JP2001123782A - Slurry type air hammer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems in a conventional air hammer, such as a deteriorated working environment, degraded workability, etc., which are caused by dust scattering due to generation of air blow on the ground. SOLUTION: There is provided an air hammer which is insertably provided in a cylindrical propelling pipe 11. In the air hammer, a expandable bit 6 having a claw 8 which is expandable and rotatable, is arranged at the front end of a cylinder 12 internally installed in the propelling pipe 11, and a hammer 16 which advances and retreats by high pressure air A to drive the expandable bit 6, is arranged at the rear of the expandable bit 6. Further, a venting pipe 21 for spouting high pressure water W to earth is arranged at the center of the cylinder 12, and slurry D is passed through a discharge passage 29 between the propelling pipe 11 and the cylinder 12, and mixed in a mixing chamber 30, and discharged via an exhaust pipe 22 onto the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muddy water hammer used for boring such as earth and sand excavation in order to connect a branch pipe to a water main pipe or a sewer main pipe buried underground. is there.

[0002]

2. Description of the Related Art Conventionally, a valveless air hammer is often used for excavating earth and sand (including rock) when connecting a branch pipe to a main pipe of a water supply or sewer buried underground. This air hammer switches the air by moving the piston forward and backward, excavates by giving vibration to the bit,
The excavated soil was discharged together with the exhaust from the tip of the center of the bit, and was discharged to the ground through the outer periphery of the cylinder.

[0003] Therefore, on the ground, dust on excavated soil is scattered or groundwater spouts due to air blow by exhaust air, which causes a deterioration of the working environment.

In this prior art, for example, when connecting a branch pipe to an underground sewer main pipe, it is necessary to take out an air hammer after completion of excavation work and then push in the branch pipe. There are various problems that need to be improved, such as intrusion of earth and sand into the pipe and poor workability due to the need for many operations.

[0005]

The problem to be solved is that the conventional air hammer has a problem that the air blow occurs on the ground, dust is scattered, the working environment is deteriorated, and the workability is poor. That is.

[0006]

A description will be given with reference to FIGS. 1 to 6. The first invention is an air hammer provided in a cylindrical propulsion tube 11 so as to be freely inserted and detached, and an expansion / contraction bit in which a claw 8 expands / contracts and rotates at a tip end of a cylinder 12 provided in the propulsion tube 11. 6 and a hammer 16 for moving back and forth with the high-pressure air A and striking the expansion / contraction bit 6 at the rear thereof. The mixture is mixed in a mixing chamber 30 through a drainage passage 29 between the pipe 11 and the cylinder 12 and discharged to the ground by a discharge pipe 22.

A second aspect of the present invention is an air hammer provided in a cylindrical propulsion tube 11 so as to be freely inserted into and removed from the cylindrical propulsion tube 11, wherein a substantially cylindrical cylinder 12 forming an outer peripheral portion and a fixed sleeve 13 are provided in the cylinder 12. The high-pressure air supplied to the retreating operation chamber 15 formed at the front end is advanced by the pressure of the high-pressure air A supplied to the forward operation chamber 14 formed at the rear end, and is provided so as to be able to move forward and backward. A hammer 16 which retreats by the pressure of A and repeats the forward movement and the backward movement alternately, and is attached to the front end of the cylinder 12 and has a plurality of claws 8 at the outer peripheral end. It has an expansion / contraction bit 6 for crushing the earth and sand with its impact force, and an expansion / contraction bit 6 from the rear of the cylinder 12 through the center of the cylinder 12 and has a check valve 19 at the tip. A water pipe 20 for jetting water, a ventilation pipe 21 provided along the water pipe 20 behind the cylinder 12 to supply the high-pressure air A to the forward working chamber 14 and the backward working chamber 15, and a water pipe 20 behind the cylinder 12; And a discharge pipe 22 for discharging muddy water D, which is a mixture of the water discharged from the water pipe 20 and the excavated soil, and the claw 8 of the expansion / contraction bit 6 is axially fixed at the base shaft portion 8b. In the forward rotation, the claw tip 8a is projected from the outer peripheral end of the bit body 7 to crush the earth and sand. In the reverse rotation, the earth hammer 10 passes through the inner diameter of the propulsion pipe 11 by being settled in the outer peripheral end of the bit body 7. It is configured to be able to be taken out, and between the ventilation pipe 21 and the forward working chamber 14 and the backward working chamber 15,
A first check valve 23 is provided, and at least an annular passage 25 formed between the cylinder 12 and the fixed sleeve 13, a through hole 26 formed in the fixed sleeve 13, and formed between the fixed sleeve 13 and the hammer 16. An air passage 28 formed by an annular groove 27 is formed, a drainage passage 29 formed between the propulsion pipe 11 and the cylinder 12 between the external muddy water D and the discharge pipe 22, and the forward working chamber 14 or the retreat A mixing chamber 30 that mixes with the air discharged from the working chamber 15 is formed. Further, between the mixing chamber 30 and the forward working chamber 14 or the backward working chamber 15, a second reverse valve interlocked with the first check valve 23 is formed. The stop valve 24 is provided.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described. The muddy water hammer 10 is provided in a cylindrical propulsion pipe 11 so as to be freely inserted and removed. The propulsion pipe 11 can be, for example, a branch pipe for buried water supply or sewerage.

