JP2915210B2 - Vibration isolation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator applied to a room for installing precision equipment such as a computer or a table for installing a heavy object having a high center of gravity. The present invention relates to a vibration isolator for interposing a plurality of vibration isolating mechanisms between a floor and an upper floor to protect the equipment installed on the upper floor from vibrations such as an earthquake.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 1, a so-called computer room for installing equipment such as a computer has a double floor structure in which an upper floor 2 is constructed above a floor 1 of a building itself. A plurality of vibration isolators 10 are arranged on the floor surface 1 to support the upper floor 2, and the vibration isolators 10
, The upper floor 2 can be isolated from vibrations such as earthquakes.

For example, a vibration isolator 10 shown in FIG. 2 is similar to that disclosed in Japanese Utility Model Publication No. 57-25942. As for the vertical vibration, the vertical vibration 11 is provided in the vibration isolator 10 to form a long-period vibration system, and the vibration is greatly removed from the natural period of the building to produce a vibration isolation effect. A hydraulic damper 12 is provided vertically to form a damping system for damping vertical vibration.

On the other hand, regarding horizontal vibration, a horizontal spring 16
And a base 13 constituting a base of a damping vibration system for vertical vibration, and a sliding plate 14 fixed to the floor 1.
The horizontal vibration is attenuated by the plate member 15 made of a low-friction material and arranged on the plate surface of the slide plate 14 at a distance from each other to achieve vibration isolation.

In the vibration isolator 10, the load imposed on the upper floor 2 is received by the main body cover 17, and 90% of the load supported by the main body cover 17 is transferred to the vertical spring 11 and the remaining 10% is transferred to the inner center of the main body cover 17. Are shared via a stopper 19 at this time.
Is interposed in a state where it is pulled by the tension spring 20.
When the stopper 19 comes off due to the tensile force of the tension spring 20 due to the vertical vibration caused by an earthquake or the like, the support of the main body cover 17 is shifted to the elastic suspension by the vertical spring 11, and the vibration isolation effect is exhibited.

[0006]

However, in the vibration isolator 10 described above, the vibration isolating effect is not exhibited unless the vibration energy is greater than a certain level so that the tension spring 20 can be operated. There has been a demand to make this function even when the vibration energy is small, that is, even for a small earthquake or the like. Here, the damping vibration system of the vertical vibration can cope with low energy vibration by appropriately setting the vertical spring 11 and the hydraulic damper 12.
Since the damping vibration system of horizontal vibration is a system based on sliding friction, it is not easy to set the vibration vibration system, and some contrivance is required.

Therefore, a vibration isolator capable of exhibiting a vibration isolating effect even with a smaller vibration energy has been developed (for example, see Japanese Patent Application Laid-Open No. 3-183864). In this vibration isolator, a supporting member provided on the lower floor supports the upper floor at a distance in a height direction to form a double floor structure, and a sliding type vibration isolating mechanism is provided between the lower floor and the supporting member. Is provided. That is, this sliding type vibration isolating mechanism is provided with a sliding plate on a lower floor for slidingly supporting a supporting member so as to be movable in a horizontal direction, and a coat layer made of a low-friction polymer material between the sliding plate and the supporting member. Is interposed. As a result, the dynamic friction coefficient μD can be reduced to about 0.06.

The vibration-absorbing performance of the low-friction type vibration-absorbing floor constructed as described above has a starting acceleration of 70 to 80 gal and a maximum response acceleration of about 100 gal, which is no problem as a vibration-isolating floor for protecting a computer. It has vibration characteristics.
The advantage of this pure sliding-type vibration-isolating floor is that there is no need to install a damper by utilizing frictional attenuation due to sliding, the vibration-isolating mechanism is simple, and construction costs can be reduced in this regard.

