KR100653616B1 - Method and device for decreasing blasting noise - Google Patents

Abstract

A blasting noise decreasing method which enables installation and dismantling to be easily performed, minimizes noise pollution by vanishing and relieving energy of blasting wind pressure to the utmost, and secures safety of blasting operation and improves construction proceeding efficiency by certainly blocking flying fragments, and a blasting noise decreasing device used in the same are provided. A device for decreasing blasting noise comprises: a blocking wall(10) vertically installed on a proceeding path of blasting wind pressure to block proceeding of the blasting wind pressure; a plurality of noise pipes(20) having a cylinder(21) of which one end is opened, and which has a plurality of openings on a circumferential surface thereof, a piston(22) received in the cylinder, and a compression spring(23) for elastically biasing the piston toward the openings of the cylinder, wherein the openings of the cylinder are arranged on an inner surface of the blocking wall such that the openings are directed toward a blasting position; a first porous acoustic material(30) for surrounding the respective noise pipes except openings of the noise pipes; and a wire net(40) vertically formed at the opening side of the noise pipes to block flying fragments during blasting operation.

Description

Method and device for blasting noise reduction {Method and device for decreasing blasting noise}

1 is a front view schematically showing a state in which a blast noise reduction apparatus according to the present invention is installed at a tunnel entrance;

FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1;

Figure 3 is a partially cut perspective view showing the module of the blast noise reduction device of the present invention,

4 is a cross-sectional view taken along line IV-IV of FIG. 3;

5 is an exploded perspective view showing the sound pipe of the present invention;

6 is a cross-sectional view of the coupled state of FIG.

7 is a cross-sectional view for explaining the operation principle of the sound pipe;

8 is a partially cutaway exploded perspective view illustrating a vacuum blocking plate of the present invention;

9 is a cross-sectional view of the coupled state of FIG.

<Description of the symbols for the main parts of the drawings>

10: barrier wall 12: vacuum cavity

13: third porous sound absorbing material 15: porous noise stopper

20: sound tube 21: cylinder

22: piston 23: compression spring

24: inner tube 24a: pore

25: second porous sound absorbing material 26: appearance

26a: Pore 30: First porous sound absorbing material

40, 41: wire mesh 50: fourth porous sound absorbing material

60: module 61: cube frame

70: base T: tunnel

The present invention relates to a method and apparatus for reducing the blasting noise generated during blasting work, and in particular, the blasting noise proceeding in the form of a pressure wave (shock wave) is first converted into mechanical kinetic energy and then used to exhaust excess noise. A method and apparatus for reducing blast noise, which is alleviated by diffraction and resonance, and blocks the path of blast noise with a vacuum wall, thereby minimizing the transmission of explosion noise to minimize noise damage and prevent environmental pollution. will be.

With the development of industrial society, large-scale civil engineering works such as roads, railways, dams, subways, and underground storage are being carried out. These civil engineering works are accompanied by blasting works using explosives to remove rocks.

Especially in the case of the underground tunnel excavation and tunnel excavation for the subway or underground storage, the blasting proceeds a large number of times, and the explosion that occurs is one of the important disasters around the work site along with the blasting vibration. Moreover, in recent years, such blasting is also frequently performed in the city center or in the vicinity of a residential area, which is a serious problem.

On the other hand, blasting noise refers to a wave having a frequency of an audible region heard by a human ear among waves propagated with air as a medium. However, even low-frequency vibrations that are not audible are not audible to the human ear, but are more dangerous than vibrations in the audible region because the building vibrates to generate secondary noise or cause cracking. The noise in the audible region and the low frequency waves are referred to as "blast blast pressure" (hereinafter referred to as 'blast pressure') because the noise appears in the form of overpressure in the air.

In particular, in tunnel blasting, due to its structural characteristics, the explosion caused by a certain space is very large, which causes considerable displeasure and property damage to nearby residents, causing a lot of complaints.

