JPH0339157B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Field of Industrial Application The present invention relates to a method for laying pipes and a laying guide device for burying pipes such as water supply and sewerage pipes and power cable pipes in the soil.

(2) Conventional technology When burying pipes such as power cable pipes in the ground,
A launch shaft and a destination shaft are formed in the ground, a propulsion device is set in the launch shaft, an auger screw is placed inside a buried pipe that is pushed in the axial direction by the propulsion device, and the rotation of the auger screw Conventionally, a construction method has been widely adopted in which a horizontal hole is drilled in the soil and the auger screw and buried pipe are pushed in the axial direction.

However, in the above-mentioned installation method, the soil is scraped away, which causes loosening of the soil layer, and when joining the auger crease and buried pipes, the leading and trailing buried pipes must be aligned with the same axis. As a practical matter, it is impossible to connect the buried pipe as a straight line, so there is a disadvantage that the buried pipe often bends, and the buried pipe cannot be laid straight.

(3) Problems to be Solved by the Invention This invention solves the above-mentioned conventional drawbacks, and aims to lay underground pipes in a straight line without loosening the soil layer.

(4) Means for solving the problems In order to solve the above problems, this invention
An earth removal pipe with a built-in hammer device is slidably fitted inside the buried pipe that is pushed in the axial direction by a propulsion machine, and the tip of the earth removal pipe is pushed in the axial direction using the inner peripheral surface of the buried pipe as a guide. It is movably provided, and the tip comes into contact with a step on the inner circumferential surface of the leading pipe whose outer diameter is approximately equal to the outer diameter of the buried pipe, and when the hammer device is operated, the earth removal pipe is struck in the axial direction, and the tip is moved. Alternating and repeating the action of advancing the conduit and the follow-up action of pushing the buried pipe in the axial direction and bringing the tip end into contact with a step formed on the outer periphery of the tip end of the leading pipe,
The soil entering the soil discharge pipe from the lead pipe is removed to the outside by pulling out the soil discharge pipe, and a buried pipe is laid underground.

(5) Embodiment Figure 1 shows a laying guide device used in the pipe laying method, in which an earth removal pipe 1 is slidably fitted inside a buried pipe A laid in the soil. ,
A leading pipe 30 is provided on the front side of the earth removal pipe 1 and is movable in the axial direction using the inner circumferential surface of the tip end of the buried pipe A as a guide.

An earth removal storage space 2 and a hammer storage space 3 are provided inside the earth removal pipe 1, and a hammer guide cylinder 4 is disposed in the hammer storage space 3.
is supported by a partition wall 5 that partitions both the spaces 2 and 3.

Inside the hammer guide tube 4, there is a hammer device 10 whose driving source is compressed air, and a hammer device 1 therein.
A spring 11 for pressing toward the partition wall 5 is disposed over the whole of the partition wall 5, and when the hammer device 10 is actuated, the protrusion 12 provided on the partition wall 5 is struck in the axial direction, and the earth removal pipe 1 is moved in the axial direction. Move to.

Here, as the hammer device 10, any conventionally known hammer device can be used.
The figure shows one example.

This hammer device 10 has a rear cap 14 connected to the end of a cylinder 13 with a screw, and an air supply port 15 provided in the rear cap 14.
When compressed air is supplied to 5, the compressed air causes the check valve 16 provided in the passage of the rear cap 14 to close.
will be opened. Therefore, compressed air flows from the passage in the rear cap 14 to the inner passage 18 of the rigid valve 17 provided at the inner end of the cylinder 13.

A piston 19 is slidably provided inside the cylinder 13, and the piston 19 allows a first chamber 20 and a second chamber 2 to be placed inside the cylinder 13.
1 is formed.

