JP2966269B2 - Notch forming method for blast holes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for crushing residual iron, rock, concrete, etc. in a blast furnace by a blasting method.
Notch for generating cracks in pigs, rocks, etc.
The present invention relates to a method for forming a notch over the entire length .

[0002]

2. Description of the Related Art Conventionally, in order to crush residual iron and rocks in a blast furnace, blast holes having a predetermined depth are formed at appropriate intervals in portions to be crushed, and explosives are charged in these blast holes. A blasting method has been adopted in which blasting is performed to cause cracks in each direction from each blast hole. Furthermore, in such a blasting method, the direction of the crack from the blasting hole is uncertain and efficient crushing cannot be expected. Therefore, when drilling the blasting hole with a piercing rod, a notch-forming blade is projected on the outer peripheral surface. In some cases, a notch is formed in the hole wall by the blade body at the same time as drilling, and stress concentration is generated in the notch portion at the time of blasting to determine a crack direction by using a piercing rod provided. .

[0003]

However, when a rock is pierced by a piercing rod, for example, the hole wall excavated by the rod tip bit has an uneven surface. Even if a notch can be cut into the convex surface of the hole wall by the blade body that enters in the direction, a notch can not be formed on the concave surface, and the correction can not be done, so the notch is in the length direction of the blast hole. However, there is a problem in that the cracks are formed discontinuously and the depth thereof is also not uniform, so that it is impossible to form a crack with high accuracy. An object of the present invention is to provide a method for forming a blast hole notch that can completely solve such a problem.

[0004]

To achieve the above object, according to the Invention The notch formation method of the present invention, of the actuating member with connecting the pair of actuating member which is arranged freely drawn so pore diameter direction to the tip Insert a pipe body with a notch forming bit protruding from the portion facing the blast hole wall into the blast hole to
After positioning the pair of actuating members in the deepest part of the blast hole,
The projecting direction of the bit protruding from these operating members
Place the pair of operating members in the hole diameter direction
The above bit on the hole wall of the blast hole
In this state, the operating member is always on the hole wall side.
By pulling out the pipe body from the blast hole while pressing
Notch continuous in a straight line over the entire length of the hole wall of the blast hole
Is formed .

In the method for forming a notch in a blasting hole , as an example of a specific structure for expanding and contracting a pair of operating members in a hole radial direction, as described in claims 2 to 5, a plurality of operating members are arranged side by side. The members can be moved in the direction in which the opposing surfaces come into contact with or separated from each other by a pivot or a thin flexible portion, and a wedge body is inserted between the opposing surfaces of these operating members, or the jack is forcibly expanded and contracted in the hole diameter direction by a jack. I try to let. In addition, as described in claim 6 and claim 7, the notch forming bit has a blade portion formed on the outer peripheral edge even if the rod is provided with a notch forming blade at the tip. It may be a roller bit.

[0006]

After the blast hole is drilled in the rock or the like, the operating member attached to the tip of the pipe body is inserted into the deepest part of the blast hole, and the pushing mechanism such as a wedge or jack is operated. The pair of operating members are forcibly expanded in the hole diameter direction. Due to this expansion, the notch forming bit protruding from the operating member bites into the hole wall of the blast hole, and a part of the hole wall is cut into a predetermined depth from the wall surface, that is, a notch is formed. When the pipe is pulled out from the blast hole while forcibly pushing and expanding the operating member toward the hole wall in this way, a pair of operating members along the hole wall with the bit cut into the hole wall. It recedes and a notch is formed in a part of the hole wall, which is continuous in the length direction.

At this time, the surface of the hole has an uneven surface.
Since the operating member is constantly pressed in the direction of the hole wall, when the bit reaches the concave portion, the bit is forcibly cut into the concave portion to form a notch of a predetermined depth on the wall surface. Therefore, the notch can be formed in a continuous straight line over the entire length of the hole wall.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
1 and 2, reference numeral 1 denotes a pipe body having a diameter that can be inserted into the blast hole A, and a base end of the cylinder body 2 is integrally connected to and fixed to a distal end of the pipe by screwing or the like. A pair of left and right arms 3, 3 protrude from both sides of the distal end surface of the cylinder body 2, and a pair of operating members 4, 4 vertically arranged between the arms 3, 3 are arranged in the hole diameter direction of the blast hole A. It is arranged to be able to expand and contract.

