JPH0842279A - Drilling device and drilling method for continuous hole - Google Patents

Abstract

PURPOSE:To make small the caliber of each of bits to increase drilling speed and to control intermittent impact of the bits by crushing spaces with forward blades of a rod holder to form a continuous hole after drilling is made with rod bits. CONSTITUTION:Parts before collars 7 of rods 2 on the front ends are fitted to a plurality of fitting holes of a rod holder 3, and the rear end of the holder 3 is held to the collars 7. Rod bits 4 are loaded to the front ends of the rods 2, and the rears of the rods 2 are mounted respectively to a drill to bore holes while providing rotation, strikingness and thrust for the bits. At that time, circular holes are bored in rows with a plurality of rod bits 4 at specific intervals between them, and hard blades 33 projected forward are provided to intervals between the rods 2 of the holder 3. In addition, space parts of the excavated circular holes are crushed with the blades, and adjacent holes are connected to each other to bore a continuous hole. According to the constitution, the continuous hole can be obtained even if the diameter of each of the bits 4 is small, drilling speed is increased, and intermittent impact is controlled to make it possible to prevent early damage in the bits 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous hole drilling device suitable for use in forming a free surface on rock in the fields of mining, civil engineering and the like.

[0002]

2. Description of the Related Art Recently, in order to prevent pollution due to vibration and noise in tunnel construction, etc., a continuous hole (slot) is drilled by a rock drilling machine, and this continuous hole is used as a free surface.
The method of crushing hard rock with no blast or low vibration blast is often adopted.

The continuous holes are, for example, Japanese Patent Publication No.
As disclosed in No. -11775, a plurality of drilling rods are supported in parallel, and a lock bit is attached to the tip of each of these drilling rods, and the rear end is attached to a rock drill, When viewed from the front, the outer circumferences of the rock bits adjacent to each other were overlapped with each other and the holes were punched at the same time. By this drilling, as shown in FIG. 9, a row of holes whose outer peripheral portions communicate with each other can be obtained.

In the above conventional method, it is necessary to make the outer circumferences of the adjacent lock bits overlap each other when viewed from the front and prevent the adjacent lock bits from contacting each other in the drilling hole. The front and rear positions of the matching bits are alternately shifted so that the large-diameter head portion of the rear bit is located on the small-diameter body portion of the front bit or on the side portion of the drilling rod rearward thereof.

[0005]

However, in order to make the holes drilled by the adjacent bits continuous with each other, it is necessary to use a bit having a relatively large diameter, so that there are many design restrictions and the diameter is large. However, there was a problem in that the larger the value was, the poorer the drilling efficiency was. In addition, since the bit for drilling the hole located in the middle of the continuous holes has already been drilled on both sides of the drilled portion, the load applied to the bit is small and the threaded portion due to the blanking effect is used. Abnormal wear such as was likely to occur. Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional continuous hole punching device and to provide a hole punching device capable of efficiently making a continuous hole.

[0006]

In order to solve the above problems, the present invention employs the following configurations. First, in the drilling device according to the present invention, a plurality of tip rods each having a lock bit mounting portion at a tip portion thereof and a large diameter collar extending in a diameter direction at a middle portion thereof, and the tip rods are provided. And a plurality of fitting holes into which the plurality of tip rods are respectively fitted are provided in rows at intervals, and the tip ends are provided at intervals between the plurality of fitting holes. And a rod holder to which a hard blade protruding toward the side is fixed.

Further, in the method for drilling continuous holes according to the present invention, a plurality of tips having a lock bit mounting portion at the tip and a large diameter collar extending in the diametrical direction at the middle are provided. A rod, a lock bit attached to a tip portion of the tip rod, and a plurality of fitting holes into which the plurality of tip rods are respectively fitted are provided in rows at intervals, and the plurality of fitting holes are provided. After drilling a continuous hole using a punching device comprising a space holder and a rod holder to which a hard blade protruding toward the tip side is fixed at least on one side end portion, the continuous hole is punched. When drilling a continuous hole adjacent to the hole, it is formed with a hard blade at the side end of the rod holder without overlapping the bit at the side end of the subsequent continuous hole on the hole at the side end of the preceding continuous hole. By the cracks made
A feature of the present invention is that a subsequent continuous hole is formed at a position where the continuous holes are continuous with each other.

