JPH0458865B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a vibration-proof floor for reducing the transmission of floor impact noises generated when children or the like jump on the floors of houses, especially apartment complexes, from being transmitted downstairs. It is related to materials.

(Prior Art) In recent years, floor impact noise from above floors in apartment complexes has become a major social problem. This floor impact sound is generated when the floor structure is vibrated by the impact caused by people walking or jumping, and the vibrations cause sound to be emitted from the subfloor facing downstairs. The above-mentioned floor impact noises can be roughly divided into those caused by light impacts such as footsteps, and those caused by heavy impacts (impact force 3875N) when children or the like jump. this house,
Floor impact noise caused by light impact can be easily solved by laying soft materials such as carpets and tatami mats on the floor surface to absorb and soften the impact force.

On the other hand, floor impact noise due to weight impact cannot be absorbed by surface materials such as carpets due to the large impact force, and no adequate solution has been found.
As measures to reduce floor impact noise caused by weight impact, there are known methods such as increasing the thickness of the floor slab and creating a floating floor structure. In other words, the increase in floor slab thickness in the former case is, for example, when the thickness of the floor slab is increased to 300 mm, which is twice the normal thickness, when an impact force of 3875 N is applied, compared to the case of a concrete floor slab with a thickness of 150 mm. Floor impact noise can be reduced by approximately 12dB. For reference, the sound insulation grade according to the floor impact sound level according to the Architectural Institute of Japan standards is L-
55, and if you live your life with care, even if the noise caused by impact is a little bothersome, you can reduce floor impact noise to a level that does not pose a problem. The latter floating floor construction method requires an upper floating floor layer (concrete thickness 50 mm) and a buffer layer (glass wool
96Kg/m ³ , thickness 25-50mm), the reduction effect is determined by the weight of the upper floating floor layer and the spring constant of the buffer material. The greater the weight of the upper floating floor layer and the smaller the spring constant of the cushioning material, the greater the effect. For reference, when the slab thickness is 150 mm and the spring constant of glass wool is 8 x 10 ⁶ N/m ³ , the sound insulation grade based on the floor impact sound level is L-50, and the floor impact noise is reduced to a level that is almost unnoticeable in daily life. .

(Problem to be Solved by the Invention) However, both of the above-mentioned conventional measures to reduce floor impact noise require increasing the concrete thickness of the floor, which increases the weight of the floor, making structural design difficult, especially in high-rise buildings. This method has disadvantages in that it is disadvantageous in terms of aspects and costs increase considerably.

Therefore, when considering the cause of the floor impact noise mentioned above, when receiving a weight impact force, this impact force is transmitted to the concrete floor slab, and the floor slab itself bends and vibrates due to this transmitted impact force. The vibration of the floor slab emits impact sound downstairs, but especially the sound caused by the vibration of the floor slab is because the natural vibration frequency of the concrete floor slab is in the low frequency range. In other words, the sound pressure in the low frequency range increases, and the floor impact sound in the high frequency range cannot be heard, but the sound in the low frequency range becomes louder, and as a result, the overall sound insulation performance deteriorates.

The present invention has been made in view of the above points, and its purpose is to provide a floor material with a vibration absorbing structure that utilizes the principle of a dynamic vibration absorber, thereby preventing weight impact from increasing without increasing the weight of the floor. The purpose is to reduce the vibration of the floor slab and reduce floor impact noise.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention provides a hollow panel having a hollow part and a hollow panel filled and fixed in the hollow part of the hollow panel as a vibration-proof flooring material. The structure is made up of an elastic body made of rubber or foamed plastic, etc., which has a spring constant smaller than that of the elastic body, and a high-density body made of metal, mineral, etc., encapsulated in the elastic body.

(Function) With the above structure, in the vibration-proof flooring material of the present invention, when an impact force is applied to the floor surface, the hollow panel deforms and tries to bend and vibrate, but the vibration is contained in the elastic body of the hollow part of the panel. Since the high-density body can move through the elastic body, when the impact force acts, the high-density body tries to stay in the same position due to inertia and deforms the surrounding elastic body,
A part of the impact force is consumed to cause this deformation, and as a result, the impact force directly acting on the subfloor is reduced, and the vibration of the subfloor is reduced and shortened.

