JPH0788740B2 - Double pipe underground drilling device with air hammer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double pipe underground drilling device with an air hammer.

[0002]

2. Description of the Related Art As a prior art of a double pipe type underground drilling device with an air hammer, there is one shown in FIG. 6, which is as follows. An air hammer 10 is provided in the inner pipe 101 for leading.
2 is provided internally, and an exhaust outlet of the air hammer 102 is opened in a drill bit 103 attached to the tip of the leading inner pipe 101. An air outlet pipe 106 of an air supply rotary joint 105 is provided at a base end portion of the leading inner pipe 101 and a base end portion of a replenishing inner pipe 104 which is added to the leading inner pipe 101.
The air supply passage 107 for supplying air from the air outlet pipe 106 to the air hammer 102 is provided in the leading inner pipe 101 and the refilling inner pipe 104.

The earth discharge inlet pipe 111 of the earth discharging rotary joint 110 can be attached to and detached from the base end portion of the leading outer pipe 108 and the base end portion of the replenishing outer pipe 109 which is added to the leading outer pipe 108, respectively. I have to. The inner diameters of both outer pipes 108 and 109 are set so that the soil discharge passage 112 can be held around the inner pipes 101 and 104 fitted inside the outer pipes 108 and 109, respectively.

In the double pipe underground drilling device having such a structure, the boring machine 113 is used to carry out the drilling in the next step. First, as shown in FIG. 7 (A), the leading inner and outer pipes 101 and 108 are connected to the lower sides of the air supply rotary joint 105 and the soil discharge rotary joint 110, respectively.
As shown in (B), while lowering the slider 114 of the boring machine 113, the leading inner and outer pipes 101, 108
Intrude into the ground.

Next, as shown in FIG. 7 (C), while the leading inner and outer pipes 101 and 108 are left in the ground, the air supplying rotary joint 105 and the earth removing rotary joint 110 are connected to these pipes.
And the connecting inner and outer pipes 104 and 109 are connected to the joints 105 and 110, respectively, and as shown in FIG. 7D, the connecting inner and outer pipes 104 and 109 are connected to the leading inner and outer pipes 101 and 108. Add Then, in the same manner as in the case of FIG. 7B, the leading inner and outer tubes 101 and 108 are further deeply penetrated into the ground while lowering the slider 114.
Then, in the same manner, the inner and outer pipes 10 for replenishment are successively added.
4.109 is added to make a hole to a predetermined depth.

In the double pipe underground drilling device having the above structure, when drilling, as shown in FIG. 6, air is supplied from a predetermined compressor 115 as shown by arrows 116 and 117.
While supplying the air hammer 102 through the air supply rotary joint 105 and the air supply passage 107 in order, the drill bit 103 is rotated to propel the lead inner / outer pipes 101/108 and the inner / outer pipes 104/109 for supplementation. And let
The earth and sand cut by the drill bit 103 is arrow 118/11
As shown in FIG. 9, the exhaust air discharged from the exhaust gas ejection port of the drill bit 103 is used to discharge the soil from the soil passage 112 and the rotary joint 110 for soil discharge.
The soil will be discharged through and.

By the way, in this prior art, the base end portion of the leading inner pipe 101 and the base end portion of the refilling inner pipe 104 are respectively rotatably inserted into the earth discharging rotary joint 110, as shown in FIG. ), The earth removal rotary joint 110
The upper end of the inner pipe 101 for leading, which is projected to the upper side, is constrained to a chuck mechanism, which is provided in a slider 114 of a boring machine 113, and is rotatable, and the rotation of the chuck mechanism is drilled through the inner pipe 101 for leading. Transmit to bit 103.

In the case of FIG. 7 (D), the proximal end portion of the inner pipe 104 for addition, which is protruded to the upper side of the earth removal rotary joint 110, is constrained by a chuck mechanism provided in the slider 114 to chuck the earth. The rotation of the mechanism is transmitted to the drill bit 103 via the inner pipe for addition 104 and the inner pipe for leading 101 in order.

