JP2832500B2 - Bench blasting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for blasting explosives in a blasting method using explosive destruction force in civil engineering and construction.

[0002]

2. Description of the Related Art Conventional explosive blasting methods include a method in which a bulk ANFO explosive is allowed to flow naturally into a bench or a hole and uniformly or dispersedly charged, and tamping is performed with sand or the like. There is known a method of dropping the inside and sealing with sand tamping or the like. Also, this kind of explosive blasting method
Japanese Unexamined Patent Publication No. Sho 62, for explosive containers and blast holes
No.-123300, Japanese Utility Model Publication No. 49-140401
, JP-A-4-124600, JP-A-49-84
No. 006 is known.

[0003]

In the conventional blasting method,
In the case of a water hole or in a drill hole (blast hole), low-cost bulk ANFO and non-waterproof cartridge explosives could not be used. In the former blasting method, the diameter becomes the same from the upper layer to the lower part of the bench according to the bit diameter due to the nature of the drilling machine. It was difficult to optimize the middle and upper explosive layers, and it was not possible to adjust the diameter of the lower and upper layers of the bench. As a result, there was a problem that the upper layer of the bench was overcharged. In general, a large explosive destruction force is required in order for a rock load to be increased below a bench.

In the latter conventional blasting method, a gap is formed between the cartridge explosive and the hole wall of the drilling hole (blasting hole), which acts as an air cushion at the time of blasting, thereby increasing the loss of blasting energy. In any of the conventional blasting methods, a large lump remains in the upper layer of the bench, and there is a problem of secondary crushing and a large amount of blasting vibration and blasting sound.

[0005] The problem to be solved by the present invention is to solve these problems of the prior art, to achieve an effective and uniform crushing force, to suppress blasting dust, blast vibration and blasting sound, and to further reduce blasting noise. It is an object of the present invention to provide a bench blasting method that allows safe and convenient use of costly explosives.

[0006]

The gist of the present invention to solve the above problems is as follows: 1) A blast hole wall and a cylindrical waterproof high-pressure molded paper tube.
Blast blasting method characterized by blasting in a state in which gel water is filled in the gap between the explosive container loaded with the explosive and the entire blast hole 2) A cylinder whose surface is waterproofed by being coated with an antistatic film The explosive container made of a high-pressure molded paper tube is inserted into the blast hole, the explosive is charged through the opening of the explosive container, the opening is sealed with a waterproof cap, and the explosive container is then inserted into the blast hole. Bench blasting method characterized by submerging in place, filling the entire blast hole with gel water, and then blasting 3) Manufacture by impregnating a waterproof liquid into a cylindrical high-pressure molded paper tube
Put the explosive container into the blast hole, charge the explosive from the opening of the explosive container, seal the opening with a waterproof cap, then sink the explosive container into the predetermined position in the blast hole, blast the gel water Bench blasting method characterized in that the entire pores are filled and then blasted. 4) Gel water mainly comprising a water-absorbing polymer.
3. A bench blasting method according to any one of (3).

[0007]

According to the present invention, the gel water is filled between the charged explosive and the blast hole wall. Therefore, the shock wave at the time of blast propagates this gel water with less energy loss, and spreads on the entire circumference of the hole wall and all inner surfaces of the upper and lower sides. Strong and uniform impact pressure / gas pressure acts. Therefore, an uncrushed large lump does not occur at the upper part.

[0008] Since the gel water is used, the inside of the blast hole can be reliably filled without flowing out from the small hole of the crack on the hole wall. In addition, since the gel water is present on the outer periphery of the explosive, the blast dust is trapped in the gel water, and settles quickly, so that scattering of the blast dust can be greatly reduced. Further, the blast vibration and the blast sound can be suppressed low by the uniform application of the pressure.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway front view showing an explosive container of the present embodiment.
FIG. 2 is an explanatory view showing the explosive and filling step of the embodiment.

An explosive container 1 for filling an explosive of the present embodiment.
Wraps a cord 4 having a thickness of 0.7 mm and a tensile strength of about 60 kg and a width of about 12 mm from the top to the bottom of a bottomed high-pressure molded paper tube 2, and wraps them in an antistatic reinforced polytube 3. This is a cylindrical structure in which the polyethylene film is heated and shrunk to make the polyethylene film adhere to the surface of the high-pressure molded paper tube 2 to be waterproof. The string 4 is pressed against the surface of the high-pressure molded paper tube 2 due to the contraction of the reinforced polytube 3 so as not to move, so that the explosive container 1 can be suspended. A waterproof cap 6 for sealing the opening 5 at the upper part of the explosive container 1 is a lid with a flange integrally molded with plastic and is fitted to the opening 5, and a blasting lead wire 7 is provided at the center.
Is penetrating.

