JPH0434231Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a wet pneumatic impact drilling device in which a piston is moved up and down by pressurized air, and the impact energy of the piston is used to repeatedly apply impact vibration to a drill bit. In particular, the present invention relates to a wet pneumatic impact drilling device that can be used for excavating gravel, rock, etc. and underwater.

[Background of the idea]

An air hammer drill consists of a cylindrical case that supports a bit at its tip so that it can slide freely in the axial direction, and a piston that is slidably supported in the axial direction within the case and hits the bit with its lower end. . Pressure chambers are formed above and below the piston, and the upper and lower pressure chambers are alternately pressurized with pressurized air from the outside to cause the piston to move up and down continuously.

The pressurized air conventionally used to operate the piston is ejected from the tip of the bit, and this ejected air cleans the tooth tips of the bit and blows up excavated slime and the like to the ground as it digs. Air hammer drills are commonly used for rock excavation because they use compressed air and can generate high impact forces.

However, when used underwater, such conventional pneumatic impact drills suffer from various problems. For example, when drilling under water, such as in the sea, in a river, or in a dam, head pressure is applied to the tip of the bit and muddy water flows back into the air pressure chamber, making the air hammer drill inoperable. In addition, even if the water head pressure does not reach the blowing air pressure, the working air pressure is affected by this water head pressure, so the impact energy of the piston decreases, making it impossible to sufficiently impact the bit, resulting in a problem of poor excavation efficiency. . For this reason, it has been considered to return the exhaust air of the air hammer drill to the ground above the water surface so that it is not affected by the back pressure caused by the water head pressure.

In addition, in order to efficiently discharge the earth and sand excavated by the bit, the air hammer drill is tied together and a drainage passage is provided above the side of the bit, and the pneumatic impact excavation device is capable of discharging the excavated earth and sand from the drainage passage. etc. are being considered.

However, with conventional pneumatic impact drilling equipment in which such a drainage passage is not located in the center, uniform suction and removal of soil cannot be obtained, and excavation debris remains at the bottom of the hole, resulting in poor suction or blockage of the suction port. There are drawbacks that arise.

[Purpose of invention]

The present invention was developed in view of the above circumstances, and a drainage passage is provided at the center where the air hammer drills are bundled, so that there is no excavation residue left below the drainage passage, and there is no possibility of dirt being left behind due to gravel, etc. It is an object of the present invention to provide a wet pneumatic percussion excavation device in which the suction port is not blocked.

[Summary of the idea]

In order to achieve the above object, the present invention configures a drilling equipment with one or more air hammer drills having a piston operated by pressurized air from the ground and a bit struck by the piston,
In a wet pneumatic impact drilling equipment, an air supply passage for supplying pressurized air to the air hammer drill and an exhaust passage for discharging exhaust air used for operation of the air hammer drill to the ground are formed, A drainage passage having a suction port for sucking the cuttings excavated by the bit is provided in the center of excavation of the excavation device, and a part of the cutter of the bit is formed to extend downward to approximately the center position of the suction port. It is characterized by

[Example of idea]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the wet pneumatic percussion drilling equipment according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a construction drawing of a wet pneumatic percussion drilling apparatus according to the present invention, in which support piles 2 are erected on the topsoil layer 1 of the seabed, and a stage 3 is constructed. Furthermore, in order to prevent the topsoil layer 1 from collapsing, a casing pipe 4 is built up to the top of the bedrock. A leader 6 provided in the base machine 5 is erected on the stage 3, and a swivel device 8 is attached to the leader 6 via a rope 7 to a rotary drive device 9 so as to be slidable in the vertical direction. It is provided.

The swivel device 8 is attached to the lower part of the rotary drive device (power swivel) 9 and rotatably supports the pneumatic percussion type excavation device 11 according to the present invention via the digging pipe 50. The digging pipe 50 includes an air supply pipe 54 and an exhaust pipe 56
and a drain pipe 52. The air supply pipe 54 and the exhaust pipe 56 serve as passages for pressurized air, and the pressurized air is supplied to and exhausted from the air hammer drill of the pneumatic impact excavation device 11. Supply pressure air is sent from the air compressor 70 through the supply line 72 to the air supply pipe 54, and exhaust air passing through the exhaust pipe 56 is discharged from the air exhaust line 74. The excavated earth and sand passing through the drain pipe 52 is sucked into the suction pump 78 via the Rivas line 76.

Fig. 2 shows a wet pneumatic impact drilling device according to the present invention in the case where three air hammer drills and a bit are provided corresponding to each air hammer drill, and Fig. 3 is a bottom view of Fig. 2. .