However, even in such a vibration isolating floor structure, conventionally, the vibration isolating mechanisms used for the floor isolating structure are all of a sliding type. In this case, there is no problem as to the computer, but in the case of using only the slip-type vibration isolating mechanism, the acceleration to start slipping is at a relatively large acceleration level, and the movement at the low acceleration level is particularly low compared to the rolling type. Had the disadvantage that it was not smooth.

Further, when starting at a lower acceleration level is required, a vibration isolating floor using only a pure sliding type vibration isolating mechanism has a limit that the dynamic friction coefficient μD can be reduced. May not always be able to answer certain requests. In particular, when the present invention is applied to a floor or the like for installing a heavy object having a high center of gravity, it is desired that the engine can be sufficiently started at a low acceleration level.

The present invention has been made in view of such a background, and a vibration damping system for horizontal vibration can exhibit a vibration isolation effect even with a small vibration energy.
In particular, an object of the present invention is to provide a vibration isolator that can be sufficiently started at a low acceleration level.

[0012]

In order to achieve the above object, a vibration isolator according to the present invention comprises a double-floor structure in which a supporting member provided on a lower floor supports the upper floor at a distance in a height direction. Forming a plurality of vibration isolation mechanisms for isolating horizontal vibration of the upper floor between the lower floor and the support member, and moving the support member horizontally on the lower floor as the vibration isolation mechanism. A sliding-type vibration-isolating mechanism having a sliding plate for slidably supporting the support member and a resilient member for resiliently repelling the support member to the lower floor, and the support member to be horizontally movable on the lower floor. And a resilient member having a resilient member for repelling the support member horizontally with respect to the lower floor.

[0013]

According to the present invention, by using both the sliding type vibration isolating mechanism and the rolling type vibration isolating mechanism, the advantages of each mechanism can be used synergistically to solve the above-mentioned problems.

That is, by using the sliding bearing by the sliding type vibration isolating mechanism, the damping is ensured, and by using the rolling bearing by the rolling type vibration isolating mechanism, the dynamic friction coefficient μD is further reduced. The motion of the vibration-isolated floor at the acceleration level can be made smooth.

In the sliding type vibration isolating mechanism, the limit of the dynamic friction coefficient μD is about 0.06, whereas in the rolling type vibration isolating mechanism, the dynamic friction coefficient μD is considerably smaller than 0.06. Can be set to a value. For example, when the same number of sliding type vibration isolating mechanisms and rolling type vibration isolating mechanisms are arranged, the total dynamic friction coefficient μD between the upper floor and the lower floor is
Can be reduced to about 0.03, and the need for a damper can be eliminated.

As a result, according to the present invention, it is possible to smoothly respond to movement at a low acceleration level, for example, low-energy horizontal vibration, and it is possible to reliably remove a movement of a supported body having a high center of gravity with respect to a bottom area. You can shake.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows the entire configuration of the vibration isolator according to the present embodiment, and FIGS. 2 to 5 show a sliding type vibration isolator among the vibration isolating mechanisms constituting the vibration isolator. FIG. 7 shows a rolling type vibration isolating mechanism.

Basically, the present invention forms a double floor structure by supporting the upper floor 2 with a support member 10 provided on the lower floor 1 at an interval in the height direction. A plurality of vibration isolating mechanisms for isolating horizontal vibrations of the upper floor 2 are provided between the sliding plate 14 and the sliding plate 14 for slidingly supporting the support member 10 on the lower floor 1 so as to be movable in the horizontal direction. A sliding-type vibration isolation mechanism A having a resilient member 16 for resiliently supporting the support member 10 with respect to the floor 1 and a rolling member for supporting the support member 10 on the lower floor 1 so as to be movable in the horizontal direction. And a resilient member 16 for resiliently supporting the support member 10 with respect to the lower floor 1 and the lower floor 1.

