JP2011094400A - Metal sound-insulation panel having double wall structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal sound-insulation panel comprising a sound insulation wall insulating noise of vehicles travelling on a road or a railway, or noise of machinery, hit sound, etc. made in a factory. <P>SOLUTION: An upper face plate and a lower face plate are formed on an upper and lower parts of a rear plate in a manner of forming a substantially U-letter shape in vertical cross section, and a porous front plate having a number of pores is joined to a front side of the upper face plate and the lower face plate to form an outer shell casing. Openings on both sides of the outer shell casing are closed up by side plates. An inner partition plate formed of a non-porous metal plate bent into a shape of a folding screen or of a chevron is arranged inside the outer shell casing. The upper part of the inner partition plate is joined to the upper face plate, and the lower part of the inner partition plate is joined to the lower face plate. A sound-absorbing material is arranged between the porous front plate and the inner partition plate to form a first wall structure. The space between the inner partition plate and the rear plate is filled with the sound absorbing material without forming a gap to form a second wall structure. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention belongs to the technical field of a metal sound insulation panel that constitutes a sound insulation wall that cuts off noise such as noise generated by vehicles traveling on roads and railways, or mechanical noise and impact sound generated in a factory. The interior is equipped with a non-porous partition plate that exhibits sound insulation performance, sound-absorbing materials are arranged on both sides of the partition plate, the front is formed of a porous front plate, and the back is a non-porous back plate It is related with the sound insulation panel which is excellent in the sound absorption performance and the sound insulation performance.

Conventionally, as a sound insulation panel used for a sound insulation wall that blocks noise generated by vehicles traveling on roads and railways, noise from a specific direction or place, such as machine noise and impact sound of a factory, the weight of a concrete board has hitherto been Large sound insulation panels or lightweight metal sound insulation panels are known and used.
The sound insulation panel made of metal is easy to manufacture, suitable for mass production, is light in weight, and is easy to handle such as road transportation and storage, and has a feature that it is easy to construct a sound insulation wall on site. Therefore, further improvement and development of a metal sound insulation panel having both high sound insulation performance and sound absorption performance are expected.

In the “sound insulation panel” disclosed in Patent Document 1 below, two panel members disposed on the front side and the back side are each composed of a non-porous surface plate and a sound absorbing material provided on the inner surface thereof. . The sound-absorbing material is made of an amorphous sound-absorbing material such as glass wool covered with a protective sheet, and the panel member on the side is provided with a metal plate such as an iron plate on the inner side surface of the sound-absorbing material, and the two panel members are provided with the metal plate. It is set as the arrangement | positioning which opened the space | interval on both sides, and the said space | interval part is formed in the air layer. In this sound insulation panel, the surface plates of the two panel members are non-porous plates and can be said to have a double wall structure, but the sound absorbing performance is not taken into consideration.
Next, as a prior art regarding a metal sound-absorbing panel, for example, the “structure of a soundproof plate” disclosed in Patent Document 2 below is known and well known. This is done by placing a porous plate on the front side facing the sound source, placing a porous material (so-called sound absorbing material) made of fibrous felt such as asbestos or glass wool behind it, and forming a thin metal plate behind it. A corrugated perforated plate obtained by forming a perforated plate with a large number of holes into an arc shape is disposed to support the porous material (sound absorbing material) and to form an air layer. Then, behind the corrugated perforated plate, a heavy plate excellent in sound insulation such as an inorganic or organic slate plate or a living board is disposed so as to be in contact with the corrugated perforated plate. Therefore, considering the sound insulation performance, it cannot be denied that the sound insulation performance is low because of the single wall structure.
Incidentally, the “structure of the soundproof plate” disclosed in the following Patent Document 3 is known and well known as a conventional example of a “sound absorbing panel”. This is because both sides of a non-perforated corrugated heavy plate (partition plate) made of a heavy plate (sound insulating plate) excellent in sound insulation such as an inorganic or organic slate plate or living board in a circular arc shape are thin. An air layer is formed as an arrangement sandwiched between two perforated plates with a large number of holes in a metal plate, and the outer surface of the two perforated plates is porous by a fibrous felt-like material such as asbestos or glass wool. A material (so-called sound absorbing material) is arranged, and the outer surface of the porous material is covered with a porous plate such as a cross cover, a synthetic resin plate, or a metal plate. This sound absorbing panel is configured such that both the front and back surfaces absorb noise from the sound source, and the sound insulation performance is not considered.

