JPH07317477A - Drilling device - Google Patents

Abstract

PURPOSE:To conduct rectilinear propagative drilling easily by mounting a dril with a bit on the end face of a nozzle head installed to a shaft and forming a jet at a place, where the ultrahigh pressure water of the drill does not interfere in bit blades. CONSTITUTION:A nozzle 11 is set up to the front section of a nozzle head 10, and connected to an ultrahigh pressure water supply source by an ultrahigh pressure water path 12. The nozzle 11 is connected to a pressure-air supply source from a pressure air path 13, and drilling is performed by a water jet while blowing out pressure air from a pressure-air blow-off port 25. A drill 20 with a bit is fixed onto the nozzle head 10 by four bolts 14, a guide hole is drilled on an axis by a drill 21, and cutting and drilling are carried out by the water jet from a jet 24. The drill 20 with the bit is placed at a frontest end and the drill 21 bores the guide hole at that time, and the whole drilling device is borne, thus constantly holding the direction of drilling in the rectilinear propagative direction.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A conventional drilling device using a water jet is a drive motor 1 having an outer cylinder 3 as shown in FIG.
A nozzle 5 is provided on the rotary shaft 2 of the above, and a water jet J is jetted while rotating and is pushed forward by a rigid hose 4 to drill a hole H in the soil. The drill dust cut by the water jet J is sucked and discharged from the opening of the hole H together with the jet water by a vacuum pump (not shown).

[0003]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention
There were the following problems.

(1) As the drilling distance increases, the hole H bends downward and the horizontal direction is not constant, resulting in poor straightness. (Fig. 4).

(2) In drilling holes by jet injection, cutting residue R of the drilling holes may occur, and the drive motor 1 and the outer cylinder 3 interfere with the cutting residue R and hinder forward movement. (Fig. 5).

(3) When drilling holes by jet injection, if the hardness of the ground to be drilled is not uniform, large drill chips W are generated at the tip. The large drilling waste W passes through the drive motor 1
Since it is not discharged rearward through the gap between the outer cylinder 3 and the outer cylinder 3, the amount of drilling waste W at the tip increases, and drilling becomes difficult (FIG. 6).

An object of the present invention is to provide a drilling device capable of easily drilling straight holes.

[0008]

According to the present invention, a nozzle head for water jet injection is provided on a rotary shaft of a drive motor, a drill with a bit is provided on an end face of the nozzle head, and the nozzle head of the drill is provided. The injection port is provided at a position where the ultra-high pressure water injected from is not blocked by the bit.

[0009]

In the boring device constructed as described above,
Since the drill with a bit is installed at the leading edge, the drill always supports the drilling device while moving and moves forward. Therefore, the bending in the vertical and horizontal directions is reduced, and the drilling direction is kept constant in the straight traveling direction.

Further, since the cutting residue and large shavings are cut by the bit, it is possible to smoothly shave and discharge.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, parts corresponding to those in FIG. 4 are designated by the same reference numerals, and redundant description will be omitted.

In FIG. 1, a nozzle head 10 is fixedly mounted on the front end of the rotary shaft 2, and a nozzle with a bit, generally designated by 20, is fixedly mounted on the front surface of the nozzle head 10.

2 and 3, the nozzle head 10
Nozzle 1 which injects water jet J in the front part of
1 is provided and is connected to an ultrahigh pressure water supply source (not shown) by an ultrahigh pressure water passage 12. In addition, the pressurized air passage 13
Is provided and is connected to a pressurized air supply source (not shown), and the water jet J drills holes while blowing pressurized air from the pressurized air outlet 25. The drill 20 with a bit is fixed to the nozzle head 10 with four bolts 14.

The bit-equipped drill 20 includes a drill 21 on the axis, a pair of large bits 22 perpendicular to the axis, and a small bit 23 that covers a gap between the drill 21 and the bit 22.
And are integrally formed. Further, the injection port 24 of the ultra-high pressure water from the nozzle 11 is opened at a position where it is not obstructed by the drill 21, the large bit 22, and the small bit 23, that is, in the illustrated example, obliquely upward. A pressurized air outlet 25 connected to the pressurized air passage 13 is opened near the injection port 24.

Next, the operation will be described.

The drill 21 of the bit-equipped drill 20 drills a guide hole on the axis, and the water jet J from the jet port 24 carries out cutting to drill the hole H. Large bit 2
In No. 2, the outer periphery is cut when the uncut portion is left by the water jet. Then, the small bit 23 covers the gap between the drill 21 and the large bit 22 for cutting.

Since the drill 20 with the bit is located at the most tip end and the drill 21 supports the entire drilling device by drilling the guide hole, it is less likely to bend vertically and horizontally, and the drilling direction goes straight. Holds constant in direction.

Further, by the bits 22 and 23, the cutting residue R by the water jet J (FIG. 5) and the drilling waste W
(FIG. 6) is cut and jetted together with the jet water to be sucked and discharged from the gap between the outer cylinder and the drive motor and the gap between the outer cylinder and the hole diameter to the rear of the hole, so that the hole can be smoothly and easily drilled.

[0019]

Since the present invention is constructed as described above, it is possible to easily make a straight hole by cutting with a bit-equipped drill provided at the front of the nozzle head.

[Brief description of drawings]

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

FIG. 2 is a front view showing a drill with a bit and a nozzle.

FIG. 3 is a view taken along the line AA of FIG.

FIG. 4 is a side view for explaining a conventional device and its poor straightness.

FIG. 5 is a side view illustrating a conventional device and generation of a cutting residue thereof.

FIG. 6 is a side view illustrating a conventional device and hole scraps thereof.

[Explanation of symbols]

 H ... Hole J ... Water jet R ... Cutting residue W ... Drilling scrap 1 ... Drive motor 2 ... Rotating shaft 3 ... Outer cylinder 4 ... Rigid hose 5 ... ..Nozzle 10 ... Nozzle head 11 ... Nozzle 12 ... High-pressure water passage 13 ... Pressurized air passage 14 ... Bolt 20 ... Drill with bit 21 ... Drill 22 ... Large bit blade 23 ... Small bit blade 24 ... Injection port 25 ... Pressurized air outlet

Front Page Continuation (72) Inventor Michiya Hayashida 2-6-3 Otemachi, Chiyoda-ku, Tokyo Shin Nippon Steel Co., Ltd. New Material Business Headquarters (72) Inventor Isao Yokoyama 3-1, Toyosu, Koto-ku, Tokyo No. 15 Ishikawajima Harima Heavy Industries Co., Ltd. Toji Technical Center (72) Inventor Yuichi Tako 3-15-15 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toji Technical Center (72) Inventor Yukio Sakai No. 2 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagai Gumi Co., Ltd. Tokyo Head Office (72) Inventor Kensei Hayashi No. 2 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagai Gumi Tokyo Head Office (72) Inventor Go Onishi Tokyo 11-1 Haneda Asahi-cho, Ota-ku, EBARA CORPORATION (72) Inventor Kiyokazu Takagi 11-1 Haneda-Asahi-cho, Ota-ku, Tokyo (72) Inventor Takashi Ohno Asahi Haneda, Ota-ku, Tokyo 11th town No. 1 within EBARA CORPORATION

Claims (1)

[Claims] 1. A nozzle head for jetting a water jet is provided on a rotary shaft of a drive motor, a drill with a bit is provided on an end surface of the nozzle head, and ultra-high pressure water jetted from the nozzle head of the drill interferes with the bit. Drilling device characterized by having an injection port provided at a position that cannot