Moreover, since the system of the elastic body and the high-density body acts as a dynamic vibration absorber against panel vibration, the spring constant of the elastic body and the mass of the high-density body are appropriately selected to reduce the natural vibration of the high-density body. By adjusting the frequency in advance, it is possible to configure a resonant system in a predetermined frequency range and absorb the vibration energy of the panel. Therefore, this vibration absorption effectively reduces impact noise. be able to. Furthermore, it is preferable to mix elastic bodies with different spring constants and high-density bodies with different masses in one panel, since vibrations of a plurality of frequencies can be absorbed simultaneously.

(First Embodiment) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 shows a vibration-proof floor material A according to the first embodiment of the present invention.
This figure shows a floating floor structure using In the figure, 1 is a subfloor made of concrete slab etc.
A glass wool mat 2 is disposed on the floor substrate 1 as a cushioning material, and the glass wool mat 2
A plurality of vibration-proof flooring materials A, A are stretched and connected to each other on the top, and a floor finishing material 3 such as a carpet is placed on the vibration-proofing flooring material A to form a floating floor structure. ing.

As shown in detail in FIG. 1, the above-mentioned vibration-proof flooring material A includes a hollow panel 5 in which hollow parts 4 penetrating the inside are formed in a horizontal line, and a hollow part 4 in the hollow panel 5. Filled and fixed elastic body 6 and the elastic body 6
A suitably shaped high-density body 7 embedded and contained therein
It is composed of: Above hollow panel 5
are cement, calcium silicate, ALC, plaster,
It consists of an extrusion-molded panel formed by extrusion-molding wood chips, synthetic resin, etc., with a hollow part 4 formed inside. Further, the elastic body 6 is made of an elastic material having a smaller spring constant than the material of the hollow panel 5, such as rubber, foamed plastic, or various fibers.
Further, the high-density body 7 is made of metal (iron, lead, etc.) or mineral (rock, sand, etc.) with a specific gravity of 2.0 or more,
The shape is a cube such as a sphere or a block, a plate-like body such as a square piece, or a columnar body such as a cylinder, and is discontinuously dispersed and contained in the elastic body 6 along the hollow part 4. Alternatively, it is made of a long material such as a rod or a strip, and is disposed in the form of being continuously enclosed in the elastic body 6 along the hollow portion 4 .

Therefore, when an impact force is applied to the floating floor structure configured in this way, the vibration-proof flooring material A is deformed and the vibration-proofing flooring material A (hollow panel 5) tends to bend and vibrate. . However, in the vibration-proof flooring material A, the high-density body 7 is placed in the hollow part 4 of the hollow panel 5, and the elastic body 6
When the impact force is applied, the high-density body 7 tries to stay in the same position due to inertia and moves the surrounding elastic body 6. A part of the impact force is consumed to deform the elastic body 6, and the impact force directly acting on the floor substrate 1 becomes smaller. When the vibration-proof flooring material A generates bending vibration due to the impact force, the above action continues while this vibration occurs, and a part of the energy due to the bending vibration of the vibration-proofing flooring material A is transferred to a high density. It continues to be consumed by the displacement of the body 7 and the deformation of the elastic body 6,
The vibration of the vibration-proof floor material A itself is reduced and shortened.

Moreover, since the high-density body 7 is provided in the hollow part 4 of the hollow panel 5 and enclosed in the elastic body 6, the elastic body 6 and the high-density body 7 are The system constitutes an auxiliary vibration system and works as a dynamic vibration absorber, so the spring constant of the elastic body 6 and the mass of the high-density body 7 are adjusted so that the high-density body 7 resonates at the natural vibration frequency of the panel 5. By setting it appropriately, it is possible to efficiently attenuate the vibrations of the panel 5 and reduce the sound emitted by the vibrations of the subfloor.

