JP3392070B2 - Soundproof wall and silencer on top of soundproof wall - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of soundproof walls for roads, railways, etc., and soundproof wall top silencers. More specifically, the present invention relates to a soundproof wall and a soundproof wall top muffling device using a film vibration sound absorber having not only sound absorption characteristics but also visibility and translucency through the sound absorber as necessary.

[0002]

2. Description of the Related Art As a soundproof wall for roads, railways, etc., a metal plate having a large number of slits on the sound source side and a metal plate for the back plate are made of a soft fiber system such as glass wool in a metal housing. It is common to insert a porous sound absorbing material, which is protected by a weather resistant film (PVF) in order to prevent deterioration due to ultraviolet rays or rainwater. In addition, a translucent soundproof wall using a transparent polycarbonate plate, etc. can be cited as a measure against sunshine and landscape against the private houses on both sides of the road and as a measure against the view.

By the way, the increase in traffic noise due to the further increase in traffic volume and the increase in large vehicles is becoming more and more serious, especially in urban areas. There are problems of road structure restrictions, the sunshine and the landscape, and therefore, it is desired to develop a soundproof wall which is highly effective at a lower height and has visibility and translucency.

As a measure for preventing the soundproof walls from being raised, a sound deadening device is installed at the top of the sound deadening walls so that the sound waves from the noise source are damped and the sound waves from the noise source are diffracted at the upper end of the soundproof wall to the opposite side of the sound source. By increasing the diffractive distance until reaching, the method of enhancing the soundproofing effect by noise reduction, and the method of silencing based on the interference principle of refracting and interfering with the sound wave emitted from the noise source to create a noise reduction area have been put to practical use. ing.

For example, Japanese Unexamined Patent Publication (Kokai) No. 6-235209 discloses a sound absorbing wall top silencer having a convex circular shape in which a sound absorbing material such as glass wool is sandwiched between an inner surface plate such as a zinc iron plate and a porous aluminum plate. ing.

Further, Japanese Unexamined Patent Publication No. 7-180779 discloses a cylindrical soundproof wall top silencer made of an aluminum sound absorbing material obtained by pressure-bonding aluminum fibers.

Further, in Japanese Unexamined Patent Publication No. 9-264006, a first branch wall inclined toward the sound source side is provided, and
There is disclosed a soundproof wall top muffling device provided with a second branch wall inclined to the side opposite to the sound source side.

[0008]

First, regarding a general soundproof wall, a conventional soft fiber type porous sound absorbing material such as glass wool is protected by a weather resistant film (PVF) and enclosed in a steel plate casing. Although the noise reduction effect on the inside of the road or railway (source of sound) is excellent, it not only causes problems of sunshine on the private houses on both sides of the road and problems on the landscape, but also blocks the view outside the road. As a result, passengers cannot see the outside scenery, which causes a problem in view.

Further, a soundproof wall using a translucent sound insulating plate has a problem of sunshine on a private house, and even though it has excellent visibility and scenery, it has only a sound insulating effect, so that it can be used on the inside of a road or railway (on the sound source side). Noise reduction effect cannot be expected. Therefore, the sound pressure level on the sound source side remains high, and as a result, the noise reduction effect on the private house is not sufficient.

Further, a cylindrical silencer having a convex cross section or a circular cross section, or a silencer having a branch cross section, which is recently attached to the top of a soundproof wall of a highway, is also non-translucent. Therefore, the problem of sunshine on the private houses on both sides of the road is exacerbated.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and it is a sound-transmitting plate having a light-transmitting property, a membrane vibration sound absorber, and a soft fiber type porous sound absorbing material or an open cell type elastic foam sound absorbing material. Is to provide a translucent soundproof wall without impairing the visibility. Another object of the present invention is to provide a soundproof wall top silencer by using a translucent membrane vibration absorber and a sound insulating plate as constituent materials of the soundproof wall top silencer.

[0012]

The applicant of the present invention has found that a sound absorbing material formed by laminating an expanded metal made of aluminum and an ethylene fluoride thin film and / or a polyvinylidene thin film (see Japanese Patent Publication No. 6-49348). ) Or a sound absorbing material having a large number of openings and sandwiching a resin thin film between plate-shaped bodies having different opening ratios (see Japanese Patent No. 2518589), and the sound absorbing material has a curved surface. A film vibration absorber (Japanese Patent Laid-Open No. 10-222170) is proposed.

These sound absorbing materials and sound absorbing bodies utilize the film vibration of a thin film. By using these in various applications, not only a good sound absorbing effect but also the visibility through the sound absorbing material and the sound absorbing body is obtained. It has become possible to secure.

Therefore, it is necessary to dispose the sound absorbing material and the sound absorbing body inside the existing translucent soundproof wall (on the sound source side), and as a constituent material of the existing soundproof wall top silencer, there is a light transmissive property. The present invention has been made through intensive studies on the use of this sound absorbing material and sound absorbing body.

