Drilling device and drilling method using thereof

Abstract

To improve the safety and efficiency of work to connect outer pipes and rods in a double-pipe drilling device.SOLUTION: A drilling device 10 comprises an outer tube unit 21, a rod unit 22 inserted inside the outer tube unit 21, a connecting outer tube 21b connected to the outer tube unit 21 to extend the outer tube unit 21, a connecting rod 22b connected to the rod unit 22 to extend the rod unit 22, a first rod holding device 16 that holds the connecting rod 22b to connect the connecting rod 22b to a drifter 13, a second rod holding device 17 that holds the rod unit 22 to connect the connecting rod 22b connected to the drifter 13 to the rod unit 22, and an outer tube holding device 18 that is provided between a first rod holding device 16 and a second rod holding device 17 and holds the connecting outer tube 21b to connect the connecting outer tube 21b to the outer tube unit 21.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a hole drilling device and a hole drilling method using the hole drilling device. [Background technology]

[0002] Patent Document 1 discloses a double-pipe multi-phase injection drilling system equipped with an injection pipe having a double-pipe structure consisting of an outer pipe and an inner pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-63652 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the double-pipe multi-phase injection drilling system disclosed in Patent Document 1, the injection pipes to be driven into the natural ground are sequentially connected. In the work of connecting the outer pipe and the inner pipe, the outer pipe and the inner pipe are heavy and the work is complicated, so the safety and efficiency of the work are required.

[0005] The present invention aims to improve the safety and efficiency of the work of connecting an outer tube and a rod in a drilling device with a double tube structure. [Means for solving the problem]

[0006] The present invention is a hole-drilling device, comprising: a guide shell; a bit for drilling a natural ground; an outer tube unit for propelling the bit together with the bit inside the hole drilled by the bit; a rod unit having the bit attached to its tip and inserted inside the outer tube unit; a drifter provided on the guide shell so as to be movable in the forward and backward directions and for driving the bit via the rod unit; a connecting outer tube connected to the outer tube unit to extend the outer tube unit; a connecting rod connected to the rod unit to extend the rod unit; and a connecting rod for connecting the connecting rod to the drifter. The drilling apparatus is equipped with a first rod gripping device for gripping the connecting rod, a second rod gripping device provided in front of the first rod gripping device on the guide shell for gripping the rod unit in order to connect the connecting rod connected to the drifter to the rod unit, and an outer tube gripping device provided between the first rod gripping device and the second rod gripping device on the guide shell for gripping the connecting outer tube in order to connect the connecting outer tube to the outer tube unit, and the connecting rod and connecting outer tube are sequentially connected to the rod unit and the outer tube unit, and the ground is drilled while the rod unit and the outer tube unit are extended. Effect of the Invention

