JP2821900B2 - Elevated transport structure with sound wave control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an elevated transportation structure in which an acoustic wave control device for reducing noise generated from a transportation vehicle traveling on an elevated structure constituting a railway or a roadway is arranged. About things.

[Conventional technology]

In recent years, the speed of transportation vehicles running on elevated structures such as the Shinkansen has tended to become higher and higher. As the speed of the vehicle increases, vibration reduction and noise prevention have become important issues.

As a device for preventing noise generated on an elevated structure for transportation, a direct sound-insulating wall or an inverted L-shaped sound insulating wall is generally used above a track or a road surface. They are often installed side by side.

In addition, there is noise that spreads downward from the opening formed in the elevated floor slab of the elevated structure, and there have been few examples of providing soundproofing means for this opening, but as a conventional technology, it was closed with a sound insulation plate. It is conceivable that a sound absorbing duct is fitted.

FIG. 14 is a schematic cross-sectional view illustrating the elevated structure for transportation provided with the conventional noise reduction device described above, in which 1A and 1B are the left and right bridge girders, and 2A and 2B are the inverted L Type sound barrier, 3
Reference numerals A and 3B denote sound absorbing material panels bonded to the inner surfaces of the soundproof walls 2A and 2B, 4 denotes an elevated floor slab, and 5A and 5B denote sound absorbing ducts for preventing openings formed in the elevated floor slab 4.

[Technical problem to be solved by the invention]

However, in the conventional elevated structure for transportation, there were the following technical problems.

(I) First, install the noise barriers on both sides of the track or roadway on 2A, 2
In the method of providing B, even if the wall is raised or inverted L-shaped, the sound wave is diffracted from the top end of the soundproof wall, so that the noise reduction effect is limited.

Further, if the soundproof walls 2A and 2B are too high, the weight may increase further, and secondary obstacles such as deterioration of sunshine may occur.

Further, when the sound absorbing materials 3A and 3B are joined, there is a problem that durability may be caused, and there is also a problem that mass production is inferior and cost is high.

(Ii) In the method of providing the sound-absorbing ducts 5A and 5B, there is a case where the duct structure becomes large and the weight is greatly increased, so that there is a problem in design.

Further, the mounting structure of the ducts 5A and 5B is complicated, and further, there is a problem in durability of the sound absorbing material, and there is a problem that there is no mass production and the cost is high.

The present invention has been made in view of such a conventional technical problem, and has an excellent sound-reducing effect, can be reduced in size and weight, and has excellent mass productivity and workability. It is an object of the present invention to provide a transport elevated structure in which is disposed.

[Means for solving the problem]

The present invention refracts or interferes with a sound wave from a noise source such as rolling noise generated between a rail and a wheel and a reflection sound of the rolling noise from a soundproof wall, so that the noise can be reduced outside an elevated structure. The above object is achieved by using a sound wave control device that reduces the spread of sound waves to the object.

According to the first aspect of the present invention, there is provided an acoustic wave control device in which a plurality of through-paths whose path lengths gradually change are formed in the opening of the elevated floor slab or the top end of the soundproof wall in the width direction of the elevated structure. Arranged along the length direction of the object, the sound wave control device,
In the plane in the direction traversing the elevated structure, the timing of arriving from the sound source to the exit of each through-path via the entrance of each through-path is gradually changed in the width direction of the elevated structure, so that By refracting the traveling direction of the sound wave radiated from the exit of the road toward the center in the width direction of the elevated structure,
A transport elevated structure in which a sound wave control device is disposed, wherein the acoustic structure is configured to reduce the spread of sound waves from the opening and the top end of the soundproof wall outward in the width direction of the elevated structure. Thereby, the above object is achieved.

A second aspect of the present invention provides an acoustic wave control device in which a plurality of through-paths whose passage lengths gradually change are formed in the opening of the elevated floor slab or the top end of the soundproof wall in the width direction of the elevated structure. Arranged along the length direction of the object, the sound wave control device,
In a plane crossing the elevated structure, the lower surface central portion has a protruding cross-sectional shape and each of the through-paths is formed, and the sound source reaches an outlet of each of the through-paths through an entrance of each of the through-paths. By gradually changing the time to the width direction of the elevated structure, the traveling direction of the sound wave radiated from the exit of each through-passage, the sound wave is the center side of the elevated structure or the top end of the soundproof wall By being refracted so as to converge on a convergence region set at a predetermined position above, it is configured to reduce the spread of sound waves outward from the opening and the top end of the soundproof wall in the width direction of the elevated structure. The above object is achieved by an elevated transport structure in which a sound wave control device is arranged.