A muddy water hammer 1 according to the present embodiment.
The zero cylinder 12 has a substantially cylindrical shape that constitutes the outer peripheral portion of the air hammer 10. The hammer 16 is also substantially cylindrical, and is provided in the cylinder 12 via a fixed sleeve 13 also having a cylindrical shape so as to be movable forward and backward. Then, it advances by the pressure of the high-pressure air A supplied to the forward operation chamber 14 formed at the rear end, and retreats by the pressure of the high-pressure air A supplied to the backward operation chamber 15 formed at the front end. The forward movement and the backward movement are alternately repeated.

The expansion / contraction bit 6 is attached to the front end of the cylinder 12 and has four pawls 8 on the outer peripheral end. The expansion bit 6 is hit by the forward movement of a hammer 16 located at the rear, and crushes the earth and sand by its impact force. I do. Each claw 8 is rotatably fixed to the bit body 7 at its base shaft portion 8b, and the tip 8a of the claw 8 protrudes from the outer peripheral end of the bit body 7 when the clockwise rotation is forward and right, and the bit is rotated when the rotation is reversed. The main body 7 is set so as not to protrude from the outer peripheral end.

The water pipe 20 extends from the rear of the cylinder 12 to the expansion / contraction bit 6 through the center thereof, the opening at the tip is closed, and a plurality of small holes formed at the tip as shown in FIG. 19a and a rubber tube 19 covering its tip
b.

A ventilation pipe 21 is provided around the water pipe 20 behind the cylinder 12, and sends the high-pressure air A supplied from the air compressor 40 to the forward working chamber 14 and the backward working chamber 15. Vent pipe 21 and forward working chamber 14
The first check valve 2 is provided between the first check valve 2 and the reverse operation chamber 15 in order to alternately move the hammer 16 forward and backward.
3 are provided. Further, an annular passage 25 formed between the cylinder 12 and the fixed sleeve 13,
Through hole 26, fixing sleeve 13 and hammer 16
The air passage 28 is formed by an annular groove 27 formed between the cylinder 12 and the rear passage 31 formed at the rear end of the cylinder 12.
Is formed.

The discharge pipe 22 is provided between the water pipe 20 and the ventilation pipe 21 at the rear of the cylinder 12 and discharges mud D which is a mixture of water discharged from the water pipe 20 and excavated soil. A drainage channel 29 formed between the propulsion pipe 11 and the cylinder 12 is provided between the external muddy water D and the discharge pipe 22,
And a mixing chamber 30 that mixes with the air discharged from the forward working chamber 14 or the backward working chamber 15. Further, the forward working chamber 14 or the backward working chamber 15 and the mixing chamber 3
A second check valve 24 is provided between the first check valve 23 and the first check valve 23. The first check valve 23 and the second check valve 24 are connected by a connection shaft, and a coil spring 32 is fitted on the connection shaft. The forward working chamber 14
The retreat operating chamber 15 and the mixing chamber 30 communicate with each other through an exhaust passage 33 formed along the water pipe 20.

