KR200358320Y1 - Damping sound-proof wall for bridge - Google Patents

Abstract

The present invention absorbs and blocks the noise generated in places with high noise levels such as roadsides, railroads, subways, factories, airports, etc. It is about the vibration damping board for the bridge that suppresses itself and reduces vibration and noise.

The present invention is a soundproof panel consisting of a front plate having a plurality of sound absorbing holes, a back plate coupled to the rear of the front plate at a predetermined interval, and a sound absorbing material embedded between the front plate and the back plate, the front of the back plate It relates to a vibration damping plate for bridges, characterized in that the vibration damping of the soundproof panel by attaching a rubber damping material to the air layer between the sound absorbing material and the sound absorbing material.

Description

Damping sound-proof wall for bridge

The present invention absorbs and blocks the noise generated in places with high noise levels such as roadsides, railroads, subways, factories, airports, etc. Sound suppression plate structure that suppresses itself to reduce vibration and noise.

Due to the development of industry and the development of transportation, the noise problem is seriously raised on the highway side due to the high-speed operation of the vehicle or the railway by the train operation or near the bridge through which the train or the train passes. In particular, residents near roadsides and railways are complaining about the problems caused by noise and vibrations caused by high-speed driving. Accordingly, conventionally, various types of soundproof walls are installed on a roadside or a railroad side to absorb or block traffic noise. Most of these soundproof walls are provided with a plurality of H beams at a predetermined interval on a foundation concrete buried along a roadside. A plurality of sound insulation panels are stacked between two adjacent H beams.

That is, as shown in Fig. 1 (a) (b), the conventional soundproof plate, the front plate 2 is formed with a plurality of sound absorbing holes (6), the back is constantly coupled to the rear of the front plate (2) It consists of a plate (3), a sound absorbing material (4) provided in the inner space formed by the front plate (2) and the back plate (3) and an air layer (5) formed between the sound absorbing material (4) and the back plate (3) have. In this case, in order to increase the sound absorbing efficiency of the noise, the gallery-type sound absorbing hole 6 having a high aperture ratio is formed in the front plate 2 so that the sound absorbing material 4 absorbs the noise generated from the road or railway side, and the air layer 5 ) And the back plate 3 are blocked to show excellent soundproofing effect.

However, in the case of the conventional sound insulation board, the sound absorption rate at the front plate 2 could be increased, but there was a problem in the vibration problem of the back plate 3 by the external vibration source in the area where the noise was very large and the sound insulation performance accordingly. . Vibration refers to a shaking phenomenon in which an object repeatedly moves with respect to a reference position due to the excitation force, and this vibration not only destroys a pleasant living environment due to unwanted cold movement but also adversely affects the life of the structure of the machine itself.

In particular, when a train passes through an iron bridge, it generates a very large vibration, and by this vibration, secondary noise is radiated by the vibration of an iron bridge or the soundproof wall itself, which may generate a louder noise level of 20db (A) or more than that of a general ground. . Db (A) is a unit of noise-corrected noise that can measure a degree similar to the human senses by correcting the difference between the average mechanical measurement result and the human sense of hearing. In the case of such a loud noise, when installing and controlling a general conventional soundproof wall, secondary noise is radiated due to the vibration of the soundproof plate, especially the back plate 3 due to vibration, so there is a problem that it is difficult to expect a great noise reduction effect. Existing soundproof walls are vibrated due to fatigue phenomenon or cracks in the existing soundproofing panels or the components of the soundproof walls installed by continuous fastening due to the overload of the track during high speed driving, and the repeated vibration causes the inner and outer walls of the structure itself to peel off. In addition, the fastening force of the soundproof plate 1 itself is weakened by loosening the fastening site. This problem is a part that can be highlighted with the operation of high-speed railway.

