JPH07150749A - Soundproof floor material - Google Patents

Abstract

PURPOSE:To absorb the floor impact sound and reduce its propagation to the lower floor by forming a layered product made of multiple-layer honeycomb materials via bulkheads, and forming through holes corresponding to cells of the honeycomb materials on the bulkheads. CONSTITUTION:A layered product made of multiple-layer honeycomb materials 1, 7, 8 via bulkheads K... is formed. Through holes 10... corresponding to cells 7a, 7a of the honeycomb materials 1, 7, 8 are formed on the bulkheads K.... Both opening faces on the front and rear of the layered product are sealed with plate materials 2a, 2b. At least one of the plate materials 2a, 2b is preferably made of a vibration control plate, and at least one of the bulkheads K... is preferably made of a vibration control plate. Resonators and silencers are formed by the honeycomb materials 1, 7, 8 and the bulkheads K... having the through holes 10... communicated with them, and the floor impact sound is absorbed and reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof flooring material, and more particularly to a soundproofing flooring material for reducing the impact sound of the floor in a wooden framed house to provide soundproofing.

[0002]

2. Description of the Related Art In a wooden framed house, a chair is dragged on the upper floor, and a lightweight impact sound caused by walking noise of slippers does not cause much problems when tatami mats or carpets are laid, but in recent years This is a problem with flooring (wooden floor materials), which is increasing because it is not healthy and is easy to clean. In other words, even in a detached house in which only the family lives, floor impact noise has become an issue that needs to be improved nowadays because the time to live is complicated and various audio equipments have become indispensable. . The floor impact sound is divided into a lightweight impact sound that is generated when a child jumps and a lightweight impact sound that is a sound that is generated when a hard object such as a spoon falls or when a chair is pulled. Therefore, it is necessary to improve the weight and the weight of the floor impact sound.

Conventionally, in a wooden framed house, a flooring is laid on a joist provided on a floor beam through a base material. Then, as a method for improving floor impact sound in such a floor structure, a method of laying a vibration-proof mat made of vulcanized rubber or an asphalt damping material between the flooring and the base material, or two sheets A sandwich structure having a vibration-damping sheet sandwiched between the base materials has been proposed.

[0004]

However, the floor impact noise is sufficiently reduced in the above-mentioned soundproofing floor material made of vulcanized rubber or asphalt damping material, or soundproofing floor material made of a sandwich structure of damping sheets. There is a problem that it cannot be done.

That is, although the above-mentioned vibration-proof mat or sandwich structure has the effect of damping the light-weight impact sound in the middle and high frequency range due to the vibration propagation by the vibration-damping action,
Of the floor impact sounds, the effect of reducing the weight impact sound in the low frequency range generated when a child jumps on the floor or the like is low. This low-frequency heavy impact sound is more uncomfortable for the people on the lower floors than the light-weight impact sound in the mid-high frequency range, but the current situation is that measures have not been taken sufficiently. Was desired.

The present invention has been made to solve the above problems, and an object thereof is to reduce floor impact sound, and particularly to reduce heavy impact sound in a low frequency range which is uncomfortable in the lower floor. An object of the present invention is to provide a soundproof floor material that can be manufactured.

[0007]

In order to solve the above problems, the present invention comprises a laminated body composed of a plurality of layers of honeycomb material via partition walls, and the partition walls have through holes corresponding to the cells of the honeycomb material. Is provided, and both opening surfaces on the front and back sides of the laminate are sealed with a plate material to provide a soundproof floor material.

In this case, at least one partition wall is formed in each cell of the honeycomb material so as to be separated in the thickness direction thereof, and the partition wall has through holes corresponding to the cells of the honeycomb material. Has been formed. Further, a sound absorbing material may be arranged in each cell of the honeycomb material. It is effective to use a damping plate for at least one side of the previous period. As this damping plate, insert a damping resin such as a polyolefin resin between plate materials such as a steel plate, etc. with a grain boundary oxide layer generated on the surface layer, a single type damping plate such as a special alloy, or a steel plate, aluminum plate, etc. The composite type damping plate described above may be used.

Similarly, at least one of the partitions is
By using the vibration damping plate, the soundproofing characteristics can be further improved.

[0010]

In the soundproof flooring material of the present invention, for example, a surface plate material is attached to one opening surface of a laminate made of a honeycomb material,
It is laid on the floor beam with a plate material attached to the other opening surface. Then, a plurality of resonators (so-called Helmholtz resonators) are formed by the cavity and the through holes in each cell of the honeycomb material.
Is configured. In this state, when an impact sound is generated on the surface plate material and is radiated to the lower surface of the surface plate material and a vibration sound of the resonance frequency of the resonator enters the through hole, the vibration sound is amplified and air is violently generated in the through hole. Vibrate. Then, due to the vibration of the air, a friction loss is generated, a vibration sound having a resonance frequency is absorbed, and an impact sound is reduced. In this way, a plurality of hollow silencers are formed between the partition walls and the plate member and between the hollow portions and the through holes in the cells of the honeycomb material existing between the partition walls. Therefore, if you set the resonance frequency of the resonator to the low frequency range,
The heavy impact noise that is unpleasant on the lower floor is reduced.

