JP2002004467A - Double wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double wall having excellent sound isolating property and sound absorbing property (soundproofing) in a low-frequency range, particularly in the low-frequency range of 100 Hz or below. SOLUTION: At least a pair of columns 11 and 12 and a stud 21 are used as support materials in this double wall. A plate 3 of a single layer or multiple layers are stuck to a pair of columns 11 and 12 and the stud 21 to form one face of the wall on the same side face side P1 of the support materials, and a plate of a single layer or multiple layers preferably having a metal plate is stuck to form another face of the wall on the opposite side face side P2 of the support materials so that the plate 4 is fixed to a pair of column 11 and 12 and is kept in no contact with the stud 21. A fibered porous material having the bulk density of 10-48 kg/m3 is preferably inserted between the plate 3 and the plate 4 to form this double wall having excellent soundproofing in a low-frequency range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double window having a double structure of a double wall used for a building wall, a roof and the like, and a glass material such as a glass plate (hereinafter referred to as a double window including a double window). Heavy wall), and particularly to a double wall excellent in soundproofing performance.

[0002]

2. Description of the Related Art According to a construction example published in "Building Technology Supplement vol.1 No.449 88-89 (88 ')" as a sound insulation construction example of a wooden house outer wall, the same side of pillars and studs is used. Outer wall material,
By laminating a laminate of asphalt felt and plywood to form one surface of the wall, on the opposite side of these supports, paste a gypsum board and adopt an outer wall structure with glass wool interposed inside, The sound insulation performance of the inside and outside sound pressure level difference: 40dB (500Hz) is obtained.

On the other hand, the sound insulation performance varies depending on the frequency. In the case of the above-described outer wall structure, it has been shown that the difference between the inside and outside sound pressure levels is reduced to about 20 dB at 125 Hz. Estimating from the relationship between the above frequency and the difference between the internal and external sound pressure levels,
In the case of the above-mentioned outer wall structure, it is considered that the difference between the inside and outside sound pressure levels is remarkably reduced at a frequency of 100 Hz or less, but its performance value is not shown.

[0004] As described above, while there is a need for soundproofing in a low-frequency sound range of 100 Hz or less, at present, there is little research on soundproofing.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and provides sound insulation and sound absorption in a low frequency range (hereinafter also referred to as a low frequency range), particularly in a low frequency range of 100 Hz or less. It is an object to provide a double wall excellent in (hereinafter also referred to as soundproofing).

[0006]

One of the reasons that the research on soundproofing in the low frequency range was scarcely made was as follows.
Measurement methods capable of simply and accurately measuring soundproofing performance in a low frequency range have not been established. The present invention has been triggered by the establishment of a measuring device capable of simply and accurately measuring soundproofing performance in a low frequency range.

That is, the present inventors have recognized the importance of measuring soundproofing performance in a low frequency range, and as a result of diligent studies, have found that the soundproofing performance of a building material sample can be appropriately evaluated as described in the examples below. Provided a tube (JP-A-2000-121427)
No.). The present inventors use the above-described measuring device (acoustic tube)
As a result of intensive experiments and investigations using, various findings regarding soundproofing in a low frequency range were obtained, and the present invention was reached.

That is, the present invention provides at least one pair of pillars.
1 _1, 1 ₂ and the studs 2 ₁ a double wall to support, in the same side surface P ₁ of the support material, posts 1 ₁ of the plate 3 of a single layer or multiple layers the pair, 1 ₂ and adhered to studs 2 ₁ forms one side of the wall, in the opposite side surface P ₂ of these support materials, the sheet 4 of a single layer or multiple layer, the pillar 1 of the plate member 4 is the pair _1, 1 is the stud 2 ₁ is fixed to ₂ is double-walled with excellent sound insulation in a low frequency range, characterized in that the formation of the other surface of wall paste to avoid contact.

In the above-mentioned present invention, it is preferable that the plate member 4 has a single-layer or multi-layer metal plate (a first preferred embodiment of the present invention). In the first preferred embodiment of the present invention described above, the metal plate is preferably a zinc-based plated steel sheet (a second preferred embodiment of the present invention). Further, in the present invention, the first preferred embodiment and the second preferred embodiment of the present invention, it is preferable that the plate member 3 is formed of a laminate of plywood and a ceramic roofing material (the third embodiment of the present invention). Preferred Embodiment to Fifth Preferred Embodiment).