In this embodiment, the explosive container 1 is slightly lowered and lowered in the blast hole 8 by using the string 4, an appropriate amount of sand (cutting powder) 9 is injected from the opening 5, and the explosive material 10 is placed thereon. It is charged (see FIG. 2A). Next, the waterproof cap 6 is fitted into the opening 5 to be sealed, and is sunk deeply into the lower portion of the blast hole 5 using the string 4 (see FIGS. 2B and 2C). Thereafter, the explosive container 11 having the same structure as that described above is hung a little in the blast hole 8 with the string 12 and filled with the explosive material 10 (see FIG. 2 (d)). It is lowered so as to come in contact with the previously sunk explosive container 1, and then water 18
And a gel powder 14 containing a water-absorbing polymer as a main component are introduced into the blast hole 8 to generate gel water 15 in the blast hole 8, and the outer periphery of the explosive containers 1, 11 and the entire inside of the blast hole 8 are filled with the gel water 15. (See FIG. 2E). Thereafter, the explosive containers 1 and 11 are exploded with the lead wire. Since the two explosive containers 1, 11 are in contact, they explode and explode at the same time. Here, in addition to the dust explosion shown in FIG. 2 (e), sand was put into the lower part of the second explosive container 11, the explosive material 10 was charged thereon, the waterproof cap 13 was placed, and then the water was sunk first. The first explosive container 1 may be suspended at a position slightly above the explosive container 1, and the blast hole may be filled with the gel water 15 in this state (see FIG. 2 (f)). In this case, the explosive material can be dispersedly charged.

In the state shown in FIGS. 2E and 2F, it is ignited by a lead wire and blasted. The explosive force intervenes with the gel water, and uniform and strong impact pressure / gas pressure acts on the inner peripheral wall of the entire blasting hole 8 to crush evenly without leaving large lumps. Reduce vibration.

In the present invention, the explosive material can be easily non-uniformly dispersed in the vertical direction, and even if the outer diameter of the explosive container changes, the outer periphery of the explosive container is filled with gel water. Can be maintained.

The explosive container 16 shown in FIG. 3 is an example in which a high-pressure molded paper tube 2 is impregnated with a waterproof liquid to make it into a waterproof state.
The string 4 is fixed to the surface of the high pressure molded paper tube 2 by an adhesive tape 17. This can be the same as the explosive containers 1 and 11 of the above embodiment.

[0015]

As described above, according to the present invention, the impact pressure and gas pressure are uniformly and strongly applied in the blast hole, close to the state in which the explosive is densely packed by the presence of the gel water. Crushing power is high and uniform crushing can be performed without leaving uncrushed large blocks. Reduce the energy loss of explosives,
Explosives can be reduced. In addition, the scattered dust was reduced by 60 to 80%, and the blast vibration and blast sound were also reduced. Moreover, there is an advantage that low-cost explosives can be used safely and simply.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an explosive container according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an explosive charging step of the embodiment.

FIG. 3 is a partially cutaway front view showing another example of the explosive container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Explosive container 2 High pressure molded paper tube 3 Polytube 4 String 5 Opening 6 Waterproof cap 7 Lead wire 8 Blast hole 9 Sand 10 Explosive material 11 Explosive container 12 String 13 Waterproof cap 14 Gel powder 15 Gel water 16 Explosive container 17 Adhesive tape 18 water

Claims (4)

(57) [Claims] 1. A blast hole wall and a cylindrical waterproof high-pressure molded paper tube.
A blasting method wherein the blasting is performed in a state in which the gap and the entire blasting hole with the explosive container loaded with the explosive prepared in the above are filled with gel water. 2. An explosive container made of a cylindrical high-pressure molded paper tube whose surface is covered with an antistatic film and waterproofed is put into a blast hole, and an explosive is charged from an opening of the explosive container. A method for blasting a bench, comprising sealing an opening with a waterproof cap, then submerging an explosive container in a predetermined position in a blast hole, filling the entire blast hole with gel water, and then blasting. 3. A cylindrical high-pressure molded paper tube impregnated with a waterproofing liquid.
Put the explosive container prepared in the blast hole, charge the explosive from the opening of the explosive container, seal the opening with a waterproof cap, then sink the explosive container into a predetermined position in the blast hole, gel A bench blasting method characterized by filling the entire blast hole with water and then blasting. 4. The bench blasting method according to claim 1, wherein the gel water contains a water-absorbing polymer as a main component.