[0015] In a first aspect of the present invention, by processing at least a plate-like body having a single number of openings, a plate-like formed by laminating at least one resin thin film vibration sound absorbing material A membrane vibration absorber is formed and attached to the sound source side of the soundproof wall to reduce noise by the membrane vibration action.
Ru can be used sound barrier member.

[0016] In a second aspect of the present invention, by processing a plate-like body having at least one of the plurality of openings, a plate-like formed by laminating at least one resin thin film vibration sound absorbing material A soundproof wall member , comprising a sound absorbing wall formed by forming a sound absorbing body, which is attached to a sound source side of a sound insulating wall to reduce noise by a film vibration action.
And wherein the lined soft fiber based porous sound-absorbing material or open cell elastic foam sound absorbing material on the inside of the side wall of (sound barrier member), Ru can be used sound barrier member.

[0017] In a third aspect of the present invention, characterized in that the shape of the membrane vibration sound absorbing member is a plate-like waveform or cylindrical, according to the first aspect, reducing noise by membrane vibration effect Ru can be used sound barrier member to.

[0018] In a fourth aspect of the present invention, soundproof shape of the membrane vibration sound absorbing body is plate-like, a waveform or cylindrical, according to the second aspect, constituting the soundproofing wall and membrane vibration effect Due to the synergistic effect of sound absorbing action based on frictional resistance when air particles vibrate in the pores of the soft fiber type porous sound absorbing material or the open cell type elastic foam sound absorbing material lined inside the side wall of the panel (sound barrier member) Ru can be used soundproof wall member, characterized in that to reduce the noise.

By lining the sound absorbing material on the inner side wall of the panel forming the soundproof wall, the sound absorbing property of the soundproof wall can be further improved.

[0020] In a fifth aspect of the present invention, the sound absorbing layer of the membrane vibration sound absorbing material is transparent, and a sound insulation plate of the soundproof wall is transparent, according to the first aspect and the third aspect of, characterized by reducing noise by membrane vibration effect, Ru can be used a light-transmitting type sound barrier member.

[0021] In a sixth aspect of the present invention, the film is a sound absorbing membrane vibration sound absorbing material is transparent, and wherein a sound insulating plate soundproof walls transparent, according to the second aspect and the fourth aspect And the soundproof panel that constitutes the soundproof wall (soundproof wall section).
The noise is reduced by the synergistic effect of the sound absorbing action based on the friction resistance when air particles vibrate in the pores of the soft fiber type porous sound absorbing material or the open cell type elastic foam sound absorbing material lined inside the side wall of characterized in that, Ru can be used a light-transmitting type sound barrier member.

[0022] In a seventh aspect of the present invention includes a plate-like body having at least one of the plurality of openings, the plate-like membrane vibration sound absorbing material formed by laminating at least one resin film into a cylindrical shape It is characterized in that it is processed, and a cross-shaped sound insulation plate is inserted into the inside of this cylindrical membrane vibration absorber, and noise is reduced by the synergistic effect of the membrane vibration action of the cylindrical membrane vibration absorber and the sound insulation plate. , Ru can be used soundproofing Kabeitadaki portion silencer.

[0023] In an eighth aspect of the present invention, wherein the cylindrical membrane vibration sound absorbing body of the sound absorbing film according to the seventh aspect, and sound insulating plate is transparent, the cylindrical membrane vibration sound absorber A translucent soundproof wall top silencer, characterized in that noise is reduced by the synergistic effect of the film vibration action of the above and the sound insulation plate .
Door is Ru can.

[0024] In a ninth aspect of the present invention, according to a fifth aspect and a sixth aspect, the sound absorbing layer film vibration sound absorbing material is transparent and permeable noise insulating plates soundproof wall is transparent A sound-absorbing film of the cylindrical film vibration absorber according to the eighth aspect, and a translucent sound-proof wall top muffling device having a transparent sound insulating plate are provided on the top of the light-type sound insulating wall. A translucent soundproof wall
Ru can be.

In a tenth aspect of the present invention, a transparent resin plate is provided on the side opposite to the sound source side of the translucent soundproof wall described in the ninth aspect , beside the translucent soundproof wall top silencer. And a translucent soundproof wall, which is provided with a sloping branch wall consisting of
It is Ru can be.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a translucent soundproof wall and a soundproof wall top silencer of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the membrane vibration-sound absorbing material is a plate-shaped laminate of a plate-shaped body having a large number of openings and a resin thin film, and the membrane vibration-sound absorbing body is manufactured using the film vibration-sound absorbing material. A sound absorbing panel and the like, a film vibration sound absorbing material having a curved surface, and a sound absorbing structure using these are shown.

Further, the open-cell type elastic foam sound absorbing material has a very dense internal cell (pore) structure made of resin, and these cells (pores) are connected to each other so that the front and back surfaces of the material are It is a foaming body having a structure (open cell) through which air can pass, and sound waves (vibrating air particles) receive frictional resistance when passing through the pores, are converted into heat energy, and are absorbed.

First, the layer structure and forming material of the membrane vibration sound absorbing material of the present invention will be described with reference to FIG.