In the above-mentioned first and fifth preferred embodiments of the present invention, the fibrous porous material having a bulk density of 10 to 48 kg / m ³ between the plate material 3 and the plate material 4 is provided. It is preferable to interpose a porous material having a bulk density of 12 to 48 kg / m ³ (preferably the sixth preferred embodiment of the present invention).
Eleventh preferred embodiment). In the above-described present invention,
It is preferable that both the plate members 3 and 4 are glass plates (a twelfth preferred embodiment of the present invention).

[0011] The present invention described above, the stud 2 ₁ in the first preferred embodiment to twelfth preferred embodiment of the present invention is not limited to the so-called studs (stud) in the building sector, the shows a pillar in general to be disposed between the pillar 1 ₁ and the bar 1 _2.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. As described above, the present inventors have conducted various experiments and studies using the measuring device (acoustic tube) developed by the present inventors, and as a result, obtained various knowledge on soundproofing in a low frequency range, and reached the present invention. Was.

That is, as a result of experimentally investigating the sound transmission loss (hereinafter also referred to as transmission loss) of a plate-like material in detail using the above-described sound tube, the change in the transmission loss due to the change in frequency is as follows. there were. That is, if the frequency is 100
It is observed that the transmission loss gradually decreases as the frequency decreases from Hz, and then the transmission loss shows a minimum value at a frequency specific to the material, and then the transmission loss gradually increases as the frequency further decreases. Was observed.

The above phenomenon cannot be avoided because it is a physical property of the material. However, when viewed as a soundproofing material in a low frequency range, the minimum value of the transmission loss may be several dB, and the soundproofing property may be reduced. From the viewpoint, it is necessary to solve the above-mentioned restrictions due to the physical properties of the material. Then, the present inventors further investigated the soundproof performance of various materials and wall structures, and found the following findings (1) and (2).

(1) As the areal density of the material increases, the frequency at which the transmission loss has a minimum value decreases. (2) As the rigidity of the material increases, the frequency at which the transmission loss shows a minimum value increases, and the minimum value also increases. However, it was clear that it was difficult to obtain sufficient soundproofing performance only by selecting the material.

The present inventors have conducted various studies based on the above findings obtained from experiments. As a result, the adoption of the wall structure of the present invention provides a wall structure having excellent soundproofing performance in a low frequency range. It was found through experiments that this was possible, and the present invention was completed. The basis of the present invention is to improve the soundproofing performance as a whole by combining materials having different frequencies showing the minimum value of the sound transmission loss (: transmission loss), thereby compensating for the disadvantages of each material.

As a material having a difference in the frequency showing the minimum value of the transmission loss, it is necessary to combine walls having different support intervals of the plate material. FIG. 1 shows an example of the double wall of the present invention by a horizontal sectional view. In FIG. 1,
1 ₁ , 1 ₂ , 1 ₃ are columns, 2 ₁ , 2 ₂ are studs, 3 and 4 are plate materials, P ₁ is columns
1 ₁ , 1 ₂ , 1 ₃ , studs 2 ₁ , 2 ₂ on the same side of the support, P ₂
Shows a column 1 _1, 1 _2, 1 _3, studs 2 _1, 2 ₂ and is opposite the side of the support member.

[0018] That is, as illustrated in Figure 1, in the present invention, at least one pair of posts 1 _1, 1 ₂ and studs 2 ₁
In double wall to support the at the same side surface P ₁ of the support material, affixed to plate 3 of a single layer or multiple layers in column 1 _1, 1 ₂ and studs 2 ₁ of said pair wall one side is formed of, in the opposite side surface P ₂ of these support materials, the sheet 4 of a single layer or multiple layer, the pillar 1 ₁ of the plate member 4 is the pair 1 ₂ fixation (: fixed) to the studs 2 ₁ has a structure that forms the other surface of wall paste to avoid contact.

In the double wall of the present invention, it has been found that a wall surface having a wide support interval between the surfaces is excellent in sound absorption in a low frequency range. In addition, as a modified example of the above-described double wall, when sufficient soundproofing performance can be obtained only by changing the support interval between the plate members 3 and 4, the plate member 4 can be reinforced with a bar-shaped member.

