KR0164986B1 - Rock blasting method having no-noise and no-vibration - Google Patents

Abstract

The present invention comprises the steps of drilling a hole (2) with a predetermined diameter (D) and depth (H) in the rock (1), installing a gunpowder (3) and a primer (4) at the bottom of the hole (2), explosives Filling the earth and sand (5) to a certain depth above, filling up to the top of the hole (2) with a curable resin solution (6) to absorb vibrations and noises during blasting, and connected to the primer (4) of the gunpowder (3) It relates to a vibration-free and noise-free rock blasting method characterized by consisting of a rock crushing step of exploding the gunpowder (3) by crushing the rock (1) by applying an electric current to the wire (7).

Description

Vibration-free and noise-free rock blasting method

1 is a schematic view of a rock blasting device installed in a hole drilled in a rock to carry out the method of the present invention.

* Explanation of symbols for main parts of the drawings

1: rock 2: hole

3: gunpowder 4: primer

5: earth and sand layer 6: curable resin layer

7: wire 8: power

D: diameter of hole H: depth of hole

The present invention relates to a vibration-free and noise-free rock blasting method. More specifically, the present invention relates to a vibration-free and noise-free blasting method that removes vibration and noise by using a curable resin solution when blasting rocks or underground obstacles using gunpowder.

Construction and civil engineering are the main industries of the country, and as the industry develops, the scale and number of constructions increase significantly. Accordingly, as a foundation for carrying out such construction and civil works, obstacles such as rock and existing buildings are removed. Or blasting, such as drilling underground tunnels, is one of the most frequent processes at construction and civil engineering sites. Such blasting works are performed by removing the rocks or other obstacles to be removed using the explosive power of gunpowder. The destructive engineering that blows up and removes high-rise buildings in the city is theoretically and practically at a considerable level. In recent years, the blasting work has been carried out more and more times, and the area of the blasting work has been expanded to the inner city center where various facilities are located within close distance. .

However, when a rock crusher or a blasting explosive is used to remove a rock or drill an underground tunnel, the explosive force of gunpowder to destroy the rock is transmitted to the crushed rock and scattered to a considerable distance with the earth. There is a big problem such as causing great damage to the surrounding objects and damage to nearby workers or pedestrians, and moreover, the blast force transmitted to the inside of rock or earth and sand during the blasting work causes vibration or noise, There are serious problems such as harming the safety of buildings and dwellers and further causing great environmental problems.

In particular, this rock crushing method can be used because the noise and vibration exceed the legally regulated limits when performing underground excavation for building buildings in the city center, excavation for exploiting subway tracks, and destruction of buildings. It may become impossible. For example, according to the Noise and Vibration Control Act and the Enforcement Decree of August 1, 1990, the construction noise regulation standards are regulated to less than 70 Leq dB (A) during the day and less than 55 Leq dB (A) during the day. If present, the construction vibration regulation standards are regulated to be 65Leq dB (V) or less in the daytime and 60Leq dB (V) or less in the residential area.

Therefore, even if a blasting method that effectively exploits the explosive power in the blasting process is developed due to the noise and vibration regulation as described above can not be used in the construction and civil works of the city can be useless. In addition, when the destruction method is used for blasting buildings or structures, it is urgent to develop a method for minimizing noise and vibration during blasting.

In order to solve the problems described above, methods for blasting using vibration-free gunpowder, liquefied compressed gas and shock absorbing units have been proposed, but all of these methods have low crushing efficiency of rock or blasting process. It is complicated and has not been put to practical use. For example, the method of crushing rock using vibration-free powder is a method of using a chemical reaction rather than a physical explosion energy, which has the disadvantage that the rock crushing efficiency is very low.

In addition, in the inventions related to the vibration-free rock blasting method disclosed in Korean Patent Applications Nos. 89-19294 and 90-13179, methods for blasting using liquefied compressed gas and methods for using a shock absorbing unit have been proposed. All of the methods require the hassle of inserting air bags, shock absorbers, shock absorbers, and sealing materials in order for each step, and various materials must be used. There is a situation. In addition, the specification of the inventions are described only for the anti-vibration effect, and there is no information about the configuration of the invention for preventing the noise or the noise-prevention effect and is not mentioned.

