JPH0443199B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a blasting method, and particularly to a blasting method that makes it possible to effectively utilize the explosion energy of explosives.

<<Prior Art>> For rock crushing work, etc., a blasting method using an explosive called dynamite is generally used.

Among these methods, the ABS (Aqua Blasting System) method uses a PVC pipe filled with water and loaded with explosives, which is inserted into the explosion hole and detonated.

This construction method uses the blasting effect caused by the incompressibility of the water that fills the interior to apply the impact force of the explosive at right angles to the pipe wall, efficiently propagating it as a cylindrical wave and preventing loss of crushing energy. At the same time, it brought about efficient crushing action with a small amount of explosives, and was attracting attention as a construction method with low noise, low vibration, and fewer flying stones.

<<Problems to be Solved by the Invention>> However, even with this construction method, a gap is created between the explosion hole and the PVC pipe, and energy loss due to this space becomes a problem.

In other words, if there is a gap between the blast hole and the pipe, some of the blast pressure energy during the explosion will compress that space. In other words, it was found that part of the explosion energy was absorbed by the space, and as a result, the crushing energy was significantly reduced.

In addition, other disadvantages of this method include the troublesome work of loading explosives and water into the PVC pipe, the complicated blasting preparation work, the unpleasant odor caused by the combustion of the PVC pipe during an explosion, and the chlorine There is a problem with the generation of toxic gases such as

The present invention solves the above-mentioned problems, and while enjoying the advantages of conventional ABS construction methods, it is also possible to convert explosion energy into crushing energy more efficiently than before, and to perform blast preparation work more efficiently. The purpose is to prevent the generation of strange odors and toxic gases during explosions.

<Means for Solving the Problems> In order to achieve the above object, the present invention involves inserting a flexible bag containing an explosive and a water-absorbing polymer into a pre-drilled explosion hole, Water is injected through the opening of the body, and the water-absorbing polymer absorbs and retains water, causing it to swell while retaining water, causing the bag to adhere tightly to the wall of the explosion hole, and then closing the explosion hole. The opening of the bag is closed, and then the explosive is ignited via a fuse led out from the bag.

《Operation》 When water is injected through the opening of the flexible bag, the water-absorbing polymer takes in the water and swells, and the bag expands accordingly, completely eliminating the air inside the explosion hole. Served. The water-absorbing polymer retains the water it takes in, so it retains its shape without causing the water to fall due to gravity, so this method can be carried out without being limited by the shape of the explosion hole. In particular, there are no restrictions on the implementation of this method even if the opening is sloped and lower than the location where the explosive is installed, or even if the explosive is installed facing upwards from the explosion hole. .

In addition, since explosives and water-absorbing polymers are stored inside the bag, it not only simplifies the preparation work for blasting, but also allows the outside of the bag to be expanded when water is injected. To ensure that the surface is in close contact with the inner wall of an explosion hole without being affected by the presence of explosives.

<<Example>> Hereinafter, an example of the present invention will be described in detail using the drawings.

1 to 4 are explanatory sectional views showing blasting preparation work according to the present invention.

In each figure, 1 is an explosion hole drilled in the tunnel bedrock E, and 2 is a cylindrical flexible bag, such as a plastic bag, containing dynamite (explosives) 3 and granular water-absorbing polymer 4.

The plastic bag 2 is slightly thicker than the diameter of the explosion hole 1 and about 4/3 of the length of the hole, and protrudes beyond the hole opening when inserted.

The dynamite 3 has a parent dynamite 3a in which a detonator is buried and a filler material 3b wrapped together in a cylindrical portion, from which a fuse 3c is led out.

The water-absorbing polymer 4 is a material capable of absorbing and retaining water hundreds to thousands times its own weight, and is made of starch-based carboxy cellulose, which is made by graft polymerizing acrylic acid to starch. There are synthetic polymer systems such as cellulose based on graft polymerization of acrylate, vinyl acrylate alcohol copolymer, acrylic acid polymer, acrylic acid/acrylamide copolymer, and modified polyethylene oxide.