[0007] According to the present invention, it is possible to improve the safety and efficiency of the operation of connecting an outer tube and a rod in a drilling device with a double tube structure. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram showing a cross section along the longitudinal direction of a tunnel of this embodiment and a side view of a work vehicle. [Diagram 2] 1 is a diagram showing a cross section of a tunnel of this embodiment when viewed from the tunnel face side toward the entrance and the front of a work vehicle. FIG. [Diagram 3] 1 is a schematic diagram of a drilling device according to an embodiment of the present invention. [Figure 4A] FIG. 2 is a top view of a first rod holding device according to the present embodiment. [Figure 4B] FIG. 2 is a front view of a first rod holding device according to the present embodiment. [Diagram 5]2 is a side view of a second rod holding device, a steel pipe holding device, and a steel pipe support member of the present embodiment. FIG. [Figure 6] FIG. 2 is a front view of a second rod holding device according to the present embodiment. [Figure 7] FIG. 2 is a front view of the steel pipe gripping device of the present embodiment. [Figure 8] FIG. 2 is a front view of the steel pipe support member of the present embodiment. [Figure 9] 1A to 1C are diagrams illustrating the steps of the hole drilling method of this embodiment. [Figure 10] 1A to 1C are diagrams illustrating the steps of the hole drilling method of this embodiment. [Figure 11] 1A to 1C are diagrams illustrating the steps of the hole drilling method of this embodiment. [Figure 12] 1A to 1C are diagrams illustrating the steps of the hole drilling method of this embodiment. [Figure 13] 5A and 5B are diagrams illustrating an example of a connection portion in the outer pipe unit of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0010] FIG. 1 is a diagram showing a cross section along the longitudinal direction of the tunnel T of this embodiment and a side view of the work vehicle 1. FIG. 2 is a diagram showing a cross section of the tunnel T of this embodiment when viewed from the face S side toward the entrance direction, and a front view of the work vehicle 1. FIG. 3 is a schematic diagram of a drilling device 10. The work vehicle 1 of this embodiment is used, for example, when carrying out a ground reinforcement method such as a pre-supporting work for reinforcing the ground M during excavation of the tunnel T. Specifically, the work vehicle 1 is used in a ground reinforcement method (injection-type long-length pre-supporting method) in which a reinforcing pipe P is inserted into the hole H while drilling a hole H with a drilling bit 12, and then a cement-based or resin-based solidifying material is injected from inside the reinforcing pipe P to leave the reinforcing pipe P in the ground M in front of the face S for reinforcement (see FIG. 1 and FIG. 2). Specifically, a plurality of reinforcing pipes P are cast in an arch shape along the circumferential direction of the tunnel T at the top end in front of the face S of the tunnel T (see FIG. 2). The reinforcing pipe P is driven from the top of the tunnel face S toward the ground M ahead at a specified elevation angle (see Figure 1). The inner wall of the tunnel T is covered with a lining concrete C.

[0011] First, the configuration of the work vehicle 1 will be described.

[0012] As shown in Figures 1 and 2, the work vehicle 1 comprises a base 2, a plurality of arms 3 pivotally supported on the base 2, a plurality of booms 4 pivotally supported on the base 2, a drilling device 10 pivotally supported on the tip of each of the arms 3, and a work platform 5 pivotally supported on the tip of each of the booms 4.

[0013] The base 2 has a drive source such as an engine or a motor (not shown), wheels 2a driven by the drive source, an operation console 2b for operating the work vehicle 1, and outriggers 2c. The work vehicle 1 can move freely within the tunnel T by driving the wheels 2a. Note that crawlers may be provided instead of the wheels 2a.

[0014] The arm 3 and the boom 4 are telescopic and extendable. The arm 3 and the boom 4 swing vertically relative to the base 2 by extending and retracting the hydraulic cylinders 3a, 4a. Although not shown, the work vehicle 1 also includes a hydraulic cylinder that swings the arm 3 and the boom 4 horizontally relative to the base 2, and a hydraulic cylinder that extends and retracts the arm 3 and the boom 4.

[0015] The extension and swinging of the arm 3 and the boom 4 are performed by an operator operating a lever or the like on the operation table 2b. The extension and swinging of the arm 3 and the boom 4 may be controlled on the work table 5.

[0016] Next, a specific configuration of the hole drilling device 10 will be described with reference to Fig. 3. Fig. 3 shows the arm 3 in its most contracted state.

[0017] As shown in Figure 3, the drilling device 10 comprises a guide shell 11 pivoted to the tip of the arm 3, a bit 12 for drilling a hole in the ground M, a double tube section 20 to which the bit 12 is attached at its tip, and a drifter 13 for driving the bit 12 via the double tube section 20.

[0018] 3, the guide shell 11 has a main body 11a and a carriage 11b. The main body 11a is a long rod-shaped member. The drifter 13 is placed on the carriage 11b and is provided so as to be movable in the longitudinal direction of the guide shell 11 (main body 11a).

