JPS6223095A - Sound insulation structural body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a sound insulation structure having a multi-wall structure with improved sound insulation performance.

(Prior Art) In recent years, in order to deal with problems such as residential noise, research and development of many sound insulation technologies and materials have been carried out.In addition, there is a demand for higher performance of building materials. In order to save resources, save energy, and improve safety, insulation, weight reduction, and non-combustibility are required, and thinning is required to expand space and improve workability.For this reason, sound insulation materials and Sound insulation structures that meet these requirements have come to be required.However, improvements in the sound insulation performance of building materials or buildings, etc. and the above-mentioned performance requirements are often in conflict, and it has been difficult to achieve both. .

In general, the sound insulation performance of sound insulation materials is roughly determined based on the mass agent in sound transmission, and the sound transmission loss (TransmissionLoss), which indicates the sound insulation performance, is determined based on the mass agent in sound transmission.
(hereinafter referred to as T and L) improve as the total areal density increases. Also, T and L on the mass side.

In order to improve the sound insulation effect, it is common practice to create a double wall or multi-wall structure in which sound insulation materials are arranged in parallel, and to further improve the sound insulation effect by inserting sound absorbing materials inside. Construction methods are used, such as laminating a soft sound-insulating surface material over the entire surface of a rigid surface material, or extending a soft sound-insulating surface material over the entire surface of one or more walls of a multi-wall structure.
Improvements in sound insulation have been made (Problems to be Solved by the Invention) However, such methods inevitably result in an increase in weight and thickness. In addition, a particular problem is that even if such a method is used, a significant drop in T, L, and a loss of sound insulation in a particular sound range often occur due to the coincidence effect and resonance transmission, especially in the low range. Furthermore, relatively low-frequency noise has been viewed as a problem as noise pollution that has received particular attention in recent years.

For example, fundamental sounds of sound equipment such as pianos and stereos, karaoke noises, impact noises such as before opening and closing doors, noises from compressors and fans of large refrigerators and air conditioners (in front of household appliances), etc. range from several tens of Hz to 1. i o There are significantly more low-frequency noise sources in the OHZ near residents. Even if the sound insulation loss caused by resonance transmission in the bass range is moved to the bass side, the problem still cannot be solved. Other countermeasures against sound insulation defects include inserting high-performance sound absorbing materials and applying vibration-damping treatment to face materials, but these are expensive (and often not sufficiently effective).

It is particularly important to note that common methods for improving sound insulation performance are not very effective in improving sound insulation deficiencies, and in some cases may even make the sound insulation deficits worse. For example, separating the studs, which is often used as a means to prevent the deterioration of sound insulation performance due to sound trees, promotes the resonance transmission of the low frequency range of double walls, often exacerbating the drop caused by defects by several dB. This is because the two opposing walls in a double-walled structure are structurally separated by the independent studs, resulting in a relative decrease in strength, and each wall surface, including the independent studs, tends to vibrate as a unit. This is thought to be due to the appearance of a resonant state over the entire wall surface.

Mr. Motoyama had already proposed improvement of such sound insulation defects in Tokuho No. 58-115192 and Japanese Patent Application No. 174491/1981, but he also found that the sound insulation defects could be improved by another method. Heading, Achievement of the present invention〇 (Means for solving the problem) The present invention was made by focusing on the basic natural frequency of the finishing material that is a constituent element of the structure, in order to solve the above problem, The gist thereof is to provide a multi-wall body in which a gap is provided on at least one side of the wall body, and the finishing material is fixed to the fixing material arranged at predetermined intervals, the finishing material being fixed to the finishing material plate. In a belt-shaped region of a predetermined width in the vertical and horizontal directions that includes a circle with a diameter of 60011 centered on the centroid of the surface, the area where the fundamental natural frequency is 500H2 or more is 30% or less of the total area of the belt-shaped region , 30% to 30% of the area is less than 300 HZ
It concerns a sound insulation structure configured as 60%.

