JPH09250284A - Drilling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide both of sure flushing operation in drilling by a chronen bit and of easy releasing from a driven shoe in completing of the drilling. SOLUTION: A drive shoe 20 is coupled with the front end in the drilling direction (A) of a casing pipe 10 and a chronen bit 30 is loosely engaged with the inside of the front end in the drilling direction (A) of the driven shoe 20. The chronen bit 30 is coupled with the driven shoe 20 by a lock pin 33 and a pin presser jig 34 in drilling in such a state as not being allowed relative rotation along the circumferential direction neither relative movement along the drilling direction (A). The chronen bit 30 is released from its coupling with the driven shoe 20 by recovering of the pin presser jig 34 by a covering jig 40 and falling of the lock pin 33 by an energyzing force of a pin energyzing spring 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing single pipe punching device having a detachable Kronen bit at its tip, and more particularly to a reliable flushing operation during drilling of a Kronen bit and a drive at the completion of drilling. The present invention relates to a structure for achieving both easy release from a shoe.

[0002]

2. Description of the Related Art Generally, as shown in FIG.
(Direction of arrow A) Kronen bit 51 fitted to the front end
Is rotated while being advanced along the perforation direction to perform perforation. The Kronen bit 51 is connected to the drive shoe 50 so as to be relatively non-rotatable along the circumferential direction and is not movable relative to the drive shoe 50 along the drilling direction. Driven to rotate. Further, with the retreat of the drive shoe 50 in the direction opposite to the drilling direction of the drive shoe 50, the connection with the drive shoe 50 is released, and the krone bit 51 is separated from the drive shoe 50. Thereby, the spouting of groundwater after drilling is prevented.

[0003] In such a drilling device, when performing a normal drilling operation, it is sufficient to rotate the kronen bit 51 while making it advance in the drilling direction. On the other hand, when the kronen bit 51 being drilled hits a boulder or a hard layer, the klonen bit 51 is once retracted in the direction opposite to the drilling direction, and then is advanced again in the drilling direction, that is, the flushing operation. It is preferred to do so.

However, in the drilling device shown in FIG. 13, if the drive shoe 50 is retracted in the direction opposite to the drilling direction, the kronen bit 51 falls off the drive shoe 50. For this reason, there was a problem that the flushing operation could not be performed, a large amount of time was required for the drilling operation, and the drilling efficiency was significantly reduced.

Conventionally, as a punching device which solves the above-mentioned problem, Japanese Patent Application Laid-Open No. Hei 4-261996 discloses FIG.
As shown in FIG. 2, a configuration in which a pair of projecting members 61 are provided at the rear end (right end in FIG. 14) of the kronen bit 60 in the drilling direction A is described. Each projecting member 61 is connected to the rear end of the Kronen bit 60 in the drilling direction A via a supporting member 62, and is connected to each other via a connecting pin 64 loosely fitted in the long hole 63. I have.

That is, in the state shown by the solid line in FIG. 14 in which each overhang member 61 is held in line with the other overhang member 61, the upper and lower ends in FIG. Mated. Thereby, the overhang member 6
Reference numerals 1 respectively connect the kronen bit 60 to the drive shoe 65 so as not to be relatively rotatable along the circumferential direction and to be relatively immovable along the drilling direction A. In addition, each overhang member 6
Each of the reference numerals 1 is displaced to a state shown by a two-dot chain line in FIG. 14 when receiving an external force in the vicinity of the connecting pin 64 along the drilling direction A. As a result, the respective projecting members 61 have their upper and lower ends in FIG. 14 removed from the locking grooves 66 of the drive shoe 65, respectively.
The Kronen bit 60 can be detached from the drive shoe 65.

[0007]

In the conventional drilling apparatus shown in FIG. 14 described above, at the time of drilling, the protruding members 61 are fitted into the locking grooves 66 of the drive shoes 65 so that the kronen bit 60 is moved. The drive shoe 65 is connected to the drive shoe 65 so that it cannot rotate relatively in the circumferential direction and cannot move relatively in the drilling direction A. Therefore, a flushing operation is possible. When the drilling is completed, an external force along the drilling direction A is applied to the vicinity of the connecting pin 64 of each overhanging member 61, so that the locking groove 6 of each overhanging member 61 and the drive shoe 65 is formed.
6 can be released, and the kronen bit 60 can be detached from the drive shoe 65.