The present inventors sought solutions in various ways to solve the problems described above, and as a result, when using the curable resin liquid to blast the rock or underground obstacles using gunpowder can be significantly removed vibration and noise It has been found to complete the present invention.

Accordingly, an object of the present invention is to propose a rock-free blasting method for vibration-free and noise-free rocking to prevent the release of earth and sand due to explosive force and explosion vibration of the gunpowder.

The present invention for achieving this object is the step of drilling a hole in a predetermined diameter and length in the target rock and the step of installing gunpowder and primer at the bottom of the hole, filling the soil to a certain depth above the explosive charge, and during blasting Filling a hole with a curable resin liquid to absorb the vibration and noise of the explosives by applying an electric current to the wire connected to the primer explodes gunpowder to crush the rock.

According to the method of the present invention constituted by the above steps, the noise generated when the explosive is blown up by the fine pores of the curable resin filled in the pores is absorbed, and upon blasting by the firm solid foam of the curable resin As the generated explosive force is blocked from being transmitted to the outside of the hole, the vibration in the blasting area is significantly reduced, and the explosive force generated by the explosive powder is transmitted to the rock in the lower length direction of the hole without any leakage of the explosive force. Since most of the explosive power is used to break the rock, the breaking efficiency of the rock is greatly improved.

In addition, due to the strong adhesion to the wall surface of the curable resin does not leave the resin even after the explosion is increased safety and crushing efficiency.

The present invention composed of the above steps has the advantage that the process is very simple because only the step of adding the curable resin liquid to the blasting process that is generally performed in the existing, there is an obstacle such as rock and existing buildings or underground It can be applied to any blasting process as it can be applied not only to blasting work such as tunneling but also to destructive engineering blasting process that blows up and removes high-rise buildings in the city center.

In addition, according to the method of the present invention, when explosives are exploded, the explosive power is absorbed by the curable resin, so that vibration and noise are blocked. It will not be delivered. Therefore, the blasting process of the present invention has the advantage that it can be used in a variety of blasting process without being limited by the type of gunpowder, and because the noise and vibration generated in the blasting process is significantly less, related laws and regulations including noise and vibration regulation law There is an advantage that the blasting process can be performed in the downtown area without being constrained by.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1 of the present invention, a rock driller drills a hole 2 having a predetermined diameter D and a depth H by using a rock drill. The gunpowder is formed at the bottom of the hole 2. 3) and primer (4). Then, the soil resin 5 is covered with a thickness of about 25 to 35 cm on the upper portion of the explosive to prevent the liquid resin before curing from flowing down into the explosive. Curable resin liquid is curable resin manufactured by mixing 2 or more types of compounds, and has a low viscosity in a liquid state, The kind does not have a restriction | limiting in particular. That is, the curable resin used as the material for filling the holes 2 in the method of the present invention may be any as long as it is a curable resin. However, in order to carry out the method of the present invention preferably used is an epoxy resin and a polyurethane, in the case of this polyurethane, diisocyanate and polyol in a ratio of 1: 1 and sprinkled on the hole about 2 After minutes, it is cured to form a curable resin layer 6, which is a solid foam in a very rigid form with many fine pores.

The above-described process is a process in which a polymerization reaction occurs between two or more compounds introduced into the holes 2 so that the curable resin is produced in the holes 2, for example, when the two compounds are diisocyanates and polyols, respectively. , A process in which a polyurethane is formed by a polymerization reaction between two components to fill a hole (2). At this time, the heat of reaction may be generated by the polymerization reaction between two or more components, which is effectively blocked by the soil layer 5 existing between the gunpowder 3 and the primer 4 and the curable resin layer 6. No problem. In addition, since the two components must be well mixed, the curable resin can be formed evenly throughout the hole 2, so that the two components must be well stirred at the step of injecting the compound into the hole 2.

When curable resin of this invention is polyurethane, one of the compounds mentioned above is the diisocyanate which has an isocyanate group at the terminal, and the other is the polyol which has a hydroxyl group at the terminal.

