JPH04353189A - Double pipe type underground boring device with air hammer - Google Patents

Abstract

PURPOSE:To lengthen setting sizes of internal and external pipes and to reduce a number of complicated extention works by placing an earth moving rotary joint always on an upper side than a slider, and limiting a height of placement of the earth moving rotary joint with the ceiling on the slider. CONSTITUTION:An air outlet pipe 6 of an air supplying rotary joint 5 is connected to the base end of a guiding internal pipe 1 and the base end of an adding internal pipe 4 adding thereto, and an earth moving inlet pipe 11 of an earth moving rotary joint 10 is connected to the base end of a guiding external pipe 8 and the base end of an adding external pipe 9 adding thereto. Both internal pipes 1 and 4 are fitted to the insides of both external pipes 8 and 9, and the air outlet pipe 6 is interlocked and connected with the earth moving inlet pipe 11 through a rotary conduction 13 so that it is capable of rotating and interlocking. The guiding external pipe 8 and the adding external pipe 9 are constrained to a chuck mechanism of a slider 15 in a boring machine 14 to bore a hole.

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 A conventional double pipe type underground drilling device with an air hammer is shown in FIG. 6, which is constructed as follows. An air hammer 10 is placed inside the leading inner tube 101.
2 is installed internally, and an exhaust outlet of the air hammer 102 is provided in a drill bit 103 attached to the tip of the leading inner pipe 101. An air outlet pipe 106 of the air supply rotary joint 105 is connected to the base end of the leading inner pipe 101 and the base end of the supplementary inner pipe 104 to be added to the leading inner pipe 101.
An 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 supplementing inner pipe 104.

The soil discharge inlet pipe 111 of the rotary joint 110 for soil discharge can be attached and detached from the base end of the leading outer pipe 108 and the base end of the supplementary outer pipe 109 which is added to the leading outer pipe 108. I have to. The inner diameters of both the outer tubes 108 and 109 are made large enough to hold the earth removal passage 112 around the inner tubes 101 and 104 that are fitted into the outer tubes 108 and 109, respectively.

[0004] In the double-pipe underground drilling apparatus having such a configuration, drilling is performed in the next step using the boring machine 113. First, as shown in FIG. 7A, the inner and outer guide pipes 101 and 108 are connected to the lower sides of the air supply rotary joint 105 and the soil removal rotary joint 110, respectively.
As shown in (B), while lowering the slider 114 of the boring machine 113, the leading inner and outer tubes 101 and 108 are
penetrate underground.

Next, as shown in FIG. 7(C), while leaving the leading inner and outer pipes 101 and 108 underground, the air supply rotary joint 105 and the soil removal rotary joint 110 are removed.
, connect the inner and outer pipes 104 and 109 for addition to both joints 105 and 110, respectively, and connect the inner and outer pipes 104 and 109 for addition to the inner and outer pipes 101 and 108 for leading, as shown in FIG. 7(D). Add. Then, as in the case of FIG. 7(B), while lowering the slider 114, the leading inner and outer tubes 101 and 108 are penetrated deeper into the ground. Then, in the same manner, the inner and outer pipes 10 for addition are added one after another.
4.109 is added and the hole is drilled to a predetermined depth.

[0006] In the double pipe underground drilling apparatus having the above configuration, when drilling is performed, air is supplied from a predetermined compressor 115 as indicated by arrows 116 and 117 to the air supply rotary joint 105, as shown in FIG. The drill bit 103 is rotated while supplying the air to the hammer 102 via the air supply passage 107 in order, and propels the leading inner and outer pipes 101 and 108 and the supplementary inner and outer pipes 104 and 109 into the ground. The earth and sand removed by arrows 118 and 119
As shown in the figure, the exhaust gas blown out from the exhaust outlet of the drill bit 103 discharges the soil through the soil discharge passage 112 and the soil discharge rotary joint 110 in this order.

By the way, in this prior art, the proximal end of the leading inner pipe 101 and the proximal end of the replenishing inner pipe 104 are made to be rotatably inserted into the soil removal rotary joint 110, and as shown in FIG. ), the earth removal rotary joint 110
The proximal end of the leading inner tube 101 that protrudes upward is restrained by a rotatable chuck mechanism installed in the slider 114 of the boring machine 113, and the rotation of the chuck mechanism is controlled by the drill through the leading inner tube 101. bit 103.

In the case of FIG. 7(D), the proximal end of the replenishment inner pipe 104 protruding above the soil removal rotary joint 110 is restrained by a chuck mechanism provided inside the slider 114, and the chuck The rotation of the mechanism is transmitted to the drill bit 103 via the supplementary inner pipe 104 and the leading inner pipe 101 in this order.

