JPH0633582A - Base isolation device - Google Patents

Abstract

PURPOSE:To sufficiently exhibit vibration isolation effect by providing sliding type vibration isolation mechanisms and rolling type base isolation mechanisms to isolate horizontal vibration of an upper floor between the lower floor and the supporting members of a double flooring construction. CONSTITUTION:A double flooring construction in which the upper floor 2 is supported spacedly in the vertical direction with supporting members 10 provided on the lower floor 1 is formed. Sliding type base isolation mechanisms A and rolling type isolation mechanisms B to isolate horizontal vibration of the upper floor 2 are provided between the lower floor 1 and the supporting members 10. The mechanism A is provided with a sliding plate 14 slidingly supporting the supporting member 10 so as to be movable on the lower floor 1 in the horizontal direction and an elastically drive member 16 to elastically drive the supporting member 10 in the horizontal direction. The mechanism B is provided with a rolling member rollingly supporting the member 10 on the lower floor 1 in the horizontal direction and the elastically drive member 16. Consequently, even in small vibration energy, the vibration isolation effect can be exhibited.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolation device applied to a room in which precision equipment such as a computer is installed or a table in which a heavy object having a high center of gravity is installed, and more particularly, to an upper floor and a lower floor of a double floor structure. The present invention relates to a vibration isolation device for interposing a plurality of vibration isolation mechanisms between a floor and a floor to isolate the upper floor from vibration such as an earthquake and protect equipment installed on the upper floor from vibration.

[0002]

2. Description of the Related Art Generally, 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 surface 1 of the building itself as shown in FIG. A plurality of vibration isolation devices 10 are arranged on the floor surface 1 to support the upper floor 2, and the vibration isolation devices 10
Has constructed a vibration-isolated floor that can isolate the upper floor 2 from vibrations such as an earthquake.

For example, the vibration isolation device 10 shown in FIG. 2 is similar to that disclosed in Japanese Utility Model Publication No. 57-25942. With respect to vertical vibration, the vibration isolation device 10 has a vertical spring 11 to form a long-period vibration system, and produces a vibration isolation effect by largely deviating from the natural period of the building. A vertical hydraulic damper 12 is provided to form a damping system for damping vertical vibration.

On the other hand, regarding horizontal vibration, the horizontal spring 16
And a slide plate 14 fixed to the floor surface 1 and a base 13 that constitutes a base of a damping vibration system for vertical vibration.
And 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 attenuate the horizontal vibration to achieve the vibration isolation.

Further, in the vibration isolator 10, the load of the upper floor 2 is received by the main body cover 17, 90% of the load supported by the main body cover 17 is in the vertical spring 11, and the remaining 10% is in the center of the inside of the main body cover 17. The shafts 18 arranged in the above are shared by the stoppers 19 at this time.
Is interposed in a tensioned state by the tension spring 20.
Then, when the stopper 19 is disengaged by the pulling force of the tension spring 20 due to the vertical vibration due to 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 isolation device 10 described above, the vibration isolation effect cannot be exhibited unless the vibration energy is large enough to operate the tension spring 20. There has been a demand for this to function even when the vibration energy is small, that is, for a small earthquake or the like. Regarding the damping vibration system of the vertical vibration, it is possible to 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 it, and some ingenuity has been required.

Therefore, a vibration isolation device has been developed which is capable of exhibiting a vibration isolation effect even with a smaller vibration energy (see, for example, Japanese Unexamined Patent Publication No. 3-183864). This vibration isolation device forms a double floor structure by supporting the upper floor at intervals in the height direction with a support member provided on the lower floor, and a sliding type vibration isolation mechanism between the lower floor and the support member. Is provided. That is, this slip-type vibration-isolating mechanism is provided with a sliding plate for slidingly supporting a supporting member on the lower floor so that the supporting member can move horizontally, and a coating layer made of a low-friction polymer material between the sliding plate and the supporting member. Is installed. As a result, the dynamic friction coefficient μD can be reduced to about 0.06.

The vibration-isolating performance of the low-friction type vibration-isolated floor constructed as described above has a starting acceleration of 70 to 80 gal and a maximum response acceleration of approximately 100 gal, and is a problem-free vibration-isolated floor for protecting a computer. It has vibration characteristics.
The advantage of this purely sliding type vibration-isolated floor is that it is not necessary to install a damper by utilizing the friction damping due to slippage, the vibration-isolation mechanism is simple, and the construction cost can be reduced from this point.

However, even in such a vibration-isolated floor structure, conventionally, all the vibration-isolation mechanisms used for the vibration-isolated floor structure are of the sliding type. In this case, there is no problem for computers, but with a slip-type vibration-isolation mechanism only, the acceleration at which slippage begins is at a relatively high acceleration level. Has the drawback that it is not smooth.

