Multi-layer three-dimensional reducing and guiding device for noise control of drilling and blasting engineering

Abstract

A multi-layer three-dimensional reducing and guiding device for drilling and blasting engineering noise control comprises a tunnel inner wall sound absorption layer, a reverse horn-shaped acoustic silencer and a lateral silencing barrier. The tunnel inner wall sound absorption layer is arranged on the tunnel inner wall close to the tunnel portal; the reverse trumpet-shaped acoustic silencer is arranged outside a tunnel portal and comprises a support, a trumpet-shaped main body is fixed on the support, and a sound absorption layer is sprayed or installed in the trumpet-shaped main body. The large-caliber end of the trumpet-shaped main body is opposite to a tunnel portal, and the small-caliber end of the trumpet-shaped main body is connected with the adjusting pipe; the lateral silencing barriers are arranged on the two sides between the reverse horn-shaped acoustic silencer and the tunnel portal. The multi-layer three-dimensional reducing and guiding device for drilling and blasting engineering noise control can effectively control propagation of noise inside and outside a tunnel.

Description

Technical Field

[0001] This utility model relates to the field of noise control, and in particular to a multi-level three-dimensional noise reduction and guidance device for drilling and blasting engineering. Background Technology

[0002] The noise in drilling and blasting operations mainly originates from the gas expansion during the explosion of explosives. Especially during tunnel construction, the reflection effect of the tunnel walls further amplifies the propagation and intensity of noise, causing it to be severely amplified after exiting the tunnel. This noise pollution has a significant impact on surrounding residential areas.

[0003] Currently, noise control in blasting primarily relies on improving blasting methods and selecting different types of explosives to reduce noise generation. For example, using low-noise explosives or modifying blasting methods (such as staged blasting or delayed blasting) can reduce noise to some extent. However, while these techniques are effective, they are usually accompanied by high costs, especially in large-scale projects where the use of special explosives and high-precision blasting parameter adjustments significantly increase construction costs. Therefore, controlling costs while reducing noise has become a major challenge in current noise control efforts. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a multi-level three-dimensional noise reduction and guidance device for drilling and blasting engineering. After blasting operations, it uses sound absorption, sound insulation and other technical means to reduce the noise intensity, and by adjusting the blasting method and timing, it flexibly guides the direction of sound wave propagation, so that the noise is directed away from residential areas and non-sensitive areas, thereby effectively reducing the impact of noise on the surrounding environment, and has a low implementation cost.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A multi-layered three-dimensional noise reduction and guidance device for drilling and blasting engineering includes a sound-absorbing layer on the inner wall of the tunnel, a reverse horn-shaped acoustic silencer, and a lateral noise-absorbing barrier.

[0007] The sound-absorbing layer of the tunnel inner wall is set on the inner wall of the tunnel near the tunnel entrance;

[0008] The reverse horn-shaped acoustic silencer is installed outside the tunnel entrance and includes a support frame on which a horn-shaped main body is fixed. A sound-absorbing layer is sprayed or installed inside the horn-shaped main body. The large-diameter end of the horn-shaped main body faces the tunnel entrance, and the small-diameter end of the horn-shaped main body is connected to an adjustment pipe.

[0009] The lateral noise-absorbing barriers are arranged on both sides between the reverse horn-shaped acoustic silencer and the tunnel entrance.

[0010] The horn-shaped main body is connected to the regulating pipe via a guide tube.

[0011] The guide tube is L-shaped.

[0012] The lateral noise reduction barrier includes a diagonal brace, with a baffle plate vertically fixed on one side of the diagonal brace. The upper end of the baffle plate is integrally formed with the arc-shaped part.

[0013] The baffle and the arc-shaped part are provided with a sound-absorbing coating or a sound-absorbing plate.

[0014] The regulating pipe is made of aluminum alloy corrugated pipe.

[0015] The sound-absorbing coating is made of micro-perforated aluminum sheet; the sound-absorbing board is made of rock wool.

[0016] This utility model provides a multi-level, three-dimensional noise reduction and guidance device for drilling and blasting engineering, which has the following technical effects:

[0017] 1) Through the synergistic effect of the sound-absorbing layer on the inner wall of the tunnel, the reverse horn-shaped acoustic silencer, and the lateral sound-absorbing barrier, reflected sound waves in the tunnel can be absorbed and noise energy can be dispersed, achieving multi-level reduction of noise and effectively reducing noise propagation during tunnel construction; at the same time, the sound waves can be guided away from residential areas and sensitive areas through the regulating pipe, reducing the impact on the surrounding environment.

[0018] 2) This device is placed at the tunnel entrance when the explosives are detonated; it can be easily removed after the blasting is completed, ensuring the unobstructed passage of the tunnel entrance.

