JPH05306900A - Bag for loading explosive in blasting device - Google Patents

Abstract

PURPOSE:To provide a bag body for loading explosive in blasting device for rapturing remaining pig iron in a blast furnace to be repaired through blasting. CONSTITUTION:A tubular bag body 1, into which explosive is loaded, is made of textile made of fire resistant and heat resistant fibers such as ceramic fibers and the like, while heat resistant water stopping material 4, such as silicon rubber and the like, is stuck to the inner surface of the same through coating. The length and the diameter of the bag body is formed so as to be larger than the depth and diameter of a blasting hole 11 and the bag is inserted into the blasting hole 11 after loading explosive 7 into the tubular bag body 1, then, the explosive is exploded under a condition that cooling water is supplied into the bag body 1 to expand it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosive loading bag for an explosive device for destroying hot residual iron in the furnace by blasting when the aging blast furnace is repaired.

[0002]

2. Description of the Related Art The hearth and furnace wall of a blast furnace have a structure in which a steel skin, a stave cooler, and refractory bricks are sequentially laminated from the outside, but the refractory bricks have a useful life of about 15 years. It is necessary to perform blast furnace repair work on a regular basis. At the time of this repair, the hot metal remained at the bottom of the furnace and remained as residual iron.Therefore, this residual iron was cooled and solidified prior to the repair, but the residual iron at the time of solidification is at a high temperature of 600 ℃ or higher. And its tensile strength is 2000-3000 kg / cm ² ,
The compressive strength is even higher and is very difficult to remove.

For this reason, conventionally, after blasting holes are formed in the residual pig iron, explosives are loaded into the blasting holes to explode the residual pig iron. On this occasion,
Since explosives, especially detonators, may explode due to high temperature residual iron, the hole wall of the blast hole is cooled with water before charging, but the hole wall is below the heat resistant temperature of the explosive and detonator. It will take a long time to cool down, and the work efficiency for blast furnace repair will decrease.

Therefore, a method in which an explosive or detonator is charged in a metal cylinder provided with a heat insulating layer such as asbestos is loaded into the blasting hole to explode, or inside the inner tube of the metal double tube explosive,
A method has been developed in which a detonator is charged and sealed with sand or other filler, and a double tube is inserted into the blast hole while supplying cooling water to the space of the inner and outer tubes to explode.

[0005]

However, according to the former method, a heat insulating layer such as asbestos does not provide a sufficient heat insulating effect, which causes a problem in safety, and also causes a problem in blast holes. In order to enable insertion, the diameter of the blast hole must be made sufficiently larger than the diameter of the metal cylinder, so there is a gap between the inner wall of the blast hole and the outer peripheral surface of the metal cylinder. However, there is a problem in that the blasting efficiency is lowered.

On the other hand, according to the latter method, since the metal tube is used, the blast hole cannot be charged even if the blast hole is slightly bent. Therefore, the blast hole is similar to the former method. If the hole diameter of the metal tube is made large so that the metal tube can be charged, a void is formed between the hole wall of the blast hole and the outer peripheral surface of the metal tube, and the blasting efficiency is reduced. In addition, a metal double tube is heavy and difficult to handle, and there is a problem that workability is deteriorated. It is an object of the present invention to provide an explosive loading bag in an explosive device capable of completely eliminating such problems.

[0007]

In order to achieve the above object, the explosive loading bag in the blast device of the present invention has a high temperature blasting hole while loading explosive into the bag whose end is closed and supplying water. In the blasting device configured to blast inside, the bag body has a diameter larger than that of the blasting hole, and is formed into an elongated tubular bag having flexibility by a fire-resistant and heat-resistant fiber such as a ceramic cloth, It has a structure that its inner surface is coated and adhered with a heat resistant waterproof material such as silicone rubber.

