JP3384777B2 - Drilling equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for an underground construction method such as a long steel pipe tip receiving construction method for tunnel excavation, an anchor construction method, and the like. The present invention relates to a hole drilling device that generates air bubbles and discharges drilling slime by bubbles, and particularly improves the discharge of bubbles and drilling slime ejected from a hole drilling bit.

[0002]

2. Description of the Related Art Stability of rocks is required for tunnel excavation work on grounds with many cracks and slip surfaces, earth and sand rocks, soft rocks with low strength, expansive rocks and the like. A long steel pipe tip receiving method is known as a type of method for achieving stability of the ground having such properties. During excavation, a cooling medium is sent to the drill bit through the pipe, and excavation slime from the excavation is discharged from the rear end of the pipe through the pipe. We devised to use a foaming body and compressed air to improve the drainage effect of drilling water. However, since the bubbles ejected from the boring bit and the drilling slime have a large volume, if a discharge pipe etc. is provided in the pipe, the amount that can be discharged will be insufficient, so the space inside the pipe will be used as the discharge path, It was discharged with the rear end open. When the rear end was opened, air bubbles and drilling slime were scattered from the rear end of the outer pipe, and the surroundings of the drilling device were soiled, and the volume was increased by the air bubbles, which made recovery difficult.

[0003]

The problem to be solved by the present invention is to solve these problems of the prior art, to recover excavation slime and bubbles without scattering, and to improve the working environment. To provide a hole device.

[0004]

Means for Solving the Problems The structure of the present invention which has solved the above problems is as follows: 1) A drill bit at the tip of an inner pipe having a double pipe structure composed of a plurality of long outer pipes and inner pipes connected to each other. Is provided, and a supply passage for sending the foaming liquid and the compressed air through the inner pipe to the drilling bit in a mixed state and ejecting it at the drilling bit position is provided, and the drilling slime and drilling bit associated with drilling A hole punching device that discharges air bubbles ejected from the rearward through a space between the inner pipe and the outer pipe, wherein a rear end closing portion for closing a rear end opening of the outer pipe It is detachably attached to the end, and a discharge pipe for discharging the drilling slime and bubbles to the outside of the outer pipe is attached to the closed part at the rear end, and a stirrer is provided in the discharge pipe to stir.
Drilling device with an antifoaming agent injection port at the discharge pipe where the body is located 2) Double pipe consisting of multiple long outer pipes and inner pipes connected together
A drill bit is provided at the tip of the inner pipe of the structure
Through to the drilling bit in a mixed state of foaming liquid and compressed air
A supply passage that sends and ejects at the position of the drill bit is provided.
Drilling slime associated with holes and bubbles ejected from drilling bits
Through the space between the inner tube and the outer tube to the rear
This is a hole drilling device that makes the opening at the rear end of the outer tube closed.
Attach the rear end block to the rear end of the outer tube so that it can be detached.
Exhaust drilling slime and bubbles to the outside of the outer tube
Attached to the front and rear ends of the outer pipe, and screw parts for connection.
The outer pipe that protects the threaded portion at the rear end of the connected outer pipe.
The protective part is screwed to the rear end of the outer pipe, and the outer pipe protective part is closed at the rear end.
Drilling apparatus to rotatably mount structure Part 3) double tube consisting of a plurality linked long outer and inner tubes
A drill bit is provided at the tip of the inner pipe of the structure
Through to the drilling bit in a mixed state of foaming liquid and compressed air
A supply passage that sends and ejects at the position of the drill bit is provided.
Drilling slime associated with holes and bubbles ejected from drilling bits
Through the space between the inner tube and the outer tube to the rear
This is a hole drilling device that makes the opening at the rear end of the outer tube closed.
Attach the rear end block to the rear end of the outer tube so that it can be detached.
Exhaust drilling slime and bubbles to the outside of the outer tube
A discharge pipe is attached to the
The defoamer injection port is provided at the discharge pipe part where the body is located , the connecting screw parts are provided at the front and rear ends of the outer pipe, and the outer pipe protecting part that protects the screw part at the rear end of the connected outer pipe is the outer pipe. The outer tube protection part is screwed to the rear end and rotatably attached to the rear end blocking part.
The drilling apparatus

