JP3382576B2 - Drilling equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling device for use in tunnel excavation work, and more particularly to an improvement in the feeding of a foaming liquid and compressed air in a mixed state and the discharge of bubbles and drilling slime.

[0002]

2. Description of the Related Art Stability of rocks is required for tunnel excavation work on rocks with many cracks and slip surfaces, mud rocks, soft rocks with low strength, expansive rocks, etc. A long steel pipe tip receiving method is known as a type of method for achieving stability of the ground having such properties. In the long steel pipe tip receiving method, an inner pipe rod with a drill bit attached to the tip, an outer pipe that houses this inner pipe rod, and a drifter that applies thrust, rotational force, and impact force to the drill bit Is used. The output shaft of the drifter is attached to the rear end of the inner tube rod via an adapter. The adapter is provided with a through hole, and the output shaft of the drifter is provided with a feed hole for feeding the cooling medium from the inside of the drifter through the through hole of the adapter to the medium supply passage of the inner tube rod. During excavation, a cooling medium such as drilling water or air is sent from the tip of the output shaft of the drifter through the adapter into the medium supply passage of the inner pipe rod, and further the cooling medium is sent from the medium supply passage to the drilling bit. Excavation slime from the excavation is discharged from the rear end of the outer pipe through a slime discharge passage between the outer circumference of the inner pipe rod and the inner circumference of the outer pipe. It was devised that a foaming liquid and compressed air were used to improve the drainage effect of drilling water. However, when sending the foaming liquid from the drifter to the drilling bit together with the air, the feed hole of the output shaft of the drifter and the through hole of the adapter may not be able to be sent smoothly due to the small diameter. The foaming liquid foams. Further, when the foaming liquid is used as the drilling water, the volume becomes large due to the air at the time of discharge, the particles scatter from the rear end of the outer tube, and the volume becomes large, which makes recovery difficult.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to solve these problems of the prior art and to make it possible to smoothly and sufficiently supply sufficient foaming liquid and air to the drill bit. An object of the present invention is to provide a drilling device that can improve the efficiency of drilling work.

[0004]

Means for Solving the Problems The constitution of the present invention which has solved the above problems is as follows: 1) An outer tube is provided with an inner tube rod having a drilling bit mounted on the tip thereof, and is connected long by screw portions at the front and rear ends. The pipe is provided so that the inner pipe rod is housed therein, and the inside of the inner pipe rod serves as a supply passage for sending the foaming liquid and the compressed air to the drilling bit in a mixed state, and the outer periphery of the inner pipe rod and the outer pipe. A slime discharge passage for discharging the drilling slime accompanying the drilling and the bubbles ejected from the drilling bit to the outside is provided between the inner circumference of the pipe, and thrust and rotational force and impact are applied to the rear end of the inner pipe rod via an adapter. A drilling device to which a drifter for applying a force is connected, wherein a swivel portion having a passage for sending foaming liquid and compressed air from the outer circumference of the adapter to the supply passage of the inner pipe rod is provided on the adapter, and the rear end of the outer pipe is provided. To protect the screw part at the rear end of the outer tube
Screw the discharger head and project the inner tube rod.
Set the rear end closing part that rotatably closes the rear end of the outer tube.
Attach it to the charger head, and install a discharge pipe at the
A stirrer inside the discharge pipe so that there is a stirrer
An anti-foaming agent injection port is provided at a location, and the foaming liquid and compressed air are sent from the adapter to the medium supply passage of the inner pipe rod without passing through the tip of the drifter. 2) Drilling device attached to the adapter Make a hole at the rear end,
Insert the tip of the drifter into the drifter mounting hole to connect it, provide the inner tube rod mounting hole at the front end of the adapter, insert the inner tube rod into the inner tube rod mounting hole to connect, and connect the inlet to the outer circumference of the adapter. The drilling device according to the above 1), which is provided with a swivel portion connected to the inlet.