The present invention has been devised to overcome the above-mentioned problems, and the main object of the present invention is to appropriately arrange the rubber vibration damper so that the air layer between the back plate of the soundproof plate and the sound absorbing material is an integer multiple of λ / 4 of the frequency at which the target noise is produced. In order to maximize the vibration damping efficiency, to improve the soundproofing performance, and to improve the sound absorption rate of low-frequency sound, to provide an installation structure of the vibration damping plate for the bridge that can have a rear air layer.

1 is a view illustrating the structure of a conventional sound insulation board, FIG. 1A is a perspective view, and FIG. 1B is a sectional view of FIG.

Figure 2 is a cross-sectional view showing an embodiment of the soundproof plate is attached rubber damping material according to the present invention

Figure 3a is a perspective view showing a soundproof plate formed with a bent portion on the back plate, Figure 3b is a cross-sectional view of Figure 1a

Figure 4 is a cross-sectional view showing another embodiment of the sound insulation panel according to the present invention

Figure 5a, Figure 5b is a cross-sectional view showing another embodiment of the sound insulation panel according to the present invention

＊＊＊ Explanation of symbols for main parts of drawings *＊＊

1: soundproof plate 2: front panel

3: back plate 4: sound absorbing material

5: air layer 6: sound absorbing hole

7: rubber damping material 8: bending part

9: attachment groove

In order to achieve the above object, the present invention devises a front plate 2 having a plurality of sound absorbing holes 6, a back plate 3 coupled to the rear of the front plate 2 at a predetermined interval, and a front plate ( In the soundproof plate 1 composed of a sound absorbing material 4 embedded between 2) and the back plate 3, the rubber vibration damping material 7 is attached between the front portion of the back plate 3 and the sound absorbing material 4. A vibration damping soundproofing plate (1) for a bridge is provided.

Hereinafter, with reference to the accompanying drawings will be described in detail the preferred embodiment, configuration and operation in connection with the vibration damping soundproof plate (1) according to the present invention.

First, the configuration and operation of the sound absorbing plate 1 that absorbs the noise is briefly mentioned. The sound source of the sound is partially absorbed and blocked through the sound absorbing hole 6 attached to the front part of the front plate 2 of the soundproofing plate 1. After the soundproof plate (1) and the sound absorbing material (4) formed in the front portion is canceled noise or vibration noise, the sound absorbing material (4) uses a foam-based foam or glass fiber, etc., the sound absorbing material (4) and the back It is blocked by the back plate 3 back plate through the air layer 5 between the plates 3 and is reflected back to the sound absorbing material 4 again to remove residual sound waves. In the soundproof plate 1 fastening, the fastening structure of the soundproof plate 1 coupled to the front plate 2, the back plate 3, and the side plate must be strong enough to withstand the impact of noise or external vibration. However, the fastening force may be a problem due to the external environment with a high noise or vibration, a problem that may be a double problem is the back plate (3) part that can be most easily exposed to external shock and bring about a fastening force.

In the present invention, as shown in FIG. 2, when the soundproof plate 1 is fastened, the back plate 3 and the front plate 2 are attached again using the rubber damping material 7 to increase external shock absorption rate and suppress vibration and noise. Soundproof plate (1) for showing the fastening structure is shown. Damping material is a material that absorbs vibration energy as heat energy and prevents vibration transmission, and refers to a member that reduces vibration source and vibration itself of a solid. In the present invention, rubber is used as a vibration damping material that suppresses such vibration. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 2 as an embodiment according to the present invention, the sound absorbing material 4 and the sound absorbing material 4 embedded in the front surface of the sound absorbing plate 1 and the front plate 2 and the sound absorbing plate 1 are embedded. Rubber to block the internal vibration and noise by suppressing the vibration in the existing soundproof plate (1) consisting of the back plate (3) of the rear portion of the soundproof plate (1) which is fastened to the front plate (2) while forming the air layer (5) It can be seen that the vibration damping material 7 is attached between the sound absorbing material 4 and the back plate 3.