The factors that determine the resonance frequency of the resonator include the inner diameter of each cell of the honeycomb material, the length in the thickness direction of each cell of the honeycomb material, the length of the through hole, and the effective neck of the neck. Examples include the length and the diameter of the communication hole. The effective length is the length of the through hole provided in the partition wall (corresponding to the wall thickness of the partition wall). The resonance frequency can be adjusted by changing each of these factors. That is,
The resonance frequency decreases in inverse proportion to the inner diameter of each cell of the honeycomb material, the length of each cell of the honeycomb material, and the effective length of the neck,
It increases in proportion to the diameter of the through hole. For example, the inner diameter of each cell of the honeycomb material is 9 mm to 50 mm, the length of each cell of the honeycomb material is 30 mm to 150 mm, and the effective length of the neck is 5.
mm to 30 mm, the diameter of the through hole is 3 mm to 30 mm, and the resonance frequency is set to 50 Hz to 500 Hz,
It is effective in reducing the weight impact sound in the low frequency range (50 to 500 Hz).

The sound absorbing action of the vibration sound absorbs not only the vibration sound having the resonance frequency but also the vibration sound having a narrow range of frequencies near the resonance frequency. The sound absorption effect is improved as the volume of the cavity in each cell is increased, but it is a necessary condition for the resonator to function as the volume is smaller than the wavelength of the vibration sound. In addition, the size of each of the above factors must be smaller than the wavelength of the vibration sound.
It is desirable to be below, and it is desirable to be 1/300 or above. The reason why such a numerical range is desirable is that the sound absorbing effect is drastically reduced outside this range.

Further, the soundproof floor material according to claim 2 is characterized in that a damping plate is used as the plate material.
A composite type vibration control plate or a Ni-type vibration control plate in which a material with vibration damping performance such as polyolefin resin or rubber or asphalt is inserted between face materials such as stainless steel plate, aluminum steel plate, titanium steel plate, lead steel plate, ordinary steel plate, special steel plate. Ti, Mn-Cu, Z
Examples thereof include alloys such as n-Al, Fe-Cr, and Mg-Al-based alloys, and simple type vibration damping plates such as those having a grain boundary oxidation layer on the surface layer of a steel sheet. With such a plate material, it is possible to convert vibration energy into heat such as friction energy, and effectively attenuate light impact sound particularly in the middle and high frequency ranges.

Further, in the soundproof floor material according to the second aspect, since the cavity is formed by each cell between the partition wall and the surface plate material, and the through hole provided in the partition wall constitutes the resonator, the sound absorbing function is achieved. Vibration noise is absorbed.

Further, in the soundproof floor material according to the third aspect of the present invention, since at least one of the partition walls is made of a vibration damping plate, it is possible to radiate vibration by internal friction like the plate material so as to exhibit higher vibration damping performance. You can

[0016]

【Example】

Example 1 Example 1 will be described. As shown in FIGS. 1 and 2, the honeycomb material 1 includes an upper-layer honeycomb material 7 and a lower-layer honeycomb material 7,
8 has a two-layer structure, and a composite type vibration damping plate 9 in which a polyolefin resin is sandwiched between aluminum plates having a thickness of 3 mm is interposed therebetween. Then, partition walls K are formed by the damping plate 9, and the partition walls K form cells 7a of the upper-layer honeycomb material 7 and cells 8a of the lower-layer honeycomb material 8.
And are separated. A through hole 10 is formed in the partition K. In this example, the inner diameter d of the cells 7a and 8a of the upper and lower honeycomb materials 7 and 8 was 38 m.
m, the length of the cell 7a of the upper layer honeycomb material 7 is 37 mm, the length L of the cell 8a of the lower layer honeycomb material 8 is 50 mm, and the diameter D of the through hole 10 is 3 mm.

The soundproof panel B constructed as described above is
Thickness 1 on the floor beam 4 which constitutes a wooden framed house (not shown)
A flooring 6 is placed between the 10 mm joists 5, and a flooring 6 is laid on the soundproof floor panel B and joists 5 with an adhesive.
At this time, in the soundproof floor panel B, the through hole 10 and the hollow portion in the cell 8a of the lower honeycomb material 8 constitute a hollow silencer (hereinafter, simply referred to as a silencer) S.

With respect to the 5 points of the flooring 6, according to the method of JIS-A-1418, the heavy impact sound insulation class is equivalent to L-65, and the light impact sound insulation class is L-60.
Therefore, both weight and light weight impact noise could be reduced. The reason for this is that the sound transmission of the soundproof floor panel B attenuates the airborne sound in the relatively high and middle frequency range due to the silencing effect of the silencer S. The attenuation value R of the airborne sound by the silencer S is calculated by the following mathematical formula 1 based on the above-mentioned dimensions according to the frequency of the impact sound.