However, the connection between the Kronen bit 60 and the drive shoe 65 at the time of drilling is incomplete. That is, the projecting member 61 is disengaged from the locking groove 66 of the drive shoe 65 due to, for example, the impact vibration of a hydraulic drifter (not shown) on the drilling machine (not shown) connected to the rear end of the casing pipe 52 in the drilling direction A. As a result, there is a possibility that the kronen bit 60 being drilled may fall off the drive shoe 65.

According to the present invention, the flushing operation of the Kronen bit during drilling can be surely performed without causing dropout of the Kronen bit, and at the completion of drilling, the Kronen bit is easily detached from the drive shoe. An object of the present invention is to provide a punching device that can be used.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hollow cylindrical casing, a hollow cylindrical drive shoe connected to a front end of the casing in a drilling direction, and a hollow cylindrical drive end. In a punching device including a kronen bit loosely fitted to a front end in a drilling direction of a shoe, a locking portion provided on the drive shoe, and a position corresponding to the locking portion at a base end of the kronen bit. And the through-hole is inserted through the through-hole from the inside of the base end of the Kronen bit and is detachably fitted to the locking portion, so that the Kronen bit cannot be rotated relative to the drive shoe in the circumferential direction. A locking pin that is connected to the locking pin so as to be relatively immovable along the drilling direction, and is detachably fitted inside the base end of the kronen bit, and the locking pin is fitted to the locking portion. Keep in A hollow cylindrical pin pressing member, an urging member interposed between the locking pin and the base end of the Kronen bit, and constantly urging the locking pin in a direction away from the locking portion; With the advance and retreat along the direction opposite to the drilling direction, the pin holding member is separated from the inside of the base end of the kronen bit and collected, so that the locking pin is locked by the urging force of the urging member. And a recovery member that is detached from the punching device.

[0011]

In the drilling device according to the present invention, at the time of drilling, the locking pin is held by the pin pressing member so as to pass through the through hole of the kronen bit and fitted to the locking portion of the drive shoe. You. That is, the connection between the kronen bit and the drive shoe is held by the locking pin and the pin pressing member. As a result, the kronen bit is connected to the drive shoe so that it cannot rotate relative to the drive shoe in the circumferential direction and cannot move relative to the drive shoe in the drilling direction, so that falling off due to the flushing operation can be reliably prevented.

When the drilling is completed, the locking pin is separated from the locking portion by the urging force of the urging member, because the pin holding member is separated from the inside of the base end of the krone bit by the collecting member and collected. Is done. That is, the connection between the kronen bit and the drive shoe is released by the recovery of the pin pressing member by the recovery member and the detachment of the locking pin from the locking portion by the urging force of the urging member. Thereby, the Kronen bit is easily detached from the drive shoe.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. 1 to 7 are views showing a punching device according to an embodiment of the present invention, FIG. 1 is a cross-sectional view showing the entire punching device, and FIG. 2 is a cross-sectional view taken along the arrow B in FIG. FIG.
Is a side view showing the pin holding jig, and FIG. 4 is a cross-sectional view taken along the arrow C in FIG. FIG. 5 is a side view showing a recovery jig.
FIG. 6 is a cross-sectional view taken along the arrow D in FIG. 5, and FIG. 7 is a side view showing the blade of the recovery jig.

FIGS. 8 to 12 are schematic sectional views showing respective operating states of the perforating apparatus shown in FIG. That is, FIG. 8 shows a state at the time of perforation, FIG. 9 shows a state where the perforation is completed and the collection jig starts to advance, FIG.
FIG. 11 shows a state where the collecting jig is retracted and the pin holding jig is collected, and FIG. 12 shows a state where the casing pipe is retracted and the Kronen bit falls off.

