JPH04155199A - Demolition equipment - Google Patents

Abstract

PURPOSE:To effect demolition work safely at all times by a method wherein a cooling water supplying tube and a discharging tube, projected from the base end of a tubular bag body, are connected to a cooling water supplying hose and a discharging hose while the tubular bag body, filled with explosive, is inserted into a blasting hole and cooling water is supplied to the supplying tube. CONSTITUTION:A cooling water supplying tube 5 is inserted into the tip end of a tubular bag body 1 while penetrating through a lid body 2 and an explosive charge 4 is arranged on the fore part of the supplying tube 5. When the cooling water supplying tube 5 is inserted into a blasting hole 16 through the lid body 2, the tube 5 is inserted easily into the blasting hole 16 while being pushed through the explosive charge 4. The tubular bag body 1 is formed of a soft flexible material and, therefore, the bag body 1 can be inserted smoothly even when recessed and projected surfaces or curvatures are generated on the internal wall of the blasting hole 16. When cooling water is sent into the supplying tube 5 in the tubular bag body 1 through a cooling water hose 7, the tubular bag body 1 is filled with the cooling water and the charge 4 as well as a primer 10 are submerged into the cooling water and adiabatic effect is generated with respect to a high temperature from the side of the blasting hole 16 while the tubular bag body 1 is inflated and the outer peripheral surface is contacted closely and wholely with the inner wall of the blasting hole 16. The temperature of the cooling water is risen and the cooling water is discharged to the outside of a system through a discharging hose 9.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention mainly relates to a blasting device that destroys residual pig iron in the furnace by blasting when renovating an aging blast furnace.

(Prior art) The hearth and walls of a blast furnace have a structure in which an iron shell, a stave cooler, and refractory bricks are sequentially laminated from the outside, but the useful life of refractory bricks is about 15 years, , it is necessary to carry out its repair work periodically.

During this renovation, hot metal remained in the two furnace bottoms and became residual pig iron. or higher temperature and its tensile strength is 2000 to 3000
kg/ci, and even more than that, making it extremely difficult to remove.

For this reason, it has conventionally been done to destroy the pig iron residue by drilling a blast hole in the blast hole and then loading an explosive into the blast hole and detonating it.

At this time, there is a risk that the explosives, especially the detonator, may explode due to the high-temperature residual iron, so the walls of the blast hole are cooled with water before charging, but the heat resistance temperature of the explosives and detonator is lower than that of the blasting cap. It takes a long time to cool down the product, which reduces work efficiency.

Therefore, explosives were placed inside a paper tube with a heat insulating layer made of asbestos, etc.
There is a method for loading a detonator into a blast hole, a method for loading explosives and a detonator into the inner tube of a metal double tube, sealing it with sand or other filler, and adding cooling water to the space between the inner and outer tubes. A means has been developed to insert the double pipe into the blast hole while supplying

(Problem to be Solved by the Invention) However, according to the former method, not only is there a problem in terms of safety because a sufficient heat insulating effect cannot be obtained with a heat insulating layer such as asbestos, but there is also a problem with the blast hole. To enable reliable insertion, the diameter of the blasting hole must be made sufficiently larger than the diameter of the cylinder, so a gap is formed between the inner wall of the hole and the outer circumferential surface of the cylinder, which prevents the blasting. There is a problem that efficiency decreases.

On the other hand, according to the latter method, since a metal tube is used, even if the blast hole has a slight bend, charging becomes impossible. If the diameter of the hole is increased to enable charging, voids will be formed between the hole walls, reducing blasting efficiency. Furthermore, if a part of the side wall of the blast furnace is removed to expose the residual pig iron and an upwardly sloping blast hole is drilled on the side of the residual pig iron, a double tube is inserted into the blast hole and the inner and outer tubes are removed. When cooling water is supplied to the space, the water on the return side escapes because the cooling water supply and outlet are in direct communication with the base end of the space, causing the cooling water to flow into the space. In some cases, the air is not filled with water, and reliable cooling is no longer performed, which poses a safety problem.

In addition, metal double pipes have the problem of being heavy and difficult to handle (and reducing workability).

