JP2003097178A - Boring method and swivel-cum-coupling joint for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boring method for performing the boring while injecting the air bubble with the air from a boring bit, capable of discharging the mud with the air bubble without attaching the mud to a borehole wall even in a case of the ground of high content of mud. SOLUTION: In this boring method for performing the boring while injecting the air, air bubble, liquid and/or liquid mist from the boring bit formed on a tip of a boring rod 16, the granulated matter 13 is injected from the boring bit with the air, air bubble, liquid and/or liquid mist for allowing the granulated matter to capture the slurry chips in a process of the flowing-out of the granulated matter to the outside of the borehole, whereby the discharging of the slurry chips is urged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drilling an explosive charge hole for tunnel excavation by blasting, a rock bolt hole for stabilizing the ground, and a swivel / coupling joint therefor.

[0002]

2. Description of the Related Art Conventionally, in drilling work by a drilling machine, a large amount of water is jetted from the drilling bit in order to prevent cooling of the drilling bit, discharge of cutting powder and generation of dust. There is.

However, there is a problem that a large amount of water can be used for drilling, because of concern about collapse of the hole, it is limited to high-quality ground with few cracks and less mud content. On the other hand, if compressed air is used in place of water, there are problems that the amount of dust will increase and the drilling work environment will deteriorate, and the temperature of the bit will rise, shortening its life.

In order to deal with such a problem, Japanese Patent Publication No. 6-10395, Japanese Patent Publication No. 6-60553 and Japanese Patent No. 2765264 disclose various drawbacks when water or compressed air is used alone. In order to eliminate all of the above, by mixing bubbles in the compressed air,
There have been proposed methods for perforating cutting powder into a slurry.

[0005]

However, in the case of a rock containing a large amount of sandy matter such as sandstone, since the viscosity is low, the cut matter is generally slurried and discharged to the outside of the hole, but this is not a problem. It was found that when drilling rocks containing a large amount of mud, such as silt rocks and mudstones, they tend to stick and deposit on the pore wall due to the water content of the bubbles due to their properties.

Even if the inside of the hole is closed due to the clay accumulated on the hole wall, once a slight crack-shaped discharge path is formed, the slurry-like cutting powder is discharged from the discharge path to the hole wall. Sometimes mud remained deposited.

Therefore, a main object of the present invention is to provide a drilling method in which any one or a plurality of air, liquid, and atomized liquid are ejected from the drilling bit to carry out drilling in the case of a large amount of mud. Even if there is, it is an object of the present invention to provide a drilling method capable of discharging the slurry-like cutting powder together with air bubbles without adhering to the hole wall, and a swivel / coupling joint therefor.

[0008]

In order to solve the above problems, according to the present invention as set forth in claim 1, any one or a plurality of air, bubbles, liquid and atomized liquid are ejected from a drill bit at the tip of a drill rod. In the perforation method in which the perforation is performed while performing the perforation, the powder or granules are ejected from the perforation bit together with one or more of the air, bubbles, liquid, and atomized liquid, and the powder or granules flow out of the hole. There is provided a perforation method characterized in that the discharge of the slurry-like cutting powder is promoted by capturing the slurry-like cutting powder in the process.

According to a second aspect of the present invention, there is provided the perforation method according to the first aspect, wherein a valve is provided in the feed line of the powder or granules so that mixing and stopping of the powder or granules can be arbitrarily switched. .

According to a third aspect of the present invention, in the middle of the perforated rod, a branch passage is formed from the inside of the rod to the outside of the rod, and the flow passage direction is reversed to direct the discharge port toward the hole mouth side. 3. The perforation method according to claim 1, wherein any one or a plurality of the bubbles, the liquid, and the atomized liquid and a part of the powdery material are ejected from the flow dividing channel to the outside. Provided.

In the present boring method, the powdery particles are ejected from the boring bit together with the air and the air bubbles. This particulate matter catches slurry cutting powder by adhesion or the like during the discharge process and promotes discharge to the outside of the hole, so that it is possible to prevent the mud content from accumulating on the hole wall.