JP 2008-291557 A Japanese Utility Model Publication No. 52-34015 Japanese Utility Model Publication No. 52-34016

The sound insulation performance (acoustic transmission loss R) of a plate (iron plate, concrete plate, synthetic resin plate, etc.) made of a single material is determined by a mass rule represented by the following [Equation 1].
[Equation 1]
R = R0-10Log (0.23 × R0) (dB)
R0 = 20 Log (fm) -42.5 (dB)
Where R: Random incident sound transmission loss
R0: Sound transmission loss at normal incidence
f: Frequency (Hz)
m: Areal density of material (Kg / m ² )
According to the above [Equation 1] and FIG. 7 showing the calculated value, it is understood that the sound insulation performance (sound transmission loss dB) is improved by about 5 dB each time the plate mass is doubled. For example, a sound insulation performance (sound transmission loss) of a plate having a weight of 10 kg per m ² is about 23 dB, and a sound insulation performance (sound transmission loss) of a plate having a weight of 20 kg per m ² is about 28 dB, and the weight per m ² is 40 kg. The sound insulation performance (sound transmission loss) of the plate is about 32 dB, and although the improvement in the sound insulation performance is slow, the weight of the plate increases several times. Therefore, in the case of a plate made of a single material, when the weight exceeds a certain level, it is clear that even if the plate thickness is increased and the weight is increased, the sound insulation performance (sound transmission loss) is hardly improved ( (See FIG. 7). Therefore, when trying to obtain a desired sound insulation performance (sound transmission loss), the weight of the plate becomes very large.

  Therefore, as a means for improving the sound insulation performance without depending only on the weight, a technical idea of a double wall structure in which two plate materials are doubled has been developed (for example, FIG. 6 to FIG. 10 and its description). The sound insulation performance of the double wall structure is likely to be the sum of the sound transmission loss of each plate. However, the acoustic transmission loss is actually lower than the value calculated by the mass law because of the resonance phenomenon of the two plate materials and structurally a part of the two plate materials combined by the base material. It is also known that there may be cases.

  From the above viewpoint, when trying to verify the “soundproof plate structure” disclosed in Patent Document 2 described above, a thin metal plate is placed behind the porous material (sound absorbing material) in contact with the front porous plate facing the sound source. Since the corrugated perforated plate with a large number of holes is arranged to form a so-called air layer, the noise that passes through the front perforated plate and reaches the subsequent porous material (sound absorbing material) It is absorbed and attenuated accordingly by the sound absorption performance of the material. However, the noise that could not be absorbed by the porous material (sound absorbing material) reaches the air layer formed by the corrugated porous plate and is further attenuated, but the remaining sound passes through the corrugated porous plate and passes through the back side. Since it reaches one heavy plate, it must rely on the performance of sound insulation with this heavy plate. However, it is apparent from the above-mentioned reason that high sound insulation performance cannot be expected for one heavy plate. In addition, a configuration for blocking the phenomenon in which the corrugated porous plate and the heavy plate on the back side resonate and resonate and emit sound to the back side cannot be recognized.

In that respect, in the case of the “sound insulation panel” disclosed in Patent Document 1 described above, the combination of the non-porous surface plates constituting the front and rear two panel members constitutes a so-called double wall structure. It is considered that the sound insulation performance is higher than the “soundproof plate structure” disclosed in Patent Document 2. However, this “sound insulation panel” has a drawback that it cannot be expected from the so-called sound absorption performance because both the front surface and the back surface are made of non-porous surface plates. That is, when a sound insulation wall is constructed using this “sound insulation panel”, it is predicted that the noise reflected randomly by the non-porous surface plate will be scattered and spread to the surroundings as a so-called reverberant sound. The
Further, when a partition wall is provided to form a double wall structure, as described in FIG. 7 of Patent Document 1 due to the resonance of the air layer, a sudden decrease in performance in a specific sound range can be considered. A structure that prevents resonance is required.
And, in the case of the “soundproof plate” disclosed in the above-mentioned Patent Document 3, even if the sound absorption performance is exhibited, since it is not a double wall structure, the sound insulation performance exceeding the mass law cannot be expected and the sound absorption is not possible. I can't wipe out the concerns about noise going through.