In other words, in the case of tunnel blasting, the rock of a limited free surface surrounded by rock is blasted, so the unit dose is used two to three times higher than the blasting in the open air, especially in the case of the center cut, to form a free surface. As the unit dose is charged up to about 0.6 ~ 2.0㎏ / ㎥ (about 3 ~ 4 times of the general blasting), the explosion sound of the membrane face that is blocked in all directions proceeds along the space of the tunnel and is concentrated and ejected toward the shaft.

Therefore, about 160 ~ 170㏈ (L) of cracking (window cracking, door frame twisting) occurs in the vicinity of the shaft 100m or more away from the blasting place in the tunnel, and it is only about 6㏈ even if the distance is more than doubled. As there was no reduction effect of the oppression such as not diminishing, the windows of the residential area hundreds of meters away were sounded and the buildings were vibrated, causing a strong repulsion of the residents and causing construction interruptions.

The most important thing to reduce noise in blasting is to improve the blasting method in the noise source, and secondly to block and install the soundproof door in the shaft. There is a limit to improvement in nature.

Accordingly, in the conventional tunnel construction, a method such as fixing a thick sponge or a nonwoven fabric to a shaft part to a steel structure to block the tunnel entrance or to build up a pile of soil to induce the direction of noise in the direction of no complaints.

However, not only was the steel structure and non-woven fabric firmly fixed, but also it was not enough to block and relieve the enormous pressure of the energy, and the safety problems occurred such as the falling out of the structure due to the pressure of the blasting work. Even if a pile of soil is changed to change the direction of the tyranny, it still affects the civil affairs area due to the reflection and scattering of the tyranny hit by the pile of dirt, and it also restricts the passage of equipment and vehicles and narrows the construction site. There was a problem.

In addition, recently, in order to protect the fixed structure, some doors have been tied up slightly to open automatically by pressure, or non-woven fabrics are suspended like curtains. 1 / 1,000 seconds), because the pressure was exposed to the outside between the open doors and the gaps between the open curtains, it was not possible to take corrective measures.

In addition, the Republic of Korea Utility Model Registration No. 0305672 proposes a technology in which a barrier wall with a soundproof door is installed in the shaft of a tunnel, which consists of a double wire mesh, a double short concrete layer and a nonwoven fabric layer in a frame. Although it is solid, installation is very complicated, such as concrete pouring, and it is difficult to alleviate the blasting noise sufficiently because the pressure is discharged through the ventilation hole.

The present invention was devised in view of the above-mentioned conventional problems, and is easy to install and dismantle, while being able to minimize the noise pollution caused by the blast by mitigating the energy of the blast wind pressure accompanying the blasting operation as much as possible. The purpose is to provide a method for reducing blast noise to ensure the safety of blasting work by improving the efficiency of construction work.

Another object of the present invention is to provide a blast noise reduction device suitable for implementing the above-described method.

In order to achieve the above object, the blasting noise reduction method according to the present invention primarily disperses the blasting wind pressure generated during the blasting operation to a plurality of piston means to exhaust some of the mechanical kinetic energy by the compression action of each piston, The excess noise energy exhausted by the kinetic energy is passed through the porous member having a myriad of fine pores to exhaust the thermal energy by physical diffraction and resonance, and the path of the blast wind pressure is structurally blocked by the wall. do.

According to one preferred feature of the blast noise reduction method of the present invention, the entire apparatus including the wall and the piston means and the porous member is installed in a flow structure so that the entire apparatus is pushed backward by the blast wind pressure, so that the blast wind pressure together with the piston means. Part of is exhausted with mechanical kinetic energy.

