JPH0893850A - Vibration isolating rubber - Google Patents

Abstract

PURPOSE: To provide a vibration isolating rubber having sufficient strength and vibration isolating performance in both the horizontal and vertical directions and capable of optionally changing a ratio of spring constants in respective directions. CONSTITUTION: In a receiving part of a lower mounting metal fitting 11 formed by combining a U-shape cross section metal fitting 8 with an L-shape cross section metal fitting 9, a square column shape upper mounting metal fitting 13 having a tapped hole at the center is arranged in such a manner that its upper face 13a is parallel to a bottom of the metal fitting 11 and slightly higher than an upper peripheral edge surface thereof. In a space between the upper and lower metal fittings 13, 14, a rubber elastic body 14 made of rubber material filled and vulcanized-molded is arranged, and in the lower side peripheral edge part of the rubber elastic body 14, a cavity part, 15 for preventing stress concentration is formed. Furthermore, an upper surface of the rubber elastic body 14 forms a gentle pyramid shape inclined surface toward its central part so as to prevent rubber breakage even when a large load in the vertical direction is applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration rubber, and more particularly to an anti-vibration rubber suitable for anti-vibration and soundproofing of buildings such as music halls, building equipment, equipment and the like.

[0002]

2. Description of the Related Art Conventionally, in the installation of a building such as a music hall, a building structure such as building equipment, equipment, etc., as shown in FIG. An anti-vibration rubber 3 which is formed by adhering or non-adhering a rubber elastic body 2 between 1 is used.
It is being inserted between and.

[0003]

However, such a conventional vibration isolation method has the following problems. That is, since the above-mentioned vibration-proof rubber 3 has a smaller spring constant in the horizontal direction, which is the shearing direction, than the spring constant in the vertical direction, which is the compression direction, and the strength in the horizontal direction is not sufficient, as shown in FIG. Attach another anti-vibration rubber as a horizontal stopper 6 to the side of the structure 4, etc., and horizontally with respect to the horizontal load generated during an earthquake and an unexpected horizontal load generated during the installation work of the structure 4, etc. It was necessary to limit directional movement and prevent destruction.

Further, when the vertical natural frequency of the vibration-proof rubber 3 is set low by a method such as reducing the spring constant of the rubber elastic body 2, a vertical load or structure generated during an earthquake is generated. As shown in FIG. 10 (a), a vibration-proof rubber having a large spring constant is juxtaposed as a vertical stopper 7 against a vertical impact load generated during the installation work of No. 4 and the like.
As shown in 0 (b), it was necessary to support a large vertical load by the vertical stopper 7 to prevent the vibration isolating rubber 3 from being broken. In addition, the vertical stopper 7 and the horizontal stopper 6 described above are often used in combination, and there is a problem in that extra costs such as a stopper installation cost and an installation time are required.

The present invention has been made to cope with these problems, and has sufficient strength and vibration isolation performance in both horizontal and vertical directions, and the ratio of spring constants in each direction can be arbitrarily changed. An object is to provide a vibration-proof rubber that can be used.

[0006]

The vibration-proof rubber of the present invention comprises a lower mounting member in which a metal fitting having a U-shaped cross section and a metal fitting having an L-shaped cross section are combined and arranged so as to form a receiving portion, and the inside of the receiving portion. And an upper mounting member arranged with its upper surface parallel to the bottom surface of the lower mounting member, and a rubber elastic body integrally vulcanized and molded in the space between the lower mounting member and the upper mounting member. , The upper surface of the upper mounting member is disposed above the upper peripheral surface of the lower mounting member, and the upper surface of the rubber elastic body is inclined from the upper peripheral surface of the lower mounting member toward the upper surface of the upper mounting member. It is characterized by having a gentle slope.

Further, in such an anti-vibration rubber, a part of the bottom surface portion of the rubber elastic body which is in contact with the inner bottom surface of the lower mounting member is
Characterized in that a cavity is formed

[0008]

When a large vertical load is applied to the anti-vibration rubber of the present invention, the upper mounting member is pushed down, and the rubber elastic body provided between the upper mounting member and the lower mounting member is moved vertically. When the upper surface of the upper mounting bracket is at the same level as the upper peripheral surface of the lower mounting bracket, the upper mounting bracket is compressed (deforms) until the upper surface, which had a gentle slope, becomes almost flat. ,
Since a part of the large vertical load is applied to the upper peripheral surface of the lower mounting member, the upper mounting member stops falling, and the rubber elastic body is not further deformed.