[0008]

In this drilling device, the front portion of the tip rod is fitted into the plurality of fitting holes of the rod holder, and the rear end of the rod holder is the collar of the tip rod.
To hit. Further, a lock bit is attached to each of the tips of the tip rods fitted to the rod holder. The rear part of these tip rods is attached to a rock drilling machine directly or via a connecting rod, and a hole is drilled while giving rotation, striking and thrust. At the time of drilling, circular holes are drilled in rows at intervals by a plurality of lock bits at the tip, but a hard blade protruding forward is provided in the space between the rod and the rod of the rod holder. Since they are provided, these blades destroy the gaps between the circular holes punched by the bits, so that adjacent holes are continuous. As a result, continuous holes are drilled.

When drilling a subsequent continuous hole adjacent to the previously drilled continuous hole, a punching device in which a forward hard blade is also provided at the side end of the rod holder is used. It is sufficient to use a circular hole at the side end of the previously drilled continuous hole at a distance corresponding to the length of the crack.

Since the drilling device forms a gap portion which is not drilled by the bit between a plurality of circular holes which are drilled by the bit, a bit having a relatively small diameter can be used. Therefore, the impact energy of the rock drill can be effectively used, and the continuous holes can be efficiently formed.

[0011]

Embodiments of the present invention shown in the drawings will be described below.

FIG. 1 shows an embodiment of the present invention. This drilling device 1 comprises four tip rods 2, ..., One rod holder-3 and four lock bits 4 ,. Become.
The tip rod 2 has a thread portion 6 for mounting a bit formed at the tip portion thereof, and a large-diameter collar 7 integrally formed at the middle portion thereof. The front portion of the collar 7 is a base portion 8 having a slightly larger diameter. Further, a screw portion 9 screwed to a chuck sleeve of a rock drill or a coupling sleeve for relay is formed at the rear end portion of the tip rod 2, and a water hole that opens forward and backward is formed in the core portion. 10 is drilled. The water hole 10 is a side water hole 11 which is branched on the front side of the color and is opened obliquely forward to the front end side step portion 8a of the base portion 8. It should be noted that the screws of the screw portion 6 at the front end portion and the screw portion 9 at the rear end portion are in opposite directions by two left and right screws.

The rod holder-3 includes four cylinders 31, ...
Are integrally connected in a row by square plate-shaped connecting portions 32, ..., and a chisel-type carbide tip blade body 33 having a sharp tip is brazed to the front side of these connecting portions 32, respectively. The tip of the blade body projects forward from the end surface of the cylinder. A step portion 34 is formed inside the cylinder 31, and an inner diameter of the rear portion 35 is slightly larger. Further, wing portions 37 projecting laterally are integrally formed on the outer peripheral portions of the cylinders at both end portions of the rod holder-3, and a blade of a cemented carbide tip sharpened laterally and forwardly at the front end portion thereof. Body 39 is planted.

The lock bit 4 has a diameter such that a gap 40 is formed between adjacent lock bits. In the illustrated example, a button bit having button-shaped blades 41, ... Other known lock bits can be used, such as those with a type of blade.
The rear part of the lock bit 4 is a screw socket 4 for mounting.
It is 4. The screw of the screw socket 44 is screwed into the screw of the screw portion 6 of the rod to which it is attached, and the left and right screws are two in opposite directions.