Further, when starting at a lower acceleration level is required, the dynamic friction coefficient μD is limited in the vibration-isolated floor using only this purely slip-type vibration-isolation mechanism, which is a technical problem. It may not always be possible to meet such demands. Particularly when 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 damping system for horizontal vibration can exhibit a vibration isolation effect even with a small vibration energy.
In particular, it is an object of the present invention to provide a vibration isolation device that can be sufficiently started at a low acceleration level.

[0012]

In order to achieve the above object, the vibration isolator of the present invention has a double floor structure in which a support member provided on the lower floor supports the upper floor at intervals in the height direction. And a plurality of vibration isolation mechanisms for isolating horizontal vibration of the upper floor are provided between the lower floor and the support member. As the vibration isolation mechanism, the support member is horizontally moved on the lower floor. A sliding type vibration-isolating mechanism having a sliding plate for slidingly supporting and a resilient member that resiliently resiliently supports the supporting member in the horizontal direction with respect to the lower floor, and the supporting member can be moved in the horizontal direction on the lower floor. And a rolling type vibration isolation mechanism having a rolling member for rollingly supporting the elastic member and an elastic member for elastically elastically supporting the supporting member in the horizontal direction 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 synergistically utilized to solve the above problems.

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

In the sliding type vibration isolation mechanism, the limit of the dynamic friction coefficient μD is about 0.06, whereas in the rolling type vibration isolation 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 slide type vibration isolation mechanisms and rolling type vibration isolation mechanisms are arranged, the dynamic friction coefficient μD as a whole between the upper floor and the lower floor is μD.
Can be set to about 0.03, and the damper can be eliminated.

As a result, according to the present invention, movement at a low acceleration level, for example, low-energy horizontal vibration can be smoothly dealt with, and even a supported object having a high center of gravity with respect to the bottom area can be surely isolated. You will be able to shake.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows the whole structure of the vibration isolator according to the present embodiment, and FIGS. 2 to 5 show a slip-type vibration isolator among the vibration isolator constituting the vibration isolator. FIG. 7 also shows a rolling type vibration isolation mechanism.

In the present invention, basically, a supporting member 10 provided on the lower floor 1 supports the upper floor 2 at intervals in the height direction to form a double floor structure. A plurality of vibration isolation mechanisms for isolating the horizontal vibration of the upper floor 2 are provided between the lower floor 1 and the sliding plate 14 for slidingly supporting the support member 10 on the lower floor 1 in the horizontal direction and the lower plate. A sliding type vibration isolation mechanism A having an elastic member 16 elastically elastically 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 horizontally movable. 42 and a resilient member 16 that resiliently resiliently supports the support member 10 with respect to the lower floor 1, and a rolling type vibration isolation mechanism B.

A floor surface 1 as a lower floor shown in FIG. 1 forms a part of a building structure (not shown), and a plurality of vibration isolation mechanisms A and B for supporting an upper floor 2 are provided on the floor surface 1. It is arranged at an appropriate interval. In the vibration isolator of this embodiment, the same number of sliding type vibration isolation mechanisms A and rolling type vibration isolation mechanisms B are arranged on the floor surface 1 within a certain range. That is, in this embodiment, the total number of the vibration isolation mechanisms is four, and each of the slip type seismic isolation mechanism A and the rolling type seismic isolation mechanism B is
Two units of the same type are arranged so as to face each other on a diagonal line.

As shown in FIGS. 2 to 5, the sliding type vibration isolation mechanism A has a stainless steel sliding plate 14 fixed on the floor surface 1, and friction resistance is provided on the sliding plate 14. The base 13 is slidably mounted via a plate 15 (shown in FIG. 4) formed of a small material.

On the upper surface of the base 13, as shown in FIGS. 2 to 4, the vertical spring 1 having a period longer than the natural period of the building.
1 is arranged, and the upper end of the vertical spring 11 is pressed against a pressing plate 21 arranged inside the cylindrical main body cover 17 surrounding the vertical spring 11, and the top plate of the pressing plate 21 and the main body cover 17 is pressed. The distance from the plate 22 is kept constant by a spring force adjusting screw 23 that is 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 the expansion and contraction of the vertical spring 11. The pressing force is adjusted by the adjusting screw 23.

Further, hydraulic dampers 12 are arranged outside the main body cover 17, and these hydraulic dampers 12 are attached to the outer peripheral surface of the main body cover 17 at the upper end and to 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 horizontal springs 16 are provided at equal intervals (four in the illustrated example at 90 ° intervals).