In this case, when the rubber damping material 7 is attached, the air layer 5 between the back plate 3 and the sound absorbing material 4 is disposed so as to be an integer multiple of λ / 4 of the frequency to be the target noise, resulting in noise due to offset of the target noise. The rubber vibration damping material 7 is attached to the inner surface of the back plate 3 by an adhesive or the like, and is equal to the distance of the air layer 5 between the sound absorbing material 4 and the back plate 3. It is to be attached between the sound absorbing material 4 and the back plate 3 by an interval corresponding to an integral multiple of / 4. The integer multiple of lambda / 4 is a calculated value of the optimum value for causing incident noise to enter the interference path and cause interference or reduction of elemental sound due to phase difference. The attenuation frequency is based on the length of the inflation portion, and the length thereof is ideally λ / 4, so that the air layer 5 between the back plate 3 of the sound insulation plate 1 and the sound absorbing material 4 is λ / 4 of the frequency at which the target noise becomes the object noise. The rubber vibration damping material 7 is appropriately disposed so as to have a constant multiple to maximize the vibration damping efficiency. Where λ is the wavelength and the distance the wave propagates between one cycle, and it is the magnitude of energy, and the frequency is the number of periodic movements performed in one second. As a result, the frequency and the wavelength are inversely proportional, and noise reduction of the low frequency becomes more difficult than the high frequency because the wavelength representing the magnitude of the unit energy increases as the low frequency file becomes larger. When the rubber damping material 7 is used as in the present invention, the rear air layer 5 may be formed to increase the sound absorption rate of low frequency noise.

On the other hand, unlike metals, rubber itself is widely used as a damping, dustproof, seismic, shock absorber, and cushioning material in various industrial fields because the rubber itself has a property of dissipating external energy due to the viscoelastic properties due to internal friction. In the present invention, rubber is used as a vibration damper by utilizing the vibration damping characteristics of the rubber.

In another embodiment, the front plate 2 having a plurality of sound absorbing holes 6 is coupled to the rear of the front plate 2 at regular intervals, and the bent portion 10 is formed at the central portion of the rear plate 3. In the soundproof plate (1) composed of a back plate (3) and a sound absorbing material (4) embedded between the front plate (2) and the back plate (3), the soundproof plate (1) structure in which the rubber damping material (7) is coupled Let's look at it.

First, as shown in FIGS. 3A and 3B, the bent portion 8 is formed at the center portion of the back plate 3. The reason for forming the bent portion 8 is the sound absorbing material 4 and the back plate ( 3) The air layer 5 is formed between them, and the interface between the concave and convex portions of the bent portion 8 is formed to disperse the moving path of the sound source to reduce the noise source. To do so. The back plate 3 is made of a metal such as zinc and the sound absorbing material 4 is made of glass fiber, etc. In the embodiment of Figure 4, the air layer 5 between the back plate 3 and the sound absorbing material (4) The bent portion 8 is formed at the center of the back plate 3 in the direction of), and the valley depth of the bent portion 8 is slightly shorter than the distance formed by the air layer 5, and thus the distance formed by the air layer 5 and the bent portion 8. The rubber vibration damping material 7 as much as a predetermined gap as much as the difference in bone depths is attached. In this case, the rubber vibration damping material 7 is attached to the back plate 3 by the size of the end face of the bent portion 8, and then closely adhered to and supported by the sound absorbing material 4, in this case It is also possible to wrap a predetermined portion toward the inclined surface from the front side of the bent portion.

As mentioned above, in the present invention, an integer of λ / 4 of a frequency at which the air layer 5 between the back plate 3 and the sound absorbing material 4, through which the noise source passing through the sound absorbing material 4 moves through the medium, becomes an object noise. In this embodiment, the sum of the bone depths of the air layer 5, that is, the back plate 3, the bent portion 8, and the length of the rubber vibration damping material 7 adhered to each other are the target noises. This is because it must be installed so that it is an integer multiple of lambda / 4 of the frequency. In this case, since the rubber for damping is consumed relatively little, it is advantageous in terms of price competition.