In addition, the blasting noise reduction device for achieving the above object is a vertical wall is installed vertically on the traveling path of the blast wind pressure blocking the progress of the blast wind pressure; It has a cylinder having one end open and a plurality of pores on the main surface, a piston accommodated inside the cylinder, and a compression spring for biasing the piston toward the opening of the cylinder, with the opening of the cylinder facing the blast point. A plurality of sound pipes arranged to be fixed to the inner side of the barrier wall to be arranged; A first porous sound absorbing material surrounding each sound tube except for its opening; And a wire mesh screen positioned vertically to the openings of the sound pipes to block debris scattered during the blasting operation.

According to one preferred feature of the blasting noise reduction device of the present invention, the cylinder of the noise tube has a plurality of pores in the main surface and the rear end thereof to accommodate the piston and the spring, and the second porous body surrounds the inner tube except for the opening. The sound absorbing material has a plurality of pores on its main surface, and the outer porous sound absorbing material surrounds the second material.

According to another preferred feature of the blast noise reduction device of the present invention, the blocking wall is formed into a hollow having a cavity therein, and the cavity is evacuated by vacuum.

According to another preferred feature of the blasting noise reduction device of the present invention, each component including a blocking wall is provided on a base slidable with respect to the ground, and is configured to retreat by blasting wind pressure.

According to another preferred feature of the blast noise reduction device of the present invention, a predetermined number of noise tubes, a first porous sound absorbing material, and a barrier wall are accommodated and mounted in a support frame on a cube in which each side is opened, and at least the front surface of the support frame. Wire meshes are installed on the rear and rear surfaces, respectively, to form a plurality of unit modules, and then each module is connected by a matrix.

Accordingly, the present invention, because the blast wind energy generated during the blasting work is sequentially exhausted in a plurality of stages by mechanical kinetic energy and physical thermal energy can minimize the noise pollution due to the blasting, especially tunnel construction that is a lot of explosive charges Suitable for

In addition, the rock fragments scattered during blasting can be reliably blocked, as well as the installation and dismantling of the blasting site is very easy.

Therefore, the present invention, as well as improving the reliability of the blasting work and the construction progress efficiency, will have a great effect on securing safety and shortening the air.

Such specific features and other advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings, hereinafter will be described taking the case of the present invention applied to the tunnel construction as an example.

1 to 4, the blasting noise reduction device 1 according to the present invention includes a blocking wall 10 which is provided perpendicular to the shaft portion of the tunnel T to shield the shaft portion, and the blocking wall 10 A plurality of sound pipes 20 are fixed to the inner surface of the tunnel T so that the openings are directed toward the blasting point so as to exhaust part of the blast wind pressure with mechanical kinetic energy, and the sound pipes 20 are excluded from the openings. Wire mesh to block the debris that is scattered when blasting is located perpendicular to the opening of the first porous sound absorbing material 30 and the sound pipe 20 to exhaust the surplus noise energy exhausted by kinetic energy to physical thermal energy ( 40).

The blocking wall 10 is composed of a metal plate having an appropriate thickness, and has an arc shape corresponding to the cross section of the tunnel T. As shown in FIGS. 8 and 9, the inner surface 11 of the blocking wall 10 to which the sound pipes 20 are mounted has a predetermined curvature so as to efficiently collect (induce) the sound source into the blocking wall 10. It has a concave curved surface (parabolic).

This barrier wall 10 is preferably formed hollow with a cavity 12 therein, which is evacuated to a vacuum through an exhaust valve (not shown). This is to fundamentally block the transmission of noise out of the tunnel (T) by removing air from the tunnel (T) by removing the media of the transfer of noise by passing the air or objects through the medium, leaving a space inside the vacuum.

Here, although the blocking wall 10 is composed of a hollow having a vacuum cavity 12 therein can effectively block the noise transmission, the noise due to the vibration of the blocking wall 10 can not be ignored. Therefore, in the cavity 12 of the blocking wall 10, a third porous sound absorbing material 13 such as, for example, glass fiber, is filled to absorb noise caused by the vibration of the blocking wall 10. At this time, the cavity 12 of the blocking wall 10 is exhausted in a state where the third porous sound absorbing material 13 is filled therein.