In FIG. 2, the casing 10 has a drainage passage 12 in its center that communicates with a drainage pipe 52 of a dug pipe 50.
and three air hammer drills 1
4, 16, and 18 (Fig. 3) are also tied together around the drainage passage 12. The lower end of the air hammer drill 14 is fixed to the lower part of the casing 10 with a seal 20, and a bit 22 is supported slidably by a predetermined amount in the axial direction by a spline connection or the like. A piston 28 that moves up and down is arranged. Note that the other air hammer drills 16 and 18 are also configured similarly to the air hammer drill 14, although not shown.

Moreover, the casing 10 is connected to the air supply pipe 5 of the dug pipe 50.
It has an air supply passage 30 that communicates with the air supply pipe 54 to supply pressurized air to each air hammer drill, and also connects the exhaust air used to operate the piston of each air hammer drill to the passages 32 and 3 in the bit.
4. An annular passage 35 arranged in parallel to the casing 10;
37, three exhaust passages 36, 38, 40 (third
) and an exhaust passage for discharging through the upper annular passage 39 to the exhaust pipe 56 of the tunnel 50.

A recess 22 is formed on the side surface of each bit 22, 24, 26.
A, 24A, 26A are formed, and recesses 22A, 2
A ring-shaped interference member 42 is loosely fitted to 4A and 26A, and extends below the drainage passage 12 to the interference member 42. The interference member 42 is slidable in the axial direction of the drainage passage 12, and interferes with each other between the bits 22, 24, 26, so that the amount of movement in the axial direction is mutually restricted. Further, the bit 22 extends toward the center below the suction port 44 of the drainage passage 12, and is provided with a core cutter 22B for excavating the bottom of the suction port 44.

The pneumatic impact drilling equipment configured as described above first supplies pressurized air from the air supply pipe 54 to each of the air hammer drills 14, 16, 1 through the air supply passage 30.
8, the pistons of each air hammer drill are moved up and down to strike the bits 22, 24, and 26, and excavate. At this time, the core cutter 22B of the bit 22
is operated together with the bit 22 to excavate the area below the suction port 44 of the drain passage 12. Thereby, no excavation remains will be left in the lower central portion of the suction port 44. Also, the recesses 22 of each bit 22, 24, 26
A, 24A, 26A are the protrusions 4 of the hollow member 42
Since they are loosely fitted with 2A, their respective axial movements are restricted, and they each move approximately in the same way. In addition, the excavated earth and sand is sucked together with water through the drainage passage 12 by a suction pump or the like.
It passes through the drain pipe 52 and is collected on the ground side. In this case, since the suction port 44 at the lower end of the drainage passage 12 extends to the interference member 42, the suction force is high and even large stones and the like can be sucked in.

Moreover, the pressure air that operated the piston passes through passages 32 and 34 inside the bit, annular passages 35 and 37 arranged in parallel in the casing 10, three exhaust passages 36, 38, and 40, and an upper annular passage 39. The air flows to the exhaust pipe 56 and is discharged to the ground side.

FIG. 4 is a sectional view showing the structure of a second embodiment of the present invention, and FIG. 5 is a bottom view of FIG. 4, in which bits 22, 24, and 26 in FIG. The case where bits 62, 64, and 66 are provided is shown. By forming the inner thickness of the bits 62, 64, and 66 to be large, the distance L between the suction port 44 of the drainage passage 12 and the excavated ground below is made large. This increases the suction amount of excavated earth and sand. In this case as well, the bit 62 is equipped with a core cutter 62b to excavate the ground below the suction port 44. Furthermore, each bit 62,6
4, 66 have stepped portions 62C, 64C, 66 on their lower surfaces.
C is formed, reducing the weight of the bit.

FIG. 6 is a sectional view showing the structure of a third embodiment of the present invention, and FIG. 7 is a bottom view of FIG. 6. The bits of the third embodiment are provided with three bits 62 of the second embodiment. Therefore, since all three bits 62 have the core cutter 62B, it is possible to more reliably eliminate the uncut portion below the suction port.

FIG. 8 is a sectional view showing a fourth embodiment of the wet pneumatic percussion drilling apparatus according to the present invention, in which one air hammer drill is provided. Also,
FIG. 9 is a sectional view of FIG. 8.

In FIG. 8, a casing 100 has a drainage passage 102 in its center, air supply passages 104a and 104b for supplying pressurized air to the air hammer drill 98, and air hammer drill 98.
Exhaust passage 105 for discharging exhaust air from
a, 105b. This casing 10
Similarly to the casing 10 in FIG.