On the other hand, as a fourth aspect of the present invention, a coupling joint body having a shank rod as a driving shaft for rotation connected to one end side thereof and a perforation rod connected to the other end side thereof, and the cup. A swivel having a first inlet for air, air bubbles, liquid, and atomized liquid and a granular material is externally fitted to the outer periphery of the ring joint body, and flows in from the first inlet. Done air,
One or more of bubbles, liquids and atomized liquids,
The powdery or granular material is made to flow into the hollow passage from the rear end surface of the perforating rod via a passage formed in the coupling joint body.
A swivel / combined coupling joint for use in the drilling method according to any one of 3 to 3 is provided.

According to a fifth aspect of the present invention, a second inlet for cooling water is formed in the swivel, and the cooling water flowing from the second inlet is supplied to the connecting portion of the shank rod. A swivel-combined coupling joint according to claim 4 is provided.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view of a drilling method according to the present invention, and FIG. 2 is a side view of a drilling machine equipped with an apparatus using the drilling method.

As shown in FIG. 1, in this punching device, the compressed air sent from the compressor 1 is pressurized by the pressure boosting unit 2, 2.
After being increased in pressure by 2, the air feed line 10 is sent to the perforation apparatus M through the mixers 3 and 3, and the air bubble generating solution feed line 11 that joins in the mixer 3 is further illustrated. In the example, a pressure feed line 12 for powder particles 13 mixed in at a position downstream of the mixer 3 is formed, and after the bubble generating solution is bubbled in the mixer 3, the powder particles are Thirteen
Are mixed with the air and supplied to the punching device M and ejected from the punching bit 16.

More specifically, the compressor 1 of the air feed line 10 has a weight of about 4 to 8 kg.
Compressed air of about f / cm ² is generated, the supply pressure is doubled by the pressure boosting unit 2, and then sent to the perforating apparatus M via the mixer 3. On the other hand, the bubble generating solution feed line 1
In 1, the bubble-generating stock solution such as a surfactant is 0.5 to 5.0.
The bubble generating solution diluted with water so as to have a dilution rate of% is stored in the solution tank 5 and is fed by the metering pump 6 in fixed amounts. At this time, the feed rate is controlled by the flow meter 7, and the feed rate can be adjusted by the flow rate adjusting valves 8, 8 provided in the middle of the line. The amount of the bubble-generating solution fed is generally 0.5 to 10 L / min, preferably 3
It is adjusted to about 5 L / min.

In the pressure-feeding and feeding line 12 for the powdery or granular material 13, the powdery or granular material 13 stored in the tank 14 is cut out by a constant amount by a constant amount feeding device such as a rotary feeder, and the pressure-feeding is sent from the compressor 1. It is transported by air. An on-off valve 15 is provided in the middle of the pressure-feeding and feeding line 12 for the powder and granules 13.
It is possible to arbitrarily switch between mixing and stopping. It should be noted that the mixture of the powdery particles into the air supply line may be merged by the attraction by the Venturi tube.

As the powdery or granular material 13 usable in the present invention, any powdery or granular material such as spherical or porous material can be used as long as the slurry can be adhered thereto, but it is particularly easy to capture the slurry. In addition, a cylindrical powdery or granular material 20 as shown in FIG. 5 (A) or a powdery or granular material 21 having a C-shaped cross section as shown in FIG. 5 (B) is preferably used. As the material,
A metal material such as steel or stainless steel or a ceramic material such as aluminum nitride or aluminum silicate is desirable, but carbon fiber reinforced plastic or glass fiber may be used as long as it has a strength not to be crushed by the captured cutting powder. It may be a polymeric material such as reinforced plastic. In addition, for example, limes, etc., which have an action of hardening cohesive soil, plant-made rice husks, processed products of seaweed fibers, and the like can also be used as the granular material.

On the other hand, the punching device M used for punching is provided with a drifter 9 which is mounted on a guide leader (not shown) so as to be able to move forward and backward, and a drilling hole which is connected to the drifter 9 through a shank rod 22 and which is provided at the tip. The device comprises a piercing rod 23 having a bit 16. When selecting a model,
Of course, it is necessary to select one that has a striking pressure, rotation pressure, and feed pressure that are suitable for the geology.
Various types of 6 can be used. Among them, the shape of the cross bit as shown in FIG. 4 is particularly suitable, and it is desirable to weld the center hole 16a to use it in order to prevent the flushing hole 16A from being blocked.

The shank rod 22 and the piercing rod 23
Are connected via a swivel / combining coupling joint 24 from which the air, air bubbles, and powders are pierced.
It is designed to flow in.