[0005]

In the present invention, the drilling slime accompanying the drilling and the bubbles ejected from the drilling bit are sent to the rear end of the outer pipe through the space between the outer pipe and the inner pipe. Since a rear end blocking part is provided at the rear end of the outer tube,
The drilling slime and air bubbles are stopped at the rear end, and then discharged to the outside through the discharge pipe provided at the rear end closed portion. Therefore, the drilling slime and bubbles are discharged from one place without scattering from the rear end. In the case where a stirrer is provided in the drainage pipe and a defoaming agent injection port is provided at the place where the stirrer is located, the defoaming agent is injected into the drilling slime and bubbles in the drainage pipe, and the stirring body stirs to defoam. Reduce the drilling slime capacity. A screw structure for connecting the front and rear ends of the outer tube, the outer tube protection part is screwed to the rear end of the outer tube, and the rear end blocking part is attached to the outer tube protection part has a tube structure that can be easily connected. Also, protect the threaded portion at the rear end of the pipe so that it will not interfere with subsequent connections.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION As a method for sending a foaming liquid and compressed air to a drill bit of a drilling device of the present invention in a mixed state, thrust and rotational force are applied to the drill bit at the rear end of the drill bit. There is a type that installs an inner tube rod for transmitting the striking force inside the outer tube and has a supply passage inside the inner tube rod, and a case where a supply tube that only supplies is provided inside the outer tube. I don't care.

[0007]