Examples of wall bodies that can be used in the present invention include concrete, PC board,
A ceramic wall made of ALC board, mortar, etc., a metal wall made of steel plate, etc., or a wall made of stone, block, tile, brick, etc. are used.

In addition, as finishing materials, gypsum board, asbestos board, silica board, particle board, cement board, plywood, etc. are used.

As a multi-wall structure, for example, as shown in Fig. 2, bond adhesive is used as a fixing material (3) to the wall body 111 such as concrete, and this bond is arranged at predetermined intervals as shown in Fig. 3, for example. It is constructed by gluing and fixing the finishing material (2) such as gypsum board.In this example, the finishing material is placed on one side of the wall, but it may also be placed on both sides. The fixing material may be constructed by partitioning the wall surface with beams, studs, etc., as shown in FIG. 4, and fixing the wall and the finishing material with adhesive or the like through the beams, studs, etc. In this case, a cavity partitioned by a beam or the like may be filled with a sound absorbing material such as glass wool, a heat insulating material such as a polymer foam, or the like.

The multi-walled structure according to the present invention made of these materials is constructed under the following specific conditions. That is, the finishing material constituting the multi-wall structure includes a circle with a diameter of 601 mB centered on the centroid on its plate surface, preferably 80 (Fj ~ 1
A strip area of 00aIk is provided in the vertical and horizontal directions,
In these two orthogonal band-shaped regions, the area where the fundamental natural frequency is 500 Hz or more is 30 cm or less with respect to the total area of the band-shaped region, and the area where the fundamental natural frequency is also less than 300 Hz is 'i50.
% to 60%.

In addition, the basic natural frequency is 400 HZ or more and 500 H
The area less than Z is 40% of the total area of the strip area.
Hereinafter, it is preferable that the area of 500 H2 or more and less than 4 r:J OHZ be 20% to 60%.

Here, the fundamental natural frequency refers to the natural frequency of primary bending of the plate as shown in FIG. 1 (hereinafter simply referred to as natural frequency, and abbreviated as Fp k).

The strip areas are provided in the vertical and horizontal directions as shown in FIG. In this case, it is necessary to include a circle with a diameter of 60 (up to) centered on the centroid within the area. That is, the living space is mainly located close to the centroid of the wall and its surrounding area, which can represent the sound insulation performance of the entire dining area and can also play a dominant role on the wall.

If the width of the band-shaped region is too small, even if the difference in natural frequencies is increased, the effect on the entire structure will be small and the desired improvement of sound insulation defects will not be achieved. Conditions such as the size of the structure Taking this into consideration, if there is a difference in the natural frequency described above in a band-shaped region having a width that includes a circle with a diameter of 60 CIIk centered on the centroid, the sound insulation deficiency will be improved, and the frequency will be 80 to 100.
It is preferable to have a width of (to).

It is necessary that the natural frequencies of the above finishing material be distributed under specific conditions in the band-shaped region of the above width.

That is, it is formed from a plurality of regions having different natural frequencies.

Sound insulation defects mainly occur due to resonance phenomena at various levels, from the level of individual constituent members of the wall structure to the level of the system for achieving coupling between these members (including the air layer). Also, at this time, the vibration behavior of the finished material that becomes the sound incident or radiation surface is an important factor. For example, the coincidence effect is almost determined by the wavelength and propagation speed of the bending vibration of the plate.

Also, in resonance transmission in the low frequency range, the resonance frequency fr
The relationship between mL and the natural frequency of the plate is important.

In general, the natural frequency Fp of bending of a homogeneous rectangular plate is given by the following equation in the case of peripheral support.

Fp*157 (1 gun + listen)・■・One mora with V1-7-
Here, a and b are the length and width of the rectangle, ■ is the thickness of the board,
E represents Young's modulus, ρ represents density, and ν represents Poisson's ratio.

In addition, when the periphery is fixed, it is given by the following equation.