The object of the present invention is to provide a blasting device for blast furnace residual pig iron, etc., which can completely eliminate these problems.

(Another Means for Solving the Problems) In order to achieve the above object, the explosive device of the present invention has explosives loaded in the front half of a flexible and watertight slender cylindrical bag with a sealed tip. A long tube and a short tube are inserted into the cylindrical bag, so that the front end opening of the long tube faces the inner surface of the front end of the bag, and a sealing lid attached to the proximal opening of the bag is inserted. The short tubes are passed through the bag in a watertight manner, and the short tubes are attached to the airtight lid body in a single state so that the front end of the opening protrudes into the bag body, so that cooling water is supplied into the bag body from one tube and It has a structure in which the explosive is discharged from the tube and the # wire of the explosive is led out to the outside by passing through the airtight lid.

(Function) A cooling water supply pipe and a discharge pipe protrude from the base end of the cylindrical bag.
After connecting the cooling water supply hose and the discharge hose, the cylindrical bag loaded with explosives is inserted into the blast hole drilled at the appropriate location in the blast furnace.

At this time, since the cooling water supply pipe is installed near the tip of the cylindrical bag, by inserting this supply pipe into the blast hole, the cylindrical bag is pushed in and the hole is drilled integrally. In addition, since the cylindrical bag is made of a flexible sheet material, even if the blast hole is curved, it can be inserted radially along the wall surface of the hole. It is inserted while shrinking and deforming.

If cooling water is supplied to the supply pipe through the cooling water supply hose while inserting the cylindrical bag into the blast hole, or immediately after insertion, the bag will be filled with cooling water and the explosives and detonator will be immersed in the cooling water. As the temperature rises, the bag expands due to the water pressure and comes in close contact with the hole wall of the blast hole, and the cooling water absorbs the high temperature from the iron residue side, and the heated cooling water is discharged to the outside through the discharge pipe. At the same time, the explosives and detonators loaded in the cylindrical bag are kept insulated from the high-temperature iron residue.

A lead wire and a bus bar are connected to the leg wires protruding outside from the rear end of the bag in this shape H, and a part of the residual pig iron is destroyed by energizing and detonating the explosive.

The blasting device of the present invention can also be used for blasting rock and the like.

(Example) To explain the embodiment of the present invention with reference to the drawings, (1) is an elongated cylindrical bag formed with a diameter slightly larger than that of the blast hole and a length comparable to the depth of the blast hole. If the body is made of a fabric woven from heat-resistant fibers or a non-water-permeable heat-resistant synthetic resin sheet material, if the fabric is made of heat-resistant fibers, heat-resistant paint should be applied to the entire surface of the fabric. It is formed to be water-impermeable.

The front end of this cylindrical bag (1) is sealed without being opened, and a lid (2) is fitted into the rear end opening to cover the bag (1). A lid (2) is attached in a watertight manner by tightening the rear end with a suitable fastener (3) such as a hand, and the opening is sealed by the lid (2).

(4) is an explosive sealed in a paper bag or paper tube, and several of these explosives (4) are inserted into a long cooling water supply pipe (5) made of a rigid steel pipe.
It is arranged in series on the top and is integrally fixed to the front part of a long cooling water supply pipe (5) with a suitable fastener (6) such as a hand, and the supply pipe (5) is connected to a cylindrical shape. By inserting into the bag (1) these explosives (4) are arranged in the front part of the bag (1).

The cooling water supply pipe (5) is laid down on the inner bottom surface of the bag body (1), and has its opening front end facing the vicinity of the inner surface of the front end of the cylindrical bag body (1), and the rear end of the cooling water supply pipe (5). The end portion is attached to the lid body (
The lower part of the outer periphery of 2) is watertightly penetrated and protruded to the outside, and a flexible cooling water supply hose (7) is detachably connected to the protruding end.

(8) is a short steel cooling water discharge pipe that penetrates and is supported in a watertight manner on the upper outer periphery of the lid body (2), and its inner end protrudes into the base end of the cylindrical bag body (1). , is open and has an outer end protruding from the lid body (2) to the outside, and a cooling water discharge hose (9) is detachably connected to the protruding end.

