JP4437278B2 - Soundproof plate and soundproof structure using the same - Google Patents

Description

  The present invention relates to a soundproofing structure that blocks noise generated from a roadbed of a bridge, and a soundproofing plate suitably used for the soundproofing structure.

  In bridges and viaducts, the roadbed is divided into multiple segments to prevent the bridge from being bent or damaged due to expansion or contraction of the roadbed due to changes in temperature or sunshine. is doing. That is, even if the temperature rises and each segment extends in the road extension direction, the gap between the segments absorbs the extension of each segment and prevents the bridge or the like from being bent or damaged.

  By the way, when the roadbed is divided into a plurality of segments and a predetermined gap is provided between the segments in this way, the noise generated by driving the automobile diverges downward from the bridge, etc., resulting in a noise problem. Could cause. In particular, since the gap between the segments widens in the winter, noise is significantly generated, and it is necessary to take appropriate soundproofing measures.

  Even when such a roadbed connecting part is not provided, if a road is provided in the lower part of the viaduct or the like, noise is generated from a car or train passing through the viaduct and In some cases, noise standards were exceeded.

  Conventionally, various soundproof structures for blocking noise generated from the bridge floor have been proposed. For example, a bracket attached to the lower part of the bridge is attached with a frame material through vibration-proof rubber that blocks transmission of vibrations generated from the road bed, and a normal steel plate, asbestos cement plate, damping steel plate, or A soundproof board such as a vibration control asbestos cement board was fixed using a fixing means such as a bolt.

  Further, the main frequency band f (Hz) of the noise to be sound-insulated, the desired sound transmission loss R (dB), and the desired coincidence frequency fc (Hz) are determined in advance, and these values are substituted into a predetermined calculation formula. To produce a sound insulation plate having a predetermined bending rigidity B (N · m), and to cover the bottom or side surface of the steel girder bridge with the sound insulation plate attached to the steel girder bridge so as to support the steel girder bridge Has disclosed a technique for shielding noise generated from the sound (see Patent Document 1).

JP 2003-342912 A

  However, when using soundproof plates such as ordinary steel plates, asbestos-cement plates, vibration-damping steel plates, or vibration-damping asbestos-cement plates, rust-proofing is necessary to ensure weather resistance, and environmental pollution caused by asbestos There are various problems that the cost is increased due to the cause or the need for a special structure.

  Moreover, in the technique described in the said patent document 1, the sound insulation board designed uniquely for every bridge to perform construction is required, and it was hard to say that cost reduction could be implement | achieved because it lacks versatility and mass-productivity. .

  The present invention has been proposed in order to solve the above-described problems, has a simple structure, is easy to construct, has excellent versatility and mass productivity, and can realize low cost and An object of the present invention is to provide a soundproof plate suitably used for this soundproof structure.

The soundproof plate of the present invention and the soundproof structure using the soundproof plate have the following features in order to achieve the above-described object.
That is, the soundproof plate of the present invention is an expanded metal plate on the upper and lower surfaces of the aluminum shredded thin material so that the aluminum shredded thin material is filled into the frame and the aluminum shredded thin material is stored in the frame. Further, an aluminum shredded thin material holder made of a lightweight material such as a punching metal plate, a thin aluminum plate, or a synthetic resin plate is provided on the frame.

  The soundproof plate having such a configuration uses an aluminum chopped thin material whose upper and lower surfaces are sandwiched between expanded metal plates, so that noise is blocked by a large number of gaps existing in the aluminum chopped thin material. The

Further, the soundproof structure of the present invention is a soundproof structure that is provided at the lower part of the roadbed of the bridge and blocks noise generated from the roadbed,
In the housing support frame attached to the lower part of the road bed and having an open upper surface, a water drainage material, a soundproof material, a vibration proof material, and a lower support material are disposed from above to below,
The soundproofing material is formed by connecting a plurality of soundproofing plates in a flat shape, and each soundproofing plate is filled with aluminum shredded thin material cut into strips, and the aluminum shredded thin material should be stored in the frame. An aluminum shredded thin material holder made of a lightweight material such as an expanded metal plate, a punching metal plate, a thin aluminum plate, or a synthetic resin plate is provided on the upper and lower surfaces of the aluminum shredded thin material. .

