JP2012062701A - Soundproof structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soundproof structure with excellent sound insulation property in addition to air permeability and daylighting properties.SOLUTION: A soundproof structure has a plurality of hollow bodies arranged in parallel at predetermined intervals. The plurality of hollow bodies have reflection surfaces each at a sound incident side for reflecting incident sound, and include hollow parts 30A to 30C each serving as a helmholtz resonator. The hollow part has a longitudinally extending slit-like opening communicated with the hollow part in a surface opposite the adjacent hollow body. The hollow body is formed by combining two or more shapes which extend in an axial direction of the hollow body. The opening is defined by counter portions of the shapes.

Description

  The present invention relates to a soundproof structure having a soundproofing function, and particularly to a soundproof structure excellent in air permeability and daylighting.

Conventionally, as a general soundproof structure, what was described in patent documents 1 and 2 is known.
The soundproof structure of Patent Document 1 has a structure in which a panel material filled with a sound absorbing material such as glass wool is supported by a column, and is installed so that the column is hidden by the panel material to obtain a soundproofing effect. Is.
In addition, the soundproof structure of Patent Document 2 is provided with a soundproof structure using sound absorption by the Helmholtz resonator, in which openings constituting a so-called Helmholtz resonator are arranged in parallel on the surface of the panel material.

JP-A-10-338913 Japanese Patent No. 2547927

In the soundproof structures of Patent Documents 1 and 2, since both are soundproofed using a panel material, there is a problem that the space is partitioned by the panel material, and the air permeability and the daylighting property are impaired by the installation. .
In order to obtain air permeability and daylighting, for example, it is conceivable to form the panel material into a thin louver shape or a fence shape. However, if this is done, incident sound will pass between the louvers and between the fences. It was difficult to effectively block the incident sound.
As described above, two contradictory functions of air permeability, daylighting, and soundproofing are required. However, at present, a soundproofing structure that satisfies these functions has not been obtained.

  From such a viewpoint, it is an object of the present invention to provide a soundproof structure having excellent soundproofing properties while having air permeability and daylighting properties.

  A soundproof structure according to the present invention that solves such a problem is a soundproof structure in which a plurality of hollow bodies are arranged side by side at intervals, and the plurality of hollow bodies are on the side on which sound is incident. And has a hollow portion that functions as a Helmholtz resonator, and the hollow body communicates with the hollow portion on a surface facing the adjacent hollow body. A slit-like opening extending in the longitudinal direction is provided.

  According to this soundproof structure, since the plurality of hollow bodies have the reflection surface that reflects the incident sound on the side on which the sound is incident, the incident sound can be directly reflected and blocked by the reflection surface. it can. On the other hand, the incident sound between the hollow bodies is caused by the change in the cross section of the passage width between the opening width between the hollow bodies and the opening width obtained by adding the depth of the hollow portion through the slit-like opening between the hollow bodies. (Sound resistance) Reflected by causing a change. Furthermore, the incident sound between the hollow bodies is absorbed by the friction loss of the slit portion that functions as a Helmholtz resonator through the slit-shaped opening.

Therefore, by these three synergistic effects, the ratio of the sound passing between the hollow bodies is reduced with respect to the incident sound.
Therefore, it is possible to obtain a soundproof structure having excellent soundproofing properties while ensuring air permeability and daylighting through the hollow bodies.

  Further, in the present invention, the hollow body is configured by combining two or more shapes extending in the axial direction of the hollow body, and the opening is formed by a facing portion between the shapes. It is good to do.

According to this soundproof structure, when a hollow body is formed by combining two or more shapes extending in the longitudinal direction, the opening can be formed together. Therefore, it is not necessary to separately form an opening, and the manufacturing process of the hollow body is simplified.
Moreover, when forming a some hollow part in a hollow body, it can form simply by the combination of a shape material.

  Further, when the hollow body is made of an extruded product made of aluminum alloy or resin, the hollow body can be easily manufactured. In addition, an extruded shape made of an aluminum alloy has high dimensional accuracy and is lightweight while having strength. Therefore, a soundproof structure that acts as a desired Helmholtz resonator can be manufactured with high accuracy.

Moreover, it is good to set it as the structure by which the sound-absorbing material is arrange | positioned in the hollow part of the said hollow body.
By setting it as such a structure, a sound absorption effect can be improved more and a soundproofing function can be improved.

Moreover, it is good for the opposing surface of the said adjacent hollow body to be comprised so that a cross section may include a curve.
By comprising in this way, it becomes possible to reduce the whistling phenomenon produced by the air which passes between hollow bodies.

  ADVANTAGE OF THE INVENTION According to this invention, the soundproof structure excellent in soundproofing property while having air permeability and lighting property is obtained.

It is a perspective view which shows the fence as a soundproof structure which concerns on 1st Embodiment of this invention. It is an exploded perspective view of a fence similarly. (A) is a schematic top view which shows the arrangement | positioning state of a vertical cross, (b) is a partially abbreviated front view of a fence. (A) is a partially omitted side cross-sectional view of the fence, and an enlarged cross-sectional view showing the engaging portion of the cross rail. (A) is a top view of a vertical beam, (b) is an exploded plan view of a vertical beam. (A) (b) is an operation explanatory view of a vertical beam. It is a figure which shows the fence as a soundproof structure which concerns on 2nd Embodiment of this invention, (a) is a schematic plan view which shows the arrangement | positioning state of a vertical cross, (b) is a partially abbreviated front view of a fence. It is a partial omission side sectional view of the fence of a 2nd embodiment. (A)-(c) is a schematic plan view which shows the modification of a vertical beam. (A) is a top view of the vertical beam which concerns on a modification, (b) is an exploded top view, (c) is explanatory drawing which showed the connection with a horizontal beam. (A) is a top view of the vertical beam which concerns on a modification, (b) is an exploded top view, (c) is explanatory drawing which showed the connection with a horizontal beam. It is a schematic plan view which shows the example of arrangement | positioning of the vertical cross which concerns on FIG. 10, FIG. (A) and (b) are the schematic plan views of the vertical rail which concerns on a modification. (A) and (b) are the schematic plan views of the vertical rail which concerns on a modification. (A)-(c) is a schematic plan view of the vertical bar which concerns on a modification. (A)-(d) is a schematic plan view of the vertical bar which concerns on a modification. (A)-(d) is a schematic plan view of the vertical rail which concerns on an Example. It is a figure which shows the relationship between sound transmission loss and a frequency. It is a schematic top view of the vertical cross which concerns on the other modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted. Moreover, although the following embodiment demonstrates the example which applied the soundproof structure to the fence (handrail) installed in a veranda, a balcony, etc., it is not the meaning which limits the structure to which a soundproof structure is applied. In the following description, the direction along the longitudinal direction of the horizontal rail 20 is referred to as “left-right direction”, and the direction orthogonal thereto is referred to as “front-rear direction”.

