JPH06346676A - Drilling machine - Google Patents

Abstract

PURPOSE:To execute drilling work under stabilized and uniform state by attaching an outer tube to a driving motor of a drilling machine through supports and by jetting water jet through a nozzle. CONSTITUTION:An outer tube 8 is attached to the outside of a driving motor 2 through a plurality of supports 7, and end edge 8a of the outer tube is positioned in front of a nozzle 1. When drilling a bore, water jet 4 is ejected through a nozzle 1 while the nozzle is driven in revolution by the driving motor 2, and a drilling machine A is thrust forward with a propelling device. The drilling machine is moved forward continuously at a speed corresponding to the drilling speed by the water jet 4, and excavated earth is allowed to flow, together with the jetting water, to a bore 6 through a gap between the internal wall of the outer tube 8 and the outer circumference of the driving motor 2, and is furthermore discharged to the outside. Thereby, the drilled bore 6 is made in a uniform size slightly larger than the external size of the outer tube 8, and the drilling is made stably without being influenced by self-weight of the drilling machine even in the case of horizontal drilling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling device using a water jet.

[0002]

2. Description of the Related Art A conventional drilling device using a water jet will be described with reference to FIG. The nozzle 1 is provided at the tip of the rotary shaft 3 of the drive motor 2, jets a water jet 4 while rotating, and is pushed forward by a rigid hose 5 to drill a hole 6 in the soil. Then, the cut soil is discharged to the outside through the gap between the drive motor 2 and the inner wall of the drilled hole 6 together with the jet water.

In this drilling device, a drilling diameter larger than the outer diameter of the drive motor 2 is required for stable drilling and muddy water discharge.

[0004]

In the conventional drilling device, if the drilling diameter is larger than the outer diameter of the drive motor, when drilling in the horizontal direction, the gap 9a between the drive motor 2 and the hole 6 is large, and therefore, However, there is a problem that the drilling locus is largely bent downward as shown in the drawing due to the weight of the drilling device.

The present invention, even when drilling horizontally,
An object of the present invention is to provide a drilling device capable of holding a drilling trajectory substantially horizontally.

[0006]

According to the present invention, a nozzle for water jet injection is provided at the tip of a rotary shaft of a drive motor, and an outer cylinder is attached to the drive motor via a support, and the outer cylinder is attached to the outer cylinder. The end edge is located in front of the nozzle in the drilling direction.

It is preferable that one end of a rigid hose is connected to the drive motor and a propulsion device is provided at the other end of the rigid hose.

Further, it is preferable that a hose for supplying a working medium of a drive motor and a hose for supplying high-pressure water for a water jet from a nozzle are incorporated in the rigid hose.

[0009]

In the boring device constructed as described above,
While propelling the water jet from the rotating nozzle to scrape the soil, the propulsion device pushes the drilling device forward. The ground soil, together with the jet water, passes through the gap between the inner circumference of the outer cylinder and the outer circumference of the drive motor, and is discharged to the outside from the drilled hole.

In this case, the holes cut by the water jet are uniform and slightly larger than the outer diameter of the outer cylinder, and therefore the gap between the outer cylinder and the hole is small. Therefore, even when drilling in the horizontal direction, the drilling locus does not largely bend downward due to the weight of the drilling device and the like, and the drilling locus is held substantially horizontally.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the nozzle 1 of the hole drilling apparatus indicated by reference numeral A is provided at the tip of the rotary shaft 3 of the drive motor 2. The drive motor 2 is composed of a hydraulic motor or an air motor, and the rotary shaft 3 is provided with a passage (not shown) for high pressure water to the nozzle 1.

An outer cylinder 8 is provided on the outside of the drive motor 2 via a plurality of (four pairs in the illustrated example) columns 7, and an end edge 8a of the outer cylinder 8 is formed in a drilling direction F from the nozzle 1. It is located in front of. The outer cylinder 8 is not limited to the cylindrical shape shown in the figure, and as shown in FIG. 3, it is composed of a plurality of (8 in the illustrated example) divided portions 8A in the circumferential direction,
You may each attach to the drive motor 2 by the support | pillar 7.