〔Example〕

Hereinafter, the present invention will be specifically described with reference to FIGS.

FIG. 1 is a schematic cross-sectional view of a transport elevated structure in which a sound wave control device according to the present invention is arranged.

In Fig. 1, an elevated structure for transportation such as a high-speed railway
10 is constructed by supporting left and right (up and down) bridge girders 11 and 11 with piers 12 arranged at predetermined intervals, and laying rails 13 and 13 on the upper surfaces of the bridge girders 11 and 11, respectively. An elevated floor slab 14, which forms a flat surface, is mounted between and outside of the slabs 11 and 11, and upright or inverted L-shaped soundproof walls 15, 15 are provided on both sides of the elevated floor slab 14. Have been.

An opening 16 is formed along the transport direction between and outside the bridge girders 11, 11 of the elevated floor slab 14, and the opening 16
Along with 16, a sound wave control device 17 is arranged.

Further, in the illustrated example, sound wave control devices 18 are also arranged along the transport direction at the top ends of the left and right soundproof walls 15, 15.

FIG. 2 is a perspective view schematically showing the structure of the sound wave control devices 17 and 18. The sound wave control devices 17 and 18 are hollow bodies provided with a plurality of through paths 19 in which the lengths of the passages are sequentially changed. It is configured.

The sound wave control devices 17 and 18 have a predetermined width W and a predetermined length L.
Are arranged side by side in the direction of the length L.

FIG. 3 is a cross-sectional view schematically showing a state in which sound waves of the sound wave control devices 17 and 18 pass.

In FIG. 3, the passage length of a plurality of through passages 19 formed sequentially in the width direction is such that sound waves from the sound source A
The passage through the passage 19 causes a difference in the arrival time of the sound wave at the exit of each through-passage 19, and the traveling direction of the sound wave is changed (refracted) in a predetermined direction.

Therefore, each of the sound wave control devices 17 and 18 in the elevated structure 10 shown in FIG. Is bent toward the center of the elevated structure (usually on the same side of the pier 12), and the opening 16 of the elevated floor slab 14 and the soundproof wall 1
They are arranged so as to reduce (suppress) the spread of sound waves from the top ends of the 5,15 to the outside of the elevated structure 10.

FIG. 4 is a schematic cross-sectional view of a transport elevated structure 20 provided with a sound wave control device according to another embodiment of the present invention.

The elevated structure 20 shown in FIG. 4 includes a sound wave control device 27 arranged at the opening 16 of the elevated floor slab 14 and a sound wave control device 28 arranged at the top end of the soundproof walls 15 and 15 as the control device shown in FIG. 17,18
Instead, a lens-shaped acoustic refraction hollow body as shown in FIGS. 5 and 6 is used, and the other portions have substantially the same structure as that of the elevated structure 10 in FIG.

Therefore, in FIG. 4, parts corresponding to the respective parts in FIG. 1 are indicated by the same reference numerals, respectively, and detailed description thereof will be omitted.

FIG. 5 is a schematic perspective view of the sound wave control devices 27 and 28 in FIG. 4. The sound wave control devices 27 and 28 are formed of a hollow body having a lens-like cross section with a protruding lower surface.

In the case of the sound wave control devices 27 and 28, as shown, by inclining the longitudinal partition wall 21 in a predetermined direction,
A plurality of through passages 29 whose passage length changes sequentially are formed.

These sound wave control devices 27 and 28 also have units having predetermined width W and length L arranged side by side in the longitudinal direction of the elevated structure 20.

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

In FIG. 6, the passage length of a plurality of through passages 29 sequentially arranged in the width direction and inclined at a predetermined direction is determined by the sound wave from the sound source A passing through each through passage 29. 29
Are determined so that the traveling direction of the sound wave changes (refraction) in a predetermined direction, and the passed sound wave is collected in a focusing area B set at a predetermined position.

Therefore, in the elevated structure 20 shown in FIG.
Each sound wave control device 27 arranged at the opening 16 of the 14 and each sound wave control device 28 arranged at the top end of the soundproof walls 15, 15 are provided with a rolling noise generated between the rail 13 and the wheels. The traveling direction of the sound wave passing through each through passage 29 from the sound source is refracted in a predetermined direction, and the sound wave going downward from the opening 16 is concentrated on the center side of the elevated structure 20 (usually the pier 12 on the same side), The sound waves going upward from the top end of the fifteen are also concentrated at a predetermined point above, thereby acting to reduce (suppress) the diffusion of the sound waves outside the elevated structure 20.