In this case, a propulsive force is directly applied to the leading inner tube 101 and the additional inner tube 104 by the lowering of the slider 114. On the other hand, as shown in FIG. 6, the propulsion force is transmitted from the inner guide pipe 101 to the outer guide pipe 108 and the outer pipe 109 for replenishment via the propulsive force transmitting portion 120. This propulsion force transmission unit 120
Consists of an upward step 121 provided inside the tip of the leading outer tube 108 and a downward step 122 provided around the drill bit 103. The downward step 122 is connected from the upper side of the upward step 121. I have been hit.

[0010]

In the above prior art, the base end portion of the leading inner pipe 101 and the base end portion of the replenishing inner pipe 104 can be rotatably inserted into the earth discharging rotary joint 110, respectively. In the case of FIG. 7 (A), the base end portion of the leading inner pipe 101 protruding above the earth removal rotary joint 110 is constrained to a rotation drivable chuck mechanism provided in a slider 114 of the boring machine 113. And also FIG.
In the case of (D), the base end portion of the refilling inner pipe 104 protruding above the earth removing rotary joint 110 is attached to the slider 114.
Since it is designed to be restrained by the chuck mechanism provided inside, the earth removal rotary joint 110 is always arranged below the slider 114.

Since there is a limit to the height of the slider 114, there is also a limit to the arrangement height of the earth removal rotary joint 110 below it. Therefore, as shown in FIG. 7 (A), the set dimension of the outer pipe 108 for leading is the distance 124 from the lower end of the soil discharge inlet pipe 111 of the rotary joint 110 for soil discharging at the upper limit height to the ground surface 123. Limited to a short range. Also, FIG.
As shown in (D), the set dimension of the extension outer pipe 109 is from the lower end of the soil discharge inlet pipe 111 of the soil discharging rotary joint 110 at the upper limit height position to the upper end of the underground outer pipe 108 for leading. Is shortly limited to the range 125. Along with this, the set dimensions of the leading inner pipe 101 and the refilling inner pipe 104 are also set to the leading outer pipe 108 and the refilling outer pipe 10.
Limited to short lengths corresponding to 9 set dimensions.

As described above, in the above-mentioned conventional technique, the inner and outer pipes 101 and 108 for leading and the inner and outer pipes 104 and 10 for replenishing are added.
Since the set size of 9 is limited to be short, the number of complicated replenishment work is large and the work efficiency of the drilling work is low when drilling a predetermined depth.

An object of the present invention is to eliminate restrictions on the size setting of the leading inner and outer tubes and the additional inner and outer tubes.

[0014]

The present invention is premised on the following configuration. An air hammer 2 is provided inside the leading inner pipe 1 and a drill bit 3 attached to the tip of the leading inner pipe 1.
The exhaust outlet of the air hammer 2 is opened. The inner pipe 4 for replenishment is configured to be replenishable to the base end portion of the inner pipe 1 for lead. An air outlet pipe 6 is rotatably provided to a rotary joint 5 for supplying air, and the air outlet pipe 6 is detachably connected to the base end portion of the leading inner pipe 1 or the replenishing inner pipe 4 to remove air. The air discharged from the outlet pipe 6 can be supplied to the air hammer 2 through the air supply passage 7 formed in the inner pipes 1 and 4.

The outer pipe 9 for addition is constructed so that it can be added to the base end of the outer pipe 8 for leading, and each outer pipe 8
The inner pipe 9 is formed to have a larger inner diameter than the outer pipes 1 and 4, and the outer pipe 8 is provided with the earth discharging passage 12 interposed around the inner pipes 1 and 4.
・ 9 is fitted onto the inner tubes 1 and 4. Rotary joint for soil removal 1
0 is provided with a soil discharge inlet pipe 11 rotatably, and the soil discharge inlet pipe 11 is detachably connected to the base end portion of the outer pipe 8 for lead or the outer pipe 9 for addition, and the outer pipe 8 for lead is provided. The earth and sand that have entered into the earth discharging passage 12 from the tip of are discharged through the earth discharging passage 12 and the earth discharging inlet pipe 11 in order.