  Accordingly, an object of the present invention is to provide a metal sound insulation panel having a more rational double wall structure and having both high sound insulation performance and sound absorption performance.

As means for solving the above problems, a metal sound insulation panel 1 having a double wall structure according to the invention described in claim 1 is:
An upper surface plate portion 9 and a lower surface plate portion 10 are formed on the upper and lower sides of the back plate 8 so that the vertical cross section is substantially U-shaped, and a plurality of holes are provided on the front surface side of the upper surface plate portion 9 and the lower surface plate portion 10. A porous front plate 5 is joined to form an outer shell casing, and openings on both sides of the outer shell casing are closed with side plates 12,
An inner partition plate 6 formed by bending a non-porous metal plate into a folding screen type or a mountain shape is provided inside the outer shell casing, and the upper portion of the inner partition plate 6 includes the upper surface plate portion 9 and the inner partition plate. The lower part of 6 is joined to the lower surface plate part 10,
A sound absorbing material 71 is arranged between the porous front plate 5 and the partition plate 6 to form a first wall structure, and the sound absorbing material 72 is also filled between the partition plate 6 and the back plate 8 without any gap. And a second wall structure is formed.

The invention described in claim 2 is a metal sound insulation panel having a double wall structure described in claim 1,
The sound absorbing material 71 arranged between the porous front plate 5 and the partition plate 6 has a high density structure, and the sound absorbing material 72 filled without a gap between the partition plate 6 and the back plate 8 has a low density. It is the structure.
The invention described in claim 3 is a metal sound insulation panel having a double wall structure according to claim 1 or 2,
The sound absorbing material 71 disposed between the porous front plate 5 and the partition plate 6 has a high density configuration of 25 kg / m ³ or more and 50 kg / m ³ or less, and a gap is provided between the partition plate 6 and the back plate 8. The sound-absorbing material 72 that is completely filled has a low-density configuration of 5 kg / m ³ or more and less than 25 kg / m ³ .

The invention described in claim 4 is a metal sound insulation panel having a double wall structure according to any one of claims 1 to 3,
The thickness of the middle partition plate 6 is a heavy plate configuration that is thicker than the thickness of the back plate 8.
The invention described in claim 5 is a metal sound-insulating panel having a double wall structure according to any one of claims 1 to 4,
The partition plate 6 formed by bending a non-porous metal plate into a folding screen type or mountain shape is characterized by being formed in a single V-shape or two M-shapes.

The invention described in claim 6 is a metal sound insulation panel having the double wall structure described in claims 1 to 5,
The middle partition plate 6 has bent sides 6a and 6b formed at both ends in the bending direction, and is joined with the outer casing facing the seal plate 13 and the seal material 13 therebetween. The end edges on both sides orthogonal to each other are characterized by being joined with the side plate 12 facing each other with the sealing material 14 interposed therebetween.
The invention described in claim 7 is the metal sound-insulating panel having the double wall structure described in claim 6,
The sealing materials 13 and 14 are characterized by being foamable rubber or viscoelastic rubber.