(First embodiment)
As shown in FIG. 1, the fence F as a soundproof structure according to the present embodiment is supported between a support column 10 that is fixed and erected on a support structure portion K such as a veranda and adjacent columns 10 and 10. And a plurality of vertical bars 30 as a hollow body connected between the pair of upper and lower horizontal bars 20 and 20.
The fence F shown in FIG. 1 includes a plurality of columns 10, 10,... And four vertical bars 30, 30,. It is not intended to limit the number of installed vertical bars 30, but may be changed as appropriate according to the installation status and the like.

The support column 10 is a cylindrical member having a rectangular outer shape in plan view, and is fixed to the fixed portion K1 of the support structure portion K by a fixing means using an anchor bolt (not shown).
The support column 10 is formed of an extruded shape made of an aluminum alloy, and its upper end is closed by a flat lid member 10a. In the present embodiment, the upper surface K2 of the fixing portion K1 is formed to be horizontal and flat.

The horizontal rail 20 is a member that is attached and attached between the upper ends and the lower ends of the adjacent columns 10, 10. A plurality of vertical bars 30 (four vertical bars 30 in this embodiment) are arranged between the upper and lower horizontal bars 20 between the adjacent columns 10 and 10.
As shown in FIG. 2, the upper horizontal rail 20 is configured by combining a base member 21 and a cover member 22, and the lower horizontal rail 20 is configured by only the base member 21.

The base member 21 has a bottom portion 210 and front and rear side walls 211 and 212 that are continuous with the bottom portion 210, and is formed in a substantially U shape in a side view as shown in FIG. .
In the cross rail 20 at the upper end, the base member 21 is installed with the opening formed between the front and rear side walls 211 and 212 facing upward with the bottom portion 210 facing down.
On the contrary, in the lower crosspiece 20 on the lower side, the base member 21 is installed with the bottom portion 210 on the upper side and the opening formed between the front and rear side walls 211 and 212 facing downward, and the fixing member K1 It is installed so that the front ends of the side walls 211 and 212 are in contact with the upper surface K2. That is, the lower horizontal rail 20 also functions as a base for supporting a total of four vertical rails 30.

  A plurality of insertion holes 21 a are formed in the bottom portion 210 of the base member 21 at predetermined intervals in the longitudinal direction at the front and rear edges. The formation position of each insertion hole 21a corresponds to the attachment position of the vertical beam 30, and a fixing bolt 302 for fixing the vertical beam 30 can be inserted into each insertion hole 21a. Specifically, as shown in FIG. 2, each insertion hole 21 a is formed at a position corresponding to a bolt insertion hole 301 formed at each corner of the vertical rail 30.

  As shown in FIG. 4B, engaging protrusions 211a and 212a are formed on the inner side of the distal ends of the side walls 211 and 212, respectively. Is shown only on one side, and so on). The engagement protrusions 211a and 212a are engaged with engagement receiving portions 221a and 222a having substantially the same shape suspended from the top 220 of the cover member 22 so as to face the engagement protrusions 211a and 212a. It is supposed to be.

As shown in FIG. 4A, the cover member 22 has a top portion 220 and front and rear vertical walls 221 and 222 that are continuous with the top portion 220, and covers the base member 21 of the upper horizontal rail 20. It is formed in a substantially U shape in a side view that can be worn.
Engagement pieces 223 and 224 are provided on the inner side of the cover member 22 at intervals from the vertical walls 221 and 222 along the vertical walls 221 and 222. The engagement pieces 223 and 224 are provided so as to protrude downward from the lower surface of the top portion 220, and the engagement receiving portions 223 a and 224 a that protrude in a mountain shape toward the side walls 211 and 212 of the base member 21 at the lower portion. Is formed. Engagement protrusions 211a and 212a can be engaged with the engagement receiving portions 223a and 224a, and the cover member 22 is attached to the base member 21 by this engagement. The cover member 22 may be fixed to the base member 21 using an adhesive, a bolt (not shown), or the like.

  As shown in FIGS. 2 and 3B, the horizontal rails 20 and 20 are fixed to the columns 10 and 10 via brackets 25 that are substantially L-shaped when viewed from the front. As shown in FIGS. 2 and 4A, a screw insertion hole 25a is formed in the bracket 25, and the screw 25b inserted through the screw insertion hole 25a is screwed into the support column 10 and the horizontal rail 20, respectively. By doing so, the crosspiece 20 is fixed to the column 10. In addition, you may make it fix using the volt | bolt and nut which are not shown in figure.