The present invention is premised on the above configuration, and as shown in FIGS. 1 (A), (B), and (C), for example, a soil discharge inlet pipe 1
1 and the air outlet pipe 6 are configured so that they can be interlockingly connected by the rotation transmission portion 13, and the rotational force applied to the leading outer pipe 8 or the replenishment outer pipe 9 is applied to the soil discharge inlet pipe 11 and the rotation transmission portion 1.
3 and the air outlet pipe 6 can be transmitted to the leading inner pipe 1 in order.

[0017]

The present invention operates as follows, as shown in FIGS. 1, 4 and 5, for example. First, the inner and outer tubes for lead 1.8
A case where the perforation is performed only by using the method will be described. That is, the outer pipe 8 for leading is externally fitted to the inner pipe 1 for leading, and the rotary joint 10 for earth removal is used.
The base end of the leading outer pipe 8 is connected to the soil discharge inlet pipe 11 and the base end of the leading inner pipe 1 is connected to the air outlet pipe 6 of the rotary joint 5 for air supply. Furthermore, FIG. 1 (B)
As shown in (C), the soil discharge inlet pipe 11 and the air outlet pipe 6 are connected by the rotation transmission portion 13. In this state,
As shown in (A), the chucking mechanism of the slider 15 of the boring machine 14 restrains the middle portion of the leading outer tube 8 in the longitudinal direction. Next, when a rotational force is applied to the outer pipe 8 for leading by this chuck mechanism, this rotational force is applied from the outer pipe 8 for leading to the soil discharge inlet pipe 11, the rotary transmission portion 13, the air outlet pipe 6, the inner pipe for leading. 1 is sequentially transmitted to the drill bit 3, and the drill bit 3 rotates to drill the ground.

Then, as shown in FIG. 4B, when the slider 15 of the boring machine 14 is lowered, the leading inner and outer pipes 1 and 8 enter the ground, and the slider 15 is lowered to the lower end. As shown in (C), the restraint of the chuck mechanism of the slider 15 is released and the slider 15 is raised while the leading inner and outer pipes 1 and 8 are penetrated into the ground. Next, the chucking mechanism of the slider 15 restrains the proximal end portion of the outer pipe 8 for leading, and the slider 15 is lowered again as shown in FIG. It penetrates into the ground to the edge.

Subsequently, a case will be described in which the leading inner and outer pipes 1 and 8 are replenished with the inner and outer pipes 4 and 9 for reaming. That is, in the state where the outer pipe for leading 8 and the outer pipe for extending 9 are fitted onto the inner pipe for leading 1 and the inner pipe for adding 4 respectively, the outer pipe for extending 9 is connected to the base end portion of the outer pipe for leading 8. Then, the base end portion of the replenishment outer pipe 9 is connected to the soil discharge inlet pipe 11. Further, the inner pipe 4 for replenishment is connected to the base end portion of the inner pipe 1 for leading, and the base end portion of the inner pipe 4 for replenishment is connected to the air outlet pipe 6. Furthermore, the soil discharge inlet pipe 11 and the air outlet pipe 6 are connected by the rotation transmission portion 13. In this state,
As shown in (C), the chucking mechanism of the slider 15 of the boring machine 14 restrains the midway portion of the extension outer pipe 9 in the longitudinal direction. Subsequently, when a rotational force is applied to the supplementary outer pipe 9 by the chuck mechanism, the rotational force is applied from the supplementary outer pipe 9 to the soil discharge inlet pipe 11, the rotary transmission portion 13, the air outlet pipe 6, and the supplementary inner pipe 4. , Leading inner tube 1
Is transmitted to the drill bit 3 in order to rotate the drill bit 3 to drill the ground. And FIG.
As shown in (D), by lowering the slider 15 of the boring machine 14, the additional inner and outer tubes 4.9 and the leading inner and outer tubes 1.8 penetrate into the ground. The rotary transmission unit 1
When the connection between the soil discharge inlet pipe 11 and the air outlet pipe 6 by 3 is released, for example, the leading inner pipe 1 and the leading outer pipe 8 and the extending outer pipe 9 are left in the ground. It is possible to extract only the inner tube 4 for use from the outer tube 8 for leading and the outer tube 9 for addition.