In Figure 1, after drilling the explosion hole 1, the insertion rod 5
Insert the plastic bag 2 deep inside the explosion hole 1 using the . At this time, the fuse 3c of dynamite 3
is led out from the opening of the plastic bag 2.

Next, as shown in FIG. 2, the discharge pipe 7 of the injection pump 6 installed in the mine near the explosion hole 1 is connected to the opening of the plastic bag 2, and water is injected into the inside of the bag 2. .

By injecting water, the water-absorbing polymer 4 rapidly starts to swell while incorporating water into its molecules.

Therefore, the plastic bag 2 expands within the blast hole 1 and comes into close contact with the wall surface of the blast hole 1.

In this state, the interior of the plastic bag 2 maintains a gelatinous state due to the absorption of water by the water-absorbing polymer 4, thereby retaining water.

Next, as shown in Fig. 3, pull up the part of the plastic bag 2 protruding from the hole, and while maintaining that position, fill the hole with sand, clay, or other filler 8 as shown in Fig. 4. Place the excess gel in a plastic bag 2
The blasting preparation work is completed when the air is completely expelled from the blast hole 1.

After the preparation work is completed, if the dynamite 3 is ignited through the fuse 3c, the rock E will explode into the explosion hole 1 according to the explosive energy of the dynamite 3.
It is crushed in a specific area centered on .

At this time, in the conventional ABS construction method, the explosion energy is reduced by the presence of an air layer in the gap between the pipe and the guide hole 1, but in the present invention, there is no air layer at all. Moreover, since the dynamite 3 and the water-absorbing polymer 4 are stored in the plastic bag 2, the preparation work is not only simplified compared to the case where the dynamite 3 is installed in a separate process, but also the plastic bag 2 There is no problem that the outer surface of the plastic bag 2 is difficult to adhere to the outer surface of the dynamite 3 etc. and air tends to remain there, unlike when the dynamite 3 or the water-absorbing polymer 4 is placed outside.

Therefore, the explosion energy acts perpendicularly to the hole wall of the explosion hole 1 through the water-absorbing polymer and water gel, and efficiently propagates as a cylindrical wave, preventing loss of crushing energy. At the same time, a small amount of explosives provides an efficient crushing effect.

Furthermore, in the event of an explosion, the plastic bag burns, but since it is made of polyethylene and is a thin material, no strange odor or toxic gas is generated.

Furthermore, since a water-absorbing polymer is stored inside the bag, it retains the injected water without causing it to fall, so even if the opening is lower than the location where the explosive is installed and the explosion hole is slanted, The construction method can be easily implemented.

<<Effects>> As explained in detail in the examples above, according to the blasting method of the present invention, the flexible bag expands due to the swelling of the water-absorbing polymer due to the supply of water and the action of absorbing and retaining water. However, regardless of the shape of the blast hole, it is firmly attached to the hole wall, so the air inside the blast hole is completely expelled, and energy loss factors can be completely eliminated. Furthermore, since the blasting preparation work can be carried out in accordance with the above-mentioned procedure, the assembly and preparation work are also simple and highly efficient. Furthermore, there is no risk of odor or toxic gas being generated due to combustion during an explosion.

Therefore, the blasting method of the present invention can be used as a construction method with lower noise, lower vibration, and fewer flying stones than conventional methods, and is useful for demolishing concrete buildings and crushing rock.

[Brief explanation of drawings]

1 to 4 are explanatory sectional views showing blasting preparation work according to the present invention. E...Bedrock, 1...Explosion hole, 2...Plastic bag (flexible bag), 3...Dynamite (explosive), 3
c...Fuse wire, 4...Water-absorbing polymer, 8...Filling material.

Claims (1)

[Claims] 1. A flexible bag containing explosives and a water-absorbing polymer is inserted into a pre-drilled explosion hole, water is injected through the opening of the bag, and the water is absorbed and retained by the water-absorbing polymer. The bag is swollen while retaining water as a result of the action, and the bag is brought into close contact with the wall of the blast hole, and then the opening of the blast hole is closed, and the explosive is then passed through the fuse led out from the bag. A blasting method characterized by igniting.