As described above, the anti-vibration rubber of the present invention itself has a stopper function of restricting the movement in the vertical direction (z direction), so that the vibration in the vertical direction is large during an earthquake or a structure installation work. Even if a load is applied, the anti-vibration rubber will not be broken and the bearing capacity will not be lost. The anti-vibration rubber of the present invention,
Since the cross section in the horizontal direction (x, y direction) has a structure in which the rubber elastic layer is sandwiched between the upper and lower mounting brackets, respectively, it has an effective stopper function against the horizontal load, The rubber elastic body is not broken.

Further, in the anti-vibration rubber of the present invention,
The ratio of the spring constants in the x, y, and z directions can be set arbitrarily. That is, by changing the thickness of the rubber elastic body and the thickness of the upper and lower mounting brackets in each of the x, y, and z directions, or by making a part of the joint surface between the upper mounting bracket and the rubber elastic body non-bonded, The value of the spring constant in that direction can be increased or decreased to arbitrarily change the ratio of the spring constants. Furthermore, by adjusting the spring constant in each direction in this way, the spring constant in each horizontal direction (x direction and y direction) and the spring constant in the vertical direction (z direction) are all made the same, and the natural frequency is the same in each direction. It is possible to have the same anti-vibration characteristics.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of the anti-vibration rubber of the present invention, and FIGS. 2 and 3 are a front view and a side view of the same, respectively. 4 and 5 are a sectional view taken along the line AA and a sectional view taken along the line BB in FIG. 1, respectively.

In the anti-vibration rubber of the embodiment, as shown in the drawing, a pair of metal fittings 9 each having an L-shaped cross section such as angles are provided in the vertical portion 9 in the concave groove of the metal fitting 8 having a U-shaped cross section.
a are arranged so as to face each other at a predetermined interval, and the horizontal mounting portions 8b and 9b of these metal fittings are respectively provided with mounting holes 10 for installation in a building foundation or the like. There is. Then, the U-shaped metal fitting 8 and the L-shaped metal fitting 9 are combined to form a lower mounting metal fitting 11, and a screw hole 12 for mounting to a structure or the like is provided at the center in a concave receiving portion thereof. Top mounting metal fitting 1
3, the upper surface 13a is parallel to the horizontal mounting portion 8b of the U-shaped metal fitting 8 in cross section, and the upper peripheral surface of the lower mounting metal fitting 11, that is, the vertical portion 8a of the U-shaped metal fitting 8 in cross section and the vertical portion 9a of the L-shaped metal fitting 9 in cross section.
It is arranged to be slightly higher than the upper peripheral surface. Then, a space formed between the lower mounting member 11 and the upper mounting member 13 and having a substantially U-shaped cross section is filled with a rubber material except for a part of the lower peripheral edge portion and integrally vulcanized and molded. A rubber elastic body 14 is provided. That is, the rubber elastic body 14 includes a flat rubber portion 14 a provided between the lower portion of the lower mounting member 11 and the bottom surface 13 b of the upper mounting member 13,
It is composed of an annular rubber portion 14b provided between the upper portion of the lower mounting member 11 and the side surface 13c of the upper mounting member 13, and in the flat rubber portion 14a, at both ends of the bottom portion in contact with the U-shaped metal fitting 8 in cross section, respectively. The cavity 15 is formed along the x direction. Further, the annular rubber portion 14b of the rubber elastic body 14
In the above, the peripheral portion is formed so as to cover the upper peripheral surface of the lower mounting member 11, and the upper surface is the upper surface 13 of the upper mounting member 13.
It is formed so as to gently incline toward a central portion having substantially the same height as a.

In the anti-vibration rubber of the embodiment having such a structure, the upper surface 13a of the upper mounting member 13 is slightly higher than the upper peripheral edge surface of the lower mounting member 11 and the rubber provided around the upper surface 13a. Since the upper surface of the elastic body 14 forms a gentle pyramid-shaped inclined surface inclined toward the central portion,
This itself has a stopper function that limits movement in the vertical direction (z direction). That is, when a large vertical load is applied to the anti-vibration rubber of the embodiment, the upper mounting bracket 13
Is pressed down by the load, the rubber elastic body 14 is compressed in the vertical direction, and is deformed until the upper surface inclined in a pyramidal shape toward the center becomes substantially flat. When the height becomes the same as that of the upper peripheral edge surface of the metal fitting 11, part of the large vertical load is applied to the upper peripheral edge surface of the lower mounting metal fitting 11, so that the lowering of the upper mounting metal fitting 13 stops and the rubber elastic body is stopped. 14 also maintains a compressed state without further deformation. As described above, in the anti-vibration rubber of the embodiment, even if an unexpected vertical load is applied at the time of an earthquake or a work for installing a structure, the rubber elastic body 14 is not broken and a sufficient bearing ability is exerted.

The antivibration rubber of the embodiment has the x direction and the y direction.
Since the cross section in the direction has a structure in which the layer of the rubber elastic body 14 is sandwiched between the upper and lower mounting brackets 11 and 13,
Such a structure itself effectively functions as a stopper against loads in the x and y directions, and prevents the rubber elastic body 14 from being broken.

Further, when the rubber elastic body 14 is deformed (flexed) in the vertical direction (z direction) and the horizontal direction (x, y directions), a cavity 15 is formed along the x direction at the bottom of the flat rubber part 14a. Since it is provided and serves as an escape area for the deformed rubber elastic body 14, it is possible to avoid stress concentration, so that it has sufficient strength in the vertical and horizontal directions. In addition,
The cavity 15 in the rubber elastic body 14 can be provided along the y direction instead of the x direction.
y Alternatively, they may be provided along both directions. Furthermore, in the vibration-proof rubber having a structure in which gaps are provided between the four corners of the receiving portion of the lower mounting member 11, that is, between the vertical portion 9a of the L-shaped metal fitting 9 in cross section and the vertical portion 8a of the U-shaped metal fitting 8 in cross section, Since the rubber elastic body 14 expands from these gaps and stress concentration is avoided, it is not always necessary to provide the hollow portion 15.

In the anti-vibration rubber of the embodiment, x,
The ratio of the spring constants in the y and z directions can be set arbitrarily. For example, when the spring constant in the z direction is 1, x,
The spring constant in each y direction can be arbitrarily changed within the range of 0.1 to 2.0, and at this time, the spring constants in the x and y directions can be set to different values.

That is, the upper and lower mounting brackets 13, 1 in each of the directions P (z direction), Q (x direction), and R (y direction) as viewed from the arrow.
The projected area of 1 (the area of the overlapping portion) is A _P , A
_Q, and A _R, x, and y, z each direction of the spring constants respectively K _x, K _y, and K _z, the thickness of each t _x in each direction of the rubber elastic body layer, t _y, and t _z Then, it has been confirmed that the following relationship holds.

K _z : K _x : K _y = (A _P + t _z ) :( 2
_{A Q + t x) :( 2A} R + t y) t z: t x: t y = 0.7~ 1.0: 1: 1 to when _{K z: K x: K y} = 1: 0.8~ 1.2: 0.8~ 1.2 = about
1: 1: 1 At this time, the rubber elastic body 14 (flat rubber portion 14a)
By providing the cavity 15 along the x direction at the bottom of the z,
The spring constant K _z in each direction can be suppressed low, and the ratio of the spring constants in each direction can be adjusted by adjusting the disposing direction and size of the cavity 15.

As described above, in the anti-vibration rubber of the embodiment, the projected areas of the upper and lower mounting brackets 13 and 11 in the x, y and z directions and the thickness of the rubber elastic layer in each direction can be easily adjusted. The ratio of the spring constants in the x, y, and z directions can be arbitrarily set.

Further, in the embodiment, the upper mounting member 13
Are non-bonded to the pair of side surfaces 13c arranged in the x-direction or the y-direction in contact with the rubber elastic body 14 to reduce the spring constant in that direction, thereby reducing the spring constant in each direction. It is possible to adjust the ratio. For example,
The spring constants of the anti-vibration rubber in the horizontal direction (x, y directions) are the horizontal directions (x, y directions) of the upper mounting member 13 and the lower mounting member 11.
The compression spring constant of the projected area portion + the tension spring constant, and the shear spring constant of the projected area portion of the upper mounting member 13 and the lower mounting member 11 in the vertical direction (z direction) are added. Then, if a part of the side surface 13c of the upper mounting member 13 is made non-adhesive, the spring action in the x-direction or the y-direction is not exerted, so that the spring constant in this direction becomes small.

Furthermore, in the anti-vibration rubber of the present invention, the ratio of the spring constants in the x, y and z directions can be changed by changing the shape of the upper mounting member.

A vibration-proof rubber having such a structure is shown in FIG.
And (b). That is, in this embodiment, a metal member having a U-shaped cross section is used as the upper mounting member 13, and the upper mounting member 13 is the lower mounting member 11.
A rubber elastic body 14 is disposed in the receiving portion of the container along the x direction with the horizontal portion facing upward, and the space between these fittings is filled with a rubber material and integrally vulcanized and molded. Has been. In FIG. 6, the screw holes and the mounting holes are omitted, and the upper and lower mounting brackets 13 and 11 are shown.

In this embodiment, as in the previous embodiment, the projected areas of the upper and lower mounting brackets 13 and 11 in the directions P (z direction), Q (x direction) and R (y direction) as viewed from the arrow. Respectively A
_{Let P} , A _Q and A _R be spring constants in the x, y and z directions and the thickness of the rubber elastic layer be K _x , K _y and K _z and t _x , t _y and t _z , respectively. K _z : K _x : K _y = (A _P + t _z ) :( 2A _Q +
_{t x) :( 2A R + t} y) = 1: 1: 0.2~ 0.4
_{(T z: t x: t} y = 0.7~ 1.0: 1: 1) , and the in comparison to the embodiment, x, y, the ratio of z-direction of the spring constant largely changes. Also in this embodiment, similarly to the previous embodiment, the upper surface of the upper mounting member 13 is slightly higher than the upper peripheral edge surface of the lower mounting member 11, and the rubber elastic body 14 provided around the upper mounting member 13 is slightly higher. Since the upper surface is an inclined surface inclined toward the central portion, it has a stopper function in the vertical direction (z direction), and the rubber elastic body 14 does not break even when a large vertical load is applied. , Sufficient bearing capacity is maintained.

Further, in the anti-vibration rubber of the present invention, as shown in the following embodiments, by removing the L-shaped cross-section metal fitting 9 on one side constituting the lower mounting metal fitting 11 from only one side, x, y, It is possible to change the ratio of the spring constants in the z direction. That is, the embodiment shown in FIG. 7 has a structure in which one of the L-shaped metal fittings 9 arranged in parallel to the y direction is removed, and the spring constant in the x direction is greatly reduced.
The anti-vibration rubber having such a structure is effectively used, for example, when a load is constantly applied in the x and z directions indicated by the arrows.

[0026]

As described above, in the anti-vibration rubber of the present invention, the upper mounting member is arranged in the receiving portion of the lower mounting member such that the upper surface thereof is slightly higher than the upper peripheral surface of the lower mounting member. In addition, since the upper surface of the rubber elastic body that is vulcanized and adhered around it forms a mountain-shaped inclined surface that is inclined toward the center, it has a stopper function that limits the movement in the vertical direction (z direction), It also has a stopper function against horizontal (x, y) loads. Therefore, even if an unexpected vertical or horizontal load is applied during an earthquake or installation work of a structure, the rubber elastic body is not broken and a sufficient bearing capacity is maintained. Further, in the anti-vibration rubber of the present invention, the anti-vibration rubber has sufficiently large anti-vibration performance both in the horizontal direction and in the vertical direction, and the ratio of the spring constants in each of the x, y and z directions can be set arbitrarily.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a vibration-proof rubber of the present invention.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a side view of the embodiment.

4 is a cross-sectional view taken along the line AA in FIG.

5 is a sectional view taken along line BB in FIG.

FIG. 6 shows another embodiment of the anti-vibration rubber of the present invention, (a)
Is a vertical sectional view along the x direction, and (b) is a vertical sectional view along the y direction.

FIG. 7 shows another embodiment of the anti-vibration rubber of the present invention x
The longitudinal cross-sectional view along the direction.

FIG. 8 is a vertical cross-sectional view showing a conventional vibration-proof structure such as a building structure.

FIG. 9 is a vertical cross-sectional view showing a state in which a horizontal stopper is attached in the conventional vibration damping structure.

FIG. 10 is a vertical cross-sectional view showing a state in which a vertical stopper is attached in the conventional vibration-proof structure.

[Explanation of symbols]

 8 ………… Sectional U-shaped bracket 9 ……… Sectional L-shaped bracket 11 ……… Lower mounting bracket 13 ……… Upper mounting bracket 14 ……… Rubber elastic body 15 ……… Cavity

Claims (2)

[Claims] 1. A lower mounting member in which a metal fitting having a U-shaped cross section and a metal fitting having an L-shaped cross section are arranged in combination so as to form a receiving portion, and an upper surface in the receiving portion is parallel to a bottom surface of the lower mounting metal fitting. And a rubber elastic body integrally vulcanized and molded in a space between the lower mounting bracket and the upper mounting bracket, and an upper surface of the upper mounting bracket is the lower mounting bracket. Is disposed above the upper peripheral edge surface of the rubber elastic body, and the upper surface of the rubber elastic body forms a gentle inclined surface inclined from the upper peripheral edge surface of the lower mounting member toward the upper surface of the upper mounting member. Anti-vibration rubber. 2. The anti-vibration rubber according to claim 1, wherein a cavity is formed in a part of a bottom surface portion of the rubber elastic body which is in contact with the inner bottom surface of the lower mounting member.