JPS58123993A - Excavating method and screw nozzle used for said method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an excavation method in which a face is excavated and propelled by soil disturbance and scouring using water flow, and a screw nozzle used therein.

In conventional excavation methods using water jets, the face was excavated by injecting high-pressure water from the tip of the nozzle in only one direction forward, so the high-pressure water was only injected at one point on the face, and the excavation cross-section The disadvantage was that it was small.

Therefore, if a large excavation cross section is required, multiple nozzles are required, and since the nozzle locations are fixed, if the hardness of the ground is not uniform, only the soft areas will be affected. 144 occurred, causing the propulsion tubes to meander. Furthermore, when using a plurality of nozzles, there is also a drawback that the cost is high.

Furthermore, conventional nozzles have the disadvantage that they are expensive and wear out easily, resulting in a short lifespan.

The present invention solves these conventional drawbacks and uses a new screw nozzle that allows a bidirectional jet water stream to pass in a continuous circular trajectory on the face surface, thereby smoothly scouring and excavating the face surface. The purpose is to

The present invention provides a screw nozzle which is rotatably provided at the tip of an injection pipe, whose outer periphery is protected by a sleeve, and in which the screw nozzle is provided with a nozzle hole that is eccentric and faces diagonally with respect to the rotational axis direction. By supplying high-pressure water to the injection pipe, the nozzle is rotated by the reaction force of the water pressure while jetting water diagonally forward, and the high-pressure jet water stream is circularly applied to the face of the ground of the required cross section to be excavated. An excavation method characterized by smoothly excavating and scouring a face surface by continuously tracing a trajectory, and a screw nozzle rotatably provided at the tip of an injection pipe, the outer periphery of which is protected by a sleeve, and a screw nozzle. The present invention relates to a screw nozzle characterized in that it is provided with a nozzle hole that is eccentric and faces diagonally with respect to the rotational axis direction.

FIG. 1 is a sectional view showing the configuration of a screw nozzle according to the present invention, in which a screw nozzle (2) is rotatably attached to the tip of an injection pipe (l) by a sleeve (3),
The eccentric nozzle hole (2a) of the screw nozzle (2) is provided with a required eccentricity and taper with respect to the rotation axis of the nozzle. An oil seal (4) for water sealing is provided between the outer periphery of the screw nozzle (2) and the inner surface of the sleeve (3), and the screw nozzle ( 2
) is supported in the axial and rotational directions. In addition to the eccentric nozzle hole (2a), there is also a straight nozzle hole (2b) as in the past.
) may also be attached.

FIG. 4 shows an example of a propulsion method using a device having such a configuration. In the figure, (7) is a support frame that supports the injection pipe full, and is configured to be movable back and forth with respect to the press-fit pipe (8).

Now, when high-pressure water is sent into the injection pipe +11, the high-pressure water is injected diagonally from the eccentric nozzle hole (2a) from the tip of the screw nozzle (2), and the nozzle hole (2a)
) is provided eccentrically and diagonally, c, 6. 9, Injection Wakayu l 'J z -/Yu, □2,1, Rotates under light force. Therefore, the trajectory of the injected high-pressure water on the face becomes a circle, and the face is smoothly scoured and excavated to reduce the resistance at the tip of the press-fit pipe (8). That is, since the tip end surface of the press-fit tube (8) is excavated, the propulsion is performed smoothly.

By moving the support frame (7) forward at the tip of the press-in pipe, the center of the face can be excavated as shown in Fig. As shown in FIG. 6(a), the support frame (7) can be moved backward to increase the discharge capacity. Further, depending on the ground, a conventional nozzle with a straight nozzle hole (2b) may be used. FIG. 6 (bl is a drawing seen from the front of the press-in pipe. Note that a separate jet nozzle may be used to discharge excavated soil.

Fig. 7 shows another structure for attaching the screw nozzle according to the present invention, in which a known water swivel (11) is attached to the tip of the injection pipe (11), and a bearing (11) is attached to the water swivel (11). A screw nozzle (12) is attached to an inner cylinder (16) which is rotatably supported by an oil seal (14) and an oil seal (15), and the outer periphery of the screw nozzle (12) is protected by a sleeve (13). In the figure, (12a) is an eccentric nozzle hole.

According to this example, the screw nozzle can be easily attached using a water swivel that has already been reprinted.

As described above, the present invention has the following effects.

■ The excavation area on the face can be freely selected and operated with one screw nozzle.

■ Since the screw nozzle is rotated by the reaction force of water, other machines are not connected to it.

■ When increasing the face surface, only one nozzle is needed instead of multiple in the past.

■ The high-pressure jet water follows a circular orbit on the face, allowing the face to be scoured and excavated uniformly.

■ Since the outer periphery of the screw nozzle is protected by a sleeve, only the inexpensive sleeve will wear out, extending the life of the expensive screw nozzle itself.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing the configuration of a screw nozzle according to the present invention, and FIGS. 2 and 3 are 1-1 in FIG. 1, respectively.
4 is an explanatory diagram showing an example of applying the excavation method of the present invention to a propulsion method, and FIGS. 5 and 6 are respectively a method of operating a screw nozzle in the above-mentioned propulsion method. FIG. 7 is a longitudinal sectional front view showing another embodiment of the screw nozzle attachment according to the present invention. Patent Applicant Masu 1) Yoko Agent Sunshi Ito (and 2 others) Kuzu 1ryI Figure 4

Claims (1)

[Scope of Claims] 1. A screw nozzle is rotatably provided at the tip of the injection pipe, the outer periphery of the screw nozzle is protected by a sleeve, and the screw nozzle has a nozzle hole that is eccentric and faces diagonally with respect to the axis of rotation. The provided slurry 1-nozzle is rotated by the reaction force of the water pressure while jetting water diagonally forward by supplying high-pressure water to the jetting pipe, and the face surface of the ground of the required cross section to be excavated is An excavation method characterized by a high-pressure jet stream that continuously traverses a circular trajectory to smoothly excavate and scour the face. 2. A screw nozzle is rotatably provided at the tip of the injection pipe, and its outer periphery is protected by a sleeve, and the screw nozzle is provided with a nozzle hole that is eccentric and faces diagonally with respect to the rotation axis direction. screw nozzle.