As shown in FIG. 5A, the vertical rail 30 is formed by combining a plurality of extruded shapes (31, 32, 33) made of aluminum alloy, and has a rectangular outer shape in plan view. A plurality of hollow portions 30 </ b> A to 30 </ b> C penetrating in the vertical direction (extrusion direction) are formed inside the vertical beam 30, and upper ends and lower ends thereof are opened. The opening at the upper end of the vertical beam 30 is closed by the lower surface of the bottom portion 210 of the base member 21 that is the upper horizontal beam 20, and the opening at the lower end of the vertical beam 30 is the bottom of the base member 21 that is the lower horizontal beam 20. The upper surface of 210 is closed.
In addition, bolt insertion holes 301 are formed at the four corners of the vertical rail 30 so as to have an open cross section with a C-shaped cross section and penetrate in the vertical direction. As shown in FIG. 2, a fixing bolt 302 can be screwed into the bolt insertion hole 301 through an insertion hole 21 a provided in the base member 21.
The bolt insertion holes 301 may be formed together when extrusion molding, or may be formed by performing a drilling process after extrusion molding. Further, the bolt insertion hole 301 does not have to be an open section having a C-shaped cross section, and may be a closed section as long as the fixing bolt 302 can be inserted.

In the present embodiment, the vertical beam 30 is configured as a joined product in which a plurality of extruded shapes (31, 32, 33) are combined. Specifically, as shown in FIG. 5A, the vertical rail 30 includes a first profile 31, a second profile 32, and a third profile 33 that connects these profiles. It is configured in combination. In addition, joining means, such as welding, an adhesive agent, a screw, a volt | bolt, can be used for joining of shape members.
The first shape member 31 and the second shape member 32 have the same shape, and the first shape member 31 is arranged in a different direction before and after the third shape member 33 to form the second shape member. 32. Therefore, the first shape member 31 and the second shape member 32 can be obtained by cutting one shape member into a suitable length.

As shown in FIG. 5B, the first shape member 31 includes a front portion 311 and side portions 312 and 313 that are continuous to the left and right of the front portion 311. In the present embodiment, the other side portion 313 extends longer in the front-rear direction than the one side portion 312, and in the following description, for convenience of explanation, the side portion 312 is referred to as the short side portion 312. The side portion 313 is referred to as the long side portion 313.
The front surface of the front portion 311 functions as a reflecting surface that reflects incident sound (noise).

Further, an engagement groove 314 having an open cross section having a substantially C-shaped cross section and penetrating in the vertical direction is formed on the rear surface of the front portion 311. An engagement piece 331 a (331 b) formed in the third shape member 33 can be engaged with the engagement groove 314.
In addition, the bolt insertion holes 301 described above are formed at the corners of the front part 311 and the short side part 312 and at the corners of the front part 311 and the long side part 313, respectively.
The rear end portion 312a of the short side portion 312 is bent at a right angle toward the long side portion 313 so as to be parallel to the front portion 311. Further, the rear end portion 313a of the long side portion 313 is bent at a right angle toward the short side portion 312 so as to be parallel to the front portion 311.
In the following description, the front part 311 of the first profile 31, the rear end part 312 a of the short side part 312, and the rear end part 313 a of the long side part 313 are respectively rear parts of the second profile 32. 311 ′, front end 312a ′ and front end 313a ′.

Here, as shown in FIG. 5A, the rear end portion 312a of the short side portion 312 in the first shape member 31 faces the front end portion 333a of the third shape member 33 with a space therebetween, and the front end A slit (slit-like opening) S1 is formed between the portion 333a. Further, the rear end portion 313a of the long side portion 313 in the first shape member 31 is opposed to the front end portion 313a ′ of the second shape member 32 with a space therebetween, and the slit S3 is formed between the front end portion 313a ′. Form.
Further, the front end portion 312a ′ of the short side portion 312 in the second shape member 32 faces the rear end portion 333b of the third shape member 33 with a space therebetween, and the slit S2 is formed between the rear end portion 333b. Form.
These slits S1-S3 form the introduction part of the resonator comprised by each hollow part 30A-30C, and communicate between each hollow part 30A-30C and the exterior.
Each of the slits S1 to S3 is open in the vertical direction (extrusion direction) of the vertical rail 30, and each of the hollow portions 30A to 30C passes through the slits S1 to S3 along the vertical direction of the vertical rail 30 (R1). To R5, see FIGS. 3A and 3B).

The third shape member 33 includes a base portion 331 and a side portion 333 provided in parallel to the base portion 331 via the connecting portion 332, and the first shape member 31 and the second shape member 32 are connected to each other. In addition to having a function as a connecting member to be connected, it also has a function as a partition wall that partitions the inside of the vertical rail 30 into a plurality of rooms (hollow portions 30A to 30C).
The base portion 331 has a flat plate shape, and the front end portion and the rear end portion thereof can be engaged with the engagement groove 314 of the first shape member 31 and the engagement groove 314 of the second shape member 32, respectively. Engagement pieces 331a and 331b extending in the left-right direction are formed.

  As shown in FIG. 5A, the connecting portion 332 is located at a position closer to the rear than the central portion in the front-rear direction of the base portion 331 and the side portion 333 (side closer to the second shape member 32) and the base portion 331. While connecting with the side part 333, the hollow part 30A and the hollow part 30B which are formed in the vertical rail 30 are partitioned off. Thereby, the volume of the hollow part 30A partitioned by the connecting part 332 is made larger than the volume of the hollow part 30B.

  The side portion 333 constitutes a part of the left side wall of the vertical rail 30, and the front end portion 333a of the side portion 333 is opposed to the rear end portion 312a of the first shape member 31 with a space therebetween. It is bent at a right angle toward the base 331. Further, the rear end portion 333b of the side portion 333 is bent at a right angle toward the base portion 331 so as to face the front end portion 312a 'of the second shape member 32 with a space therebetween.

  In addition, the slits S1-S3 which have a predetermined space | interval in the front-back direction of the vertical beam 30 are formed in the state which connected the 1st profile 31 and the 2nd profile 32 via the 3rd profile 33, respectively. As described above, the dimensions of the respective parts of the first shape member 31 to the third shape member 33 are adjusted.