The diisocyanate used in the present invention is a compound of the general formula O = C = N-X-N = C = O, wherein X is an aliphatic, alicyclic or aromatic radical. Examples of such diisocyanates include methylene diphenyl diisocyanate (MDI), hydrogenated MDI, toluene diisocyanate (TDI), naphthalene diisocyanate, xylylene diisocyanate (XDI), tetramethylene xylene diisocyanate, phenyline diisocyanate, 1 Isocyanatomethyl-3-isocyanato-1,5,5-trimenylcyclohexane (IPDI), hexane-1,6-diisocyanate (HDI), trimethyl hexamethylene diisocyanate, cyclohexane diisocyanate Mention may be made of reactive halogen-containing diisocyanates and diisocyanates containing phosphorus or sulfur, of which methylene diphenyl diisocyanate (MDI) and toluene diisocyanate (TDI) are most preferred.

The polyol used in the present invention is a compound having two or more hydroxyl groups in the molecule, and examples thereof include glycol, glycerol, pentaerythritol, and the like, and polyalkylene glycols, in particular polyethylene glycol and polypropylene glycol, desirable.

The amount of the curable resin solution used once is calculated by multiplying the diameter (D) by half (H / 2) of the depth (H) of the hole (2), and the solid foam is filled up to the upper part of the hole (2). Fine pores of the curable resin layer 6 serves to absorb noise, and the rigid foam serves to block the explosive force from being transmitted to the outside of the hole 2. In addition, since the adhesiveness to the hole (2) and the wall surface is strong, it has an advantage that does not leave after the explosion. When the current is applied from the power source 8 to the primer 4 in such a state of setting, the explosive force generated by the explosive powder 3 is transmitted to the rock 1 as it is, and in the longitudinal direction of the hole 2. The rock 1 will be broken. And, the blasting impact and the noise generated at this time is absorbed by the curable resin layer 6 has a greater effect than when using a vibration-free explosive and can break the rock with a large explosive force.

As described above, according to the present invention, the explosive force of the explosive is transmitted only to the lower side of the hole 2, so that there is no leakage of the explosive force, so that the effect of vibrationless and noiseless can be obtained. In addition, the construction is very simple and can be easily applied at the blasting site.

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.

Example 1

Using a rock drill on the blasting rock, drill a hole with a diameter of 38 mm to 45 mm and a depth of 1.8 to 2 m, and then install gunpowder and a primer at the bottom of the hole. Cover the earth and sand with a thickness of about 30 cm on top of the explosive to prevent the explosive from flowing down the liquid resin before curing. Resin liquid (A) consisting of 100 parts by weight of polymethylene diphenylene diisocyanate (MDI) resin having an isocyanate group content of 30.5 to 31% by weight, and 58.5 parts by weight of polypropylene glycol having a hydroxyl value of 350 to 370, catalyst The resin mixture (B) consisting of 1.2 parts by weight and 2.3 parts by weight of silicone oil starts to harden from the point of mixing to form the curable resin layer 6, and its viscosity is about 3000 cps at 25 ° C. When the resin liquid is introduced into the hole, the mixed liquid is stirred with a straw so that the curable resin can be formed evenly throughout the hole.

After this setting, the current is applied to the primer from the power supply to explode the explosives and break the rock. In order to measure the level of noise and vibration, a noise measuring instrument and a vibration measuring instrument are installed 20 meters from the blasting point, and the noise and vibration at the time of launching are measured. As a result, the noise was 30 Leq dB (A) and the vibration was very low as 20 Leq dB (V).

Example 2

As a component (A) of the curable resin liquid, a resin liquid composed of 100 parts by weight of a polymethylene diphenylene diisocyanate (MDI) resin having an isocyanate group content of 30.5 to 31% by weight is used and is used as a component (B) of the curable resin liquid. Except for using a resin mixture consisting of 114 parts by weight of polypropylene glycol having a siloxane value of 380 to 430, 1.2 parts by weight of catalyst and 2.3 parts by weight of silicone oil, the blasting process was carried out in the same manner as in Example 1, and noise and vibration were measured. Results The same results as in Example 1 were obtained.