The lower end of a shaft 18 is fixed to the center of the base 13, and the shaft 18 includes a holding plate 21 and a top plate 2.
2 is extended upwards, and the regulating means 2 is provided at the upper end thereof.
5 are provided.

The regulating means 25 includes a disk-shaped stopper 19 placed on the upper end surface of the shaft 18, and the stopper 19 is a tension spring having one end attached to a locking rod 26 fixed to a top plate 22. Tensioned by 20. Regulation means 2
5 further has a side plate 27 for fixing it to the top plate 22 and a holding member 28 for holding the stopper 19 between the end surface of the shaft 18 and the end surface of the shaft 18 by frictional force, which is shown most clearly in FIG. As described above, the U-shaped flat cutout 29 is formed on the front surface of the pressing member 28. When the stopper 19 is in the sandwiched state shown in the figure, 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 increases, the stopper 19 overcomes friction and is separated from the pressing member 28 by the tension spring 20,
Since the rigid connection between the body cover 17 and the shaft 18 is released, the body cover 17 shifts to the elastic suspension by the vertical spring 11 described above.

Further, in the above-mentioned vibration isolation mechanism A,
On the upper surface of the sliding plate 14, a coating layer 3 of a low friction polymer material
0 is provided. Further, 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, fluororesin or polyethylene is used.

With this structure, the sliding friction is reduced because the upper surface of the sliding plate 14 is the coating layer 30 having a low friction. Further, by interposing the low-friction lubricating film material 31, the sliding friction is further reduced, and it is possible to cope with low-energy vibration. Further, the sliding plate 14 itself may be formed of an ultra high molecular weight material.

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

In the rolling type vibration isolating mechanism B, except for the rolling bearing structure, the sliding type vibration isolating mechanism A has an elastic member that elastically oscillates the supporting member horizontally with respect to the floor surface 1. Since the configuration is substantially the same as that of, the description thereof will be omitted.

According to the vibration isolator of the present embodiment having the above-mentioned structure, by having the sliding type vibration isolation mechanism A for performing sliding support and the rolling type vibration isolation mechanism B for performing rolling support, Vibration damping With respect to the vibration system, it is possible to reduce the vibration energy for exhibiting the vibration isolation effect.

That is, according to this embodiment, the advantages of the vibration isolation mechanisms A and B can be synergistically utilized, and as a result of the experiment, the dynamic coefficient of friction as a whole is about 0.04,
It was confirmed that the starting acceleration of the vibration-isolated floor can be reduced (5
Starts at 0 to 60 gal, vibration isolation effect occurs at 60 gal). Especially, the movement of the base isolation floor at low acceleration level 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 damping vibration system for horizontal vibration can be obtained. Even with a small amount of vibration energy, the vibration isolation effect can be exerted, especially at low acceleration level it can be started sufficiently, and the movement of the vibration isolation floor in all response amplitude areas from low acceleration to large acceleration can be performed smoothly. The excellent effect of being able to do is exhibited.

[Brief description of drawings]

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

FIG. 2 is a partially cutaway 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.

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 isolation mechanism in the vibration isolation device shown in FIG.

FIG. 7 is a bottom view of FIG.

[Explanation of symbols]

 1 Lower floor (floor surface) 2 Upper floor 10 Support member 14 Sliding plate 16 Elastic member 42 Flexible bearing (rolling member) A Sliding type vibration isolation mechanism B Rolling type vibration isolation mechanism

Front page continuation (72) Inventor Yu Yasui 4-640 Shimoseido, Kiyose-shi, Tokyo Inside Obayashi Technical Research Institute Co., Ltd. (72) Inventor Yukio Okuda 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Tokyo Inc In-house (72) Inventor Kazuhisa Kaneda 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo head office (72) Inventor Ken Nakamura 1-6-3 Fujimi, Kawasaki-ku, Kanagawa Prefecture Tokiko Corporation

Claims (1)

[Claims] 1. A horizontal vibration of the upper floor is provided between the lower floor and the support member by supporting the upper floor with a support member provided on the lower floor at intervals in the height direction to form a double floor structure. A plurality of vibration isolation mechanisms for vibration isolation are provided, and the vibration isolation mechanism includes a slide plate for slidingly supporting the support member on the lower floor so as to be horizontally movable, and a horizontal direction of the support member with respect to the lower floor. A sliding type vibration isolation mechanism having an elastic member that elastically springs, a rolling member that rotatably supports the supporting member on the lower floor so that the supporting member can move in the horizontal direction, and the supporting member that horizontally supports the lower floor. A vibration-isolating device having a rolling-type vibration-isolating mechanism having a resilient member that is resilient.