π 14 2.25 ”= 4v'A (a” ”-b”tsu-g-Aan7 〒
1) - However, in this case, a is the length of the long side and b is the length of the short side.

Therefore, in this example, the rectangular shape (a, b)
It can be seen that if you change , lPp will also change.

Therefore, the Fp of the plate can be changed by changing the position (or spacing, etc.) of the structural reinforcing material in the wall body. Furthermore, by making the position of the reinforcing material uneven, the Fp of the finishing material can be improved. It is possible to make it heterogeneous. In this way, when the finishing material is dispersed under the Fpt=predetermined condition in the multiple H4 structure, the occurrence of the above-mentioned defects is greatly reduced.

First, the area where the natural frequency is t-500Hz or higher must be 30% or less of the total area of the band-shaped region03
This is because if it is more than 0%, the solid propagation component and plate vibration component of the incident sound will overlap significantly, and there is a great possibility that the mid-range sound insulation performance of the wall will be significantly deteriorated.

400 for the same reason! It is preferable that the area greater than or equal to 'IZ is also less than or equal to 40-0. Furthermore, it is necessary that the area less than or equal to 3001'IZ be in the range of 30% to 60% of the total area of the band-shaped region. This is because if it is less than 30%, the dispersion of FP will be insufficient, and if it is more than 60Ls, it will be less than 500Ls.
In the Fp area below IIZ, there is a high possibility that sound insulation defects due to resonance transmission in the bass range will become large, and therefore the area of the area needs to be t-60% or less. In addition, the dispersion effect of pp becomes insufficient if it exceeds 60%.Furthermore, the area of the natural frequency of 300Hz or more and less than 400Hz is in the range of 20% to 60% of the total area of the band-shaped region. It is preferable.

Being within this range makes it easier to disperse the basic natural frequency in relation to the above-mentioned conditions (and effectively works to improve sound insulation defects). In addition, in a structure in which finishing materials are disposed on both sides of the wall surface, it is also effective to make the FPt of opposing band-shaped regions different from each other.

Therefore, as a method for forming a plurality of regions having different basic natural frequencies in the band-shaped region, for example, the plurality of regions are formed with different surface densities and/or rigidities. (As shown in Figure 3, the bond may be placed in dense areas and sparse areas.) In addition, multiple finishing materials may be applied using structural reinforcing materials such as beams and studs. When partitioning into regions, the areas may be formed with different areas.Also, these may be combined.In addition, a multi-layered wall formed by further forming a decorative material on the upper layer of the finishing material. Even if the decorative material is a wall covering material such as wallpaper or vinyl cloth, or if it has mass and vibration damping properties such as a soft sound insulating sheet, it is considered to be part of the finishing material and the above conditions are met. It can be added.

The natural flexural frequency of the board varies greatly depending on its supporting and fixing conditions, as described above. The difference between cases (e.g., Figure 3) is large; and in the latter case,
The Fp of the plate material varies depending on the bonding area and shape of each joint. However, in any case, the vibration properties of a certain part of the plate are determined by relatively nearby fixed and boundary conditions, and there is a method for calculating its approximate value. The equation for the rectangular plate described above is one example. Similarly, it is possible to use several adaptation formulas depending on the shape, etc., or it can be analytically determined or designed by numerical calculations such as the finite element method.On the other hand, if an FF'T waveform analyzer is used, , FPt- can be detected experimentally and used in design. Furthermore, if we perform modal analysis, we can determine not only the frequency and vibration amplitude of each part of the board (together with the vibration spectrum), but also the
Various parameters and modes of vibration (mode shapes) are also specified, and it is possible to determine the natural frequency Fp of bending of each part of the board and its cooperative vibration region (i.e., the inhomogeneous region of F'p). Yes, of course, it is also possible to design a structure based on these.