0ω is a detonator attached to the rear end of the rearmost explosive (4), which penetrates the lid (2) from the outside of the lid in a water-tight manner to open the cylindrical bag (1).
) is connected to the detonator aω.

In addition, in the above embodiment, the cooling water supply pipe is a long pipe,
Although the cooling water discharge pipe is formed into a short pipe, it may have the opposite shape. That is, when the blasting hole faces upward, it is preferable to use the short tube as the cooling water supply tube and the long tube as the cooling water discharge tube because air will not remain in the bag.

Furthermore, the explosive (4) does not necessarily have to be fixed to the long tube, but may be fixed to a separate rod that passes through the lid by inserting it.

To explain the usage of the residual pig iron blasting device configured in this way, it is used to
3), the stave cooler, and the refractory bricks 04) are removed by appropriate mechanical destruction to expose a part of the residual pig iron 05) deposited and solidified at the bottom of the blast furnace.

The residual pig iron is then removed using a suitable drilling device (not shown).
A plurality of blast holes 06) are bored in 5).

If the outer diameter of the cylindrical bag (1) is about 651, the diameter of the blast hole 06) is smaller than that (65 cm or less).

On the other hand, a cooling water supply hose (7) is connected to a cooling water supply pipe (5) and a discharge pipe (8) that protrude from the lid (2) of the cylindrical bag (1) in which explosives are loaded. Discharge hose (
9) and then insert this cylindrical bag (1) into the blast hole 06).

Note that before inserting the cylindrical bag (1) into the blasting hole 06), a small amount of water is poured into the bag (1) via the supply pipe (5).
It is desirable to remove the air inside the bag (1) in order to enhance the blasting effect.

The cooling water supply pipe (5) is inserted into the cylindrical bag (1) through the lid (2) to the inside of its tip, and the cooling water supply pipe (5) is inserted into the front part of the supply pipe (5). Since the medicine (4) is integrated, grasp the cooling water supply pipe (5) that protrudes backward from the lid (2) and push this supply pipe (5) into the blasting hole Q6). By inserting it like this, it can be easily inserted into the blasting hole 06) while being pressed through the explosive (4), and since the cylindrical bag (1) is made of a soft and flexible material, the blasting Even if the inner wall of the hole 06) is uneven or curved, it can be inserted smoothly without any hindrance.

In addition, when inserting the cylindrical bag (1) into the blast hole θω, water is injected into the blast hole (16) to cool the blast hole 0ω to some extent, and then the cylindrical bag (1) is inserted into the blast hole θω. may be inserted. Additionally, if a temperature detection means such as a thermoher is attached to the cooling water discharge pipe (8), the temperature inside the blast hole during or after insertion can be easily detected and confirmed, and the flow rate of the cooling water can be adjusted. This is preferable because it can be adjusted.

While inserting this cylindrical bag (1) into the blasting hole θω, or immediately after insertion, cooling water is pumped through the cooling water hose (7) to the supply pipe (5) inside the cylindrical bag (1). Cooling water is injected into the cylindrical bag (1) from the tip of the supply pipe (5), and the cylindrical bag (1) is filled with explosives (4) and detonators (GO).
is immersed in the cooling water to act as a heat insulator against high temperatures from the blasting hole 0ω side, and the cylindrical bag (1) expands in the outer radial direction due to the water pressure, so that the outer peripheral surface touches the inner wall of the blasting hole 0ω. Close contact across the board.

Furthermore, the cooling water injected and filled into the cylindrical bag (1) is
A discharge pipe (opening at the rear end of the cylindrical bag (1)) absorbs high temperature from the pig iron side that transfers heat to the cylindrical bag (1).
8) and is discharged to the outside from the discharge pipe (8) through the discharge hose (9) while increasing in temperature.

In this way, the cooling water injected into the cylindrical bag (1) and flowing allows the explosives (
4) and detonator 00) are kept in an insulated state from high-temperature residual pig iron.

In addition, the cooling water injected into the cylindrical bag (1) generates a desired expansion pressure in the cylindrical bag (1), and the blast hole G
In order to bring the cylindrical bag body (1) into close contact with the hole wall of O, the discharge pipe (8) is formed to have a smaller diameter than the cooling water supply pipe (5), or by appropriately narrowing the discharge side. This is to adjust the pressure on the , side to be higher.