[0005]

In the present invention, by providing the swivel portion on the adapter, the foaming liquid and the compressed air are sent from the outer periphery of the adapter to the supply passage without passing through the tip of the drifter. Therefore, since the tip of the drifter and the part of the adapter that receives the force from the drifter do not need to have a passage area, it receives a wide surface to reliably transmit the force, and it is not necessary to consider the strength of the drifter and secure a sufficient passage area. can do. If the adapter is provided with a drifter mounting hole, an inner tube rod mounting hole, and an injection port, and the adapter is equipped with a swivel part, the foaming liquid and compressed air can be sent from the swivel part that does not rotate even if the adapter rotates by the drifter. It can be so. In the case where the discharger head is screwed to the rear end of the outer pipe, the rear end closing part is provided on the discharger head, and the discharge pipe is provided at the rear end closing part, the drilling slime does not scatter from the rear end of the outer pipe. Then, it can be discharged from the discharge pipe. The agitator in the discharge pipe is provided, since there is provided a defoaming agent injection port locations with stirrer, capacity of drilling slime by defoaming by mixing with agitator injecting a defoaming agent to the bubble to be discharged To reduce.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Drilling water may be used in place of the foaming liquid and the compressed air.

[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, a rear end closing part is attached to the discharger head, and a discharge pipe is provided at the rear end closing 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 threaded portion, 3 is an inner pipe rod, 3
a 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, 5 is an adapter, 5a is a drifter attachment Holes, 5b are inner tube rod mounting holes, 5c is a communicating part, 6 is a swivel part, 6a is a seal part, 6b is a passage, 6
c is a fixture, 6d is a mounting bolt, 7 is a drifter, 7a
Is an output shaft, 10 is a discharger head, 11 is a rear end closed portion, 12 is a drain pipe used as a discharge pipe, 12a is an inlet, 12b is a stirring body, 13 is a connecting tool, 14 is a casing shoe, and 14a is a step. Part, 15 is a discharge tube, 15
Reference numeral a 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. This inner tube rod 3
A connecting tool 13 is screwed to the rear end of the rear end, and the drill bit 4 is attached to the front end. As shown in FIG. 4, the excavating bit 4 is provided with an excavating blade 4c at its tip, and internally has a supply passage 4a connected to the supply passage 3a of the inner pipe rod 3 and communicating with the outside in the vicinity of the excavating blade 4c. Further, 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 which is rotatable with respect to the excavating blade 4c is provided on the outer periphery of the tip of the excavating bit 4, and a cylindrical casing shoe 14 is screwed to the outer peripheral side bit 4e to attach the casing. The drill bit 4 is accommodated inside the shoe 14. Further, a step portion 14a that engages with the large diameter portion 4d of the excavation bit 4 is provided on a part of the inner circumference of the casing shoe 14. Next, another inner pipe rod 3 is screwed to the rear end of the connecting tool 13 attached to the rear end of the inner pipe rod 3, and the rear end of the casing shoe 14 is tubular and has screw portions 2a at both ends for connection. The outer tube 2 is screwed on. 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 toward the inner diameter side, the rear end of the discharger head 10 and the front end of the rear end blocking portion 11 are engaged with each other to move the rear end of the discharger head 10 to the rear end. Block 11
Along with this, it is attached to the rear end of the outer tube 2. As described above, the rear end closing portion 11 closes the rear end of the outer tube 2. 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 16 for stirring the inside of the discharge tube 15 by rotating the screw 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,
An inner pipe rod mounting hole 5b having a predetermined depth that can be screwed to the rear end of the inner pipe rod 3 is provided 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. The drifter mounting hole 5a and the inner pipe rod mounting hole 5b are not communicated with each other. 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 annular groove is provided in a part of the outer circumference of the adapter 5, and a fitting 6c that engages with the annular groove of the outer circumference of the adapter is attached to the end of the swivel portion 6 with a mounting bolt 6d.
As a result, the swivel portion 6 becomes rotatable with respect to the adapter 5. Further, an annular groove is provided in 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 in a part of the outer periphery of the swivel portion 6 so as to communicate with the annular groove to form the passage 6b. To form. 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, the output shaft 7a of the drifter 7 is attached to the drifter attachment hole 5a of the adapter 5. 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. In addition, a compressor for sending air to the passage 6b of the swivel unit 6 and a foaming solution used as drilling water for sending the foaming solution to the passage 6b of the swivel unit 6 near the drilling machine 1. Locate another mobile vehicle equipped with a foam solution supply device. To excavate by driving the hole drilling device of this embodiment, the drifter 7 is driven to transmit the thrust, striking force, and rotational force from the output shaft of the drifter 7 to the adapter 5, and the excavation is performed through the inner pipe rod. The excavation bit 4 is transmitted to the bit 4 to excavate the natural ground and form a hole. When the drill bit 4 is used for drilling in this manner, the drill bit 4
The large diameter portion 4d is the stepped portion 14a of the casing shoe 14.
By pushing, the outer tube 2 is pulled and pushed from the tip. 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 passes through the discharge passage 4b and the outer periphery of the inner pipe rod 3 and the outer pipe 2
It moves backwards through the inner circumference of. 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]