In the present invention, when it is not sufficient to just change the supporting interval depending on the type of the plate, it is preferable to further change the surface density of the plate. In this case, it is advantageous to further increase the surface density put a metal plate on the opposite side surface side P ₂ rigidity of the support spacing is wide wall is small as shown in FIG. As the metal plate, a single-layer or multi-layer metal plate can be used, and the metal plate is not particularly limited, but it is preferable to use a lead plate, a zinc-plated steel plate, and further use a zinc-plated steel plate Is more preferable.

This is because the use of a lead plate has the effect of lowering the frequency at which the transmission loss has a minimum value, and the use of a galvanized steel sheet has the effect of improving corrosion resistance in addition to the above-mentioned effects. It is also because it is economical. As the zinc-based coated steel sheet, a zinc-coated steel sheet, a Zn-Ni-plated steel sheet, a Zn-Al-plated steel sheet, or the like can be used.

When the plate 4 is made of a metal plate,
By damping the vibration of the metal plate, the soundproof performance is further improved. For this reason, it is advantageous to further laminate a fibrous porous material such as rock wool or glass wool, a gypsum board or a rubber sheet on the metal plate. In the present invention, the pillar 1 of the _one-to-one, 1 ₂ and studs
The plate 3 double layer adhered to 2 ₁ to form the one side wall, it is preferable to use a plate material made of a laminate of a plywood and ceramic-based roofing materials.

This has the effect of being able to be used as an outer wall by using a plate made of a laminate of a plywood and a ceramic roofing material as the plate 3.
This is because the rigidity of the ceramic roofing material, which is less rigid than a metal plate, can be reinforced by plywood and studs. further,
In the case where a plate made of a metal plate is used as the plate 4,
As the facing plate member 3, it is preferable to use a plate member made of a laminate of plywood and a ceramic roofing material.

This is because, by using a plate made of a metal plate as the plate 4 and using a plate made of a laminate of a plywood and a ceramic roofing material as the opposing plate 3, both effects described above are combined. It is because it is obtained.
As the above-mentioned ceramic roofing material, asbestos slate flat plate, colonial roofing material and the like are exemplified.

In any of the above-mentioned double walls, it is more preferable to interpose a fibrous porous material such as glass wool or rock wool between the plate material 3 and the plate material 4 in order to enhance the soundproofing performance. . As the above-mentioned fibrous porous material, a fibrous porous material having a bulk density of 10 to 48 kg / m ³ is preferable, and a fibrous porous material having a bulk density of 12 to 48 kg / m ³ is more preferable. It is.

This is because the bulk density of the fibrous porous material is 10 kg / m
If it is less than ^3, the minimum value of the transmission loss as a whole becomes small, and if it exceeds 48 kg / m ³ , the minimum value of the transmission loss as a whole becomes small. As the double wall of the present invention, a double wall using a glass plate as the plate member 3 and the plate member 4 is also preferable.

This is because the double wall makes it possible to provide a window having an excellent soundproofing effect. Although the present invention has been described above, the double wall of the present invention can be very suitably used as a soundproof wall in a low frequency range.

[0028]

EXAMPLES The present invention will be described below more specifically based on examples. In this example, an experiment was conducted using the sound transmission loss measuring device developed by the present inventors shown in FIG. First, the sound transmission loss measuring device and the double-wall test method shown in FIG. 2 will be described.

(Sound Transmission Loss Measuring Apparatus) FIG. 2A is a horizontal sectional view of the sound transmission loss measuring apparatus, and FIG. 2B is a side sectional view of the sound transmission loss measuring apparatus. In FIG. 2, 10 is an acoustic tube, 11 is a tube, 11a is one end of the tube 11, 12
Denotes a speaker, 13 denotes a building material sample, 14a to 14d a microphone, 15 denotes a calculation device, 15a denotes a sound pressure reflection coefficient calculation unit, 15b denotes a transmission loss calculation unit, 16 denotes a sound absorbing material, and 17 denotes a display device.

