tubes (1b);
a second gripping mechanism (72) provided below the first gripping mechanism (71) and gripping the inner tube (1a);
a third gripping mechanism (73) provided below the second gripping mechanism (72) and gripping the outer tube (1b);
A drilling device that drills holes in the ground while sequentially adding double pipes (1),
Above the first gripping mechanism (71),
A tapered surface (62La, 62Ra) having an opening (62b) through which the inner tube (1a) and the outer tube (1b) selectively pass, and the edge of the opening (62b) slopes diagonally downward toward the center. A guide mechanism (60) is provided, which is molded into
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 in opposite directions.
A hole drilling device characterized by: The drilling device according to claim 1 ,
The center of the opening (62b) is set to coincide with the axis of the inner end (40a) to which the inner tube (1a) is connected in the rotary drive device (40). Device. The drilling device according to claim 1 or 2 ,
The guide mechanism (60) includes another opening (61b) formed into a tapered surface ( 61a ) whose edge is inclined diagonally downward toward the center for guiding the outer tube (1b) to the opening ( 62b ). ) A drilling device characterized by having: The drilling device according to claim 3 ,
The center of the other opening ( 61b ) 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. The drilling device according to claim 1 ,
A drilling device characterized in that the rotation drive device (40) has an impact device that applies impact force to the double pipe (1). The drilling device according to claim 1 ,
An axis adjustment device (20) for adjusting the axis of the double pipe (1) in a predetermined direction is provided in parallel next to the leader device (30), and
A double pipe stock device (10) for storing the double pipe (1) is provided in parallel next to the axis adjustment device (20),
The double pipe stock device (10) and the axis adjustment device (20) are configured to be raised and lowered in conjunction with the leader device (30). The drilling device according to claim 6 ,
The double pipe stock device (10) has a transfer means (11) for transferring the double pipe (1) to the axis adjustment device (20) and can be raised and lowered about a predetermined position (17b) as a fulcrum. consists of
The axial center adjustment device (20) includes a gripping mechanism (22, 23U, 23L) that always has an opening on the double pipe stock device (10) side through which the double pipe (1) can pass, and a axial center. A turning mechanism (26, 27) for turning the adjusted double pipe (1) toward the reader device (30),
A drilling device characterized in that the leader device (30) includes a slide mechanism (32) that moves the rotational drive device (40) laterally.