The inventors of the present invention described the membrane vibration sound absorbing material or the membrane vibration sound absorbing body used in the present invention.
As proposed in (1), a plate-like body having a large number of openings and a resin thin film are laminated at least one by one. However, considering sound absorption characteristics and mechanical strength, it is preferable that the laminate shown in FIG. a), and as shown in FIG. 1B which is a cross-sectional view taken along the line bb, the resin thin film 14 is formed of a plate-shaped body 12 (hereinafter, referred to as a plate-shaped body 12) having a large number of openings. It is preferable to have at least one sandwiched layer structure.

Further, preferably, as shown in FIG. 1C, the surface of one plate member 12 is covered with a resin thin film. With such a configuration, better sound absorbing characteristics can be obtained.

Further, as shown in FIG. 1D, both surfaces of the structure shown in FIG. 1B may be covered with the resin thin film 14. With such a configuration, the sound absorbing characteristics are further improved, and particularly in the case of the sound absorbing body used in the present invention using the metal plate-shaped body 12, the plate-shaped body 12 is protected from rain or the like. Therefore, the weather resistance can be significantly improved.

The layer structure of the membrane vibration absorber used in the present invention is not limited to the above example, and for example, the plate-shaped body 12 is further included.
The resin thin film 14 may be laminated, or a plurality of resin thin films 14 may be laminated by sandwiching the two resin thin films 14 between the plate-shaped bodies 12.

There are no particular restrictions on the material of the membrane vibration-absorbing material used in the present invention or the plate-shaped body 12 constituting the membrane vibration-absorbing body, and various materials can be used, but aluminum and steel are preferable. Examples include various metal materials, alloy materials such as stainless steel, and various resin materials such as the materials exemplified in the resin thin film 14 described later.

More specifically, the plate-shaped body 12 is more specifically a punching metal formed by punching a metal plate formed of the above-mentioned various materials, a metal net, an expanded metal (lath net). Examples include resin nets and perforated plates. Further, the plate-shaped body 12 may be made of the same material, or a plurality of different plate-shaped bodies may be used, such as a configuration in which the resin thin film 14 is sandwiched between punching metal and a resin net. .

Further, as shown in FIG. 1, when a plurality of plate-like bodies are used, those having the same size of opening (aperture ratio per unit area) or different from each other may be used. By using plate-shaped bodies having different aperture ratios, better sound absorption characteristics can be obtained.

Here, when a plate material such as expanded metal or wire mesh having twists or irregularities on the surface of the plate material is used as the plate-like body, press working or roller working is applied to flatten the surface irregularities. Is preferably used.

In the membrane vibration absorbing material or the membrane vibration absorbing body used in the present invention, the contact state between the plate-shaped body and the resin thin film has a great influence on the sound absorbing effect. Therefore, by using such a flattened product, the contact area between the two is improved, and better sound absorption characteristics can be obtained.

The thickness of the plate-like body is not particularly limited and may be appropriately determined according to the required mechanical strength, the size of use of the membrane vibration absorber, and the like. ,
Considering the weight and the like, it is usually about 0.2 mm to 2 mm, preferably 0.4 mm to 1 mm.

On the other hand, as the resin thin film 14 used for the film vibration absorbing material, a vinyl chloride thin film, a polyethylene thin film, a polypropylene thin film, an erylene fluoride thin film, a polyvinylidene fluoride thin film, an acrylic thin film, etc. are known. Although any of the various resin thin films described above can be applied, the ethylene fluoride thin film and the polyvinylidene fluoride thin film are particularly preferably used in terms of sound absorption characteristics, weather resistance, durability and the like.

As the ethylene fluoride resin used for the ethylene fluoride thin film, various known resins can be exemplified, but tetrafluoroethylene (PTFE), tetrafluoroethylene / polyethylene copolymer (ETFE). ) Preferable examples are trifluoroethylene (PCTFE) and the like.

These fluorinated ethylene resins are quasi-nonflammable and have excellent chemical resistance, weather resistance and heat resistance. As the polyvinylidene-based resin used as the polyvinylidene-based thin film, various known resins are exemplified, but vinylidene difluoride (PVDF), vinylidene fluoride-cyanaide, etc. are preferably exemplified. These vinylidene resins are excellent in chemical resistance and weather resistance.

The thickness of such a resin thin film 14 is not particularly limited, but in order to obtain a suitable film vibration and realize a good sound absorbing characteristic, it is 4 μm to 25 μm, preferably 5 μm to 1.
The thickness is preferably 5 μm.

The membrane vibration absorbing material and the sound absorbing mechanism of the membrane vibration absorbing body used in the present invention are described in the above-mentioned JP-A-1.
No. 0-222170 described by the present inventors. That is, as shown in FIG. 2A, when the sound wave G enters the resin thin film 14, the resin thin film 14 vibrates due to the action of the sound wave (vibrating air) that hits the resin thin film surface. That is, the sound energy is converted into the vibration of the resin thin film 14, and the sound absorbing action is expressed (hereinafter referred to as the sound absorbing action a).

The sound wave G incident on the resin thin film 14 is
Although flowing along the surface of the resin thin film 14, the sound energy is attenuated by the viscous action (resistance force against the flow) of the flow of the sound wave, and the sound absorbing action is expressed (hereinafter, the sound absorbing action b.
And).