[0019] The guide shell 11 is pivotally supported (connected) to one end (tip) of the arm 3 via a guide shell support member 7 so as to be able to swing freely. A hydraulic cylinder 14 is provided between the arm 3 and the guide shell support member 7. The hydraulic cylinder 14 can swing the guide shell 11 at the tip portion of the arm 3.

[0020] The guide shell 11 is slidable in the longitudinal direction of the main body 11a relative to the guide shell support member 7. The guide shell 11 moves in the longitudinal forward direction (away from the base 2) when the hydraulic cylinder 15 is extended, and moves in the longitudinal rearward direction (approaching the base 2) when the hydraulic cylinder 15 is contracted. In this embodiment, the face S side is defined as the "front" and the entrance side of the tunnel T is defined as the "rear", and the guide shell 11 moves toward the face S in the tunnel axial direction. They are opposed to each other and can move in the forward and backward directions.

[0021] As shown in Figure 12, the double tube section 20 has an outer tube unit 21 having a bit 12 attached to its tip and propelling the outer tube unit 21 together with the bit 12 inside the hole H drilled by the bit 12, and a rod unit 22 having a bit 12 attached to its tip and inserted inside the outer tube unit 21.

[0022] In the drilling device of this embodiment, the diameter of the bit 12 is, for example, about 100 mm to 125 mm. The outer diameter of the bit 12 is set to a value slightly larger than the outer diameter of the outer tube unit .

[0023] As shown in FIG. 11 and other figures, the outer pipe unit 21 has a base outer pipe 21a with a bit 12 attached to its tip, and a connecting outer pipe 21b connected in sequence to the base end (rear end) side of the base outer pipe 21a. The base outer pipe 21a and the connecting outer pipe 21b are made of steel pipes or resin pipes. That is, the base outer pipe 21a and the connecting outer pipe 21b are hollow pipes. In this embodiment, the length of the base outer pipe 21a and the connecting outer pipe 21b is set to, for example, about 3 to 4 m. The bit 12 is rotatably attached to the tip of the base outer pipe 21a. In addition, a plurality of through holes (not shown) made of fine holes are provided in the pipe walls of the base outer pipe 21a and the connecting outer pipe 21b. In this embodiment, the base outer pipe 21a and the connecting outer pipe 21b inserted into the natural ground M, i.e., the outer pipe unit 21, correspond to a reinforcing pipe P that is placed in the natural ground M and reinforces the natural ground M.

[0024] The rod unit 22 has a base rod 22a with a bit 12 attached to its tip, and a connecting rod 22b connected to the base end (rear end) side of the base rod 22a. The base rod 22a and the connecting rod 22b are made of a metal solid rod-shaped member, a hollow rod-shaped member, or the like, and the base end of the base rod 22a and the tip of the connecting rod 22b are connected. The bit 12 is attached to the tip of the base rod 22a by screw fastening. The base end of the base rod 22a is provided with a socket portion 22c (see Figures 9, 10, etc.) having an internal thread. The connecting rod 22b has an external thread 22d (see Figures 9, 10, etc.) formed on one end (tip) side, and a socket portion 22e (see Figures 9, 10, etc.) having an internal thread formed on the other end (rear) side. The base end (rear end) side (socket portion 22e) of the rod unit 22 is connected to the drive shaft 13a of the drifter 13. The overall length of the rod unit 22 is longer than the overall length of the outer tube unit 21. In other words, the base end side of the rod unit 22 protrudes from the base end side of the outer tube unit 21.

[0025] Thus, the double tube section 20 of this embodiment has a double tube structure consisting of a base outer tube 21a, a connecting outer tube 21b, and a base rod 22a and a connecting rod 22b inserted inside the base outer tube 21a and the connecting outer tube 21b.