As the expansion and contraction structure of the operating members 4, 4, in the drawing, bracket portions 4a which are superposed on each other are protruded from the opposing surfaces of the operating members 4, 4, and these bracket portions 4a are connected to each other. By rotatably pivoting by the shaft 5, the base ends of the operating members 4, 4 are configured to expand and contract in the hole radial direction. 6
Is a bar-shaped notch forming bit protruding toward the hole wall of the blast hole A at the base end of the operating members 4 and 4, and the rear side of the protruding portion is formed into an inverted V-shaped blade body 6 a. It is.

The bit 6 has its base buried in the operating member 4 and is fixed in such a manner that a blade 6a of a fixed length is protruded from the operating member 4. At the time of insertion into the blast hole A, it is moved down to the operation member 4 side to facilitate its insertion, while at the time of notch formation, it is automatically erected by sliding contact with the hole wall and protruded from the operation member 4. Alternatively, it may be configured to cut into the hole wall.

Reference numeral 7 denotes a piston which is slidably housed in the cylinder body 2 and has a rod protruding forward from the tip of the cylinder body 2 and gradually projecting its protruding end toward the tip. The wedge body 8 is formed to be tapered, and the wedge body 8 is interposed between the base opposing surfaces of the pair of operating members 4 and 4. Rollers 9, 9 are rotatably mounted on the base ends of the opposing surfaces of the operating members 4, 4, and the tapered surfaces of the wedges 8 are brought into contact with these rollers 9, 9, to thereby remove the wedges 8. By moving forward, the operating members 4 and 4 are forcibly expanded and moved toward the hole wall. The rollers 9, 9 reduce the frictional resistance with the wedge body 8, and
4 is provided in order to expand smoothly.
The wedge body 8 may be directly in sliding contact with the opposing surfaces of the operating members 4 and 4. A pressure fluid supply hose 10 is connected to and communicates with the bottom side of the cylinder body 2 and is connected to an external pressure fluid supply source (not shown) through the pipe body 2.

In order to form a notch D over the entire length of a hole wall C of a blast hole A drilled in a bedrock B using the notch forming apparatus of the embodiment configured as described above, first, a cylinder is required. The inside of the body 2 is depressurized and the pipe body 1 is blasted A
As shown in FIG. 3, the operation members 4, 4 provided on the front end side of the inside are inserted until they reach the bottom of the hole. At this time, the operating members 4 and 4 are in sliding contact with the hole walls. However, since the pressure in the cylinder body 2 is reduced, the operating members 4 and 4 are moved inward about the shaft 5 while retracting the wedge body 8. Rotate to reduce the width between the outer surfaces to allow for smooth insertion.

When the operating members 4 reach the bottom of the hole, compressed air is introduced into the cylinder body 2 with the projecting direction of the bits 6 protruding from these operating members 4 oriented in the direction in which cracks are planned to occur. Alternatively, a pressurized fluid such as pressurized oil is supplied. The supply of the pressurized fluid causes the wedge body 8 to move forward and push the operating members 4 and 4 apart from each other via the rollers 9 and 9 to bite the bits 6 and 6 into the hole wall C.

In this state, the pipe 1 is gradually pulled out from the blast hole A while the operating members 4 and 4 are constantly pressed by the wedge body 8 in a direction of pressing against the surface of the hole wall C. The outer surface of the hole recedes integrally with the pipe body 1 along the hole wall C, and a notch D having a V-shaped cross section is formed in the hole wall C while maintaining the bit 6 biting into the hole wall C to a certain depth. When the operating members 4 and 4 are pulled out from the blast hole A, notches D and D that are linearly continuous over the entire length of the hole wall C can be engraved as shown in FIG.

At this time, the hole wall C of the blast hole A has an uneven surface at the time of piercing, but the operating members 4, 4 are constantly pressed against the hole wall C via the wedge body 8 by the fluid pressure. Therefore, when the bit 6 reaches the concave portion, the bit 6 is pressed toward the concave portion so that the notch D can be surely formed. Further, in the case of hard rock or the like, when the notch D is shallow in a single cut by the bit 6 or when it is desired to form a continuous notch D of a predetermined depth without fail, the operating members 4 and 4 are again turned on. May be inserted into the blast hole A and the notch D may be cut deeper while removing the pipe body 1 in the same manner as described above with the bit 6 pressed against the notch D.