Embodiments of the present invention will be specifically described with reference to the drawings. 1 to 5 show a structure in which a swivel part is provided in an adapter, the adapter is provided with a drifter mounting hole, an inner pipe rod mounting hole, and a communication part, and the swivel part covers the communication part, This is an example of a drilling device in which a discharger head is screwed to an end as an outer pipe protection part, a rear end blocking part is attached to the discharger head, and a discharge pipe is provided in the rear end blocking part. FIG. 1 is an explanatory view in which a part of the hole drilling device of the embodiment is enlarged. FIG. 2 is an explanatory view of the drilling device of the embodiment. FIG. 3 is an enlarged view of a part of the hole drilling device of the embodiment. FIG. 4 is an explanatory diagram of a hole drilling bit mounting portion of the hole drilling apparatus of the embodiment. FIG. 5 is a front view of a hole drilling bit portion of the hole drilling apparatus of the embodiment. In the figure, 1 is a drilling machine equipped with a drilling device, 2 is an outer pipe, 2a is a screw part, 3
Is an inner pipe rod, 3a is a supply passage, 3b is a screw part, 4 is an excavation bit, 4a is a supply passage, 4b is a discharge passage, 4c is an excavation blade, 4d is a large diameter portion, 4e is an outer peripheral side bit, and 5 is an adapter. 5a is a drifter mounting hole, 5b is an inner pipe rod mounting hole, 5c is a communicating part, 6 is a swivel part, 6a is a sealing part,
6b is a passage, 6c is a fixture, 6d is a mounting bolt, 7 is a drifter, 7a is an output shaft, 10 is a discharger head used as an outer pipe protecting part, 11 is a rear end blocking part, and 12 is a discharge pipe. Drainage pipe, 12a intake, 12b agitator, 13 connector, 14 casing shoe, 14
a is a stepped portion, 15 is a discharge tube, 15a is a defoaming body injection port, and 16 is a stirring body. In the hole drilling apparatus of the embodiment, the inner pipe rod 3 has a supply passage 3a inside and screw portions 3b at both ends. At the rear end of this inner tube rod 3, a connecting tool 1
3 is screwed on, and the drill bit 4 is attached to the tip. The drill bit 4 is provided with a drill blade 4c at its tip as shown in FIG. 4, and is connected to the supply passage 3a of the inner pipe rod 3 inside the drill bit 4c.
A supply path 4a that communicates with the outside is provided in the vicinity. Also,
The excavating bit 4 has a shape in which three circumferential positions are notched from the outer circumference toward the inner side, and the notched portions continue from the tip to the rear to form the discharge path 4b. Further, a large-diameter portion 4d having a large diameter is provided behind the excavating blade 4c. Further, as shown in FIG. 4, an outer peripheral side bit 4e rotatable with respect to the excavating blade 4c is provided on the outer periphery of the tip of the excavating bit 4, and the outer peripheral side bit 4e has a cylindrical casing shoe 14a.
Is attached by screwing so that the drill bit 4 is accommodated inside the casing shoe 14. Further, on a part of the inner circumference of the casing shoe 14, a large diameter portion 4d of the drill bit 4 is formed.
A step portion 14a that engages with is provided. Next, another inner pipe rod 3 is attached to the rear end of the connector 13 attached to the rear end of the inner pipe rod 3.
The outer tube 2 which is tubular and has a threaded portion 2a at both ends is connectable to the rear end of the casing shoe 14 and is connectable. Further, another outer tube 2 is screwed to the rear end of the outer tube 2. Thereby, the inner pipe rod 3 is housed inside the outer pipe 2. The lengths of the inner pipe rod 3 and the outer pipe 2 are always such that the rear end portion of the inner pipe rod 3 connected from the rear end of the outer pipe 2 connected as shown in FIG. The inner pipe rod 3 and the outer pipe 2 are successively added in accordance with the excavation. The discharger head 10 for protecting the screw portion 2a of the outer tube 2 is screwed to the rear end of the connected outer tube 2. At this time, the rear end closing portion 11 is attached to the rear end of the discharger head 10.
The rear end closing portion 11 has a cup shape in which one end of a tubular shape is closed, and an outer peripheral portion of the end on the open side is formed into an annular convex shape so as to increase the diameter. Further, a hole is provided in the center of the closed portion so that the inner tube rod 3 can project. Since the rear end of the discharger head 10 is provided with an annular protrusion that is convex on the inner diameter side, the discharger head 10
The rear end and the front end of the rear end closing portion 11 are engaged with each other so that the discharger head 10 is attached to the rear end of the outer tube 2 together with the rear end closing portion 11. In this way, the rear end blocking portion 11
Thus, the rear end of the outer tube 2 is closed. Further, a drain pipe 12 is attached to the outer peripheral portion of the rear end blocking portion 11.