1 and 2, a drive shoe 20 is connected to a front end (left end in FIG. 1) of the casing pipe 10 in the drilling direction A, and a front end of the drive shoe 20 in the drilling direction A (direction of arrow A). A kronen bit 30 is loosely fitted inside (left end in FIG. 1).

The casing pipe 10 is formed in a hollow cylindrical shape, and the rear end of the drilling direction A (not shown) is attached to a drilling machine (not shown).

The drive shoe 20 is formed in a hollow cylindrical shape. At a predetermined position in the drive shoe 20 along the drilling direction A, a pair of locking holes 21 are provided diametrically opposed.

The Kronen bit 30 has a proximal end 31 formed in a hollow cylindrical shape loosely fitted inside the front end of the drive shoe 20 in the drilling direction A, and the drilling direction of the base end 31 and the drive shoe 20. An O-ring 38 is interposed between the A rear end (the right end in FIG. 1) and the outer peripheral surface. A pair of through holes 32 corresponding to the locking holes 21 of the drive shoe 20 are provided at the base end portion 31 of the Kronen bit 30 at positions respectively communicating with the locking holes 21 in the diametrical direction.

At the time of drilling, the Kronen bit 30 cannot be relatively rotated along the circumferential direction of the drive shoe 20 and cannot be relatively moved along the drilling direction A by the locking pin 33 and the pin holding jig 34. Linked to When the drilling is completed, the Kronen bit 30 is connected to the drive shoe 20 by the collection of the pin holding jig 34 by the collection jig 40 and the falling off of the locking pin 33 by the urging force of the pin urging spring 35. It is released.

A pair of locking pins 33 are provided corresponding to the respective locking holes 21 of the drive shoe 20. Each of the locking pins 33 penetrates the through hole 32 of the kronen bit 30 in a state where the base end (lower end in FIG. 1) is loosely fitted in a pin holding groove 36 of the pin holding jig 34 which will be described later. The distal end (upper end in FIG. 1) is detachably fitted into the locking hole 21. Thereby, the locking pins 33 respectively connect the kronen bit 30 to the drive shoe 20 so as not to be relatively rotatable along the circumferential direction and to be relatively immovable along the drilling direction A.

The pin urging spring 35 is provided for each locking pin 3.
3 and the inner peripheral surface of the proximal end 31 of the kronen bit 30. Pin biasing spring 35
Respectively, always urge each locking pin 33 inward of the base end portion 31 of the Kronen bit 30, that is, in the direction of detachment from the locking hole 21.

As shown in FIGS. 1 to 4, the pin holding jig 34 is formed in a hollow cylindrical shape, and is detachably fitted inside the base end 31 of the kronen bit 30.
On the outer peripheral surface of the pin holding jig 34, a pair of pin receiving grooves 36 corresponding to the respective locking pins 33 are provided at predetermined positions in the circumferential direction communicating with the through holes 32 and the locking holes 21 along the diametrical direction. The opening is formed at the front end (left end in FIG. 1) in the drilling direction. The base ends of the corresponding locking pins 33 are loosely fitted in the respective pin receiving grooves 36. Pin holding jig 34
Holds each locking pin 33 in a predetermined posture such that the tip of the locking pin 33 loosely fitted in each pin accommodation groove 36 is fitted in the locking hole 21 of the drive shoe 20. .

At the rear end (right end in FIG. 1) of the pin holding jig 34 in the drilling direction A, a projection 37 is formed which protrudes inward by a predetermined amount. When the recovery jig 40 is retracted in the direction opposite to the punching direction A, the protrusions 37
1, 42 are engaged.

Referring to FIG. 1, FIG. 5 and FIG. 6, the collection jig 40 is moved forward and backward along the drilling direction A and the direction opposite to the drilling direction A, so that the pin holding jig 34 is closed. The base 30 is separated from the inside of the base end 31 and collected. That is, the recovery jig 40 is advanced in the perforation direction A into the pin holding jig 34 and then retracted in the direction opposite to the perforation direction A. The collection jig 40 engages the blades 41, 42 in the engagement grooves of the pin holding jig 34 with the retreat, thereby moving the pin holding jig 34 to the blades 41, 4.
2 and are interlocked in the direction opposite to the perforation direction A to be separated from the inside of the base end portion 31 of the kronen bit 30 and collected.