In the sound transmission loss measuring device shown in FIG. 2, a tube 11 having a rectangular inside cross section with one end 11a of the tube 11 closed.
A speaker 12 as a sound source is attached to the other end of the tube 11, and a building material sample 13 is placed in the center of the tube 11.
In the tube 11, two microphone mounting holes are opened on the upstream side (speaker 12 side) with respect to the installation position of the building material sample 13, and two microphone mounting holes are also opened on the downstream side. Microphones 14a to 14d are inserted into the four microphone mounting holes, respectively.

Each of the microphones 14a to 14d can supply a sound pressure signal to the arithmetic unit 15. Further, a sound absorbing material 16 made of glass wool or the like is arranged on one end 11a side of the tube 11 in the tube 11, between the one end 11a of the tube 11 and the installation position of the building material sample 13 in the tube 11. Have been.

As shown in FIG. 2, the sound absorbing material 16 is formed such that the building material sample side is cut into an isosceles triangular shape with its vertex facing the one end 11a side of the tubular body 11 in plan view. Thus, a pair of left and right symmetrical wedges with the pointed portion facing the building material sample 13 side are configured. The arithmetic unit 15 includes a sound pressure reflection coefficient arithmetic unit 15a and a transmission loss arithmetic unit 15b.

The sound pressure reflection coefficient calculating section 15a receives sound pressure signals from the two microphones 14a and 14b on the upstream side, performs a fast Fourier transform (FFT) on the input signals, and obtains a transfer function. .Acoust.Soc.Am.68 (3), Sept.1980, pp.9
The sound pressure reflection coefficient R ₁ on the upstream side is obtained by a known calculation method as described in “07-913”. Similarly,
Two microphones 14c on the downstream side, based on the sound pressure signal from 14d, determine the sound pressure reflection coefficient R ₂ of the downstream side.

The transmission loss calculating unit 15b, two microphones 14b sandwiching the building material sample 13, both the microphone 14b is subjected to fast Fourier transform on the sound pressure signal from 14c, together with obtaining the transfer function H ₁₂ between 14c The two sound pressure reflection coefficients R ₁ and R ₂ are input from the sound pressure reflection coefficient calculation unit 15a, the transmittance is calculated based on the following equation (1), and the sound transmission loss is calculated from the transmittance.

| H ₁₂ · (1 + R ₁ ) / ((1 + R ₂ ) | ² (1) In the above formula (1), H ₁₂ is a distance between the sound pressure measurement positions (microphones) sandwiching the building material sample 13. This is a transfer function between the installation positions, and represents the ratio of the sound pressure at the corresponding frequency of the sound at each position.In the above equation (1), R ₁ and R ₂ are the sound pressure measurement positions (microphone installation positions). And the sound pressure reflection coefficient at the position, and represents the ratio of the sound pressure of the reflected wave to the magnitude of the sound pressure of the incident wave (or transmitted wave) at each position.

The arithmetic unit 15 can transmit the calculated transmission loss value to the display unit 17. According to the acoustic pipe 10 having the above structure, the sound absorbing material 16, the reflected wave from the one end 11a of the tube 11 that approaches zero, the sound pressure reflection coefficient R ₂ measured approaches zero. As a result, the building material sample 13
The measurement error due to the reflection on the surface (a large transmitted wave is measured) is suppressed, and the sound transmission loss of the building material sample 13 closer to the actual value can be measured.

Further, by making the shape of the sound absorbing material 16 into a sound absorbing wedge shape, the reflected wave from the one end 11a of the tube 11 can be effectively suppressed. In other words, by using the acoustic tube 10 shown in FIG. 2, it is easy to cope with frequencies in the low sound range of 125 Hz or less, and in addition to the measurement of the normal incidence sound absorption coefficient, the measurement of the sound transmission loss close to the actual value can be performed. It is possible.

(Test Method for Double Wall: In this embodiment, the following two types of building material samples A and B (double wall) were used as the building material sample 13 in the sound transmission loss measuring apparatus shown in FIG. Experiments. [Building material sample A:] A square wooden frame with a stud attached to the center of the wooden frame and a double wall with plate materials attached to both sides of each of the studs (Comparative example) [Building material sample B:] A double wall in which a plate is attached to one side of the stud and the other side of the square wooden frame (Examples 1 to 5). FIG. 3 shows the arrangement of the square wooden frame in the acoustic tube and the stud in the wooden frame. , Shown in perspective view.