In this case, a propulsive force is directly applied to the leading inner tube 101 and the supplementing inner tube 104 by the lowering of the slider 114. On the other hand, as shown in FIG. 6, the propulsive force is transmitted from the leading inner tube 101 to the leading outer tube 108 and the supplementary outer tube 109 via the propulsive force transmitting section 120. This propulsive force transmission section 120 consists of an upward step section 121 provided inside the tip of the leading outer tube 108 and a downward step section 122 provided around the drill bit 103. A downward stepped portion 122 is brought into contact with it.

0010

[Problems to be Solved by the Invention] In the above-mentioned prior art, the proximal end of the leading inner pipe 101 and the proximal end of the replenishing inner pipe 104 are made rotatably inserted into the earth removal rotary joint 110, In the case of FIG. 7A, the proximal end of the leading inner pipe 101 that protrudes above the earth removal rotary joint 110 is restrained by a rotatable chuck mechanism installed in the slider 114 of the boring machine 113. Also, Figure 7 (D
), the proximal end of the replenishment inner pipe 104 protruding above the soil removal rotary joint 110 is restrained by a chuck mechanism installed inside the slider 114.
The soil removal rotary joint 110 will always be located below the slider 114.

Since there is a limit to the height of the slider 114, there is also a limit to the height at which the soil removal rotary joint 110 located below the slider 114 can be arranged. Therefore, as shown in FIG. 7(A), the set dimensions of the leading outer pipe 108 are the distance 124 from the lower end of the earth removal inlet pipe 111 of the earth removal rotary joint 110 at the upper limit height position to the ground surface 123. Shortly limited within range. In addition, Fig. 7 (D
), the set dimensions of the outer pipe 1109 for refilling are the same as the soil discharge inlet pipe 1 of the rotary joint 110 for soil discharge at the upper limit height position.
The distance is limited to a distance 125 from the lower end of the pipe 11 to the upper end of the leading outer pipe 108 underground. Along with this, the set dimensions of the leading inner tube 101 and the supplementing inner tube 104 are also the same as the leading outer tube 108 and the supplementing outer tube 109.
limited to a short length corresponding to the set dimensions.

As described above, in the above-mentioned conventional technology, the leading inner and outer tubes 101 and 108 and the supplementary inner and outer tubes 104 and 10
Since the set dimension of No. 9 is limited to a short size, when drilling a hole to a predetermined depth, there is a large number of complicated replenishing operations, and the efficiency of the drilling operation is low.

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

[0014]

Means for Solving the Problems The present invention is premised on the following configuration, as illustrated in FIG. 1(A). Leading inner tube 1
An air hammer 2 is installed inside the inner pipe 1, and the air hammer 2 is attached to a drill bit 3 attached to the tip of the leading inner pipe 1.
The exhaust outlet is opened. The air outlet pipe 6 of the air supply rotary joint 5 can be detachably connected to the base end of the leading inner pipe 1 and the base end of the supplementary inner pipe 4 to be added to the leading inner pipe 1. I have to. An air supply passage 7 for supplying air from the air outlet pipe 6 to the air hammer 2 is provided in the leading inner pipe 1 and the supplementing inner pipe 4.

Further, the soil discharge inlet pipe 11 of the rotary joint 10 for soil discharge is attached and detached from the base end of the leading outer pipe 8 and the base end of the supplementary outer pipe 9 to be added to the leading outer pipe 8. I'm trying to make it possible. The inner diameters of the outer tubes 8 and 9 are set to be large enough to hold the earth removal passage 12 around the inner tubes 1 and 4 which are fitted into the outer tubes 8 and 9, respectively.

The present invention is based on the above configuration, and is based on FIG.
) and (C), the air outlet pipe 6 is configured to be rotatably connected to the soil discharge inlet pipe 11 via the rotational transmission part 13.

[0017]

[Operation] As shown in FIGS. 1(B) and 1(C), the air outlet pipe 6 is configured to be rotatably connected to the soil discharge inlet pipe 11 via the rotation interlocking part 13. (A)
As shown in the figure, when the outer pipe 9 for replenishment is restrained by the chuck mechanism of the slider 15 of the boring machine 14 and a rotational force is applied to the outer pipe 9 for replenishment from the chuck mechanism, the rotational force is applied to the outer replenishment pipe 9. , the rotational transmission part 13, the air outlet pipe 6, the replenishing inner pipe 4, and the leading inner pipe 1 in order to be transmitted to the drill bit 3, and drilling is performed.