In another embodiment, the grooves of the back plate 3 are formed such that the bone depth of the bent portion 8 is about a portion of the distance of the air layer 5 and the attachment groove 9 formed around the bent portion 8 is formed. Therefore, a state in which the rubber vibration damping material 7 is installed and a flat surface of the rubber vibration damping material 7 is attached to the sound absorbing material 4 can be seen in FIGS. 5A and 5B. In this case, the bone depth of the bent portion 8 formed at the center of the back plate 3 can be varied by 3/4, 1/4, etc. of the distance of the air layer 5, and around the valley of the bent portion 8. The size of the vibration damping rubber installed and the rubber damping material 7 attached to the sound absorbing material 4 can also be variably adjusted corresponding to the bone depth of the bent portion 8. As a result, the necessity of vibration damping or the strength of vibration damping is determined according to the magnitude of vibration or noise, and the size of the rubber damping material can be properly adjusted according to the size of the noise or vibration source. Of course, even in this case, the air layer 5 formed by the distance between the sound absorbing material 4 and the flat surface of the back plate 3 should be an integer multiple of λ / 4 which is the object noise. In this case, the rubber vibration damping material 7 is attached to the attachment groove 9 around the bent portion 8 of the back plate 3 so as to adhere and support the sound absorbing material 4 so that the rubber vibration damping material 7 The vibration of the back plate 3 is primarily absorbed and the vibration is absorbed by the sound absorbing material 4 to suppress the vibration of the back plate 3 to achieve the desired purpose.

As described above, the present invention has the effect of improving the vibration damping efficiency and soundproofing performance by arranging the vibration damping material at regular intervals to maximize the damping efficiency between the sound absorbing material and the front portion of the back plate.

The present invention can adequately absorb the secondary noise caused by the vibration of the soundproof wall due to the loud noise generated when the train passes through the railway bridge, which can bring about a large noise reduction effect and a vibration suppression effect.

The present invention can have a rear air layer by attaching a rubber vibration damper between the front portion and the sound absorbing material of the back plate can improve the sound absorption rate of the low frequency sound as well as improving the vibration damping efficiency and sound insulation.

Claims (5)

In the soundproof panel consisting of a front plate having a plurality of sound absorbing holes, a back plate coupled to the rear of the front plate at a predetermined interval, and a sound absorbing material embedded between the front plate and the back plate, A vibration damping board for bridges, characterized in that the vibration damping panel is suppressed by attaching a rubber damping material to the air layer between the front part of the back plate and the sound absorbing material. The method of claim 1, When the rubber damping material is attached, the vibration damping plate for bridges, characterized in that the air layer between the back plate and the sound absorbing material is arranged to be an integer multiple of λ / 4 of the frequency of the object noise. In the soundproof panel consisting of a front plate having a plurality of sound absorbing holes, a rear plate coupled to the rear of the front plate at a predetermined interval and having a bent portion in the center portion, and a sound absorbing material embedded between the front plate and the back plate, A vibration damping soundproof board for bridges, comprising: a rubber vibration damping material fixed to the front portion of the bent portion formed on the rear plate to closely adhere to and support the sound absorbing material; The method of claim 3, A vibration damping soundproof plate for bridges, comprising: a rubber vibration damping material that is in close contact with the sound absorbing material while wrapping the bent portion formed on the rear plate, and forming an attachment groove for fixing the rubber vibration damping material around the bending part. The method according to claim 3 or 4, When the rubber damping material is attached, the air depth between the sound absorbing material and the backing plate formed by the rubber damping material which is attached to the bone depth of the bent portion of the rear plate and the rubber vibration damping material adhered to the sound absorbing material in close contact with the sound absorbing material is λ / 4 Damping sound insulation board for bridges, characterized in that arranged to be an integer multiple