JPH08240094A - Propelling and sediment discharge method for buried pipe and device therefor - Google Patents

Abstract

PURPOSE: To improve efficiency for laying a pipe underground. CONSTITUTION: When a propelling tube 3 is pushed underground from a shaft 2 approximately in a horizontal direction via a propelling device, a high pressure fluid is jetted from a front jet nozzle 6a laid on the tube 3 near the leading end thereof, toward a propelling direction. Also, a high pressure fluid is jetted back from a rear jet nozzle 7a for jetting the high pressure fluid in a direction opposite to the nozzle 6a, thereby removing the earth from the tube 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for propulsion and earth removal of an underground buried pipe used for water and sewerage, and for various businesses such as electric power, communication and gas, and an apparatus therefor.

[0002]

2. Description of the Related Art When the various underground pipes described above are pushed into the ground from a side wall of a shaft or the like through a propulsion device such as a hydraulic jack, it is necessary to take out the earth and sand from the pushed pipe. In order to remove the soil in the pipe, it was possible to remove the soil in the pipe manually if the pipe diameter was large enough for workers to enter, but if the pipe diameter is small, use an earth auger, etc. The screw was used for soil removal.

[0003]

All of the above-mentioned conventional soil discharging methods have a problem in that the work efficiency is poor, and the method using human power is not preferable in terms of work safety.

[0004]

In order to solve the above-mentioned problems, the method of propulsion and earth removal of an underground buried pipe according to the present invention is to push the excavation pipe into the ground in a substantially horizontal direction from a vertical shaft via a propulsion device. In this case, the high-pressure fluid is injected in the excavation direction by the front injection nozzle provided near the tip of the excavation pipe, and the high-pressure fluid is discharged backward by the rear injection nozzle that injects the high-pressure fluid in the direction opposite to the front injection nozzle. It is jetted so that the earth in the excavation pipe is discharged.

In addition, an injection pipe for injecting a high-pressure fluid to the front and the rear is provided in the excavation pipe pushed into the ground by the propulsion device to construct a propulsion and earth removal device for the underground buried pipe.

[0006]

As described above, in the present invention, the high-pressure fluid is jetted in the excavation direction by the forward injection nozzle provided near the tip of the excavation pipe. It can be softened to facilitate the promotion of the tunnel. In this case, since the front injection nozzle is set at a position slightly retracted from the front end of the excavation pipe, there is no fear that the ground outside the excavation pipe will be loosened.

Further, in the present invention, since the high pressure fluid is injected backward by the rear injection nozzle which injects the high pressure fluid in the direction opposite to the front injection nozzle, the earth in the excavation tube is discharged at a high pressure. Since it is efficiently sent backward by the jet stream, the work efficiency can be significantly improved.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the figure, 1 is the ground, 2 is a vertical shaft provided in the ground 1, 3 is a digging pipe pushed from the side wall of the vertical shaft 2 into the ground 1 by a propulsion device (not shown) such as a hydraulic jack in the direction of arrow F, 4
Is an earth-moving container installed at the bottom of the shaft 2, and 5 is a screen provided therein.

In this embodiment, injection pipes 6 and 7 for high-pressure fluid connected to a high-pressure fluid supply device (not shown) such as water or air are provided in the excavation pipe 3, and one of the injection pipes 6 is provided. The front injection nozzle 6a is provided at the tip portion, and the front injection nozzle 6a is provided near the tip portion of the excavation pipe 3, for example, about 50 from the tip.
It is set inside the cm by the support member 8 so that the high-pressure fluid is jetted in the excavation direction.

A rear injection nozzle 7a is provided at the tip of the other injection pipe 7, and the rear injection nozzle 7a is directed in the direction opposite to the front injection nozzle 6a.
It is set by the support member 8 and the high-pressure fluid is jetted rearward by the rear jet nozzle 7a so that the earth and sand 9 in the tunnel 3 is discharged rearward. The discharged earth and sand enter the earth discharging container 4, only the earth and sand 10 are accumulated above the screen 5, and the water is accumulated downward through the screen 5. 11
Is the water.

[0011]

As described above, in the present invention, the high-pressure fluid is jetted in the excavating direction by the forward jet nozzle 6a provided near the tip of the excavating pipe 3, so that the front end of the excavating pipe 3 is ejected. The ground can be softened by the high pressure jet flow to facilitate the promotion of the excavation tube 3. In this case, since the front injection nozzle 6a is set at a position slightly retracted from the front end of the excavation pipe 3, there is no risk of loosening the ground outside the excavation pipe 3.

Further, in the present invention, since the high pressure fluid is injected backward by the rear injection nozzle 7a which injects the high pressure fluid in the direction opposite to the front injection nozzle 6a, the excavation pipe 3 is discharged. Since the earth and sand 9 in 3 is efficiently sent to the rear by the high-pressure jet flow, according to the present invention, there is an effect that the working efficiency can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of Codes] 1 Ground 2 Vertical shaft 3 Drilling pipe 4 Soil discharge container 5 Screen 6 Injection pipe 6a Front injection nozzle 7 Injection pipe 7a Rear injection nozzle 8 Support member 9,10 Earth and sand 11 Water

Claims (2)

[Claims] 1. When the excavation pipe is pushed into the ground from a vertical shaft in a substantially horizontal direction via a propulsion device, a high-pressure fluid is ejected in the excavation direction by a front injection nozzle provided near the tip of the excavation pipe. A propulsion and a discharge of an underground buried pipe, characterized in that a high pressure fluid is injected backward by a rear injection nozzle that injects a high pressure fluid in a direction opposite to the front injection nozzle to discharge the earth in the excavation pipe. Soil method. 2. A propulsion and earth removing device for an underground pipe, wherein an injection pipe for injecting a high-pressure fluid forward and backward is provided in the excavation pipe pushed into the ground by the propulsion device.