JP2592407B2 - Perforator - Google Patents

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 a tip end for punching underground.

[0002]

2. Description of the Related Art FIG.
As shown in (1), the kronen bit 1 generally fitted to the tip of the drive shoe 2 is rotated to make a hole.
The Kronen bit 1 is fitted to the drive shoe 2 with limited movement in the circumferential direction and the direction opposite to the drilling direction, and the Kronen bit 1 is rotated by rotating the casing 3 connected to the drive shoe 2. In addition, in order to prevent the spouting of groundwater or the like after completion of drilling, it is necessary to leave the kronen bit 1 at the deepest part of the hole. Therefore, when the drive shoe 2 is retracted in the direction opposite to the drilling direction, the kronen bit 1 comes off from the drive shoe 2. When a normal drilling operation is performed with this drilling device, it is sufficient to simply rotate the kronen bit 1 while pushing it toward the ground. However, when the kronen bit 1 collides with a boulder or a hard layer during drilling, it is preferable to pull the kronen bit in the direction opposite to the drilling direction and re-punch it in the drilling direction (flushing). However, when the drive shoe 2 is pulled, the kronen bit 1 comes off, so that the flushing operation is impossible, and a considerable time is required for drilling.

Therefore, as a perforating device for solving this problem, a device disclosed in Japanese Patent Application Laid-Open No. Hei 4-261996 has been proposed. As shown in FIG. 9, the perforating apparatus includes a connecting means 5 at the rear end of the kronen bit 4, and the connecting means 5 includes projecting members 6 and 6. The projecting members 6 and 6 are supported so as to be able to fit into the locking grooves 8 and 8 of the drive shoe 7. Then, the drive shoes 7 are connected to the kronen bit 4 by fitting the projecting members 6, 6 into the locking grooves 8, 8. As described above, the kronen bit 4 is connected to the drive shoe 7 by fitting the overhanging members 6, 6 into the locking grooves 8, 8, so that the drive shoe 7 is moved in the direction opposite to the drilling direction. However, the kronenbit 4 does not fall off the drive shoe 7. Therefore, a drilling operation including a flushing operation can be performed at the time of drilling, and the drilling operation can be performed efficiently. Also, the overhang members 6, 6
Are provided with leaf springs 9, 9, respectively, and the leaf springs 9, 9 hold the projecting members 6, 6 in a state of being fitted into the locking grooves 8, 8, respectively, by urging force. Therefore, the protruding members 6, 6 are pushed out of the locking grooves 8, 8 by pushing the protruding members 6, 6 in the punching direction against the urging force of the leaf springs 9, 9 using a bar member or the like. (See phantom lines in FIG. 9). Thereby, the kronen bit 4 can be easily separated from the drive shoe 7.

[0004]

However, since the connecting means 5 provided in the punching device disclosed in Japanese Patent Application Laid-Open No. 4-261996 uses a link mechanism, the structure becomes complicated and the cost increases. There is. An object of the present invention is to solve such a problem, and an object of the present invention is to provide a punching device in which a connecting means for connecting a kronen bit and a drive shoe has a simple configuration.

[0005]

The object of the present invention is to provide a hollow cylindrical casing (16) and a hollow cylindrical drive shoe (1) connected to the casing (16).
An inner wall of the drive shoe (11) in a perforation device (10) including 1) and a kronen bit (12) that is loosely fitted to the drive shoe (11) and restricted from moving in the rear end direction. A pair of locking grooves (17, 18) are formed opposite to each other, and a pair of through holes (2) are formed in the peripheral wall of the Kronen bit (12) overlapping the drive shoe (11).
, 22) are formed coaxially with the pair of locking grooves (17, 18), and the one locking groove (17) and the through hole (2) are formed.
1) and a pair of locking pins (25, 26) that can be fitted into the other locking groove (18) and the through hole (22) are projected to one end and the other end of the bendable cylindrical body (24), respectively. The elastic member (2) which is fitted so as to be freely immersed and accommodated in the cylindrical body (24).
The pair of locking pins (25, 26) are made to protrude from both ends of the cylindrical body (24) by the urging force of 7), and the pair of protruding locking pins (25, 26) are respectively engaged with the one engagement member. A stop groove (17) and a through hole (21) and the other stop groove (1)
8) and the through-hole (22) to connect the drive shoe (11) and the kronen bit (12).

[0006]

According to the present invention, a pair of locking grooves are formed on the inner wall of the drive shoe so as to face each other, and a pair of through holes are formed coaxially with the pair of locking grooves in the peripheral wall of the kronen bit overlapping the drive shoe. Formed. In addition, a pair of locking pins that can be fitted into one of the locking grooves and through holes and the other locking groove and through holes are fitted into one end and the other end of the bendable cylinder so as to be freely protruded and retracted. Then, a pair of locking pins are projected from both ends of the cylindrical body by the urging force of the elastic member housed in the cylindrical body,
The protruding pair of locking pins were fitted into one locking groove and through hole and the other locking groove and through hole, respectively. Thereby, the drive shoe and the kronen bit can be connected. On the other hand, by bending the tubular body, the pair of locking pins can be pulled out from the one locking groove and the other locking groove, respectively, so that the kronen bit can be easily detached from the drive shoe.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a punching device according to the present invention. As shown in FIG. 1, the punching device 10 includes a drive shoe 11, a kronen bit 12, a connection unit 13, and a connection release member 14. The drive shoe 11 is screwed to the front end of the casing pipe 16 at the rear end 15, whereby the drive shoe 11 and the casing pipe 16 are coaxially connected.

