JPH0553911B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a floor structure with excellent sound insulation properties suitable for use in, for example, apartment complexes.

<Conventional technology> Floor impact noise transmitted from the upper floor to the lower floor of an apartment complex,
In particular, it is difficult to prevent floor impact noise caused by weight impact such as when a child jumps, and we are struggling to find countermeasures.

Conventionally, methods for insulating floor impact noise include making the slab thicker, using a wet floating floor structure where the upper floor is made of mortar or various types of concrete, or using a dry floating floor structure where the upper floor is made of plywood, etc. Also, methods such as creating a double floor using support legs with rubber seats are often used.

<Problems to be solved by the invention> However, if the slab is made thicker or a wet floating floor structure is adopted, the slab and upper floor become heavier and the structural members such as columns become larger, resulting in higher costs. There's a problem. In addition, it has been pointed out that wet floating floor structures have construction difficulties, such as difficulty in curing the buffer layer.

On the other hand, dry floating floor structures and double floor structures have a lightweight upper floor and are easy to construct, which compensates for the above drawbacks, but there are other reasons such as difficulty in lowering the natural frequency of the floor structure. However, the low frequency blocking performance is poor, and the overall soundproofing performance is poor.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to simply and inexpensively provide a floor structure that can cope with floor impact noise in all frequency ranges by improving its isolation against vibrations, especially in low frequency ranges. .

<Means for Solving the Problems> In order to achieve the above object, the floor structure of the present invention includes a box between a slab and a flooring material, which has a side wall formed of an elastic material and whose inside is filled with granular material. The present invention is characterized in that a support member that presses the granular material with a flange portion provided at one end is disposed, and the flooring material is supported by the support member and the granular material.

<Function> When an impact is applied to the surface of the floor finishing material, vibrations occur in the floor finishing material. This vibration is transmitted to the granular material inside the box through the base material and the support member. Therefore, the granular material vibrates, causing friction between the granular materials and absorbing vibrational energy. In particular, low frequency vibrations can be effectively absorbed, and vibration energy can be absorbed to a large extent. Furthermore, since the side wall of the box is made of an elastic material, it vibrates in the horizontal direction in response to the vibration of the granular material. In other words, part of the vertical vibration is converted into horizontal vibration. Therefore, the vibrations transmitted to the slab are greatly attenuated in all frequency ranges, and almost no sound is radiated from the slab to the rooms downstairs, providing an extremely high sound insulation effect.

<Examples> The present invention will be described in detail below with reference to illustrated examples.

FIG. 1 is a sectional view of a floor structure showing a first embodiment of the present invention, where 1 is a slab and 2 is a cylindrical side wall 2.
a and a bottom plate 2b, and the inside thereof is filled with granular plastics 3, 3, ..., and 5 is a rubber box with a diameter of that of the box 2 at the end on the side that presses the granular plastics 3, 3, . A flange portion 6 slightly smaller than the inner diameter is a metal support member with a male screw portion 8 formed at the other end, 7 is a disc-shaped nut screwed into the male screw portion 8, and 10 is a metal support member that penetrates in the thickness direction. and a plurality of holes 1 into which the ends of the male threads 8 of the support member 5 are inserted.
1 is a base material supported by a nut 7 and made of wood or the like, and 12 is a finishing material affixed to the base material 10. The base material 10 includes a nut 7 and a support member 5.
and supported on the slab 1 by the granular plastics 3, 3, . . . . The supporting height of the base material 10 is adjusted by adjusting the nut 7 mentioned above. Further, a circular rubber cover 14 having a hole through which the support member 5 is inserted is attached to the upper end of the side wall 2a of the box 2, and the rubber cover 14 and the bottom plate 2
b strengthens the restoring force of the side wall 2a. Also, if the bottom plate 2b of the box body 2 is made of cushion material,
Can buffer impact force.

When vibrations are applied to the upper surface of the floor structure configured as described above, the following actions occur to prevent the vibrations from being transmitted to the slab and to prevent the generation of sound downstairs.

First, when vibration is transmitted to the finishing material 12, the vibration is transmitted to the base material 10. The vibrations are then applied to the nut 7, to the flange 6 of the support member 5, and subsequently to the granular plastic 3, which is pressed against the flange 6.
3. It is transmitted to... The plastic grains 3, 3, . . . that have been given vibrational energy vibrate, causing friction between the plastic grains and absorbing a portion of the vibrational energy. Furthermore, the side wall 2a of the rubber box 2 is deformed by the vibration of the granular plastics 3, 3, . . . , and the granular plastics 3, 3, . . . vibrate in accordance with this deformation. The vibration of the plastic is repeated by the restoring force after the rubber box 2 is deformed, so most of the vibration energy is converted into thermal energy due to the friction between the granular plastics 3, 3... and the internal friction of the rubber box 2. The vibration is absorbed and attenuated, and the vibration transmitted from the bottom of the box 2 to the slab 1 becomes minute. Furthermore, by deforming the side wall 2a of the box body 2, a portion of the vibration applied in the vertical direction is converted into vibration in the horizontal direction, so that the vibration transmitted to the slab 1 can be reduced. I can do it. Therefore, almost no sound is radiated from the slab 1 to the rooms below, and this floor structure exhibits an extremely high sound insulation effect.

