JPH0860974A - Drilling device for use in long-size receptacle construction method - Google Patents

Abstract

PURPOSE: To prevent a pipe adapter and a joint adapter from disconnecting from each other even when a drilling bit is moved backward. CONSTITUTION: A receptacle pipe 107 and a thread protector 111 are connected together by means of threads 110, 112, and the thread protector 111 and a pipe adapter 113 are connected together by inserting the pipe adapter 113 into the thread protector 111, and locking the projection 132 of the pipe adapter 113 into an L-shaped slit 131 formed in the rear end of the thread protector 111. The pipe adapter 113 and a joint adapter 120 are connected together by inserting the joint adapter 120 into the pipe adapter 113, and locking the projection 135 of the joint adapter 120 into an L-shaped slit 113 formed in the rear end of the pipe adapter 113. A rod 105 and the joint adapter 120 are connected together by means of threads 119, 121.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention inserts a plurality of receiving pipes by obliquely drilling the ground around a tunnel excavation cross section from the periphery of a face and surrounding the insertion of these receiving pipes. In the long length receiving method for suppressing the preceding loosening of the ground by injecting the ground reinforcing material into the ground through the receiving pipe,
The present invention relates to a boring device for boring the ground and inserting a receiving pipe into the ground.

[0002]

2. Description of the Related Art Conventionally, in a long receiving method, a guide supported by a boom 2 of a jumbo drill 1, as shown in FIG. The cell 3 is provided with a drifter 4, a rod 5 connected to the drive shaft of the drifter 4 is attached with a hole drilling bit 6 capable of expanding the diameter, and a steel pipe 7 is mounted on the rod 5 to drive the drifter 4. It is known that the pipe 7 is moved forward and drilled obliquely from the periphery of the face 9 toward the ground 8 around the tunnel cross section, and the pipe 7 is inserted into the drilled hole.

In the above boring device, the boring tool such as the boring bit 6 has the structure shown in FIGS. That is, an outer screw 10 is formed at the rear end of the receiving pipe 7, and a tubular screw protector 11 having an inner screw 12 is connected by screwing the inner screw 12 into the outer screw 10. The tip small diameter portion 14 of the tubular pipe adapter 13 is inserted into the screw protector 11. Further, on the rear end side of the pipe adapter 13, the tip small diameter portion 16 of the cylindrical holder cap 15 is provided.
Is inserted. On the other hand, the outer screw 18 on the rod tip side is screwed into the rear inner screw 17 of the drill bit 6. The rod 5 is inserted into the receiving pipe 7, the screw protector 11, the pipe adapter 12, and the holder cap 14, and the outer screw 19 at the rear end is the inner screw 21 on the front end side of the joint adapter 20.
The joint adapter 20 has a rear end side inner screw 22 and an outer screw 24 provided on the drive shaft 23 of the drifter 4.
Are screwed together.

Therefore, the axial impact and the circumferential rotation applied to the drive shaft 23 of the drifter 4 are transmitted to the drill bit 6 via the joint adapter 20 and the rod 5.
Further, the impact is transmitted to the receiving pipe 7 through the joint adapter 20, the holder cap 15, the pipe adapter 13, and the screw protector 11, and as the drifter 4 advances, the receiving pipe 7 is drilled in the hole drilled by the drilling bit 6. Is inserted. However, the rotation of the drive shaft 23 is not transmitted to the receiving pipe 7.

When connecting the receiving pipe 7, the joint adapter 20 is first removed from the rod 5. Next, the screw protector 11 is removed from the front receiving pipe 7, and this, the pipe adapter 13, and the holder cap 15 are removed from the rod 5. Then, behind the rod 5 and the receiving pipe 7, another receiving pipe in which the rod is already installed is arranged, and the rod and the receiving pipe are inserted into the ground.
And the receiving pipe 7 are manually connected, and the newly connected rod and the receiving joint adapter are connected to the joint adapter 20 and the screw protector 11 respectively at the rear part thereof, and the second receiving pipe is grounded in the same manner as described above. To insert. When the insertion of the pilot pipe 7 is completed, the drifter 4 is retracted and the rod 5 and the drill bit 6 are extracted from the pilot pipe 7. Further, the ground strengthening agent is supplied to the receiving pipe 7, is discharged from a plurality of holes provided in the receiving pipe 7, and is injected into the ground 8.

[0006]

However, in the above-mentioned receiving pipe inserting device, the pipe adapter 13 inserts the tip small diameter portion 14 into the screw protector 11, and similarly, the holder cap 15 inserts the tip small diameter portion 16 into the pipe. It is installed in the adapter 13. Therefore, when the drifter 4 and the drill bit 6 are retracted during drilling, there is a problem that the pipe adapter 13 and the holder cap 15 come off from the screw protector 11 and the pipe adapter 13, respectively. Further, since the drilling work is performed at a high position in the tunnel cross section, there is a problem that it takes a lot of time to repair the hole once it is removed.