A muddy water hammer 1 according to the present embodiment.
The operation of 0 will be described. First, the principle of movement of the hammer 16 will be briefly described with reference to the operation principle diagrams of FIGS. FIG. 7 shows that the hammer 16 is
Shows the state immediately after hitting the rear end face. In this state, the forward working chamber 14 communicates with the discharge pipe 22. From this state,
The high-pressure air A is sent to the retraction chamber 15 and the hammer 16
Retreats. When the hammer 16 is retracted, the forward working chamber 14 is cut off from the discharge pipe 22 (FIG. 8).

As a result, the air pressure in the forward working chamber 14 increases, the supply of the high-pressure air A to the backward working chamber 15 is cut off, and the hammer 16 is further moved backward by inertial force. Subsequently, the retreat operating chamber 15 communicates with the exhaust pipe 22, the hammer 16 retreats further by inertia, the pressure of the retreat operating chamber 15 decreases, and the high-pressure air A is supplied to the forward operating chamber 14. As a result, the retreat of the hammer 16 is stopped, and the impact of the rear end face of the hammer 16 on the front surface of the cylinder 12 is prevented (FIG. 9).

When the high-pressure air A is supplied to the forward operation chamber 14, the hammer 16 starts to move forward, and the forward movement of the hammer 16 causes the backward operation chamber 15 and the exhaust pipe 22 to move forward.
Is stopped, the supply of the high-pressure air A to the forward working chamber 14 is cut off, and the hammer 16 moves forward by inertial force. The hammer 16 strikes the expansion / contraction bit 6 again, and the forward working chamber 14 communicates with the exhaust pipe 22 and the backward working chamber 15
Is supplied with high-pressure air A (FIG. 7).

Next, FIG. 1 to FIG.
This will be described with reference to FIG. The muddy water hammer 10 is installed at a predetermined position in a state of being inserted through the propulsion pipe 11,
, A high-pressure water A is supplied to the water pipe 20, and the driving device 36 grips and rotates the propulsion pipe 11, and applies a pressing force to the hydraulic cylinder 38. The air hammer 10 and the expansion / contraction bit 6 receive rotation and pressing force through the rod casing 37.

The high-pressure air A supplied to the ventilation pipe 21 is:
The first check valve 23 is pushed open against the resilience of the coil spring 32, passes through the rear passage 31, the air passage 28 formed by the through hole 26 and the annular groove 27, enters the retreating working chamber 15, Press the front end face of No.16.
As a result, the hammer 16 retreats. Hammer 16
As a result, the air existing in the forward working chamber 14 passes through the exhaust path 33, the second check valve 24, and the mixing chamber 30, and is discharged to the discharge pipe 22. The second check valve 24 is in an open state since it is interlocked with the first check valve 23, and thus is smoothly exhausted.

Subsequently, the high-pressure air A supplied from the ventilation pipe 21 passes through the air passage 28 and is sent to the forward working chamber 14. This air pressure causes the hammer 16 to move forward and strike the rear end face of the expansion bit 6. The expansion / contraction bit 6 crushes the earth and sand by the impact force. Since the hammer 16 hits the expansion bit 6 underground,
The impact sound and vibration are weak on the ground. Therefore, the working environment does not deteriorate.

On the other hand, the high-pressure water W supplied to the ventilation pipe 21
Is blown out from a plurality of small holes 19a drilled at the distal end thereof, expands and opens the rubber tube 19b serving as the check valve 19, and blows out from the distal end of the expansion / contraction bit 6. The spouted water wets the soil and forms mud walls. This mud wall reduces the frictional resistance between the propulsion pipe 11 and the earth and sand.
Can be accurately reached to the destination. Further, since the frictional resistance is small, it is possible to push a long distance while saving labor of the driving unit. When the supply of the high-pressure water W is stopped, the rubber tube 19b returns to its original shape and closes the small hole 19a, so that muddy water D or the like does not enter the water pipe 20.

Since the enlargement / reduction bit 6 is rotating forward, its claw 8 protrudes from the outer peripheral end of the bit body 7 to crush the earth and sand. The expansion / contraction bit 6, together with the cylinder 12 and the like to which it is integrally attached, is driven via a driving pipe 35 located on the outer periphery of the ventilation pipe 21 via a driving device 36 installed on the ground.
Rotate by. The earth and sand generated by the excavation mix with the water spouting from the ventilation pipe 21 to form muddy water D, which is sucked into the drainage channel 29 formed between the propulsion pipe 11 and the communication passage 3.
The mixture reaches the mixing chamber 30 via Oa.