Furthermore, the elastic body 6 in the hollow part 4 of the hollow panel 5 may have a different spring constant, the high-density body 7 in the hollow part 4 may have a different mass as shown in FIG. By mixing sub-vibration systems with different natural vibration frequencies in one hollow panel 5, such as by mixing high-density bodies 7 with different masses in one hollow part 4 as shown,
If the high-density body 7 is made to resonate in a wide frequency range, it is also possible to absorb vibrations of a plurality of frequencies at the same time. Incidentally, light impact force such as footsteps can be easily absorbed by using a carpet, tatami, or the like as the floor finishing material 3.

Now, specifically, by extrusion molding, the specific gravity of the real part is
1.4. Create a hollow panel made of fiber-mixed cement material with a thickness of 70 mm and a hollow ratio of 50%, and in the hollow part, a soft urethane foam (20 times foamed, cross section 80 x After applying adhesive to the surface of the 44mm), it was inserted to create a vibration-proof flooring material. This anti-vibration flooring material is made of concrete slab (density
2300Kg/m ³ , thickness 150mm, dimensions 5700 x 4675mm) on top of glass wool cushioning material (96Kg/m ³ , thickness 40mm)
to create a floating floor, and
When the floor impact sound level was measured from downstairs using a weight impact sound generator specified in JIS-A1418, the floor impact sound was not noticeable at all, and the sound insulation of L-45 according to the Architectural Institute of Japan standards. Obtained performance (special grade). For comparison, concrete (density 2300 kg/m ³ , thickness 70 mm) was poured onto the above concrete slab via glass wool cushioning material to create a floating floor using the conventional wet method. As a result of measuring the impact sound level, the floor impact sound was a little worrisome, and the sound insulation performance was L-50 (grade 1) according to the standards of the Architectural Institute of Japan. Therefore, it can be seen that in the example of the present invention, the vibration is lowered by 5 dB than in the conventional example, and an excellent vibration damping effect can be obtained.

(Second Example) FIG. 3 shows a vibration-proof flooring material according to a second example of the present invention.
The floor structure using A′ is shown. As shown in FIG. 4, the vibration-proof flooring material A' has a hollow panel 5 that connects the front and back surface materials 5a, 5a with a large number of block-like materials 5b... It consists of an assembled panel in which a hollow part 4 penetrating the hollow panel 5 is formed in a lattice shape, and an elastic body 6 is inserted and fixed in the hollow part 4 of the hollow panel 5. The body 7 is contained in a state in which it is elastically supported so that it can move up and down. Furthermore, the end of the high-density body 7 protrudes from the end surface of the hollow panel 5, and the protruding end of the high-density body 7 corresponds to the high-density body 7 of the adjacent hollow panel 5.
It is connected to the end of the body by welding, a connecting body, etc.
In FIG. 3, reference numeral 10 is a rigid plate stretched over the vibration-proof flooring material A, and the floor finishing material 3 consists of a floorboard and a carpet provided thereon.

In the case of this example, in particular, since the high-density body 7 is connected to the high-density body 7 of the adjacent hollow panel 5 and becomes elongated, its natural vibration frequency shifts to the lower frequency side, so that the panel 5 20, so that the resonant frequency of the dynamic vibration absorber cannot be felt audibly without making it a large version.
It is also possible to set it to a low frequency range below Hz,
The vibration energy of the panel itself due to floor impact can be consumed and absorbed as extremely low frequency vibration energy without increasing the panel size. Furthermore, since the panel size can be small, the handling and workability of the panel 5 will not be degraded, and construction can be carried out easily and at low cost.

(Modification) As shown in FIGS. 5 and 6, the hollow panel 5 is formed by connecting the front and back surface materials 5a and 5a with a slat material 5b, and forming the hollow portion 4 in a horizontal row in one direction. As an assembled panel, each rod-shaped high-density body 7 contained in the elastic body 6 in the hollow part 4 is connected to the high-density body 7 of another adjacent hollow panel 5 with their ends mutually in one direction only. They may be connected.