[0026] As shown in Figure 3, the drilling device 10 is provided on the guide shell 11 and further includes a first rod holding device 16 that holds the connecting rod 22b, a second rod holding device 17 that holds the base rod 22a or the connecting rod 22b inserted into the ground M, an outer tube holding device 18 that holds the connecting outer tube 21b, and outer tube support members 19a, 19b (tube support portion) that support the connecting outer tube 21b.

[0027] As shown in Fig. 4A etc., the first rod holding device 16 is attached to the drifter 13. The first rod holding device 16 is attached so as to be movable in the front-rear direction relative to the drifter 13. Furthermore, as shown in Fig. 4B etc., the first rod holding device 16 has a pair of holding parts 16a driven by a hydraulic cylinder (not shown).

[0028] The first rod holding device 16 holds the rear end side of the connecting rod 22b supported on the guide shell 11 by the pair of holding parts 16a, specifically by closing the pair of holding parts 16a, so that the connecting rod 22b cannot rotate or move. The first rod holding device 16 can open the pair of holding parts 16a to a distance greater than the outer diameter of the connecting outer tube 21b (see FIG. 4B). As a result, when the pair of holding parts 16a are open, the first rod holding device 16 does not hinder the movement of the connecting outer tube 21b in the front-rear direction.

[0029] As shown in Fig. 3 etc., the second rod holding device 17 is provided forward of the first rod holding device 16 on the guide shell 11, specifically, at the tip of the guide shell 11. Also, as shown in Fig. 6, the second rod holding device 17 has a pair of holding parts 17a driven by a hydraulic cylinder (not shown).

[0030] The second rod gripping device 17 grips the base rod 22a inserted in the ground M or the rear end side (near the socket portion 22e) of the connecting rod 22b inserted in the ground M so as to be unrotatable and unmovable by closing the pair of gripping parts 17a. The second rod gripping device 17 can also open the pair of gripping parts 17a to a distance greater than the outer diameter of the connecting outer tube 21b (see FIG. 6). As a result, when the pair of gripping parts 17a are open, the second rod gripping device 17 does not hinder the movement of the connecting outer tube 21b in the front-rear direction.

[0031] 3 and 5, the outer tube gripping device 18 is provided between the first rod gripping device 16 and the second rod gripping device 17 on the guide shell 11, more specifically, adjacent to the second rod gripping device 17. As shown in Fig. 7, the outer tube gripping device 18 has a pair of gripping portions 18a driven by a hydraulic cylinder (not shown).

[0032] As shown in Figs. 3 and 5, the outer tube gripping device 18 grips the connecting outer tube 21b supported on the guide shell 11 so as to be unrotatable and unmovable by closing the pair of gripping portions 18a.

[0033] As shown in Fig. 3 etc., the outer tube support members 19a, 19b are disposed between the outer tube holding device 18 and the first rod holding device 16 on the guide shell 11. The outer tube support member 19a is provided so as to be movable in the front-rear direction on the guide shell 11. The outer tube support member 19a moves in the front-rear direction of the guide shell 11 by driving a hydraulic actuator (not shown). The outer tube support member 19b is provided near the outer tube holding device 18 on the guide shell 11 so as to be immovable.

[0034] The drifter 13 has a rotation mechanism (not shown) driven by a hydraulic motor (not shown) and a hydraulic impact piston (not shown). The rotation mechanism is driven by a hydraulic motor and applies a rotational force to the bit 12 via the rod unit 22. The rotation mechanism is configured so that the rotation speed and rotation direction can be controlled. The impact piston applies an impact force to the bit 12 via the rod unit 22. The impact piston is arranged coaxially with the rod unit 22 and repeatedly collides with the base end side of the rod unit 22 to apply an impact force in the axial direction (front-rear direction) of the rod unit 22 to the bit 12. The rotational force and impact force generated by the drifter 13 are transmitted to the bit 12 via the rod unit 22. The bit 12 digs the hole H drilled in the natural ground M deeper by the rotational force and impact force applied by the drifter 13.