In the above embodiment, the operating member 4 is provided with the rod-shaped bit 6 so as to protrude. However, as shown in FIGS. 6A
May be rotatably pivoted, and the notch D may be cut and formed by the outer peripheral edge portion of the roller bit 6A protruding outward from the outer surface of the operating member 4.

FIGS. 7 and 8 show still another embodiment of the present invention. In the above embodiment, a pair of upper and lower operating members 4 and 4 are protruded from the cylinder body 2 and are turned around the arms 3 and 3. In this embodiment, the base members of the upper and lower operating members 4A, 4A are directly fitted to and integrated with the distal end of the pipe body 1 in a state of being juxtaposed. Element
4A, a thin flexible portion 12 is provided by forming a concave portion 11 on the inner and outer surfaces at an intermediate portion in the longitudinal direction of the 4A,
By bending the 12, the distal ends of the operating members 4A, 4A are configured to expand and contract in the hole wall direction. Further, roller bits 6A, 6A having outer peripheral blade portions protruding outward are rotatably connected to the distal ends of the operating members 4A, 4A.

Further, tapered grooves 13 having a semicircular cross section whose diameter is increased outward and inclined from the inner concave portion 11 toward the tip are engraved on the opposing surfaces of the operating members 4A, 4A. , 13 between which a tapered cylindrical wedge body 8a gradually increasing in diameter toward the distal end is interposed, and the base end of the wedge body 8a is formed into a rod part 8b of the same diameter to form the rod part 8b. Are inserted into the semicircular guide grooves 14 formed on the base member opposing surfaces of the operating members 4A, 4A, and protrude into the pipe body 1.

The operation mechanism of the wedge body 8a may be performed by the fluid pressure as described in the above embodiment, but in the figure, a screw portion 8c formed on the rod portion 8b of the wedge body 8a is used. A rod 16 screwed to a cap nut 15 disposed in the pipe body 1 and protruding in the axial direction from the base end face of the cap nut 15 is connected to an end face plate closing the opening base end of the pipe body 1.
A nut 18 is screwed into a threaded portion 17 formed at the end of the rod 16 so that the nut 18 is brought into contact with the end face plate 17 and received.

With such a structure, the operating members 4A, 4A
When the nut body 18 is rotated in the direction in which the rod portion 8b of the wedge body 8a is retracted after the pipe body 1 is inserted until the pipe body 1 reaches the bottom of the blast hole A, a pair of upper and lower operations is performed by the retraction of the wedge body 8a. The members 4A, 4A expand toward the hole wall C in a direction away from the flexible portions 12, 12, and the roller bits 6A, 6A bite into the hole wall C. In this state, a notch D having a predetermined depth is formed in the hole wall C by the roller bits 6A, 6A while pulling out the pipe body 1 from the blast hole A in the same manner as in the above embodiment.

In each of the above embodiments, the pair of operating members are configured to be expanded and contracted by the action of a wedge. However, as shown in FIG. And the jack 20 may be configured to expand and contract inward and outward by the operation of the jack 20.

[0022]

As described above, according to the notch forming method of the present invention, a pair of operating members arranged side by side at the tip so as to be able to expand and contract in the radial direction of the hole are connected and opposed to the blast hole wall of the operating member. Pipe with a notch forming bit protruding at the part
Insert the body into the blast hole and connect the pair of operating members to the blast hole.
After being located at the deepest point,
Direction of the above bit in the direction of the crack initiation plan.
By expanding the pair of operating members in the hole diameter direction,
Bit into the hole wall of the blast hole.
And push the operating member toward the hole wall side
The entire length of the hole wall of the blast hole
Is to form a continuous notch on a straight line
At the deepest part of the blast hole, the bit can be forcibly cut into the hole wall via the operating member to form a notch of a desired depth, and the bit can be cut into the pie.
The actuating member along the hole wall without rotating the
By retracting in the length direction and pulling out while moving , even if there is some uneven surface on the hole wall,
It is possible to reliably engrave notches that are continuous on a straight line over the entirety.