The metal sound-insulating panel having a double wall structure according to the invention described in claims 1 to 7 is formed with a porous front plate 5 on the front surface facing the sound source while maintaining the characteristic of being lightweight. 5 and a partition wall 6 formed by bending a non-porous metal plate into a folding screen shape or a mountain shape to form a first wall structure, and thus entered through the porous front plate 5. Noise can be expected to be absorbed by the sound absorbing material 71.
On the other hand, since the second wall structure is formed by filling the sound absorbing material 72 between the partition plate 6 and the back plate 8 without any gap, the resonance of the partition plate 6 is suppressed and the sound insulation performance by resonance transmission is achieved. Therefore, high sound insulation performance can be expected.
In particular, the sound absorbing material 71 disposed inside the porous front plate 5 is effectively supported so as not to move by the partition plate 6 bent in a folding screen shape or a mountain shape, but the sound absorbing material 71 has a high density. Since it has a highly shaped configuration, specifically a high-density configuration of 25 kg / m ³ or more and 50 kg / m ³ or less, the air layer 15 is surely provided behind the sound absorbing material 71 according to the bent shape of the partition plate 6. It is formed. Therefore, the noise that enters from the porous front plate 5 and passes through the sound absorbing material 71 to reach the partition plate 6 is scattered by the partition plate 6 bent in a folding screen type or a mountain shape in the middle and low sound range. The effect of improving the sound absorption performance and the sound insulation performance is exhibited (see the actual measurement value in FIG. 6 = the diagram marked with ■). The solid line in FIG. 6 is the percentage of the actual measurement value in the example of the present invention when the transmission loss of the panel surface density (calculated value based on the law of mass) is 100%. It can be confirmed that there is a particular improvement.

On the other hand, the sound-absorbing material 72 filled between the partition plate 6 and the back plate 8 has a low density configuration, specifically a configuration of 5 kg / m ³ or more and less than 25 kg / m ³ and an atypical configuration. When filling along the back surface of the partition plate 6 bent into a mountain shape, the work of filling the space between the partition plate 6 and the back plate 8 without any gap is easy. In addition, since the inner partition plate 6 and the back plate 8 are supported in close contact with each other, the resonance of the inner partition plate 6 is suppressed, and a decrease in sound insulation performance due to resonance transmission can be prevented.
In addition, the bent sides 6a and 6b of the partition plate 6 and the outer casing or side plate 12 are joined with the seal member 13 interposed therebetween, and are orthogonal to the bending direction of the partition plate 6. Since the end edges on both sides are joined with the side plate 12 or the outer shell casing with the sealing material 14 interposed therebetween, the propagation of noise and vibration transmitted from the partition plate 6 to the back plate 8 is cut off. It prevents the sound insulation performance from deteriorating.
Further, as in the invention described in claim 4, when the thickness of the partition plate 6 is made of a heavy plate that is thicker than the thickness of the back plate 8, the surface density of both plates is made different, and the sound insulation performance due to resonance. In addition, the plate material area of the partition plate 6 is smaller than the total plate material area of the back plate 8 and the upper surface plate portion 9 and the lower surface plate portion 10 integrally connected to the upper and lower sides thereof, On the contrary, the effect of reducing the weight of the metal sound insulation panel can be obtained while exhibiting the same sound insulation performance and sound absorption performance as compared with the case where the thickness of the back plate 8 or the like is increased.
By constructing and implementing a metallic sound insulation panel having a double wall structure as described above, particularly high sound insulation performance can be obtained in the mid-low range.

It is the perspective view which showed an example of the sound insulation wall constructed | assembled using the metal sound insulation panel by this invention. It is the front view which showed the front surface of the metal sound-insulation panel by this invention. FIG. 3 is an enlarged cross-sectional view taken along the line C-C indicated in FIG. 2. 4A is an enlarged view of the portion A designated in FIG. 3, and FIG. 4B is an enlarged view of the portion B designated in the same FIG. FIG. 3 is an enlarged cross-sectional view taken along line DD indicated in FIG. 2. It is a performance diagram which showed the actual measurement value of the sound insulation performance of the metal sound insulation panel by this invention. It is the graph which showed the example of calculation of sound transmission loss.