Example 3

Toluene diisocyanate (MDI) 50 having 50 parts by weight of polymethylene diphenylene diisocyanate (MDI) resin having an isocyanate group content of 30.5 to 31% by weight as component (A) of the curable resin solution and 48% of an isocyanate group content. Except using a resin solution composed of parts by weight and using a resin mixture consisting of 145 parts by weight of polypropylene glycol having a hydroxyl value of 380 to 430, 1.5 parts by weight of catalyst and 2.9 parts by weight of silicone oil as component (B) of the curable resin solution. As a result of performing the blasting process and measuring the noise and vibration in the same manner as in Example 1, the same results as in Example 1 were obtained.

Example 4

Toluene diisocyanate (MDI) 50 having 50 parts by weight of polymethylene diphenylene diisocyanate (MDI) resin having an isocyanate group content of 30.5 to 31% by weight as component (A) of the curable resin solution and 48% of an isocyanate group content. Except using a resin liquid consisting of parts by weight and using a resin mixture consisting of 75 parts by weight of polypropylene glycol having a hydroxyl value of 350 to 370, 1.5 parts by weight of catalyst and 3.0 parts by weight of silicone oil as component (B) of the curable resin solution. As a result of performing the blasting process and measuring the noise and vibration in the same manner as in Example 1, the same results as in Example 1 were obtained.

Example 5

Toluene diisocyanate (MDI) 50 having 50 parts by weight of polymethylene diphenylene diisocyanate (MDI) resin having an isocyanate group content of 30.5 to 31% by weight as component (A) of the curable resin solution and 48% of an isocyanate group content. Except using a resin liquid consisting of parts by weight and using a resin mixture consisting of 197 parts by weight of polypropylene glycol having a hydroxyl value of 270 to 290, 2.0 parts by weight of catalyst and 4.0 parts by weight of silicone oil as component (B) of the curable resin solution. As a result of performing the blasting process and measuring the noise and vibration in the same manner as in Example 1, the same results as in Example 1 were obtained.

Example 6

Toluene diisocyanate (MDI) 50 having 50 parts by weight of polymethylene diphenylene diisocyanate (MDI) resin having an isocyanate group content of 30.5 to 31% by weight as component (A) of the curable resin solution and 48% of an isocyanate group content. Except using a resin liquid consisting of parts by weight and using a resin mixture consisting of 295 parts by weight of polypropylene glycol having a hydroxyl value of 180 to 200, 3.0 parts by weight of catalyst and 6.0 parts by weight of silicone oil as component (B) of the curable resin solution. As a result of performing the blasting process and measuring the noise and vibration in the same manner as in Example 1, the same results as in Example 1 were obtained.

As described in detail above, according to the method of the present invention, the noise during the blasting process is 30Leq dB (A), which is very lower than the minimum construction noise limit of 55Leq dB (A) in the residential area, and the vibration during the blasting process. This 20Leq dB (V) is much lower than 60Leq dB (V) below the minimum construction vibration regulation in residential areas, and the effect is so excellent that it is not seen in the prior art.

Claims (3)

Drilling a hole (2) in the rock (1) with a predetermined diameter (D) and depth (H), installing a gunpowder (3) and a primer (4) at the bottom of the hole (2); Filling up to the upper part of the hole (2) with a curable resin liquid for absorbing vibration and noise during blasting, and after applying the current to the wire (7) connected to the primer (4) of the gunpowder (3) The vibration-free and noise-free rock blasting method which consists of exploding (3) and crushing the rock (1) with the explosive force. The method according to claim 1, wherein in the step of filling the upper portion of the hole 2 with the curable resin liquid, diisocyanate having an isocyanate group at the terminal and a polyol having a hydroxyl group at the terminal are respectively injected into the hole and mixed in the hole. A vibration-free and noise-free rock blasting method characterized by the reaction between these compounds to form a curable resin layer (6). The vibration-free and noise-free rock blasting method according to claim 2, wherein the curable resin layer (6) is made of polyurethane.