Such a vertical rail 30 slides the engagement piece 331a (331b) of the third profile 33 from the vertical direction in the engagement groove 314 formed in the first profile 31 and the second profile 32. It is possible to assemble by engaging each other. As a result of the assembly, a slit S1 is formed between the rear end portion 312a of the first shape member 31 and the front end portion 333a of the third shape member 33, and the rear end portion 313a of the first shape member 31 and the first end portion 313a A slit S3 is formed between the front end portion 313a ′ of the second shape member 32, and the front end portion 312a ′ of the short side portion 312 in the second shape member 32 and the rear end portion 333b of the third shape member 33. A slit S2 is formed between the two.
In the fence F of the present embodiment, as shown in FIG. 2, the slits S <b> 1 to S <b> 3 are arranged so as to be shifted in the front-rear direction in the passage (so as to be in a non-opposing position).

Next, the soundproofing action of the fence F described above will be described.
Since the front section 311 functions as a reflecting surface that reflects the incident sound T, the plurality of vertical bars 30 have an incident sound T from the front side with respect to the fence F as shown in FIG. Is incident, a part of the incident sound T is directly reflected by the front portion 311.

On the other hand, the incident sound T that has entered between the vertical beam 30 and the vertical beam 30 (including between the vertical beam 30 and the column 10) is provided with an opening width L1 between the vertical beams 30 and 30 and slits S1 to S3. Reflected by causing a change in impedance (acoustic resistance) due to a sudden change in the passage width due to a difference between the opening width L2 to which the depth of the hollow portions 30A to 30C is added through the slits S1 to S3.
Here, as to which frequency band of the incident sound T between the longitudinal bars 30 and 30 is mainly reflected, the specifications of the hollow portions 30A to 30C including the slits S1 to S3 (the Helmholtz resonator) It can be set according to the specification.
The frequency that is suitably reflected by the impedance change is considered to correlate with the calculation formula for obtaining the resonance frequency of the Helmholtz resonator. Therefore, this can be applied and set based on the following formula (1). it can.

f: resonance frequency c: speed of sound (m / sec)
b: Width of slit (S1 to S3) l: Length of slit (S1 to S3) (neck length)
k: coefficient P: aperture ratio (slit width b / slit spacing B)
L: Volume (m ³ ) of the hollow part (30A to 30C)
For symbols b, l, and B, see FIG.

  Further, the incident sound T between the vertical rails 30 and 30 is absorbed by the friction loss of the slits S1 to S3 functioning as Helmholtz resonators through the slits S1 to S3. That is, when sound waves near the resonance frequency are incident, the air in the slits S1 to S3 vibrates vigorously (for example, the air in the hollow portion 30A acts as a spring against the compression / expansion of the air in the slit S1). Then, sound absorption due to friction loss occurs (the sound is absorbed by converting the incident sound from acoustic energy to heat energy).

  Here, it is possible to set which frequency band of the incident sound T between the longitudinal rails 30 and 30 is mainly lost according to the specifications of the Helmholtz resonator (see the above formula).

  In this embodiment, as shown to Fig.6 (a), since the volume of the hollow parts 30A-30C provided in the vertical beam 30 each differs, as shown to FIG.6 (b), the vertical beam 30 is shown. , 30 is incident to the hollow portions 30A to 30C to cause an impedance change to reflect the sound in a predetermined frequency range, and functions as a Helmholtz resonator through the slits S1 to S3. Sound is absorbed by the friction loss of the slits S1 to S3.

  Therefore, the ratio of the incident sound T passing between the vertical rails 30 and 30 is reduced by these three synergistic effects.

  According to the fence F of the present embodiment described above, air permeability and daylighting can be ensured between the vertical rails 30 and 30 (including between the vertical rail 30 and the column 10). Due to the two synergistic effects, the ratio of the incident sound passing between the vertical rails 30 and 30 is reduced, and the soundproofing property is excellent.

Further, the vertical beam 30 is configured by combining three shape members (first to third shape members 31 to 33) extending in the longitudinal direction, and the slits S1 to S3 are opposed to the combined shape members. Since it forms by the part, when combining the shape material and comprising the fence F, slit S1-S3 can be formed together. Therefore, it is not necessary to separately form the slits S1 to S3, and the manufacturing process of the vertical rail 30 is simplified.
Further, even when a plurality of hollow portions 30 </ b> A to 30 </ b> C are formed in the vertical beam 30, it can be easily formed by a combination of the first shape member 31 to the third shape member 33.

  Moreover, since the vertical beam 30 is made of an extruded shape made of an aluminum alloy, the vertical beam 30 can be easily manufactured. In addition, an extruded shape made of an aluminum alloy has high dimensional accuracy and is lightweight while having strength. Therefore, a soundproof structure that acts as a desired Helmholtz resonator can be manufactured with high accuracy. The same effect can be obtained when the vertical beam 30 is formed of a resin extruded profile.

  Further, since no sound absorbing material is required, there is no performance deterioration due to secular change and the structure is simple. Therefore, waste can be reduced at the time of disposal, and the recyclability is excellent.

(Second Embodiment)
The fence F1 as the soundproof structure according to the present embodiment is different from the first embodiment in that horizontal rails 20A, 20A are attached to the upper and lower sides of the rear surfaces of the columns 10, 10, as shown in FIG. A plurality of vertical bars 30 are attached to the rear surfaces of these horizontal bars 20A and 20A.