The metal sound-insulating panel having a double wall structure according to the present invention has an upper surface plate portion 9 and a lower surface plate portion 10 formed on the upper and lower sides of the back plate 8 so that the vertical cross section is substantially U-shaped. An outer shell casing is formed by joining a porous front plate 5 provided with a large number of holes on the front side of the lower plate portion 10, and an opening on both sides of the outer casing is closed with side plates 12. An inner partition plate 6 formed by bending a non-porous metal plate into a folding screen type or a mountain shape is installed inside the casing. The upper portion of the inner partition plate 6 is the upper surface plate portion 9 and the lower portion is the lower surface plate portion. 10 is joined.
A sound absorbing material 71 is arranged between the porous front plate 5 and the partition plate 6 to form a first wall structure, and the sound absorbing material 72 is filled between the partition plate 6 and the back plate 8 without any gaps. Thus, the second wall structure is formed.
The sound absorbing material 71 disposed between the porous front plate 5 and the partition plate 6 has a high density configuration, specifically, a high density configuration of 25 kg / m ³ or more and 50 kg / m ³ or less. The sound absorbing material 72 filled between the back plates 8 without a gap has a low density configuration, specifically, a low density configuration of 5 kg / m ³ or more and less than 25 kg / m ³ .

The plate thickness of the partition plate 6 is a heavy plate configuration that is thicker than the plate thickness of the back plate 8.
The partition plate 6 formed by bending a non-porous metal plate into a folding screen type or a mountain shape is formed in a single V-shape or two M-shapes.
Bending sides 6 a and 6 b formed at both ends in the bending direction of the middle partition plate 6 are joined with the outer casing or side plate 12 facing each other and the sealing material 13 between them, and are bent at the middle partition plate 6. The end edges on both sides orthogonal to the direction are joined to the side plate 12 or the outer casing facing each other with the sealing material 14 sandwiched therebetween.
The sealing materials 13 and 14 are foamed rubber or viscoelastic rubber.

In the following, the present invention will be described based on illustrated embodiments.
FIG. 1 shows an example of a sound insulation wall constructed using a metal sound insulation panel 1 having a double wall structure according to the present invention. This sound insulation wall is formed in the horizontal direction of the metal sound insulation panel 1 on the concrete foundation 2 constructed in a substantially horizontal projection shape with concrete or the like along the longitudinal direction of the road or railway or on the ground on the outer periphery of the factory site. The pillars 3 and 3 made of H-shaped steel or the like are vertically built at intervals substantially equal to the length of the metal, and a plurality of metal sound insulation panels 1 are built in multiple stages between them using the vertical grooves of the two adjacent pillars 3 and 3. The sound insulation wall of the required height is constructed by piled up. Reference numeral 4 in FIG. 1 is a headboard installed as a finish of the upper end of the sound insulation wall.

FIG. 2 shows a front surface (side toward the sound source) of the metal sound insulation panel 1 having the double wall structure. Incidentally, when showing an example of the size of the metal sound insulation panel 1, the horizontal dimension in FIG. 2 is about 2000 mm, the vertical dimension is about 500 mm, and the panel thickness as viewed in the direction of FIG. The dimension is about 140 mm.
The left side of FIG. 3 showing the cross section taken along the line C-C in FIG. 2 is the panel front facing the noise source. For example, the front surface is a porous sheet in which a large number of long holes 5a in the horizontal direction having a width of about 15 mm and a length of about 40 mm are provided in a regular matrix in the vertical and horizontal directions on almost the entire surface of a highly weather-resistant plated steel sheet. It is shielded by a porous front plate 5 made of a plate (punching metal). However, the shape of the hole 5a of the porous front plate 5 is not limited to the long hole, and may be a round hole, a square hole, a triangular hole, or the like.

An upper surface plate portion 9 and a lower surface plate portion 10 are formed on the upper and lower sides of the back plate 8 located on the right side of FIG. 3 so that the longitudinal section viewed in the direction of FIG. 9 and the front surface side of the lower surface plate portion 10 (left side in FIG. 3) are joined to the perforated front plate 5 provided with a large number of holes to form an outer shell casing. In this outer shell casing, an outer shell casing having a structure in which the openings on both sides, that is, the opening in the left-right direction in FIG.
As shown in FIG. 3, an inner partition plate 6 in which a non-porous metal plate is bent in a folding screen type or a mountain shape is disposed in a substantially central position inside the outer shell casing having the above-described configuration. The upper portion is fixed to the upper surface plate portion 9 and the lower portion is fixed to the lower surface plate portion 10.
A sound absorbing material 71 is disposed between the porous front plate 5 and the partition plate 6 to form a first wall structure, and a sound absorbing material 72 is also provided between the partition plate 6 and the back plate 8. The second wall structure is formed by filling without gaps.