  In the soundproof structure having such a configuration, the water proofing material, the soundproofing material, the vibration proofing material, and the lower support material are arranged in the housing support frame so as to overlap each other in the vertical direction, and the housing support frame is provided with a bolt or the like. It is used by attaching to the lower part of the road bed using the fixed member.

  Rainwater or the like leaking from the roadbed is blocked by the water drainage material and does not penetrate into the soundproofing material or the like, so that the reduction of the soundproofing effect can be prevented. In addition, since the soundproof plate constituting the soundproof material uses the aluminum chopped thin material whose upper and lower surfaces are sandwiched by the expanded metal plate as described above, a large number of voids existing in the aluminum chopped thin material. The noise is cut off. Moreover, since the vibration generated from the road bed is absorbed by the vibration isolating material, the sound insulation effect can be further enhanced. Furthermore, since the water-proofing material, the soundproofing material, and the vibration-proofing material are firmly supported by the lower support plate, the strength of the soundproofing structure can be increased.

In addition to the above structure, the soundproofing structure of the present invention is made of an aluminum plate.
The vibration isolator is made of an elastomer plate,
The lower support member is made of a hollow aluminum plate.

  The soundproof structure having such a configuration is excellent in weather resistance and durability because an aluminum material is used as the water proofing material and the lower support plate. Moreover, since the elastomer plate is used as the vibration isolating material, a high vibration isolating effect can be exhibited.

In the soundproof structure of the present invention, in addition to the above structure, the drainage material, the soundproof material, the vibration isolator, and the lower support plate are each provided with a drain pipe insertion hole that communicates vertically. The drainage pipe is inserted into the drainage pipe insertion hole in series.
In the soundproof structure having such a configuration, rainwater or the like blocked by the water proofing material is discharged to the outside of the soundproof structure through the water distribution pipe.

  The soundproof board of the present invention has a structure in which a frame is filled and held with an aluminum chopped thin material sandwiched by an aluminum chopped thin material holder made of a lightweight material such as an expanded metal plate. Therefore, since the structure is simple, manufacture is easy, and since no special member is used, it is excellent in versatility and mass productivity, and cost reduction can be realized.

  In the soundproof structure of the present invention, the water proofing material, the soundproofing material, the vibration proofing material, and the lower support material are arranged in the housing support frame so as to overlap each other in the vertical direction, and the housing support frame is fixed to a fixing member such as a bolt. It is only necessary to attach to the lower part of the road bed using the, and since the structure is simple, the construction is easy and the cost can be reduced.

  In addition, the soundproof structure of the present invention can be easily manufactured using a generally available aluminum plate, elastomer plate, and hollow aluminum plate without using a special material. This makes it possible to achieve a further reduction in cost.

  In addition, the soundproof structure of the present invention is provided with a drainage pipe insertion hole for vertically communicating the water proofing material, the soundproofing material, the vibration proofing material, and the lower support plate, and a series of drainage pipes in the drainage pipe insertion hole. Since it is inserted, rainwater or the like does not enter the soundproof structure. Therefore, there is no possibility that the soundproofing effect is impaired, and corrosion of the member due to intrusion of rainwater or the like can be prevented.

  Hereinafter, embodiments of a soundproof plate of the present invention and a soundproof structure using the same will be described with reference to the drawings.

<Soundproof board>
FIG. 1 is an exploded perspective view of a soundproof plate according to an embodiment of the present invention. 2 shows a method for assembling the soundproof plate according to the embodiment of the present invention. FIG. 2 (a) is a perspective view of the soundproof plate in a completed state, and FIG. 2 (b) is an exploded perspective view showing the assembly process. FIG.