An insertion hole 22 is provided in the axis of the piston 19, and the tip of the rigid valve 17 is inserted into the insertion hole 22. Further, two circumferential grooves 23 and 24 are formed at the end of the inner circumferential surface of the piston 19, one circumferential groove 23 and the first chamber 20 communicate with each other through a first passage 25, and the other circumferential groove 24 and the second It communicates with the chamber 21 through a second passage 26. Therefore, the compressed air supplied inside the rigid valve 17 flows from the hole 27 provided at the tip of the valve 17 into the circumferential groove 23, flows into the first chamber 20 from the first passage 25, and moves the piston 19 into the first chamber 20. 3 Move it to the right side of the figure.

When the piston 19 moves to a position where the circumferential groove 24 and the hole 27 match, the compressed air supplied inside the rigid valve 17 then flows into the second chamber 21 from the circumferential groove 24 and the second passage 26. . As a result, the piston 19 rapidly moves to the left in FIG. 3 and strikes the protrusion 12.

Note that when the piston 19 moves toward the protrusion 12, the air in the first chamber 20 is compressed, so when the piston 19 is located on the right side in FIG. form,
Alternatively, an automatic switching valve may be provided in the passage that communicates the first chamber 20 with the atmosphere so that the compressed air in the first chamber 20 is automatically exhausted to the atmosphere so that the piston 1
Make sure that there is no problem with the movement of 9.

The outer diameter of the leading pipe 30 is approximately equal to the inner diameter of the buried pipe A, and a step 3 is formed on the outer peripheral surface of the tip.
1 is formed, and a large-diameter shaft portion 32 extending from the stepped portion 31 to the tip protrudes outward from the tip of the buried pipe A. The outer diameter of this large diameter shaft portion 32 is approximately equal to the outer diameter of the buried pipe A.

Further, the inner peripheral surface of the tip portion of the leading tube 30 is a tapered surface 3.
3, an earth removal guide cylinder 34 is provided continuously at the end of the tapered surface 33 and coaxially with the leading pipe 30, and the tip of the earth removal pipe 1 is disposed between the earth removal guide cylinder 34 and the leading pipe 30. When fitted, the tip of the earth removal pipe 1 becomes the leading pipe 3.
It is in contact with a stepped portion 35 formed on the inner circumferential surface of the tip portion of 0.

The laying guide device shown in the embodiment has the above-mentioned structure, and in order to lay the underground pipe A underground using this guide device, a starting hole 40 must be made in the ground as shown in FIGS. 4 to 6. A rail 41 is laid at the bottom of the starting shaft 40.

The rail 41 has a propulsion device 4 for pushing the buried pipe A.
2 is slidably provided, and a plunger 43 provided on the propulsion device 42 is connected to a backup member 44 whose position can be set along the rail 41.

Then, the leading pipe 3 is
0 and the earth removal pipe 1 are attached, and a wire 45 wound with a winch or the like is connected to the earth removal pipe 1. Further, an air supply hose 46 is connected to the air supply port 15 of the hammer device 10 provided inside the earth removal pipe 1, and compressed air is supplied to the air supply hose 46 to operate the hammer device 10.

Now, when compressed air is supplied to the supply hose 46, the piston 19 of the hammer device 10 moves back and forth,
When the piston 19 moves forward, it hits the protrusion 12, so the earth removal pipe 1 moves in the axial direction, and the leading pipe 30 is pressed in the axial direction by the earth removal pipe 1.
Therefore, the leading pipe 30 moves in the axial direction along the inner circumferential surface of the buried pipe A, and the outer step portion 31 of the leading pipe 30 moves in the axial direction.
A gap is created between the pipe A and the tip of the buried pipe A. Further, since the earth discharge pipe 1 moves relative to the hammer device 10, the spring 11 is compressed (see FIG. 2), and the piston 19 retreats. (see Figure 1).

After the guide pipe 30 is advanced by a predetermined amount by the operation of the hammer device 10, when the buried pipe A is pushed in the axial direction by the operation of the propulsion device 42, the buried pipe A is pushed forward by a predetermined amount.
The tip of the guide tube 30 comes into contact with the outer step 31 of the guide tube 30.

Therefore, the action of the piston 19 of the hammer device 10 striking the protrusion 12 to advance the leading pipe 30 by a predetermined amount and the action of pushing the buried pipe A in the axial direction by the propulsion device 42 are alternately and repeatedly performed. In this way, the underground pipe A can be laid underground.

