JPH07167599A - Envelop for blasting - Google Patents

Abstract

PURPOSE:To provide a blasting envelop which is arranged to load explosive easily, and definitely when blasting rocks or the like which must be blasted based on a blasting method. CONSTITUTION:This invention relates to an envelope which is inserted into a blasting hole which is oval in cross section and bored on a rock or the like which must be blasted. An envelop main body 1 is made of a soft sheet material and provided with an approximately similar length and cross section to those of the blasting hole 11. The evelop is so shaped that the outer peripheral surface of the envelop may by placed into cross contact with the blasting hole 2. At the same time, a rigid rod-shaped core material 4 is integrally fixed with proper peripheral surfaces over the length. An explosive is loaded into the front end of the envelop main body 1 from a loading aperture 3 installed to the rear end face of the envelop main body 1 in such a fashion that it may be opened freely. Then, the envelop main body 1, while it is contracted in the width direction or transversely, is inserted into the blasting hole by operating the core material 4. Then, liquid is injected into the envelop main body 1 and filled up and expanded as well. After that, the explosive is exploded, thereby concentrating a blasting force in the shorter direction of the blasting hole and generating cracks in the longer direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blasting bag which is inserted into a blasting hole when crushing a crushed material such as bedrock or residual iron or concrete of a blast furnace by a blasting method.

[0002]

2. Description of the Related Art Conventionally, in order to crush an object to be crushed, such as bedrock, by a blasting method, blasting holes having a circular cross section with a predetermined depth are formed at appropriate intervals at a portion to be crushed. The blasting method is adopted in which cracks are generated in all directions from each blasting hole by loading the inside with explosives and then blasting. In such a blasting method, if the high temperature residual iron in the furnace is to be destroyed by blasting for the purpose of repairing the blast furnace, the explosive may explode due to the high temperature residual iron. Therefore, as described in Japanese Patent Application Laid-Open No. 4-155199 by the present applicant, a method in which an explosive is loaded in a cylindrical flexible bag and the bag is blown while water is supplied and filled therein. Was developed.

[0003]

However, since the bag body is flexible, it can be easily stored when not in use, but when used, the length direction of the bag is defined by blast holes. Not only does it take time and effort to orient in the drilling direction, but there is also the problem that the work of inserting this flexible elongated bag body into the deep part of the blast hole is extremely difficult and the work efficiency decreases. . An object of the present invention is to provide a bag for a blast hole capable of solving such a problem.

[0004]

In order to achieve the above object, a blast hole bag body of the present invention has a length that can be inserted into a blast hole having an oval cross section and a hole wall of the blast hole. At least one core member is mounted in the longitudinal direction on the peripheral wall surface of the bag main body having flexibility and formed in an elliptical cross-section that can be closely contacted with the The structure is such that a liquid injection port is provided on the end face.

Further, in the blast hole bag having the above structure, as described in claim 2, at least one of the core members is a liquid flow tube and its front end is opened in the bag main body. However, the structure may be such that the rear end is opened outside the bag main body. On the rear end surface of the bag main body, as described in claim 3, a charging port for the inside of the bag main body is provided. Further, as described in claim 4, the explosive may be fixed to the front end portion of the core material, or the explosive fixing tool may be attached to the inner surface of the front end of the bag body as described in claim 5. desirable. The cross section of the bag main body is formed into an elliptical shape as described in claim 6, and further, as described in claim 7, the bag main body has a smaller diameter than the liquid injection port on the bottom surface. It is also possible to provide a structure in which a drainage port is provided and at least one of the core members is a liquid flow tube and both ends thereof are opened outside the bag main body.

[0006]

[Function] Since the bag main body is flexible and the core material is attached to the peripheral wall surface in the length direction, the bag main body is contracted in the width direction with respect to the core material, so that the handleability is easy. Not only does the main body of the bag maintain a slender shape without shrinking in its length direction, the front end of the main body of the bag can be reliably directed to the opening end of the blast hole. The core material can be smoothly inserted into the blast hole while operating in a contracted state.