[0039] In FIG. 3, 20 (also referred to as a less crates) square crate, 21 studs in a square crate, P ₁₀ is the same side of the wooden frame 20 and studs 21 (hereinafter, the same side surface P ₁₀
And also referred to), P ₂₀ is the side opposite the side of the wooden frame 20 and studs 21 (hereinafter, referred to as the opposite side surface side P _20), H, W is the inner dimension of the acoustic tube cross-section, w _1, t ₁ is square crate (: Wooden frame), the cross-sectional dimensions of the timber, w ₂ and t ₂ indicate the cross-sectional dimensions of the stud.

That is, the dimension in the cross section is H: 1 m × W: 1 m
Square crates inscribing the acoustic tube 10: Applying a plate material to both the crates 20 and studs 21 in both of the same side surface P ₁₀ and the opposite side surface side P ₂₀ studs 21 (crates) 20 and crates with double walls (comparative example), or paste the plate to both the crates 20 and studs 21 in the same side surface P _10, pasted plate only wooden frame 20 in the opposite side surface side P ₂₀ The sound transmission loss of the double wall (Examples 1 to 5) was measured by the method described above.

(Comparative Example) FIG. 4 shows a double-walled structure used in this comparative example by a cross-sectional view along the line AA in FIG. In FIG. 4, 3 and 4 are plate materials, 20 is a wooden frame,
21 is a stud, 25 is a plywood, 26 is a flexible board (asbestos cement board), 27 is a glass wool, 28 is a gypsum board, and 29 is a nail.

That is, the cross-sectional dimension in FIG. 3: w ₁ =
In the center of a wooden frame 20 made of wood of 50 mm × t ₁ = 105 mm, one stud 21 made of wood having the same cross-sectional dimensions (w ₂ = 50 mm × t ₂ = 105 mm) is erected. the same side side P ₁₀
In: (same side surface P _10), to both of the crate 20 and studs 21, thickness: 9 mm plywood 25 and thickness: the flexible board 26 of 12mm stuck with nails 29.

Further, the bulk density of the wooden frame 20 is 12 kg /
m ^3, by interposing a glass wool 27 having a thickness of 50 mm, the opposite side face P ₂₀ of the crate 20 and studs 21: In (opposite side surface side P _20), to both of the crate 20 and studs 21, having a thickness of 12mm gypsum The board 28 was attached with a nail 29. Next, the sound transmission loss at a frequency of 20 to 100 Hz was measured for the double wall obtained above.

FIG. 5 shows the measurement results. As shown in FIG. 5, the minimum value of the sound transmission loss at a frequency of 20 to 100 Hz of the double wall having the above structure was 12 dB. (Embodiment 1) FIG. 6 shows a sectional view taken along the line AA in FIG. 3 of the double wall structure used in this embodiment.

It should be noted that the reference numerals in FIG.
Indicates the same content as. That is, in the double wall according to the present embodiment, the cross-sectional dimension of the wood of the wooden frame 20 in FIG. 3 is w ₁ = 50 mm × t ₁ = 105 mm, and the cross-sectional dimension of the stud 21 is w ₂ = 50.
and mm × t ₂ = 80mm, both have a stack of the same plywood 25 and the flexible board 26 and Comparative Example was the same side surface side P ₁₀ affixed nails to both the crates 20 and studs 21.

[0046] Further, in the frame of the crate 20, by interposing the same glass wool 27 as used in Comparative Example, the same gypsum board 28 and Comparative Example wood frame 20 on the opposite side surface side P ₂₀ was affixed by a nail 29. In the double wall of the structure described above, the gypsum board 28 does not contact the stud 21 at all. Next, the sound transmission loss at a frequency of 20 to 100 Hz was measured for the double wall obtained above.

As a result, the frequency of the double wall of this embodiment is 20 to
The minimum value of the sound transmission loss at 100 Hz was 17 dB. (Embodiment 2) FIG. 7 shows the structure of the double wall used in this embodiment by a sectional view taken along the line AA in FIG.

In FIG. 7, reference numeral 30 denotes a laminated lead plate, reference numeral 31 denotes rock wool, and other reference numerals denote the same contents as those in FIG. That is, in the double wall according to the present embodiment, three lead plates having a thickness of 0.5 mm are laminated in place of the gypsum board 28 in the first embodiment, and Rock wool 31 having a density of 200 kg / m ³ and a thickness of 25 mm and a plywood 25 having a thickness of 5 mm were sequentially laminated.

