KR20160116810A

KR20160116810A - Blasting method for preventing transmission of vibration and noise using grouting in boring hole

Info

Publication number: KR20160116810A
Application number: KR1020150045096A
Authority: KR
Inventors: 박종오; 고병수
Original assignee: 영인산업 주식회사; 에스알에스건설(주)
Priority date: 2015-03-31
Filing date: 2015-03-31
Publication date: 2016-10-10

Abstract

The present invention relates to a vibration and noise control blasting method using a grouting method in a charge hole.
The vibration and noise control blasting method using the grouting method in the charge hole of the present invention includes a charge setting step of installing a charge capsule 10 in which a charge 12 is installed in the charge hole 1; A grouting step of forming a grouting layer (20) by grouting the inside of the charge hole (1) with a composite grout made of a mixture of an elastic material, a binder and an expanding agent; And a blasting step of blasting the charged drug (12) to blast it.
According to the present invention, in consideration of the fact that the material of high elasticity accelerates the propagation speed of the compressed wave, the elastic material is used as a component of the composite grout, so that the pressure wave at the time of blasting is horizontally It is possible to increase the fracture efficiency of the rock mass by generating stress cracks in the surrounding rock by the expansion displacement by the transfer of the stress, and the expansion agent which is a component of the composite grout agent as the part where the stress of the charge hole is weak due to the expansion pressure generated during the grouting The fracture of the rock can be increased through cracks when the charge explosion is induced by expanding the crack, and the composite grout used in the existing method is filled with the composite grout so that the shock wave can not be transmitted to the free surface Noise can be reduced.

Description

TECHNICAL FIELD [0001] The present invention relates to a blasting method for preventing vibration and noise in grouting,

The present invention relates to a blasting method, in which grouting is performed inside a charge hole, and the grout is expanded by exposing the charge to generate displacement in the surrounding rock, thereby minimizing vibration and noise, The present invention relates to a vibration and noise control blasting method using a grouting method.

Blasting is the process of bombarding concrete structures or rocks. Typically, a puncture machine or the like is used to form a charge ball on a rock, and then explosives are added to the rock.

However, the blasting work involved a large explosion noise and vibration, which could cause damage to the hearing and damage to surrounding structures.

Also, the destroyed rocks scattered and could damage nearby houses and crops.

In order to solve such a problem, a "method of rock cracking using a gel tube" (Korean Patent Registration No. 10-329579, Patent Document 1) discloses a method of inserting a first gel tube filled with a high-viscosity liquid into a hole formed in a rock, Next, a second gel tube filled with a high-viscosity liquid is inserted into the hole of the rock so that the explosive having a primer is inserted into the hole of the rock so as to be closely contacted with the first gel tube, to be.

This method is to cause the viscous liquid in the gel tube to rupture while pushing the inner surface of the rock hole when the explosive is blown.

Compared with the conventional method in which the explosion pressure is directly transmitted to the hole, the noise and vibration are reduced and the scattering of rock and the like due to the explosion is also reduced.

However, this method can reduce blasting noise and vibration, but since the liquid absorbs vibrations and impacts, there is a limit to increase the blasting energy.

As a technique for solving such a problem, a "blasting charging unit and a blasting method using the same" (Korean Patent Registration No. 10-1212605, Patent Document 2) discloses a method of inserting a metal cell and a liquid cell into a charge- When the explosion occurs, the metal cells of the charging unit are exploded together to amplify the blasting energy, and the blasting energy is transmitted to the inner surface of the charging hole through the buffer solution, thereby reducing noise and vibration and reducing rock scattering.

However, since the impact energy generated at the time of blasting is very high, the noise and vibration that can be absorbed by the liquid cell are very small, so that the noise and vibration reduction effect of Patent Document 2 is insufficient.

KR 10-0329579 (Mar. 3, 2002) KR 10-1212605 (2012.12.10)

The vibration and noise control blasting method using the grouting method in the charge hole of the present invention is intended to solve the problems occurring in the related art as described above, Is grouted with a composite grout made of a mixture of an elastic material, a binder and an expanding agent, and then subjected to an exploration, thereby achieving an excellent blasting effect with less load than in the prior art.