Moreover, when the resin thin film 14 vibrates as in the sound absorbing action a, the vibration is absorbed by the plate-shaped body 12 in contact with the resin thin film, resulting in the absorption of sound energy and the sound absorbing action a. The expression is increased (hereinafter referred to as sound absorbing action c).

Further, if the back air layer is secured, the film vibrates due to the energy of sound as described above, and this vibration compresses the back air layer to exert a sound absorbing action (hereinafter, sound absorbing action d And). The membrane vibration absorbing material and the membrane vibration absorbing body used in the present invention exhibit extremely excellent sound absorbing characteristics due to the synergistic effect of the sound absorbing functions a to c and the sound absorbing function d.

As shown in FIGS. 2 (b) and 2 (c), when a plurality of resin thin films 14 are provided, the sound absorbing functions a to c are exhibited in each resin thin film 14. Therefore, as described above, the resin thin film 14 is sandwiched between the plate-like bodies 12 as shown in FIG.
The structure of FIG. 1C in which the surface of one plate 12 is covered with the resin thin film 14 is better than the structure of FIG. 1
With the configuration of (d), better sound absorption characteristics can be obtained.

A soft fiber type porous sound absorbing material such as glass wool has a noise reducing effect when it is used by being enclosed in a soundproof wall as described in the above-mentioned conventional techniques and problems to be solved by the invention. However, it has no transparency or translucency.

Further, as shown by the curve d in FIG. 13, the sound absorption coefficient of the plate-shaped film vibration absorbing body panel (soundproof wall member) has not reached a sufficiently satisfactory level. Therefore, as a result of the inventors of the present invention earnestly conducting an experimental study, a soft fiber-based porous sound absorbing material or an open-cell elastic foam sound absorbing material is partially inside the panel within a range not impairing the transparency and the light transmitting property. It has been found that the lining provides a significant improvement in the sound absorption coefficient of the plate-shaped film vibration absorber panel.

More specifically, the side wall inside the panel has a thickness of 10
By lining the soft fiber type porous sound absorbing material or the open-cell type elastic foam sound absorbing material 106 having a thickness of up to 30 mm, the sound absorbing coefficient can be greatly improved without sacrificing the transparency and the light transmitting property.

Sound waves which could not be completely absorbed by the plate-shaped film vibrating body 103 of FIG. 12 are transmitted to the inside of the panel, but the transmitted sound waves are reflected by the transparent resin sound insulation plate 104, and the side wall 1 is formed.
Sound is absorbed by the sound absorbing action based on the frictional resistance when passing through the pores of the open-cell type elastic foam sound absorbing material 106 lined inside 05 and the partition plate 102.

[0052] above Kimaku vibration sound absorbing body (soundproof wall member) (35,
45, 55, 103) on the sound source side of the soundproof wall (running side of a car or train), the noise level to the outside of the soundproof wall is effectively reduced, and the transparent sound insulating plate (3
2, 42, 52, 104) and the transparent resin thin film 14 can be used as a translucent soundproof wall.

Further, the translucent soundproof wall top silencer 60 of the present invention also absorbs sound waves from the sound source by the sound absorbing action of the cylindrical film vibration absorber (64) and the cross-shaped sound insulating plate 63 arranged in the cylinder. The noise level reaching the opposite side (private house side) of the sound source can be reduced by the sound attenuation and the sound wave from the sound source being diffracted and attenuated a plurality of times by being diffracted at the upper end of the top silencer. Transparent resin thin film 14 and transparent cross-shaped sound insulation plate 63
Transparency is also secured by using.

Further, a branch wall 90 made of a transparent resin plate is provided on the private house side opposite to the sound source, directly below the translucent soundproof wall top muffler 60 of the present invention, so that the sound wave is further diffracted. It is possible to reduce noise.

The plate-like material used in the examples of the present invention is
The surface was flattened by applying roller processing to all of the aluminum expanded metal having a mesh of 5 mm × 10 mm and the expanded metal made of aluminum of 4 mm × 8 mm to smooth the surface.

A transparent thin film made of PTFE (polytetrafluoroethylene) having a thickness of 12 μm was sandwiched between these two kinds of expanded metal made of aluminum, and further, 5 mm × 1
The same PTFE thin films were laminated so as to cover the surface of 0 mm mesh aluminum expanded metal, and a plate-shaped laminate (sound absorbing material) 34 having a layer structure shown in FIG. 1C was manufactured.
The following three types of sound absorbing panels (soundproof wall members) were manufactured using this plate-shaped laminated body (sound absorbing material) 34, and the sound absorption coefficient in the reverberation room method was measured.

[Embodiment 1] <Soundproof wall of plate-shaped film vibration absorbing panel > As shown in FIG. 3 (a), 1000 mm (length) × 10
A housing 31 having a size of 00 mm (width) × 95 mm (depth) and having an open upper surface was manufactured. In addition, the bottom surface of the housing is a transparent resin sound insulation plate 32 having a thickness of 5 mm, and the side wall 33 is a box-shaped member made of a steel plate having a thickness of 1 mm, and has a width of 25 mm.
(That is, this is the thickness of the side wall).