An experiment was conducted to examine the vibration transmitted to the center of the slab using the floor structure of this example and a conventional floor structure. In the case of this example, the experimental conditions are that the rubber box 2 has an inner diameter of the side wall of 50 mm, a height of 50 mm, a thickness of 10 mm, and a hardness of 60°.
The diameter of the granular plastic 3 filled in the box is
It was 2.0mm. In addition, as a conventional floor structure, only a slab was used. In addition, a softball was allowed to fall freely from a height of 1.5 m and was used as an excitation source.

Figure 2 shows the experimental data. The solid line indicates the floor structure of this embodiment, and the broken line indicates the conventional floor structure. As is clear from this experimental data, the relative acceleration level of the conventional floor structure, especially in the frequency range centered around 63Hz, is approximately -
15dB, which is poor at blocking vibrations in the extremely low frequency range. On the other hand, in the floor structure of this example, the relative acceleration level is almost constant at less than -20 dB for any octave band center frequency,
It has been proven to have good isolation against floor impact noise in all frequency ranges.

In this way, according to this embodiment, the rubber box body 2
Due to the elasticity of the rubber box 2, the friction generated when the granular plastics 3, 3, ... filled in the rubber box 2 repeatedly move, converts the energy of sound vibrations generated on the upper floor into thermal energy. As demonstrated by the above experimental data, vibrations transmitted to the slab are greatly attenuated in all frequency ranges, and therefore the amount of sound radiated from the slab to the rooms downstairs is small. Become. Also,
According to this embodiment, the rubber lid member 14 is attached to the upper part of the side wall 2a of the rubber box body 2 to strengthen the restoring force after deformation.
There is an advantage that repetition of the movement of ... is ensured.

In addition, the floor structure of this embodiment does not require thick slabs as in the past, and has a simple structure of simply filling granular plastic in a rubber box, so it can be provided at low cost. Moreover, since there are no problems such as curing of the buffer layer, it can be easily assembled.

In the above embodiment, the side wall 2a of the rubber box 1 has a cylindrical shape, but it may have a rectangular cylindrical shape.

Although granular plastic was used as the granular material to be filled in the box 2, it may also be sand, fine stones, beads, etc. In short, it causes friction and the box 2
Any substance can be used as long as it can move according to the deformation of the material.

FIG. 3 shows a modification of the box body, and is a diagram of the modification seen from the floor material side. In the above embodiment, the box body 2
were independent from each other, but in this modification, a plurality of partitions 21 are formed of rubber material at regular intervals in a rectangular box 20 made of wood or the like. This box body 20 has the structure other than the box body 2 as it is in the floor structure shown in FIG.
used in place of. In this case, since the side wall 20a of the box body 20 also serves to strengthen the restoring force of the rubber partition 21, there is no need to provide a separate lid member 14 as in the above embodiment. Furthermore, since the partitions 21 are formed at regular intervals, there is an advantage that the part filled with particulate material can be easily positioned.

<Effects of the Invention> As is clear from the above, according to the floor structure of the present invention, vibrations generated on the upper surface of the floor are transmitted through the flooring material and the supporting member into the box body having the side walls formed of an elastic body. This granular material vibrates due to the elasticity of the side walls of the box, and the vibration energy is largely absorbed as thermal energy due to the friction generated during vibration. Some of the directional vibrations are converted into horizontal vibrations by the granular material and the side walls of the box, and the vibrations are greatly attenuated in all frequency ranges and are hardly transmitted to the slab. Therefore, almost no sound is radiated from the slab to the rooms downstairs, and an extremely high sound insulation effect can be achieved.

In addition, this floor structure does not require thick slabs as in the past, so it can be assembled easily at low cost and without problems such as curing of the buffer layer.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a floor structure according to an embodiment of the present invention, Fig. 2 is a diagram showing experimental data, and Fig. 3 is a plan view of a modified example of the box of the above embodiment as seen from the floor material side. It is. DESCRIPTION OF SYMBOLS 1... Slab, 2... Rubber box, 3... Granular plastic, 5... Supporting member, 6... Flange portion, 10... Floor base material, 12... Finishing material.

Claims (1)

[Claims] 1. A box body having a side wall made of an elastic material and filled with granular material, and a support member that presses the granular material with a flange provided at one end are arranged between the slab and the flooring material. and a floor structure in which the above-mentioned flooring material is supported by a support member and a granular material.