As shown in FIGS. 1 and 2, locking grooves 17 and 18 are formed on the inner wall of the drive shoe 11 so as to face each other. Kronen bit 1 in drive shoe 11
The second joint 19 is detachably fitted therein, and the joint 19 is formed in a tubular shape. The inner circumference of the drive shoe 11 and the outer circumference of the joint 19 are maintained in a sealed state by O-rings 20, 20. A pair of through holes 21,
22 are formed. One through hole 21 is formed coaxially with the locking groove 17 of the drive shoe 11, and the other through hole 22 is formed coaxially with the locking groove 18 of the drive shoe 11. The kronen bit 12 is connected to the joint 19
A blade portion 23 is formed in front of the blade.

The connecting means 13 comprises a pipe (tubular body) 24, locking pins 25 and 26, a compression spring 27 and the like. As the pipe 24, a thin steel pipe, a thin synthetic resin pipe, a paper pipe, or the like is used. The pipe 24 is normally maintained in a straight line, and easily bends (bent) when a substantially central portion thereof is pressed by a connection releasing member 14 described later.
Strength is set as follows. A locking pin 25 is fitted to one end of the pipe 24 so as to be able to protrude and retract, and a locking pin 26 is fitted to the other end of the pipe 24 so as to be able to protrude and retract.

A compression spring (elastic member) 2 is provided in the pipe 24.
7, one end of the compression spring 27 is in contact with the locking pin 25. The other end of the compression spring 27 is
Is in contact with Thus, the compression spring 27 urges the locking pins 25 and 26 in directions protruding from both ends of the pipe 24, respectively. One locking pin 25 has a compression spring 29a.
Is inserted, and one end of the compression spring 29 a is in contact with the overhang portion 28. The overhang portion 28 is formed at one end of the locking pin 25. The other end of the compression spring 29a is in contact with the inner periphery of the drive shoe 11. The other locking pin 26
A compression spring 29b is fitted into the, and one end of the compression spring 29b is in contact with the extension 30. The overhang portion 30 is formed at one end of the locking pin 26. And the compression spring 29
The other end of b is in contact with the inner periphery of the drive shoe 11.

On the other hand, since the urging force of the compression spring 27 is set to be larger than the urging force of the compression springs 29a and 29b, the compression pins 27 urge the locking pins 25 and 26 in a direction protruding from both ends of the pipe 24. As a result, the locking pin 25 is fitted into the locking groove 17 through the through hole 21 of the joint 19, and the locking pin 26 is fitted into the locking groove 1 through the through hole 22 of the joint 19.
8. Therefore, Kronenbit 12
Are connected to the drive shoe 11.

FIGS. 3 and 4 show the connection releasing member 1 described above.
4 is shown. The connection releasing member 14 includes four blades 32.
And the blade 32 is formed in a cross shape. Feather 32
A rod 35 is fixed via a wedge 34 in a rear cylindrical portion 33 of the wing 32, and the rod 35 is fixed coaxially with a pressing rod 36 in front of the blade 32. This rod 35 is formed of a PC strand. When this connecting member 14 is fitted into the casing pipe 16, the blades 32
The pressing rod 36 is positioned on the axis of the casing pipe in contact with the inner circumference of the inner wall 6 (see FIG. 1). When the rod 35 is formed of a resin, an adhesive is applied instead of the wedge 34 to the cylindrical portion 33.
It is also possible to fix the rod 35 and the cylindrical portion 33 by filling the inside. Further, it is also possible to attach this connecting member to the tip of the anchor tension member inserted into the casing pipe 16.

Next, a method of connecting the drilling device of the present invention thus configured will be described with reference to FIG. First, the drive shoe 11 is fitted into the joint 19 of the Kronen bit 12, and the locking grooves 17, 18 of the drive shoe 11 and the through holes 21, 22 of the joint 19 are positioned coaxially. At the same time, the locking groove 18 of the drive shoe 11 and the through hole 22 of the joint 19 are positioned coaxially. Next, the compression spring 27 is housed in the pipe 24 of the connecting means 13, and the locking pins 25 and 26 are fitted into both ends of the pipe 24. Next, the compression springs 29a, 29b are fitted into the locking pins 25, 26, respectively, and the locking pins 25, 26 are pushed into the pipe 24 in this state.

