JPS598893A - Drilling 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 a drilling method used for drilling large diameter holes in rock.

Pole-erecting trucks equipped with an auger-type drilling device are widely used to erect utility poles, but with the auger-type drilling device, it is extremely difficult to drill large-diameter holes in hard rock. there were.

The present invention provides a drilling method that can successfully drill pillar holes even in hard rock, and this will be explained below.

The drilling method according to the present invention forms a ring-shaped row of small holes by continuously drilling a plurality of small holes adjacent to each other along the circumference of a desired large diameter hole; A cylindrical bit having an annular cutting edge with an overlapping diameter is used to cut out the barrier remaining between adjacent small holes in the row of small holes, and then the core remaining in the core is removed. There is. That is, in the present invention, first, a plurality of small holes are circularly bored in a rock, and a drilling device such as that illustrated in FIGS. 1 and 2 is used for this purpose. The illustrated drilling device includes a support 101, a guide cell 11, a rock drill 12, and a pneumatic cylinder 13, which is a feeding device for the rock drill. The support column 10 is formed as a square bar with a chamfered ridgeline, and is fitted into a chuck 19 of a square cylindrical fixture 18 having a protrusion rod 14 with a sharp tip at its lower end, and is fixed by a pin 2o. . The upper end of the column rotation device 18 is
It is connected by a hydraulic printer (not shown) to the boom 21 of the digging pole erecting vehicle, which rotates up and down, and is pressed in one direction by the boom 21. Thereby, it is supported in a state where it is erected on the pillar 10 or the bedrock 22. The boom 21 is used as a supporting device for the support column.

It is something that works. The column 10 may be supported in other ways, or the column may be rotated manually.

The kite cell 11 is attached to the column 10 via a cell attachment tool 23 and a cell attachment bracket 24. A guide groove 1 formed in the center of this guide cell 11
], A carriage 35 is slidably attached to the portion C. An ear-shaped attachment piece 35a is provided on the surface of the carriage 35, and the rock-cutting piece 12 is attached to this. In addition, a connector 3 is provided on the back side of the carriage 35.
6 are provided, to which a pneumatic cylinder (rodless printer) 13 is attached.

When using this drilling device, the tip and end of the push rod 14 provided at the lower end of the column 10 are brought into contact with the Y; board, and the column is supported by a column support device in an erect state. In this case, it is preferable to provide a rough counterbore in the portion that the thrust rod 14 comes into contact with.

In this state, the drilling rod 34 with the lock hit 41 accommodated at its tip is fitted into the drilling rock 12, and drilling work is carried out while supplying compressed air to the drilling rock 2 and the pneumatic cylinder 13. Of the air hoses shown, 42
The air hose is for operating the Iwatsuki for drilling, 4:3 is for blowing, 44 is for advancing the Iwatsuki for drilling, and 45 is for reversing the front bar.

FIG. 3 shows a method of forming a row of small holes, and as shown in this figure, a large number of small holes 3 are arranged adjacent to each other along the circumference 2 of a desired large diameter hole 1. The holes are continuously drilled to form an annular row of small holes 4.

These small holes 3 are drilled by the rock drill of the drilling device, or in the case of drilling a plurality of holes adjacent to each other in this way, the rock hit is drilled first during the operation. There is a risk that the hole may escape to the adjacent hole and prevent the formation of a normal hole.
It is preferable to drill holes.

First, a small hole a and a small r1-] are drilled at an interval of one small hole, and a small hole A small hole C is drilled in the portion sandwiched between the small holes -L by inserting a soft metal rod 5 having an outer diameter close to the inner diameter of the metal rod. Nisruto like this,
Since the lock hit is inserted into both holes and advances along both metal rods 5 while touching the metal rod 5, a small hole with a straight page is formed. Once the small hole C has been drilled, remove the metal rod 5 and proceed in the following order (l cr g h i...
It is best to drill holes by repeating the same operations as above. The length of the metal rod 5 is 10 to 2 when there are 1111 people in the small hole.
It is sufficient that the length is such that it protrudes above the ground by about C1n, and it is preferable to have a hook on the head so that wire robes, etc. can be pulled out when removing it.

A large diameter hole with an inner diameter of about 250 to 500 nm is often used as a hole for building a pillar, but for example, if the inner diameter of the large diameter hole 1 is 45 Q ITIn, it may be used for drilling a small hole. The diameter of the rock tip depends on the performance of the rock drill, or it should be between 6 and 40 + rnn culm degree. Further, the diameter of the kite river rod 5 is preferably 4 to 51 TITI smaller than the diameter of the lock hit. For example, if the diameter of the lock hit is 3611110 (4 outer diameter: 32 ITlln), it is preferable to use a rod. In addition, when drilling a small hole using the above-mentioned drilling device, once one small hole is drilled, the support rotation device 18 is operated to rotate the support 1o by a predetermined distance, and the next small hole is drilled. By rotating the support 10, the axis of the drilling rod 34 moves around the same circumference, so that the same radius around the support 10 is moved. This allows multiple small holes to be drilled one after the other around the circumference.

