JPH07301085A - Perforator - Google Patents

Abstract

PURPOSE:To perforate at a peripheral edge of a cutting face in parallel to a peripheral wall eliminate the need to perforate with an insertion angle so as to excavate a specified cross section of the cutting face, minimize overbreak, reduce the amount of explosives and the amount of blasted rocks to be brought out and the amount of concrete which lines the peripheral wall and thereby to enhance work efficiency and reduce excavation cost as well. CONSTITUTION:A down the hole drill D, whose outside diameter is adapted to be less than a bit diameter (d) and, which is provided with each of piping connection sockets 18, 19 and 20 or accessories, such as rotary motors 23 in the rear end, is installed to a carriage 10 loaded on a guide shell 3 movably back and forth in such a fashion that the accessories may be located on the side of the carriage 10, thereby eliminating such portions which are higher than the bit 16 on the guide shell 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perforator capable of perforating a peripheral edge of a face such as a tunnel in parallel with a peripheral wall.

[0002]

2. Description of the Related Art Generally, when excavating an underground space such as a tunnel, a tunnel, an underground tank, etc. in rock, a blast hole is bored in a face, an explosive is loaded and blasting is performed to crush the rock to proceed. As shown in FIG. 6, in the punching of such a blast hole, a guide shell 3 is tiltably and swingably supported on the tip end of a boom 2 provided on the carriage 1 so as to be able to turn up and down. A punching device is used in which a punching machine 4 having a striking mechanism and a rotating mechanism is mounted so as to be able to move forward and backward.
A rod 5 is attached to the punching machine 4, and a bit 6 is attached to the tip of the rod 5.
The impact and the rotation are transmitted to the bit 6 through the, and the face 7 is perforated.

However, in the conventional punching device, the height Hd on the guide shell 3 of the punching machine 4 having the striking mechanism and the rotating mechanism is higher than the height Hb of the bit 6,
The peripheral edge 8 of the face 7 cannot be perforated parallel to the peripheral wall 9. Therefore, in order to secure the predetermined cross section of the cutting face and perform the excavation, it is necessary to perforate the cutting face 7 with the insertion angle θ from the inner side to the outer side, which causes overdrilling.
There is a problem that the amount of explosive used, the amount of crushed rocks carried out, and the amount of concrete lining the peripheral wall 9 increase, resulting in poor work efficiency and high excavation cost.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problems in a punching machine. Thus, the present invention, it is possible to perforate the peripheral edge of the face in parallel with the peripheral wall, it is not necessary to perforate at a corner to excavate a predetermined face section, it is possible to reduce excess digging, An object of the present invention is to provide a drilling machine capable of reducing the amount of explosives used, the amount of crushed rocks carried out and the amount of concrete lining the peripheral wall to improve work efficiency and reduce excavation costs.

[0005]

In order to solve the above problems, the present invention provides a carriage mounted on a guide shell so as to be able to move forward and backward, with an outer diameter of a bit diameter or less and an attachment portion at a rear end portion. The down-the-hole drill is installed so that the accessory part is on the carriage side to form a drilling machine.

[0006]

[Operation] Since the outside diameter is less than or equal to the bit diameter, and the down-the-hole drill with the attached part at the rear end is installed on the carriage so that the attached part is on the carriage side, the drilling machine uses the bit on the guide shell. There is no part that is higher than the height of the face, and the periphery of the face can be drilled parallel to the peripheral wall.

[0007]

1 is a side view showing the overall construction of a punching machine according to an embodiment of the present invention. In the present embodiment, a guide shell 3 is supported at the tip of a boom 2 provided on the carriage 1 so as to be able to swing up and down, and a guide shell 3 is supported so as to be tiltable and swingable. It has become. A hydraulically driven down-the-hole drill D is installed on the carriage 10. In the down the hole drill D, a swivel portion 12, a rod 13 and a striking portion 14 are connected to the front from a rotating portion 11 at the rear end, and a bit 16 is attached to the front end of a shank rod 15 inserted into the striking portion 14. The front end of the down the hole drill D is supported by a centralizer 17 provided at the front end of the guide shell 3.

In the down-the-hole drill D, since the striking portion 14 is provided in the vicinity of the bit 16 and is inserted into the drill hole, the outer diameter as a whole is less than or equal to the bit diameter d and is provided in the swivel portion 12. High pressure line connection port 18,
Low pressure line connection port 19, flushing fluid connection port 20,
Attachment parts such as the rotation motor 21 and the transmission part 22 of the rotating part 11 which come out of the cross section of the bit 16 are arranged at the rear end part, and these are installed on the carriage 10 so that they are all on the carriage 10 side. ing.