By the above method, finish material? It is possible to design or determine the distribution of . If the area of the bonded (adhesive) part is particularly large, for example, if it exceeds 40% of the area of the finished material, the negative effect of structure-borne sound will be large, so the area of this bonded part should not be in the above-mentioned Fp400 HZ or higher area. It must be assumed that the total area of the non-bonded part is Fp of 40
Must be 0Hz or less◇However, except for such cases, the area of this joint/fixing part may be allocated as appropriate to the area of each adjacent area where plate vibration is performed. Therefore, it is sufficient to fully calculate (consider) only the distribution of Fp due to the plate vibration of the normally finished material.

In this way, by identifying the area of the main part that corresponds to the living area of the finishing materials that make up the structure and setting the basic natural frequency in that area under the above-mentioned specific conditions, it is possible to This improves the lack of sound insulation, which had become a major problem in the body.

(Example) The present invention will be further explained below based on Examples.

Comparative Example 1 Bond adhesive (3) was applied to the lattice points of about 5 (H) IS pitch on the ALC wall (1) with a thickness of about 501 II as shown in Fig. 2.
is deposited, and the area density is 65-/180× with a thickness of 9 dew.
It was constructed by gluing a gypsum board (2) with 180 scratches and a hollow layer (4).The width of the hollow layer was about 20 mm, and the ratio of the adhesive area to the wall area was about 25 mm. . Also,
The natural frequency of the finishing material, gypsum board, is 200 Hz.
@Regarding this multi-walled body, the sound transmission loss (T,
Figure 9 shows the results of the measurements of 200 H! Sound insulation defects occur near I due to resonance transmission in the low frequency range.

Comparative Example 2 Gypsum boards 1 and 21 used in Comparative Example 1 were attached to both sides of the 9 ALC wall (1) used in Comparative Example 1 using bond adhesive in the same manner as in Comparative Example 1, and from the triple wall The natural frequency of each part of the gypsum board, which is the finishing material, was about 200111 g on both sides, the same as in Comparative Example 1.
In addition, regarding the gypsum boards of Comparative Example 1 and this example, there was almost no difference in the basic natural frequency no matter which part was measured.

Regarding the multi-walled body of this example, T and L are relatively similar to 1.

Measurements were made. The results are shown in No. 9N. As shown in the figure,
Compared to Comparative Example 1, the overall sound insulation performance is improved in terms of mass, but the sound insulation loss due to resonance transmission in the low frequency range is further expanded due to double-sided construction, and is approximately 4. 0
There is also a large sound insulation defect due to the coincidence effect near 00 IIs.

Example 1 In the multi-wall body used in Comparative Example 2, gypsum board (2
) as shown in Figure 5.
A sound insulation structure according to the present invention was formed by dividing the area into areas, gluing the timbers, and fixing a gypsum board with an adhesive. The basic natural frequency of each part of the finishing material in this structure is determined by providing a band-shaped area with a valley width of 90 (up to) in the vertical and horizontal directions, including a circle with a diameter of 60 squares centered at the centroid Pi shown in Figure 6. When the FP of the band-shaped area was calculated, each area of 500 Hg or more was
The area of 1400~500111g is about 10 inches, 300~
Approximately 40% of the areas had earthquakes of 400 Hg and 45% had earthquakes of 500 Hg or higher.

This structure was also measured for T and L in the same manner as Comparative Example 1. The results are shown in Figure 9.
The sound insulation deficit near a has been significantly improved.

Example 2 In the multi-wall body used in Comparative Example 2, the bond (3) was arranged at uneven intervals as shown in Fig. 7, and the structural reinforcing material such as wood used in Example 1 was not used. Similar to Comparative Example 2, gypsum boards were adhered to both sides to form a sound insulating structure tube according to the present invention.The adhesive area of 0 pounds was approximately SSS of the entire wall surface.

Regarding this structure, as shown in Fig. 6 (we provided strip-like regions each having a width of 90aIh in the vertical and horizontal directions, and calculated the Fp k of each part of the finishing material in the strip-like regions, the region with pp of 500Hz or more was approximately 10 Excellent, 400-500 TL area is about 1
5%, 300-400Hg (D area is approximately 40% and 30%
The area where 0 Hg was not dropped was approximately 35%.

