JP3045261B2 - Continuous drilling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous hole drilling machine for drilling a continuous hole (a slit-shaped hole having a plurality of continuous holes) in rock.

[0002]

2. Description of the Related Art Conventionally, a multi-axis earth auger is used as a device for drilling a continuous hole for forming an underground continuous wall or excavating an underground space such as an underground tank and an underground tunnel (Japanese Patent Publication No. 59-59). -18492), a number of rock drills installed in parallel on a slide frame (Japanese Patent Application Laid-Open No.
126601), the rock drills are displaced back and forth,
A device in which the rod interval is reduced with respect to the width of a rock drill (Japanese Patent Laid-Open No. 57-11693) has been proposed.

[0003]

However, in the case of using a multiaxial earth auger, it is difficult to excavate a hard rock layer. When a number of rock drills are installed in parallel on the slide frame, mounting the rock drill on the slide frame is troublesome, and the rod spacing is larger than the width of the rock drill. Requires the use of large-diameter bits, resulting in large energy loss. If the rock drill is displaced back and forth, the rod interval can be slightly reduced, but the length of the slide frame in the front-rear direction becomes large, so a long guide shell is required. Furthermore, hoses for supplying compressed air or oil to a large number of rock drills must be connected, which not only complicates piping work but also hinders work during drilling, It is easy to break.

The present invention solves the above-mentioned problem in a continuous drilling machine. Thus, the present invention can reduce the rod interval, reduce the diameter of the bit used, reduce the consumption of energy when performing the continuous hole drilling operation, without increasing the length of the slide frame in the front-rear direction. An object of the present invention is to provide a continuous drilling machine capable of facilitating drilling work by reducing the number of hoses to be connected.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a plurality of rods each having a bit attached to a front end thereof are arranged in parallel with adjacent bits being slightly displaced back and forth. In a continuous hole drilling machine inserted into the striking device, the striking device is provided with a plurality of cylinder tubes in one cylinder block, and a striking piston is slidably fitted to each cylinder tube, before and after the striking piston of each cylinder tube. It is composed of a striking block in which a switching valve for switching the traveling direction is arranged. Any number of impact blocks can be arranged side by side.

[0006]

The striking device is constituted by a striking block provided with a plurality of cylinder tubes in one cylinder block, so that the cylinder tubes can be brought close to each other.
Compared to a case where a number of rock drills are installed in parallel on a slide frame, the rock drills can be displaced back and forth and the distance between the rods can be made much smaller without lengthening the slide frame in the front-back direction. Therefore, the diameter of the bit for forming the continuous hole can be reduced, so that the energy used when performing the drilling operation of the continuous hole is reduced. Further, since a common passage for supplying and discharging the working fluid to and from the plurality of cylinder tubes can be provided in the cylinder block, the number of hoses connected to the striking device can be reduced, the piping work can be easily performed, and the hose can be easily drilled. Is less likely to interfere with the work or cause breakage of the hose.

[0007]

FIG. 1 is a plan view showing the entire structure of a continuous hole drilling machine according to one embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a partial horizontal sectional view, FIG. 5 is a sectional view taken along line 5-5 in FIG. 4, FIG. 6 is a sectional view taken along line 6-6 in FIG. 4, and FIG. 7 is a hydraulic circuit diagram of the striking block. In the drilling machine 1 of this embodiment, four rods 3 each having a bit 2 attached to the front end thereof are arranged in parallel with the adjacent bits 2 slightly displaced back and forth, and at the rear end of each rod 3. Is screwed with a shank rod 3S, and the shank rod 3S is inserted into the striking device 4. The striking device 4 has two striking blocks 5 arranged side by side. Each impact block 5 has two cylinder tubes 7 perforated in one cylinder block 6,
A switching valve device 9 that slides a striking piston 8 on each cylinder tube 7 and switches the striking piston 8 forward or backward.
Is disposed behind the cylinder tube 7. In front of the cylinder tube 7, a chuck driver 10 for rotating the inserted shank rod 3S is mounted. Two chuck drivers 10 in one impact block 5 are driven by one orbit motor 13 via a drive gear 11 and an idle gear 12. In addition,
The orbit motors 13 of the left and right striking blocks 5 rotate the bits 2 of the right and left striking blocks 5 in opposite directions by rotating in opposite directions to each other, and strike the rotational reaction forces generated when drilling into rock. Can be turned off.