FIG. 7 shows the sound wave control devices 27 and 2 described with reference to FIGS.
FIG. 8 is a schematic cross-sectional view illustrating a state of sound wave control when 8 is applied to a viaduct of a Shinkansen. When a Shinkansen vehicle (high-speed vehicle) 22 runs along a rail 13 laid on the upper surface of a bridge girder 11, The noise (arrow 24) generated from between the wheel 13 and the wheel 23 is collected in a predetermined focusing area B below and above the elevated structure 20 by passing through the sound wave control devices 27 and 28 as shown in the figure. Will be done.

Therefore, the noise generated when the vehicle is traveling
The degree of diffusion out of 20 is effectively reduced.

FIG. 8 is a schematic cross-sectional view of an elevated structure 30 provided with a sound wave control device according to still another embodiment of the present invention.

The elevated structure 30 for transportation shown in FIG.
At the top end of 16 and the soundproof wall 15, not the whole area but the sound wave control devices 37 and 38 are partially disposed, and the remaining area has a structure in which the aperture is left open or a simple grid-like grating is disposed. I have.

(A) and (B) of FIG. 9 are cross-sectional views schematically showing structural examples of the sound wave control devices 37 and 38 in FIG. 8, respectively. It has a structure in which an opening 31 is left on one or both sides of a hollow body composed of a plurality of through passages 39 having different passage lengths, that is, the hollow body shown in FIG.

The sound wave control devices 37 and 38 shown in FIGS. 9A and 9B have a structure in which a pedestrian grating (lattice-like tread plate) 32 is joined to the upper surface thereof, and are formed as a part thereof. The opening 31 is formed by this grating.

FIG. 9C shows another example of the sound wave control devices 37 and 38 used for the elevated structure in FIG. 8, and the lower surface is similar to the sound wave control devices 27 and 28 in FIG. Shown are sound wave controllers 37 and 38 in which a hollow body having a protruding lens-like cross section is used, and openings 32 are left on both sides thereof, and gratings 32 are joined to the entire upper surface. In this case, the opening 31 (even if the grating 32 is provided) can be provided so as to be shifted to one side as shown in FIG. 9 (A).

The elevated structure 30 described with reference to FIGS. 8 and 9 is different from the structure of the embodiment shown in FIGS. 1 to 3 or FIGS. They have substantially the same structure, and corresponding parts are denoted by the same reference numerals, and detailed description thereof is omitted.

Thus, according to the configuration of FIG. 8 and FIG. 9, the elevated structure for transportation in which the sound wave control device having the configuration of claim 2 is arranged, that is, the opening 16 of the elevated floor slab 14 or the top end of the soundproof wall 15 The sound wave control devices 37 and 38 each including a plurality of through paths 39 having different passage lengths are partially arranged, and the sound waves that pass through the respective through paths 39 and the sound waves that do not pass through the through paths 39 (the opening or the grating 31 are formed). (Passed sound wave) and interfere with each other (the sound wave peak overlaps the other sound wave valley) to generate a sound reduction area below the opening 16 or above the top end of the soundproof wall 15, As a result, a transport elevated structure in which the acoustic wave control device configured to reduce the diffusion of the acoustic waves to the outside of the elevated structure 30 is obtained.

The present invention can be similarly applied to a motorway (generally, a highway). FIG. 10 shows a sound wave control device similar to the embodiment shown in FIGS. 4 to 7 implemented on a highway. FIG. 4 is a schematic cross-sectional view showing a state in which

11 (A), (B) and (C) show the state where the sound wave control device according to the present invention is applied to a conventional railway, a magnetic levitation railway (linear motor car) and a new transportation system, respectively. It is a cross-sectional view shown typically.

According to each of the embodiments described above, the sound wave control devices 17, 18, 2 including the through passages 19, 29, 39 in which the passage length is gradually changed.
7, 28, 37, and 38, the direction of sound wave refraction could be set reliably and the destructive interference phenomenon of sound waves could be caused, and a remarkable sound reduction effect could be achieved.

In addition, since the structure is relatively simple and can be made of plastic or the like, it is lightweight and has excellent workability, and the cost can be reduced by mass production.

Further, since the size can be reduced compared to the conventional structure, secondary obstacles such as a sunshine obstacle can be easily solved.