The plate-shaped laminated body (sound absorbing material) 34 shown in FIG. 1C is cut and processed and fixed so as to close the upper surface (open surface) of the housing 31, and then, as shown in FIG. The plate-shaped membrane vibration sound absorbing panel 35 (soundproof wall member) shown was produced.

Regarding the plate-shaped film vibration sound absorbing panel 35,
The result of measuring the reverberation room sound absorption coefficient according to JIS A1409-1967 is shown in FIG.
Shown in. As is clear from this figure, a high sound absorption coefficient of 0.7 or more at 400 Hz and 0.8 or more at 1000 Hz is obtained.

FIG. 3B shows a front view of the translucent soundproof wall 30 in which the plate-shaped film vibration sound absorbing panel 35 is incorporated. The plate-shaped membrane vibration-absorbing panel 35 is provided with an H-shaped steel support 36 which is erected from an H-shaped steel foundation 37.
It was installed with the method of dropping in between.

[Embodiment 2] <Waveform vibration absorbing panel soundproof wall > As shown in FIG. 4 (a), 2000 m (length) × 500
A housing 41 having a size of mm (width) × 95 mm (depth) and having only the upper surface opened was manufactured. The bottom surface of the housing 41 is a transparent resin sound insulating plate 42 having a thickness of 5 mm, and the side wall 43 is a box-shaped plate made of a steel plate having a thickness of 1 mm.
(That is, this is the thickness of the side wall).

The plate-shaped laminated body (sound absorbing material) shown in FIG. 1C is cut so as to close the upper surface (open surface) of the housing 41, and the corrugated membrane vibration sound absorbing body 44 processed into a corrugated shape is fixed. Then, the corrugated film vibration absorption panel (soundproof wall member) 4 shown in FIG.
I made 5.

The wave pitch (distance from one crest to the next crest) of the corrugated membrane vibration absorber 44 was 325 mm. Also,
The air layer (distance from the bottom of the case) of the mountain part is 95mm,
The air layer in the valley was 50 mm. Therefore, the wave amplitude was set to 45 mm.

Regarding this corrugated membrane vibration absorbing panel 45,
The result of measuring the reverberation room sound absorption coefficient according to JIS A1409-1967 is shown in FIG.
Shown in. As is clear from this figure, a high sound absorption coefficient of 0.7 or more at 400 Hz and 0.8 or more at 1000 Hz is obtained.

FIG. 4B shows this corrugated film vibration absorbing panel.
The front view of the translucent sound-insulating wall 40 in which the (sound-proof wall member) is incorporated is shown. The corrugated membrane vibration sound absorbing panel was installed by a method in which columns H made of H type steel were erected from a foundation 47 made of H type steel and dropped between the columns 46 made of H type steel.

Example 3 <Cylindrical Membrane Vibration Absorption Panel Soundproof Wall > As shown in FIG. 5B, 2000 mm (length) × 10
A housing 51 having a size of 00 mm (width) × 95 mm (depth) and having an open top surface was manufactured. The bottom surface of the housing 51 is a transparent resin sound insulating plate 52 having a thickness of 5 mm, and the side wall 53 is a box-shaped member made of a steel plate having a thickness of 1 mm.
mm (that is, this is the thickness of the side wall).

A plate-like laminated body (sound absorbing material) shown in FIG. 1C is cut on the open side of the housing 51 to have an outer diameter of 95 mm and a length as shown in FIG. 5A. A cylindrical membrane vibration absorber 54 of 930 mm was manufactured. This cylindrical membrane vibration absorber 5
4 was mounted in the housing 51 as shown in FIG. The mounting interval (space between cylinders) of the cylindrical membrane vibration absorber 54 was 62 mm. From the viewpoint of transparency, it is preferable that the mounting intervals of the cylinders are large, but if the intervals become too large, the sound absorption coefficient decreases, so
It is preferably within the outer diameter of the cylinder.

The mounting direction of the cylindrical membrane vibration absorbing body 54 is not limited to the vertical direction, and may be installed in the horizontal direction or at an arbitrary angle.

With respect to this cylindrical membrane vibration sound absorbing panel 55, the result of measuring the reverberation room sound absorbing coefficient according to JIS A1409-1967 is shown in FIG. 10 together with the results of other panels.
In c. As is clear from this figure, even when the mounting distance of the cylindrical membrane vibration absorber 54 is 62 mm, it is 0.7 or more at 400 Hz, and 100
A high sound absorption coefficient of 0.8 or more is obtained at 0 Hz.

Transparency is further improved through this interval. In particular, the view from the inside of a car running at high speed is greatly improved through this interval.

FIG. 5C shows a front view of the translucent soundproof wall 50 in which the cylindrical membrane vibration absorbing panel 55 is incorporated. In the cylindrical membrane vibration sound absorbing panel, an H-shaped steel column 56 is erected from an H-shaped steel foundation 57, and the H-shaped steel column 56 is formed.
It was installed with the method of dropping in between.

