JPS627794Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a seismic isolation floor device for protecting precision equipment from earthquakes where the direction of vibration is difficult to identify, or for vibration-generating equipment that generates vibrations whose directionality is difficult to identify. The present invention relates to a seismic isolation floor device for preventing the vibrations from being transmitted to the surrounding area, and particularly an object of the present invention is to provide a seismic isolation floor device that can be applied without significantly changing the floor structure of an existing building.

Embodiments of the present invention will be described below based on the drawings. In Figure 1, 1 is a rectangular seismic isolation floor, on which are placed precision equipment that dislikes vibrations, such as computers, or vibration-generating equipment that generates vibrations, such as reciprocating compressors. will be installed. A plurality of seismic isolation units 2 are attached to the lower surface of the seismic isolation floor 1 in a parallel relationship with each other, and the seismic isolation floor 1 is supported on the existing floor 3 of the building as described below via the seismic isolation units 2. be done.

As shown in FIG. 2, each seismic isolation unit 2 includes a bottom plate 4, a vertical spring 5, and a shock absorber 6. Only the seismic isolation unit 2 attached to the center of the seismic isolation floor 1 has
A plurality of horizontal springs 7 are attached. Fig. 2 shows the seismic isolation unit 2 equipped with the horizontal springs 7, which will be described in detail below. The bottom plate 4 is placed on the existing floor 3 via friction reducing members (e.g., tetrafluororesin plate, roller bearings, etc.) 8 so as to be freely displaceable laterally and smoothly, and a cylindrical lower case 9 is fixed onto the bottom plate 4. On the other hand, a cylindrical upper case 10 with a lid is fixed to the underside of the seismic isolation floor 1, and the lower end of the upper case 10 is fitted to the outer periphery of the upper end of the lower case 9 with an appropriate radial gap.

In both cases 9 and 10, the coiled vertical spring 5 is interposed between the bottom plate 4 and the top of the upper case 10. In addition, the buffer 6
is positioned inside the vertical spring 5, and its upper end is connected to the pin 1.
1, it is rotatably attached to a bracket 12 fixed to the upper case 10, and its lower end is rotatably attached to a bracket 14 fixed to the bottom plate 4, using a pin 13. There is.

The horizontal springs 7 are used to keep the seismic isolation unit 2 attached to the center of the seismic isolation floor 1 stationary at a predetermined position with respect to the existing floor 3, and are arranged radially around the seismic isolation unit 2. (4 in the example)
book) is provided. More specifically, four hook pins 15 are provided on the bottom plate 4 at equal intervals in the circumferential direction.
Correspondingly, four hook pins 16 are planted on the existing floor 3, and a coiled horizontal spring 7 is stretched between both pins 15 and 16. .

Next, the operation of the above-mentioned constituent device will be explained.
Now, when an earthquake accompanied by longitudinal and lateral vibrations occurs, the existing floor 3 that is integrated with the building receives this vibration and vibrates violently. Along with being relaxed, the buffer 6
Vibrations are attenuated and equipment installed on the seismic isolation floor 1 is protected. In particular, when vibrations occur in the lateral direction, the bottom plate 4 is displaced in the lateral direction relative to the existing floor 3 due to the contact between the two cases 9 and 10, and at this time, a frictional damping force is generated by the friction material 8. The above-mentioned vibration is alleviated. When the earthquake subsides, the action of the horizontal springs 7 causes the central seismic isolation unit 2, that is, the seismic isolation floor 1, to return to a predetermined position relative to the existing floor 3.

Here, if the equipment installed on the seismic isolation floor 1 generates vibrations, this vibration will be transmitted to the existing floor 3, ie, the building, in a relaxed manner.

Now, to explain a little about the existing floor 3, in most of the floor structures of buildings in which this type of seismic isolation device is installed, as shown in Fig. Existing floor 3 via support column 18
Generally, it has a double-floor structure with a However, the vertical distance between the foundation floor 17 and the existing floor 3 is extremely small, 150 to 200 mm, and it is impossible to incorporate the above-mentioned seismic isolation unit 2 between the two floors 3 and 17. Therefore,
As in the present invention, the seismic isolation unit 2 is installed on the existing floor 3.
If the seismic isolation floor 1 is installed through the base, the only repair required is to connect each support column 18 with a reinforcing material 19, and there is no need to make any major changes to the existing floor structure of the building itself. In addition, the code 2 in Figure 3
0 indicates equipment installed on the seismic isolation floor 3.

Although the embodiments have been described above, the present invention is not limited thereto, and includes, for example, the following cases.

The biasing forces of the vertical springs 5 and the horizontal springs 7 may be adjustable, so that the supporting posture (particularly for horizontal support) and the lateral position of the seismic isolation floor 1 relative to the existing floor 3 may be adjustable.

The number of horizontal springs 7 can be any number as long as it is three or more, and all horizontal springs 7 may be attached to each seismic isolation unit 2.

As is clear from the above, the present invention
It has various effects as follows.

Since vibration transmission in the vertical and horizontal directions between the existing floor 3 and the seismic isolation floor 1 is alleviated, the seismic isolation floor 1
The equipment installed on the seismic isolation floor 1 can be effectively protected from earthquakes, and if the equipment installed on the seismic isolation floor 1 generates vibrations, the vibrations are prevented from being transmitted to the entire building. In particular, in the event of an earthquake accompanied by lateral vibrations, the lower end of the upper case 10 comes into contact with either the inner periphery or the outer periphery of the upper end of the lower case 9, causing the bottom plate 4 to slide over the existing floor. 3, and can reliably alleviate lateral vibrations.

Since both ends of the shock absorber 6 are rotatably connected to the seismic isolation floor 1 and the existing floor 3, one shock absorber can attenuate vibrations in the vertical and horizontal directions. The structure is simpler and can be implemented at a lower cost than when separate shock absorbers are provided for the vertical and horizontal directions.

The seismic isolation floor 1 and the seismic isolation unit 2 are standardized and set, and can be easily installed without major modification to the floor structure of an existing building.

[Brief explanation of the drawing]

Figure 1 is a perspective view from below of a seismic isolation floor with a seismic isolation unit installed, Figure 2 is a longitudinal sectional view of the main part when the seismic isolation floor shown in Figure 1 is installed on an existing floor, and Figure 3
The figure is a sectional view showing a seismic isolation floor device together with the existing floor structure of a building. 1... Seismic isolation floor, 2... Seismic isolation unit, 3... Existing floor, 4... Bottom plate, 5... Vertical spring, 6... Shock absorber, 7... Horizontal spring.

Claims (1)

[Scope of Claim for Utility Model Registration] A seismic isolation floor is supported on the existing floor of a building via a plurality of seismic isolation units, and each of the seismic isolation units is smoothly displaceable in the lateral direction on the existing floor. a mounted bottom plate; a vertical spring interposed between the bottom plate and the seismic isolation floor;
located inside the vertical spring and having one end attached to the bottom plate;
a shock absorber whose other end is connected to the seismic isolation floor, and a cylindrical lower case fixed on the bottom plate;
a covered cylindrical upper case fixed to the lower surface of the seismic isolation floor, and the lower end of the upper case is arranged in an appropriate radial direction to either the inner periphery or the outer periphery of the upper end of the lower case. The vertical spring is interposed between the bottom plate and the top of the upper case in both cases, and at least one of the seismic isolation units is fitted with a spacing of
A seismic isolation floor device, characterized in that it is always positioned to stand still at a predetermined position with respect to the existing floor by a plurality of horizontal springs.