In addition, when drilling is performed using only the leading inner and outer tubes 1 and 8, the leading outer tube 8 is restrained by the chuck mechanism of the slider 15 of the boring machine 14, and rotational force is applied from the chuck mechanism. The rotational force is generated by the soil discharge inlet pipe 11.
, the rotation transmission part 13, the air outlet pipe 6, and the inner guide pipe 1 in order to be transmitted to the drill bit 3, and drilling is performed.

In this way, since drilling can be performed while the leading outer pipe 8 and the supplementary outer pipe 9 are restrained by the chuck mechanism of the slider 15, the earth removal rotary joint 10 is always placed above the slider 15. Therefore, the height of the soil removal rotary joint 10 is not limited by the upper limit of the slider 15. For this reason, the soil removal rotary joint 1
Leading outer pipe 8 and supplementary outer pipe 9 connected to the lower side of 0
There are no restrictions on setting the dimensions of the pipe, and these dimensions can be set longer. Correspondingly, the dimensions of the leading inner pipe 1 and the supplementary inner pipe 4 can also be set longer, making it easier to drill holes to a predetermined depth. The number of refills required is reduced, increasing the efficiency of drilling work.

[0020]

[Effects of the Invention] Since the air outlet pipe is configured to be rotatably connected to the soil discharge inlet pipe through the rotation interlocking part, the replenishment outer pipe can be restrained by the chuck mechanism of the slider of the boring machine, and the air outlet pipe can be chucked. When the mechanism applies rotational force to the outer replenishment pipe, the rotational force is applied to the soil discharge inlet pipe,
The air is transmitted to the drill bit in order through the rotational transmission part, the air outlet pipe, the supplementary inner pipe, and the leading inner pipe, and drilling is performed.

[0021] In addition, when drilling is performed using only the leading inner and outer pipes, the leading outer pipe is restrained by the chuck mechanism of the slider of the boring machine and rotational force is applied from the chuck mechanism. The air is transmitted to the drill bit through the inlet pipe, rotational transmission part, air outlet pipe, and guiding inner pipe in order, and drilling is performed.

[0022] In this way, since drilling can be performed by restraining the leading outer pipe and the supplementing outer pipe with the chuck mechanism of the slider, it is possible to always arrange the soil removal rotary joint above the slider. The height of the rotary joint for soil removal is not limited by the upper limit of the slider. Therefore, there are no restrictions on the dimensions of the leading outer pipe and supplementary outer pipe that are connected to the lower side of the soil removal rotary joint, and these dimensions can be set longer. The size of the inner pipe for refilling can be set to be long, and when drilling a hole to a predetermined depth, the number of times of complicated refilling work is reduced, and the work efficiency of the drilling work is increased.

[0023]

[Embodiment] An embodiment of the present invention will be explained based on the drawings. FIG. 1 is a diagram illustrating an underground drilling device according to an embodiment of the invention, FIG. 1(A) is a longitudinal cross-sectional view of the drilling device attached to a boring machine, and FIG. 1(B) is a rotational transmission of the underground drilling device. FIG. 1(C) is a longitudinal sectional view of the vicinity of the section, and FIG. 1(C) is a sectional view taken along the line CC in FIG. 1(B). FIG. 2 is a vertical cross-sectional view of the vicinity of the drill bit of the underground drilling apparatus according to the embodiment of the present invention, and FIG. 3 is a vertical cross-sectional view illustrating a modification of the rotational transmission part in the embodiment of the present invention. FIGS. 4(A) to 4(D) are explanatory views of the drilling process using the inner and outer guide tubes of the underground drilling apparatus according to the embodiment of the present invention. Figure 5 (
A) to (D) are explanatory views of the drilling process using the leading inner and outer pipes and the supplementary inner and outer pipes of the underground drilling device according to the embodiment of the present invention.

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

As shown in FIG. 1(A), an air supply rotary joint 5 is installed at the base end of the leading inner pipe 1 and the base end of the supplementary inner pipe 4 to be added to the leading inner pipe 1. The air outlet pipes 6 can be detachably connected by screw fitting. The air supply passage 7 that supplies air from the air outlet pipe 6 to the air hammer 2 is connected to the leading inner pipe 1 and the supplementary inner pipe 4.
It is located inside.

The soil discharge inlet pipe 11 of the rotary joint 10 for soil discharge is screwed into the base end of the leading outer tube 8 and the base end of the supplementary outer tube 9 to be added to this leading outer tube 8. The inner diameter of both outer tubes 8 and 9 is
An earth removal passage 1 is installed around both inner pipes 1 and 4 that are fitted inside the pipes.
It is sized to hold 2.