As shown in FIG. 8, the horizontal rail 20 </ b> A is configured by combining a base member 28 and a cover member 29.
The base member 28 has a bottom portion 280 and upper and lower side walls 281 and 282 continuous with the bottom portion 280, and is formed in a substantially U shape in a side view.
As shown in FIG. 7A, a plurality of insertion holes 27a are formed in the bottom portion 280 at predetermined intervals in the left-right direction. The formation position of each insertion hole 27a corresponds to the attachment position of the vertical beam 30, and a fixing screw 27b for fixing the vertical beam 30 can be inserted into each insertion hole 27a. The base member 28 is fixed to the front portion 311 of the vertical beam 30 by screwing the fixing screws 27b inserted into the insertion holes 27a into the vertical beam 30 respectively.
In the present embodiment, a total of six vertical bars 30 are fixed to the horizontal bars 20A and 20A, and the leftmost vertical beam 30 and the rightmost vertical beam 30 are behind the columns 10 and 10 when viewed from the front. Are located in a state in which almost the whole is hidden. As shown in FIG. 7A, the left end passage R1 and the right end passage R5 are formed between the vertical rails 30 and 30 (one side is connected to the left side wall or the right side wall of the column 10). Therefore, the ratio of incident sound passing through the passages R1 and R5 can be effectively reduced. Further, the vertical beam 30 attached by the horizontal beam 20A between the adjacent column 10 can be arranged on the left side of the vertical beam 30 on the left end and on the further right side of the vertical beam 30 on the right end. The vertical bars 30 can be continuously arranged without being sandwiched between them.

  As shown in FIG. 8, engaging protrusions 281a and 282a are formed at the distal ends of the side walls 281 and 282 of the base member 28 so as to bulge outwardly in a square shape. The engagement protrusions 281a and 282a are opposed to the engagement protrusions 281a and 282a, and the engagement receiving portions 291a and 291a provided on the upper and lower side walls 291 and 292 are continuous with the bottom 290 of the cover member 29. 292a is engaged.

The cover member 29 has a bottom portion 290 and front and rear side walls 291 and 292 that are continuous with the bottom portion 290, and is formed in a substantially U shape in a side view that can be attached to the base member 28.
Engagement receiving portions 291a and 292a projecting in a mountain shape toward the side walls 281 and 282 of the base member 28 are formed on the inner ends of the front and rear side walls 291 and 292 of the cover member 29, respectively. The engagement receiving portions 291a and 292a can be engaged with the engagement protrusions 281a and 282a of the side walls 281 and 282 of the base member 28, and the cover member 29 is attached to the base member 28 by this engagement. It has become. The cover member 29 may be fixed to the base member 28 using an adhesive or a bolt (not shown).
The cover member 29 is formed with a length that covers the base member 28 between the support columns 10 and 10. Spaces SP through which the brackets 26 and 26 are passed are respectively formed on the side of the left end portion and the side of the right end portion of the cover member 29 (see FIG. 7B).

  As shown in FIG. 7A, such horizontal rails 20A and 20A are respectively fixed to the columns 10 and 10 via brackets 26 that are substantially L-shaped in plan view. One end side of the bracket 26 is fixed to the bottom portion 280 of the base member 28 of the horizontal rail 20A via a fixing screw 26b, and the other end side is fixed to the right side wall and the left side wall of the column 10 via the fixing screw 26b. . In addition, you may make it fix using the volt | bolt and nut which are not illustrated irrespective of the fixing screw 26b.

  According to the fence F1 of this embodiment, since the vertical beam 30 can be continuously arranged in the left-right direction as compared with the fence F of the first embodiment, the ratio of incident sound passing between the vertical beams 30 and 30 Can be further reduced, and effective soundproofing can be realized.

Next, a modified example of the vertical rail 30 will be described.
First, in the example shown in FIG. 9A, the third beam 33 of the vertical beam 30 is arranged in the vertical direction opposite to the arrangement described in the first and second embodiments. The hollow portion 30B having the smallest volume is disposed on the front side of the vertical rail 30 and the hollow portion 30A having a volume larger than that is disposed on the rear side of the vertical rail 30. In FIG. 9, the bolt insertion hole 301 is omitted.

  In the example shown in FIG. 9B, the vertical beam 30 having the hollow portion 30B disposed on the front side and the vertical beam 30 having the hollow portion 30A disposed on the front side are alternately arranged in the left-right direction. .

  Furthermore, in the example illustrated in FIG. 9C, the vertical bars 30 are arranged so that the slits S <b> 1 to S <b> 3 of the corresponding hollow portions 30 </ b> A to 30 </ b> C face each other. Is.

Even with such a configuration, the ratio of incident sound passing between the vertical rails 30 and 30 is reduced, and effective soundproofing can be realized.
In the example shown in FIG. 9C, the opening width L3 between the vertical rails 30 and 30 is wider than the opening width L2 (see FIG. 6B) through the slits S1 to S3 facing each other. Can be. As a result, a more drastic change in the opening width can be caused, and an impedance (acoustic resistance) change can be suitably caused to appropriately reflect the incident sound.

Next, the example shown in FIG. 10 will be described.
As shown in FIG. 10 (a), the vertical rail 300A is a cylindrical member having a rectangular outer shape in plan view as in the first and second embodiments described above, and is an extruded shape made of aluminum alloy. Become. As shown in FIG. 10 (b), the vertical beam 300A is configured as a joined product combining the first profile 31A, the second profile 32A, and the third profile 33A. Two hollow portions 30A and 30C penetrating in the vertical direction (extrusion direction) are provided inside. The upper end and the lower end of the vertical beam 300A are open, and the upper end is in contact with the lower surface (the lower surface of the bottom portion 210) of the upper horizontal beam 20 (see FIG. 2), as in the example shown in the first embodiment. The lower end is in contact with the upper surface (the upper surface of the bottom portion 210) of the lower horizontal rail 20 (see FIG. 2). As shown in FIG. 10C, the vertical beam 300A can be fixed to the base member 28 of the horizontal beam 20A with the fixing screw 27b in the same manner as the example shown in the second embodiment.

  The first shape member 31A and the second shape member 32A constituting the longitudinal beam 300A have the same shape, and the first shape member 31A is changed in direction before and after the third shape member 33A. The arranged one is the second shape member 32A. Thereby, the first profile 31A and the second profile 32A can be obtained by appropriately cutting one profile into lengths.