A floor 1 as a lower floor shown in FIG. 1 forms a part of a building structure not shown. On this floor 1, a plurality of vibration isolation mechanisms A and B supporting an upper floor 2 are provided. They are arranged at appropriate intervals. In the vibration isolator according to this embodiment, the same number of sliding type vibration isolating mechanisms A and rolling type vibration isolating mechanisms B are arranged on the floor 1 within a certain range. That is, in this embodiment, the total number of the vibration-isolating mechanisms is four, and the sliding-type seismic-isolating mechanism A and the rolling-type seismic-isolating mechanism B each include:
Two units of the same type are arranged to face each other diagonally.

As shown in FIGS. 2 to 5, the sliding type vibration isolating mechanism A has a stainless steel sliding plate 14 fixed on the floor 1, and a frictional resistance is placed on the sliding plate 14. The base 13 is slidably mounted via a plate 15 (shown in FIG. 4) made of a material having a small size.

As shown in FIGS. 2 to 4, the vertical spring 1 having a longer period than the natural period of the building is provided on the upper surface of the base 13.
The upper end of the vertical spring 11 is pressed against a holding plate 21 disposed inside a main body cover 17 on a cylinder surrounding the vertical spring 11. The distance from the plate 22 is kept constant by a spring force adjusting screw 23 screwed through the top plate 22.
That is, the main body cover 17 is elastically suspended by the vertical spring 11, and can move up and down relatively with respect to the base 13 on the floor surface 1 side in accordance with expansion and contraction of the vertical spring 11. The pressing force is adjusted by the adjusting screw 23.

The hydraulic dampers 12 are disposed outside the main body cover 17. The hydraulic dampers 12 are mounted on the outer peripheral surface of the main body cover 17 at the upper end and on the base 13 at the lower end, respectively. The vertical movement of the cover 17 is attenuated.

Further, one end of a horizontal spring 16 provided in the horizontal direction is fixed to the base 13, and the other end of the horizontal spring 16 is fixed to the floor surface 1. A plurality of the horizontal springs 16 (four at 90 ° intervals in the illustrated example) are provided at equal intervals.

The lower end of a shaft 18 is fixed substantially at the center of the base 13, and the shaft 18 is fixed to the holding plate 21 and the top plate 2.
2 and extends upward, and at its upper end, a regulating means 2
5 are provided.

The restricting means 25 includes a disk-shaped stopper 19 mounted on the upper end surface of the shaft 18. The stopper 19 is a tension spring having one end attached to a locking bar 26 fixed to the top plate 22. It is pulled by 20. Regulatory means 2
5 further has a side plate 27 for fixing it to the top plate 22, and a pressing member 28 for holding the stopper 19 between the end face of the shaft 18 by frictional force, which is shown most clearly in FIG. As described above, a flat U-shaped notch 29 is formed on the front surface of the holding member 28. When the stopper 19 is in the illustrated sandwiching state, the main body cover 17 is integrally connected to the base 13 via the pressing member 28, the stopper 17, and the shaft 18.

On the other hand, as the shaft 18 moves up and down together with the base 13 during an earthquake, the pressing member 28 and the shaft 1
8 When the distance from the upper end surface is widened, the stopper 19 overcomes the friction and separates from the pressing member 28 by the tension spring 20.
Since the rigid connection between the main body cover 17 and the shaft 18 is released, the main body cover 17 shifts to the elastic suspension by the vertical spring 11 described above.

Further, in the above-described vibration isolation mechanism A,
On the upper surface of the sliding plate 14, a low friction polymer layer 3
0 is provided. In addition, the sliding plate 1 provided with the coat layer 30
A low-friction lubricating film material 31 may be interposed between the plate 4 and the plate 15 so as to overlap the upper surface of the coat layer 30. As the coat layer 30, for example, a fluororesin or polyethylene is used.

With such a configuration, since the upper surface of the sliding plate 14 is the low-friction coating layer 30, sliding friction is reduced. In addition, the interposition of the lubricating film material 31 with low friction further reduces the sliding friction, and can cope with low-energy vibration. Further, the sliding plate 14 itself may be formed by forming an ultrahigh molecular weight material.