Since the air discharged from the forward working chamber 14 or the backward working chamber 15 always passes through the mixing chamber 30, a negative pressure acts on the drain passage 29 to suck the muddy water D. In the mixing chamber 30, the discharged air and the muddy water D
Are mixed and discharged from the discharge pipe 22. Since the discharged earth and sand is mixed with water to form muddy water D, it is not scattered around by air blow after discharging,
It does not deteriorate the working environment. The high-pressure air A
Is not supplied to the ventilation pipe 21, the second check valve 2 interlocked with the first check valve 23
4 is also in the closed state, so that the muddy water D does not flow into the forward working chamber 14 or the like.

When the boring operation is completed, the supply of the high-pressure water W and the high-pressure air A is stopped, and the expansion / contraction bit 6 is rotated in the reverse direction. As a result, the claw 8 rotates about the base shaft portion 8b, and the blade tip 8a is housed inside the outer peripheral end of the bit body 7. By pulling out only the muddy water hammer 10 in this state, the propulsion pipe 11 can be left as it is buried in the soil. Therefore, after the boring is completed, it is not necessary to bury the pipe again. Further, since the muddy water hammer 10 is built in the propulsion pipe 11, no soil remains. Therefore, the propulsion pipe 11 can be used as a branch pipe or the like without performing a troublesome operation such as removing residual soil in the propulsion pipe 11.

In the present embodiment, the propulsion pipe 11
Is adjusted by the telescopic rod 34 so as to face the fume tube (shield) P to be connected. Also,
The discharged muddy water D is treated in a muddy water treatment plant 39, and the separated water is circulated for use. The muddy water hammer 10 is connected to a rod casing 37, and the water pipe 20, the ventilation pipe 21, the discharge pipe 22, and the like pass through the rod casing 37 and communicate with the outside. The air compressor 40 that supplies the high-pressure air A to the ventilation pipe 21 is provided with a silencer 41 to prevent noise and maintain a good working environment.

[0025]

According to the present invention, since the crushed earth and sand is mixed with water and discharged together with the air as muddy water D, the earth and sand are not scattered around by the air blow on the ground. Therefore, the working environment can be improved.

Since the hammer 16 hits the expansion bit 6 normally in the ground, the hitting sound and vibration are weak on the ground. Therefore, it is possible to prevent the working environment from deteriorating due to noise and vibration.

Since water is ejected from the tip of the expansion / contraction bit 6, the water forms a mud wall, and the mud wall can reduce the frictional resistance between the propulsion pipe 11 and the earth and sand. Therefore, the propulsion pipe 11 can be accurately reached to a long-distance destination while saving labor of the driving unit, and workability is greatly improved.

When the boring operation is completed, the claw tip 8a of the expansion / contraction bit 6 can be accommodated inward from the outer peripheral end of the bit body 7, so that the muddy water hammer with the propulsion pipe 11 buried in the ground as it is. Only 10 can be pulled out. Therefore, after the boring is completed, it is not necessary to bury the pipe again. Further, since the muddy water hammer 10 is built in the propulsion pipe 11, no earth and sand remains, and there is no need to perform troublesome additional operations such as a residual soil removing operation.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a usage example of a muddy water hammer according to an embodiment of the present invention.

FIG. 2 shows one embodiment of the present invention, and is a cross-sectional view cut at an arbitrary angle with respect to an axial center line.

FIG. 3 is a view taken along line AA in FIG. 2;

FIG. 4 is a sectional view taken along line BB in FIG. 2;

FIG. 5 is a sectional view taken along line CC in FIG. 2;

FIG. 6 is a partially enlarged view showing a distal end of a water pipe in FIG. 2;

FIG. 7 is an operation principle diagram showing a state in which the hammer moves forward and strikes the rear end face of the expansion / contraction bit.

FIG. 8 is an operation principle diagram showing a state in which a hammer is located at an intermediate point.

FIG. 9 is an operation principle diagram showing a state in which the hammer is retracted.