[Embodiment 4] <Translucent Soundproof Wall Top Silencer > A perspective view of a translucent soundproof wall top silencer 60 is shown in FIG.
The same film vibration absorbing material as the laminate (sound absorbing material) used in Example 1 was processed to form a cylindrical film vibration absorbing body 64 having an outer diameter of 500 mm and a length of 1000 mm.

On both the outer circumference and inner circumference of the cylindrical membrane vibration absorber 64, a plate made of aluminum having a plate thickness of 1.5 mm and a width of 20 mm is processed into a ring shape.
The cylindrical membrane vibration sound absorber 64 was sandwiched between 5 to reinforce. Two rings 6 sandwiching the cylindrical membrane vibration absorber 64
5 were fixed to each other with screws.

Further, the transparent sound insulating plate 6 for the sound deadening device at the top of the soundproof wall
3 is a vertical plate 6 having a height of 498 mm and a length of 1000 mm, which is formed by cutting and adhering a transparent resin flat plate having a thickness of 5 mm.
1 and a horizontal plate 62 having a width of 498 mm and a length of 1000 mm were formed into a cross shape.

This transparent sound insulating plate 63 for the sound deadening device at the top of the soundproof wall
Was inserted into the cylindrical membrane vibration absorbing body 64 and screwed to the sound insulation plate fixing metal fitting 66 attached to the inside of the ring 65 to manufacture the translucent soundproof wall top silencer 60.

FIG. 8 (a) is a front view of the translucent soundproof wall top silencer 60 provided on the corrugated membrane vibration absorbing panel soundproof wall 81, and FIG. 8 (b) is a sectional view taken along line bb. ).
The shape of the soundproof wall top silencer 63 for insertion into the translucent soundproof wall top silencer 60 is not limited to a cross shape, and may be V -shaped or US-shaped. I don't care.

[Embodiment 5 ] A field test was conducted in order to confirm the effect of a soundproof wall having a membrane vibration absorber installed on the sound source side and a translucent soundproof wall top silencer installed at the top of the soundproof wall. .

FIG. 11 shows the outline of the field test. A pair of soundproof walls 111 having a height of 3.3 m were installed with a length of 30 m and a space of 15 m. 0.
The speaker 112 was installed at a height of 5 m. Also,
Two points (P-1 / P-2) having a height of 1.2 m at positions of 5 m and 10 m from the soundproof wall were set as measurement points 113, and a microphone 114 was installed here.

500 Hz, 1000 Hz, 2000 Hz
1/1 octave band noise was generated and these were used as test sound sources. The strength of the test sound source was adjusted to be 100 dB at 1 m in front of the speaker. First,
As Comparative Example P, the sound insulation effect of a resin sound insulation wall having a height of 3.3 m and a thickness of 5 mm was confirmed.

Next, as Example W, the corrugated membrane vibration absorption panel (soundproof wall member) 45 of FIG. 4 (a) is stacked in six layers, and the corrugated membrane vibration absorption panel soundproof wall 70 having a height of 3.3 m is used.
The sound reduction effect was confirmed using.

FIG. 7A shows a front view of a corrugated membrane vibration absorption panel soundproof wall 70 in which the corrugated sound absorption panel 45 has six layers. Further, (b) shows a sectional view taken along the line aa.

The noise reduction effect is measured at each measurement point (P-1 / P
-2) Obtained by subtracting the sound pressure level (dB) of the example W from the sound pressure level (dB) of the comparative example P in 113,
These are summarized in Table 1.

[0083]

[Table 1]

In order to confirm the effect of the translucent soundproof wall top silencer 60, the corrugated membrane vibration absorbing panel soundproof wall of the embodiment W is in a state where the uppermost panel is pulled out, that is, the panels are stacked in five stages. In this state, a translucent soundproof wall top muffling device 60 is disposed on the uppermost step of the soundproof wall, and this is used as an embodiment R.
And

FIG. 8A shows a waveform sound absorbing panel (soundproof wall portion).
Material] A front view of a state in which a translucent top silencer 60 is arranged on the top of a soundproof wall 81 in a state where five layers of 45 are stacked.
Further, (b) shows a cross-sectional view taken along the line bb.

The effect of the translucent top silencer 60 is also the same.
Corrugated membrane vibration absorption panel from the sound pressure level (dB) obtained by the soundproof wall 70 (referred to as Comparative Example W)
The sound pressure level of the embodiment R in which the translucent top silencer 60 is arranged on the top of the soundproof wall 81 in which the (soundproof wall members) are stacked in five layers.
It was calculated by subtracting (dB), and the results are summarized in Table 2.

[0087]

[Table 2]

As is clear from Table 1, at the measurement point P-1, the noise reduction effect of the corrugated membrane vibration absorption panel soundproof wall 70 is 1 to 2 dB, and from Table 2, the effect of the translucent top silencer 60 is shown. Is 2 to 9 dB, and therefore 3 to 11 d due to the combined effect.
The noise reduction effect of B is obtained.