[0008]

After the explosive is loaded into the tubular bag, the opening of the bag is sealed with an appropriate lid, and the bag is inserted into the blast hole formed at the appropriate place in the residual iron of the blast furnace. .. Since the tubular bag has flexibility, it can be easily inserted even if the blast hole is bent. A cooling water supply pipe and a drain pipe are arranged in advance in the lid in a penetrating state, the cooling water is injected and filled into the bag through the supply pipe, and the inner surface is coated and adhered with a water blocking material. When the bag body is expanded and brought into close contact with the inner surface of the hole wall of the blast hole, the bag body is made of refractory fiber, so that the cooling water that can sufficiently withstand high temperature residual pig iron and flows in the bag body. By absorbing the high temperature from the residual pig iron side and discharging the heated cooling water to the outside through the discharge pipe, the explosive charged in the bag bottom is kept in an adiabatic state from the high temperature residual pig iron. By detonating explosives in this state, a part of the residual iron is destroyed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings, in which 1 is a flexible elongated tubular shape formed with a diameter and length slightly larger than the length and diameter of the blast hole 11. In the bag,
Its tip is sealed and its base is open,
The opening end is closed in a watertight state by fitting the lid body 2 and fastening the outer peripheral surface of the opening end portion of the bag body covering the lid body 2 with an appropriate binding tool 3 such as a band. It is configured as follows.

The tubular bag 1 is formed of a fireproof cloth, and is woven into a cylindrical shape with its tip closed by fireproof / heatproof fibers, or a rectangular fireproof cloth is cylindrical. It can be manufactured by curving and forming the cylindrical cloth by adhering the opposite edges to each other by adhesion or the like, and integrally attaching the circular refractory cloth to one opening end by adhesion or the like.

As the refractory fiber forming the tubular bag 1,
Carbon fiber (decomposition temperature 3600 ℃), flame resistant carbon fiber (decomposition temperature 500 ℃), ceramic fiber (melting point 1300 ℃),
There are glass fibers (melting point 700 ° C), high silica glass fibers (melting point 900 ° C), etc., and the inner surface of the tubular bag body 1 woven with such refractory fibers is made of silicone rubber, Teflon, or other flexible material. The heat resistant water blocking material 4 is coated and adhered to form a water blocking layer.

The lid 2 attached to the open end of the tubular bag 1 has a cooling water drain pipe 5 consisting of a short pipe, and a tip end when the lid 2 is mounted in the tubular bag 1. Is mounted in a watertight manner with a rigid cooling water supply pipe 6 made of a long pipe that reaches near the tip of the bag 1, and a paper bag or paper is attached on the tip of the cooling water supply pipe 6. Several explosives 7 enclosed in a cylinder are arranged and fixed to the cooling water supply pipe 6 by an appropriate binding tool 8 such as a band. Further, a detonator 9 is attached to the rear end of the explosive 7, and the tip of the leg 10 introduced into the cylindrical bag 1 from the outside of the lid 2 through the lid 2 in a watertight manner is attached to the detonator 9. It is connected to.

In order to load the explosive 7 into the tubular bag body 1, the long cooling water supply pipe 6 is inserted into the bag body 1 while holding the base end portion of the tubular bag body 1 inside the bag body 1 easily. And the lid 2 reaches the open end of the bag 1 and
The opening end is sealed by attaching to the opening end, and thus the blasting device in which the explosive 7 is loaded in the bag body 1 is obtained.

Using the blasting device thus constructed,
In order to destroy the aging residual iron of the blast furnace, first, a part of the iron shell 13 of the blast furnace 12, the stave cooler and the refractory brick 14 are removed by appropriate mechanical destruction, etc. After exposing a part of the remaining pig iron (15), a plurality of blast holes (11) are bored in the residual pig iron (15) using an appropriate punching device. The diameter of the blast hole 11 is smaller than that of the cylindrical bag 1 if the outer diameter of the cylindrical bag 1 is about 65 mm.