In addition, an exhaust hole 14 for discharging the vacuum exhaust of the cavity 12 and the purified noise passing through the blocking wall 10 is provided at the center of the outer surface of the blocking wall 10, and the exhaust hole 14 is provided. To the cavity 12 is shielded to maintain a vacuum while the porous noise stopper 15 is further coupled to further reduce the noise emitted from the blocking wall 10. The porous noise stopper 15 may be composed of various kinds, for example, a porous ceramic having numerous micropores.

In addition, more preferably, a fourth porous sound absorbing material 50 made of a sponge or nonwoven fabric is further provided on the rear surface of the blocking wall 10 to prevent noise caused by the vibration of the blocking wall 10 from the third porous sound absorbing material 13. ) Is simultaneously absorbed in and out of the barrier wall 10.

As illustrated in FIGS. 5 to 7, the sound pipe 20 includes a cylinder 21 having one end opened, a piston 22 accommodated in the cylinder 21 and sliding therein, and the piston 22 being a cylinder. And a compression spring 23 which elastically biases toward the opening of 21.

The cylinder 21 may be composed of a single body, but preferably, an inner tube 24 for receiving the piston 22 and the compression spring 23 and a second porous body excluding the opening of the inner tube 24. The sound absorbing material 25 and the second porous sound absorbing material 25 is formed of an outer surface 26.

The inner tube 24 has an end plate 27 for supporting the compression spring 23 at the rear end thereof, and a plurality of pores 24a and 27a for noise reduction on the main surface and the end plate 27. Have

The second porous sound absorbing material 25 may be composed of, for example, a sponge or a nonwoven fabric, and surrounds the circumference and the rear end of the inner tube 24. By the way, the rear end of the cylinder 21 should support the compression spring 23, the second porous sound absorbing material 25 is the circumference of the hard plate (25a) and the inner tube 24 surrounding the rear end of the inner tube (24) And separated into a soft pipe (25b) surrounding the circumference of the hard plate (25a).

As shown, the outer surface 26 is formed in a tubular shape that surrounds only the circumference of the second porous sound absorbing material 25, and a plurality of pores 26a are formed on the main surface thereof to reduce noise. Here, although not separately illustrated, the exterior 26 may also be configured such that the rear end is shielded like the inner tube 24 to completely surround the second porous sound absorbing material 25 except for the opening, in which case the end plate shields the rear end. Even pores are formed.

The inner tube 24 and the outer tube 26 are made of a synthetic resin pipe such as PVC pipe, for example, and the diameters of the pores 24a, 27a, and 26a formed therein are formed to be about 5 mm to 3 mm or less. It is desirable to be.

On the other hand, the pores (24a, 26a) provided on the main surface of the inner tube 24 and the outer surface 26 may be formed over the entire main surface thereof, as shown in the inner tube 24 is the piston 22 at the rear end thereof. It is preferable that the pores 24a are formed only to the position corresponding to the rear end, and the exterior 26 has the pores 26a formed only to the intermediate position at the rear end thereof.

This is because the piston 22 is fully retracted by the blast wind pressure to exhaust as much noise energy as possible kinetic energy, and at the same time, the sound source introduced into the sound pipe 20 is not exhausted to the surroundings and is sufficiently exhausted in the sound pipe 20. This is to be guided to the blocking wall (10).

That is, when the blasting wind pressure acts on the piston 22 and the piston 22 is pushed backward, the blasting wind pressure flowing into the inner tube 24 until the piston 22 retreats by a predetermined distance through the pores 24a. It is possible to exhaust as much energy as possible by the kinetic energy of the piston 22 by preventing it from escaping to the outside, and also moves from the inner tube 24 to the second porous sound absorbing material 25 through the pores 24a of the main surface thereof. The noise energy is not exhausted by the pores 26a of the exterior 26 and is exhausted by the thermal energy due to friction, and then proceeds to the rear end to be guided to the blocking wall 10.