As shown in FIG. 1(B), the air supply rotary joint 5 includes a rotatable air inlet pipe 20 on the side of the case 19.
and a freely rotatable air outlet pipe 6 protrudes from the lower side of the case 19. The soil discharge rotary joint 10 has a soil discharge outlet pipe 22 protruding from the side of a case 21, and a base end of the soil discharge inlet pipe 11 is supported inside the case 21 via an angular bearing 23. 11 can be rotated freely.

As shown in FIG. 1(B), the soil discharge inlet pipe 11
The air outlet pipe 6 can be connected to the air outlet pipe 6 through the rotation transmission part 13 so as to be rotationally interlocked. The rotation transmission part 13 consists of a boss 24 fixed to the base end side of the soil discharge inlet pipe 11 and a boss insertion part 25 integrally formed around the air outlet pipe 6, as shown in FIG. 1(C). The boss hole inner circumferential surface 26 of the boss 24 and the outer circumferential surface 27 of the boss insertion part 25 are formed in a hexagonal column shape, and the boss insertion part 25 is inserted into the boss 24 in a rotationally prevented state.

As shown in FIG. 1(A), when the replenishment outer tube 9 is restrained 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 replenishment outer tube 9, the rotational force is is transmitted to the drill bit 3 through the soil discharge inlet pipe 11, the rotational transmission part 13, the air outlet pipe 6, the replenishing inner pipe 4, and the leading inner pipe 1 in this order, and drilling is performed.

When drilling is performed using only the leading inner and outer tubes 1 and 8, the leading outer tube 8 is restrained by the chuck mechanism of the slider 15 of the boring machine 14, and rotational force is applied from the chuck mechanism. The rotational force is generated by the soil discharge outlet pipe 11.
, the rotation transmission part 13, the air outlet pipe 6, and the inner guide pipe 1 in order to be transmitted to the drill bit 3, and drilling is performed.

0
In the case of FIG. 1(A), the predetermined compressor 2
8, air is supplied to the air hammer 2 through the air supply rotary joint 5 and the air supply passage 7 in this order as shown by arrows 29 and 30, and at the same time the slider 15 is lowered while rotationally driving the chuck mechanism of the slider 15. let The operation of the air hammer 2 applies an impact force to the drill bit 3, the lowering of the slider 15 applies a propulsive force to both outer tubes 8 and 9, and the rotational drive of the chuck mechanism applies rotational force to both outer tubes 8 and 9. be done.

[0032] The rotational force applied to the outer pipe 9 for addition is as follows:
It is transmitted to the drill bit 3 via the soil discharge inlet pipe 11, the rotation transmission part 13, the air outlet pipe 6, the replenishing inner pipe 4, and the leading inner pipe 1 in this order. The outer tubes 8 and 9 penetrate into the ground due to the propulsive force generated by the downward movement of the slider 15, and the inner tubes 1 and 4 are pushed into the ground by their own weight and the impact force of the air hammer 2 almost simultaneously with the propulsion of the outer tubes 8 and 9. It will invade inside. The earth and sand scraped by the drill bit 3 is discharged through the earth removal passage 12 and the earth removal rotary joint 10 in this order by the exhaust air blown out from the exhaust outlet (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 supplementary outer pipe 9 are restrained in the chuck mechanism so that drilling can be performed, the rotary joint 10 for soil removal can always be placed above the slider 15, The arrangement height of the soil removal rotary joint 10 is not limited by the upper limit of the slider 15. Therefore, there are no restrictions on the dimensions of the leading outer pipe 8 and the supplementing outer pipe 9 that are connected to the lower side of the soil removal rotary joint 10, and these dimensions can be set longer. The dimensions of the inner tube 1 and the additional inner tube 4 can also be set long.

[0034] In this underground drilling device 38, drilling is performed in the next step. First, as shown in FIG. 4(A), the inner pipe 1 for leading is fitted into the outer pipe 8 for leading, and the rotary joint 10 for soil removal is connected to the base end of the outer pipe 8 for leading. The air supply rotary joint 5 is connected to the base end of the inner pipe 1, and the middle part of the outer pipe 8 is restrained by the chuck mechanism of the slider 15, and the slider 15 is moved as shown in FIG. 4(B). While descending, the guide inner and outer pipes 1 and 8 are penetrated halfway 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 leaving the guide inner and outer tubes 1 and 8 halfway underground. the leading outer tube 8 using the chuck mechanism of the slider 15.
As shown in FIG. 4(D), while lowering the slider 15, the guide inner and outer tubes 1 and 8 are penetrated into the ground up to their base ends.