As shown in FIG. 10B, the first shape member 31A includes a front portion 311A, a short side portion 312A continuous to the left side of the front portion 311A, and a long side portion 313A continuous to the right side of the front portion 311A. And. In the present embodiment, the length of the long side portion 313A is longer than that of the short side portion 312A.
In the following description, the front portion 311A of the first shape member 31A, the rear end portion 312a of the short side portion 312A, and the rear end portion 313a of the long side portion 313A are respectively rear portions of the second shape member 32A. 311A ′, front end 312a ′ and front end 313a ′.

As shown in FIG. 10 (a), the rear end 312a of the short side 312A in the first profile 31A is opposed to the front end 313a 'of the long side 313A of the second profile 32A. Then, a slit S1 is formed between the front end portion 313a ′. Further, the rear end portion 313a of the long side portion 313A in the first shape member 31A is opposed to the front end portion 312a ′ of the second shape member 32A with a space therebetween, and the slit S3 is formed between the front end portion 312a ′. Form.
These two slits S1, S3 form an introduction part of a resonator constituted by the hollow portions 30A, 30C, and communicate between the hollow portions 30A, 30C and the outside.
The slits S1 and S3 are open in the vertical direction (extrusion direction) of the vertical beam 300A, and the hollow portions 30A and 30C pass through the slits S1 and S3 along the vertical direction of the vertical beam 300A (R1). To R5, see FIGS. 3A and 3B).

The third cross section 33A functions as a connecting member that connects the first cross section 31A and the second cross section 32A, and serves as a partition wall that partitions the inside of the vertical rail 300A into the hollow portions 30A and 30C. It also has functions.
The third shape member 33A is formed continuously from the straight portion 331c, the bent portion 331d formed at the front and rear ends of the straight portion 331c, and the bent portions 331d and 331d at the front and rear ends, respectively. There are engagement pieces 331a and 331b that can be engaged with the engagement groove 314 of the material 31A and the engagement groove 314 of the second shape member 32A, respectively.
Here, the straight portion 331c is displaced in the left-right direction (here, leftward) from the central portion of the vertical rail 300A via the bent portions 311d and 311d, as shown in FIG. The volume of the hollow part 30A is smaller than the volume of the hollow part 30C.

  In addition, slits S1 and S3 having a predetermined interval in the longitudinal direction of the longitudinal rail 300A are formed in a state where the first profile 31A and the second profile 32A are connected via the third profile 33A. As described above, the dimensions of the respective parts of the first shape member 31A to the third shape member 33A are adjusted.

  Such a longitudinal beam 300A slides the engagement piece 331a (331b) of the third profile 33A from the vertical direction in the engagement groove 314 formed in the first profile 31A and the second profile 32A. It is possible to assemble by engaging each other. As a result of the assembly, a slit S1 is formed between the rear end 312a of the first profile 31A and the front end 313a ′ of the second profile 32A, and the rear end 313a of the first profile 31A and A slit S3 is formed between the front end portion 312a ′ of the second shape member 32A.

Note that the first profile 31A and the second profile 32A may be assembled to the third profile 33A in a state where the third profile 33A is rotated 180 degrees in the horizontal direction. By doing in this way, since the straight part 331c of the 3rd shape member 33A will be displaced to the right direction rather than the center part of 300 A of vertical bars via bending part 311d, 311d, 30A of hollow parts Can be made larger than the volume of the hollow portion 30C.
Alternatively, the first shape member 31A may be changed in direction so that the long side portion 313A is positioned on the left side of the front portion 311A (the short side portion 312A is positioned on the right side). In this case, the second shape member 32A can also be assembled by changing the direction corresponding to the first shape member 31A.

  By using the vertical beam 300A as described above, air permeability and lighting can be ensured as described above, and the ratio of incident sound passing between the vertical beams 300A and 300A can be reduced and effective. Sound insulation can be achieved.

Further, the vertical beam 300A is configured by combining three shape members (first to third shape members 31A to 33A) extending in the longitudinal direction, and the slits S1 and S3 are opposed to the combined shape members. The slits S1 and S3 can be formed together when combining the shape members. Therefore, it is not necessary to separately form the slits S1 and S3, and the manufacturing process of the vertical rail 300A is simplified.
Further, even when the two hollow portions 30A and 30C are formed in the vertical beam 300A, it can be easily formed by a combination of the first shape member 31A and the third shape member 33A.

  Further, since the vertical beam 300A is made of an extruded shape made of an aluminum alloy, the vertical beam 300A can be easily manufactured. In addition, an extruded shape made of an aluminum alloy has high dimensional accuracy and is lightweight while having strength. Therefore, a soundproof structure that acts as a desired Helmholtz resonator can be manufactured with high accuracy. The same effect can be obtained when the vertical beam 300A is formed of a resin extruded profile.

A vertical beam 300a shown in FIG. 11 is a modified example of the vertical beam 300A described above, and the lengths of the bent portions 311d ′ and 311d ′ continuous to the straight line portion 331c are set to the above-described bent portions 311d and 311d, respectively. It is formed shorter than 311d.
By using the third shape member 33A ′ having such bent portions 311d ′ and 311d ′, the volume ratio of the hollow portions 30A and 30C can be changed.
In this case as well, the third shape member 33A ′ can be rotated 180 degrees in the horizontal direction and assembled so that the straight line portion 331c is displaced to the right from the center portion.
Alternatively, the first shape member 31A may be changed in direction so that the long side portion 313A is positioned on the left side of the front portion 311A (the short side portion 312A is positioned on the right side). In this case, the second shape member 32A can also be assembled by changing the direction corresponding to the first shape member 31A.

