JPS6156392B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pipe-propelling burying excavation device used for press-fitting and laying a pipe into the ground under a road or the like.

[Conventional technology]

As a construction method for laying pipes in the ground of roads etc.
Conventionally, there is a press-in propulsion method. this is,
A propulsion pipe with a cutting edge at the tip is forced into the ground laterally from a shaft using a propulsion jack. However, such conventional technology has the disadvantage that, as the propulsion tube is press-fitted into the ground, it is troublesome to carry out the excavated soil that is forced into the propulsion tube from the cutting edge to the ground.

Therefore, in order to solve this problem,
Propulsion burying has been proposed (Japanese Patent Application Laid-open No. 45007/1983) in which water or air is injected into the excavated soil from a nozzle installed in the blade mouth to cause the excavated soil to flow out through an earth discharge pipe.

[Problem that the invention seeks to solve]

However, the above device injects water and air from the nozzle toward the excavated soil behind the nozzle, and water and the like are not injected toward the excavated soil in front of the nozzle that has been pushed into the blade mouth. There was a risk that the excavated soil would reach the nozzle before being softened and destroyed by the water, and the nozzle would be destroyed by the excavated soil. Furthermore, there is no particular problem when this device is used on soft ground, but when used on hard ground, the excavated soil may become damaged due to water and air not acting on the excavated soil in front of the nozzle. There was a problem that the tube would become clogged at the mouth entrance, and in such a case, there was a fear that the tube would not be able to be propelled further forward.

[Purpose of the invention]

The present invention was devised in view of the above circumstances.
To provide a pipe body propulsion burying excavation device which can perform discharge processing with high efficiency and ease regardless of the condition of excavated soil pushed into the lead pipe as the lead pipe is propelled, and at the same time reduces the pushing force of the lead pipe. With the goal.

[Means for solving problems]

In order to achieve such an object, the present invention provides a leading pipe having a cutting edge at its tip, a push pipe connected to the rear part of the leading pipe for press-fitting and propelling the leading pipe into the ground,
A pressure chamber formed at the front part of the guide pipe into which the excavated soil is pushed in as the guide pipe is propelled; a nozzle that injects high-pressure fine jet water to cut the excavated soil pushed into the pressure chamber; a supply pipe that supplies compressed air for carrying out the excavated soil into the pressure chamber; It is equipped with an earth discharge pipe for pneumatically transporting soil.

[Action of the invention]

According to the present invention, as the leading pipe is propelled by the push pipe, the excavated soil is pushed into the pressure chamber from the tip of the leading pipe. The cut soil is discharged to the outside via a soil discharge pipe using compressed air supplied into the pressure chamber.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 and 2.

In the figure, 1 is a leading pipe made of a steel pipe of a desired diameter, and a cutting edge 2 is formed at the opening edge of its tip to facilitate the penetration of the leading pipe 1 into the ground 6, and a flexible joint is formed at the other end. A steel push pipe 4 is connected via an inlet mechanism 3, and by pressing this push pipe 4 with a propulsion jack (not shown), the leading pipe 1
It is designed to propel the earth into the ground 6.

In addition, a partition wall 5 is provided inside the leading pipe 1 and is located rearward from the cutting edge 2 to partition the inside of the leading pipe 1 into front and rear sections, and when the partition wall 5 and the leading pipe 1 are press-fitted into the ground 6, A pressure chamber 7 is formed at the tip of the leading pipe 1 by the ground 6 that closes when the cutting edge 2 is press-fitted. Further, the partition wall 5
A high-pressure water pipe 8 passing through the center (coinciding with the axis of the leading pipe 1) is rotatably and airtightly supported, and the projecting tip of the high-pressure water pipe 8 on the side of the pressure chamber 7 has a high-pressure fine jet of water. A nozzle 9 for spraying 10 is attached.

The nozzle 9 is for cutting the excavated soil 6a that is pushed into the leading pipe 1 as the leading pipe 1 is propelled, and the direction of the high-pressure fine jet water 10 is diagonally forward at an angle θ with respect to the axis of the high-pressure water pipe 8. As a result, the direction of the high-pressure fine jet water 10 from the nozzle 9 is directed toward the inner circumferential wall surface of the guide pipe 1 located inside the cutting edge 2. This cuts only the excavated soil 6a pushed into the leading pipe 1 as shown in FIG. 2, and prevents the high-pressure fine jet water 10 from acting on the soil into which the leading pipe 1 is pushed forward. It's for a reason.