Next, the sound transmission loss at a frequency of 20 to 100 Hz was measured for the double wall obtained above. As a result, the minimum value of the sound transmission loss at the frequency of 20 to 100 Hz of the double wall of the present example was 25 dB. (Embodiment 3) FIG. 8 shows a sectional view taken along the line AA in FIG. 3 showing the structure of the double wall used in this embodiment.

In FIG. 8, reference numeral 32 denotes a laminated galvanized steel sheet (: laminated galvanized steel sheet), and other reference numerals denote the same contents as in FIG. That is, in the double wall according to the present embodiment, instead of the laminated lead plate 30 in the above-described embodiment 2, a zinc iron plate (: galvanized steel plate) having a thickness of 1.6 mm and a thickness of 0.6 mm is laminated. The gypsum board 28 having a thickness of 12 mm was laminated on the laminated galvanized steel sheet (: laminated galvanized steel sheet) 32.

Next, sound transmission loss at a frequency of 20 to 100 Hz was measured for the double wall obtained above. FIG.
Shows the measurement results. As shown in FIG. 9, the minimum value of the sound transmission loss at a frequency of 20 to 100 Hz of the double wall having the above structure was 25 dB.

(Embodiment 4) FIG. 10 shows a double-walled structure used in this embodiment in a sectional view taken along the line AA in FIG. In FIG. 10, reference numeral 33 denotes a ceramic roofing material (: Kubota colonial roofing material), and other reference numerals indicate the same contents as in FIG.

That is, in the double wall according to the present embodiment, the cross-sectional dimension of the wood of the wooden frame 20 is defined as w ₁ = 50 mm × t ₁ = 400 m.
m, the cross-sectional dimension of the stud 21 is set to w ₂ = 50 mm × t ₂ = 100 mm,
In Example 3, a ceramic roofing material 33 having a thickness of 5 mm was stuck instead of the flexible board 26, and the distance between the plywood 25 and the galvanized steel sheet (the laminated galvanized steel sheet 32) was set to 400 mm.

Next, the sound transmission loss at a frequency of 20 to 100 Hz was measured for the double wall obtained above. As a result, the minimum value of the sound transmission loss at the frequency of 20 to 100 Hz of the double wall of the present example was 25 dB. (Embodiment 5) FIG. 11 shows a sectional view taken along the line AA in FIG. 3 showing the structure of the double wall used in this embodiment.

[0055] In FIG. 11, 34 _1, 34 ₂ denotes a glass plate, and other reference numerals indicate the same contents as FIG. 4 described above. That is, in the double wall in the present embodiment,
The cross-sectional dimension of the wood of the wooden frame 20 is w ₁ = 50 mm × t ₁ = 100 mm, the cross-sectional dimension of the stud 21 is w ₂ = 50 mm × t ₂ = 80 mm, and the thickness is 12
In the same side surface side P ₁₀ a glass plate 34 ₁ mm is brought into contact with both the crates 20 and studs 21, crates 20 the glass plate 34 ₁
And wood (not shown)
Thickness: a glass plate 34 ₂ of 8mm in contact only wooden frame 20 on the opposite side surface side P _20, and fixed so as to be sandwiched between the timber (not shown) with the wooden frame 20.

Next, with respect to the double wall obtained above, the sound transmission loss at a frequency of 20 to 100 Hz was measured. As a result, the minimum value of the sound transmission loss at the frequency of 20 to 100 Hz of the double wall of the present example was 20 dB. Table 1 summarizes the experimental results obtained in the above comparative examples and examples.

As shown in Table 1, according to the present invention,
It has become possible to provide a double wall excellent in sound insulation and sound absorption (: soundproofing) in a low frequency range, particularly in a low frequency range of 100 Hz or less.

[0058]

[Table 1]

[0059]

According to the present invention, it is possible to provide a double wall excellent in sound insulation and sound absorption (: soundproofing) in a low frequency range. By applying to a roof or the like, a favorable living environment and living space can be secured.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view showing an example of a double wall according to the present invention.

FIG. 2 is a horizontal sectional view (a) and a side sectional view (b) of the sound transmission loss measuring device.