In this case, as shown in FIG. 9, by using a wooden board such as plywood, particle board, fiber board, or wood cement board as the face material 5a of the assembled hollow panel 5, it is possible to nail the finishing material to the top surface. In addition to making construction easier by
The bending rigidity of the entire panel 5 may be increased by molding it with a metal mold material such as an I-channel or an FRP mold material. Further, as shown in FIG. 10, a reinforcing plate 5c such as a metal plate or an FRP plate is integrally provided on the surface of the wooden panel 5a, and a metal or
The bending rigidity of the entire panel 5 may be increased by using a wooden beam covered with a reinforcing material 5d such as FRP or plastic. By increasing the bending rigidity of the entire hollow panel 5 in this way, the impact force on the panel 5 can be increased.
The bending deformation of is reduced, the impact force acts uniformly on the entire panel 5, and the high-density body 7 in the hollow part 4 is
Since it is possible to uniformly vibrate not only the excitation point but also the entire panel 5, the high-density body inside the panel vibrates uniformly, which is preferable because the vibration is damped more quickly.

Further, as shown in FIG. 7, a male part 5e is provided at one end of the hollow panel 5 facing each other, and a female part 5f into which the male part 5e can fit is provided at the other end.
The panels 5, 5 can be easily and quickly joined together, and the high-density bodies 7, 7 of the adjacent hollow panels 5, 5 are connected via the connecting fittings 8, so that the floor surface It may be possible to increase the overall rigidity and prevent unevenness between the panels.

Furthermore, the high-density body 7 may be a strip-shaped plate-shaped body as shown in FIG. 8, in addition to a rod-shaped body. In this case, in addition to the connection method by welding, the ends of the high-density bodies 7 can be overlapped and connected by a simple means such as bolts.

(Effects of the Invention) As explained above, according to the vibration-proof flooring material of the present invention, an elastic body containing a high-density body is provided in the hollow part of the panel to act as a dynamic vibration absorber. , it is possible to effectively absorb the vibration of the panel due to impact and reduce the vibration of the entire panel.
In particular, since the vibration energy of the panel is absorbed by the resonance of the high-density body, the sound emitted from the subfloor is reduced, making it possible to significantly reduce the propagation of floor impact sound downstairs. Therefore, it is possible to easily and inexpensively prevent floor impact noise from propagating to the lower floors without significantly increasing the weight of the floor, and it is possible to provide a flooring material suitable for high-rise buildings.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the invention, FIG.
FIG. 2 is an enlarged vertical cross-sectional view of the main part of the vibration-proof flooring material of the example, and FIG. 2 is a vertical cross-sectional view of the construction state. FIG. 3 is a longitudinal sectional view of the second embodiment, and FIG. 4 is a perspective view of the vibration-proof flooring. FIG. 5 is a perspective view showing a modification, and FIG. 6 is a partially cutaway perspective view of the vibration-proof flooring. 7th
The figure and FIG. 8 are a sectional view and a partial perspective view showing other modifications, respectively. Figures 9 and 10
The figures are a sectional view and a partially enlarged sectional view showing modified examples, respectively. A, A'...Vibration-proof floor material, 4...Hollow part, 5...
Hollow panel, 6... elastic body, 7... high density body.

Claims (1)

[Scope of Claims] 1. A hollow panel having a hollow part, an elastic body made of rubber or foamed plastic, etc., which is filled and fixed in the hollow part and has a spring constant smaller than that of the hollow panel, and which is enclosed in the elastic body. A vibration-proof flooring material comprising a high-density body made of metal, mineral, etc. 2. The vibration-proof flooring material according to claim 1, wherein the high-density body is formed into a cube, a columnar body, or a plate-like body, and is discontinuously dispersed and included in the elastic body. 3. The vibration-proof flooring material according to claim 1, wherein the high-density body is made of a long material such as a rod or a strip and is continuously enclosed within the elastic body. 4. The vibration-proof flooring material according to claim 3, wherein the end of the high-density body made of the elongated material protrudes from the end face of the hollow panel so as to be able to connect with the high-density body of another hollow panel. 5. The vibration-proof flooring material according to claim 1, 2, 3, or 4, wherein the hollow panel is an assembled panel in which the front and back surface materials are connected by a timber or block-like material. 6. The vibration-proof flooring material according to claim 5, wherein the beam is formed of a rigid profile material such as metal or FRP. 7. The vibration-proof flooring material according to claim 1, 2, 3, or 4, wherein the hollow panel is an extrusion-molded panel in which a hollow portion is provided by extrusion-molding cement or wood chips, etc. .