The sound absorbing material 71 disposed between the porous front plate 5 and the partition plate 6 described above has a high density configuration, specifically, the sound absorbing material 71 has a high density of 25 kg / m ³ or more and 50 kg / m ³ or less. As a configuration, the sound absorption performance of the first wall structure is enhanced. That is, when the noise passes through the porous front plate 5 and the high-density sound absorbing material 71 at the shortest distance, the noise is reflected in a direction different from the incident direction because the partition plate 6 is bent in a folding screen shape or a mountain shape. Is done. In this case, since the transmission distance of the high-density sound absorbing material 71 is longer than the incident time, the sound absorbing performance is improved. However, there may be noise that enters the second wall structure side through the partition plate 6.
On the other hand, the sound absorbing material 72 filled with no gap between the partition plate 6 and the back plate 8 has a low density configuration. Specifically, the sound absorbing material 72 has a low density of 5 kg / m ³ or more and less than 25 kg / m ^3. As a simple structure, the sound insulation performance of the second wall structure is enhanced. That is, since the second wall structure is filled with the low-density sound absorbing material 72 between the partition plate 6 and the back plate 8 without any gap, it is possible to prevent the sound insulation performance from being lowered due to resonance transmission. In this case, the partition plate 6 is bent in a folding screen shape or a mountain shape and is difficult to fill the sound absorbing material 72, but the sound absorbing material 72 has a low density configuration of 5 kg / m ³ or more and less than 25 kg / m ^3. As a result, the sound absorbing material 72 is suitable for the work of filling the space between the partition plate 6 and the back plate 8 without any gaps, and is supported in close contact with each of the partition plate 6 and the back plate 8. 6 can be suppressed, and a decrease in sound insulation performance due to resonance transmission can be prevented.

As shown in FIG. 3, the sound-absorbing material 71 disposed between the porous front plate 5 and the partition plate 6 has a high-density configuration with a thickness of about 50 mm made of polyester fiber or the like.
As an example, the partition plate 6 is formed by bending a non-porous metal plate such as a galvanized steel plate into a gentle folding screen or mountain shape with an amplitude necessary for an air layer (for example, 30 mm). Therefore, a gap is formed between the high-density and hard sound absorbing material 71 and the partition plate 6, and this is formed as the air layer 15.
The partition plate 6 in FIG. 3 is made of a slightly thick (heavy plate) galvanized steel plate with a thickness of 2.3 mm, and a substantially double mountain with a crest angle of about 160 ° in the vertical direction of the metal sound insulation panel 1. However, the present invention is not limited to this bent shape. Although illustration is omitted, in some cases, it may be implemented by a wave-shaped partition plate that is bent into a substantially gentle V-shape, or conversely, the number of peaks is bent more than three.
Depending on the case, the metal sound insulation panel 1 shown in FIG. 2 can be similarly implemented with a partition plate configured to be bent in a gentle folding screen shape or a mountain shape in the left-right direction (long side direction). In short, any structure that supports the inner surface of the sound absorbing material 71 on the front side and forms the air layer 15 in the gap between the back surface (inner surface) of the sound absorbing material 71 and the partition plate that supports the sound absorbing material 71 is sufficient.

  Next, the back plate 8 is made of a non-porous metal plate such as a fluorine-laminated steel plate. Incidentally, the back plate 8 is formed of a lightweight plate having a plate thickness of, for example, 1.6 mm, which is thinner than the partition plate 6. Thus, by configuring the thickness of the back plate 8 with a lightweight plate that is thinner than the thickness of the partition plate 6, the surface density of both plates can be made different to prevent a decrease in sound insulation performance due to resonance. .