Further, when the liquid is injected from the injection port provided on the rear end surface of the bag main body, the bag main body is expanded by the liquid filling the inside thereof, and the outer surface is brought into close contact with the hole wall of the blasting hole, so that the explosive At the time of blasting, the blasting force is efficiently transmitted to the object to be crushed such as bedrock through the liquid. Further, in a bag having an oval cross section, the blasting force concentrates in the minor axis direction of the blast hole having an oval cross section and cracks occur in the major axis extension direction. Therefore, if a plurality of blasting holes are provided in the crushed object at regular intervals with the ends on the longer diameter side facing each other, cracks can be reliably generated between adjacent blasting holes.

Further, if at least one of the core materials is made into a liquid-flowing cylindrical body which communicates with the inside and outside of the bag main body, the liquid is supplied into the bag main body through this cylindrical body, especially the blast hole is inclined upward. It can be easily carried out when the bag is in the state of being in the state.In addition, by attaching an explosive fixing tool to the inner surface of the front end of the bag main body, the explosive is fixed to the bag main body and the bag main body is inserted into the blast hole The explosive can be accurately positioned at a predetermined portion in the deep part of the blast hole.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a blast hole 11 having an oval cross-section formed in a crushed object 10 such as rock mass, and the blast hole
The blasting bag bag is mainly formed in an elliptical cross section whose major axis and minor axis dimensions are slightly larger than the cross sectional shape of 11 (shown in FIGS. 3 and 4), and its front end surface 1a is completely sealed. In addition, at the center of the rear end face 1b, there is provided a charging port 2 that can be sealed by a fastener or other appropriate means, and at one side of the rear end face 1b, a liquid injection hose 12 that can be connected A mouth 3 is provided.

Further, at least one (two in the figure) rigid rod-shaped core material 4 is provided on the peripheral wall surface of the bag main body 1 over its entire length, and its exposed surface is flush with the outer peripheral surface of the bag main body 1. It is firmly fixed in the buried state. Such attachment means is performed, for example, by applying an adhesive to three surfaces except the upper surface of a core material having a rectangular cross section, and adhering the bag main body 1 while recessing the bag main body 1 along the adhesive surface. be able to. Further, one surface may be bonded to the inner surface of the bag main body 1. The bag main body 1 is formed of a synthetic resin sheet material having flexibility and flexibility or a water-impermeable sheet material in which a waterproofing agent is applied to a cloth, but in the case of breaking a high temperature furnace wall such as a blast furnace, , Fire resistant heat resistant fibers such as ceramic cloth.

When the blasting bag thus constructed is not in use, as shown in FIG. 2, the bag main body 1 is contracted in the width direction and the thickness direction by using the core material 4 as a holding portion, and contracted in the length direction. Are blocked by the core material 4 and maintained in a straight state. At the time of use, first, the explosive 13 is inserted from the charging port 2 into the bag main body 1 and the explosive 13 is attached to the inside of the bottom (inside the front end) of the bag main body 1 such as a string-like object. The core material 4 is fixed by a fixture, and then, with the bag main body 1 contracted in the width direction and the thickness direction, the length direction of the core material 4 is directed toward the drilling direction of the blast hole 11 and the core material 4 is pressed by an operator. While operating, the bag main body 1 is inserted into the blast hole 11 from the front end side.

As an attachment means for fixing the explosive charge 13 in the bottom of the bag main body 1, as shown in FIG. 5, a string-like object 5a or a hook-shaped locking tool 5b is formed on the inner surface of the front end surface 1a of the bag main body 1. (Fig. 6) is attached and means for binding the explosive 13 with the string-like object 5a or hooking the locking tool 5b to the binding strip of the explosive 13 or the inner bottom surface of the front end surface 1a of the bag main body 1 A velvet type fastener 5c (shown in FIG. 7) that engages with each other may be attached to the bottom of the explosive 13 and the explosive 13.

Further, before the core material 4 is attached to the bag main body 1, the explosive 13 is loaded by contracting the bag main body 1 in the longitudinal direction so that the inner surface of the front end surface 1a thereof faces the charging port 2. However, this operation cannot be performed when the core material 4 is attached first. Therefore, the bag body 1 is provided with an opening / closing port 7 that can be sealed by a fastener 6 or the like on the front end face 1a. The opening / closing port 7 may be opened. After the charging, the charging port 2 and the opening / closing port 7 are closed.