Also, a cooling water supply hose 16 and a drain hose 17 are connected to the base ends of the cooling water supply pipe 6 and the drain pipe 5 which penetrate through the lid 2 of the blasting device and project to the outside. Keep it. After that, the cylindrical bag 1 of the blasting device is blasted with a blast hole 11
Insert inside. Before inserting the tubular bag 1 into the blast hole 11, it is effective to put a small amount of water into the bag 1 through the cooling water supply pipe 6 to eliminate the air in the bag low 1. It is desirable to increase

Since the tubular bag 1 is made of a soft and flexible material, even if the inner wall of the blast hole 11 has an uneven surface or a bend, it can be inserted smoothly without any obstacle. You can When the tubular bag 1 is inserted into the blast hole 11, water is injected into the blast hole 11 to cool the blast hole 11 to some extent and then the tubular bag 1 is inserted. Good. Further, if a temperature detecting means such as a thermo label is attached to the cooling water drain pipe 5, the temperature in the blast hole can be easily detected and confirmed at the time of insertion or after the insertion, and the flow rate of the cooling water is adjusted. be able to.

When the cooling water is pumped into the cylindrical bag 1 from the cooling water supply hose 16 through the supply pipe 6 while inserting the cylindrical bag 1 into the blast hole 11, or immediately after the insertion, the cooling water is supplied. It is injected into the tubular bag 1 from the tip of the pipe 6, fills the tubular bag 1 and immerses the explosive 7 and the detonator 9 in the cooling water, and insulates against the high temperature from the blast hole 11 side. In addition to having the effect, the tubular bag 1 is expanded in the outer diameter direction by the cooling water filling the outer peripheral surface of the tubular bag 1 to be in close contact with the inner wall of the blast hole 11.

Further, the cooling water which is filled and filled in the tubular bag 1 absorbs the high temperature from the residual iron side which is transmitted to the tubular bag 1 while absorbing the high temperature from the rear end cover 2 in the tubular bag 1. The water flows to the side of the drain pipe 5 that penetrates through and is discharged from the drain pipe 5 to the outside through the drain hose 17 while raising the temperature. In this way, the explosive 7 and the detonator 9 loaded in the tubular bag 1 are kept in adiabatic state from the hot residual iron by the flowing cooling water injected into the tubular bag 1. ..

It should be noted that the cooling water injected into the tubular bag 1 causes a desired expansion pressure to be produced in the tubular bag 1 so that the blast hole
In order to bring the tubular bag 1 into close contact with the hole wall of 11, the drainage pipe 5 is formed to have a smaller diameter than the cooling water supply pipe 6, or the drainage pressure is increased by means such as squeezing the drainage appropriately. Adjust so that

In this state, a lead wire or a bus bar (not shown) is attached to the leg wire 10 protruding from the lid body 2 of the tubular bag body 1 to the outside.
Is connected to energize to explode the explosive 7 to destroy a part of the residual iron. In the above embodiment, the cooling water supply pipe 6 is formed as a long pipe and the cooling water drain pipe 5 is formed as a short pipe, but this may be reversed. In this way, when the blast hole 11 is formed obliquely upward, it is better to use the short pipe as the cooling water supply pipe and the long pipe as the cooling water drain pipe for the air inside the tubular bag body 1. Is preferable because it does not remain.
Further, the explosive 7 may not necessarily be attached to the long tube, but may be fixed to a separate rod-shaped body that penetrates the lid 2.

[0021]

As described above, according to the explosive loading bag in the blasting device of the present invention, the explosive is loaded into the bag whose end is closed, and water is supplied to explode in the high temperature blasting hole. In the configured blasting device, the bag body is formed into a flexible elongated tubular bag having a diameter larger than that of the blast hole and made of fire-resistant and heat-resistant fibers such as ceramic cloth,
Since the inner surface is coated and adhered with a heat-resistant waterproof material such as silicon rubber, the tubular bag has flexibility, so the inner wall of the blast hole will not have uneven surfaces or bends. Even if it occurs, it can be easily inserted while being deformed according to the shape of the inner wall of the blast hole without any damage.

