KR200279898Y1 - Bridge construct having noise reduction structure - Google Patents

Abstract

The present invention provides a bridge structure having a top plate 20 and a girder 24 and having a noise attenuation structure capable of absorbing the upper diffraction sound, the structure vibration sound, and the reflection sound when the bridge. The bridge includes a side sound insulation wall 46 provided on the upper surface of the bridge so as to be located on both sides of the upper plate 20, a frame 40 installed to cover the lower portion of the girder 24 and extend upward in the side direction. And a lower sound insulating wall 42 attached to the lower surface of 40.

Description

Bridge structure with noise damping structure {BRIDGE CONSTRUCT HAVING NOISE REDUCTION STRUCTURE}

The present invention relates to a bridge structure having a noise attenuation structure, and more particularly to a bridge structure having a noise attenuation structure to block various kinds of noise generated by the operation of the vehicle in the bridge.

In general, structures such as overpasses, bridges, and the like, which are installed in a city, generate noise due to the operation of a vehicle or a train, and become a main cause of deterioration of aesthetics. There are various kinds of noise generated in the bridge, and as shown in FIG. 7, noise (A) diffracted from the upper portion of the bridge 200, radiation sound (B) due to structure vibration, and reflection sound (C) when the bridge is have. At this time, among the noise of the bridge 200, the radiation sound B generated by the vibration of the vehicle occupies a considerable amount.

The present invention is to solve such a problem, the object of the present invention is to provide a bridge structure having a new type of noise attenuation structure that can effectively block the noise generated in the bridge and easily decorate the surrounding environment.

1 is a view for explaining an example of a bridge used in the experiment for obtaining a bridge structure having a noise damping structure according to a preferred embodiment of the present invention;

FIG. 2 is a graph showing various noise attenuation structures in the bridge of FIG. 1 and showing the distance attenuation of the noise level measured at 1.2 m above the ground; FIG.

FIG. 3 is a graph showing various noise attenuation structures in the bridge of FIG. 1 and measured noise spectra under the bridge; FIG.

4 is a view showing an example of a noise attenuation structure in the steel bridge for a bridge structure having a noise attenuation structure according to a preferred embodiment of the present invention;

Figure 5 is a graph showing the vibration acceleration spectrum of each member in the steel bridge of Figure 4;

6 is a view showing a bridge structure having a noise damping structure according to another embodiment of the present invention;

7 is a view for explaining the noise generated in a general bridge.

* Explanation of symbols for the main parts of the drawings

10, 200: bridge 20: top plate

24, 120: girder 28: bearing

40, 140: frame 42, 142: lower sound insulation wall

44, 144: anti-vibration rubber 46, 146: side sound insulation wall

48, 148: Sound absorbing material 120: Steel plate

According to a feature of the present invention for achieving the above object, the present invention has a top plate 20 and the girder 24 and has a noise attenuation structure that can absorb the upper diffraction sound, the structure vibration sound and the reflected sound when bridges Provide bridge structures. The bridge is provided with side sound insulating walls 46 provided on the upper surface of the bridge so as to be located on both sides of the upper plate 20, the frame 40 is installed to cover the lower portion of the girder 24 and extend in the upper direction of the side and the A lower sound insulating wall 42 is attached to the lower surface of the frame 40.

Such a bridge according to the present invention has all the above-described configuration as in the preferred embodiment, and the sound absorbing material 48 may be attached on the outer surface of the side sound insulating wall 46.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5 and 7. 1 to 5 and 7, the illustration and the detailed description of parts that can be easily predicted or understood by those skilled in the art as the prior art are omitted. In addition, the illustration of the parts commonly known to those skilled in the art in the use and installation of the basic parts are omitted and shown around the parts related to the present invention. In particular, there are parts in which the size ratio between the elements is somewhat different or the sizes between the components coupled to each other are different. However, the differences in representation of the drawings are easily understood by those skilled in the art. A separate description is omitted.

1 to 3 is a view showing the experimental results of the process of obtaining a bridge structure having a noise damping structure according to a preferred embodiment of the present invention, Figure 4 has a noise damping structure according to a preferred embodiment of the present invention FIG. 5 is a diagram illustrating an example of a noise attenuation structure in a steel bridge for a bridge structure. FIG. 5 is a graph showing a vibration acceleration spectrum of each member in the steel bridge of FIG. 4.

1 to 3, steel bridges having an upward line and a downward line as shown in FIG. 1 in order to obtain a noise attenuation structure that can attenuate upper diffraction sounds, structure vibration sounds, and reflected sounds when the bridge is generated in a bridge through which a vehicle passes; Was selected. The steel bridge is provided with a steel plate 120, a steel box (124) and the side flange 130. The steel bridge used in this experiment was constructed with a height of 3m from the ground consisting of 30m girders and 35m girders with a width of 2m and a distance of 2.2m between the upper and lower steel plates 120. At this time, the down line was in a state of wavy wear on the rail. 4 shows a steel plate 120, a box 124, a connection portion 128, a side flange 130, a frame 140, a lower sound insulation wall 142, a dustproof rubber 144, a side sound insulation wall 146, and a sound absorbing material 148. It shows a steel bridge composed of). The steel bridge is provided with a side sound insulation wall 146 on the side flange 130, the lower sound insulating wall 142 to cover the lower portion of the box 124 and cover the side, and the sound absorbing material (side) 148 was attached, and the anti-vibration rubber 144 was installed between the box 124 and the frame 140 (between the connection portion 128 and the frame 140). Here, the connection portion 128 is a configuration for connecting the box 124 and the frame 140, the frame 140 is configured to attach the lower sound insulating wall 142.