The piston 22 is made of a lightweight plastic so that it can be easily pushed out by the blast wind pressure, the front surface (outer side: 22a) is made of a concave curved surface having a predetermined curvature to guide the blast wind pressure into the inner tube (24).

The elasticity of the compression spring 23 determines the consumption amount of the blast wind pressure exhausted by the kinetic energy, so the greater the elasticity, the better. However, when the elasticity is excessive, the elasticity of the compression spring 23 is not only difficult to fully exhibit its function but also adversely affects the stability of the device. It is appropriately set in consideration of the strength and the like.

The first porous sound absorbing material 30 is also filled in the space formed between the sound pipes 20, while surrounding the periphery of each sound pipe 20 arranged in a matrix, for example, between the blocking wall 10 It interposes and completely surrounds the sound pipe 20 except for the opening. The first porous sound absorbing material 30 is also made of a sponge or nonwoven fabric.

On the other hand, the blasting noise reduction device 1 of the present invention is composed of a plurality of unit modules 60 having a suitable size, preferably for construction and ease of maintenance by connecting and fixing each module 60 to each other It is composed.

That is, the blocking wall 10 is manufactured to an appropriate size, and the blocking wall 10 manufactured as described above, the sound pipe 20 having a predetermined amount (about 30 to 40 pieces), and the first and fourth porous sound absorbing materials ( 30) (50) are put into the cube frame 61 having each side opened, and then wire meshes 40 and 41 are respectively installed in the openings of the front and rear surfaces of the cube frame 61 to form the module 60. Several modules 60 configured as described above are connected and fixed to each other in a matrix.

In this case, not only manufacturing and transporting but also construction in the field is easy, and even if the wire mesh 40 or some sound pipes 20 are damaged by debris scattered during blasting, repair is possible only by replacing the damaged module 60. .

Here, although not separately illustrated, the blocking wall 10 and the fourth porous sound absorbing material 50 are left as they are, and only the sound pipe 20 and the first porous sound absorbing material 30 are configured as a module to the blocking wall 10. Of course, it can be installed.

In addition, since the blasting noise reduction device 1 shields the shaft portion of the tunnel T, the barrier wall 10 is provided with doors 81 and 82 for entrance of the vehicle and the pedestrian, respectively. The doors 81 and 82 are connected to each other by a hinge or the like when the barrier wall 10 is made of a single body. However, the doors 81 and 82 are simply configured by a combination of several modules 60. Can be.

Preferably, the blasting noise reduction device 1 of the present invention is mounted on the base 70 which is slidable to the ground without completely fixing the blocking wall 10, thereby blasting by retreating the whole device by the blasting wind pressure. A part of the wind pressure is configured to exhaust the mechanical kinetic energy together with the sound pipe 20.

The remaining reference numeral 71 denotes a support, 72 denotes a brace for preventing inclination of the blocking wall 10, and 90 denotes an H beam that is supported from the bottom so that the base 70 is slidable.

Next, the operation of the blasting noise reduction device 1 according to the present invention configured as described above will be described.

First, the blast wind pressure generated during the tunnel blasting proceeds toward the shaft along the tunnel T. In the shaft of the tunnel T, a plurality of surfaces are formed by the plurality of sound pipes 20 of the reduction device 1 of the present invention. It is divided into.

At this time, the blast wind pressure generated during the tunnel blasting is about 160 ~ 170㏈ in the shaft of the tunnel (T), for example, when the diameter of the piston 22 is 10cm about 8 ~ 15kg in the cross section of each piston 22 The instantaneous impact pressure of / cm 2 acts.

Accordingly, as shown in FIG. 7, the pistons 22 of the respective sound pipes 20 are pushed backwards while compressing the compression spring 23, so that a part of the blast wind pressure is primarily used as the kinetic energy of the respective pistons 22. Exhausted (compression spring is absorbed as it is compressed). At the same time, the entire reduction device 1 of the present invention is retracted while being slid backward by the blast wind pressure, thereby exhausting part of the blast wind pressure with the kinetic energy of the reduction device 1.