Referring to FIG. 1, FIG. 5 to FIG.
1 and 42 are a blade 41 protruding upward in FIG. 1 on the outer peripheral surface of the recovery jig 40 and a blade 42 protruding downward in FIG.
Are connected by a connecting pin 43. Each wing 4
A spring 44 is provided between the right end portions 1 and 42 in FIG. Each of the blades 41 and 42 is pressed inward by an external force from a position (hereinafter, referred to as a protruding position) projecting from the outer peripheral surface of the recovery jig 40 into the recovery jig 40, thereby attaching the spring 44. It can be displaced from the protruding position to a position slightly retracted inward (hereinafter referred to as a retracted position) against the force.

That is, the recovery jig 40 is provided with each of the blades 41 and 4.
2 is displaced from the protruding position to the retracted position by the engagement with the projection 37 of the pin holding jig 34, and is advanced from the inside of the casing into the pin holding jig 34 along the drilling direction A. After the advance, each of the blades 41 and 42 is
Is returned to the protruding position by the urging force. The recovery jig 40 is retracted along the direction opposite to the drilling direction A, and engages each of the blades 41 and 42 held at the protruding position with the engaging groove of the pin holding jig 34, so that the pin holding jig is held. The tool 34 is linked in the same direction.

The operation of the present embodiment will be described with reference to FIGS. Referring to FIG. 8, at the time of drilling, the locking pin 3
3 are respectively fitted into the locking holes 21 of the drive shoe 20 through the through holes 32 of the Kronen bit 30, and the pin urging springs 3 are
It is held in the fitted state against the urging force of No. 5. As a result, the kronen bit 30 is connected to the drive shoe 20 so as to be relatively non-rotatable along the circumferential direction and to be relatively immovable along the drilling direction A. That is, the connection between the kronen bit 30 and the drive shoe 20 is held by the locking pin 33 and the pin holding jig 34. Therefore,
The drop of the kronen bit 30 due to the flushing operation and the like are reliably prevented.

When the drilling is completed, as shown in FIGS. 9 and 10, the recovery jig 40 is advanced from the inside of the casing pipe 10 to the inside of the pin holding jig 34 along the drilling direction A. As shown in FIG. 11, it is retracted along the direction opposite to the drilling direction A. When retracted, the recovery jig 40
The blades 41 and 4 are attached to the projections 37 of the pin holding jig 34.
By engaging 2, the pin holding jig 34 is interlocked in the same direction, and is detached from the inside of the base end portion 31 of the kronen bit 30. With the release of the pin holding jig 34,
The locking pins 33 are respectively dropped from the locking holes 21 and the through holes 32 into the base end 31 of the Kronen bit 30 by the biasing force of the pin biasing spring 35. Lock pin 3
12, as shown in FIG. 12, the kronen bit 30 becomes the casing pipe 10 and the drive shoe 2.
With the recovery of 0, it is easily detached from the drive shoe 20.

As described above, according to the above-described embodiment, the connection between the Kronen bit 30 and the drive shoe 20 is held by the locking pin 33 and the pin pressing jig 34 at the time of punching, and at the completion of punching. , Recovery jig 40
And the locking pin 33 is dropped by the urging force of the pin urging spring 35 to be released. Therefore, the flushing operation of the Kronen bit 30 during drilling can be reliably performed without causing the Kronen bit 30 to fall off, while having a relatively simple structure and reducing costs. When the drilling is completed, the kronen bit 30 can be easily detached from the drive shoe 20.

That is, at the time of drilling, it is possible to reliably prevent the Kronen bit 30 from dropping off from the drive shoe 20 due to the impact vibration of the hydraulic drifter on the drilling machine side, and the flushing operation of the Kronen bit 30 can be performed at a high speed. It can be performed reliably and reliably. Thereby, extremely high drilling efficiency can be ensured. When the drilling is completed, the pin holding jig 34 is detached from the inside of the base end portion 31 of the Kronen bit 30 by the collection jig 40, so that the Kronen bit 30 can be easily detached from the drive shoe 20. As a result, the perforated kronen bit 30 can be left at the deepest portion of the hole, so that the spouting of groundwater after perforation can be prevented.