Further, after the notch is formed, the operating member is inserted again into the blast hole so that the notch can be formed more securely and deeply, and another notch pointing in a desired direction to a hole wall portion different from the notch can be easily formed. It can be formed as follows.

Further, even if the blast holes have different hole diameters, not only can the bit be cut into the hole walls by expanding and contracting the pair of operating members according to the diameters,
The notch can be formed by directing the bit in the direction in which a crack is desired to occur at the time of blasting, and therefore, the blasting efficiency can be improved, and the amount of charge is reduced along with the number of blasting holes. This enables efficient and efficient crushing work.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal side view of a notch forming apparatus,

FIG. 2 is a plan view thereof,

FIG. 3 is a simplified side view of a state inserted into a blast hole,

FIG. 4 is an enlarged front view of a blast hole having a notch;

FIG. 5 is a partially longitudinal side view of a notch forming apparatus provided with a roller bit;

FIG. 6 is a plan view of the operating member,

FIG. 7 is a vertical sectional side view of another notch forming apparatus of the present invention;

FIG. 8 is a plan view thereof,

FIG. 9 is a side view of an operating member of a notch forming device provided with a jack expanding / contracting mechanism.

[Explanation of symbols]

 Reference Signs List 1 pipe body 4 operating member 6 bit 8 wedge body A blast hole D notch

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Idezaki 3434 Shimada, Hikari-shi, Yamaguchi Prefecture Nippon Steel Corporation Hikari Works (72) Inventor Mitsuhiro Muneda 2-2-2 Matsuzakicho, Abeno-ku, Osaka-shi No.2 Okumura Gumi Co., Ltd. (72) Inventor Tatsuhiro Furonaga 2-2-2 Matsuzakicho, Abeno-ku, Osaka-shi Okumura Gumiuchi (72) Inventor Yoshihiko Endo 2-2-2 Matsuzakicho, Abeno-ku, Osaka-shi Okumura Gumi Co., Ltd. (72) Inventor Yoshio Iwata 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi Okumura Gumi Co., Ltd. (56) References JP-A-60-15108 (JP, A) Japanese Utility Model Application Sho-59-73487 ( JP, U) Japanese Utility Model Showa 54-102502 (JP, U) Japanese Utility Model Showa 58-38890 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21C 37/02 E21B 10/32 C21B 7/00 304

Claims (7)

(57) [Claims] 1. A notch forming bit is protruded from a portion of a front end of a pair of actuating members which are arranged side by side so as to be freely expandable and contractible in a hole diameter direction and opposing a blast hole wall of the actuating member. Become
Insert the pipe into the blast hole to fire the pair of operating members.
After being located in the deepest part of the breach,
The projecting direction of the projecting bit is determined by
The pair of operating members in the hole diameter direction.
This causes the bit to bite into the hole wall of the blast hole,
State while always pressing the operating member against the hole wall side.
The entire wall of the blast hole is pulled out of the blast hole.
A notch forming method for a blast hole, comprising forming a continuous notch on a straight line over a long length . 2. The apparatus according to claim 1, wherein the pair of operating members are rotatably connected by pivots between the distal ends thereof so as to expand and contract in the radial direction of the hole around the axis.
A method for forming a notch in a blast hole according to the above. 3. A pair of operating members having a thin flexible portion formed at an intermediate portion in a longitudinal direction thereof, and configured so that a bit mounting portion is expanded and contracted in a hole radial direction by bending of the flexible portion. 2. The method for forming a notch in a blast hole according to claim 1, wherein 4. A method for forming a notch in a blasting hole according to claim 1, wherein the mechanism for expanding and contracting the pair of operating members in the hole radial direction comprises a wedge inserted between opposing surfaces of the operating members.
Law . 5. A method for forming a notch in a blasting hole according to claim 1, wherein the mechanism for expanding and contracting the pair of operating members in the hole radial direction comprises a jack interposed and connected between opposing surfaces of the operating members. . 6. The notch forming bit is a rod-shaped body having a notch forming blade at a tip.
A method for forming a notch in a blast hole according to the above. 7. The method for forming a notch in a blast hole according to claim 1, wherein the notch forming bit is a roller bit having a blade portion formed on an outer peripheral edge.