[0035] In the work vehicle 1, the hole H to be formed in the natural ground M is drilled while connecting and extending the connecting outer pipe 21b and the connecting rod 22b to the outer pipe unit 21 and the rod unit 22, respectively. In this embodiment, the hole H is drilled to a length corresponding to three connecting outer pipes 21b and three connecting rods 22b connected to the base outer pipe 21a and the base rod 22a. The number of connecting outer pipes 21b and connecting rods 22b connected may be two or four or more.

[0036] Here, the drilling method using the hole-drilling device 10 will be specifically described with reference to Figs. 9-12. Figs. 9-12 show the steps of the hole-drilling method using the hole-drilling device 10 in chronological order. In the following, the rotation direction of the rotation mechanism that rotates the bit 12 is called "forward rotation" and the opposite rotation direction is called "reverse rotation." The "forward rotation" direction is the direction in which the connection between the base rod 22a and the connecting rod 22b and the connection between the connecting rods 22b are not loosened when drilling a hole in the natural ground M, that is, the direction in which they are fastened. The "reverse rotation" direction can be said to be the direction in which the connection between the base rod 22a and the connecting rod 22b and the connection between the connecting rods 22b are loosened, that is, the direction in which they are released from fastening.

[0037] First, in the state shown in step (A) of Fig. 9, the base outer tube 21a and the base rod 22a are supported on the guide shell 11 of the hole drilling device 10. In the state shown in Fig. 9(A), the base end side (socket part 22c) of the base rod 22a is connected by a screw connection to a male screw formed on the tip of the drive shaft 13a of the drifter 13. In addition, the first rod holding device 16, the second rod holding device 17, and the outer tube holding device 18 are all in a released state (unclamped state).

[0038] From the state shown in step (A) of FIG. 9, while advancing the drifter 13, the rotation mechanism and the impact piston are driven to impart torque and / or impact force in the forward rotation direction to the bit 12 via the base rod 22a, thereby drilling a hole in the natural ground M. In the drilling device 10 of this embodiment, since the bit 12 is attached to the tip of the base outer tube 21a, when the bit 12 advances through the natural ground M, the base outer tube 21a advances into the hole H, being pulled along by the bit 12. Then, when the base outer tube 21a advances to a predetermined length into the natural ground M (see step (B) of FIG. 9), the driving of the drifter 13 is stopped. The bit 12 may be attached only to the base rod 22a. In other words, the bit 12 and the base outer tube 21a do not have to be connected to each other.

[0039] Then, the rear end of the base rod 22a is clamped by the first rod holding device 16, the drifter 13 of the hole drilling device 10 is rotated in the reverse direction, the screw fastening between the base rod 22a and the drive shaft 13a of the drifter 13 is released, and the drifter 13 is retracted to the rear end of the guide shell 11. At this time, the hydraulic cylinder 15 may be contracted to retract the guide shell 11. (See step (C) in FIG. 9).

[0040] Then, the arm 3 is contracted to move the guide shell 11 to the vicinity of the storage shelf 6. Then, the connecting outer pipe 21b and the connecting rod 22b stored on the storage shelf 6 (see FIG. 2) on the ground are supported on the guide shell 11, specifically, the connecting outer pipe 21b is supported by the outer pipe holding device 18 and the outer pipe support members 19a, 19b, with the connecting rod 22b inserted into the hollow part of the connecting outer pipe 21b. After that, the arm 3 is extended and swung to move the guide shell 11 so that the leading ends of the connecting outer pipe 21b and the connecting rod 22b to be connected face the rear ends of the base outer pipe 21a (outer pipe unit 21) and the base rod 22a (rod unit 22) inserted into the ground M (see step (D) in FIG. 10). At this time, the connecting outer pipe 21b may be held by the outer pipe holding device 18.

[0041] Next, the drifter 13 is advanced to clamp the rear end side (socket portion 22e) of the connecting rod 22b to be connected by the first rod gripping device 16 (see step (E) in FIG. 10).