Next, as shown in FIG. 5(A), the soil 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. The outer pipe 9 for addition is attached to the bottom of the rotary joint 10 for soil removal.
At the same time, connect the additional inner pipe 4 to the lower side of the air supply rotary joint 5, and as shown in FIG. 5(B), add the additional outer pipe 9 to the leading outer pipe 8, An additional inner pipe 4 is added to the leading inner pipe 1.

Next, as shown in FIG. 5C, the restraint of the chuck mechanism of the slider 15 that restrains the proximal end of the leading outer tube 8 is released, the slider 15 is raised, and the slider 15 is raised. The middle part of the outer pipe 9 for replenishment is restrained by the chuck mechanism, and then, as shown in FIG. , Leading inner and outer pipes 1 that were previously penetrated into the ground
・Let 8 penetrate deeper. After that, Figure 4(C)・(
As in the case of D), the chuck mechanism of the slider 15 restrains the proximal end of the outer replenishing tube 9, and as the slider 15 descends, the inner and outer replenishing tubes 1 and 8 penetrate deeper into the proximal end.

The contents of the underground drilling apparatus 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 the figure, the rotation transmission part 13 has a boss insertion part 25 that is slidably inserted in the axial direction of the boss 24. The structure is such that the propulsive force is not transmitted to the leading inner pipe 1 and the supplementary inner pipe 4, but as shown in Fig. 3, the boss 2
A lock bolt 36 may be attached to the flange 34 on the upper part of 4 through a stay 35 so that the tip of the lock bolt 36 can be inserted into the bolt insertion hole 37 of the boss insertion part 25. In this case, the propulsive force applied to the leading outer tube 8 and the supplementing outer tube 9 is transmitted to the leading inner tube 1 and the supplementing inner tube 4 via the lock bolt 36.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating an underground drilling device according to an embodiment of the invention, FIG. 1(A) is a vertical cross-sectional view of the underground drilling device attached to a boring machine, and FIG. A vertical cross-sectional view of the vicinity of the rotation transmission part of the medium drilling device, Fig. 1(C) is C in Fig. 1(B)
-C line sectional view.

[Fig. 2] Fig. 2 is a vertical cross-sectional view of the vicinity of the drill bit of the underground drilling device according to the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view illustrating a modification of the rotational transmission section in the embodiment of the present invention.

FIGS. 4(A) to 4(D) are explanatory diagrams of the drilling process using the leading inner and outer pipes of the underground drilling apparatus according to the embodiment of the present invention.

FIGS. 5(A) to 5(D) are explanatory diagrams of the drilling process using the leading inner and outer pipes and the supplementary inner and outer pipes of the underground drilling apparatus according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram of an underground drilling device according to the prior art.

FIG. 7A to FIG. 7D are explanatory diagrams of a drilling process using an underground drilling device according to the prior art.

[Explanation of symbols]

1... Inner pipe for leading, 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... Rotary joint for soil removal, 11 ...Earth removal inlet pipe, 12...Earth removal passage, 13...Rotation transmission section.

Claims (1)

[Claims] [Claim 1] An air hammer (2) is installed inside the leading inner tube (1).
), and an exhaust outlet of the air hammer (2) is drilled in the drill bit (3) attached to the tip of the leading inner pipe (1), and the proximal end of the leading inner pipe (1) and The air outlet pipe (6) of the air supply rotary joint (5) is attached to the proximal end of the additional inner pipe (4) to be added to this leading inner pipe (1).
) can be detachably connected to each other, and an air supply passage (7) that supplies air from this air outlet pipe (6) to the air hammer (2) is connected to the leading inner pipe (1) and the supplementary inner pipe ( 4) provided inside the proximal end of the leading outer tube (8) and a supplementary outer tube (
The soil discharge inlet pipe (11) of the soil discharge rotary joint (10) can be attached to and detached from the base end of the soil discharge rotary joint (10), and both of the outer tubes (
The inner diameters of 8) and (9) are large enough to hold the earth removal passageway (12) around the inner pipes (1) and (4) that are fitted into the outer pipes (8) and (9), respectively. In the double-pipe underground drilling equipment with an air hammer, the above-mentioned soil discharge inlet pipe (1
1) through the rotation transmission part (13) to the air outlet pipe (6).
1.) A double pipe type underground drilling device with an air hammer, characterized in that it is configured such that the two parts ( ) can be connected in a rotationally interlocking manner.