Considering that the material with high elasticity accelerates the propagation speed of the compression wave, it uses the elastic material as a component of the composite grout to transmit the stress in the horizontal direction by the composite grout wrapping the pressure wave during the blasting The cracks in the surrounding rocks are generated by the expanded displacements.

In addition, the inflating agent, which is a component of the composite grout, is inflated to induce cracks in the portion where the stress of the charge grout is weak due to the expansion pressure generated during the grouting, so that the fracture efficiency of the rock through the crack will be.

In addition, the composite filling material used in the existing method is filled with the composite grout so that the shock wave can not be transmitted to the free surface, thereby reducing the noise.

More specifically, through the use of a composite grout, it is possible to maximize the blasting force against the same charge by causing the occurrence of pre-cracking in the charge hole not at the time of explosion but at the time of grouting, The inner working pressure and the kinetic energy are transferred to the grouting layer through the installed air or liquid, and the grouting layer expands and breaks by the transfer of energy to generate displacement in the surrounding rock mass, So that the grouting layer is sealed to minimize the external transmission of the shock wave.

In order to solve the above-mentioned problems, the vibration and noise control blasting method using the grouting method in the charge-discharge hole of the present invention is characterized in that the charge capsule 10 in which the charge 12 is installed is installed in the charge- A charge setting step; A grouting step of forming a grouting layer (20) by grouting the inside of the charge hole (1) with a composite grout made of a mixture of an elastic material, a binder and an expanding agent; And a blasting step of blasting the charged drug (12) to blast it.

In this configuration, the elastic material may include any one selected from urethane, epoxy, and silicone, and the binder may include any one selected from micro cement and quick cement, and the inflator may include any one selected from quicklime and bentonite .

The charge capsule (10) has a case (11) having a smaller outer diameter than the inner diameter of the charge hole (1); (12) installed inside the case (11) so that the outer circumferential surface is spaced apart from the inner circumferential surface of the case (11); And an accommodating portion 13 formed inside the case 11 to surround the charged medicament 12 and containing air or liquid therein.

The composite grout is composed of 100 parts by weight of urethane rubber as an elastic material, 100 to 300 parts by weight of cement based on 100 parts by weight of the urethane rubber as a binder, and 100 to 300 parts by weight of bentonite based on 100 parts by weight of the urethane rubber .

In addition, the grouting step may be performed while the upper part of the charge hole 1 is hermetically closed, and the blasting step is performed after completion of hardening of the composite grout.

According to the present invention, in consideration of the fact that the material of high elasticity accelerates the propagation speed of the compressed wave, the elastic material is used as a component of the composite grout, so that the pressure wave at the time of blasting is horizontally It is possible to increase the fracture efficiency of the rock by generating stress cracks in the surrounding rock by the expanded displacement.

In addition, the inflating agent, which is a component of the composite grout, inflates and induces cracks in the portion where the stress of the charge grout is weak due to the expansion pressure generated in the grouting, thereby improving the fracture efficiency of the rock through the crack during charge explosion .

In addition, the composite grout used in the existing method is filled with the composite grout, so that the shock wave can not be transmitted to the outside of the free surface, so that the noise can be reduced.

More specifically, through the use of a composite grout, it is possible to maximize the blasting force against the same charge by causing the occurrence of pre-cracking in the charge hole not at the time of explosion but at the time of grouting, The inner working pressure and the kinetic energy are transferred to the grouting layer through the installed air or liquid, and the grouting layer expands and breaks by the transfer of energy to generate displacement in the surrounding rock mass, The grouting layer is sealed to minimize the external transfer of the shock wave.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view sequentially showing an embodiment of a vibration and noise control blasting method using a grouting method in a charge hole of the present invention; FIG.
2 is a cross-sectional view showing still another embodiment of the vibration and noise control blasting method using the grouting method in the charge hole of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a vibration and noise control blasting method using a grouting method in a charge hole of the present invention will be described in detail with reference to the accompanying drawings.