On the other hand, the sound absorbing material 72 constituting the second wall structure material is also made of a low density with a thickness of about 60 mm using, for example, polyester fiber. Since this fixed form sound absorbing material 72 at a low density of less than 5 kg / m ³ or more 25 kg / m ³ as described above is a low structure, as shown in the right half of FIG. 3, following the mid flexion of the partition plate 6 Thus, the rear partition plate 6 and the rear plate 8 are supported in close contact with the rear surface without any gap. In addition, since the interval between the partition plate 6 bent in the folding screen or the mountain shape and the back plate 8 is not constant, the effect of preventing the sound insulation performance from being lowered due to the resonance between the partition plate 6 and the back plate 8 is exhibited. Reasonable composition.

The non-porous upper surface plate portion 9 and the lower surface plate portion 10 formed in series above and below the non-porous back plate 8 are, as shown in FIG. 4A and FIG. An outer shell casing is formed which is joined by the blind rivet 11 and covers the outer periphery of the partition plate 6 and the two front and rear sound absorbing materials 71 and 72. Further, as shown in FIG. 5, the opening portions on both side surfaces of the outer shell casing are closed by side plates 12 formed in substantially the same shape as the opening portions. A metal sound insulation panel 1 having a hermetically sealed structure is formed by integrally joining with rivets 11.
The back plate 8 is configured integrally with a series of the upper surface plate portion 9 and the lower surface plate portion 10 on the upper and lower sides thereof, and the total plate material area is larger than that of the partition plate 6, so that the above paragraph [0024] As described in the above, as a means for obtaining the effect of preventing the deterioration of the sound insulation performance due to resonance by changing the surface density of both plates, the thickness of the partition plate 6 is increased, and conversely, the thickness of the back plate 8 and the like The structure is small. As a result, the effect of reducing the weight of the metal sound insulation panel can be obtained while exhibiting the same sound insulation performance as compared with the case where the thickness of the back plate 8 is increased.

In addition, as shown in FIG.3 and FIG.4a and b, the upper-surface board part 9 and the lower-surface board part 10 which were formed in series at the upper and lower sides of the backplate 8 have the center part in the upper-surface board part 9. As shown in FIG. Convex ridges 9a are formed in a trapezoidal shape with a length that extends almost the entire length in the longitudinal direction and rises to a height of about 20 mm. Contrary to this, the lower surface plate portion 10 is formed with a concave groove portion 10a having the same shape and the same size as the convex portion 9a, which has almost the entire length of the central portion thereof, and into which the convex portion 9a fits almost closely. Accordingly, when the sound insulation wall shown in FIG. 1 is constructed, the metal sound insulation panels 1 are built and stacked in multiple stages between the vertical grooves of the two adjacent columns 3 and 3 built on the concrete foundation 2. At the time, by fitting the groove portion 10a formed on the lower surface plate portion 10 of the upper metal sound insulation panel 1 on the convex portion 9a raised on the upper surface plate portion 9 of the lower metal sound insulation panel 1, Thus, a stable stacked structure with a large shear resistance in the out-of-plane direction can be obtained.
However, the metal sound-insulating panel 1 is configured by the flat upper surface plate portion 9 and the lower surface plate portion 10 without providing the above-mentioned protruding strip portion 9a and the concave groove portion 10a on the upper surface plate portion 9 and the lower surface plate portion 10, It is also possible to build sound insulation walls by building and stacking in multiple stages.