After the explosive 13 is loaded into the bag main body 1 and the lead wire 14 connected to the explosive 13 is brought out from the rear end face 1b of the bag main body 1, the bag main body 1 is blasted as described above. Hole
Insert within 11. At this time, the bag main body 1 can be smoothly inserted into the blast hole 11 by the rigid rod-shaped core member 4 and the bag main body 1 is contracted even if the blast hole 11 is slightly bent or the hole wall has irregularities. The insertion work can be done easily.

Thus, after the bag main body 1 loaded with the explosive 13 is inserted into the blast hole 11, the liquid injection hose 12 for water or the like is connected to the liquid injection port 3 as shown in FIGS. 3 and 4. When the pressurized liquid 15 is injected into the main body 1, the bag main body 1 is expanded by the injection pressure, and the outer peripheral surface is brought into close contact with the hole wall of the blast hole 11 entirely. When this state is reached, the valve 16 of the injection hose 12 is closed and the bag main body 1 is kept in close contact with the blast hole 11, and then the explosive 13 is exploded, and the explosive force becomes explosive 13. Of the blasting hole 11 having a cross-sectionally oblong hole shape with a short distance, it acts intensively in the long side, that is, in the short diameter direction, and the opposing long sides are separated by the blasting force, and both ends of the short side are A crack is generated from the part in the extending direction of the blast hole 11 in the major axis direction, and the blast hole 11 is crushed. At this time, since the liquid 15 as a filling material is filled between the explosive 13 and the hole wall of the blast hole 11, the blasting force of the explosive 13 is transmitted to the hole wall via the liquid 15 and the crushed object 10
Can be crushed efficiently.

FIG. 8 shows another embodiment of the bag for blast holes, in which one rigid rod-shaped core member 4 is fixed to one side of the outer periphery of the bag main body 1 over the entire length and other parts. A pipe 8 which also serves as a core is inserted in the side portion so as to correspond to the liquid injection port 3. The tip of the pipe 8 is opened in a state of being close to the inner bottom surface of the bag body 1 and the base end is the bag body. 1 has a structure in which it is fixed in a protruding state from the rear end face 1b. The other structure is similar to that of the above embodiment. Bag main body 1 having such a structure
Is suitable when the blast hole 11 is formed in an upwardly inclined state.

That is, the inner bottom portion (in the front end portion) of the bag main body 1
In the same manner as above, after the explosive 13 is loaded and fixed, the bag main body 1 is inserted into the blast hole 11 in the upward inclined state,
When the liquid 15 is injected from the hose 12 connected to the liquid injection port 3, the liquid 15 gradually fills the front end side of the bag main body 1 while increasing the liquid level from the rear end surface 1b side of the bag main body 1 to fill the front end of the bag main body 1. The air that reduces the blast efficiency that is enclosed can be discharged to the outside through the pipe 8. When the blast hole 11 is formed horizontally, the pipe 8 can be used for liquid injection and the liquid injection port 3 can be used as a liquid discharge port.

FIG. 9 shows still another embodiment of the bag for blast holes, in which the bag body 1 has a front end surface 1a and a bag body 1 having a rear end surface 1b.
A drain port 9 having a diameter smaller than that of the liquid injection port 3 provided in the bag main body 1 is provided in the bag main body 1 corresponding to the liquid injection port 3, and the pipe 8a serving also as a core is provided at the tip and the base. The opening with the end is made to project outside from the front and rear wall surfaces of the bag main body 1, respectively. The other structure is similar to that of the above-mentioned embodiment.

With such a construction, as shown in FIG. 10, after the explosive 13 is loaded in the deep position of the blasting hole 11 in a sideways state and the bag main body 1 is subsequently inserted into the blasting hole 11, When the liquid 15 is injected from the liquid port 3 through the hose,
The bag main body 1 is expanded by the pressurized liquid 15 injected into the bag main body 1 so that the outer peripheral surface of the bag main body 1 is brought into close contact with the wall of the blast hole 11 and a part of the liquid 15 is discharged from the small-diameter drain port 9 to the deep part of the blast hole 11. The liquid is discharged to the inside, fills the portion, and the excess liquid is discharged to the outside through the pipe 8a also serving as the core material. Explosives in this state 13
As described above, a crack is generated from both ends of the blast hole 11 having an elongated hole shape in the short side in the direction of extension of the blast hole 11 in the major axis direction. Although the bag body suitable for being inserted into the blast hole 2 having an oval cross section has been described in the above embodiment, the bag main body may have a circular cross-sectional shape, that is, a shape suitable for the cross-sectional shape of the blast hole. Good.