[0007]

SUMMARY OF THE INVENTION Therefore, the present invention has been made to solve the above-mentioned problems, and in a drilling apparatus of a long length pre-receiving method, a drifter (104) moving along a guide cell is used. The drive shaft (123) has a joint adapter (120), a rod (105), and a drill bit (1).
06) are sequentially connected to the rod (105), the receiving pipe (107) in which the drill bit (106) is movable from the drill bit (106) side, and the screw protector (111). And a pipe adapter (113), and the receiving pipe (107) and the screw protector (11).
1) is connected with a screw (110, 112), and the screw protector (111) and the pipe adapter (113) are
The pipe adapter (113) is attached to the screw protector (11
1), the screw protector (111) is connected to an L-shaped slit (131) formed from the rear end of the screw protector (111) by engaging a projection (132) provided on the pipe adapter (113). (113) and the joint adapter (120) are the joint adapter (12
0) is inserted into the pipe adapter (113), and the joint adapter (120) is inserted into the L-shaped slit (133) formed from the rear end of the pipe adapter (113).
The projection (135) provided on the above is engaged and connected, and the rod (105) and the joint adapter (120) are connected by screws (119, 121).

A centering holder (136) is preferably attached to the rod (105) in a removable manner.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a portion of a drilling device used in the long pre-reception method according to the present invention. In this drilling device, the rear portion of the screw protector 111 is L
The character-shaped slit 131 is formed. As shown in FIG. 2, the pipe adapter 113 has two projections 132 provided axially symmetrically on the outer periphery of the tip 114 thereof, and the rear part inserted into the screw protector 111 has two L-shaped parts from the end. The slit 133 is formed in axial symmetry. As shown in FIG. 3, the joint adapter 120 has such a size that the tip end side 134 can be inserted into the rear part of the pipe adapter 113, and two projections 135 are provided on the tip end side outer circumference.
Are provided axisymmetrically. Other configurations are the same as those of the conventional drilling device shown in FIG. 7, and the same parts are designated by the same reference numerals and the description thereof will be omitted.

In the hole drilling device, a screw protector 111 is connected to a rear outer screw 110 of the receiving pipe 107 by screwing an inner screw 112 at the tip thereof. Pipe adapter 11
3, the front end 114 of the screw protector 3 is mounted inside the rear portion of the screw protector 111, and the protrusion 132 is engaged with the slit 131 to be connected. The joint adapter 120 is connected by inserting the front end side 134 into the rear part of the pipe adapter 113 and engaging the projection 135 with the slit 133.

The drill bit 106 has a rear internal thread 117.
An outer screw 118 of the tip of the rod 105 is connected to the rod 105 and is inserted into the receiving pipe 107 together with the rod 105. And
The rear outer screw 119 of the rod 105 is screwed and connected to the inner screw 121 of the tip of the joint adapter 120. Further, in the joint adapter 120, the drive shaft 123 of the drifter 104 has its outer screw 124 and rear inner screw 122.
Is screwed and connected.

Therefore, when the drive shaft 123 is rotated in the direction of arrow a (normal rotation) by driving the drifter 104, the rotation is transmitted to the rod 105 and the drill bit 106 via the joint adapter 120, and at the same time, the pipe adapter. 1
13, the receiving pipe 107 via the screw protector 111
The rotation is transmitted to. In addition, the impact of the drive shaft 123 is
It is also transmitted to the drill bit 106 and the receiving pipe 107.
Further, by advancing the drifter 104, while drilling the ground with the drilling bit 106, the receiving pipe 107 is inserted into the hole formed thereafter.

When the drill bit 106 is retracted by hitting a rock or a solid ground during drilling, the drive shaft 123 is rotated or stopped in the direction of arrow a to retract the drifter 104. At this time, the protrusion 132 of the pipe adapter 113
And the projection 135 of the joint adapter 120 engages with the tip ends of the L-shaped slits 131 and 133 provided in the screw protector 111 and the pipe adapter 113, respectively.
Therefore, even if the drifter 104 is retracted, the pipe adapter 113 and the joint adapter 120 do not come off from the screw protector 111 and the pipe adapter 113, respectively.