As shown in FIG. 7, the impact piston 8 has a large-diameter portion 8B, a small-diameter portion 8A at the front, and a small-diameter portion 8C at the rear. And form. The rear small diameter portion 8C is the front small diameter portion 8
The diameter of the impact piston 8 on the rear oil chamber 21 side is larger than that on the front oil chamber 20 side. Pressure oil is supplied to the front oil chambers 20 on both sides in the impact block 5 from a common high-pressure oil passage 22 </ b> C of the high-pressure circuit 22. Valve plug 2 fitted to switching valve device 9
Reference numeral 3 denotes a valve chamber 25 in which a central portion communicates with the high-pressure circuit 22 and a cylindrical switching valve 24 is slidably fitted between an outer periphery thereof and the cylinder block 6.

The valve chamber 25 has a low-pressure port 26 at its rear end.
A supply / discharge port 27, a low-pressure port 28, a valve control port 29, and a low-pressure port 30 are provided at the front end in that order. The supply / discharge port 27 is connected to the rear oil chamber 2 by a supply / discharge passage 35.
1 and the low pressure ports 26, 28 and 30 are connected to the common low pressure oil passage 31C of the low pressure circuit 31, and the valve control port 2
9 is connected to a control port 33 and a second control port 34 provided at the front of the cylinder tube 7 by a valve control passage 32. Inside the valve chamber 25, an oil supply chamber 37 that is always in communication with the high-pressure circuit 22 via an oil supply hole 36 formed in the valve plug 23 is provided. The outer periphery of the switching valve 24 is stepped so as to have a large diameter at the rear, and a valve regulating oil chamber 38 is formed at this step, and the inner periphery of the switching valve 24 has a stepped portion having a small diameter at the front. The valve control oil chamber 39 is formed at this step. The pressure receiving area on the valve control oil chamber 39 side is larger than the pressure receiving area on the valve control oil chamber 38 side. The switching valve 24 is provided with an oil supply hole 40 for communicating the supply / discharge port 27 and the oil supply chamber 37 at the forward position, and an oil discharge groove 41 for communicating the low pressure port 28 and the supply / discharge port 27 at the retracted position. Further, a valve control hole 42 for communicating the valve control port 29 with the valve control oil chamber 39 is formed. Valve regulated oil chamber 3
8 is always in communication with the high voltage circuit 22. As described above, the cylinder tube 7 is provided with the control port 33 and the second control port 34, and the oil discharge port 4 connected to the tank via the common low-pressure oil passage 31C of the low-pressure circuit 31 behind the control port 33 and the second control port 34.
3 are provided. The large diameter portion 8 </ b> B of the striking piston 8 is provided with a groove 44 that allows the second control port 34 to communicate with the oil drain port 43 at the forward position of the striking piston 8. The high-voltage circuit 22 and the low-voltage circuit 31 are provided with a high-pressure accumulator 45 and a low-pressure accumulator 46, respectively.

When the switching valve 24 is in the forward position, the supply / discharge port 27 and the oil supply chamber 37 communicate with each other through the oil supply hole 40, so that the rear oil chamber 21 and the front oil chamber 20
Communicate with the high voltage circuit 22 together. Since the pressure receiving area on the rear oil chamber 21 side of the impact piston 8 is larger than the pressure receiving area on the front oil chamber 20 side, the impact piston 8 moves forward. In this state, the control port 33 is open to the front oil chamber 20 side, and the second control port 34 is connected to the large-diameter portion 8B of the striking piston 8.
, The valve control oil chamber 39 communicating with the front oil chamber 20 via the valve control passage 32 has a high pressure. Therefore, both the valve regulating oil chamber 38 and the valve control oil chamber 39 are at high pressure, and the pressure receiving area on the valve control oil chamber 39 side is larger than the pressure receiving area on the valve regulating oil chamber 38 side. Is held in.