[0020]

The present invention has the following effects because it is configured and operates as described above. When the outer pipe for lead and the outer pipe for replenishment are rotated, this rotating force is transmitted to the inner pipe for lead through the soil discharge inlet pipe, the rotary transmission part, and the air outlet pipe in order, and the drill bit rotates. The drill bit can be rotated by restraining and rotating any part of the outer peripheral surface of the leading outer tube or the replenishing outer tube by the chuck mechanism of the slider of the machine. That is,
In the case of the conventional one in which the leading inner pipe provided with a drill bit or the inner pipe for replenishment is constrained and rotated by the chuck mechanism of the slider of the boring machine to rotate the drill bit, it is constrained by the chuck mechanism of the slider of the boring machine. Possible points are only the upper end portion of the leading inner pipe or the leading inner pipe exposed above the leading outer pipe or the leading outer pipe. Therefore, if the dimensions of the outer pipe for lead and the outer pipe for add-on are too long, the slider of the boring machine will not reach the inner pipe for lead and the inner pipe for add-on. The pipe cannot be restrained and the drill bit cannot be rotated.

On the other hand, according to the present invention, in order to rotate the drill bit, any part of the outer peripheral surface of the leading outer pipe or the replenishing outer pipe in which almost the entire outer peripheral surface is exposed is bored. Since it is good to rotate by restraining it with the slider's chuck mechanism, the size of the leading outer pipe and the extension outer pipe is set longer. Even if it reaches only up to that point, the drill bit can be rotated by restraining the middle part of the leading outer pipe or the replenishing outer pipe with the chuck mechanism of the slider of the boring machine and rotating the same. Therefore, the dimensions of the outer pipe for leading and the outer pipe for adding can be set as long as possible, and the dimensions of the inner pipe for leading and the inner pipe for adding can be set long correspondingly. That is, by setting the dimensions of the leading inner and outer pipes and the inner pipe for replenishment to be long respectively, the number of complicated replenishment work when drilling a predetermined depth is reduced, and the labor and time of the drilling work are reduced. Therefore, the work efficiency of the drilling work can be improved.

When the connection between the soil discharge inlet pipe and the air outlet pipe by the rotary transmission portion is released, for example, the leading outer pipe and the replenishing outer pipe are left in the ground, and the leading inner pipe and Since only the inner pipe for addition can be extracted from the outer pipe for lead and the outer pipe for addition, the outer pipe for lead and the outer pipe for addition can be used as they are as pipes for extracting groundwater.

[0023]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a view for explaining an underground drilling device according to an embodiment of the invention, FIG. 1 (A) is a vertical sectional view of the drilling device mounted on a boring machine, and FIG. 1 (B) is a rotational transmission of the underground drilling device. 1C is a cross-sectional view taken along the line CC of FIG. 1B. FIG. 2 is a vertical cross-sectional view of the vicinity of a drill bit of an underground drilling device according to an embodiment of the present invention, and FIG. 3 is a vertical cross-sectional view illustrating a modified example of a rotary transmission unit in the embodiment of the present invention.
4 (A) to 4 (D) are explanatory views of a perforation process by the leading inner and outer tubes for the underground perforation apparatus according to the embodiment of the present invention. Figure 5
(A)-(D) is a drilling | boring process explanatory drawing by the inner and outer pipes for a lead and the inner and outer pipes for replenishment of the underground drilling apparatus which concerns on the Example of this invention.

In FIG. 1 (A), reference numeral 38 indicates a double pipe type underground drilling device with an air hammer, which is as follows. An air hammer 2 is provided inside the leading inner tube 1. A drill bit 3 is attached to the tip of the leading inner tube 1. The drill bit 3, as shown in FIG.
A reamer 18 is provided between the guide device 16 and the pilot bit 17, and the reamer 18 overhangs laterally during rotation to scrape rock on the tip side of the outer pipe 8 for leading. An exhaust outlet (not shown) of the air hammer 2 is opened in the drill bit 3.