As shown in FIGS. 4 and 5, the drilling device 1 is used by being mounted on a rock drill 53 fixed to a carriage 51 mounted on a guide cell 50 so as to be movable back and forth. The rock drill 53 comprises four sets of hitting devices 5 having hit pistons similar to those of a known rock drill.
, 5 are mounted in parallel on a common housing 56, and a chuck sleeve 57 is provided in each striking device. These chuck sleeves are rotatably driven in the left half and the right half in opposite directions or alternately in opposite directions by an attached rotating device 60.

The guide cell 50 is attached to a boom of a vehicle body (or a base) that supports the guide cell, and can be moved back and forth by a hydraulic cylinder 65. Further, the guide cell 50 has a hydraulic motor.
There is a well-known feeding device using
The carriage 51 is moved back and forth by this feeding device. A thrust force is applied to the punching device 1 by this feeding device. A guide device 71 that rotatably supports the connecting rods 70, ... Is provided at an intermediate portion of the guide cell 50, and a centralizer 72 that similarly similarly rotatably supports the rod is provided at a tip end portion of the guide cell 50. ing. Further, a fixing foot 75 protruding forward is attached to the tip of the guide cell 50.

The punching device 1 is used by inserting the tip rods 2, ... Into the rod holder 3 and attaching the lock bits 4 to the tip portions. In the illustrated example, the tip rod 2 is connected to the connecting rod 7 via the coupling sleeve 77.
0, and the connecting rods are screwed to the chuck sleeve 57 of the rock drilling machine 53, but when the tip rod 2 is sufficiently long, it is directly attached to the chuck sleeve and used. You can also do it.

In this state, the foot 7 at the tip of the guide cell is
5 is pressed against the rock mass, and the rock bits 4, ... Are pressed against the rock mass while operating the rock drill 53, the four circular holes H, ... Are simultaneously drilled at predetermined intervals by these four lock bits. . During this time, water or air supplied from the rock drill side through the water hole 10 of the rod is discharged from the ejection hole (not shown) of the rock bit, and the powder is discharged.

Further, water or air discharged from the branch water hole 11 of the rod holder-3 lubricates the fitting portion between the rod holder-3 and the tip rod to prevent foreign matter from entering. or,
After the drilling is started, until the rod holder 3 comes into contact with the bedrock, the pressing force of the air or water suppresses the longitudinal movement of the rod holder, so that the blanking phenomenon does not occur. When the drilling hole advances, the lock bit enters into the hole H, the blade body of the front end surface of the rod holder-3 is pressed against the rock mass, and the impact force and the thrust force transmitted through the color of the tip rod cause The circular holes and the space K between the holes are crushed, and the adjacent holes communicate with each other. As a result, the continuous hole S as shown in FIG. 6 is formed. Wedge-shaped cracks W are formed at both ends of the continuous hole S by the side blades 39, 39. When such a crack W is formed, when the next continuous hole is punched adjacent to the previously drilled continuous hole S, the end bit does not have to overlap the previously drilled hole. The continuous holes can be made continuous by the crack W. For this reason, the blanking of the bit at the end is prevented, and the life of the bit is not shortened.

During drilling, the tip rod 2 is rotated by a rotating device.
And bit 4 is rotated. Since this rotation direction is opposite for the left half L bit and the right half R bit,
The rotation forces are canceled out as a whole, and the whole is prevented from rotating in either direction.

In this drilling device, a plurality of circular holes are bored at intervals by a plurality of bits, and the intervals between these circular holes are crushed by another blade, so that even if the bit diameter is small. A relatively long continuous hole is obtained. Since the diameter of the bit can be reduced, drilling efficiency is also high. Furthermore, since each bit forms a circular hole without interfering with each other, abnormal wear of the screw portion due to the blanking effect is unlikely to occur. In the above description, an example in which four bits are used has been shown, but the number is not limited to four and may be two or more.