[Embodiment 6 ] The translucent soundproof wall 80 (FIG. 8) used in Embodiment R of Embodiment 5 is used, and, as shown in FIG. 9, the middle portion of the uppermost corrugated sound absorbing panel is used. Therefore, an inclined translucent branch wall 91 made of a transparent resin plate is provided on the side opposite to the sound source side.

The thickness of the resin plate was 5 mm, and the translucent branch wall 91 was attached with screws to an attachment base 92 welded to an H-shaped steel column. The angle formed by the translucent branch wall 91 and the soundproof wall was 45 degrees. Further, the apex of the translucent branch wall 91 is at the same height as the apex of the translucent soundproof wall top silencer 60.

The field test is carried out according to the fifth embodiment.
It was the same as the procedure carried out in. The comparative example is similar to the example R of the example 6, that is, a case using the translucent soundproof wall 80 shown in FIG.

In addition, an example of the transparent soundproof wall 90 with the transparent branch wall in Comparative Example R was designated as Example D, and the measurement point (P
Table 3 shows the results of determining the sound pressure level difference (dB) between Comparative Example R and Example D in (1 / P-2) 113.

[0093]

[Table 3]

The effects of the present invention are clear from the above field test results.

Example 7 <Sidewall-Lined Membrane Vibration Absorption Panel Soundproof Wall of Sidewall > As shown in FIG. 12 (a), 1910 mm (length) × 93
A housing 101 having a size of 0 mm (width) × 95 mm (depth) and having an open top surface was manufactured. Further, an intermediate partition plate 102 made of steel plate is provided at the center of the housing 101 in the length direction. Figure 12
A cross-sectional view taken along line dd is shown in (b).

The purpose of installing the intermediate partition plate 102 is that when the size of the plate-shaped membrane vibration absorber 103 becomes large as in the case of the present embodiment, there is a possibility that bending will occur in the central portion of the panel due to wind pressure. This is to prevent it.

The bottom surface of the casing 101 has a thickness of 5 m.
m is a transparent resin sound insulation plate 104, and the side wall 105 has a thickness of 1
25 mm wide, which is made into a box shape using a steel plate of mm
(That is, this is the thickness of the side wall).

Inside the side wall 105 of the casing 101, an open-cell type elastic foam sound absorbing material 106 having a thickness of 25 mm and a height of 95 mm is placed, and an ethylene fluoride thin film 1 having a thickness of 21 μm.
The product wrapped in 07 was lined.

A plate-like laminate (sound absorbing material) 34 shown in FIG. 1C is formed so as to close the upper surface (open surface) of the casing 101.
Was fixed by cutting and processing, and as shown in FIG. 12 (b), the plate-shaped membrane vibration-absorbing body 103 was attached, and the side wall-lined plate-shaped membrane vibration-absorbing panel 108 was manufactured.

[0100] This side wall-lined plate-shaped film vibration absorption panel (
Sound wall member) 108, JISA 1409-196
FIG. 13 shows the results of measuring the reverberation room sound absorption coefficient according to No. 7, together with the results of measuring the reverberation room sound absorption coefficient of the panel without the lining. As is clear from this figure, in the case of the e curve of FIG. 13 lined with the open-cell elastic foam sound absorbing material 106, the sound absorption coefficient in the entire frequency band is higher than that of the comparative example without the lining shown in the d curve of FIG. Is clearly improved.

[0101]

As described above in detail, by using the soundproof wall according to the present invention, it is possible to provide a translucent soundproof wall with visibility. Further, by using the translucent membrane vibration sound absorber and the sound insulating plate as the constituent materials of the soundproof wall top muffling device, it is possible to provide the soundproof wall top muffling device.

Further, by disposing the branch wall beside the top silencer on the side opposite to the sound source side, a further noise reduction effect can be obtained.

By using the soundproof wall, the soundproof wall muffler at the top of the soundproof wall, and the branch wall of the present invention in an elevated expressway or a railway, noise can be reduced while mitigating the problem of sunshine on the road or private houses on both sides of the railway.

Since the visibility through the soundproof wall can be secured, the view from the inside of the vehicle is also possible.

[Brief description of drawings]

FIG. 1A, FIG. 1B, FIG. 1C and FIG. 1D are conceptual diagrams for explaining a layer structure of a membrane vibration absorber.

2 (a), (b), and (c) are conceptual diagrams for explaining a sound absorbing action of a membrane vibration absorber.

FIG. 3A is a perspective view of a plate-shaped membrane vibration-absorbing panel. (B) is a front view of the translucent sound-insulating wall in which the plate-shaped film vibration-absorbing panel is incorporated.

FIG. 4A is a perspective view of a corrugated membrane vibration absorption panel. (B) is a front view of the translucent sound insulation wall in which the corrugated membrane vibration absorption panel is incorporated.

FIG. 5A is a perspective view of a cylindrical sound absorbing body.
(B) is a front perspective view of a cylindrical membrane vibration absorption panel.
(C) is a front view of the translucent sound-insulating wall in which the cylindrical membrane vibration-absorbing panel is incorporated.