  As shown in FIGS. 1 and 2, a soundproof plate 10 according to an embodiment of the present invention includes an aluminum shredded thin material 11 cut into a strip shape and a pair of expands that sandwich the aluminum shredded thin material 11 from above and below. An aluminum shredded thin material holder 12 such as a metal plate is formed in a frame 13.

<Aluminum shredded thin material>
The aluminum shredded thin material 11 is obtained by shredding an aluminum foil having a thickness of about 20 μm into a width of about 3 mm with a shredder or the like and compressing the shredded material so as to have an appropriate density. Specifically, the shredded aluminum foil is compressed to about 8 kg per 1 m ^{2 to} form a plate shape with a thickness of about 40 mm, and a plurality of air gaps are formed inside.

<Aluminum shredded thin material holder>
As the aluminum chopped thin material holder, for example, a commercially available expanded metal plate or the like formed by pressing an iron plate into a mesh shape is used. The aluminum shredded thin material holding body sandwiches the aluminum shredded thin material 11 from above and below, holds the aluminum shredded thin material 11 in the frame with an appropriate amount of filling, and the aluminum shredded thin material 11 pushes it. It is a member to protect against being crushed. In addition to an expanded metal plate, an appropriate material such as a punching metal plate, a thin aluminum plate, or a synthetic resin plate can be used. Since the effect is high, the material is not particularly limited as long as it has a function of holding the aluminum shredded thin material in the frame. However, it is best to use expanded metal from the viewpoint of strength and light weight.

<Frame body>
The frame 13 includes an outer frame 13a formed in a rectangular frame shape, and a reinforcing frame 13b that is stretched over a substantially middle portion of the opposed long sides, and at least one of the short sides 13c of the outer frame 13a. Is configured to be removable.

<Manufacture of soundproof plates>
To manufacture the soundproof plate 10, as shown in FIG. 2 (b), one of the short sides 13c constituting the outer frame 13a is removed from the outer frame 13a to be an open portion, and the open portion is inserted into the outer frame 13a. What is necessary is just to slide and insert the aluminum shredded thin material 11 with the upper and lower surfaces sandwiched between the expanded metal plates 12, and attach the short side 13c to the open portion. Thus, after the expanded metal plate 12 and the aluminum shredded thin material 11 are inserted into the outer frame 13a, the detachable short side 13c is fixed to the outer frame 13a by welding, bonding, bolting, or the like. By fixing with, 1 unit of soundproof board 10 as shown to Fig.2 (a) is manufactured.

<Soundproof structure>
The soundproof plate 10 of the present embodiment is particularly suitably used for a soundproof structure that blocks noise generated from the roadbed of a bridge. A soundproof structure according to an embodiment of the present invention will be described with reference to FIGS.

  3 to 5 show a soundproof structure according to an embodiment of the present invention, FIG. 3 is a perspective view showing members constituting the soundproof structure, and FIG. 4 is a part of a state in which the soundproof structure is attached to the road floor. FIG. 5 is a partial sectional view of a state in which a soundproof structure is attached to the viaduct.

  As shown in FIGS. 3 to 5, the soundproof structure 20 according to the embodiment of the present invention is used by being attached to the lower part of the road bed 200. In the downward direction, the water drainage material 40, the soundproof material 50, the vibration isolation material 60, and the lower support material 70 are arranged.

<Housing support frame>
The housing support frame 30 has a housing shape with an open upper surface, and is a member that accommodates the water proofing material 40, the soundproof plate 10, the vibration isolating material 60, and the lower support material 70 therein. The housing support frame 30 has a mounting piece 31 extending from the open end of the upper surface along the road extending direction. The mounting piece 31 has a bolt mounting length in which the road extending direction is the long axis direction. A plurality of holes (not shown) are provided.