On the other hand, the rear chamber 1 of the leading pipe 1 is divided by the partition wall 5.
A high-pressure water pipe 13 is connected to the protruding end of the high-pressure water pipe 8 that protrudes into the interior of the pipe 1 through a swivel pipe joint 12. It is connected to a water supply pump (not shown) to supply water at the pressure necessary for cutting the excavated soil 6a to the nozzle 9. A gear 14 is attached to a protruding portion of the high-pressure water pipe 8 into the rear chamber 11, and this gear 14 is meshed with a gear 16 attached to a rotating shaft 15A of a motor 15 installed inside the rear chamber 11. Then, the motor 15 is driven to rotate the high-pressure water pipe 8 at a predetermined rotation speed, and at the same time, the nozzle 9 is rotated.

Furthermore, a compressed air supply pipe 17 is disposed within the guide pipe 1, one end 17a of which passes through the partition wall 5 and opens toward the upper blade opening 2 in the pressure chamber 7, and is connected to the other end. The compressed air supply hose 18 is pulled out to the ground etc. through the push pipe 4, and is connected to a compressed air supply device (not shown) installed on the ground etc., thereby supplying compressed air into the pressure chamber 7. ing. Further, an earth removal pipe 19 is arranged at the lower part of the guide pipe 1 and the push pipe 4 along the length thereof, and this earth removal pipe 19 removes the cut soil cut by the mound flow water from the nozzle 9. It is for transporting and unloading by compressed air applied in the pressure chamber 7, and one end thereof is opened into the pressure chamber 7 through the partition wall 5.
The other end is opened to an excavation and discharge position on the ground or the like.

Next, the operation of the pipe-propelled burial excavation device according to the present invention configured as described above will be explained.

First, when the leading pipe 1 is pressed horizontally into the ground 6 from the cutting edge 2 side, when the pushing force from the propulsion jack acts on the push pipe 4, the leading pipe 1 moves in the ground 6 in the direction of arrow X. It is press-fitted and propelled. In addition, by driving a high-pressure water supply pump and a compressed air supply device installed on the ground etc., water from the high-pressure water supply pump is sent under pressure to the high-pressure water pipe 8 through the water supply pipe 13 and the swivel joint pipe 12, and then from the nozzle 9. While being injected into the pressure chamber 7 as high-pressure fine jet water 10,
The nozzle 9 is connected to the high pressure water pipe 8 by driving the motor 15.
It is rotated around the center. The compressed air from the compressed air supply device is supplied to the hose 18 and the supply pipe 1.
7 into the pressure chamber 7.

In this state, when the excavated soil 6a is pushed into the pressure chamber 7 of the leading pipe 1 as the leading pipe 1 is propelled through the ground 6, the excavated soil 6a is shaped like a column according to the inner diameter of the leading pipe 1. The high pressure fine jet water 10 from the rotating nozzle 9 sequentially cuts the conical shape from the entering tip as shown in FIG. At this time, for example, the rotation speed of the nozzle 9 is set to 60 RPM, and the propulsion speed of the leading pipe 1 is set to 60 RPM.
cm/min, the pitch width of the excavated soil 6a cut by the high-pressure fine jet water 10 is 1 cm, and the excavated soil 6a entering the pressure chamber 7 of the leading pipe 1 can be sufficiently cut. In addition, when the pressure of the high-pressure fine jet water 10 injected from the nozzle 9 is 100 to 200 Kg/cm ² and the jet water diameter (nozzle opening diameter) is 1 to 1.5 mm, the general ground by the high-pressure fine jet water 10 is The effective cutting range for soil type is 20cm or more. Since the water content of the cut and discharged soil produced by the high-pressure fine jet water 10 from the nozzle 9 is only several tens of percent higher than the water content of the natural ground being propelled, the cut and discharged soil flows into the pressure chamber 7. It will not be turned into mud by the sprayed water. This makes it easier to carry out the cut soil and to process it after it has been carried out to the ground, which will be described later. Furthermore, the high-pressure fine jet water 10 flows through the leading pipe 1.
Since the action of the nozzle 9 and the installation angle θ are determined so that the jet is injected onto the inner wall of the pipe that enters inside from the cutting edge 2, the high-pressure fine jet water 10 that collides with the inner wall of the leading pipe 1 spreads in a fan shape while weakening the water pressure. However, since the high-pressure fine jet water 10 does not cut the ground 6 in front of the cutting edge 2 of the leading pipe 1, the straightness of the pipe body due to pre-digging is not impaired. In addition, in soft ground, it is desirable that the injection point of the high-pressure fine jet water 10 to the inner wall of the pipe be further inside than in the case of FIG. 2.