Next, the relationship between the above-described partition plate 6 and the outer shell casing is obtained by bending the upper and lower end portions of the partition plate 6 into a substantially L shape in the case of the embodiment shown in FIGS. The formed bent sides 6a and 6b are abutted with the upper surface plate portion 9 and the lower surface plate portion 10 of the outer shell casing with a sealing material 13 made of chloroprene rubber having a thickness of about 2 mm as an example. In this case, the blind rivets 11 are integrally joined. Further, as illustrated in FIG. 5, the edge of both sides of the same partition plate 6 is bonded to the inner surface of the side plate 12, which covers both side portions of the outer shell casing, by way of example, with a foam molding sealing material 14. Thus, the sealing material 14 is sandwiched between them.
However, the illustrated embodiment is based on the premise that the partition plate 6 is bent in a folding screen or mountain shape in the vertical direction as shown in FIG. However, when folding or mountain-shaped bending of the partition plate 6 is performed in the left-right direction in FIG. 2, a bent side 6a bent substantially in an L shape at both left and right ends of the partition plate 6. , 6b is formed, and the sealing material 13 is sandwiched and joined to the inner surface of the side plate 12 that covers both side portions of the outer casing. In addition, the upper and lower edges of the same partition plate 6 are configured such that the sealing material 14 is attached to the inner surfaces of the upper surface plate portion 9 and the lower surface plate portion 10 of the outer shell casing, and the sealing material 14 is sandwiched therebetween. Will be implemented.
According to said structure, propagation of the noise and vibration which are transmitted from the partition plate 6 to the backplate 8 is interrupted | blocked by the sealing materials 13 and 14, and the fall of sound insulation performance can also be prevented.

  Although the present invention has been described above based on the illustrated embodiment, the present invention is not limited to the illustrated embodiment. It will be mentioned as a reminder that the present invention includes the scope of design changes and other modifications / applications made by those skilled in the art as needed.

DESCRIPTION OF SYMBOLS 1 Metal sound-insulation panel 5 Porous front plate 5a Hole 71, 72 Sound-absorbing material 6 Partition plate 8 Back plate 9 Upper surface plate portion 10 Lower surface plate portion 12 Side surface plates 6a, 6b Bending side 13 Sealing material 14 Sealing material 9a Convex strip portion 10a Concave groove

Claims (7)

The upper and lower plate portions are formed so that the vertical cross section is substantially U-shaped at the top and bottom of the back plate, and a porous front plate having a large number of holes is joined to the front side of the upper and lower plate portions. An outer shell casing is formed, and openings on both side surfaces of the outer shell casing are closed with side plates,
Inside the outer shell casing is provided with a partition plate in which a non-porous metal plate is bent in a folding screen or mountain shape, the upper part of the partition plate is the upper surface plate part, and the lower part of the partition plate is the It is joined to the bottom plate,
A sound absorbing material is disposed between the perforated front plate and the middle partition plate to form a first wall structure, and the second wall structure is also filled with a sound absorbing material between the middle partition plate and the rear plate without a gap. A metal sound insulation panel having a double wall structure, characterized by being formed.   The sound-absorbing material disposed between the porous front plate and the partition plate has a high-density configuration, and the sound-absorbing material filled without a gap between the partition plate and the back plate has a low-density configuration. A metal sound insulation panel having a double wall structure according to claim 1. The sound absorbing material disposed between the porous front plate and the partition plate has a high-density configuration of 25 kg / m ³ or more and 50 kg / m ³ or less, and the sound absorbing material filled with no gap between the partition plate and the back plate is The metal sound-insulating panel having a double-wall structure according to claim 1 or 2, wherein the metal sound-insulating panel has a low-density configuration of 5 kg / m ³ or more and less than 25 kg / m ³ .   The metal sound insulation panel having a double wall structure according to any one of claims 1 to 3, wherein a thickness of the intermediate partition plate is a heavy plate configuration thicker than a thickness of the back plate. .     The partition plate obtained by bending a non-porous metal plate into a folding screen type or a mountain shape is formed in a single V-shape or a double M-shape. A metal sound insulation panel having the double wall structure described in any one of the above.   The bent sides formed at both ends in the bending direction of the middle partition plate are joined with the outer casing and the sealing material facing each other, and the edges of both sides perpendicular to the bending direction in the middle partition plate are: The metal sound-insulating panel having a double wall structure according to claim 1, wherein the metal sound-insulating panel has a double-wall structure according to claim 1, wherein the metal sound-insulating panel is joined to a side plate facing this.   The metal sound insulation panel having a double wall structure according to claim 6, wherein the sealing material is foamable rubber or viscoelastic rubber.

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