As shown in FIG. 1 (A), a base end portion of the leading inner pipe 1 and a base end portion of the replenishing inner pipe 4 that adds to the leading inner pipe 1 are connected to the rotary joint 5 for supplying air. The air outlet pipes 6 can be detachably connected by screw fitting. The air supply passage 7 for supplying air from the air outlet pipe 6 to the air hammer 2 is provided with a leading inner pipe 1 and a replenishing inner pipe 4.
It is provided inside.

The earth inlet pipe 11 of the earth discharging rotary joint 10 is screw-fitted to the base end portion of the outer pipe 8 for leading and the base end portion of the outer pipe 9 for adding to the outer pipe 8 for leading, respectively. The outer diameters of both outer pipes 8 and 9 are the same.
Around the inner pipes 1 and 4 fitted inside the
It has a size that can hold 2.

As shown in FIG. 1 (B), the air supply rotary joint 5 has an air inlet pipe 20 rotatable to the side of the case 19.
And the rotatable air outlet pipe 6 is projected to the lower side of the case 19. The earth discharging rotary joint 10 projects the earth discharging outlet pipe 22 from the lateral side of the case 21, supports the base end side of the earth discharging inlet pipe 11 through the angular bearing 23 in the case 21, 11 can be freely rotated.

As shown in FIG. 1B, the soil discharge inlet pipe 11
The air outlet pipe 6 can be rotatably interlocked with each other via the rotation transmission portion 13. Rotation transmission unit 13
Is composed of a boss 24 fixed to the base end side of the soil discharge inlet pipe 11 and a boss insertion portion 25 integrally formed around the air outlet pipe 6, and as shown in FIG. The hole inner peripheral surface 26 and the outer peripheral surface 27 of the boss insertion portion 25 are formed in a hexagonal column shape, and the boss insertion portion 25 is inserted into the boss 24 in a non-rotating state.

As shown in FIG. 1 (A), when the additional outer tube 9 is constrained by the chuck mechanism of the slider 15 of the boring machine 14 and a rotational force is applied from the chuck mechanism to the additional outer tube 9, the rotational force is increased. Is transmitted to the drill bit 3 through the soil discharge inlet pipe 11, the rotary transmission portion 13, the air outlet pipe 6, the refilling inner pipe 4, and the leading inner pipe 1 in this order to carry out drilling.

Further, in the case of drilling only with the inner and outer tubes 1 and 8 for leading, when the outer tube 8 for leading is constrained by the chuck mechanism of the slider 15 of the boring machine 14 and a rotational force is applied from the chuck mechanism, Rotational force is the earth removal inlet pipe 1
1, the rotary transmission unit 13, the air outlet pipe 6, and the leading inner pipe 1 are sequentially transmitted to the drill bit 3 for drilling.

In the case of FIG. 1 (A), air is supplied from a predetermined compressor 28 to the air hammer 2 through the air supply rotary joint 5 and the air supply passage 7 in this order as indicated by arrows 29 and 30. At the same time, the slider 15 is lowered while rotating the chuck mechanism of the slider 15. An impact force is applied to the drill bit 3 by the operation of the air hammer 2, a propulsive force is applied to the outer pipes 8 and 9 by the lowering of the slider 15, and the outer pipes 8 and 9 are driven by the rotation of the chuck mechanism.
A rotational force is applied to.

The rotational force applied to the extension outer tube 9 is
It is transmitted to the drill bit 3 through the soil discharge inlet pipe 11, the rotary transmission portion 13, the air outlet pipe 6, the refilling inner pipe 4, and the leading inner pipe 1 in this order. Both outer pipes 8 and 9 penetrate into the ground by the propulsive force due to the lowering of the slider 15, and both inner pipes 1 and 4 are grounded by their own weight and the impact force of the air hammer 2 in synchronism with the propulsion of both outer pipes 8 and 9. It will invade inside. The earth and sand scraped by the drill bit 3 is discharged through the discharge passage 12 and the earth discharging rotary joint 10 in order by the exhaust air blown from the exhaust jet port (not shown) of the drill bit 3 as shown by arrows 31 and 32. It will be soiled.