As described above, according to the present invention, it is possible to provide a drilling device capable of efficiently sending sufficient foaming liquid and air to the drilling bit to improve the efficiency of drilling work. The adapter provided with the drifter mounting hole, the inner tube rod mounting hole, and the injection port, and the adapter provided with the swivel portion can stably send the foaming liquid and the compressed air even when the adapter rotates. The one in which the discharger head is screwed to the rear end of the outer tube, the discharger head is provided with the rear end closing portion, and the rear end closing portion is provided with the discharge pipe, improves the working environment,
The drilling slime collection work can be made efficient. A stirrer is provided in the discharge pipe, and a defoaming agent inlet is provided at the place where the stirrer is
Runode, drilling slime can be efficiently recovered.

[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 Obayashi Corporation Tokyo Head Office (56) Reference JP-A-4-312693 (JP, A) JP-A-5-287976 (JP, A) JP-A-2-232496 (JP, A) JP-A-2- 101284 (JP, A) Actual exploitation Sho 63-176194 (JP, U) Actual exploitation 4-82094 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21B 21/14

Claims (2)

(57) [Claims] 1. An inner pipe rod having a drill bit attached to a tip thereof, and an outer pipe connected to a long length by screw portions at front and rear ends so as to accommodate the inner pipe rod therein. The inside of the rod serves as a supply passage for sending the foaming liquid and the compressed air to the drilling bit in a mixed state, and the drilling slime and the drilling bit associated with drilling are provided between the outer periphery of the inner pipe rod and the inner periphery of the outer pipe. A drilling device provided with a slime discharge passage for discharging bubbles ejected from the outside, and a drifter for applying a thrust force, a rotational force, and a striking force to the rear end of the inner tube rod through an adapter is connected. The adapter is equipped with a swivel part that has a passage for sending foaming liquid and compressed air from the outer periphery to the supply passage of the inner pipe rod, and the screw part at the rear end of the outer pipe is held at the rear end of the outer pipe.
Screw the discharger head to protect the inner tube rod
A rear end blocking portion that projects and rotatably closes the rear end of the outer tube
Attached to the discharger head and ejected to the rear end block
A pipe should be installed, and a stirrer should be installed in the discharge pipe.
An anti-foaming agent injection port is provided at a certain point, and the foaming liquid and the compressed air are sent from the adapter to the medium supply passage of the inner tube rod without passing through the tip of the drifter. 2. An adapter is provided with a drifter mounting hole at a rear end portion thereof, the tip of the drifter is inserted into the drifter mounting hole for connection, and an inner pipe rod mounting hole is provided at a front end portion of the adapter, and the inner pipe rod mounting hole is provided. 2. The drilling device according to claim 1, wherein the inner pipe rod is inserted into and connected to the injection port, an injection port is provided on the outer circumference of the adapter, and a swivel portion connected to the injection port is provided.