On the other hand, the rolling type vibration isolating mechanism B has a structure in which a rolling member for rollingly supporting the support member 10 on the floor surface 1 so as to be movable in the horizontal direction is provided. That is,
As shown in FIGS. 6 and 7, a plurality of universal bearings 42 are provided on the lower surface of a horizontal disk-shaped support plate 41 provided at the lower end of the base 13 at circumferential intervals. The rolling support is performed on a stainless sliding plate 14 fixed to the floor surface 1.

In the rolling type anti-vibration mechanism B, other than the rolling bearing structure, the sliding type anti-vibration mechanism A has a resilient member for resiliently supporting the support member with respect to the floor 1 in a horizontal direction. Since the configuration is substantially the same as that described above, the description thereof is omitted.

According to the vibration isolator of the present embodiment having the above-described configuration, by having the sliding type vibration isolating mechanism A for performing the sliding bearing and the rolling type vibration isolating mechanism B for performing the rolling bearing, the horizontal vibration isolator is provided. With respect to the vibration damping vibration system, the vibration energy for exhibiting the vibration isolation effect can be reduced.

That is, according to this embodiment, the advantages of each of the vibration isolation mechanisms A and B can be used synergistically. As a result of the experiment, the dynamic friction coefficient as a whole is about 0.04,
It was recognized that the starting acceleration of the vibration-isolated floor could be reduced (5
(Starting at 0 to 60 gal, vibration isolating effect at 60 gal). In particular, the motion of the vibration-isolated floor at low acceleration levels became smooth.

[0033]

As described in detail in the above embodiments, according to the vibration isolator according to the present invention, since both the sliding bearing and the rolling bearing are provided, the horizontal vibration damping vibration system is The vibration isolation effect can be exhibited even with a small vibration energy, and it is possible to start sufficiently at a low acceleration level, and to smoothly move the vibration isolation floor in all response amplitude ranges from low acceleration to large acceleration. An excellent effect is achieved.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a first embodiment of the present invention, partially cut away.

FIG. 2 is a perspective view showing a sliding type vibration isolation mechanism in the vibration isolation device shown in FIG.

FIG. 3 is a plan view of the vibration isolation mechanism shown in FIG.

FIG. 4 is a cross-sectional view of FIG. 3 taken along the line IV-IV.

5 is an enlarged plan view showing a portion indicated by an arrow V in FIG. 3;

FIG. 6 is a partial side view showing a rolling type vibration isolating mechanism in the vibration isolating device shown in FIG. 1;

FIG. 7 is a bottom view of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower floor (floor surface) 2 Upper floor 10 Support member 14 Sliding plate 16 Resilient member 42 Swivel bearing (rolling member) A Sliding type vibration isolating mechanism B Rolling type vibration isolating mechanism

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukio Okuda 2-3-3 Kandajicho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Kazuhisa Kanada 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Stock (72) Inventor Takeshi Nakamura 1-3-6 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Tokiko Corporation (56) References JP-A-61-106864 (JP, A) (58) Investigated Field (Int.Cl. ⁶ , DB name) E04F 15/18 601 E04H 9/02 331 F16F 15/04

Claims (1)

(57) [Claims] An upper floor is supported at intervals in a height direction by a support member provided on the lower floor to form a double floor structure, and a horizontal vibration of the upper floor is provided between the lower floor and the support member. A plurality of vibration-isolation mechanisms for isolating vibration, the vibration-isolation mechanism includes a sliding plate that slidably supports the support member on the lower floor so as to be movable in a horizontal direction, and a horizontal direction of the support member with respect to the lower floor. A sliding-type vibration-isolating mechanism having a resilient member that resiliently and a rolling member that horizontally supports the support member on the lower floor so as to roll and support the support member horizontally with respect to the lower floor. A vibration isolating device comprising: a rolling type vibration isolating mechanism having a resilient member that repels.