Furthermore, since the tubular bag is made of fire-resistant and heat-resistant fiber, it can withstand high temperature residual iron sufficiently without being damaged and can protect the explosive charged inside from high temperature. At the same time, a heat-resistant waterproof material such as silicone rubber is coated and adhered to the inner surface of the bag, so that the cooling water can be filled and filled without leaking outside to absorb the high temperature from the residual pig iron side. In addition, the explosive can be kept immersed in the cooling water, and the explosive can be kept in a heat-insulated state from the hot residual iron.

Further, since the diameter of the flexible tubular bag is formed to be larger than that of the blast hole, when cooling water is supplied into the bag, the bag expands and the outer peripheral surface of the bag expands. Since it can be brought into close contact with the inside of the blasting hole, there is no gap between the tubular bag and the blasting hole, the blasting efficiency can be significantly improved, and the blasting hole is formed obliquely upward. Even in such a case, the cylindrical bag body inserted into the blast hole can be filled with the cooling water while inflating the cylindrical bag body by injecting the cooling water, so that the blasting operation can always be performed safely.

[Brief description of drawings]

FIG. 1 is a simplified vertical sectional side view of an explosive loading bag,

FIG. 2 is a simplified vertical cross-sectional side view showing a state in which an explosive device having an explosive loaded inside the bag is inserted into a blast hole;

FIG. 3 is a schematic cross-sectional view showing a state in which the blasting device is inserted into a blast hole formed in the residual iron of the blast furnace.

[Explanation of symbols]

 1 Fire-resistant tubular bag 2 Lid 4 Heat-resistant waterproof material 5 Cooling water drain pipe 6 Cooling water supply pipe 7 Explosive

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Idezaki 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Co., Ltd. Technical Development Division, Kaisha (72) Inventor Akemi Hasegawa 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Co., Ltd. Akaisha Technology Development Headquarters (72) Inventor Mitsuo Sasaki 20-1 Shintomi, Futtsu City, Chiba Prefecture Nippon Steel Co., Ltd. Akaisha Technology Development Headquarters (72) Inventor Hideo Karatani Nakahara, Tobata-ku, Kitakyushu, Fukuoka Prefecture 46-59 Shin Nippon Steel Co., Ltd. Machinery & Plant Division (72) Inventor Yukio Ishizaka 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka City Incorporated Okumura-gumi (72) Inventor Tatsuhiro Kocho Abeno, Osaka-shi Okumura Gumi, 2-2-2 Matsuzaki-cho, Tokyo (72) Inventor Mikihiko Inaoka 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka (72) Inventor Tatsunada Kakuda, 2-2, Matsuzaki-cho, Abeno-ku, Osaka City, Okumura Gumi, Inc. (72) Kenji Yoshikawa, 2-2, Matsuzaki-cho, Abeno-ku, Osaka City, Okumura-gumi, Inc. ( 72) Inventor, Akigosaka, 2-6-1, Nishi-Nagasu-cho, Amagasaki-shi, Nard Institute Co., Ltd. (72) Noriko Matoba, 2-6-1, Nishi-Nagasu-cho, Amagasaki-shi, Nard Institute, Ltd.

Claims (3)

[Claims] 1. A blasting device configured to load explosives into a bag whose end is closed and to blow water in a high temperature blasting hole while supplying water, wherein the bag has a larger diameter than the blasting hole and fire resistance. A bag for charging explosives in a blasting device, characterized in that it is formed of a heat-resistant fiber into a flexible elongated tubular bag, and a heat-resistant waterproof material is coated and adhered to the inner surface of the bag. 2. The explosive in the blasting device according to claim 1, wherein the elongated tubular bag is woven in a tubular shape with a heat resistant cloth such as ceramic cloth, carbon cloth, and flameproof carbon cloth. Bag for loading. 3. The explosive loading bag in the blasting device according to claim 1, wherein the heat-resistant waterproof material is silicon rubber.