[0042] Then, with the connecting rod 22b connected by the first rod holding device 16 clamped, the drifter 13 is advanced and the drive shaft 13a of the drifter 13 is rotated forward, whereby the connecting rod 22b and the drive shaft 13a of the drifter 13 are screwed together (see step (F) in FIG. 10).

[0043] Next, the arm 3 is driven to move the guide shell 11 forward, and then the rear end of the base rod 22a (rod unit 22) inserted into the natural ground M is gripped by the second rod gripping device 17 (see step (G) in FIG. 11).

[0044] Then, with the base rod 22a connected to the second rod holding device 17 clamped, the drifter 13 is advanced and the drive shaft 13a of the drifter 13 is rotated forward. As a result, the female thread formed in the socket portion 22c of the base rod 22a inserted into the ground M and the male thread formed at the tip of the connecting rod 22b are screwed together. That is, the base end side of the base rod 22a and the tip side of the connecting rod 22b are connected together (see step (H) in FIG. 11).

[0045] Thereafter, the clamping of the base rod 22a by the second rod holding device 17 is released, and in a state where the connecting outer tube 21b to be connected is held by the outer tube holding device 18, the hydraulic cylinder 15 is extended to move the guide shell 11 forward. More specifically, the guide shell 11 is moved forward in the longitudinal direction relative to the guide shell support member 7. As the guide shell 11 moves forward, the carriage 11b on which the drifter 13 is placed moves relatively backward. This connects the connecting outer tube 21b to the base outer tube 21a. The base outer tube 21a and the connecting outer tube 21b, and the connecting outer tubes 21b are connected to each other by press-fitting. This completes the connection between the base outer tube 21a and the connecting outer tube 21b, and between the base rod 22a and the connecting rod 22b (see step (I) in FIG. 11). 13, the base outer tube 21a and the connecting outer tube 21b, and the connecting portions between the connecting outer tubes 21b are press-fitted by fitting one tip 21c into the other recess 21d. A plurality of barbs 21e, 21f for preventing slipping out are provided on the outer peripheral surface of the tip 21c and the inner peripheral surface of the recess 21d.

[0046] In this way, when the connections between the base outer pipe 21a (outer pipe unit 21) and the connecting outer pipe 21b, and between the base rod 22a (rod unit 22) and the connecting rod 22b are completed, the clamping of the connecting outer pipe 21b by the outer pipe holding device 18 is released. Thereafter, the rotation mechanism and the striking piston of the drifter 13 are driven to move the drifter 13 forward, while the rotation mechanism and the striking piston are driven to rotate the bit 12 in the positive direction or to strike the bit 12 via the base rod 22a, thereby further drilling the natural ground M.

[0047] Then, when the outer pipe unit 21 and the rod unit 22 are inserted into the ground M to a predetermined length (see step (J) in FIG. 12), the driving of the drifter 13 is stopped. After that, a new connecting outer pipe 21b and connecting rod 22b are again connected to the outer pipe unit 21 (connecting outer pipe 21b inserted into the ground M) and the rod unit 22 (connecting rod 22b inserted into the ground M), thereby extending the outer pipe unit 21 and the rod unit 22. The method of further extending the connecting outer pipe 21b and connecting rod 22b is the same as in steps (D) to (I) above, and therefore will not be described.

[0048] After the drilling operation by the hole drilling device 10 is completed, a cement-based or resin-based consolidating material is injected between the inner peripheral surface of the hole H in the ground M and the outer peripheral surface of the outer pipe unit 21 through the pores of the outer pipe unit 21 (the base outer pipe 21a and the connecting outer pipe 21b) to fix the outer pipe unit 21 (reinforcing pipe P) to the ground M. By fixing the outer pipe unit 21 (reinforcing pipe P) to the ground M in this way, the restraining effect of the ground M in front of the face S is enhanced, and when the excavation operation proceeds from the face S, the collapse of the top of the excavation can be prevented. Note that it is preferable that the bit 12 and the rod unit 22 are pulled out from inside the outer pipe unit 21 before the consolidating material is injected.