The blast wind pressure flowing into the inner tube 24 of the cylinder 21 while compressing the piston 22 of each sound pipe 20 is considerably weakened by exhaustion of the piston 22 and the abatement device 1 to the kinetic energy. Through the pores 24a of the inner surface of the inner tube 24 are introduced into the second porous sound absorbing material 25 surrounding it. Even at this time, the blast wind pressure is exhausted as thermal energy by resonance while passing through the pores 24a of the inner tube 24.

When the blast wind pressure weakens and escapes from the inner tube 24, the piston 22 is restored to the initial position by the restoring elasticity of the compression spring 23, thereby preparing for the explosion of the next step primer.

The blasting wind pressure introduced into the second porous sound absorbing material 25 is diffracted, reflected and radiated by its micropores, and loses a considerable amount of retained energy as thermal energy and reaches the blocking wall 10.

At this time, a part of the blast wind pressure is re-entered into the inner tube 24 behind the piston 22 through the pores 24a of the inner surface of the inner tube 24 to hit the compression spring 23 and hit the pores 27a of the end plate 27. Through the first porous sound absorbing material 30 to reach the blocking wall 10, a part directly reaches through the second porous sound absorbing material 25, and a part of the pores 26a of the exterior 26. After being discharged through), it reaches the blocking wall 10 via the first porous sound absorbing material 30.

Therefore, while repeatedly reaching the blocking wall 10 through physical phenomena such as diffraction, reflection, radiation, and resonance, the blocking wall 10 is reached with considerable energy consumed.

The blast wind pressure reaching the blocking wall 10 is very weak, but the blocking wall 10 is effectively blocked because the inside of the blocking wall 10 is in a vacuum state. However, only the noise due to the vibration of the blocking wall 10 by itself is discharged, and the noise caused by the vibration of the blocking wall 10 is also provided on the third porous sound absorbing material 13 filled in the vacuum cavity 12 and its rear surface. It is effectively absorbed and blocked by the fourth porous sound absorbing material 50 located.

Moreover, the reduced purified noise is discharged in a further reduced state through the porous noise stopper 15 provided in the exhaust hole 14 of the blocking wall 10, and thus the blast noise reduction device 1 of the present invention (1). The blast noise emitted through) is greatly reduced and hardly affects nearby residents or the environment.

According to the experiment of the present invention, the noise emitted through the porous noise stopper 15 of the barrier wall 10 is about 65 ㏈ or less, and does not affect the residential area to some extent away from the construction site.

As described above, according to the method and apparatus for reducing blast noise according to the present invention, the blast wind pressure energy generated during the blasting work is sequentially exhausted in a plurality of stages by using mechanical kinetic energy and physical thermal energy to drastically reduce the noise emitted. Since it can reduce the noise pollution due to blasting, it can greatly reduce the occurrence of noise-related complaints, and it is especially suitable for the noise reduction of tunnel construction where a lot of explosives are charged.

Moreover, the final blast wind pressure is converted to the air pressure level rather than pollution, so that night work is possible, and economic effects such as shortening of the construction period can be obtained, and tunnel construction in the vicinity of the city can be performed without difficulty.

In addition, it is possible to reliably block rock fragments scattered at the time of blasting, as well as to install and dismantle at the blasting site, as well as to damage by debris can be easily repaired.

Therefore, the present invention has a very excellent effect that greatly contributes to the improvement of reliability and construction efficiency, as well as to secure safety and blasting work.