[Explanation of symbols]

 6 Enlargement / reduction bit 7 Bit body 8 Claw 8a Claw tip 8b Base shaft 10 Muddy water hammer 11 Propulsion pipe 12 Cylinder 13 Fixed sleeve 14 Forward working chamber 15 Retreat working chamber 16 Hammer 19 Check valve 19a Small hole 19b Rubber tube 20 through Water pipe 21 ventilation pipe 22 discharge pipe 23 first check valve 24 second check valve 25 annular passage 26 through hole 27 annular groove 28 air passage 29 drain passage 30 mixing chamber 30a communication passage 31 rear passage 32 coil spring 33 exhaust passage 34 Telescopic rod 35 Drive pipe 36 Drive device 37 Rod casing 38 Hydraulic cylinder 39 Mud treatment plant 40 Air compressor 41 Silencer P Fume pipe A High pressure air W High pressure water D Mud water P Fume pipe (shield)

Claims (2)

[Claims] 1. A muddy water hammer that is inserted into and removed from a cylindrical propulsion pipe (11), wherein the cylinder (12) is provided inside the propulsion pipe (11).
Expansion and contraction bit (6) with a claw (8) at the tip of
A hammer (16) is provided at the rear of the cylinder (12) for moving back and forth with a high-pressure air (A) to strike the expansion / contraction bit (6), and a vent pipe for ejecting high-pressure water (W) to the earth and sand at the center of the cylinder (12). (21) and muddy water (D)
A muddy water hammer that is mixed in a mixing chamber (30) through a drain passage (29) between 1) and a cylinder (12) and discharged to the ground through a discharge pipe (22). 2. A muddy water-type hammer provided in a cylindrical propulsion pipe (11) so as to be able to be inserted and removed therefrom, and a substantially cylindrical cylinder (12) constituting an outer peripheral portion.
Is provided in the cylinder (12) via a fixed sleeve (13) so as to be movable forward and backward, and is advanced by the pressure of the high-pressure air (A) supplied to the forward operating chamber (14) formed at the rear end. A hammer (16) which retreats by the pressure of the high pressure air (A) supplied to a retraction working chamber (15) formed at the front end, and alternately repeats the forward movement and the backward movement.
The expansion / contraction bit (6) that is attached to the front end of the cylinder (12), has a plurality of claws (8) at the outer peripheral end, is hit by the forward movement of the hammer (16), and crushes the earth and sand by the impact force. ), From the rear of the cylinder (12) to the expansion / contraction bit (6) through the center thereof, having a check valve (19) at the distal end thereof, and a water pipe for jetting water toward the earth and sand ahead ( 20) and a water pipe (2) behind the cylinder (12).
0), a ventilation pipe (21) for supplying a high pressure air (A) to the forward working chamber (14) and the backward working chamber (15), and a water pipe (20) behind the cylinder (12).
And a discharge pipe (22) for discharging muddy water (D), which is a mixture of water discharged from the water pipe (20) and excavated soil, and the claw (6) of the expansion / contraction bit (6) 8) is fixed on its base shaft (8b), and the claw tip (8a) is fixed to the bit body (7) by forward rotation.
The earth and sand shall be crushed by protruding from the outer peripheral end, and in the reverse rotation, the bit hammer (7) is settled within the outer peripheral end so that the air hammer (10) can be taken out through the inner diameter of the propulsion pipe (11), The ventilation pipe (21) and the forward working chamber (1) are provided so that the forward movement and the backward movement are alternately applied to the hammer (16).
4) and the retraction chamber (15), a first check valve (23) is provided, and at least the cylinder (1) is provided.
2) an annular passage (25) formed between the fixed sleeve (13) and a through hole (2) formed in the fixed sleeve (13).
6), and fixed sleeve (13) and hammer (16)
An air passage (28) formed by an annular groove (27) formed between the propulsion pipe (11) and the cylinder (1) is provided between the external muddy water (D) and the discharge pipe (22).
2), and a mixing chamber (30) that mixes with the air discharged from the forward working chamber (14) or the backward working chamber (15). (14) A muddy water hammer provided with a second check valve (24) interlocked with the first check valve (23) between the retreat operating chamber (15) and the mixing chamber (30).