On the other hand, the compressed air blown into the pressure chamber 7 through the hose 18 and the supply pipe 17 is discharged to the outside of the leading pipe 1 through the soil discharge pipe 19, and the cut soil follows the flow of this compressed air. The soil is pushed into the soil discharge pipe 19, and is continuously pneumatically transported in the direction of the exit of the soil discharge pipe 19 by the compressed air flowing inside the soil discharge pipe 19, and is discharged. At this time, depending on the quality of the soil, the cut soil may adhere to the entrance or inside of the soil discharge pipe 19 due to its viscosity, clogging the soil discharge pipe 19, but in such a state, the air in the pressure chamber 7 may Since the pressure increases, the soil that is clogged in the soil discharge pipe 19 due to this pressure will exhibit an extraordinary transport situation, and as a result, the soil in the soil discharge pipe 19 will not be clogged and will be transferred to the exit side of the soil discharge pipe 19. will definitely be pushed out.
Note that the compressed air used for transporting the cut soil is set at a flow rate that provides a flow velocity necessary for transporting the soil within the earth discharge pipe 19.

As described above, according to this embodiment, it is possible to automatically and highly efficiently carry out the soil that has been successively cut by the high-pressure fine jet water 10 as the guide pipe 1 is propelled, without requiring any manpower. Pressure chamber 7 of conduit 1
The excavated soil 6a pushed into the interior is treated with high-pressure fine jet water 10.
Since the nozzle 9 is cut by the excavated soil 6a, the nozzle 9 is not damaged by the excavated soil 6a, and the frictional resistance of the excavated soil 6a pushed into the leading pipe 1 is eliminated, and the propulsive pressing force against the leading pipe 1 is reduced accordingly. This has the effect of increasing the propulsion speed of the leading pipe 1 as the soil removal efficiency improves. Furthermore, excavated soil 6
Since the jet water used for cutting a is a high-pressure fine jet water with a small flow rate from the nozzle 9 that moves in a swirling motion, there is no risk that the soil cut by this jet water will become overly hydrated. This has the advantage that post-processing of the soil that has been carried out is also easy.

〔Effect of the invention〕

As described above, according to the present invention, the frictional resistance of the excavated soil pushed into the leading pipe is eliminated,
It has become possible to reduce the thrust pressure on the leading pipe. Moreover, since the jet water used for cutting the excavated soil is high-pressure fine jet water with a low flow rate,
There is no risk that the soil cut by this jet water will become overly hydrated, and as a result, the post-processing of the carried out soil becomes easier, and as a result, the propulsion speed of the lead pipe can be increased with improved soil removal efficiency. It became possible to do it.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a pipe-driven burial excavation device according to an embodiment of the present invention, and FIG. 2 is an enlarged view of section A in FIG. 1. 1...Lead pipe, 2...Blade mouth, 4...Press pipe, 5...
... Partition wall, 6 ... Ground, 7 ... Pressure chamber, 8 ... High pressure water pipe, 9 ... Nozzle, 10 ... High pressure fine jet water, 1
3... High pressure water pipe, 17... Compressed air supply pipe, 1
9...Earth removal pipe.

Claims (1)

[Claims] 1. A leading pipe having a cutting edge at the tip, a pushing pipe connected to the rear part of the leading pipe and pushing the leading pipe into the ground, and a pushing pipe formed at the front part of the leading pipe into which the excavated soil is pushed as the leading pipe moves. The excavated soil is pushed into the pressure chamber by injecting high-pressure fine jet water diagonally forward and located inside the cutting edge of the leading pipe. a nozzle for cutting, a supply pipe for supplying compressed air for transporting excavated soil into the pressure chamber, and an earth removal pipe communicating with the pressure chamber for pneumatically transporting the excavated soil. drilling equipment.