2 and 3 are graphs showing the results of measuring the distance attenuation of the noise level and the noise spectrum of the lower part of the bridge by configuring the noise attenuation structure in various forms in such a steel bridge, and FIG. 5 is a steel bridge as shown in FIG. It is a graph showing the vibration acceleration and spectrum of each member measured by constructing the.

The data measured in FIG. 2 and FIG. 3 are the up line (△) and the down line (▲) of the bridge having no sound damping structure (①), and the side sound insulating wall 146 is installed of the sound damping structure (②). Descending line (□), when the side sound insulation wall 146 and the anti-vibration rubber 144 are installed with the downward line (▽), the sound damping structure (③), the side sound insulation wall 146, the anti-vibration rubber 144, the lower part with the sound damping structure It is an up line ((circle)) and a down line ((circle)) when the sound insulation wall 142 and the sound absorption material 148 are provided (4). In this case, as shown in FIG. 4, the side sound insulation wall 146, the anti-vibration rubber 144, the lower sound insulation wall 142, and the sound absorbing material 148 are installed in the same manner as in the preferred embodiment of the present invention.

At this time, the side sound insulating wall 146 was constructed by attaching an asbestos straight plate having a surface density of 30 kg / m 2, and the lower sound insulating wall 142 sandwiched 0.4 mm of synthetic resin between steel plates having a thickness of 2.3 mm and having a surface density of 40 kg / m 2, The loss coefficient η = 0.4 of 1000 Hz, 20 ℃ was configured, the anti-vibration rubber 144 is made of mascot-based rubber, the sound absorbing material is composed of glass wool.

Referring to FIGS. 2, 3, and 5, in the case of ①, the downline with wave wear on the rail has a 9dB (A) larger noise measurement just below the bridge than the upline, and the difference between 500 and 2000 Hz in the noise and vibration acceleration spectrums. Looks. In the case of ②, since the noise reduction effect of 5dB (A) is directly below the bridge, it can be estimated that the ratio of the driving sound generated in the proximity of the wheel and the rail is greater than the reflection sound of the steel plate 120. In the case of ④, it can be seen that there is a noise reduction effect of 19dB (A) at the distance of 29dB (A) and 25m directly under the bridge compared to the construction of the noise attenuation structure, and the vibration acceleration of the lower sound insulation wall 142 is 0.3g. Compared with other cases in which the anti-vibration rubber 144 is not applied, the noise reduction effect is excellent. As a result of the experiment, the noise reduction effect of about 30dB (A) at the bottom of the bridge and about 20dB (A) at the 25m distance was confirmed by the side sound insulation wall 146 and the lower sound insulation wall 142. It shows that it is possible to reduce the noise of concrete structures and the like.

6 is a view showing a bridge structure 10 having a noise attenuation structure according to another preferred embodiment of the present invention.

Referring to FIG. 6, the bridge 10 according to the preferred embodiment of the present invention includes an upper plate 20, a girder 24, a bearing 28, a frame 40, a lower sound insulating wall 42, and a dustproof rubber 44. And a side sound insulating wall 46 and a sound absorbing material 48. In particular, the bridge 10 according to the present invention is characterized by installing a side sound insulating wall 46 on the upper surface of the bridge, and to install a lower sound insulating wall 42 to cover the lower side of the top plate 20 and cover the side. The frame 40 is connected to the top plate 20 or the girder 24 by various kinds of known means. With this structure, the upper diffraction sound, the structure vibration sound and the bridge reflecting sound are absorbed, and the sound absorbing material 48 is attached to the side sound insulating wall 46. The frame 40 is configured to attach the lower sound insulating wall 42.

As described above, the bridge structure having a noise damping structure according to a preferred embodiment of the present invention is shown in accordance with the above description and drawings, but this is merely described, for example, without departing from the spirit of the present invention. It will be appreciated by those skilled in the art that various changes and modifications are possible.

According to the present invention, the side sound insulation wall and the lower sound insulation wall are installed, and by using the sound absorbing material to configure the noise attenuation structure, it is possible to effectively absorb the upper diffraction sound, the structure vibration sound, and the reflection sound generated when the vehicle runs.

Claims (2)

In the bridge having the top plate 20 and the girder 24, Side sound insulating walls 46 installed on the upper surface of the bridge so as to be located at both sides of the upper plate 20; A frame (40) installed to cover the lower part of the girder (24) and extend in a lateral upward direction; Bridge structure having a noise damping structure, characterized in that the lower sound insulating wall 42 is attached to the lower surface of the frame 40 to absorb the upper diffraction sound, the structure vibration sound and the reflection surface when the bridge. The method of claim 1, Bridge structure having a noise damping structure, characterized in that the sound absorbing material 48 is attached on the outer surface of the side sound insulating wall (46).