In this state, the leg line 0υ which protrudes outside from the lid body (2) of the cylindrical bag body (1), the lead wire, and the generatrix (not shown)
A part of the residual pig iron is destroyed by connecting it and energizing it to detonate the explosive.

Moreover, it goes without saying that this blasting device can be used not only for blasting residual pig iron in a blast furnace, but also for blasting rock, etc.

(Effects of the Invention) As described above, according to the blast furnace residual iron blasting device of the present invention, explosives are loaded into the front half of the elongated cylindrical bag having flexibility and water-sealing properties with a sealed tip. A long tube and a short tube are inserted into the cylindrical bag so that the front end opening of the long tube faces the inner surface of the front end of the bag and is watertightly attached to the airtight lid attached to the proximal opening of the bag. and further, by attaching the short tube to the airtight lid in a penetrating state and causing its opening front end to protrude into the bag body, cooling water is supplied into the bag body from one tube and discharged from the other tube. The structure is such that the legs of the explosive pass through the sealed lid and lead out to the outside, so the cooling water supply pipe passes through the sealed lid at the rear end of the cylindrical bag. Since the cooling water supply pipe is charged up to the vicinity of the tip of the cylindrical bag, the cylindrical bag can be reliably and smoothly inserted into the blasting hole while manipulating the cooling water supply pipe at hand. is made of a flexible material, so even if the inner wall of the blast hole is uneven or curved, it will not suffer any problems and will contract according to the shape of the inner wall of the blast hole. It can be easily inserted while being deformed.

Furthermore, if cooling water is supplied to the supply pipe through the cooling water supply hose during or immediately after inserting the cylindrical bag into the blast hole, the bag will be filled with cooling water and the explosives and detonators will be immersed in the cooling water. Since the cylindrical bag is flexible, it expands due to the water pressure of the cooling water filling the inside and closes the blast hole. The blasting material can be completely brought into close contact with the hole wall without creating a gap between the hole wall and the blasting efficiency.

In addition, the cooling water injected into the cylindrical bag from the cooling water supply pipe fills the cylindrical bag and flows toward the discharge pipe, during which time it absorbs the high temperature from the iron residue side, so the cylindrical bag The explosives and detonators loaded inside the body can be kept insulated from the high-temperature iron residue, and the gap between the explosives and the blast hole is completely replaced by cooling water filling the cylindrical bag. Not only can the generation of post-gas be almost eliminated, but also the blasting effect can be increased.Furthermore, since the filling is not done as in the conventional method, there is no risk of cutting the leg line, making it reliable. This enables blasting work.

Furthermore, even when the blasting hole is drilled diagonally upward, the cylindrical bag (1) inserted into the blasting hole is inflated by injection of cooling water to fill the coughing bag with cooling water. This allows blasting work to be carried out safely at all times.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a simplified vertical side view of the cylindrical bag inserted into a blast hole, FIG. 2 is a simplified vertical side view of the cylindrical bag inflated, and FIG. 1 is a simplified cross-sectional view of a state in which it is inserted into a blast hole drilled in a residual pig iron portion of a blast furnace. (1)... Tubular bag body, (2)... Lid body, (4)...
・Explosives, (5)...Cooling water supply pipe, (7)...Cooling water supply hose, (8)...Cooling water discharge pipe, 00]...
・Detonator, (11)...# wire, (+6)...blasting hole.

Claims (1)

[Claims] (1) Load explosives into the front half of a flexible and watertight elongated cylindrical bag with a sealed tip, insert a long tube and a short tube into the cylindrical bag, and then The front end opening of the tube is made to face the front inner surface of the bag body, and the tube is made to penetrate in a watertight manner through a sealing lid attached to the proximal opening of the bag, and further, the short tube is attached to the sealing lid in a penetrating state. By making the front end of the opening protrude into the bag body, cooling water is supplied into the bag body from one tube and discharged from the other tube, and the legs of the explosive are passed through the sealed lid body. An explosive device characterized by being led out to the outside. (2) The explosive device according to claim (1), wherein the explosive is integrally attached to a long tube.