Claims (18)

The blast wind pressure generated during the blasting work is first distributed to a plurality of piston means to exhaust part of the mechanical kinetic energy by the compression action of each piston, The excess noise energy exhausted by the kinetic energy is passed through the porous member having a myriad of fine pores and exhausted by the thermal energy by physical diffraction and resonance. A method for reducing blast noise, characterized by structurally blocking a path of blast wind pressure by a wall. The apparatus of claim 1, wherein the entire apparatus including the wall, the piston means, and the porous member is installed in a flow structure so that the entire apparatus is pushed backward by the blast wind pressure so that a part of the blast wind pressure together with the piston means is transferred to the mechanical kinetic energy. Blasting noise reduction method characterized in that the exhausted. The method for reducing blast noise according to claim 1 or 2, wherein a cavity is formed inside the wall, and the cavity is evacuated to a vacuum to block the transmission of noise. An apparatus for absorbing and reducing the blast wind pressure generated during blasting work, A blocking wall installed vertically on the traveling path of the blast wind pressure to block the progress of the blast wind pressure; A cylinder having one end open and a plurality of pores on a main surface thereof, a piston accommodated in the cylinder, and a compression spring for elastically biasing the piston toward the opening of the cylinder, the blocking being so that the opening of the cylinder faces the point of blasting. A plurality of sound pipes arranged and fixed to the inner side of the wall; A first porous sound absorbing material that surrounds each of the sound pipes except its opening; Blasting noise reduction device comprising a; wire mesh is positioned perpendicular to the opening of the sound pipes to block debris scattered during the blasting operation. 5. The cylinder of the sound pipe according to claim 4, wherein the cylinder of the sound pipe has a plurality of pores in the main surface and the rear end thereof, the inner pipe for accommodating the piston and the spring, a second porous sound absorbing material surrounding the inner pipe except for the opening, Blasting noise reduction device, characterized in that made of an appearance surrounding the second porous sound absorbing material having pores. The blast noise reduction device according to claim 5, wherein an outer surface of the piston is a concave curved surface having a predetermined curvature. The blast noise reduction device according to any one of claims 4 to 6, wherein the blocking wall is formed into a hollow having a cavity therein, and the cavity is evacuated to a vacuum. The blast noise reduction device according to claim 7, wherein the cavity of the barrier wall is filled with a third porous sound absorbing material. The blast noise reduction device according to claim 8, wherein an exhaust hole is provided on a rear surface of the blocking wall, and a porous noise stopper is coupled to the exhaust hole. The blast noise reduction device according to claim 4 or 9, wherein the front surface of the barrier wall is formed as a concave curved surface having a predetermined curvature. The blast noise reduction device according to claim 10, wherein a fourth porous sound absorbing material is further installed on the rear side of the blocking wall. 12. The method according to claim 11, wherein a predetermined number of said sound pipes, said first and fourth porous sound absorbing materials, and said barrier wall are housed and mounted in a support frame on a cube in which each face is opened, and at least a front surface of said support frame; Blasting noise reduction device, characterized in that the wire mesh is installed on the rear to form a plurality of unit modules, each module is connected in a matrix configuration. The plurality of unit modules according to claim 4, wherein a predetermined number of the sound pipes and the first porous sound absorbing material are accommodated and mounted in a support frame on a cube in which each surface is opened, and wire meshes are respectively provided on the front surface of the support frame. After constituting the blasting noise reduction device, characterized in that each module is configured to be fixed to the front of the blocking wall in a matrix form. The component according to any one of claims 4, 12, and 13, wherein each component including the blocking wall is installed on a base slidable with respect to the ground, and configured to retreat by the blast wind pressure. Blasting noise reduction device. The blast noise reduction device according to claim 4, wherein the barrier wall is provided with a vehicle and a pedestrian entrance door, respectively. 12. The blasting noise reduction device according to claim 11, wherein the first, second and fourth porous sound absorbing materials are made of any one of a sponge, a nonwoven fabric and a urethane foam. The blast noise reduction device according to claim 8, wherein the third porous sound absorbing material is glass fiber. The blast noise reduction device according to claim 9, wherein the porous noise stopper is made of a porous ceramic.

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