<Waterproofing material>
The drainage material 40 is made of, for example, an aluminum plate having a thickness of about 0.5 mm. By this drainage material 40, rainwater can be prevented from entering the soundproof board 10 from the roadbed 200. In addition, it is preferable that the water proofing material 40 is an aluminum plate from the viewpoint of weather resistance, durability, etc., but other metal plates such as stainless steel, etc., as long as the member does not cause problems such as weather resistance, durability, etc. Alternatively, a synthetic resin plate can be used.

<Soundproof material>
The soundproofing material 50 is configured by connecting a plurality of soundproofing plates 10 in a planar shape, and the area can be adjusted by appropriately increasing or decreasing the number of the soundproofing plates 10 according to the construction environment of the soundproofing structure 20. .

<Vibration isolator>
The vibration isolator 60 is made of an elastomer plate having a thickness of about 6 mm, for example. The vibration isolator 60 can prevent each member constituting the soundproof structure 20 from resonating with the vibration of the road bed 200. The vibration isolator 60 is preferably an elastomer plate in that it exhibits a high anti-vibration function and is easily available, but any member that can exhibit the anti-vibration function may be a rubber plate or Other synthetic resin plates can also be used.

<Lower support material>
The lower support member 70 is made of an extruded hollow aluminum plate having a thickness of about 3 mm, for example. The lower support member 70 supports the water shield 40, the soundproof material 50, and the vibration isolator 60 from the lower side, and the soundproofing effect can be further enhanced by the hollow portion. The lower support member 70 is preferably a hollow aluminum plate in terms of enhancing weather resistance, durability, and soundproofing effect, but does not cause problems such as weatherability and durability, and further enhances the soundproofing effect. If it is a member which can be used, other metal hollow plates, such as stainless steel, and a synthetic resin hollow plate can also be used.

<Drain pipe>
The drainage material 40, the soundproof material 50, the vibration isolation material 60, and the lower support material 70 are provided with drain pipe insertion holes 41, 51, 61, 71 that communicate with each other in the vertical direction. 41, 51, 61, 71 are inserted through a series of drain pipes 80. Moreover, the lower end part of the drain pipe 80 is extended to the vicinity of the road surface 100 provided under the viaduct (guard) 90 as shown, for example in FIG.

<Mounting of soundproof structure>
The soundproof structure 20 is used by being attached to the lower part of the roadbed connecting part 110 as shown in FIG. 4 or attached to the lower part of the viaduct 90 as shown in FIG. FIG. 4 assumes a bridge such as a highway, and FIG. 5 assumes a railway viaduct. In the example shown in FIG. 5, a general road is provided under the viaduct 90, and the guard rail 120 that separates the road from the sidewalk and the vehicle 130 that travels on the road are shown.

  When using the soundproof structure 20 attached to the lower part of the roadbed connecting part 110 or attaching the soundproof structure 20 to the lower part of the viaduct 90, the size of the soundproof structure 20 is different. It is necessary to change the thickness and material of each member. However, the basic structure of the soundproof structure 20 is substantially the same as that described above regardless of the construction site.

  In the example shown in FIG. 4, the soundproof structure 20 is attached to the lower part of the roadbed connecting part 110 along the width direction of the road (the roadbed connecting part 110). In the example shown in FIG. 5, the soundproof structure 20 is attached to the lower part of the road bed 200 along the width direction of the viaduct 90 (the width direction of the road provided under the viaduct 90).

  In order to attach the soundproof structure 20 of the present embodiment to the lower part of the roadbed 200 of the bridge such as the roadbed connecting part 110 and the viaduct 90, for example, as shown in FIG. The bolt 32 is inserted into the bolt mounting hole, and the tip of the bolt 32 is screwed to the lower surface of the road bed 200. Next, the bolt 32 is inserted into the bolt mounting elongated hole 35 provided in the mounting piece 34 of the other housing support frame 30, and the tip end of the bolt 32 is screwed to the lower surface of the road bed 200 to complete the mounting.