[0049] The hole drilling device 10 configured as above provides the following advantages.

[0050] In the drilling device 10 of this embodiment, the base rod 22a, the connecting rod 22b, and the connecting outer tube 21b are appropriately held on the guide shell 11 by the first rod holding device 16, the second rod holding device 17, and the outer tube holding device 18, so that a new connecting outer tube 21b and connecting rod 22b can be connected on the guide shell 11. This eliminates the need for an operator to move or rotate the connecting outer tube 21b and the connecting rod 22b, thereby improving the safety and efficiency of the work of connecting the connecting outer tube 21b and the connecting rod 22b.

[0051] In addition, in the drilling device 10, the base outer pipe 21a and the connecting outer pipe 21b, and the connecting outer pipes 21b themselves can be connected by press-fitting. This makes it easier to connect the base outer pipe 21a and the connecting outer pipe 21b, or the connecting outer pipes 21b themselves, compared to, for example, connecting the base outer pipe 21a and the connecting outer pipe 21b and the connecting outer pipes 21b themselves by screw coupling. This makes it possible to further improve the safety and efficiency of the work. Note that the connection between the base outer pipe 21a and the connecting outer pipe 21b, and the connecting outer pipes 21b themselves is not limited to press-fitting, and may be a method of connecting one pipe to the other by pressing and inserting (inserting while pressing with a slight force), a configuration similar to a so-called one-touch joint or pin joint (a joint having a structure to prevent slipping out by a pin).

[0052] Furthermore, since the drilling device 10 is provided with outer pipe supporting members 19a, 19b (pipe supporting portions) that support the connecting outer pipe 21b, the connecting outer pipe 21b can be supported on the guide shell 11 in a stable manner.

[0053] Although the embodiments of the present invention have been described above, the above-mentioned embodiments merely show some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above-mentioned embodiments.

[0054] In the above embodiment, an example was described in which the drilling device 10 was used to carry out ground reinforcement methods such as pre-reinforcing work to reinforce the ground M, but the present invention is not limited to this and can also be used, for example, for drilling long holes in the ground M for loading explosives.

[0055] It is not always necessary to provide both of the outer pipe supporting members 19a, 19b (pipe supporting portions).

[0056] Also, for example, a device (outer tube gripping device moving mechanism) may be provided that moves the outer tube gripping device 18 in the longitudinal direction (front-rear direction) relative to the guide shell 11. As a result, for example, in step (I) of Fig. 10, the outer tube gripping device 18 can be advanced by the outer tube gripping device moving mechanism without moving the guide shell 11, thereby connecting the base outer tube 21a and the connecting outer tube 21b, or connecting outer tubes 21b together. Note that, for example, a hydraulic cylinder can be used as a specific driving means for the outer tube gripping device moving mechanism.

[0057] The above-mentioned drilling device 10 can be applied to, for example, a configuration including only the outer tube unit 21 (a configuration not including the rod unit 22). Even in the case of such a single tube structure, the outer tube is heavy and the work is complicated, so safety and efficiency of the work are required. Therefore, by using the drilling device 10 of this embodiment, the worker does not need to move or rotate the connecting outer tube 21b, so that the safety and efficiency of the work of connecting the connecting outer tube 21b can be improved. Furthermore, by connecting the connecting outer tube 21b to the outer tube unit 21 by press-fitting, the safety and efficiency of the work can be further improved. In this case, the drilling device 10 does not necessarily need to be provided with the first rod holding device 16 and the second rod holding device 17. [Explanation of symbols]