As shown in FIG. 6, the swivel / coupling joint 24 has a female thread portion 25 to which the shank rod 22 serving as a driving shaft for rotation is connected on one end side.
and a coupling joint main body 25 having a female screw portion 25b to which the piercing rod 23 is connected on the other end side, and the coupling joint main body 25.
, Which is fitted around the outer periphery of the swivel 26, and an appropriate number of O-rings 27, 27 ... Are arranged on the boundary surface between the coupling joint body 25 and the swivel 26 to ensure watertightness. It is like this.

The swivel 26 is provided with a first inlet 26a for air, air bubbles and the powder / grain material 13, and
A second inlet 26b for cooling water and a partition 28
It has the 1st annular flow path 29 and the 2nd annular flow path 30 which were divided into. On the other hand, the coupling joint body 2
5 is formed with a first flow passage 25c communicating with the first annular flow passage 29 and with the bottom of the female screw portion 25b, and further from the second annular flow passage 30 to the female screw portion 25a.
The second flow path 25d is formed to reach the side surface of the.

Therefore, the air, the air bubbles, and the particulate matter 13 flowing from the first inflow port 26a pass through the first annular flow path 29 and the first flow path 25c from the rear end surface of the piercing rod 23 to the piercing rod. The cooling water that has flowed into the hollow passage of No. 23 and has flowed from the second inflow port 26b is the second annular flow passage 3
It is adapted to be supplied from 0 to the threaded portion of the shank rod 22 via the second flow path 25d. The first
The flow path 25c is a flow path that opens in a fan shape as shown in FIG. 7 so that air, air bubbles, and particulate matter can easily flow in.

In order to allow only fluids such as air and water to flow into the boring rod 23, like a normal swivel,
The fluid may be made to flow through a hole formed on the side surface of the rotating rod via the swivel, but in the case of this method, since the powder and granules 13 also need to be made to flow into the drilling rod 23, By adopting the above-described structure, the powdery or granular material 13 that is difficult to flow in is caused to flow into the hollow passage from the rear end surface of the drill rod 23. On the other hand, shank rod 2
Since No. 2 is likely to be damaged by heating, cooling water stored in the water tank 35 is supplied to cool the screw part (screwed part) to prevent the damage.

By the way, the air, air bubbles, and the granular material 1
In addition to ejecting from the perforation bit 16, 3 is provided with an intermediate injection part 31 in the middle of the perforation rod 23, as shown in FIG. You may make it spout toward the mouth side. As shown in detail in FIG. 9, the intermediate injection unit 31 has a connecting portion for the base end side drilling rod 23A on one end side and a connecting portion for the tip end side drilling rod 23B on the other end side, A member interposed between the perforated rods 23A and 23B. The plurality of branch channels 31 extend from the inside of the rod to the outside of the rod, reverse the flow channel direction, and direct the discharge port toward the hole mouth side.
With the members formed with a, 31a, ..., Slurry cutting powder can be efficiently discharged to the outside of the hole by ejecting the powder and granules 13 from the intermediate point of the rod. The branch channel 31
An adjusting valve 32 such as a screw may be provided on each of a and 31a for adjusting the ejection amount.

The complete drilling system described above is installed in and integrally installed in a drilling machine such as a wheel jumbo. For example, as shown in FIGS. 2 and 3, the pump unit 4 is installed at the rear of the wheel jumbo 17 via the bracket 18 on the left side of the rear surface, and the booster unit 2 is installed on the right side thereof. The mixer 3 is attached to the front part of the driver's seat 19 and is connected to the perforation device M at the frontmost part.

When performing punching by such a punching device, first, the compressed air sent from the compressor 1 is boosted by the pressure boosting unit 2, and then the punching bit 16 of the punching device M.
To spray from. In this state, operate the metering pump 6,
Immediately before the spot facing, the flow rate adjusting valves 8 and 8 are opened, the bubble agent solution is fed into the mixer 3, and the bubble generating solution is bubbled by the generation of turbulent flow due to collision. The air and air bubbles flow into the boring rod 23 through the swivel / coupling joint 24 and are ejected from the boring bit 16.
When it is visually confirmed that bubbles are ejected from the perforation bit 16 of the drifter 9, the perforation is started.