In the above embodiment, the locking hole 21 of the drive shoe 20 may be formed in a groove shape that does not penetrate in the diameter direction.

[0032]

As described above, according to the present invention, the connection between the Kronen bit and the drive shoe is maintained by the engagement of the locking pin with the locking portion at the time of drilling.
When the piercing is completed, the locking pin is released by detachment from the locking portion. Therefore, the flushing operation of the Kronen bit during the drilling can be reliably performed without inviting the Kronen bit to fall off, and when the drilling is completed, the Kronen bit can be easily detached from the drive shoe. . This makes it possible to ensure extremely high drilling efficiency during drilling, leave the Kronen bit after drilling in the hole, and prevent jetting of groundwater after drilling.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating a punching device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the punching device of FIG.

FIG. 3 is a side view showing a pin holding jig of the punching device of FIG. 1;

FIG. 4 is a sectional view of the pin holding jig of FIG.

FIG. 5 is a side view showing a recovery jig of the punching device of FIG. 1;

6 is a cross-sectional view of the recovery jig of FIG. 5 as seen in the direction of arrow D.

FIG. 7 is a side view showing the blade of the recovery jig of FIG. 5;

8 is a schematic cross-sectional view showing a state at the time of punching of the punching device of FIG.

9 is a schematic sectional view showing a state in which the punching of the punching device of FIG. 1 has been completed and the collection jig has begun to advance.

10 is a schematic cross-sectional view showing a state in which the recovery jig of the punching device of FIG. 1 has advanced.

FIG. 11 is a schematic cross-sectional view showing a state in which the collecting jig of the punching device of FIG. 1 is retracted and the pin holding jig is collected.

FIG. 12 is a schematic cross-sectional view showing a state where the casing pipe of the drilling device of FIG. 1 is retracted and the kronen bit falls off.

FIG. 13 is an exploded perspective view showing a conventional punching device.

FIG. 14 is a cross-sectional view showing another example of a conventional punching device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Casing (casing pipe) 20 Drive shoe 21 Locking part (locking hole) 30 Kronen bit 31 Base end 32 Through hole 33 Locking pin 34 Pin pressing member (pin pressing jig) 35 Biasing member (with pin) 37) Protrusion 40 Recovery member (recovery jig) 41, 42 Blade A Drilling direction

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Okada 168-17 Chikusacho, Hanamigawa-ku, Chiba-shi, Chiba Stock company Daiauchi

Claims (1)

[Claims] 1. A hollow cylindrical casing (10), a hollow cylindrical drive shoe (20) connected to a front end of the casing (10) in a drilling direction (A), and a hollow cylindrical base end ( 31) Drive shoe (20)
In the drilling device provided with a Kronen bit (30) loosely fitted to the front end in the drilling direction (A), a locking portion (2) provided on the drive shoe (20) is provided.
1); a through hole (32) provided at a position corresponding to the locking portion (21) at a base end (31) of the kronen bit (30); and a base of the kronen bit (30). The end portion (31) is detachably fitted to the locking portion (21) through the through hole (32) from the inside, and the kronen bit (30) is moved relative to the drive shoe (20) along the circumferential direction. A locking pin (33), which is non-rotatable and relatively immovable along the drilling direction (A), and is detachably fitted inside the base end (31) of the kronen bit (30); A hollow cylindrical pin holding member (34) for holding the locking pin (33) in a state fitted to the locking portion (21); a locking pin (33) and a kronen bit (30). ) And the locking pin (33) and the locking portion (21). ), And the pin pressing member (34) is moved along with the piercing direction (A) and the reciprocation along the direction opposite to the piercing direction (A). The locking pin (33) is released from the inside of the base end (31) of the bit (30) and collected, so that the locking pin (33) is biased by the urging member (3).
A punching device comprising: a collecting member (40) which is detached from the locking portion (21) by the biasing force of (5).