FIG. 7 shows an embodiment different from the above. In this embodiment, the bit (A) at the left and right ends is longer than the middle bit (B) by a length d (d is about 10 to 40 mm).
Only projects forward. This is because if the front end faces of all the bits are aligned as shown in FIG. 1, the left and right bits are likely to move inward in the drilling holes and force may be applied to cause damage. Instead of projecting the bits at both ends in this way, the bits may be alternately moved back and forth as shown in FIG.

[0023]

As is apparent from the above description, in the punching device according to the present invention, the forward facing blade of the rod holder is formed after the plurality of circular holes are punched by the lock bit in a row. Since the gap portion is crushed by the body to form a continuous hole, a relatively long continuous hole can be obtained even if the bit diameter is small. Since the diameter of the bit can be reduced, it is possible to increase the drilling speed. In addition, since the continuous holes are formed without overlapping the holes to be drilled with the bit, as in the conventional method, a plurality of preceding holes are formed at intervals, and the intervals are formed later. It is more economical than the drilling method, and the impact is not applied intermittently to the bit, so accidents such as early damage of the bit are less likely to occur.

[Brief description of drawings]

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

FIG. 2 is a front view of a bit holder.

FIG. 3 is a vertical sectional view thereof.

FIG. 4 is a plan view showing usage.

FIG. 5 is a side view thereof.

FIG. 6 is a front view of a continuous hole.

FIG. 7 is a plan view of an essential part of a different embodiment.

FIG. 8 is a front view of a hole array formed by a conventional drilling method.

FIG. 9 is an explanatory diagram of still another embodiment.

[Explanation of symbols]

 1 Drilling device 2 Tip rod 3 Rod holder-4 Lock bit 7 Color H hole S Continuous hole

Front page continued (72) Inventor Naoyoshi Akiyoshi 26-5 Ikeda Nishimachi, Neyagawa City, Osaka Prefecture Toho Metal Co., Ltd. Neyagawa Plant (72) Inventor Seiji Kunitake 26-5 Ikeda Nishimachi, Neyagawa City, Osaka Prefecture Toyo Metal Co., Ltd. Neyagawa Plant (72) Inoue Takayuki Inoue 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi Okumura-gumi, a stock company (72) Inventor Tadashi Masumoto 2--22 Matsuzaki-cho, Abeno-ku, Osaka-shi Okumura-gumi (72) ) Inventor Susumu Murakami 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka City Okumura Gumi, a stock company (72) Inventor Yoshio Ehara 282 Nakagurisu, Fujioka, Gunma Prefecture 1

Claims (3)

[Claims] 1. A plurality of tip rods each having a lock bit mounting portion at a tip end thereof and a large diameter collar extending in a diametrical direction at an intermediate portion, and attached to the tip end portions of the tip rods, respectively. Lock bit and a plurality of fitting holes into which the plurality of tip rods are respectively fitted are provided in a row with a space therebetween, and the plurality of fitting holes project toward the tip side in the gap portion. A drilling device comprising a rod holder to which a hard blade is fixed. 2. The punching device according to claim 1, wherein a hard blade protruding toward the tip side is fixed to one side end portion or both side end portions of the rod holder. 3. A plurality of tip rods each having a lock bit mounting portion at a tip end thereof and a large diameter collar extending in a diametrical direction at an intermediate portion, and attached to the tip end portions of the tip rods, respectively. A lock bit and a plurality of fitting holes into which the plurality of tip rods are respectively fitted, are provided in a row at intervals, and the space between the plurality of fitting holes and at least one side end portion are provided. After drilling a continuous hole using a drilling device comprising a rod holder to which a hard blade protruding toward the tip side is fixed, when drilling a continuous hole adjacent to the continuous hole, Without overlapping the bit at the side end of the subsequent continuous hole with the hole at the side end of the preceding continuous hole,
A continuous hole drilling method, characterized in that a continuous hole is drilled at a position where the continuous holes are continuous by a crack formed by a hard blade at a side end portion of a rod holder.