[0019] 3) This device has a simple structure, which greatly reduces the implementation cost compared to existing methods. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 This is a schematic diagram of the installation structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the sound-absorbing layer on the inner wall of the tunnel in this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of the reverse horn-shaped acoustic muffler of this utility model.

[0024] Figure 4 This is a schematic diagram of the lateral noise reduction barrier in this utility model.

[0025] In the diagram: 1. Sound-absorbing layer on the inner wall of the tunnel; 2. Reverse horn-shaped acoustic silencer; 3. Lateral sound-absorbing barrier; 2.1. Support; 2.2. Horn-shaped main body; 2.3. Guide pipe; 2.4. Adjustment pipe; 3.1. Diagonal brace; 3.2. Baffle; 3.3. Arc-shaped part. Detailed Implementation

[0026] like Figures 1-4 As shown, a multi-layered three-dimensional noise reduction and guidance device for drilling and blasting engineering includes a tunnel inner wall sound-absorbing layer 1, a reverse horn-shaped acoustic silencer 2, and a lateral noise-absorbing barrier 3.

[0027] The tunnel inner wall sound-absorbing layer 1 is installed on the inner wall of the tunnel near the entrance. The tunnel inner wall sound-absorbing layer 1 can be made by spraying sound-absorbing materials or installing porous sound-absorbing panels to reduce the reflection and superposition of sound waves inside and weaken the tunnel "sound tube effect".

[0028] The reverse horn-shaped acoustic silencer 2 is arranged at the tunnel entrance. The silencer includes a support 2.1, on which a horn-shaped body 2.2 is fixed. A sound-absorbing layer is sprayed or installed inside the horn-shaped body 2.2. The large-diameter end of the horn-shaped body 2.2 faces the tunnel entrance, and the small-diameter end is connected to a guide pipe 2.3, which is connected to an adjusting pipe 2.4. The horn opening of the horn-shaped body 2.2 expands the angle and range of sound reception, guiding sound waves to concentrate and effectively reducing noise reflected and leaked from the sides or back. In contrast, the circular tube structure has a narrower sound reception angle, concentrating only in the direction of the tube opening; moreover, the circular tube is larger, requiring more space for installation. The horn-shaped device is more compact in size.

[0029] The lateral noise-absorbing barrier 3 is arranged on both sides between the reverse horn-shaped acoustic silencer 2 and the tunnel entrance. The lateral noise-absorbing barrier 3 includes a diagonal brace 3.1, with a baffle 3.2 vertically fixed to one side of the diagonal brace 3.1. An arc-shaped portion 3.3 is integrally formed at the upper end of the baffle 3.2, and the curvature direction of the arc-shaped portion 3.3 is consistent with the curvature direction of the tunnel. The advantages of setting the arc-shaped portion 3.3 are: 1. Optimized sound wave propagation: The barrier's curvature direction is consistent with the tunnel, which helps sound waves propagate more smoothly, reducing reflection and interference; 2. Improved noise reduction effect: Reduces sound wave diffraction and reflection, enhancing the barrier's noise absorption capacity; 3. Improved airflow and wind noise: Allows for smooth airflow, avoiding the generation of additional wind noise.

[0030] The regulating pipe 2.4 is made of aluminum alloy corrugated pipe, which can be adjusted in direction. The inner surface of the pipe is coated with a damping coating (rubber or asphalt) to reduce pipe wall vibration and reduce the propagation of low frequency noise.

[0031] The sound-absorbing layer 1 and the horn-shaped main body 2.2 on the inner wall of the tunnel are constructed using a sound-absorbing coating or sound-absorbing panels. The sound-absorbing coating is made of micro-perforated aluminum sheet with tiny perforations on the surface, which absorbs noise through resonance. The sound-absorbing panels are made of rock wool, whose fiber structure effectively reduces mid-to-high frequency noise.

[0032] Working principle and process:

[0033] 1) Based on the dimensions of the tunnel cross-section in the drilling and blasting project, sound-absorbing materials are sprayed or sound-absorbing panels are installed on the inner wall of the tunnel entrance. The sound-absorbing materials or panels can adopt a porous structure to absorb sound wave energy, reduce noise reflection and propagation, and initially reduce the noise intensity transmitted from the tunnel entrance, providing a basis for subsequent noise control measures.

[0034] 2) Based on the dimensions of the tunnel cross-section in the drilling and blasting project, a reverse-flange acoustic silencer 2 is designed. The bottom of the reverse-flange acoustic silencer 2 is equipped with a support for easy installation and to ensure stability. The end of the reverse-flange acoustic silencer 2 is connected to an adjustable pipe 2.4. By adjusting the guide angle, sound waves are guided to non-sensitive areas, avoiding direct noise impact on the surrounding environment. To further enhance noise attenuation, sound-absorbing materials are sprayed or installed on the inner wall of the silencer; or sound-absorbing materials and panels are used to effectively absorb and attenuate the propagation of sound waves.