The outer circumference of the tip of the drainage pipe 12 is provided with a step to prevent the attached tube from coming off, and the drainage pipe 12 is further provided with a fixture for fixing the attached tube from the outer peripheral side. The drain pipe 12 is provided with a discharge tube 15, and the discharge tube 15 is provided with a defoaming body injection port 15a. Furthermore, inside the discharge tube 15, a stirring body 1 for rotating the screw to stir the inside of the discharge tube 15 is provided.
6 is provided. Next, the adapter 5 is attached to the rear end of the inner pipe rod 3 protruding from the rear end blocking portion 11 of the rear end of the outer pipe 2. The adapter 5 has a cylindrical shape, and has an inner pipe rod mounting hole 5b of a predetermined depth that can be screwed to the rear end of the inner pipe rod 3 on one end surface. Next, a drifter mounting hole 5a having a predetermined depth to which the output shaft of the drifter can be mounted is provided on the opposite end surface. Drifter mounting hole 5a and inner pipe rod mounting hole 5b
Do not communicate. The bottom surface of the drifter mounting hole 5a has a planar shape so that the thrust and striking force from the drifter output shaft can be received by the surface. Next, a communication portion 5c that communicates from the outer periphery of the adapter 5 to the inner pipe rod mounting hole 5b is provided. Next, the cylindrical swivel portion 6 is provided so as to annularly cover the outer peripheral portion of the adapter 5 where the communication portion 5c is provided. An attachment tool 6 provided with an annular groove on a part of the outer circumference of the adapter 5 and engaged with an annular groove on the outer circumference of the adapter at the end of the swivel portion 6.
Attach c with the mounting bolt 6d. As a result, the swivel portion 6 becomes rotatable with respect to the adapter 5. Also,
An annular groove is provided on the inner periphery of the swivel portion 6 at a position facing the outer peripheral open portion of the communication portion 5c, and an intake port is provided on a part of the outer periphery of the swivel portion 6 to communicate with the annular groove to form a passage 6b. To do. Next, two seal portions 6a are provided in front of and behind the annular groove of the swivel portion 6 to seal an annular space between the inner circumference of the swivel portion 6 and the outer circumference of the adapter 5. Next adapter 5
The output shaft 7a of the drifter 7 is attached to the drifter attachment hole 5a. This drilling device is attached to an up-and-down movable arm provided at the tip of a drilling machine 1 that drives and moves wheels. Further, a compressor for sending air to the passage 6b of the swivel unit 6 and a foaming solution used as drilling water are provided near the boring machine 1 when the work is performed.
Position another mobile vehicle equipped with a foaming solution supply device for delivery to. In order to drive and excavate the hole drilling device of this embodiment, the drifter 7 is driven to drive the drifter 7.
The thrust force, the impact force, and the rotational force from the output shaft are transmitted to the adapter 5, transmitted to the excavation bit 4 through the inner pipe rod, and the excavation bit 4 excavates the natural ground to form a hole. When the drill bit 4 is drilled in this manner, the large diameter portion 4d of the drill bit 4 pushes the step 14a of the casing shoe 14 so that the outer tube 2 is pulled from the tip. Promote. Along with this, the outer pipe 2 and the inner pipe rod 3 are sequentially added to form a long drilling hole and a pipe. Unlike the conventional case, the bottom surface of the drifter mounting hole 5a of the adapter 5 can receive the thrust force and the striking force of the output shaft of the drifter 7 on all the surfaces, so that the force can be reliably transmitted and the force applied per unit area. Is smaller, and reliability and durability are improved. When drilling is performed in this manner, the foaming solution supply device and the compressor send the foaming solution and air to the intake port of the swivel unit 6. The foaming solution and air are supplied to the supply passage 3a of the inner pipe rod 3 from the inner pipe rod mounting hole 5b through the passage 6b of the swivel portion 6, and are cooled from the supply passage 3a through the supply passage 4a of the drill bit 4. It is supplied as a working medium near the excavating blade 4c. The excavation slime excavated by the excavation bit 4 moves rearward through the discharge passage 4b and between the outer circumference of the inner pipe rod 3 and the inner circumference of the outer pipe 2. In the hole drilling device of this embodiment, the rear end blocking portion 11 attached to the rear end of the outer pipe 2 discharges the excavated slime to the outside through the drain pipe 12 without scattering from the rear end of the outer pipe. Furthermore, a defoaming agent is injected from the defoaming body injection port 15a of the discharge tube 15 attached to the discharge pipe 12, and the stirring body 16 stirs to defoam the drilling slime having an increased volume. Recovery can be performed with a small volume. Therefore, the recovery work becomes very efficient, and the work environment can be kept in a good state.