  Even when the gap between adjacent segments changes in the roadbed connecting part 110 or the length of the roadbed 200 changes in the viaduct due to changes in the temperature, sunshine, etc., the bolt 32 is the bolt mounting length. It can move within the range of the hole, and deformation and breakage of the soundproof structure 20 can be prevented.

  Moreover, when attaching the soundproof structure 20 to the lower part of the road bed 200, it is preferable to attach the housing support frame 30 so as to incline downward toward the drain pipe 80 side. The inclination angle of the housing support frame 30 can be changed as appropriate according to the construction site, but generally has an inclination of about 3 ° to 5 ° with respect to the lower surface of the road bed 200, for example. A housing support frame 30 is attached.

<Comparison of soundproof effect>
Next, the comparison result of the soundproof effect between the soundproof structure 20 of the present invention and the soundproof structure using the conventional soundproof panel will be described.

<Sample used for comparison>
In the soundproof structure 20 of the present invention, a soundproof panel having a thickness of 40 mm using an aluminum shredded thin material, a vibration isolating material having a thickness of 6 mm made of an elastomer plate, and a lower support material having a thickness of 20 mm made of an aluminum hollow material are used. ing. In the soundproof structure 20 of the present invention used for the comparative test, the setting is made so as to satisfy the same condition as the sound source level of the sound source room of Comparative Example 2.

  In Comparative Example 1, a 20 mm thick soundproof panel (corresponding to the lower support plate of the present invention) made of a hollow aluminum material is used.

  In Comparative Example 2, a 6 mm thick vibration-proof material made of an elastomer plate and a 20 mm thick sound-proof panel made of an aluminum hollow material (corresponding to the lower support plate of the present invention) are used.

  In FIG. 6 and FIG. 7, reference numeral “1” shown in the sample column indicates Comparative Example 1, reference numeral “2” indicates Comparative Example 2, and reference numeral “3” indicates the soundproof structure 20 of the present invention. 8 to 9, the white circle represents Comparative Example 1, the black circle represents Comparative Example 2, and the x mark represents the soundproof structure 20 of the present invention.

<Explanation of comparison results>
6 to 8 show comparison results in the soundproof structure 20 of the present invention, Comparative Example 1 and Comparative Example 2, and FIG. 6 is a comparative diagram showing comparison results of F characteristic (dB) and A characteristic (dB). FIG. 7 shows a comparison of the A characteristic correction value (k), the sound pressure level (LA) after the A characteristic correction, the sample surface radiation power level (Lw0), the sound transmission loss (TL), and the sound source room sound pressure level (Ls). FIG. 8 is a comparative graph showing the result of sound transmission loss 1/3 octave band frequency analysis, FIG. 9 is a comparative graph showing the result of 1/3 octave band frequency analysis (F characteristics), and FIG. It is a comparative graph which shows a 3 octave band frequency analysis result (A characteristic). 8 to 10 show test results using impact sounds (golf balls).

<Comparative test method>
In this comparative test, the sound pressure level of the sound source room is estimated based on the test result, the sound pressure level of the sound receiving room is estimated based on the estimated sound pressure level and the sound transmission loss test result, and the F characteristic and the A characteristic. The above 1/3 octave band sound pressure level and all-pulse sound pressure level were estimated, and FIGS.

<Comparison result>
As is apparent from FIG. 8, when the values after auditory correction (A characteristic correction) are compared, the comparative example 2 has a 5.3 dB sound reduction effect, and the soundproof structure 20 of the present invention has a sound reduction effect. There was a sound reduction effect of 10.0 dB. Further, compared with Comparative Example 2, the soundproof structure 20 of the present invention had a sound reduction effect of 4.7 dB.