FIG. 6 is a perspective view of a translucent soundproof wall top silencer.

FIG. 7 (a) is a front view of a soundproof wall of a corrugated membrane vibration absorbing panel. (B) is an aa line sectional view.

FIG. 8 (a) is a front view showing a state in which a translucent soundproof wall top silencer is provided on the top of the corrugated membrane vibration absorbing panel soundproof wall. (B) is a bb line sectional view.

FIG. 9 (a) is a front view showing a state in which a translucent soundproof wall top silencer is provided on the top of a corrugated film vibration sound absorbing panel soundproof wall, and further a branch wall is provided. (B) is a cc line sectional view.

FIG. 10 is a diagram showing a measurement result of a sound absorption coefficient by a reverberation room method of a membrane vibration sound absorbing panel.

FIG. 11 is a diagram illustrating an implementation point of a field test.

FIG. 12 (a) is a perspective view of an open-cell type elastic foam lined plate-like membrane vibration-absorption panel. (B) is a dd line sectional view.

FIG. 13 is a diagram showing measurement results of reverberation chamber sound absorption coefficients of a plate-shaped film vibration sound absorbing panel (d) and an open-cell elastic foam sound absorbing material lined plate-shaped film vibration sound absorbing panel (e).

[Explanation of symbols]

12 plate-like body 14 (having a large number of openings) resin thin film 30 plate-like film vibration absorbing panel soundproof wall 31, 41, 51, 101 housing 32, 42, 52, 104 transparent resin sound-insulating plate 33, 43, 53 , 105 Side wall 34 Plate-shaped laminated body (sound absorbing material) 40, 70, 81 Waveform film vibration absorbing panel soundproof wall 44 Waveform film vibration absorbing body 54, 64 Cylindrical film vibration absorbing body 35 Plate film vibration absorbing panel (soundproof wall member) ) 45 Corrugated Membrane Vibration Sound Absorption Panel (Soundproof Wall Member) 50 Cylindrical Membrane Vibration Sound Absorption Panel Soundproof Wall 55 Cylindrical Membrane Vibration Sound Absorption Panel (Soundproof Wall Member) 108 Continuous Cell Type Elastic Foam Lined Plate Membrane Vibration Sound Absorption Panel 36, 46, 56,86,96 H-type steel strut 37,47,57,77,87,97 H-type steel foundation 60 light-transmissive soundproof Kabeitadaki part muffler 61 vertical plate 62 the horizontal plate 63 soundproof Kabeitadaki unit transparent for silencers Shaped sound insulating plate 65 ring 66 sound insulating plate fixing bracket 67 cylindrical membrane vibration sound absorbing body attaching plate 80 light-transmissive sound barrier 90 light-transmissive branch wall with light-transmissive sound barrier 91 light-transmissive branch wall 92 mounting platform 102 intermediate partition Plate 103 Plate-shaped Membrane Vibration Absorber 106 Open Cell Type Elastic Foam Sound Absorber 107 Ethylene Fluoride Thin Film 108 Sidewall Lined Membrane Vibration Absorption Panel (Soundproof Wall Member) 111 Soundproof Wall 112 Speaker 113 Measurement Point 114 Microphone

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI G10K 11/16 G10K 11/16 D (72) Inventor Shichirou Koike 2-2-2 Jonanjima, Ota-ku, Tokyo Within Unix Co., Ltd. (72) Inventor Kenji Ihara 2-2, Jonanjima, Ota-ku, Tokyo Within Unix Co., Ltd. (56) References JP-A-10-222170 (JP, A) JP-A-9-264006 (JP, A) ) Actually open 50-6909 (JP, U) Actually open 1-138909 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E01F 8/00 B32B 3/12 E04B 1 / 82 E04B 1/86 G10K 11/16

Claims (3)

(57) [Claims] 1. A cylindrical side wall of a plate-shaped transparent membrane vibration-absorbing material, which is formed by laminating at least one plate-shaped body having a large number of openings and at least one transparent resin thin film, Inside the cylinder, cut and glue a transparent resin plate,
Noise reduction at the top of a soundproof wall with vertical and horizontal plates formed into a cross
A translucent soundproof wall top muffling device, characterized in that a transparent sound insulating plate for the device is inserted. 2. A plate-shaped transparent membrane vibration-absorbing material, which is formed by laminating at least one plate-shaped body having a large number of openings and at least one transparent resin thin film, or of the membrane vibration-absorbing material. The soundproof wall is formed by arranging the molded product on the sound source side of the housing, and stacking a soundproof wall member having a transparent resin sound insulating plate on the surface opposite to the sound source of the housing to form a soundproof wall. A translucent soundproof wall, wherein the translucent soundproof wall top silencing device according to claim 1 is arranged on the top of the staircase. 3. A transparent resin plate is provided adjacent to a sound-deadening wall top silencer only on the side opposite to the sound source, and the top is inclined upward on the side opposite to the sound source, and its apex is transparent. Type soundproofing
The translucent soundproof wall according to claim 2, further comprising a translucent branch wall having the same height as the apex of the muffler on the top of the wall.