In addition, as a constituent material of the sound wave control devices 17, 18, 27, 28, 37, and 38, any material can be used as long as it is a dense material such as a metal, an inorganic material, and a plastic, but is attached to a place where there is a lot of vibration. In this case, it is preferable that vibrations are insulated by a vibration-proof material such as rubber to prevent the generation of solid-borne noise from the sound wave controller.

Further, it is preferable that the sonic wave control device constitutes a maintenance passage integrally with the grating as in the grating 31 illustrated in FIG.

FIGS. 12 and 13 show the evaluation of the next sound reduction effect when the sound wave control device according to the present invention is mounted on the opening of the railway viaduct.

In the sound pressure distribution diagrams of FIG. 12 and FIG. 13, each curve shows a constant sound pressure line, and a region with a high point density shows a region with a high sound pressure.

FIG. 12 shows the sound pressure distribution by the sound wave control device mounted on the side (left and right) side in comparison with the case of the current grating [I] alone.

(II) and (III) in FIG.
V] has a part of the opening left.

According to the graph of FIG. 12, the main frequency of railway noise, 500 Hz and 1 KHz, is 5 times smaller than the conventional structure of [I].
A sound pressure level reduction effect of ~ 10dB or more was obtained.

FIG. 13 is a graph showing the sound pressure distribution by the sound wave control device attached to the viaduct center (center) side as in the case of FIG.

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

According to the present invention, the above-described noise reduction effect can be obtained with a simple structure, which is also useful from the viewpoint of economy.

Further, in the snowy area, the opening 16
It does not block the snow, so it is possible to obtain the effect of falling snow during snowfall, the effect of reducing the snow removal resistance due to the train running when the snow plow of the high-speed railway train runs on the track, and the effect of removing the snow on the elevated train Can also be expected.

〔The invention's effect〕

As is apparent from the above description, according to the elevated structure for transportation in which the sound wave control device of claim 1 is arranged, a plurality of passages whose passage lengths gradually change are formed at the opening of the elevated floor slab or the top end of the soundproof wall. A sound wave control device formed by arranging the through passages in the width direction of the elevated structure is arranged along the length direction of the elevated structure,
The sound wave control device gradually changes the timing at which the sound source reaches the outlet of each through-passage through the entrance of each through-passage in the width direction of the elevated structure in a plane crossing the elevated structure. By refracting the traveling direction of the sound wave radiated from the exit of each of the through paths toward the center in the width direction of the elevated structure, the width of the elevated structure from the opening and the top end of the soundproof wall is reduced. Since it is configured to reduce the spread of sound waves outward in the direction, the sound waves from noise sources such as rolling noise generated between the rails and wheels and the reflection sound of the rolling noise from the soundproof wall are reduced. By refracting, it is possible to reduce the spread of sound waves outside the elevated structure, and it is excellent for sound reduction effect, and it is equipped with a sound wave control device that can reduce size and weight, improve workability and improve mass productivity An elevated structure is provided.