Furthermore, as the buried pipe A moves forward, the soil will move towards the lead pipe 3.
Since the earth enters the earth removal storage space 2 of the earth removal pipe 1 from 0, when the buried pipe A moves forward by a predetermined stroke, the earth removal pipe 1 is pulled out and discharged to the outside.

When pulling out the earth removal pipe 1, the wire 45 connected to the earth removal pipe 1 is wound up with a winch or the like. Then, in order to position the earth removal pipe 1 after earth removal at the tip of the buried pipe A, the piston 19 of the hammer device 10 hits the protrusion 12, and the buried pipe A is moved forward by the impact.

(6) Effects As described above, according to the present invention, the leading pipe, which is slidable in the axial direction using the inner circumferential surface of the tip end of the buried pipe as a guide, is advanced by the impact action of the hammer device, and the leading leading pipe is Since the buried pipe is made to follow using the guide, even if there is a tilt between the preceding buried pipe and the following buried pipe due to the addition of buried pipes, the buried pipe can be directed to the target position. Can be laid in a straight line.

In addition, the outer diameter dimension of the leading end of the leading pipe is
Since it is approximately equal to the outer diameter of the buried pipe, the propulsive force that pushes the buried pipe in the axial direction is small, and a small, easy-to-handle propulsion device can be used.

Furthermore, since the lead pipe is moved forward by being struck by a hammer device, the soil layer does not loosen, and the soil that invades inside is narrowed down by the movement of the lead pipe in the axial direction, resulting in a water-stopping effect on groundwater. This makes it easier to work even in large spring formations.

In addition, since the buried pipe is laid by the process of striking the lead pipe, propelling the buried pipe, and removing earth, there is no change in the propulsion force of the buried pipe, and long-distance burial is possible.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a laying guide device according to the present invention, FIG. 2 is a longitudinal sectional front view showing the operating state of the same, and FIG. 3 is a longitudinal sectional front view showing an embodiment of the same hammer device. 4 to 6 are schematic diagrams showing the order in which buried pipes were laid using the same device as above. A...Buried pipe, 1...Earth removal pipe, 2...Earth removal storage space,
3... Hammer storage space, 10... Hammer device, 30...
Leading pipe, 31, 35... Step section, 42... Propulsion device, 45
...Wire.

Claims (1)

[Claims] 1. An earth removal pipe with a built-in hammer device is slidably fitted inside a buried pipe pushed in the axial direction by a propulsion device, and the tip of the earth removal pipe is inserted into the inner periphery of the buried pipe. It is provided so as to be movable in the axial direction using the surface as a guide, and comes into contact with a step on the inner circumferential surface of the leading pipe, the outer diameter of the tip of which is approximately equal to the outer diameter of the buried pipe, and the removal pipe is moved by the operation of the hammer device. The operation of moving the lead pipe forward by striking it in the axial direction and the follow-up action of pushing the buried pipe in the axial direction and bringing the tip into contact with the step formed on the outer periphery of the tip of the lead pipe are alternately repeated. A method of laying pipes in which soil that enters the soil discharge pipe from the conduit is removed to the outside by pulling out the soil discharge pipe, and then the buried pipe is laid underground. 2 Consisting of an earth removal pipe that can be fitted inside the buried pipe pushed in the axial direction by a propulsion device, and a leading pipe that is provided so as to be slidable in the axial direction along the inner peripheral surface of the buried pipe, and An earth removal storage space and a hammer storage space are formed inside the earthen pipe from the tip end, and a hammer device for hitting the earth removal pipe in the axial direction is provided in the hammer storage space, and the inner and outer peripheral surfaces of the leading pipe are A stepped portion is formed at the tip of each of the discharging pipes and the buried pipe, and the outer diameter of the tip of the leading portion is approximately equal to the outer diameter of the buried pipe. A pipe laying guide device that connects a wire that is wound up with a winch.