[0058] 1 work vehicle, 2 base body, 3 arm, 4 boom, 5 work platform, 6 storage shelf, 10 drilling device, 11 guide shell, 11a main body, 11b carriage, 12 bit, 13 drifter, 13a drive shaft, 16 first rod gripping device, 17 second rod gripping device, 18 outer tube gripping device, 19a outer tube support member (tube support part), 19b... outer pipe support member (pipe support part), 20... double pipe part, 21... outer pipe unit, 21a... base outer pipe, 21b... connecting outer pipe, 22... rod unit, 22a... base rod, 22b... connecting rod, 22c... socket part, 22d... male thread, 22e... socket part, H... hole, M... natural ground, P... reinforcing pipe, S... face, T... tunnel

Claims

1. A guide shell; A bit for drilling holes in the natural ground, an outer tube unit that propels the bit together with the bit through the inside of the hole drilled by the bit; a rod unit having the bit attached to a tip thereof and being inserted into the outer tube unit; a drifter provided on the guide shell so as to be movable in a forward and backward direction and configured to drive the bit via the rod unit; a connecting outer pipe connected to the outer pipe unit to extend the outer pipe unit; a connecting rod connected to the rod unit for extending the rod unit; a first rod gripping device for gripping the connecting rod to connect the connecting rod to the drifter; a second rod gripping device provided on the guide shell in front of the first rod gripping device and configured to grip the rod unit in order to connect the connecting rod connected to the drifter to the rod unit; an outer tube gripping device provided on the guide shell between the first rod gripping device and the second rod gripping device, the outer tube gripping device gripping the connecting outer tube to connect the connecting outer tube to the outer tube unit; A drilling device that sequentially connects the connecting rod and the connecting outer pipe to the rod unit and the outer pipe unit, and drills a hole in the natural ground while extending the rod unit and the outer pipe unit.

2. 2. The drilling device according to claim 1, A drilling device in which the connecting outer pipe and the outer pipe unit are connected by press-fitting or by pushing one into the other.

3. A drilling device according to claim 1 or 2, The drilling apparatus further includes an outer tube gripping device moving mechanism that moves the outer tube gripping device on the guide shell in the longitudinal direction of the guide shell.

4. A drilling device according to claim 1 or 2, A hole drilling device, wherein the overall length of the rod unit is longer than the overall length of the outer tube unit.

5. A drilling device according to claim 1 or 2, A drilling device further comprising a pipe support portion disposed between the outer tube holding device and the first rod holding device on the guide shell and supporting the connecting outer tube.

6. A method for drilling a hole using the drilling device according to claim 1 or 2, gripping the connecting rod with the first rod gripping device; connecting the connecting rod to the drifter; gripping the rod unit by the second rod gripping device; a step of releasing the grip of the connecting rod by the first rod gripping device while the rod unit is gripped by the second rod gripping device, and driving the drifter to connect the connecting rod to the rod unit; a step of releasing the grip of the rod unit by the second rod gripping device, and advancing the guide shell in a state in which the connecting outer tube is gripped by the outer tube gripping device, thereby connecting the connecting outer tube to the outer tube unit; a step of releasing the grip of the connecting outer tube by the outer tube gripping device; and driving the bit by driving the drifter to drill a hole in the natural ground.

7. A method for drilling a hole using the drilling device according to claim 1 or 2, gripping the connecting rod with the first rod gripping device; connecting the connecting rod to the drifter; gripping the rod unit by the second rod gripping device; a step of releasing the grip of the connecting rod by the first rod gripping device while the rod unit is gripped by the second rod gripping device, and driving the drifter to connect the connecting rod to the rod unit; a step of releasing the grip of the rod unit by the second rod gripping device, and advancing the outer tube gripping device while the connecting outer tube is being gripped by the outer tube gripping device, thereby connecting the connecting outer tube to the outer tube unit; a step of releasing the grip of the connecting outer tube by the outer tube gripping device; and driving the bit by driving the drifter to drill a hole in the natural ground.

Images