[0019]

[Equation 1]

FIG. 5 shows a graph of the attenuation value R obtained by the mathematical expression 1 in correspondence with the frequency. As described above, in this embodiment, the muffler S is used to control the middle and high frequency range (1 KHz
(About 2 Hz) air-borne sound can be attenuated to reduce lightweight impact sound.

Since the cavity P of the cell 7a of the upper honeycomb member 7 and the through hole 10 constitute the resonator P, the sound absorbing action of the resonator P can reduce the weight impact sound. That is, the resonance frequency fo of the resonator P in the first embodiment is the same when the length of the cell 7a is 37 mm and the through hole 10
Has a length of 3 mm, which is shorter than the length of the cell 1a and the length of the communication hole 3 of the first embodiment, and is about 290 Hz.

The present invention is not limited to the above-mentioned embodiments, but may be carried out as follows within the scope of the present invention.

(1) With the structure of the above-described first or second embodiment, a sound absorbing material such as glass wool or rock wool is arranged in the cells 1a of the honeycomb material 1 and the cells 7a, 8a of the upper and lower honeycomb materials 7, 8. Thus, the reduction of impact noise may be promoted.

(2) In the first embodiment, for example, the diameter or other dimensions of the through hole 10 may be changed to adjust the attenuation R of the airborne sound according to the frequency.

(3) Although the present invention is embodied in the soundproof panel B, it may not be a panel. In this case, each member is the floor beam 4
The soundproof floor material is formed by sequentially bonding the layers with an adhesive or the like.

(4) The honeycomb material 1 may be made of wood other than paper, such as aluminum, fibers, and plywood.

(Second Embodiment) Next, a second embodiment will be described. The honeycomb material is laminated in three layers, and a vibration damping plate 9 having a total thickness of 3 mm and sandwiching an asphalt-based material in a stainless steel plate is interposed as a partition wall between the layers. The partition K has a through hole 10 with a diameter of 3 mm.
Are formed. In this example, the inner diameters d of the cells of the upper, middle and lower honeycomb materials 7, 11 and 8 are all 38 mm, the length of the cells 7a of the upper honeycomb material 7 is 25 mm, and the cells of the middle honeycomb material 11 are Cell length L
Is 31 mm, and the length of the cell 8a of the lower honeycomb material 8 is 31 mm.
mm. Each level of the heavy impact sound and the light impact sound of the thus-configured soundproof panel was measured under the same conditions as in Example 1. As a result, the cut-off rating for heavy impact noise was equivalent to L-60 and the cut-off rating for lightweight impact noise was L-55, and both weight and lightweight impact noise could be reduced.

(Comparative Example 1) A joist 5 having a thickness of 110 mm is arranged on a floor beam 4 which constitutes a wooden frame house (not shown).
A flooring 6 is laid on the joist 5 with an adhesive.
In this comparative example, no soundproofing measures are taken. (Conventional construction method) Each level of the heavy impact sound and the light impact sound without soundproofing was measured in the same manner as in Example 1.
As a result, the heavy impact sound cutoff rating was L-75, and the light impact sound cutoff rating was L-80.

(Comparative Example 2) A joist 5 having a thickness of 110 mm is arranged on a floor beam 4 which constitutes a wooden frame house (not shown).
An anti-vibration mat made of an asphalt-type damping material was laid on it, and a flooring 6 was laid on it with an adhesive. Each level of the heavy impact sound and the light impact sound of the vibration damping mat was measured under the same conditions as in Example 1. As a result, the heavy impact sound cutoff rating was L-70, and the light impact sound cutoff rating was L-70.

[0030]

As described in detail above, according to the present invention, since a plurality of resonators and silencers are constructed from the honeycomb material and the partition walls having the through holes communicating with the honeycomb material, the floor impact is caused by the sound absorbing action and the like. It has an excellent effect that the sound can be reduced, and in particular, the heavy impact sound in the low frequency range which is uncomfortable in the lower floor can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a usage state of a soundproof floor panel according to a first embodiment of the present invention.

FIG. 2 is likewise a partially cutaway plan view showing the soundproof floor panel.

FIG. 3 is a cross-sectional view showing a usage state of the soundproof floor panel of the second embodiment.

FIG. 4 is a partially cutaway plan view showing the soundproof floor panel.

FIG. 5 is a graph showing the attenuation value of impact sound by the soundproof floor panel.

[Explanation of symbols]

 1 Honeycomb Material 2a, 2b Plate Material 7 Upper Layer Honeycomb Material 7a Cell 8 Lower Layer Honeycomb Material 8a Cell 10 Through Hole 11 Intermediate Layer Honeycomb Material K Partition B B Soundproof Floor Panel

Claims (3)

[Claims] 1. A laminated body composed of a plurality of layers of honeycomb material via partition walls, and the partition walls are formed with through holes corresponding to the cells of the honeycomb material, and both opening surfaces of the front and back surfaces of the laminated body are formed. Is a soundproof floor material that is sealed with a plate material. 2. The soundproofing floor material according to claim 1, wherein at least one of the plate materials is a vibration damping plate. 3. The soundproof floor board according to claim 1, wherein at least one of the partition walls is a damping plate.