According to the elevated structure for transportation in which the sound wave control device according to claim 2 is arranged, a plurality of through-paths whose passage lengths gradually change are formed at the opening of the elevated floor slab or at the top end of the soundproof wall. The sound wave control devices formed side by side in the direction are arranged along the length direction of the elevated structure, and the sound wave control device has a cross-sectional shape in which the lower surface central portion protrudes in a plane crossing the elevated structure. And each of the through-paths is formed, and by gradually changing the time from the sound source to the exit of each of the through-paths via the entrance of each of the through-paths in the width direction of the elevated structure, The direction of travel of the sound wave emitted from the outlet is refracted so that the sound wave converges on the center side of the elevated structure or on a focusing area set at a predetermined position above the top end of the soundproof wall, whereby the aperture is opened. Section and the top of the soundproof wall Since it is configured to reduce the spread of sound waves outward in the width direction of the structure, noise from sources such as rolling noise generated between the rails and wheels and reflections of the rolling noise from the soundproof wall is reduced. By refracting the sound waves of
It is possible to reduce the spread of sound waves outside the elevated structure,
Provided is an elevated transport structure in which a sound wave control device which is excellent in a noise reduction effect and can be reduced in size and weight, improved in workability, and improved in mass productivity is arranged.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing one embodiment of a transport elevated structure in which a sound wave control device according to the present invention is arranged, FIG. 2 is a schematic perspective view of the sound wave control device in FIG. FIG. 4 is a cross-sectional view schematically showing a state in which sound waves pass through the sound wave control device in FIG. 2, and FIG. 4 is a schematic view of a transport elevated structure in which a sound wave control device according to another embodiment of the present invention is arranged. Cross section, fifth
4 is a schematic perspective view of the sound wave control device in FIG. 4, FIG. 6 is a cross-sectional view schematically showing a state where sound waves pass through the sound wave control device in FIG. 5, and FIG. FIG. 8 is a schematic cross-sectional view showing a state of sound wave control in the case of carrying out with a viaduct of FIG.
FIG. 9 is a schematic cross-sectional view of a transport elevated structure in which a sound wave control device according to still another embodiment of the present invention is arranged, and FIGS. 9 (A), (B), and (C) each show FIG. FIG. 10 is a schematic cross-sectional view illustrating a hollow body that can be used as a sound wave control device in the inside, FIG. 10 is a schematic cross-sectional view illustrating a state in which the present invention is implemented on a highway, and FIGS. B) and (C) are schematic cross-sectional views illustrating a state in which the present invention is implemented in a conventional railway, a magnetic levitation railway (linear motor car), and a new transportation system, respectively. FIG. 14 is a table showing evaluation of noise reduction elevated when the sound wave control device according to the present invention is arranged in an opening of a railway viaduct, and FIG. 14 is a schematic cross-sectional view illustrating a transport elevated structure equipped with a conventional noise reduction device. It is. 10,20,30 ... Transportation elevated structure, 11 ... Bridge, 13 ... Rail, 14 ... Elevated floor slab, 15 ... Soundproof wall, 16 ... Opening (elevated floor slab), 17,18 ... Sound wave control device, 19 ... Penetration path, 27,28 ... Sound wave control apparatus, 29 ... Penetration path, 31 ... Opening, 32 ... Grating, 37,38 ... Sound wave control apparatus, 3
9 ... The through road.

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masanori Murase 1469 Hirano, Irumagawa, Sayama City, Saitama Prefecture Igrek Sayama 201 (72) Inventor, Kazuka Iida 306-517, Oaza, Shinji, Iruma City, Saitama Prefecture References (56) JP-A-61-266709 (JP, A) JP-A-59-38517 (JP, U) JP-B-61-1566 (JP, B2) JP-B-54-34966 (JP, B2) JP-B-58-42324 ( JP, B2) JP 4-44759 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E01B 19/00 E01F 8/00

Claims (4)

(57) [Claims] (1) At the opening of the elevated floor slab or at the top of the soundproof wall,
A sound wave control device formed by arranging a plurality of through paths whose passage lengths gradually change in the width direction of the elevated structure is arranged along the length direction of the elevated structure, and the sound wave control device is configured to control the elevated structure. In the plane in the transverse direction, by gradually changing the time from the sound source to the exit of each through-pass through the entrance of each through-pass in the width direction of the elevated structure, from the exit of each of the through-passes By refracting the traveling direction of the radiated sound wave toward the center in the width direction of the elevated structure, it is possible to reduce the spread of the sound wave from the opening and the top end of the soundproof wall to the width direction of the elevated structure. A transport elevated structure in which a sound wave control device is arranged, characterized in that: 2. An elevated floor slab having an opening or a top end of a soundproof wall,
A sound wave control device formed by arranging a plurality of through paths whose passage lengths gradually change in the width direction of the elevated structure is arranged along the length direction of the elevated structure, and the sound wave control device is configured to control the elevated structure. In the plane in the transverse direction, the lower surface central portion has a cross-sectional shape protruding and each of the through paths is formed,
By gradually changing the time from the sound source to the exit of each through-pass through the entrance of each through-pass in the width direction of the elevated structure, the traveling direction of the sound wave radiated from the exit of each through-pass is changed. The sound waves are refracted so as to converge on a center area of the elevated structure or a focusing area set at a predetermined position above the top end of the soundproof wall, so that the acoustic waves are elevated from the opening and the top end of the soundproof wall. An elevated transport structure in which a sound wave control device is arranged, wherein the structure is configured to reduce the spread of sound waves outward in the width direction of the structure. 3. An opening portion is provided on both sides or any one side in the width direction of said sound wave control device comprising a plurality of through passages having varied passage lengths, and a sound wave passing through each through passage and passing through said opening portion. And causing the sound waves to interfere with each other to generate a sound reduction area below the opening or above the top end of the soundproof wall, thereby reducing the diffusion of the sound waves outside the elevated structure. Item 3. An elevated transport structure in which the sound wave control device according to item 1 or 2 is arranged. 4. A transport elevated structure according to claim 3, wherein a pedestrian grating is provided on an upper surface of said sonic control device including said opening.