FIG. 12 shows an arrangement example using the vertical rail 300A. In this example, the vertical beam 300A ″ and the vertical beam 300a ′ are alternately arranged.
The vertical beam 300A ″ is assembled such that the long side portion 313A is positioned on the left side of the front portion 311A in the first shape member 31A, and the second shape member 32A is assembled so as to correspond thereto. is there. In such a vertical rail 300A ″, the volume of the hollow portion 30A is larger than the volume of the hollow portion 30C.
The vertical rail 300a ′ is assembled such that the straight portion 331c is displaced to the right of the center portion and the long side portion 313A is positioned on the left side of the front portion 311A in the first shape member 31A, and this is supported. Thus, the second shape member 32A is assembled.

In this way, the different vertical bars 300A ″ and the vertical bars 300a ′ are alternately arranged, so that the specifications of the volume of the hollow portions 30A and 30C and the size of the opening width L2 can be made different. In addition, a change in impedance (acoustic resistance) can be preferably generated to appropriately reflect a sound in a desired frequency range, and a sound in a desired frequency range can be lost by a Helmholtz resonator.
In addition, by appropriately setting the size of the stepped portions 331d and 331d ′, the displacement direction (the direction of the third shape member 33A), and the directions of the first and second shape members 31A and 32A, a desired frequency range can be obtained. Sound absorption corresponding to sound can be realized.

  In the example shown in FIG. 13A, a connecting portion 332B that functions as a partition wall is orthogonal to the base portion 331B of the third shape member 33B that constitutes the vertical rail 300B. This third shape The vertical bar 300B is partitioned into four hollow portions 30A to 30D by the material 33B.

By having the four hollow portions 30A to 30D having different volumes as described above, it is possible to suitably cause a change in impedance (acoustic resistance) and to appropriately reflect a sound in a desired frequency range, and to use a Helmholtz resonator. Sound in a desired frequency range can be lost.
Also in this case, it is possible to suitably absorb sound in a desired frequency range by appropriately setting the displacement amount and displacement direction of the base portion 331B.

Further, for example, as shown in FIG. 13B, the third beam 33B of the vertical beam 300B ′ is disposed so that the vertical beam 300B shown in FIG. The hollow portion 30B having the smallest volume may be arranged on the front side of 300B ′, and the hollow portion 30A having a volume larger than this may be arranged on the rear side of the vertical rail 300B ′.
This arrangement also reduces the proportion of incident sound that passes between the longitudinal bars 300B and 300B ′, thereby realizing effective soundproofing.

In the example shown in FIG. 14A, the longitudinal beam 300C is integrally formed with one extruded shape member, and the slit S1 is integrally formed at the time of extrusion molding.
By using such a vertical beam 300C, the configuration becomes simple and productivity is improved.
In addition, as shown in FIG.14 (b), you may arrange | position the slit S1 facing the vertical beam 300C between the adjacent vertical beams 300C.

  Next, in the example shown in FIG. 15A, a partition wall 37 is provided inside the vertical rail 300 </ b> F to partition it left and right, and a hollow portion 30 </ b> A is formed on the left side across the partition wall 37. A hollow portion 30C is formed on the right side. The partition wall 37 is provided such that the partition position is shifted in the left-right direction (here, leftward) from the center portion, and is set so that the volume of the left hollow portion 30A is smaller than the volume of the right hollow portion 30C. Yes. Such a vertical beam 300F can be integrally formed with one extruded profile.

Although the slits S1 and S3 are arranged to face each other, as shown in FIG. 15B, the slits S1 and S3 may be arranged so as not to face each other by shifting their positions in the front-rear direction.
Further, as shown in FIG. 15C, the vertical bars 300C and the vertical bars 300F may be alternately arranged in the left-right direction.

  Even with the configuration using the vertical beam 300F as described above, a change in impedance (acoustic resistance) can be suitably generated to appropriately reflect a sound in a desired frequency range, and a desired frequency range can be obtained by a Helmholtz resonator. Can be lost, and the ratio of incident sound passing between the vertical bars 300F and 300F (between the vertical bars 300F and 300C) is reduced, and effective soundproofing can be realized.

  Further, as shown in FIG. 16 (a), the vertical beam 300Q may be provided so as to have a slit S7 bent in a substantially letter shape in plan view, and as shown in FIG. 16 (b), The side portions 312 ′ and 313 ′ may be formed so that the passage R has a substantially square shape in plan view between the adjacent vertical bars 300 R and 300 R.

Further, as shown in FIG. 16C, the cross sections of the adjacent facing surfaces 312B and 313B may include a curved line.
By comprising in this way, it becomes possible to reduce the whistling phenomenon produced by the air which passes between the vertical rails 300S and 300S.
In addition, as shown in FIG.16 (d), you may comprise the vertical rail 300T so that the cross section of adjacent opposing surface 312C, 313C may include a curve with smaller radius.
With this configuration, the whistling phenomenon can be further reduced.

