JPH02266002A - Elevated structure for transportation equipped with sound wave control device - Google Patents

Abstract

PURPOSE:To improve noise-decreasing effect and efficiency of work execution by installing sound wave-refracting devices having a plurality of through passages, each different in length, to openings of floor slabs and to upper end of soundproof wells of an elevated structure for railway tracks or the like. CONSTITUTION:Sound control devices 17 and 18 having a plurality of through passages 19, each of which is different in length in consecutive order, are constructed of high- density materials such as metals, inorganic materials, plastics or the like. The devices 17 are installed along openings 16 of a floor slab 14 of an elevated structure and, at the same time, the devices 18 are installed at the upper end of soundproof walls 15 and in the direction along the walls. As noises emitted from contact of rails 13 and wheels run through each of the through passages 19, lines of sound waves are refracted in the direction toward the side of bridge piers 15 and dispersion of the sound wave to the outside is curbed thereby. The sound wave control device may be constructed in a lens-like-shaped hollow structure so that the sound wave may be focused on a prescribed sphere of convergence. Thereby noise-decreasing effect can be improved, while work efficiency for installation can be improved as the device can be made compact and lightweight and available for mass procution.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transportation system equipped with a sonic wave control device for reducing the noise generated by a transportation vehicle running on an elevated structure Q that constitutes a railway or a roadway. Regarding elevated structures.

[Prior Art] In recent years, the speed of transportation vehicles such as Shinkansen trains that run on elevated structures has tended to increase, and as speeds increase, vibration reduction and noise prevention become more important issues.

As devices for preventing noise generated on elevated transportation structures, direct sound walls or inverted sound walls are generally used above the track or road surface, and both are equipped with sound-absorbing materials. In addition, noise spreads downward from the openings formed in the elevated floor slabs of elevated structures, and until now there have been few examples of installing soundproofing measures for these openings, but conventional technology Possible options include blocking it with a board or installing a sound-absorbing duct I.

FIG. 14 is a schematic cross-sectional view illustrating an elevated transportation structure equipped with the conventional noise reduction device described above, in which 1Δ and IB are the left and right bridge girders, and 2A and 2+1 are the opposite Type soundproof wall, 3Δ, 3B is a panel of sound absorbing material bonded to the inner surface of soundproof wall 2A, 2B, 4 is elevated floor slab, 5A5B
The openings formed in the elevated floor slab 4 represent cold and sound-absorbing ducts, respectively.

[Technical problem to be solved by the invention]

However, conventional elevated transportation structures have the following technical problems.

Import) First, install the above-mentioned soundproof walls on both sides of the track or roadway.
In the method of installing 2B, even if the wall is made higher or in an inverted I7 shape, the sound waves are diffracted from the top of the soundproof wall, so there is a limit to the noise reduction effect.

Furthermore, if the soundproof walls 2A and 2B were made too high, the weight would increase rapidly, and secondary problems such as worsening of sunlight may occur.

Furthermore, when the sound absorbing materials 3A and 3B are bonded together, there may be problems with their durability, and there is also the problem of poor mass productivity and high cost.

(+1) In the method of providing the sound absorbing ducts 1-5A and 5B, the duct structure becomes large and the weight increases significantly, which may cause design problems.

In addition, the structure of installing the 5ft+5B duct is complicated, and there are also problems with the durability of the sound-absorbing material, which makes it difficult to mass-produce and increases costs.

The present invention has been developed in view of these conventional technical problems, and has a sound reduction effect, is compact and lightweight, and has excellent mass productivity and ease of construction. An object of the present invention is to provide an elevated structure for transportation in which a control device is arranged.

[Means for solving problems]

The present invention achieves the second object by using a sound wave control device that refracts or interferes with sound waves from a noise source such as rolling noise generated between a rail and a wheel.

In the invention of claim 1, a sound wave control device consisting of a plurality of through passages with varying passage lengths is arranged in the opening of the elevated floor slab or the top end of the soundproof wall along the transport direction, and the sound waves are transmitted through the through passages. A sound wave control device characterized in that the traveling direction of the sound wave is refracted toward the center of the elevated structure by passing through the space, thereby reducing the spread of the sound wave from the opening and the top end of the soundproof wall to the outside of the elevated structure. The present invention provides an elevated structure for transportation in which

In the invention of claim 2, a sonic wave control device consisting of a plurality of through passages with varying passage lengths is partially disposed at the opening of the elevated floor slab or at the top end of the soundproof wall, and the sound wave control device is partially disposed at the opening of the elevated floor slab or at the top end of the soundproof wall. By causing sound waves and sound waves that do not pass through the passage to interfere with each other,
For transportation equipped with a sound wave control device characterized in that a sound attenuation area is created below the opening or above the top end of the soundproof wall to reduce the diffusion of sound waves outside the elevated structure-1. It provides an elevated structure.

According to the third aspect of the invention, the sonic wave control device having a plurality of through passages is also used as a grating for pedestrians moving on an elevated structure, thereby expanding the functionality of the sonic wave control device.

〔Example〕

The present invention will be specifically described below with reference to FIGS. 1 to 13.

FIG. 1 is a schematic cross-sectional view of an elevated transportation structure equipped with a sonic wave control device according to the present invention.

In Figure 1, an elevated structure 1 for transportation such as a high-speed railway
0 is the left and right (up, down) bridge girder IL], 1 is supported by piers 12 arranged at predetermined intervals at each corner, and the bridge girder IL 1
It is constructed by laying rails 13.13 on the top surface of bridge girder 11.1 on the left and right. , 1.1 and on the outside thereof, an elevated floor slab 14 forming a flat surface is installed, and on both sides of this elevated floor slab 14 there are upright or inverted 15-shaped soundproof walls 15.1. .5 is provided.

The bridge girder 11 of the elevated deck slab 14. , 1.1 and outside thereof, an opening 16 is formed along the transport direction, and a sonic wave control device 17 is arranged along the opening 16.

Further, in the illustrated example, the sound wave control device 18 is also arranged at the top end portions of the left and right soundproof walls 15.1.5 along the transport direction.

FIG. 2 is a perspective view schematically showing the structure of the sonic control device 1.7.18, which includes a plurality of through passages I9 whose passage lengths are sequentially changed. It consists of a hollow body.

The sonic wave control devices 17, 18 are arranged such that hollow bodies having a predetermined rlW and a length 2 are arranged side by side in the direction of the length I.

The third is a cross-sectional view schematically showing the state through which the sound waves of the sound wave control devices 17 and 18 pass.

In FIG. 3, the passage length of the plurality of through passages 19 formed in order in the width direction is determined by the arrival time of the sound wave at the exit of each through passage I9, as the sound wave from the sound source A passes through each through passage 19. The structure is configured such that a difference occurs in the sound waves, and the traveling direction of the sound waves changes (refracts) in a predetermined direction.

Therefore, each sound wave control device 17.1.8 in the elevated structure 10 in FIG.
The traveling direction of the sound wave is refracted toward the center of the elevated structure (usually the piers 12 on the same side), and the opening 1 of the elevated deck 14
6 and the soundproof walls 1.5.1.5 are arranged so as to reduce (suppress) the spread of sound waves from the top ends of the elevated structure 10 to the outside of the elevated structure 10.

FIG. 4 is a schematic cross-sectional view of an elevated transportation structure 20 equipped with a sonic wave control device according to another embodiment of the present invention.

The elevated structure 20 in FIG.
Sonic control device 27 and soundproof wall 15.1.5 located in
As the sound wave control device 28 placed at the top end of the device, a lens-shaped sound wave refraction type hollow body as shown in FIGS. 5 and 6 is used instead of the control device 17.18 in FIG. The structure is substantially the same as that of the elevated structure 10 shown in FIG.

Therefore, in FIG. 4, parts corresponding to those in FIG. 1 are indicated by the same numbers, and detailed explanation thereof will be omitted.

FIG. 5 is a schematic perspective view of the sound wave control device 27.28 in FIG. 1, and the sound wave control device 27.28 is constituted by a hollow body with a lens-shaped cross section with a protruding lower surface.

In the case of this sonic control device 27, 28, as shown in the figure,
By inclining the longitudinal partition wall 21 in a predetermined direction, a plurality of through passages 29 whose passage lengths sequentially change are formed.

These sonic control devices 27, 28 also have a predetermined l'jl
A unit I having W and a length I7 is attached to the elevated structure 20
are placed side by side in the length direction.

FIG. 6 is a cross-sectional view schematically showing the passage of sound waves through the sound wave control devices 27 and 28.

In FIG. 6, the passage lengths of the plurality of through passages 29 arranged in sequence in the 141 direction and inclined in a predetermined direction are as follows:
It is determined that the arrival timing of the sound waves at the exit of each through-path 29 is sequentially different, the traveling direction of the sound waves changes (refracts) in a predetermined direction, and the sound waves that have passed are determined to converge in a focusing area B set at a predetermined position. ing.

Therefore, in the elevated structure 20 shown in FIG. , the traveling direction of sound waves passing through each through passage 29 from a sound source such as transfer noise generated between the rail 13 and the wheels is refracted in a predetermined direction, and the sound waves traveling downward from the openings 16 are directed toward the elevated structure 20 (normally By concentrating the sound waves toward the center of the pier 12) on the same side and also concentrating the sound waves traveling upward from the top of the soundproof wall 15 at a predetermined point above, the diffusion of sound waves outside the elevated structure 20 is reduced. (suppress)

FIG. 7 shows the sound wave control device 27 explained in FIGS. 4 to 6.
28 is a schematic cross-sectional view illustrating the state of sound wave control when applied to a Shinkansen elevated bridge, in which a Shinkansen vehicle (high-speed vehicle) 22 is
When the vehicle runs, the noise (arrow 24) generated from between the rail 13 and the wheels 23 is transmitted to a predetermined area below and above the elevated structure 20 by passing through each sonic wave control device 27, 28, as shown in the figure. The light will be concentrated in the focusing area B of the area.

Therefore, the noise generated when the vehicle is running is transmitted to the elevated structure 2.
The degree of diffusion outside of zero is effectively reduced.

FIG. 8 is a schematic cross-sectional view of an elevated structure 30 in which a sonic wave control device according to yet another embodiment of the present invention is arranged.

The elevated transportation structure 30 in FIG. The area is either left open or has a structure with a simple grid-like grating.

(8) and (B) of FIG. 9 are cross-sectional views schematically showing structural examples of the sonic control devices 37 and 38 in FIG. 8, respectively, and these sonic control devices 37 and 38 are A hollow body consisting of a plurality of through passages 39 with varying passage lengths, ie, a hollow body shown in FIG. 2, has an opening 31 on one or both sides.
It has a structure that leaves behind.

The sonic control devices 37 and 38 shown in FIGS. 9A and 9B have a structure in which a pedestrian grating 32 is attached to the upper surface of the sonic control device 37 and 38 shown in FIGS. 9A and 9B. The opening 31 formed as a grating is made of this grating.

FIG. 9(C) shows another example of the sonic control device 37.38 used in the elevated structure of FIG. 8, in which the lower surface is similar to the sonic control device 27. A sonic control device 37, 38 is shown using a hollow body with a protruding lens-like cross section, leaving openings 31 on both sides and having a grating 32 bonded to the entire upper surface. In this case, the opening 31 (a grating 32 may be provided) may be provided closer to one side of G as shown in FIG. 9(A).

The elevated structure 30 explained in FIGS. 8 and 9 is different from the structure of the embodiment shown in FIGS. 1 to 3 or 4 to 7 in the above points, but the other parts are Since they have substantially the same structure, corresponding parts will be designated by the same numbers and detailed description thereof will be omitted.

Thus, with the configurations of FIGS. 8 and 9, claim 2
An elevated structure for transportation in which a sonic control device having the configuration of
A plurality of through passages 39 with varying passage lengths are provided at the top end of 5.
A sound wave control device 37,38 consisting of
By causing the sound waves that have passed through the opening or the grating 31 to interfere with each other (by overlapping the crests of the sound waves with the troughs of the other sound wave), the
A sound reduction area is created above the top of the elevated structure 3.
An elevated structure for transportation is obtained in which a sound wave control device configured to reduce the diffusion of sound waves outside of zero is disposed.

The present invention is similarly applicable to motorways (expressways in general), and FIG. 10 shows an example in which a sonic wave control device similar to the embodiments shown in FIGS. 4 to 7 is implemented on an expressway. FIG. 2 is a schematic cross-sectional view showing a state in which

Furthermore, (A), (B) and (C) in FIG.
The sonic control device according to the present invention is installed on a conventional railway,
FIG. 2 is a cross-sectional view schematically showing a state where the present invention is applied to a magnetic levitation railway (maglev train) and a new transportation system.

According to the embodiments described above, the sonic wave control device 17,18,27,28,37,38 is composed of the through passages 19,29,39 whose passage lengths are gradually changed. It was possible to reliably set the direction of refraction and to cause destructive interference of sound waves, resulting in a significant sound reduction effect.

In addition, since the structure is relatively simple and can be made of plastic, it is lightweight and easy to construct, and it has also become possible to reduce costs through mass production.

Furthermore, since it can be made smaller than the conventional structure, secondary problems such as sunlight damage can be easily resolved.

In addition, sonic control device 17.1.8.27.2B, 37
．． Any dense material such as metal, inorganic material, or plastic can be used as the material for the 38, but if it is installed in a place where there is a lot of vibration, it is recommended to use a vibration-isolating material such as rubber to reduce vibration. It is preferable to provide insulation to prevent the generation of solid-borne sound from the sonic wave control device.

Further, it is preferable that the sonic wave control device is integrated with a grating to form a maintenance passage, such as the grating 31 illustrated in FIG.

FIG. 12 and FIG. 13 show evaluation of the sound reduction effect when the sonic wave control device according to the present invention is installed in the opening of a railway viaduct.

FIG. 12 shows the sound pressure distribution due to the sonic control device installed on the side (left and right) sides in comparison with the case of only the current grating in [II].

(T]) and II) in FIG. 12 are integral type, and (
IV) is one with some openings left.

According to the graph of FIG. 12, the effect of reducing the sound pressure level by 5 to 2 OdB compared to the conventional structure of II was obtained for 500+12, IKHz, which is the main frequency of railway noise.

FIG. 13 is a graph showing, in the same way as in FIG. 12, the sound pressure distribution due to several sound wave control devices placed on the center side of the viaduct.

According to FIG. 13, a similarly large sound reduction effect is obtained, and it can be seen that the present invention is very effective in reducing noise in the low range.

According to the present invention, the above sound reduction effect can be obtained with a simple structure, and it is also economical.

Furthermore, in snowy areas, the opening 1 of the elevated deck 14
6, it is possible to obtain the effect of lightning strikes during snowfall, and the effect of reducing snow removal resistance due to train running when snow plows of high-speed railway trains are used to remove snow from the track section, and the effect of removing snow from flying snow on elevated tracks. You can also expect good results.

[Effects of the Invention] As is clear from the above description, according to the elevated transportation structure in which the sonic wave control device of the present invention is arranged, the passage length can be changed at the opening of the elevated floor slab or at the top of the soundproof wall. A sound wave control device consisting of a plurality of through passages is arranged along the transport direction, and as the sound waves pass through the through passages, the traveling direction of the sound waves is refracted to the inside of the elevated structure. Because it is composed of
Furthermore, it is possible to obtain an elevated transportation structure equipped with a sonic wave control device that can be made smaller and lighter, and has improved workability and productivity.

Further, according to the elevated transport structure in which the sonic wave control device of claim 2 is arranged, the sonic wave control device comprises a plurality of through passages with varying passage lengths in the opening of the elevated floor slab or the top end of the soundproof wall. A sound attenuation area is created below the opening or above the top end of the soundproof wall by partially arranging the device and causing the sound waves that have passed through each through-path and the sound waves that have not passed through the through-path to interfere with each other. In addition to the aforementioned refraction of sound waves, the structure is configured to reduce the diffusion of sound waves outside the elevated structure, so that in addition to the refraction of sound waves described above, the difference between sound waves passing through this device and sound waves passing through an opening without the device is An elevated transport structure is obtained in which a sound wave control device is arranged, which can achieve a skewed sound reduction effect by utilizing the interference of sound waves, and can achieve the same effect as in the case described above.

[Brief explanation of drawings]

Part 1 is a schematic cross-sectional view showing one embodiment of an elevated transportation structure equipped with a sonic control device according to the present invention, FIG. 2 is a schematic perspective view of the sonic control device shown in FIG. The figure is a cross-sectional view schematically showing the state in which sound waves pass through the sonic wave control device shown in FIG. 2, and FIG. 4 is a schematic diagram of an elevated transport structure in which a sonic wave control device according to another embodiment of the present invention is arranged. cross-sectional view, 5th
The figure is a schematic perspective view of the sound wave control device in FIG. 4, FIG. 6 is a cross-sectional view schematically showing the state in which sound waves pass through the sound wave control device in FIG. A schematic cross-sectional view showing the state of sonic wave control when implemented on a viaduct, No. 8
The figure is a schematic cross-sectional view of an elevated transport structure in which a sonic wave control device according to yet another embodiment of the present invention is arranged;
A), (B), and (C) are schematic cross-sectional views each illustrating a hollow body that can be used as a sound wave control device in FIG. 8, and FIG. 10 shows the state in which the present invention is implemented on an expressway. Schematic cross-sectional views, (A) and (B) in Fig. 11
) and (C) are schematic cross-sectional views illustrating the implementation of the present invention in a conventional railway, a maglev railway (maglev train), and a new transportation system, respectively, and FIGS. A chart showing the evaluation of the sound reduction effect when a sonic control device is placed at the opening of a railway viaduct.
FIG. 14 is a schematic cross-sectional view illustrating an elevated transportation structure equipped with a conventional noise reduction device. 10, 20.30---・-----1 elevated transportation structure, 11 bridge girder, 13---11--rail, 1 t
−−−−1 elevated floor slab, 15 soundproof walls, +6−−−−−
-Opening (elevated floor slab), 1718・-1------
Sonic control device, 19--Continuous passage, 27.
28-1----Sonic wave control device, 29----1-
--- Penetration path, 31 opening, 32 --------- grating, 37. 38-11 --- Sonic control device, 39-1 --- Penetration path. Agent Patent Attorney Yasutake Ooto

Claims (3)

[Claims] (1) At the opening of the elevated floor slab or at the top of the soundproof wall, a sonic wave control device consisting of multiple passageways with varying passage lengths is placed along the transport direction, so that sound waves can pass through the passageways. A transportation device equipped with a sound wave control device that refracts the traveling direction of the sound waves toward the inside of the elevated structure and reduces the spread of sound waves from the opening and the top end of the soundproof wall to the outside of the elevated structure. elevated structure. (2) A sound wave control device consisting of multiple through passages with varying passage lengths is partially placed at the opening of the elevated floor slab or at the top of the soundproof wall, so that the sound waves passing through each through passage and the through passage By causing the sound waves that do not pass through to interfere with each other, a sound attenuation area is created below the opening or above the top end of the soundproof wall, thereby reducing the diffusion of sound waves outside the elevated structure. An elevated structure for transportation equipped with a sonic control device for elevated structures. (3) An elevated transportation structure equipped with the sonic wave control device according to claim 1 or 2, wherein the sonic wave control device also serves as a grating for pedestrians.