[0020]

As described above, according to the bag for blasting of the present invention, the bag having the length capable of being inserted into the blasting hole and having the shape formed so as to be in close contact with the hole wall of the blasting hole is provided. Since at least one core material is attached to the peripheral wall surface of the bag main body in the longitudinal direction, and the liquid injection port is provided on the rear end face which is the insertion end side of the blast hole of the bag main body, the bag main body Has flexibility and the core material is attached to its peripheral wall in the length direction, so that the bag main body is contracted in the width direction with respect to this core material to reduce the cross-sectional shape and facilitate handling. In addition to the above, the core material does not shrink in the length direction of the bag main body and always maintains an elongated shape, so that the length of the bag main body is oriented in the direction of the blast hole. It can be inserted smoothly into the blast hole while operating the One in which efficiency can be performed well.

Further, by mounting an explosive fixing tool such as a string-like object in the front end portion of the bag main body, the explosive is arranged at a predetermined position deep inside the blast hole at the same time when the bag main body is inserted into the blast hole. Furthermore, by injecting liquid from the injection port provided on the rear end surface of the bag main body, the bag main body expands, and the liquid pressure causes the bag wall to closely adhere to the entire wall of the blast hole and explode the explosive. At times, the blasting force can be efficiently transmitted to the crushed material such as bedrock through the liquid. Moreover, when the cross section of the blast hole is oval, the bag main body is formed in the same oval cross section as the cross section of the blast hole, so the blasting force of the explosive is concentrated in the minor axis direction of the blast hole. Therefore, a crack can be accurately generated in the direction of extension of the major axis.

[Brief description of drawings]

FIG. 1 is a simplified perspective view of a bag for blasting,

FIG. 2 is a simplified perspective view of the bag body in a contracted state,

FIG. 3 is a simplified vertical cross-sectional view showing a state in which a bag body filled with explosive is inserted into the blast hole 2.

FIG. 4 is a simplified vertical sectional side view thereof,

FIG. 5 is a vertical sectional side view of an essential part showing an example of an explosive fixing tool;

FIG. 6 is a vertical cross-sectional side view of a main part showing another example of the explosive fixing tool.

FIG. 7 is a vertical cross-sectional side view of a main part showing still another example of the explosive fixing device;

FIG. 8 is a partially cutaway simplified perspective view showing another embodiment of the bag for blast holes,

FIG. 9 is a partially cutaway simplified perspective view showing still another embodiment of the blast hole bag body;

FIG. 10 is a simplified vertical sectional side view showing the usage state.

[Explanation of symbols]

 1 Bag main body 1a Front end face 1b Rear end face 2 Charge port 3 Injection port 4 Rigid rod core 11 Blast hole 13 Explosive 15 Liquid

Claims (7)

[Claims] 1. A core material having a length capable of being inserted into a blast hole and having flexibility so as to be in close contact with a hole wall of the blast hole, and at least one core material in a longitudinal direction on a peripheral wall surface of the bag main body. And a liquid injection port is provided on the rear end face which is the insertion end side with respect to the blast hole of the bag main body. 2. At least one of the core members is a liquid flow tube, the front end of which is opened inside the bag main body and the rear end of which is opened outside the bag main body. Blasting bag described. 3. The blasting bag body according to claim 1, wherein a charging port into the bag body is provided on a rear end surface of the bag body. 4. The blast bag according to claim 1, wherein an explosive is fixed to the front end of the core material. 5. The blasting bag according to claim 1, wherein an explosive fixing tool is attached to the inner surface of the front end of the bag main body. 6. The bag-shaped main body has an oval cross section.
Blasting bag described. 7. A bottom of the bag main body is provided with a drainage port having a diameter smaller than that of the liquid injection port, and at least one of the core materials is a liquid flow tube and both ends thereof are open outside the bag main body. The bag for blasting according to claim 1, wherein: