JP2000073550A - Floor vibration proofing device and sound proof double floor equipped with its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor vibration proofing device which can minimize a dynamic spring constant in a frequency band of 45-710 Hz due to two resonance phenomena, and is statically hard and dynamically soft. SOLUTION: In this floor vibration isolating device, a cylindrical sealed space 4 is formed inside an elastic body 3 inserted between a floor base material 1 and a floor foundation base 2. An axial one end face part of the elastic body 3 having formed a cylindrical sealed space 4 is a base material side face part 5 located on the side of the floor base material 1, and the other axial end part is a foundation base side face part 6 located on the side of the floor foundation base 2, and fluid 7 is enclosed in the sealed space 4. The sealed space 4 is axially divided into more than two rooms by a plate-shaped member 8 fixed to either of the sides of the base material side face part 5 or the foundation base side face part 6. An orifice 9 is formed between the outer periphery of the plate-shaped member 8 and the inside of a wall part of an elastic body 3. The plate-shaped member 8 is set so as to generate the natural frequency of 45-710 Hz in the case where an impact force acts on the floor vibration isolating device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor vibration isolator and a soundproof double floor provided with the floor vibration isolator.

[0002]

2. Description of the Related Art In recent years, double-floor floors have been rapidly spread in apartment houses and the like due to the ability to provide underfloor piping and good workability. This double floor, for example, the floor base material is configured by projecting support legs from a plurality of locations on the lower surface such as a plate-like material or a joist material,
The support legs are placed on a floor base such as a concrete slab and are laid so as to be adjacent to each other. In a double floor having such a structure, a vibration-proof rubber or the like is provided at the lower end of the support leg to ensure soundproofing against floor impact.

FIG. 12 shows an example of the soundproofing performance when a conventional anti-vibration rubber is used in a double floor as described above.

[0006] In FIG. 12, a line b represents a heavy floor impact sound level, which is also shown together with a sound insulation grade curve defined by JIS. The soundproofing performance of the floor impact sound is 63 to 125 Hz (1/1 octave) because the soundproofing grade is given when the sound insulation performance falls below a certain soundproofing grade curve at all frequencies. Band). The soundproofing performance for the light floor impact sound is determined at 250 to 500 Hz (1/1 octave band). Therefore, in order to further improve the soundproofing performance, these frequency ranges (63 to 500 Hz (1/1)
One octave band), this cutting frequency is 45-710
Hz) is indispensable. In a conventional double floor structure, a low-elastic vibration-proof rubber may be used in order to improve the soundproof performance in this area. FIG. 8 shows the force transmission characteristics in this case. In FIG. 8, the horizontal axis is frequency,
The vertical axis shows the transmission rate of the force from the floor base material to the floor base.
From FIG. 8, when a low-elasticity anti-vibration rubber is used, the natural frequency of the one-mass system composed of the floor substrate and the anti-vibration rubber becomes low, so that the frequency between 63 to 500 Hz (1/1 octave band) is used. It can be seen that the vibration isolation effect is increased in the frequency band, and the sound insulation performance against floor impact is improved. However, in the case of these low-elasticity vibration-isolating rubbers, the static spring constant is also small, so the rigidity of the entire floor is reduced, and the amount of sinking of the floor against a heavy object such as a bookcase or a piano becomes large, or when walking, There were problems such as shaking.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and uses a low-elastic vibration-proof rubber having a function of changing a static spring constant. Instead, the dynamic spring constant between 45 and 710 Hz, which is a problem in floor impact sound, is lowered by utilizing the resonance phenomenon of the fluid part and the natural frequency of the plate-like member, and a frequency region ( 63 to 500 Hz (1/1 octave band)
It is an object of the present invention to provide a floor vibration isolator and a soundproof double floor provided with a floor vibration isolator, which have particularly high soundproofing performance, and maintain good load resistance and walking feeling against heavy objects such as shelves and pianos. Things.

[0006]

In order to solve the above-mentioned problems, a floor vibration isolator according to the present invention comprises a floor substrate 1 made of a plate-like material, a joist or a supporting leg and a floor base made of a concrete slab. A floor vibration isolator in which a cylindrical closed space 4 is formed inside an elastic body 3 interposed between the elastic body 3 and one end surface in the axial direction of the elastic body 3 forming the cylindrical closed space 4 Is a substrate side surface portion 5 located on the floor substrate 1 side, and the other end in the axial direction becomes a substrate side surface portion 6 located on the floor substrate 2 side. The enclosed space 4 is divided into two or more chambers in the axial direction by a plate member 8 fixed to one of the side 5 and the base side surface portion 6.
In the floor vibration isolator in which the orifice 9 is formed between the outer circumference of the elastic member 3 and the inner surface of the wall of the elastic body 3, the natural frequency of 45 to 710 Hz is applied to the plate member 8 when an impact force is applied to the floor vibration isolator. It is characterized by being set to occur. With such a configuration, when an impact input is received, the elastic body 3 is deformed, the plate member 8 moves, and the closed space 4
The fluid 7 in the main chamber 12, which is one of the chambers partitioned by the plate member 8, is compressed, the internal pressure rises, and the position of the orifice 9 moves with the movement of the plate member 8, whereby The compressed fluid 7 in the main chamber 12 moves to the sub-chamber 13 which is one of the chambers partitioned by the plate member 8 in the closed space 4. At this time, a resonance phenomenon occurs in which the elastic body 3 is a spring and the fluid 7 of the orifice 9 is a mass, and the resonance phenomenon of the fluid 7 and 45% are applied to the plate member 8 when an impact force is applied to the floor vibration isolator. A dynamic spring constant in a frequency range of 45 to 710 Hz can be reduced by two resonance phenomena, that is, a resonance phenomenon caused by generation of a natural frequency of up to 710 Hz.

Preferably, the natural frequency of the plate member 8 is the natural bending frequency of the plate member. With such a configuration, the dynamic spring constant in the frequency range of 45 to 710 Hz can be reduced.

Further, a projection structure 8a is projected from the outer periphery of the plate member 8 to an orifice 9 formed between the outer periphery of the plate member 8 and the inner surface of the wall of the elastic body 3, thereby forming the projection structure. It is preferable to set the natural frequency of 8a to 45 to 710 Hz. With such a configuration, 45 to 710
The dynamic spring constant in the frequency range of Hz can be reduced.

The plate-like member 8 has a protruding elastic body provided on one of the base side surface portion 5 and the base side surface portion 6, and the base material side surface portion 5 or the base side surface portion is provided by the protruding elastic body. It is preferable that the natural frequency of a resonance system fixed to any one of the members 6 and having the plate-shaped member 8 as a mass and the protruding elastic body as a spring be set to 45 to 710 Hz. With such a configuration, the dynamic spring constant in the frequency range of 45 to 710 Hz can be reduced.

It is preferable to set the natural frequency related to the radial vibration mode of the wall of the elastic body 3 to 45 to 710 Hz. With such a configuration, 45 to 7
The dynamic spring constant in the frequency range of 10 Hz can be reduced.

Further, of the two chambers divided by the plate member 8 fixed to one of the base member side surface portion 5 and the base member side surface portion 6, the elastic member is provided on the side of the chamber to which the plate member 8 is not fixed. It is preferable to provide an anti-sinking portion 20 which is connected to the inner surface of the body 3 and has elasticity to prevent the plate-shaped member 8 from sinking. With such a configuration, it is possible to prevent the plate member 8 from sinking.

Further, the soundproof double floor of the present invention is characterized in that the floor vibration isolator A according to any one of claims 1 to 6 is replaced with a floor base material 1 made of a plate-like material, a joist or a support leg. And a floor base 2 such as a concrete slab. With such a configuration, a frequency region (63 to 500 Hz (1/1 octave band)) which is important for floor impact sound countermeasures
By reducing the dynamic spring constant at the time by two resonance phenomena, high soundproof performance against floor impact noise can be obtained while maintaining good load resistance and walking ability against heavy objects such as shelves and pianos. Will be.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the accompanying drawings.

FIG. 1 shows an embodiment of a floor vibration isolator A of the present invention. A cylindrical closed space 4 is formed inside an elastic body 3 made of natural rubber, synthetic rubber, elastic synthetic resin, or the like, and a fluid 7 is sealed in the closed space 4. Examples of the fluid to be used include water, silicone oil, alkylene glycol, polyalkylene glycol, silica gel, a surfactant, a fluid obtained by mixing powder with these fluids, or a powder having fluidity. . One end face in the axial direction of the elastic body 3 forming the cylindrical closed space 4 becomes a base material side face part 5 located on the floor base material 1 side made of a plate-like material, a joist material, a support leg, or the like. Is a base side surface portion 6 such as a concrete slab located on the floor base 2 side. A projecting structure 15 projects in the axial direction from one of the base material side surface portion 5 and the substrate side surface portion 6 toward the inside of the sealed space 4, and a tip of the projecting structure 15 in the sealed space 4. A plate-shaped member 8 having a plate shape is fixed to the portion, and the sealed space 4 is divided into two or more chambers in the axial direction by the plate-shaped member 8. In the attached drawing, since the number of the plate-shaped members 8 is one, the closed space 4 is divided into two chambers. Here, of the two divided chambers, the chamber formed between the plate-shaped member 8 and the surface of the base material side surface 5 or the base side surface 6 to which the plate-shaped member 8 is fixed is a sub-chamber. The room formed between the plate member 8 and the surface on which the plate member 8 is not fixed is the main chamber 12. An orifice 9 is formed between the outer periphery of the plate member 8 and the inner surface of the wall of the elastic body 3. In the present invention, when an impact force is applied to the floor vibration isolator A having the above-described configuration, 45 to 45
It is set so that a natural frequency of 710 Hz is generated.

The floor vibration isolator A having the above-described structure is provided between the floor base 1 and the floor base 2 and receives an impact from the floor base 1 or the floor base 2 when the shock is input. Used to reduce the propagation of shock by floor vibration isolators. Hereinafter, a soundproof double floor provided with the floor vibration isolator of the present invention will be described.

That is, a plurality of floor vibration isolators A having the above-described structure are interposed between the lower surface of a floor base material 1 made of a plate-like material, a joist material, support legs, and the like, and a floor base 2 such as a concrete slab. Thus, a double floor as shown in FIGS. 2A and 2B is formed. Here, the base material side surface portion 5 of the elastic body 3 constituting the main body of the floor vibration isolator A abuts or is fixed to the lower surface of the floor base material 1, and the base side surface portion 6 abuts on the upper surface of the floor base material 2. Contact (place) or be fixed. Of course, not only those directly contacting, but also those indirectly attached via other members may be used.

When the floor substrate 1 receives an impact force P as shown by an arrow in FIG. 1B, the elastic body 3 is deformed, the plate member 8 moves, and the plate member 8 moves. The fluid 7 in the main chamber 12, which is the direction of movement of the chamber 8, is compressed and the internal pressure rises, and the position of the orifice 9 changes, so that the compressed fluid 7 in the main chamber 12 flows through the orifice 9 in the opposite direction. Room 1
Go to 3. At this time, a resonance phenomenon in which the elastic body 3 is a spring and the fluid 7 in the orifice 9 is a mass, and a resonance phenomenon relating to the plate member 8 as shown in FIG. By tuning each resonance frequency to a specific frequency (45 to 710 Hz) as shown by the line b in FIG.
The dynamic spring constant can be reduced. By the way, the resonance frequency f0 of the orifice 9 portion is k (N / m), the expansion spring constant that spreads in the direction perpendicular to the load direction when a load is applied to the floor vibration isolator A with the orifice closed, and the elastic body 3 The sectional area of the closed space 4 formed by
(M ² ), the axial length of the orifice 9 is L (m), the sectional area of the orifice 9 is A0 (m ² ), and the density of the sealed fluid 7 is ρ (kg / m ³ ). Given by

F0 = (A0 × k / (A1 × A1 × ρ ×
L)) ^1/2 / (2π) Note that the line a in FIG. 10 shows the characteristics of the conventional anti-vibration rubber.

On the other hand, when an impact is applied to the floor substrate 1, the frequency characteristic of the transmission force to the floor base 2 is determined by the product of the floor material displacement and the dynamic spring constant for each frequency. For this reason, as shown by the line b in FIG.
If the dynamic spring constant in the interval (1/1 octave band) can be reduced, the line b in FIG.
As described above, in addition to the conventional anti-vibration effect (line a in FIG. 9), it is possible to further reduce the transmissibility, and to provide a sound-absorbing performance between 63 and 500 Hz (1/1 octave band), which is a problem in floor impact sound. Is also improved.

The floor vibration isolator A of the present invention uses the low-elastic vibration-isolating rubber having the function of changing the static spring constant without using the resonance phenomenon of the enclosed fluid 7 and the bending of the plate member 8. Natural frequency of 45 to 710H
By tuning to z, the dynamic spring constant in that frequency range can be reduced, so that high soundproof performance against floor impact can be obtained while maintaining good load-bearing performance and walking feeling. .

Next, an embodiment of the present invention will be described with reference to FIG. Although the basic configuration in this embodiment is the same as that shown in FIG. 1 described above, in this embodiment, when the impact force P is applied to the floor vibration isolator A,
In setting such that a natural frequency of 45 to 710 Hz is generated, the characteristic frequency of the plate member 8 is set as the natural bending frequency of the plate member 8.

That is, in the present embodiment, the natural bending vibration f1 of the plate member 8 is used, and the natural bending frequency f1 of the plate member 8 is generally well known. When the member 8 is a circular plate, the Young's modulus of the plate member 8 is E (N / m ² ), the thickness is h (m), and the radius is a.
(M), the density is ρ (kg / m ³ ), and the Poisson's ratio is ν.

F1 = α (D / (ρh)) ^1/2 / (2π
^{a 2), D = Eh 3} /12 (1-ν 2) where, alpha is a constant determined by such ambient conditions of the circular plate.

In the present embodiment, the natural bending vibration of the plate member 8 is added to the resonance phenomenon at the orifice 9 portion, and it has two resonance frequencies (which may coincide with each other). By tuning, the dynamic spring constant in that frequency range can be reduced.

Next, another embodiment of the present invention will be described with reference to FIG. The embodiment shown in FIG. 4 has the same basic configuration as that shown in FIG. 1, and thus redundant description will be omitted, and different points will be described below.

In this embodiment, when an impact force P is applied to the floor vibration isolator A, the plate-like member 8 has 45-710H.
In setting so as to generate a natural frequency of z, a protruding structure is formed on the orifice 9 formed between the outer periphery of the plate member 8 and the inner surface of the wall of the elastic body 3 from the outer periphery of the plate member 8. The body 8a is projected, and the natural frequency of the projection structure 8a is set to 45.
The characteristic is that the natural frequency of the protruding structure 8a is used by setting the frequency to 710 Hz.

The natural frequency f2 can be considered variously, for example, due to spring-mass system resonance, film vibration, and the like. For example,
In the case of a spring-mass system resonance phenomenon, the mass of the projecting structure 8a applied to the periphery of the plate member 8 is m ₂ (kg), and the spring of the projecting structure 8a is k ₂ (N / m). Is represented by the following equation.

F2 = (k ₂ / m ₂ ) ^1/2 / (2π) In addition to the resonance phenomenon at the orifice 9, the projection structure 8a
Resonance phenomena due to the resonance of the spring-mass system, membrane vibration, etc., occur, and have two resonance frequencies (which may be the same), and by tuning them to 45 to 710 Hz, the dynamic spring constant at that frequency Is added.

Next, another embodiment of the present invention will be described with reference to FIG. The embodiment shown in FIG. 5 has the same basic configuration as that shown in FIG. 1, and thus redundant description will be omitted, and different points will be described below.

In this embodiment, when an impact force P is applied to the floor vibration isolator A, the plate-like member 8 has 45 to 710H.
In setting so that a natural frequency of z is generated, the plate-like member 8 is provided with a protruding elastic body that becomes the protruding structure 15 on one of the side surface of the base material and the side surface of the base. Then, a resonance system is used, which is fixed to one of the side surface of the base material and the side surface of the base by the projection-like elastic body, and uses the plate-like member 8 as a mass and the projection-like elastic body as the projection-like structure 15 as a spring. It is characterized by doing. Its resonance frequency f3
Is expressed by the following equation, where m is the weight of the plate-shaped member 8 and k is the spring of the protruding elastic body that is the protruding structure 15.

F3 = (k / m) ^1/2 / (2π) In the resonance phenomenon at the orifice 9 portion, the mass of the plate member 8 is used as a mass, and the projecting elastic body as the projecting structure 15 is used as a spring. Have one degree of freedom, and have two resonance frequencies (which may be the same).
By tuning to, the dynamic spring constant in that frequency range can be reduced.

Next, still another embodiment of the present invention will be described with reference to FIG. The embodiment shown in FIG. 6 has the same basic configuration as that shown in FIG. 1, and thus duplicate description will be omitted, and different points will be described below.

In this embodiment, when an impact force P is applied to the floor vibration isolator A, the plate-like member 8 has 45 to 710H.
In setting the natural frequency of z to be generated, the natural frequency related to the radial vibration mode of the wall of the elastic body 3 due to the deformation caused by the impact of the elastic body 3 itself is used. There is a feature in doing. The natural frequency related to the vibration mode is determined by the material of the elastic body, the expansion spring constant, the thickness, and the like. Thus, in addition to the resonance phenomenon at the orifice 9 portion, by having this natural frequency, it has two resonance frequencies (which may coincide with each other).
Tuning to ７710 Hz has the effect of reducing the dynamic spring constant in that frequency range.

Next, still another embodiment of the present invention will be described with reference to FIG. The embodiment shown in FIG. 7 has the same basic configuration as that shown in FIG. 1, and thus redundant description will be omitted, and different points will be described below.

In this embodiment, of the two chambers divided by the plate-shaped member 8 fixed to one of the side surface of the base material and the side surface of the base, the chamber side to which the plate-shaped member 8 is not fixed is selected. The plate-like member 8 is connected to the inner surface of the elastic body 3.
An anti-sinking portion 20 having elasticity for preventing the sinking of the sword is provided. As described above, by providing the elastic submersion preventing portion 20, when the plate-shaped member 8 moves as described above under a load from above and hits the elastic submersion preventing portion 20, It is possible to realize the floor vibration isolator A which is harder against a static load than the state where only the fluid 7 is sealed.

The floor vibration isolator A of the present invention shown in each of the above-described embodiments constitutes a soundproof double floor by being interposed between the floor base material 1 and the floor base 2. The soundproof double floor constructed as described above is statically hard and dynamically realizes a low spring between 63 and 500 Hz (1/1 octave band) which is a problem due to floor impact noise. It can be a floor.

[0037]

Embodiments of the present invention will be described below.

FIG. 2B is a sectional view showing the structure of the soundproof double floor of this embodiment. In this embodiment, the floor substrate 1
The floor base material 1 is formed by laminating a surface finishing material 1b on an upper surface of the floor base material 1a and providing a support leg 1c on a lower surface of the floor base material 1a, and a floor vibration isolator on the lower surface of the support leg 1c of the floor base material 1. A is abutted and fixed, and the floor vibration isolator A is mounted on a floor base 2 made of a concrete slab to form a double floor.

Here, a particle board having a thickness of 20 mm is used as the floor base material 1a, a wooden floor having a thickness of 12 mm is used as the surface finishing material 1a, and 6 mm is used as the support leg 1c.
Nylon legs are used. And the supporting leg 1c is 61
Arranged at 0mm pitch, floor height is 150m
m.

(Example 1) In the double floor having the configuration shown in FIG. 2B, the floor vibration isolator A shown in FIG. 3 was used. The size of this floor vibration isolator A is 50 m in height.
m, a cylindrical shape having an outer diameter of 50 mm, a natural rubber having a hardness of 47 degrees is used as the elastic body 3 constituting the main body, and the main spring constant elastically supporting in the load direction excludes the fluid 7. The expanded spring constant that expands in the direction perpendicular to the load direction is 1.0 × 10 ⁴ (N / m) when the orifice 9 is closed, and 9.0 × 10 ⁴ (N / m) when the orifice 9 is closed. Main room 1
2 has a diameter of 38 mm and a height of 10 mm, and the sub-chamber 13 is a cylindrical space having an inner diameter of 38 mm and a height of 10 mm. Water was used as the fluid 7 to be sealed in the closed space 4.
The plate-shaped member 8 is made of columnar lead having a thickness of 1 mm and a diameter of 35 mm, and is provided at the center as shown in FIG. The plate-shaped member 8 is provided on the side surface portion 5 of the base material,
5 fixed. At this time, the natural frequency of the plate member 8 itself is 220 Hz.

Example 2 In the double floor having the structure shown in FIG. 2B, the floor vibration isolator A shown in FIG. 3 was used. This floor vibration isolator A has the configuration described in the embodiment of FIG. 3, and as the plate member 8, a cylindrical hard vinyl chloride plate having a diameter of 35 mm and a thickness of 1.2 mm is used.
The Young's modulus of the plate member 8 is 3.5 × 10 ⁹ (N /
m), density 1370 (kg / m ³ ), Poisson's ratio 0.2
8 At this time, the constant α is 5, 25 in the case of free peripheral.
The natural frequency f1 of the plate vibration is about 320 Hz. Others are the same as the first embodiment.

(Embodiment 3) In the double floor having the structure shown in FIG. 2B, the floor vibration isolator A shown in FIG. 4 was used. The floor vibration isolator A has the configuration described in the embodiment of FIG. 4, and the plate member 8 has a diameter of 12 mm and a thickness of 5 mm.
A protruding structure 8a made of a rubber sheet having a hardness of 50 degrees and a length of 2 mm in the circumferential direction of the plate-shaped member 8 was additionally provided. Projection structure 8 made of this rubber sheet
The natural frequency of a is 60 Hz. Further, since the plate member 8 is made of steel, it is rigid, and its natural frequency is tens of thousands of H.
z and can be ignored. Others are the same as the first embodiment.

(Embodiment 4) In the double floor having the structure shown in FIG. 2B, the floor vibration isolator A shown in FIG. 5 was used. The floor vibration isolator A has the configuration described in the embodiment of FIG. 5, and the plate-shaped member 8 is a columnar steel having a diameter of 30 mm and a thickness of 20 mm. The projection-like elastic body, which is the projection-like structure 15, has a spring constant of 2.7 × 10 ⁵ N.
/ M, whereby a natural frequency of 250 Hz is generated in the plate member 8 when an impact force is applied to the floor vibration isolator A. The plate member 8 itself is rigid because it is made of steel, and its natural frequency is tens of thousands Hz, and the natural frequency of the plate member 8 itself can be ignored. Others are the same as the first embodiment.

(Embodiment 5) In the double floor having the configuration shown in FIG. 2B, the floor vibration isolator A shown in FIG. 6 was used. The floor vibration isolator A has the configuration described in the embodiment of FIG. 6. The inner diameter of the main chamber 12 and the sub chamber 13 is 42 mm, and the wall thickness of the elastic body 3 is 4 mm. Here, the elastic body 3
Has a Young's modulus of 4.6 × 10 ⁶ Pa and a natural frequency of 250 Hz. Others are the same as the first embodiment.

(Embodiment 6) In the double floor having the structure shown in FIG. 2A, the floor vibration isolator A shown in FIG. 7 was used. The floor vibration isolator A has the configuration described in the embodiment of FIG. 7, and has an elastic submerged surface on the surface of the elastic body 3 that faces the plate member 8 of the main chamber 12 below the plate member 8. The prevention part 20 has a diameter of 20 mm, a thickness of 10 mm, and a density of 16
(Kg / m ³ ) of soft urethane was provided. Other configurations are the same as those of the first embodiment. The other is the same as the first embodiment.

In the first to sixth embodiments, the resonance frequency of the orifice 9 is in the range of 45 to 750 Hz.

FIG. 12 shows the heavy floor impact sound level of the soundproof double floor using the floor vibration isolator A of the second embodiment shown in FIG. 3 and the conventional rubber rubber. The line indicates the level of the soundproof double floor impact sound of Example 2, and the line b in FIG. 12 indicates the level of the heavy impact sound of the soundproof double floor when the conventional rubber is used. FIG. 11 shows the dynamic spring constant when the floor vibration isolator A according to the second embodiment shown in FIG. 3 and the conventional rubber is used. The line a shows the embodiment 2 and the line b shows the conventional. ing. FIG. 11 shows that the dynamic spring constant is particularly small at the two resonance frequencies. It can be seen from FIG. 12 that the soundproof double floor has an improved floor impact sound level in a low sound range of 500 Hz or less.

Further, each of the first, third, fourth, fifth and sixth embodiments is also substantially similar to that of FIG.
A result similar to that of Example 2 indicated by the line a in FIG. 12 was obtained.

[0049]

According to the first aspect of the present invention, as described above, the distance between the floor base made of a plate-like material, a joist or a support leg and the floor base made of a concrete slab is as described above. A cylindrical closed space is formed inside the elastic body interposed therebetween, and one end surface in the axial direction of the elastic body forming the cylindrical closed space is a base material side surface portion located on the floor base material side and the shaft. The other end in the direction becomes the base side surface located on the floor base side, encloses the fluid in the sealed space, and is closed space by a plate-shaped member fixed to one of the base material side surface or the base side surface. Is divided into two or more chambers in the axial direction, and an orifice is formed between the outer periphery of the plate-shaped member and the inner surface of the wall of the elastic body. When an impact force is applied to the floor vibration isolator, This is set so that a natural frequency of 45 to 710 Hz is generated in the shape member. The dynamic spring constant in the frequency domain 2
It is possible to obtain a floor vibration isolator which can be reduced by two resonance phenomena, is statically hard and is dynamically soft.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the natural frequency of the plate-shaped member is the natural bending frequency of the plate-shaped member. With such a configuration, the dynamic spring constant in this frequency region can be reduced by two resonance phenomena, and a floor vibration isolator which is hard in static and soft in dynamic can be obtained.

According to the third aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, a structure is provided between the outer periphery of the plate member and the inner surface of the wall of the elastic body. A protruding structure is protruded from the outer periphery of the plate-shaped member at the orifice portion to be formed, and the natural frequency of the protruding structure is set to 45 to 710 Hz. The spring constant can be reduced by two resonance phenomena, and a statically hard and dynamically soft floor vibration isolator can be obtained.

According to the fourth aspect of the present invention, in addition to the effects of the first to third aspects, the plate-shaped member is provided on the side surface of the base material or on the side surface of the base. A protruding elastic body is disposed on one of the sides, and the protruding elastic body is fixed to one of the substrate side surface and the base side surface by the protruding elastic body. Since the natural frequency of the resonance system is set to 45 to 710 Hz, the dynamic spring constant in this frequency region can be reduced by two resonance phenomena with a simple configuration, and is statically hard and dynamic. In general, a soft floor vibration isolator can be obtained.

According to a fifth aspect of the present invention, in addition to the effects of the first to fourth aspects, the present invention relates to a radial vibration mode of the wall of the elastic body. Since the natural frequency is set to 45 to 710 Hz, the dynamic spring constant in this frequency region can be reduced by two resonance phenomena with a simple configuration, and the floor is statically hard and dynamically soft. An anti-vibration device is obtained.

According to a sixth aspect of the present invention, in addition to the effects of the first aspect of the present invention, one of the side face of the base material and the side face of the base material is provided. Of the two chambers divided by the plate-shaped member fixed to the inner surface of the chamber to which the plate-shaped member is not fixed is connected to the elastic inner surface portion so as to prevent the plate-shaped member from sinking. The provision of the prevention portion further provides a hard floor vibration isolator that does not sink under static load.

According to a seventh aspect of the present invention, there is provided the floor vibration isolator according to any one of the first to fifth aspects, wherein the floor is made of a plate-like material, a joist, a supporting leg, or the like. Because a plurality of layers are interposed between the lower surface of the floor and a floor base such as a concrete slab, a dynamic spring constant in a frequency range (45 to 710 Hz) which is important for countermeasures against floor impact noise is obtained by two resonance phenomena. It is possible to obtain a high soundproofing performance against floor impact noise while keeping the load resistance and walking property for heavy objects such as shelves and pianos good while keeping it small.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing a floor vibration isolator of the present invention, and FIG. 1B is an operation explanatory diagram when an impact is received.

FIGS. 2A and 2B are cross-sectional views of one embodiment of a soundproof double floor provided with a floor vibration isolator.

FIG. 3 is a cross-sectional view of one embodiment of the present invention.

FIG. 4A is a cross-sectional view showing another embodiment of the present invention, and FIG. 4B is a model diagram of the same.

FIG. 5A is a cross-sectional view showing still another embodiment of the present invention, and FIG. 5B is a model diagram of the above embodiment.

FIG. 6 is a sectional view showing still another embodiment of the present invention.

FIG. 7 is a sectional view showing still another embodiment of the present invention.

FIG. 8 is a graph showing a vibration isolation effect in a conventional one-mass system.

FIG. 9 is a graph showing an image stabilizing effect of the present invention.

FIG. 10 is a graph showing a dynamic spring constant of the present invention.

FIG. 11 is a graph showing an absolute dynamic spring constant of the example of the present invention.

FIG. 12 is a graph showing a heavy floor impact sound level of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floor base material 2 Floor base 3 Elastic body 4 Enclosed space 5 Base material side part 6 Base side part 7 Fluid 8 Plate member 9 Orifice

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[Procedure amendment]

[Submission Date] November 30, 1998 (1998.11.
30)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction contents]

FIG. 2B is a sectional view showing the structure of the soundproof double floor of this embodiment. In this embodiment, the floor substrate 1
b , a floor base material 1 is formed by laminating a surface finishing material 1a on an upper surface, and a support leg 1c is provided on a lower surface of the floor base material 1b , and a floor vibration isolator is provided on a lower surface of the support leg 1c of the floor base material 1. A is abutted and fixed, and the floor vibration isolator A is mounted on a floor base 2 made of a concrete slab to form a double floor.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction contents]

Here, a particle board having a thickness of 20 mm is used as the base material 1b , a wooden floor having a thickness of 12 mm is used as the surface finishing material 1a, and 6 mm is used as the support leg 1c.
Nylon legs are used. And the supporting leg 1c is 61
Arranged at 0mm pitch, floor height is 150m
m.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Change

[Correction contents]

Example 2 In the double floor having the structure shown in FIG. 2B, the floor vibration isolator A shown in FIG. 3 was used. This floor vibration isolator A has the configuration described in the embodiment of FIG. 3, and as the plate member 8, a cylindrical hard vinyl chloride plate having a diameter of 35 mm and a thickness of 1.2 mm is used.
The Young's modulus of the plate member 8 is 3.5 × 10 ⁹ (N /
m), density 1370 (kg / m ³ ), Poisson's ratio 0.2
8 At this time, the constant α is 5.25 in the case of free periphery.
3, and the natural frequency f1 of the panel vibration is about 320 Hz. Others are the same as the first embodiment.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction contents]

(Embodiment 4) In the double floor having the structure shown in FIG. 2B, the floor vibration isolator A shown in FIG. 5 was used. This floor vibration isolator A has the configuration described in the embodiment of FIG. 5, and as the plate-like member 8, a columnar steel having a diameter of 30 mm and a thickness of 20 mm is used. The elastic constant of the projection-like elastic body, which is the projection-like structure 15, is 2.7 × 10 ^5.
N / m, whereby a natural frequency of 250 Hz is generated in the plate member 8 when an impact force is applied to the floor vibration isolator A. The plate member 8 itself is rigid because it is made of steel, and its natural frequency is tens of thousands Hz, and the natural frequency of the plate member 8 itself can be ignored. Others are the same as the first embodiment.

Continued on the front page (72) Inventor Hideyuki Ando 1048 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Works Co., Ltd.

Claims (7)

[Claims] 1. A cylindrical closed space is formed inside an elastic body interposed between a floor base such as a plate material, a joist or a support leg and a floor base such as a concrete slab. One end surface in the axial direction of the elastic body forming the cylindrical closed space is a base material side surface portion located on the floor base material side, and the other end portion in the axial direction is a base side surface portion located on the floor base material side. A sealed space is divided into two or more chambers in the axial direction by a plate-like member fixed to one of the side surface of the base material and the side surface of the base, and the outer periphery of the plate-like member and the elastic body are sealed therein. In the floor vibration isolator having an orifice formed between it and the inner surface of the wall, the plate-shaped member is set to generate a natural frequency of 45 to 710 Hz when an impact force is applied to the floor vibration isolator. A floor vibration isolator characterized by the above-mentioned. 2. The floor vibration isolator according to claim 1, wherein the natural frequency of the plate member is the natural bending frequency of the plate member. 3. An orifice portion formed between the outer periphery of the plate member and the inner surface of the wall of the elastic body projects the protrusion structure from the outer periphery of the plate member. 4
The floor vibration isolator according to claim 1 or 2, wherein the frequency is set to 5 to 710 Hz. 4. The plate-like member is provided with a protruding elastic body on one of a side surface of a base material and a side surface of a base, and the protruding elastic body is used to provide one of the side surface of the base material and the side surface of the base. A natural frequency of a resonance system fixed to one side and having the plate-shaped member as a mass and the projection-shaped elastic body as a spring is 45 to 710 Hz.
4. The method according to claim 1, wherein the setting is made as follows.
The floor vibration isolator according to any one of the above. 5. The floor defense according to claim 1, wherein a natural frequency related to a radial vibration mode of the wall portion of the elastic body is set at 45 to 710 Hz. Shaking device. 6. An elastic inner surface portion is connected to a chamber to which the plate-shaped member is not fixed among two chambers divided by a plate-shaped member fixed to one of the base material side surface and the base side surface. The floor vibration isolator according to any one of claims 1 to 5, further comprising an anti-subsidence portion having elasticity for preventing the plate-shaped member from submerging. 7. The floor vibration isolator according to any one of claims 1 to 6, wherein a lower surface of a floor base made of a plate-like material, a joist or a support leg, and a floor base such as a concrete slab. A soundproof double floor provided with a floor vibration isolator characterized by being interposed between a plurality of floors.