When the striking piston 8 moves forward, the control port 33 is closed by the large diameter portion 8B of the striking piston 8, and the second control port 34 communicates with the oil discharge port 43 through the groove 44. , The pressure in the valve control oil chamber 39 becomes low. At this time, since the valve regulating oil chamber 38 remains at a high pressure, the switching valve 24 moves backward. When the switching valve 24 retreats, the oil supply hole 40 closes and the oil supply / discharge port 27 communicates with the low pressure port 28 via the oil drain groove 41, so that the rear oil chamber 21 communicates with the low pressure circuit 31. The striking piston 8 that has moved forward hits the rear end of the shank rod 3S and stops moving forward, and starts retreating because the rear oil chamber 21 has a low pressure.

When the impact piston 8 is retracted, the control port 33 is opened to the front oil chamber 20 side, and the second control port 34 is closed by the large diameter portion 8B of the impact piston 8, so that the control port 33 is closed via the valve control passage 32. Valve control oil chamber 3 communicating with front oil chamber 20
9 again becomes high pressure and the switching valve 24 moves forward. Switching valve 2
When the front 4 moves forward, the rear oil chamber 21 communicates with the high-pressure circuit and the pressure rises. Therefore, the striking piston 8 that tries to continue retreating due to inertia is stopped by braking and enters the forward travel again. Thereafter, the same cycle is repeated.

The striking device 4 is constituted by juxtaposing the striking blocks 5 in which two cylinder tubes 7 are provided in one cylinder block 6, so that the cylinder tubes 7 can be brought close to each other. Compared with the construction in which the rock drills are installed in parallel on the slide frame, the distance between the rods 3 is much smaller without displacing the rock drills back and forth and lengthening the slide frame in the front-rear direction. Therefore, the diameter of the bit 2 for forming the continuous hole is small, and the energy used when performing the operation of drilling the continuous hole is reduced. Further, since the common high-pressure oil passage 22C and the common low-pressure oil passage 31C for supplying and discharging the working fluid to and from the two cylinder tubes 7 are provided in the cylinder block 6, the number of hoses connected to the striking device 4 can be reduced, and the piping work can be reduced. This is easy to perform, and the possibility that the hose hinders the work at the time of drilling or breakage of the hose is reduced.

[0014]

As described above, the continuous hole drilling machine of the present invention can reduce the rod interval and the diameter of the bit used without lengthening the slide frame in the front-rear direction.
Energy consumption when performing the continuous hole drilling operation can be reduced. In addition, the number of hoses to be connected is reduced, so that piping work is easy, and the hole work can be easily performed with less risk that the hose hinders the work at the time of drilling or that the hose is damaged.

[Brief description of the drawings]

FIG. 1 is a plan view showing an entire configuration of a continuous hole drilling machine according to an embodiment of the present invention.

FIG. 2 is a side view showing the entire configuration of the continuous hole drilling machine of the present invention.

FIG. 3 is a partial horizontal sectional view of a continuous drilling machine.

FIG. 4 is a longitudinal sectional view of a continuous hole drilling machine.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 of FIG. 4;

FIG. 7 is a hydraulic circuit diagram of a striking block.

[Explanation of symbols]

 Reference Signs List 1 drilling machine 2 bit 3 rod 4 hitting device 5 hitting block 6 cylinder block 7 cylinder tube 8 hitting piston 9 switching valve device

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E21B 1/00-3/06

Claims (2)

(57) [Claims] 1. A continuous hole drilling machine in which a plurality of rods each having a bit attached to a front end thereof are arranged in parallel with adjacent bits slightly displaced back and forth, and each rod is inserted into a striking device. The striking device comprises a striking block in which a plurality of cylinder tubes are provided in one cylinder block, a striking piston is slidably fitted to each cylinder tube, and a switching valve for switching the striking piston of each cylinder tube forward and backward is arranged. A continuous hole drilling machine characterized by being made. 2. The drilling machine according to claim 1, wherein the hitting device comprises a plurality of hitting blocks arranged side by side.