In this underground drilling device 38, the slider 15
Since the leading outer pipe 8 and the replenishment outer pipe 9 are constrained to the chuck mechanism of No. 2 to perform perforation, the earth discharging rotary joint 10 can be always arranged above the slider 15. The arrangement height of the earth removal rotary joint 10 is not limited by the upper limit of the slider 15. Therefore, the leading outer pipe 8 connected to the lower side of the earth removal rotary joint 10
Also, there is no limitation on the dimension setting of the extension outer pipe 9, and these dimensions can be set long, and correspondingly, the dimensions of the leading inner pipe 1 and the extension inner pipe 4 can also be set long.

In the underground punching device 38, punching is performed in the next step. First, as shown in FIG. 4 (A), the inner pipe for leading 1 is fitted into the outer pipe for leading 8, and the rotary joint 10 for earth removal is connected to the base end of the outer pipe for leading 8 and The air supply rotary joint 5 is connected to the base end portion of the inner pipe for use 1 and the middle portion of the outer pipe for lead 8 is restrained by the chuck mechanism of the slider 15, and the slider 15 is attached as shown in FIG. 4B. While lowering, the leading inner and outer pipes 1 and 8 are partially penetrated into the ground.

Next, as shown in FIG. 4 (C), the slider 15 is lifted by releasing the restraint of the chuck mechanism of the slider 15 while the leading inner and outer tubes 1 and 8 are partially penetrated into the ground. Then, the chuck 15 of the slider 15 causes the outer tube 8 for leading.
4D, the leading inner and outer pipes 1 and 8 are made to penetrate into the ground while lowering the slider 15 as shown in FIG. 4D.

Next, as shown in FIG. 5 (A), the earth removal rotary joint 10 and the air supply rotary joint 5 are separated from the leading inner and outer pipes 1 and 8, and these are suspended on the crane 33. As it is, the outer pipe 9 for addition is added to the lower side of the earth removal rotary joint 10.
And connecting the inner pipe 4 for addition to the lower side of the rotary joint 5 for supplying air, and as shown in FIG. 5 (B), while adding the outer pipe 9 for addition to the outer pipe 8 for leading, The leading inner pipe 1 is replenished and the inner pipe 4 is replenished.

Next, as shown in FIG. 5C, the restraint of the chuck mechanism of the slider 15 restraining the base end portion of the outer pipe 8 for leading is lifted, and the slider 15 is raised to move the slider 15 The middle part of the extension outer pipe 9 is restrained by the chuck mechanism of No. 2, and as shown in FIG. 1D, while the slider 15 is lowered, the addition inner pipes 4 and 9 are partially inserted into the ground. , The leading inner / outer tube 1 that had been invaded into the ground first
・ Introduce 8 deeper. After that, Fig. 4 (C)
As in the case of (D), the chuck 15 of the slider 15 is added to restrain the proximal end portion of the outer pipe 9 and the lowering of the slider 15 causes the inner and outer pipes 1 and 8 for supplementation to further penetrate to the proximal end portion. .

The contents of the underground drilling device according to the embodiment of the present invention are as described above, but the present invention is not limited to the above embodiment. For example, in the above embodiment, FIG.
As shown in FIG. 5, the rotary transmission part 13 has a boss insertion part 25 slidably inserted in the axial direction of the boss 24. In the rotary transmission part 13, the boss insertion part 25 is attached to the leading outer pipe 8 and the additional outer pipe 9. The propelling force is not transmitted to the leading inner pipe 1 and the refilling inner pipe 4, but as shown in FIG.
The lock bolt 36 may be attached to the flange 34 at the upper part of the 4 through the stay 35 so that the tip of the lock bolt 36 can be fitted into the bolt fitting hole 37 of the boss insertion portion 25. In this case, the propulsive force applied to the outer guide tube 8 and the outer supplement tube 9 is transmitted to the inner guide tube 1 and the inner supplement tube 4 via the lock bolt 36.