1. Installation phase

As shown in Fig. 1, the charge capsule 10 is installed in the charge hole 1. As shown in Fig.

The charge capsule 10 is internally provided and may be composed of a case 11, a charge 12, and a receiver 13 as shown in FIG.

The case 11 is made of a synthetic resin such as polyethylene, polypropylene, polyester, or the like, which is smaller in outer diameter than the inside diameter of the charge hole 1. [

The charge 12 is provided inside the case 11 so that the outer circumferential surface thereof is spaced apart from the inner circumferential surface of the case 11.

The receiving part 13 is formed inside the case 11 while enclosing the charge 12, and air or liquid can be received therein.

The air or liquid contained in the accommodating portion 13 not only serves to suppress noise as in the prior art but also receives the internal pressure and kinetic energy generated when the charge 12 explodes, Thereby generating a line crack in the surrounding rock as much as the displacement due to the expansion of the grouting layer 20.

2. Grouting step

A grouting layer 20 is formed by grouting the inside of the charge hole 1 with a composite grout made of a mixture of an elastic material, a binder and an expanding agent.

The elastic material may be composed of any one selected from urethane rubber, epoxy, and silicone, or a mixture thereof.

The binder may be composed of any one selected from micro cement and quick cement, or a mixture thereof.

The expanding agent may be composed of any one selected from quicklime and bentonite, or a mixture thereof.

The use of an elastic material such as urethane rubber, epoxy, or silicone is advantageous in that the elastic material absorbs the noise, and the compressed wave is propagated in a material having a high elasticity, Layer 20, it is possible to improve the fracture efficiency of the rock by making it possible to expand the binder, the swelling agent, etc. contained together.

The expanding agent is a volumetric expansion effect due to the normal digestion reaction, and it gives the expansion pressure when grouting is performed.

Thus, cracks can be generated in the portions where the strength of the inside of the charge hole 1 is weak only by pre-blasting grouting.

Therefore, it is preferable that the grouting step is carried out in a state where the upper part is hermetically sealed by using a sealing means 30 such as a press as shown in the drawing of the charge hole (1).

The binder is a component that integrates the elastic agent and the swelling agent and is combined with water to increase the viscosity and generate heat during the curing process.

The elastic material, the swelling agent, and the binder may be prepared by mixing 100 parts by weight of urethane rubber as an elastic material, 100-300 parts by weight of cement based on 100 parts by weight of the urethane rubber as a binder, 100-300 parts by weight of 100 parts by weight of the urethane rubber Bentonite showed higher noise suppression and blasting effect.

The weight of water added to the composite grout may be 100-300 parts by weight based on 100 parts by weight of the urethane rubber.

3. Blasting phase

The charge 12 is detonated and blasted.

Blasting can be carried out before the curing of the composite grout is finished, or after complete curing, depending on the characteristics, strength and cracking degree of the rock.

When the initial viscosity is low, the viscosity is low, and since the viscosity is low due to the infiltration into the surrounding rock mass due to the expansion, it is cured at room temperature for at least 2 hours and evaporation of water It is preferable to proceed in a state in which the viscosity is increased. The lower the hardness of the surrounding rock mass or the more the crack, the more the curing can be performed before the curing is completed.

In the embodiment of FIG. 1, the depth of the charge hole is almost the same as the height of the charge. In the embodiment of FIG. 2, the charge is placed in the deep portion of the charge hole.

In the case of FIG. 1, there is no significant difference in the pressure generated in the curing process of the grouting layer 20 according to the height of the charge hole, so that the cross section of the blasting hole 40 is not changed. However, When the charge is deeply inserted, the depth of the grouting layer 20 is deepened, and the expansion pressure generated in the curing process varies depending on the height.

That is, at deep depth, the expansion pressure of the grouting layer becomes larger, which causes it to dig deeper into the surrounding rock.

As a result, the blasting force is increased at the deep portion in the blasting process, and the shape of the blasting hole 40 is changed.