[0008]

According to the present invention, it is possible to obtain a drilling device capable of collecting excavation slime and bubbles so as not to scatter and improving the working environment. A stirrer is installed in the drainage pipe, and an antifoaming agent injection port is provided at the place where the stirrer is located, so that the capacity of the drilling slime can be reduced to efficiently collect the discharged drilling slime. To The one that connects the front and rear ends of the outer pipe with the connecting screw part, the outer pipe protection part is screwed to the rear end of the outer pipe, and the rear end blocking part is attached to the outer pipe protection part makes the work of connecting the outer pipe efficient. It is possible to achieve both the effective operation, the easy recovery of the drilling slime and the bubbles, and the improvement of the working environment.

[Brief description of drawings]

FIG. 1 is an enlarged view of a part of a hole drilling device according to an embodiment.

FIG. 2 is an explanatory diagram of a drilling device according to an embodiment.

FIG. 3 is an enlarged view of a part of the hole drilling device of the embodiment.

FIG. 4 is an explanatory diagram of a drill bit mounting portion of the drill device of the embodiment.

FIG. 5 is a front view of a drilling bit portion of the drilling device of the embodiment.

[Explanation of symbols]

1 Drilling machine equipped with drilling device 2 outer tube 2a screw part 3 Inner tube rod 3a Supply passage 3b screw part 4 drill bits 4a supply path 4b discharge path 4c drilling blade 4d large part 4e Outer peripheral side bit 5 adapter 5a Drifter mounting hole 5b Inner tube rod mounting hole 5c Communication part 6 swivel part 6a Seal part 6b passage 6c attachment 6d mounting bolt 7 Drifter 7a Output shaft 8 missing number 9 Missing number 10 Discharger Head 11 Rear end block 12 drainage pipe 12a intake 12b Stirrer 13 Connector 14 Casing shoe 14a Step portion 15 Discharge tube 15a Defoamer injection port 16 Stirrer

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Ninomiya 2-15-2 Konan, Minato-ku, Tokyo Obayashi Corp. Tokyo headquarters (72) Inventor Shoji Naka, 2-15-2 Konan, Minato-ku, Tokyo Stock company Obayashi Tokyo Head Office (56) Reference JP-A-4-312693 (JP, A) Actual development Sho 63-176194 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21B 21/14

Claims (3)

(57) [Claims] 1. A boring bit is provided at the tip of an inner pipe having a double pipe structure composed of a plurality of long outer pipes and inner pipes connected to each other, and a foaming liquid and compressed air are passed through the inner pipe. Is provided in the mixed state to the boring bit and a supply passage for ejecting at the position of the boring bit is provided, and the drilling slime accompanying the boring and the bubbles ejected from the boring bit are between the inner pipe and the outer pipe. A hole drilling device for discharging backward through a space, in which a rear end closing part for closing the rear end opening of the outer pipe is detachably attached to the rear end of the outer pipe, and a drilling slime and bubbles are attached to the rear end closing part. Attach a discharge pipe to discharge the water to the outside of the outer pipe, and place a stirring body in the discharge pipe.
A drilling device provided with a defoaming agent injection port at a discharge pipe portion provided with a stirrer . 2. A long outer pipe and an inner pipe which are connected to each other.
A drill bit is provided at the tip of the inner pipe of the double pipe structure
The foaming liquid and the compressed air are mixed through the inside of the pipe,
Feed path to the hole
Providing and squirting from drilling slime and drill bit associated with drilling
Back through the space between the inner and outer tubes.
It is a hole drilling device that discharges toward the outside and closes the opening at the rear end of the outer tube.
Attach the rear end blocking part to the rear end of the outer tube
The drilling slime and bubbles to the outside of the outer tube
Attach a discharge pipe for discharging and connect to the front and rear ends of the outer pipe
A screw section for the rear end of the connected outer tube is provided.
The outer tube protection part to be protected is screwed to the rear end of the outer tube,
A hole drilling device with a structure that is rotatably attached to the rear end blocking part . 3. A plurality of long outer pipes and inner pipes connected to each other.
A drill bit is provided at the tip of the inner pipe of the double pipe structure
The foaming liquid and the compressed air are mixed through the inside of the pipe,
Feed path to the hole
Providing and squirting from drilling slime and drill bit associated with drilling
Back through the space between the inner and outer tubes.
It is a hole drilling device that discharges toward the outside and closes the opening at the rear end of the outer tube.
Attach the rear end blocking part to the rear end of the outer tube
The drilling slime and bubbles to the outside of the outer tube
Attach a discharge pipe for discharging, and place a stirrer inside the discharge pipe.
Provide a defoaming agent injection port at the discharge pipe location with a stirrer,
A screw part for connection is provided at the front and rear ends of the outer pipe, and an outer pipe protection part that protects the screw part at the rear end of the connected outer pipe is screwed to the rear end of the outer pipe, and the outer pipe protection part is A drilling device with a structure that is rotatably attached to the end blocking part.