JPH059388Y2 - - Google Patents

Description

[Detailed Description of the Invention] The object of the present invention is to provide a sound insulating base material for a wooden floor that can prevent the sound generated from the wooden floor from being transmitted downstairs. Wood floors generate sound at a frequency unique to wood (natural frequency), and these sound waves are very easy to propagate downstairs.
In order to prevent this vibration noise from being transmitted downstairs, it is known that a foam sheet is pasted on the back of the wooden flooring.
However, this known material was not always sufficient. Additionally, floor impact noise can be roughly divided into two types. One type is the so-called heavy floor impact sound that occurs when children or the like jump around in a room, and the frequency range of this sound is mainly low, and its energy level is high. The other type of sound is the sound caused by falling small objects, and this is mainly a high-frequency sound. Even with wooden floors, there are some differences in the natural frequency of sound depending on the material, thickness, etc., but in any case, there is still a high frequency part and a low frequency part.
These sounds not only travel vertically through the wood, but also laterally, and this results in the sound sometimes being transmitted downstairs along with resonance through walls and metal pipes within the walls. Among these propagated sounds, downwardly propagated sounds are a problem, and in particular, no material has been provided that can absorb or insulate high-energy sounds such as the heavy floor impact sound. Of course, it is known in the past that heavy floor impact noise can be absorbed to some extent by using, for example, thick foam. However, in this case, the material cost is high and
The floor surface also becomes higher, which may not be applicable depending on the building, and is particularly disadvantageous for high-rise residential buildings. The present invention improves the shortcomings of conventional floor sub-materials, and provides a sub-floor material that is relatively thin and can absorb the above-mentioned heavy floor impact sound. A high-frequency absorbing material consisting of two or more plastic sheets, soft rubber, shock-absorbing resin, high-damping anti-vibration rubber, gel, pudding-like material, and one type of asphalt. The gist of this article is a sound insulating base material for wooden floors that is made of a layered layer of low-frequency absorbing material that propagates and absorbs waves in both directions, and a vertical vibration absorbing material made of a foam sheet. , and conversely, the higher the specific gravity, the more advantageous it is for sound insulation and sound absorption.High frequencies generated from wood, etc. with a specific gravity of 1 or less, have relatively low energy, so it is recommended to use materials with twice that amount or more. This problem can be solved by using a material with a specific gravity of 2 or more.The present invention will be explained below with reference to the drawings.In Fig. 1, 1 is a high frequency absorber;
Approximately 2 to 5 mm for plastic sheets with a specific gravity of 2 or more.
(Regarding this, please refer to Japanese Patent Application Laid-Open No. 137825/1982 entitled "Sound Insulating Material" previously filed by the applicant of the present application). The resin is not particularly limited as long as it satisfies the above conditions, but in terms of cost, a resin such as a vinyl chloride sheet containing a relatively large amount of filler is desirable. With this high-frequency absorbing material, most of the high-frequency sounds emitted from the wood are absorbed and disappear, so almost no high-frequency sounds are transmitted to the layer below. Next, 2 is a low frequency absorbing material that disperses and absorbs vibrations in the vertical direction in the horizontal direction.This absorbing material includes soft rubber, asphalt, shock absorbing (elastic) resin [for example, Nippon Zeon Co., Ltd.] Highly damping anti-vibration rubber (trade name: Nosolex), gel or pudding-like material (however, it can maintain its shape under a certain amount of load), etc. are used. The above-mentioned soft elastic material horizontally disperses the vibration sound that attempts to propagate downward within its own layer, and attenuates and absorbs it. This is because, unlike the upper plastic layer, this layer has soft elasticity, and unlike the foam layer below, it is also a continuous layer that is dense in the lateral direction (horizontal direction), so vibrations from above are absorbed within its own layer (horizontal direction). It has excellent dispersion and attenuation effects, and is particularly effective in absorbing low-frequency and high-energy sounds, such as the aforementioned heavy floor impact sound. Of course, in this invention, when we refer to a high frequency absorbing material or a low frequency absorbing material, it does not necessarily mean that it absorbs only that frequency band, but it goes without saying that it also absorbs other frequency bands to some extent. Although the thickness of this member 2 is arbitrary, it is preferably about 2 to 5 mm in use. Further, numeral 3 acts to absorb vibrations in the vertical direction that could not be absorbed by member 2, and is a foam sheet conventionally used as a sound insulating material, such as slightly hard vinyl chloride resin foam, urethane foam, etc. It is a sheet of foam, etc. The thickness of this sheet may be about 5 mm to 10 mm. The wooden floor sound insulating base material of the present invention, which consists of the above three layers, preferably has a thickness of about 9 mm to 20 mm as a whole. It is used as an insole between In this way, if the wooden floor sound insulating material of the present invention is used, even if the total thickness is as thin as 9 to 20 mm, the characteristic sound emitted from the wooden floor will be due to the actions of the members 1, 2, and 3 mentioned above. It has excellent effects such as almost completely absorbing the heat, hardly transmitting it to the subfloor, and the floor surface not being too high, and reducing loss of indoor space, making it suitable for high-rise residences. Moreover, since each member can be made of relatively inexpensive materials, there is an advantage that the entire product of the present invention can be provided at a low cost. Example A wooden floor with a thickness of 3.5 m/m on a concrete slab with a thickness of 120 m/m, and the base material of the present invention (specific gravity
2.1, JISA-
The floor impact sound level (L) was measured using the method specified in 1418. The results are shown in the table below. (The lower the number, the lower the impact sound level downstairs.)
The table also shows that the sound insulation performance of the base material of this invention is good. 【table】

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of the sound insulating base material for wooden floors of the present invention. 1... High frequency absorber, 2... Lateral low frequency absorber, 3... Vertical vibration absorber.

Claims (1)

[Scope of utility model registration request] In order from top to bottom, the high-frequency absorbing material consists of a plastic sheet with a specific gravity of 2 or more, soft rubber, shock-absorbing resin, high-damping anti-vibration rubber, gel, pudding-like material, and one type of asphalt. This sound insulating base material for wooden floors is made by layering a low frequency absorbing material that propagates and absorbs laterally from that point, and a vertical vibration absorbing material made of a foam sheet.