In this way, an annular row of small holes 1 is formed at 17, or the rows of small holes 3 adjacent to each other in this row of holes do not communicate with each other very much, and depending on the perforation line p+, As shown in Figure 4, there is a rock or barrier part 3a between the small holes 3 and 3.
It often remains as such.

For this reason, the front pillar (core) 6 inside the row of small holes 4 is not completely isolated, which tends to make the subsequent core removal work difficult. In order to prevent this, after forming the above-mentioned small hole array, as shown in Fig. 5(a).
, (1)) The core 6 is isolated (edged) using a cylindrical hit 50 as exemplified in (1)).

゛ The cylindrical hitch 50 has an annular cutting edge 52 formed by implanting a plurality of carbide tips 51 at its tip, an IJ cutting ring 53, and the cutting link 53 is screwed (S). A bit body 54 is provided, and a take-up shaft 55 is integrally provided at the rear end of the bit body 54. Cylindrical bit 50
can be attached to the -1- output shaft 58 by fitting the mounting shaft 55 into a cylindrical joint 56 attached to the output shaft 58 of the rotating device and fixing it with a port 57.

The pillar 10 of the drilling device and the output shaft 58 include:
It is convenient to use the commonly used auger shaft made by Kenbashira, Anahori. In this case, the output shaft 58 is rotated by an auger rotation motor (hydraulic motor 16 in the illustrated example). The outer diameter of the cylindrical body 50 is 1) or 460ryy.
n, inner diameter I) 2 or 43 Q nyn , then
For example, the carbide tip 51 of the cutting edge portion 52 is 8X I.
It is preferable to implant about 24 square chips of Q x ]2 (mn) at equal intervals by soldering. At this time, the carbide tip 51 is tilted and soldered so that one ridgeline protrudes by about 2111111 degrees.

Figure 6 (a), (+) 1 year old cylindrical hiso) 5
0, press it so that it fits over the small hole row j, apply rotation and thrust to the j-shaped cylindrical hit 50 via the output shaft 58, and press the small hole row. The barrier portion 3a remaining between the hole and the small hole is cut away. During this operation, the air tube 59 is inserted 17 into the small hole 3 to discharge compressed air into the small hole row. It is important that the cylindrical bit 50 be held parallel to the drilling direction of the small hole 3. It should be noted that the cylindrical hole may be of a shape such as that used in IS et al., which can effectively cut the rock between the small holes.

The core 6 thus isolated is crushed and removed by an appropriate method. In the core crushing method, for example, one or two pilot holes 7 are bored in the center of the core 6, and an inorganic compound mainly composed of silicate or an inorganic compound mainly composed of silicate is poured into the pilot hole 7. It is possible to adopt a method in which a slow crushing agent (for example, a commercial fly star) is filled and the core is crushed by the expansion LL. In addition, after inserting a pair of suppressing pieces of a hydraulic stone splitter into the prepared hole 7, a wedge rod is placed in the space between the two suppressing pieces and the suppressing pieces are pushed open, thereby crushing the core. It's okay. In some cases, the core may be crushed using a breaker such as a hydraulic breaker, which is normally used for crushing rocks, without drilling the subordinate hole 7. Even in this case, it is more effective to drill the pilot hole 7 in advance.

In this way, the desired canine diameter is obtained.

The drilling method according to the present invention forms a row of small holes in a rock, then removes the rock barrier portion remaining in the row of small holes, and removes the isolated core to obtain a desired large-diameter hole. However, it has become possible to efficiently drill large-diameter holes for pillar erection even in hard rock.

[Brief explanation of drawings]

Figures 1 and 2 are a front view and a side view of the drilling device, Figures 3 and 4 are plan views of the row of small holes, and Figure 6 (
) and (1)) are a side sectional view and a bottom view of the cylindrical human body in its used state. 1...Dog [I diameter hole 3...Small hole 4・Small hole row 5・
・Metal body 6・Core IO...Strut 12...
・Drilling Iwatsuki 3.1...Drilling Rondo 5o...Cylindrical Hit 51...Carbide Tip Special Il Applicant Yamaki Tetsu Co., Ltd. Agent Patent Attorney Hiroshi Sugawara

Claims (1)

[Claims] (1) A drilling method for drilling a large diameter hole in bedrock,
A plurality of adjacent small holes are continuously drilled along the circumference of the desired large diameter hole to form an annular row of small holes, and an annular cutting edge portion having a diameter that overlaps with the row of small holes is formed. A drilling method characterized by using a cylindrical bit to cut out the barrier portion remaining between adjacent small holes in a row of small holes, and then removing the core remaining in the core portion.