When the rod and the receiving pipe are replenished, the screw protector 111, the pipe adapter 113, and the joint adapter 120 are separated from each other, and the receiving pipe having the rod inside is arranged behind the receiving pipe 107, and the rods are connected to each other. After connecting with a coupling (not shown) or the like, the screw protector 111, the pipe adapter 113, and the joint adapter 120 are connected to the rear portion of the new receiving pipe. Further, the joint adapter 120 is connected to the rear end of the rod and the drive shaft 123 of the drifter 104, and the drive shaft 123 of the drifter 104 is normally rotated. This causes the new receiving pipe to rotate. Therefore, if an inner screw is provided at the tip of the newly-received receiving pipe, this is automatically connected to the rear outer screw 110 of the receiving pipe 107 already inserted in the ground.

The rod 105 is made of an elastic material such as rubber or urethane as shown in FIG.
By externally mounting the centering holder 136 having the rod 7, the rod 105 mounted in the receiving pipe 107 can be accurately positioned at the center, and the rods can be easily connected. Further, if the outer diameter of the centering holder 136 is set to be the same as or slightly larger than the inner diameter of the receiving pipe 107, the displacement of the rod 105 can be prevented, and when the receiving pipe 107 in which the rod 105 is installed is transported. On the rod 1
05 will not fall. Also, the receiving pipe 1
By providing a taper 138 on the side where the rod 105 is inserted with respect to 07, the centering holder 136 can be easily inserted into the receiving pipe 107. The angle of the taper 138 is 10 to 20 with respect to the center line (axis).
Suitably it is formed with an angle of degrees. The centering holder 136 is taken out from the front receiving pipe 107 together with the rod 105 if the rod 105 is pulled out from the front receiving pipe 107 after the front receiving pipe 107 is inserted.

[0016]

As is apparent from the above description, according to the present invention, the screw protector and the pipe adapter, and the pipe adapter and the joint adapter respectively have the projections formed on the tip side of the pipe adapter and the joint adapter, respectively.
L formed from the screw protector and the rear end of the pipe adapter
Since they are engaged with and connected to the character-shaped slit, when the drifter is retracted, the screw protector, the pipe adapter, and the screw adapter are rotated by rotating the drive shaft so that the protrusion engages with the tip of the slit. The joint adapter works together without coming off. Therefore, the subsequent forward movement can be performed without any trouble.

Further, since the rod is set at the center of the receiving pipe by providing the rod with the detachable centering holder, the connecting work between the rods can be easily performed, and the rod can be installed in the receiving pipe. Can be positioned reliably.

[Brief description of drawings]

FIG. 1 is an exploded view of a drilling device of a long front receiving method according to the present invention.

FIG. 2 is a partially cutaway side view of a pipe adapter used in the drilling device shown in FIG.

3 is a half cutaway side view of the joint adapter shown in FIG. 1. FIG.

FIG. 4 is a vertical cross-sectional view showing a connected state of a receiving pipe, a screw protector, a pipe adapter, and a joint adapter in the hole drilling device shown in FIG.

FIG. 5 is a perspective view of a centering holder.

FIG. 6 is an explanatory view of a long length receiving method.

FIG. 7 is an exploded view of a conventional drilling device.

FIG. 8 is a cross-sectional view in which the components shown in FIG. 7 are connected.

[Explanation of symbols]

104 ... Drifter, 105 ... Rod, 107 ... Receiving pipe, 111 ... Screw protector, 113 ... Pipe adapter, 120 ... Joint adapter, 123 ... Drive shaft, 1
31, 133 ... Slits, 132, 135 ... Protrusions.

Claims (2)

[Claims] 1. The ground surrounding the tunnel excavation cross section is obliquely drilled from the periphery of the face to insert a plurality of receiving pipes, and the receiving pipes are inserted into the surrounding ground where these receiving pipes are inserted. In the drilling device of the long front receiving method that suppresses the preceding loosening of the ground by injecting the ground reinforcement through the joint adapter, the rod, and the drill bit on the drive shaft of the drifter that moves along the guide cell. The rod is provided with a receiving pipe, a screw protector, and a pipe adapter, in which the drilling bit can move inside, from the drilling bit side. The receiving pipe and the screw protector are installed on the rod. The screw protector and the pipe adapter are connected to each other with a screw, and the pipe protector and the pipe adapter are inserted into the screw protector, and at the same time, the screw protector is inserted into an L-shaped slit formed from the rear end of the screw protector. The projections provided on the pipe adapter are engaged and connected to each other, and the pipe adapter and the joint adapter are inserted into the pipe adapter, and the L-shaped slit formed from the rear end of the pipe adapter is joined to the joint adapter. A long hole pre-drilling device, characterized in that the provided projections are engaged and connected, and the rod and the joint adapter are connected by a screw. 2. The drilling device according to claim 1, wherein a centering holder is detachably provided on the rod.