During the boring operation, the impact portion 14 driven by the pressure oil supplied from the high-pressure conduit connection port 18 of the swivel portion 12 through the inside of the rod 13 to the bit 16 via the shank rod 15. Is transmitted to the rocks of the face 7 through the transmission motor 22, the swivel portion 12, the rod 13, the striking portion 14, and the shank rod 15 from the rotation motor 21, and the rotation is transmitted to the bit 16. The striking portion 14 is provided in the vicinity of the bit 16, and the striking is effectively transmitted to the bit 16, so that it is possible to efficiently punch even if the bit diameter d is large.

The outer diameter of the down-the-hole drill D is less than or equal to the bit diameter d, and the high-pressure conduit connection port 18, the low-pressure conduit connection port 19, the flushing fluid conduit connection port 20 provided in the swivel part 12 and the rotating part 11 are provided. The rotating motor 21, the transmission portion 22, etc. of the bit 16 which are out of the cross section of the bit 16 are arranged at the rear end portion, and all of them are on the carriage 10 side. There is no portion above the height of the bit 16 on the shell 3, and the peripheral edge 8 of the face 7 can be drilled parallel to the peripheral wall 9.

Therefore, it is not necessary to make a hole with a bevel in order to excavate a predetermined face section, and the amount of explosive used, the amount of expelled crushed rock, and the peripheral wall 9 are lined with less overdrilling. It is possible to reduce the amount of concrete, improve work efficiency, and reduce excavation costs. 2 is a side view of a punching machine which is another embodiment of the present invention, FIG. 3 is a plan view of the punching machine, FIG. 4 is a front view of the punching machine, and FIG. 5 is A-A of FIG.
It is a line sectional view.

In this embodiment, similarly to the embodiment shown in FIG. 1, the swivel portion 12 and the rod 1 are moved forward from the rotary portion 11 at the rear end.
3, the hitting portion 14 is connected, and four down-the-hole drills D each having a bit 16 attached to the front end of the shank rod 15 inserted into the hitting portion 14 are installed in parallel in the carriage 10. Adjacent bits 16 are arranged so as to be displaced back and forth with respect to each other, an interval p at the center of the down-the-hole drill D is smaller than a bit diameter d, and the shank rod 15 is a rod in which an insertion hole 24 is provided at this interval p. Guide 25
The space is maintained by being inserted into. In the punching machine of the present embodiment, the arrangement of the bit 16 makes it possible to punch holes continuous in the lateral direction.

Therefore, it is possible to form a continuous hole in the peripheral edge 8 of the cutting face 7 in parallel with the peripheral wall 9, and if a continuous slit is formed in the peripheral edge 8 of the cutting face 7, excavation by low explosive blasting or non-blasting can be performed. It becomes possible, and efficient excavation can be performed even at sites where blasting is limited due to environmental measures.

[0014]

As described above, the perforator of the present invention can perforate a peripheral edge of a face in parallel with a peripheral wall, and it is necessary to perforate a face with a sharp angle in order to excavate a predetermined face section. Therefore, it is possible to reduce the amount of explosives used, the amount of explosives to be carried out, the amount of crushed rocks to be delivered, and the amount of concrete for lining the peripheral wall to improve work efficiency and reduce excavation costs.

[Brief description of drawings]

FIG. 1 is a side view showing an overall configuration of a punching machine which is an embodiment of the present invention.

FIG. 2 is a side view of a punching machine according to another embodiment of the present invention.

FIG. 3 is a plan view of a punching machine.

FIG. 4 is a front view of a punching machine.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a side view showing the overall configuration of a conventional punching machine.

[Explanation of symbols]

 1 bogie 2 boom 3 guide shell 7 face 8 peripheral edge 9 peripheral wall 10 carriage 11 rotating part 12 swivel part 13 rod 14 striking part 15 shank rod 16 bit 21 rotating motor 22 transmission part 23 feed motor D down the hole drill d bit diameter

Claims (1)

[Claims] 1. A down-the-hole drill having an outer diameter less than or equal to a bit diameter and an attachment portion disposed at a rear end portion is installed on a carriage mounted on a guide shell so that the attachment portion is on the carriage side. Drilling machine.