[Brief description of drawings]

1 is a view for explaining an underground drilling device according to an embodiment of the present invention, FIG. 1 (A) is a vertical cross-sectional view of the underground drilling device mounted on a boring machine, and FIG. 1 (B) is a ground drilling device. FIG. 1 (C) is a vertical cross-sectional view of the vicinity of the rotation transmission part of the intermediate boring device, and FIG.
It is a -C line sectional view.

FIG. 2 is a vertical cross-sectional view around a drill bit of an underground drilling device according to an embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view illustrating a modification of the rotary transmission unit in the embodiment of the present invention.

4 (A) to 4 (D) are explanatory views of a perforating process using the leading inner and outer tubes for the underground drilling device according to the embodiment of the present invention.

5 (A) to 5 (D) are explanatory views of a perforation process using a lead inner / outer tube and a replenishment inner / outer tube of the underground boring device according to the embodiment of the present invention.

FIG. 6 is an explanatory view of an underground drilling device according to a conventional technique.

7 (A) to 7 (D) are explanatory views of a perforation process performed by the underground perforation apparatus according to the related art.

[Explanation of symbols]

1 ... Leading inner tube, 2 ... Air hammer, 3 ... Drill bit,
4 ... Inner pipe for replenishment, 5 ... Rotary joint for air supply, 6 ... Air outlet pipe, 7 ... Air supply passage, 8 ... Outer pipe for leading, 9 ... Outer pipe for replenishment, 10 ... Rotating joint for earth removal, 11 ... Ejection inlet pipe, 12 ... Ejection passage, 13 ... Rotation transmission section.

Claims (1)

[Claims] 1. An air hammer (2) is provided inside the leading inner pipe (1), and an exhaust air of the air hammer (2) is attached to a drill bit (3) attached to the tip of the leading inner pipe (1). Open the outlet and connect the additional inner pipe (4) to the base end of the leading inner pipe (1).
The air outlet pipe (6) can be added to the rotary joint (5) for air supply.
The air outlet pipe (6) is rotatably provided and the leading inner pipe (1) is provided.
Alternatively, it can be attached to and detached from the base end of the above-mentioned inner pipe (4) for addition.
Connect it to raise the air discharged from this air outlet pipe (6).
Through the air supply passage (7) formed in the inner pipe (1) (4)
To supply to the above air hammer (2), and add the outer pipe (9) for addition to the base end of the outer pipe (8) for lead.
The outer tube (8) (9) of each of these
The inner diameter is made larger than the outer diameter of the inner tubes (1) and (4),
A state in which an earth discharge passage (12) is provided around the inner pipes (1) (4)
In this state, the outer pipes (8) and (9) are externally fitted to the inner pipes (1) and (4), and the earth removal inlet pipe (11) is axially attached to the earth removal rotary joint (10).
It is rotatably installed, and this soil discharge inlet pipe (11) is used for the outside
Attaching to and detaching from the base end of the pipe (8) or the outer pipe (9) for replenishment
Connect as much as possible, and remove the above-mentioned exhaust from the tip of the above-mentioned leading outer pipe (8).
The earth and sand that has entered the earth passageway (12) is removed from this earth passageway (12).
And through the above-mentioned soil discharge inlet pipe (11) in order
In the constructed double-pipe underground drilling device with air hammer, the soil discharge inlet pipe (11) and the air outlet pipe (6) are rotated.
The moving part (13) enables interlocking connection,
Applied to the outer pipe (8) or the outer pipe (9) for replenishment
Rotation force is applied to the soil discharge inlet pipe (11) and the rotation transmission part (1
3), the inner pipe for leading through the air outlet pipe (6) in order
A double-pipe underground drilling device with an air hammer, characterized in that it can be transmitted to (1) .