Regarding this structure, T and L were also measured in the same manner as in Comparative Example 1. As shown in Fig. 9 and Fig. 0 of the results, since bond is used to fix the finishing material, there is a lot of solid-borne sound (,50
0H! Although it is not as good as Example 1 near +, it is a significant improvement over Ratio JR Example 2 using the same adhesive.

Comparative Example 3 In contrast to Comparative Example 2, the adhesive (GL Bond) was used as shown in Figure 8 (
(Similarly, gypsum board is installed on both sides, and the T,
L, f The distribution of the natural frequency yp of the finished material in the area of the shape shown in Figure 6 measured is that the area where IFp is 500H or more is about 70cm, and the area where Fl> is less than 300pm is about 30mm. Figure 10 shows the measurement results of T and L for this example. For example, the sound insulation properties were generally lower compared to the examples, and the sound insulation defects were not improved.

Comparison 914 Next, the bond pitch for Comparative Example 2 was set to about 25 to 30.
Place the adhesive within the range of (to), install gypsum board on both sides, measure the TL, and find that the distribution of the natural frequency Fp of the finished material in the area of the shape shown in Figure 6 is 500 Hg or more. The area of the earthquake is about 5, 400-500E [the area of the earthquake is about 15
%, 500-400 Ha f) K approx. 6o %, 3o
o Hg Hereinafter, i>f about 20%.The measurement results are shown in FIG. As shown in the figure, the sound insulation properties are generally worse than Comparative Example 3 (and the sound insulation loss is also large).

(Effects of the Invention) As explained above, the present invention can reduce the drop in acoustic transmission loss due to the coincidence effect, which has been considered difficult in the past, and the drop in transmission loss due to resonance transmission in the low frequency region, which has been considered even more difficult. It is a marked improvement, especially in G.
, it has great significance in that it improves the above-mentioned problems specific to L construction method walls. In addition, this structure can be used not only for multiple walls such as ceilings and floors, but also for soundproof boxes and soundproof walls.
A similar effect can be obtained.

[Brief explanation of drawings]

Figure 1 is a state diagram showing the state of the first-order natural vibration of the plate.
The figure is a partially cutaway cross-sectional view of a wall using the G and L construction methods, Figure 3 is a state diagram showing an example of bond adhesive placement, Figure 4 is a state diagram of nine examples in which finishing materials are partitioned with timber, and Figure 5 Figure 6 shows the state in which the intervals are equally partitioned by strips, Figure 6 shows the state in which each strip area is provided in the vertical and horizontal directions, and Figure 7 shows the bond adhesive used in Example 2. Figure 8 shows the arrangement of Comparative Example 3.
Figure 9 is a diagram showing the arrangement of the bond adhesive used in Comparative Examples 1 and 2 and Examples 1 and 2, and the measurement results.
Figure 8 is a diagram showing the T, L, and measurement results of Comparative Examples 3 and 4 @ Patent applicant Zeon Corporation Figure 1 Figure 2 Figure 4 Figure 5 Figure 6 Figure 7 Figure 9 1/3 octave 1 (: Jm, 7i! (HZ) Figure 10 1/3 octave 1 (HZ)

Claims (1)

[Claims] 1. A multi-layered wall body in which a gap is provided on at least one side of the wall body and finishing materials are fixed by fixing materials arranged at predetermined intervals, and the finishing material is arranged so that the centroid of the surface of the finishing material plate is fixed. The basic natural frequency is 500H in a belt-shaped area of a predetermined width in the vertical and horizontal directions that includes a circle with a diameter of 60 cm at the center.
The area that is equal to or larger than Z is 30% of the total area of the strip area.
Hereinafter, a sound insulating structure characterized in that the area is less than 300 Hz in 30% to 60%.