  Further, as is clear from FIGS. 9 to 10, the sound transmission loss of Comparative Example 2 and the soundproof structure 20 of the present invention is generally better than that of Comparative Example 1. In particular, at a high frequency of 1,000 Hz or higher, the soundproof structure 20 of the present invention has a better sound transmission loss of 10 dB or more than the comparative example 1.

In Comparative Example 1 and Comparative Example 2, there is a slight drop in sound transmission loss near 800 Hz, which is probably due to the coincidence effect (a phenomenon in which sound transmission loss is reduced at a specific frequency depending on the material).
As described above, according to the soundproof structure 20 of the present invention, an excellent soundproofing effect can be exhibited as compared with Comparative Example 1 and Comparative Example 2.

The exploded perspective view of the soundproof board concerning the embodiment of the present invention. The perspective view (a) of the completion state of the soundproof board concerning embodiment of this invention, and the disassembled perspective view (b) which show an assembly process. The perspective view which shows the member which comprises the soundproof structure which concerns on embodiment of this invention. The partial cross section perspective view of the state where the soundproof structure concerning the embodiment of the present invention was attached to the roadbed. The partial sectional view of the state where the soundproof structure concerning the embodiment of the present invention was attached to the viaduct. The comparison figure which shows the comparison result of F characteristic in the soundproof structure which concerns on embodiment of this invention, and a comparative example, and A characteristic. The comparison figure which shows the comparison result of the A characteristic correction value in the soundproof structure which concerns on embodiment of this invention, the sound pressure level after A characteristic correction | amendment, a sample surface radiation | emission power level, sound transmission loss, and a sound source room sound pressure level. The comparative graph which shows the sound transmission structure which concerns on embodiment of this invention, and the sound transmission loss in a comparative example 1/3 octave band frequency analysis result. The comparative graph which shows the 1/3 octave band frequency analysis result (F characteristic) in the soundproof structure which concerns on embodiment of this invention, and a comparative example. The comparative graph which shows the 1/3 octave band frequency analysis result (A characteristic) in the soundproof structure which concerns on embodiment of this invention, and a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Soundproof board 11 Aluminum shredded thin material 12 Expanded metal board 13 Frame 13a Outer frame 13b Reinforcement frame 13c Short side 20 Soundproof structure 30 Housing support frame 31 Mounting piece 32 Bolt 40 Water drainage material 41 Drain pipe insertion hole 50 Soundproof material 51 Drainage pipe insertion hole 60 Anti-vibration material 61 Drainage pipe insertion hole 70 Lower support material 71 Drainage pipe insertion hole 80 Drainage pipe 90 Viaduct 100 Road surface 110 Roadbed connection part 120 Guard rail 130 Vehicle 200 Roadbed

Claims (3)

A soundproof structure that is provided at a lower part of the roadbed of the bridge and blocks noise generated from the roadbed;
In the housing support frame attached to the lower part of the road bed and having an open upper surface, a water drainage material, a soundproof material, a vibration proof material, and a lower support material are disposed from above to below,
The soundproofing material is formed by connecting a plurality of soundproofing plates in a flat shape, and each soundproofing plate is filled with aluminum shredded thin material cut into strips, and the aluminum shredded thin material should be stored in the frame. A soundproof structure characterized in that an aluminum shredded thin material holder made of a lightweight material such as an expanded metal plate, a punching metal plate, a thin aluminum plate, or a synthetic resin plate is provided on the upper and lower surfaces of the thin aluminum shredded material. The drainage material is made of an aluminum plate,
The vibration isolator is made of an elastomer plate,
Soundproof structure according to claim 1, wherein said lower support member is characterized by comprising a hollow aluminum plate. The drainage material, the soundproof material, the vibration proofing material, and the lower support plate are each provided with a drain pipe insertion hole that communicates vertically, and a series of drain pipes are provided in the drain pipe insertion hole. The soundproof structure according to claim 1 or 2 , wherein the soundproof structure is inserted.

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