Subsequently, the connecting means 13 is moved into the joint 19 of the Kronen bit 12, and the locking pins 25 and 26 are positioned coaxially with the through holes 21 and 22. Thereby, the locking pin 25 projects from the upper end of the pipe 24 by the urging force of the compression spring 27 and fits into the locking groove 17 through the through hole 21. At the same time, the locking pin 26 projects from the lower end of the pipe 24 by the urging force of the compression spring 27 and fits into the locking groove 18 via the through hole 22. Thereby, the Kronen bit 12
Are connected to the drive shoe 18. Next, the rear end of the drive shoe 11 and the front end of the casing pipe 16 are screwed together to connect the drive shoe 11 and the casing pipe 1.
And 6. Thereby, the connection of the punching device 10 is completed.

In this state, even if the drive shoe 11 is moved in the direction opposite to the punching direction, the flushing operation can be easily performed because the kronen bit 12 does not come off the drive shoe 11. In addition, Kronen bit 12
By providing the O-rings 20 on the outer peripheral surface of the joint 19, stable adhesion between the Kronen bit 12 and the drive shoe 11 during flushing can be obtained. As shown in FIG. 1, the drive shoe 11 is screwed to a casing 16 and
Are connected to the drive shoe 11 via locking pins 25 and 26 so as not to rotate. Therefore, by moving in the drilling direction while rotating the casing 16, it is possible to excavate while rotating the Kronen bit 12, so that a desired hole can be excavated in the ground. In addition, the Kronen bit 12 is the drive shoe 1
In the case where another configuration is adopted so as not to rotate with respect to 1, the locking grooves 17, 18 may extend annularly in the circumferential direction.

Next, a case where the kronen bit 12 is detached from the drive shoe 11 will be described. After the perforation is completed, the connection release member 14 is moved to the left as shown in FIG. As a result, the tip of the pressing rod 36 of the connection releasing member 14 comes into contact with the approximate center of the pipe 24, and the pipe 24 is bent into a substantially rectangular shape (see FIG. 6). When the connection releasing member 14 is further moved leftward from this state, the pipe 24 is released from the locking pins 25 and 26 together with the compression spring 27. Therefore, the locking pins 25 and 26 are
It comes out of the locking grooves 17, 18 by the urging force of a, 29b.
Thereby, the Kronen bit 12 and the drive shoe 1
The connection with 1 is instantaneously released. When the drive shoe 11 is moved in the direction opposite to the drilling direction in this state, the kronen bit 12 is detached from the drive shoe 11 and remains in the ground.

[0017]

As described above, according to the drilling device of the present invention, an elastic member is housed in a bendable cylinder, and a pair of locking pins are pushed from both ends of the cylinder by the urging force of the elastic member. Protruded. A pair of locking pins protruding from both ends of the cylindrical body fit into locking grooves formed in the drive shoe via through holes formed in the Kronen bit. Therefore, the kronen bit is connected to the drive shoe.
On the other hand, when the cylinder is bent, the elastic member together with the cylinder comes off the pair of locking pins. Therefore, the pair of locking pins comes out of the locking grooves, and the connection between the Kronen bit and the drive shoe is released. As described above, since the krone bit and the drive shoe are connected by a pair of locking pins protruding from both ends of the bendable cylinder, the connection can be released simply by bending the cylinder. The connecting means can be simplified. Therefore, the perforation device can be easily manufactured, and the cost can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a side view showing a connection releasing member used to release the connection between the kronen bit and the drive shoe of the present invention.

FIG. 4 is a front view of the connection release member shown in FIG. 3;

FIG. 5 is an explanatory view illustrating a state in which the perforation devices of the present invention are connected.

FIG. 6 is an explanatory view of a state in which the kronen bit of the punching device of the present invention is detached from the drive shoe.

FIG. 7 is an explanatory view of a state in which the kronen bit of the punching device of the present invention is detached from the drive shoe.

FIG. 8 is an exploded perspective view of a conventional punching device.

FIG. 9 is a sectional view of a conventional punching device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Punching device 11 Drive shoe 12 Kronen bit 16 Casing 17,18 Locking groove 21,22 Through hole 24 Pipe (tubular body) 25,26 Locking pin 27 Compression spring (elastic member)

Claims (1)

(57) [Claims] 1. A hollow cylindrical casing (16), a hollow cylindrical drive shoe (11) connected to the casing (16), and a loose fit with the drive shoe (11) toward the rear end. Bit (1)
2), a pair of locking grooves (1) are formed in the inner wall of the drive shoe (11).
7, 18) are formed facing each other, and the drive shoe (1) is formed.
A pair of through holes (21, 22) are formed in the peripheral wall of the Kronen bit (12) overlapping with the pair of locking grooves (1).
7, 18) and are formed coaxially with the one locking groove (1).
7) and a pair of locking pins (25, 2) that can be fitted into the through hole (21) and the other locking groove (18) and through hole (22).
6) are inserted into one end and the other end of a bendable cylinder (24), respectively, so as to be able to protrude and retract, and the pair of engagement members are biased by an elastic member (27) housed in the cylinder (24). Locking pins (25, 26) are protruded from both ends of the cylindrical body (24), and the pair of protruding locking pins (25, 26) are respectively connected to the one locking groove (17) and the through hole (21). ) And the other engaging groove (18) and the through hole (22) to connect the drive shoe (11) and the kronen bit (12).
0).