FIG. 3 is a perspective view showing an arrangement state of a square wooden frame and a stud in an acoustic tube.

FIG. 4 is a side sectional view showing a double wall structure of a comparative example.

FIG. 5 is a graph showing sound transmission loss measurement results of a double wall of a comparative example.

FIG. 6 is a side sectional view showing a structure of a double wall according to the embodiment.

FIG. 7 is a side sectional view showing a structure of a double wall according to the embodiment.

FIG. 8 is a side sectional view showing a structure of a double wall according to the embodiment.

FIG. 9 is a graph showing the results of measuring sound transmission loss of a double wall according to an example.

FIG. 10 is a side sectional view showing the structure of the double wall of the embodiment.

FIG. 11 is a side sectional view showing the structure of a double wall according to the embodiment.

[Explanation of symbols]

1 ₁ , 1 ₂ , 1 ₃ pillars 2 ₁ , 2 ₂ studs 3, 4 plate 10 acoustic tube 11 tube 11 a one end of tube 12 speaker 13 building material sample 14 a to 14 d microphone 15 computing device 15 a sound pressure reflection coefficient computing unit 15 b Transmission loss calculator 16 Sound absorbing material 17 Display device 20 Rectangular wooden frame (: wooden frame) 21 Studs in rectangular wooden frame 25 Plywood 26 Flexible board 27 Glass wool 28 Plaster board 29 Nails 30 Laminated lead plate 31 Rock wool 32 Laminated zinc iron plate ( : Laminated galvanized steel sheet 33 Ceramic roofing material 34 ₁ , 34 ₂ Glass plate H, W Inner dimensions of acoustic tube cross section P ₁ Same side of support material as pillar and stud (: Same side side)
P ₁ ) P ₂ pillar, the opposite side of the support material that is a stud (: the opposite side
P ₂ ) P ₁₀ wooden frame and studs on the same side (: same side P ₁₀ ) P ₂₀ wooden frame and studs on the opposite side (: opposite side P ₂₀ ) w ₁ , t ₁ square wooden frame (: wood sectional dimension w ₂ wood frame), t ₂ cross-sectional dimension of the studs

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiromi Obayashi 1-1-28 Kitahonmachi-dori, Chuo-ku, Kobe City, Hyogo Prefecture Inside Kawasaki Steel Corporation (72) Inventor Itsuro Tanaka 2-chome Uchisaiwaicho, Chiyoda-ku, Tokyo No. 3 Kawasaki Steel Corporation (72) Inventor Toshitan Terada 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo F-term in Kawasaki Steel Corporation (Reference) 2E001 DF02 DF04 DF07 FA03 FA16 FA32 GA12 GA29 GA42 GA43 GA63 HA02 HA11 HA32 HA33 HB02 HB06 HC01 HC02 HE01 MA01 MA11 MA13 2E162 BA05 BB08 CA02 CA03 CA31 CA33 CA35 CB02 CB03 CB12 CC03 CE01

Claims (6)

[Claims] 1. A double wall having at least one pair of columns (1 ₁ , 1 ₂ ) and studs (2 ₁ ) as a supporting material, and a single wall on the same side (P ₁ ) of these supporting materials. Layered or multi-layered board (3)
Are attached to the pair of pillars (1 ₁ , 1 ₂ ) and the studs (2 ₁ ) to form one surface of the wall. On the opposite side (P ₂ ) of these support members, a single layer or a multilayer Plate material (4) was attached to the pair of pillars (1 ₁ , 1 ₂ ) so that the plate material (4) was fixed to the pair of pillars (1 ₁ , 1 ₂ ) and did not contact the stud (2 ₁ ) to form the other surface of the wall. A double wall with excellent soundproofing in the low-frequency range. 2. The double wall according to claim 1, wherein the plate (4) comprises a single-layer or multi-layer metal plate. 3. The double wall according to claim 2, wherein the metal plate is a galvanized steel plate. 4. The double wall according to claim 1, wherein the plate (3) is made of a laminate of plywood and a ceramic roofing material. 5. A fiber-based porous material having a bulk density of 10 to 48 kg / m ³ is interposed between the plate material (3) and the plate material (4). Double wall according to. 6. The double wall according to claim 1, wherein both the plate (3) and the plate (4) are glass plates.