The difference from the device in FIG. 2 is that the casing 100
Since the exhaust passage 102 formed in the air hammer drill 98 is provided through the center of the air hammer drill 98, the air hammer drill 98 has a hollow bit 108, and the exhaust passage 109 of the air hammer drill 98 has a hollow bit 108.
is the outer wall of the drainage passage 102 and the hollow piston 106
Exhaust passages 105a, 10 are formed between the inner wall and the
It communicates with 5b. Further, the bit 108 is a single bit with four cutting edge parts 1 as shown in FIG.
08a to 108b, among which the cutting blade part 10
8a has a convex portion that protrudes toward the center of the opening of the drainage passage 102 and is used to excavate the area below the opening.

Further, FIG. 10 shows another construction drawing of the wet pneumatic percussion drilling apparatus according to the present invention. As shown in FIG. 10, an air compressor 70 installed on the ground,
The supply line 72, swivel device 8, suction pump 78 and rebus line 76 are of similar construction to that shown in FIG. The dug pipe 50 shown in FIG. 10 is connected to the swivel device 8 via a Kelly rod 80, and the Kelly rod 80 has a rectangular cross section, and has an air supply pipe, an exhaust pipe, and a drain pipe (not shown) formed inside. . The Kelly rod 80 is rotationally driven by a rotary table 82 on the ground, and this drive causes the wet pneumatic percussion drilling device 11 to rotate through the tunnel 50.
Further, the swivel device 8 is suspended by a crane using a rope 7.

Even in this construction configuration, the wet pneumatic percussion excavation device 11 can be attached to efficiently excavate earth and sand in the same manner as in the construction configuration shown in FIG.

Note that the number of air hammer drills, the number and shape of bits are not limited to those in this embodiment, and various other types can be considered.

[Effect of idea]

As explained above, according to the wet pneumatic impact drilling equipment according to the present invention, the wet pneumatic impact drilling equipment is provided with an exhaust passage, and a part of the bit of the air hammer drill is directed toward the center below the suction port of the drainage passage. Since the earth and sand below the drainage passage is excavated with the bit core cutter, even if the drainage passage is provided in the center where the air hammer drill is tied together, the earth and sand below the drainage passage will be excavated. Efficient earth removal and excavation are possible without leaving any residue or clogging with gravel.

[Brief explanation of drawings]

Fig. 1 is a construction drawing of the wet pneumatic percussion drilling equipment according to the present invention, Fig. 2 is a sectional view showing the structure of the pneumatic percussion drilling equipment according to the present invention, and Fig. 3 is the wet pneumatic percussion drilling equipment according to the present invention. 4 is a sectional view showing the structure of the second embodiment of the present invention, and FIG. 5 is a bottom view of the excavation equipment.
FIG. 6 is a sectional view showing the structure of the third embodiment of the present invention, FIG. 7 is a bottom view of the wet pneumatic impact drilling device shown in FIG.
FIG. 8 is a sectional view showing the structure of the fourth embodiment of the present invention, FIG. 9 is a bottom view of the wet pneumatic impact excavation equipment of FIG. 8, and FIG. 10 is a wet pneumatic impact excavation device according to the present invention. It is another construction drawing of the device. 10... Casing, 11... Wet pneumatic impact drilling device, 12... Drainage passage, 14, 16, 18...
...Air hammer drill, 22, 24, 26, 62,
64, 66... Bit, 22B, 62B... Core cutter, 28... Piston, 30... Air supply passage,
35, 36, 37, 38, 39, 40...Exhaust passage, 42...Interference member, 44...Suction port.

Claims (1)

[Claims for Utility Model Registration] (1) A drilling device is constituted by one or more air hammer drills having a piston operated by pressurized air from the ground and a bit struck by the piston, In a wet pneumatic impact drilling equipment, an air supply passage for supplying pressurized air to the air hammer drill and an exhaust passage for discharging exhaust air used for operation of the air hammer drill to the ground are formed, A drainage passage having a suction port for sucking the cuttings excavated by the bit is provided in the center of excavation of the excavation device, and a part of the cutter of the bit is formed to extend downward to approximately the center position of the suction port. A wet pneumatic percussion drilling rig characterized by: (2) A ring-shaped interference member is provided between each of the bits of a plurality of air hammer drills to restrict the amount of movement in the axial direction, and the drainage passage is loosely fitted into the interference member so that the bits are connected to each other in the vicinity of the bit. The wet pneumatic percussion excavation device according to claim 1, which is characterized in that it is extended in a sweeping manner. (3) The utility model registration claim No. 1 is characterized in that the suction port of the drainage passage is of a single type, penetrating through the center of the excavation, and a sealing material is attached to the inner diameter of the bit shaft so as to be able to vibrate. The wet pneumatic percussion drilling equipment according to item 1.