One end of a rigid hose 5 is connected to the rear end of the drive motor 2. At the other end of the rigid hose 5, a propulsion device (not shown) is provided. This propulsion device is composed of a hydraulic cylinder to which a rigid hose 5 is connected, a hydraulic drive roller that clamps the rigid hose 5 and sends it out, and these hydraulic circuits are pushed forward by the propulsion device together with the drive motor 2. A hydraulic relief valve or the like is provided to stop the propulsion when the outer cylinder 8 is locked to the ground before drilling and the forward movement is stopped. In addition, inside the rigid hose 5,
A hose (not shown) for supplying the working medium of the drive motor 2,
A hose (not shown) for supplying high-pressure water to the nozzle 1 is built in.

Next, the operation will be described.

At the time of drilling, the drive motor 2 drives the nozzle 1
The water jet 4 is jetted while rotating, and the propulsion device pushes the drilling device A with a substantially constant thrust. The water jet 4 scrapes the ground in front of the outer cylinder 8, and the outer cylinder 8 moves forward by the amount of the ground scraped, and when the boring device A stops by contacting the uncut portion, the hydraulic relief valve By the action of, the propulsion of the propulsion device is automatically stopped. In fact,
Since the soil is continuously scraped by the water jet 4,
The drilling device A continuously advances at a speed corresponding to the drilling speed of the water jet 4.

Therefore, even if the soil quality changes during drilling, the drilling device A automatically advances at the optimum drilling speed. That is, a hole 6 having a larger diameter than the target is drilled,
A hole 6 having a stable and uniform diameter is drilled without making a hole in the middle.

The soil scraped by the water jet 4 as described above flows with the jet water into the drilled hole 6 through the gap 9 between the inner wall of the outer cylinder 8 and the outer periphery of the drive motor 2, and the hole is further drilled. It is discharged to a tank or the like (not shown) installed outside through a vacuum hose (not shown) connected to the opening 10 of 6.

The holes 6 drilled as described above are uniform and slightly larger than the outer diameter of the outer cylinder 8. Therefore, even when drilling in the horizontal direction, the drilling locus does not largely bend downward due to the influence of the weight of the drilling apparatus A, etc.
It is held substantially horizontally and stable drilling is performed.

[0020]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, by reducing the gap between the outer cylinder and the drilled hole, the drilling locus can be made even when drilling horizontally. It can be kept almost horizontal.

[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 the line AA of FIG.

FIG. 3 is a drawing corresponding to FIG. 3, showing another embodiment of the outer cylinder.

FIG. 4 is a vertical sectional view showing an example of a conventional device.

[Explanation of symbols]

 A ... Drilling device 1 ... Nozzle 2 ... Drive motor 3 ... Rotating shaft 4 ... Water jet 5 ... Rigid hose 6 ... Hole 7 ... Support post 8, 8A ..Outer cylinders 9, 9a ... Gap 10 ... Openings

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiyuki Nasu 3-chome 1-15, Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toni Technical Center (72) Inventor Isao Yokoyama 3-chome, Toyosu, Koto-ku, Tokyo No. 1-15 Ishikawajima Harima Heavy Industries Co., Ltd. Toni Technical Center (72) Inventor Yuichi Tako 3-15-15 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toni Technical Center (72) Inventor Hayashida Doya 2-6-3 Otemachi, Chiyoda-ku, Tokyo Within Nippon Steel Co., Ltd. (72) Inventor Ryuichi Sekiguchi 2-1, Tsukudo-cho, Shinjuku-ku, Tokyo Kumagai-gumi Tokyo Head Office (72) Inventor Yukio Sakai 2-1, Tsukudo-cho, Shinjuku-ku, Tokyo Kumagai Gumi Co., Ltd. Tokyo Head Office (72) Inventor Keisuke Shimazaki Tokyo 2-1-1 Tsukudo-cho, Shinjuku-ku, Kumagai Gumi Co., Ltd. Tokyo Head Office (72) Inventor Kazuaki Harada 2-1-1 Tsukuto-cho, Shinjuku-ku, Tokyo Kumagai Gumi Tokyo Head Office (72) Inventor Takashi Ohno Ota, Tokyo 11-1 Haneda Asahi-machi, Ebara Manufacturing Co., Ltd. (72) Inventor Tsuyoshi Onishi 11-11 Haneda Asahi-machi, Ota-ku, Tokyo Tokyo (72) Inventor Kiyokazu Takagi Haneda Asa-machi, Ota-ku, Tokyo No. 11 No. 1 within EBARA CORPORATION

Claims (1)

[Claims] 1. A nozzle for water jet injection is provided at a tip of a rotary shaft of a drive motor, and an outer cylinder is attached to the drive motor via a support, and an end edge of the outer cylinder is located forward of the nozzle in a drilling direction. A drilling device characterized by being located at.