Next, examples of the present invention will be described.
<Example>
As the fence according to the embodiment, four types of samples (fences F-1 and F-2) in which two Helmholtz resonators having different volumes are alternately arranged on the basis of the vertical rails 300A and 300a shown in FIGS. F-3, F-4) were prepared, and the sound transmission loss was measured under different conditions as described later (acoustic intensity method sound transmission loss test).
<Sample>
(1) As shown in FIG. 17 (a), the fence F-1 is configured by alternately arranging vertical bars 300a ′ and vertical bars 300A ″, and has slits S1 and S3 facing the passages R1 to R3. It is arranged at a non-opposing position. As the sound source, a sound source that emits an incident sound incident leftward with respect to the fence F-1 was used. The vertical beam 300a ′ and the vertical beam 300A ″ have the specifications described in the embodiment.
(2) As shown in FIG. 17 (b), the fence F-2 is configured by alternately arranging the vertical bars 300a '' and the vertical bars 300A, and the slits S1 and S3 facing the passages R1 to R3 are not provided. It is arranged at the facing position. The sound source used was one that emits incident sound that enters the fence F-2 in the right direction. The vertical rail 300a '' is assembled such that the straight portion 331c is displaced to the right of the center portion and the short side portion 312A is positioned on the left side of the front portion 311A in the first profile 31A. The second shape member 32A is assembled so as to correspond to this. The vertical rail 300A has the specifications described in the embodiment.
(3) As shown in FIG. 17 (c), the fence F-3 is configured by alternately arranging the vertical bars 300a ′ and the vertical bars 300A ′, and the slits S1 and S3 facing the passages R1 to R3 are not provided. It is arrange | positioned in the opposing position. The sound source used was one that emits an incident sound that enters the fence F-3 in the left direction. The vertical rail 300A ′ is assembled such that the straight portion 331c is displaced to the right of the center portion and the long side portion 313A is positioned on the left side of the front portion 311A in the first profile 31A. The second shape member 32A is assembled so as to correspond to the above.
(4) As shown in FIG. 17 (d), the fence F-4 is configured by alternately arranging the vertical bars 300a ′ and the vertical bars 300A, and the slits S1 and S3 facing the passages R1 to R3 are opposed to each other. Is arranged. The sound source used was one that emits an incident sound that enters the fence F-4 in the left direction.
In addition, in each fence F-1 to F-4, the distance between adjacent vertical bars was 10 [mm].

<Comparative example>
As a fence according to the comparative example, a fence N-1 was made of a vertical beam made of an extruded shape made of an aluminum alloy having no Helmholtz resonator. In the fence N-1, the distance between adjacent vertical bars was 10 [mm].

<Measurement environment>
Temperature: 28 ° C., humidity: 48%, atmospheric pressure: 1030 hPa.
<Devices used>
Microphone: 4165 (manufactured by B & K Corp.), microphone amplifier: NXUS (manufactured by B & K Corp.), intensity microphone pair: 4178 (manufactured by B & K Corp.), microphone spacer: UC0196 (manufactured by B & K Corp.), Intense City probe: 3545 (B & K Co., Ltd.)
<Test method>
First, each sample was installed in a partition between a reverberation chamber (9.0 m ³ ) and an anechoic chamber (3.7 m ³ ), and the periphery was fixed with clay. Next, the sound source sound pressure level in the reverberation room was measured, and the sound intensity transmitted to the anechoic room side was measured. The sound transmission loss TL [dB] of each sample was calculated by the following calculation formula based on the sound source sound pressure level and the transmitted sound intensity.
TL = Lp-Lw + 10 log S-6 + 10 log (1 + λS1 / 8V1)
Here, Lp: spatial average sound pressure level [dB] in the sound source room, Lw: power level [dB] of transmitted sound, S: sample area [m ² ], λ: wavelength of sound of band center frequency [m], S1: Total surface area [m2] of the sound source room, V1: Volume [m3] of the sound source room.
The results are shown in Table 1 and FIG.

  As shown in Table 1 and FIG. 18, the fences F-1 to F-4 according to the examples have improved sound transmission loss [dB] compared to the fence N-1 of the comparative example, and have air permeability and lighting. It was possible to improve the soundproofing function (soundproofing function). In particular, a suitable sound insulation function was exhibited in a wide frequency band from around 630 Hz to 3150 Hz.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the summary of this invention. For example, as shown in FIG. 19, the vertical rail 300U may be configured so that four or more hollow portions 30A to 30D and 30E to 30H are connected in the front-rear direction. Also in this case, it is possible to configure the vertical beam 300U by combining and joining a plurality of shape members, and the vertical beam 300U can be configured integrally with one shape material. Also in this case, the impedance (acoustic resistance) change is preferably caused by the change of the passage width by each of the slits S1 to S8, and the desired frequency range is reflected by the Helmholtz resonator. The sound can be suitably prevented by a synergistic effect with the loss of the sound.

  Moreover, although the vertical beam 30 is a rod shape, it may be a plate shape. Moreover, in each embodiment and modification, although the vertical rail 30 (300 etc.) showed what was arrange | positioned between the support | pillars 10 in the vertical direction (vertical direction), it is not restricted to this, A horizontal direction (horizontal) Direction) or a slanting direction.

  Moreover, the vertical beam 30 may be configured by combining two profiles, or may be configured by combining four or more profiles.

10 Column 10a Lid member 20, 20A Horizontal beam 30 Vertical beam (hollow body)
30A-30H Hollow part 31, 31A 1st profile 32, 32A 2nd profile 33, 33A, 33B 3rd profile 300A-300D Vertical beam (hollow body)
300F Vertical beam (hollow body)
300H to 300N Vertical beam (hollow body)
300P to 300U Vertical beam (hollow body)
300a Vertical beam (hollow body)
311 front (reflective surface)
360 Sound-absorbing material 361 Sound-absorbing material 363 Sound-absorbing material 410 Sound-absorbing plate F, F1 Fence S1-S3 Slit S5-S7 Slit T Incident sound

Claims (5)

A soundproof structure in which a plurality of hollow bodies are arranged side by side at intervals,
The plurality of hollow bodies are:
It has a reflecting surface that reflects incident sound on the side on which sound is incident, and has a hollow portion that functions as a Helmholtz resonator,
The soundproof structure, wherein the hollow body is provided with a slit-like opening extending in the longitudinal direction in communication with the hollow portion on a surface facing the adjacent hollow body.   The said hollow body is comprised combining the 2 or more shape member extended in the axial direction of the said hollow body, The said opening part is formed of the opposing part of the said shape members, It is characterized by the above-mentioned. The soundproof structure according to 1.   The soundproof structure according to claim 1 or 2, wherein the hollow body is made of an extruded shape made of aluminum alloy or resin.   The soundproof structure according to any one of claims 1 to 3, wherein a sound absorbing material is disposed in the hollow portion.   The soundproof structure according to any one of claims 1 to 4, wherein the opposing surface of the adjacent hollow bodies has a cross section including a curve.

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