Therefore, according to the present invention, it is possible to induce active blasting in the deep portion by using the pressure generated according to the curing of the grouting before blasting according to the depth of the charge hole, the depth of the grouting layer in the charge hole, .

Hereinafter, the present invention will be described in more detail with reference to examples, but the scope of the present invention is not limited thereto.

1. Example 1

A stick-shaped charge was placed at the inner center of a cylindrical polypropylene case having a diameter of 30 mm, and a primer was provided on the upper part.

The loading capsule was inserted into the rock bed to be blasted using a rock drill, and a 50 mm diameter and 2 m depth was buried.

1: 3: 1: 1 mixture of urethane rubber, quick cement, bentonite, and water is prepared in the above-mentioned charge hole to prepare a liquid grout solution, and then the upper part of the charge hole is pressed by a press so that the grout solution can not be discharged to the outside I blocked it.

The grout solution was cured to form a grouting layer, and then a current was applied to the primer to explosively charge the rock mass.

In order to measure the degree of noise and vibration, a noise meter and a vibration meter were installed at a point 20 m from the blasting point, and noise and vibration at the time of blasting were measured.

As a result, the noise was 27 leq dB (A) and the vibration was very low at 19 leq db (V).

2. Example 2

Proceeding in the same manner as in Example 1, an air tube filled with air inside was wrapped around the stick, and charged capsules were prepared and tested in the same manner.

As a result, 25 leq db (A), the vibration was also very low at 17 leq db (V).

3. Comparative Example 1

Proceeding as in Example 1, a blasting experiment was performed without grouting around the charge capsule.

As a result, the noise was 65 leq db (A) and the vibration was 67 leq db (V).

4. Comparative Example 2

The same procedure as in Example 2 was carried out. At this time, blasting experiments were performed without grouting.

63 leq db (A) and the vibration was also very high at 62 leq db (V).

As can be seen from the examples and comparative examples, the vibration and noise control blasting method using the grouting method of the present invention has the advantage that the vibration and noise can be prevented Can be suppressed.

1: charge ball 10: charge capsule
11: Case 12: charge
13: accommodating portion 20: grouting layer
30: sealing means 40: blasting hole

Claims

In the blasting method,
A loading step of installing a loading capsule 10 in which a loading container 12 is installed in the loading container 1;
A grouting step of forming a grouting layer (20) by grouting the inside of the charge hole (1) with a composite grout made of a mixture of an elastic material, a binder and an expanding agent;
And a blasting step of blasting the charged drug (12)
Vibration and Noise Control Blasting Method Using Grouting Method in Box.

The method according to claim 1,
The elastic material includes any one selected from urethane, epoxy, and silicone
Wherein the binder comprises one selected from the group consisting of micro cement and quick cement,
Characterized in that the swelling agent comprises any one selected from quicklime and bentonite.
Vibration and Noise Control Blasting Method Using Grouting Method in Box.

3. The method of claim 2,
The charged capsule (10)
A case 11 having an outer diameter smaller than an inner diameter of the charge hole 1;
(12) installed inside the case (11) so that the outer circumferential surface is spaced apart from the inner circumferential surface of the case (11);
And a receiving part (13) formed inside the case (11) and enclosing the charge (12) and containing air or liquid therein.
Vibration and Noise Control Blasting Method Using Grouting Method in Box.

4. The method according to any one of claims 2 to 3,
The composite grout is composed of 100 parts by weight of urethane rubber as an elastic material, 100 to 300 parts by weight of cement based on 100 parts by weight of the urethane rubber as a binder, and 100 to 300 parts by weight of bentonite based on 100 parts by weight of the urethane rubber &Lt; / RTI >
Vibration and Noise Control Blasting Method Using Grouting Method in Box.

5. The method of claim 4,
The grouting step is performed while the upper part of the charge hole 1 is hermetically sealed,
Characterized in that said blasting step proceeds after curing of the composite grout is completed.
Vibration and Noise Control Blasting Method Using Grouting Method in Box.