[0035] The regulating pipe 2.4 is made of aluminum alloy corrugated pipe, which can be adjusted in direction. The inner surface of the pipe is coated with a damping coating (rubber or asphalt) to reduce pipe wall vibration and reduce the propagation of low-frequency noise. 2. It mainly controls the direction of noise propagation rather than conduction. The design length is relatively short and the radius is not large, so it can be directly adjusted manually to make the actual direction of noise propagation at the project site avoid residential areas or other sensitive areas, without the need for additional complex installation components for special direction adjustment.

[0036] 3) Symmetrical lateral noise-absorbing barriers 3 are installed on both sides of the tunnel entrance to prevent noise leakage from the sides, further enhancing the overall noise control effect of the reverse horn-shaped acoustic silencer 2. These lateral noise-absorbing barriers 3 can also be made of sound-absorbing materials, effectively absorbing sound waves and reducing their diffusion along both sides of the tunnel. By blocking the lateral propagation of noise, the barriers concentrate noise energy within the effective range of the horn-shaped silencer, enhancing the silencer's concentrated noise suppression effect and optimizing the spatial distribution of noise, ensuring that noise is sufficiently attenuated within the effective area to a greater extent.

[0037] This noise reduction device is deployed only at the tunnel entrance during explosive detonation to reduce noise generated during the blasting process. After the blast, the device can be easily removed (a base and wheels can be added if necessary), without affecting the accessibility of the tunnel entrance. After removal, the entrance remains open, ensuring smooth entry and exit for personnel and machinery, and guaranteeing normal construction progress. This design allows the noise reduction device to function only during peak noise periods, without interfering with daily construction, providing a flexible noise control solution.

[0038] This device is designed for noise control in drilling and blasting operations, with a focus on the amplification effect of tunnel walls on noise propagation. Employing a three-dimensional noise reduction technology and an innovative scheme to guide noise propagation paths, it effectively controls noise propagation both inside and outside the tunnel, reducing the impact of noise on surrounding residential areas and the environment.

Claims

1. A multi-layered three-dimensional noise reduction and guidance device for drilling and blasting engineering, characterized in that: It includes a sound-absorbing layer on the inner wall of the tunnel (1), a reverse horn-shaped acoustic silencer (2), and a lateral sound-absorbing barrier (3). The sound-absorbing layer (1) of the tunnel inner wall is set on the inner wall of the tunnel near the tunnel entrance; The reverse horn-shaped acoustic silencer (2) is installed outside the tunnel entrance and includes a bracket (2.1). A horn-shaped body (2.2) is fixed on the bracket (2.1). A sound-absorbing layer is sprayed or installed inside the horn-shaped body (2.2). The large-diameter end of the horn-shaped body (2.2) is directly opposite the tunnel entrance, and the small-diameter end of the horn-shaped body (2.2) is connected to the regulating pipe (2.4). The lateral noise-absorbing barrier (3) is arranged on both sides between the reverse horn-shaped acoustic silencer (2) and the tunnel entrance.

2. The multi-layered three-dimensional noise reduction and guidance device for drilling and blasting engineering noise control according to claim 1, characterized in that: The horn-shaped main body (2.2) is connected to the regulating tube (2.4) through the guide tube (2.3).

3. The multi-layered three-dimensional noise reduction and guidance device for drilling and blasting engineering noise control according to claim 2, characterized in that: The guide tube (2.3) is L-shaped.

4. The multi-layered three-dimensional noise reduction and guidance device for drilling and blasting engineering noise control according to claim 1, characterized in that: The lateral noise reduction barrier (3) includes a diagonal brace (3.1), and a baffle (3.2) is vertically fixed on one side of the diagonal brace (3.1). The upper end of the baffle (3.2) is integrally formed with the arc-shaped part (3.3).

5. A multi-layered three-dimensional noise reduction and guiding device for drilling and blasting engineering noise control according to claim 4, characterized in that: The baffle (3.2) and the arc-shaped part (3.3) are provided with a sound-absorbing coating or a sound-absorbing plate.

6. A multi-layered three-dimensional noise reduction and guiding device for drilling and blasting engineering noise control according to claim 5, characterized in that: The regulating pipe (2.4) is made of aluminum alloy corrugated pipe.

7. A multi-layered three-dimensional noise reduction and guidance device for drilling and blasting engineering noise control according to claim 6, characterized in that: The sound-absorbing coating is made of micro-perforated aluminum sheet; the sound-absorbing board is made of rock wool.

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