The cutting powder is mixed with air bubbles to form a slurry. If it seems that the mud and soil are attached to the hole wall due to the stickiness of the slurry cutting powder discharged at this time,
The on-off valve 15 is opened so that the powder and granules 13 are mixed into the air and bubble supply lines and ejected from the perforation bit 16. The powder particles 13 ejected into the perforations capture the slurry-like cutting powder by adhesion or the like during the discharge process and promote the discharge to the outside of the hole, so that the mud content can be prevented from accumulating on the hole wall. become.

After the completion of perforation, the flow rate adjusting valves 8 and 8 are
Closed, and the punching rod 23 is pulled out together with the drifters 9, 9, and then the flushing hole 16A of the drilling bit 16 is removed.
After confirming whether or not is blocked, the metering pump 6 is stopped and the perforation is finished.

By the way, in the above example, the air bubbles are ejected from the perforation bit together with the air.
Any one or a plurality of liquids and atomized liquids may be combined and ejected.

[0031]

As described above in detail, according to the present invention, in the drilling method in which any or a plurality of air, bubbles, liquid and atomized liquid are ejected from the drill bit, the mud content is Even in the case of many grounds, it becomes possible to discharge the slurry-like cutting powder without adhering mud to the hole wall.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a punching system according to the present invention.

FIG. 2 is a side view when the punching system is mounted on a wheel jumbo 17.

FIG. 3 is a rear view thereof.

FIG. 4 is a front view of the bit 16.

5 (A) and 5 (B) are diagrams showing an example of the shape of a powder or granular material.

FIG. 6 is a vertical cross-sectional view of a swivel / coupling joint 24 portion.

FIG. 7 is a view taken along the line VII-VII in FIG.

FIG. 8 is a schematic diagram in the case of ejecting powdery or granular material from the middle of a punching rod.

FIG. 9 is a vertical sectional view showing the structure of the intermediate injection unit 30 at that time.

[Explanation of Codes] 1 ... Compressor, 2 ... Pressure boosting unit, 3 ... Mixer,
4 ... Pump unit, 5 ... Solution tank, 6 ... Metering pump, 7 ... Flow meter, 8 ... Flow rate adjusting valve, 9 ... Drifter, 10 ... Air feeding passage, 11 ... Bubble generating solution feeding line, 12 ... Powder Granules pressure feed line, 13 ... powder granules, 1
5 ... On-off valve, 16 ... Drilling bit, 22 ... Shank rod, 23 ... Drilling rod, 24 ... Swivel / combining coupling joint, 26 ... Water tank, 31 ... Intermediate injection unit

Claims (5)

[Claims] 1. A drilling method for making a hole while ejecting any or a plurality of air, bubbles, liquid and atomized liquid from a drill bit at the tip of a rod, said air, bubbles, liquid and atomized liquid. With any one or more of the above, by ejecting the powdery or granular material from the boring bit and capturing the slurry-like cutting powder in the process in which the powdery or granular material flows out of the hole, discharge of the slurry-like cutting powder A perforation method characterized in that the perforation is promoted. 2. The punching method according to claim 1, wherein a valve is provided in the powder / granule feed line so that mixing / stopping of the powder / granulate can be arbitrarily switched. 3. The air, the air bubble, the liquid and the mist are formed in the middle of the perforated rod to form a branch passage extending from the inside of the rod to the outside of the rod and reversing the direction of the passage to direct the discharge port toward the hole mouth side. The perforation method according to claim 1, wherein any one or a plurality of the liquid droplets and a part of the powdery or granular material are ejected to the outside from the flow dividing channel. 4. A coupling joint main body having a shank rod as a driving shaft for rotation connected to one end side thereof and a perforating rod connected to the other end side thereof, and air and air bubbles on the outer periphery of the coupling joint main body. A swivel having a first inflow port for one or more of the liquid and the atomized liquid and the powder and granules is fitted on the outer surface of the swivel, and air, bubbles, liquid, and an atomized state flown from the first inflow port. One or more of the liquids and the granular material are made to flow into the hollow passage from the rear end surface of the piercing rod via the passage formed in the coupling joint body. A swivel / combined coupling joint for use in the drilling method according to claim 1. 5. The swivel as claimed in claim 4, wherein a second inlet of cooling water is formed in the swivel, and the cooling water flowing in from the second inlet is supplied to the connecting portion of the shank rod. Coupling joint.