JPS63300160A - Earthquake damping floor structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] □ The present invention relates to a seismic isolation floor structure in which flooring is laid on a base via a seismic isolation device.

[Conventional technology]

In order to maintain the reliability and durability of precision machinery such as computers and precision processing machines, even if seismic force (ground vibration) from an earthquake or passing vehicles acts on the building, the excitation force is directly applied to the equipment. There is a need for support through seismic isolation devices to prevent vibrations from being transmitted, and various seismic isolation floor structures for this purpose are being studied.

Conventional seismic isolation floor structures of this type include a support mechanism that is placed on a sliding plate and elastically held in place by a spring that resists horizontal movement, on a base such as a floor slab or foundation. It has been proposed to lay a flooring material on top of it via beams or the like.

[Technical problem to be solved by the invention]

However, in such a conventional seismic isolation floor structure, a large number of roller bearings, etc. are used as a sliding mechanism, and a large number of coil springs, etc. must be arranged for elastic support from each direction, making the mechanism complicated. Met.

Additionally, due to the mechanism, there was a problem in that minute vibrations were not absorbed and passed through to the floor surface.

Therefore, recently, seismic isolation flooring has been developed that uses elastic materials with excellent damping performance such as rubber, and supports the flooring with rubber-like laminated elastic materials that improve vertical strength by alternately laminating this and reinforcing plates. structure is proposed.

However, when using this type of laminated elastic body (laminated rubber), in order to provide a low natural frequency that exhibits a sufficient photographic insulation effect against seismic motion, a large supporting load, that is, a supporting area of m It is necessary to increase the permissible load.

On the other hand, the above-mentioned laminated elastic material (laminated rubber) has a high spring constant in the vertical direction and a large allowable load, but has a relatively small spring constant in the horizontal direction, and horizontal displacement is also limited by buckling, so it is generally used for flooring. The supporting load is small (for example, 1 to 5
50 to 500 tons/for supporting buildings
It had to be set much smaller than a single location.

In this way, in conventional seismic isolation floor structures using laminated rubber, the supporting load must be increased in order to have sufficient vibration isolation effect, but due to the problem of buckling, the supporting load must be set small. There was a contradiction.

[Means for solving technical issues]

The present invention installs a multi-stage seismic isolation device in which a plurality of seismic isolation layers made up of a plurality of laminated elastic bodies connected via stabilizing plates in the vertical direction is installed on a base in a predetermined vertical and horizontal arrangement. The above objective is achieved by a seismic isolation floor structure in which vertical and horizontal beams are installed on the seismic isolation device, and flooring materials such as floor panels are laid on top of these beams.

〔Example〕

The present invention will be specifically described below with reference to the drawings.

FIG. 2 is a plan view of one embodiment of the seismic isolation floor structure according to the present invention, and FIG. 3 is a sectional view taken along line m-nr in FIG. 2.

In FIGS. 2 and 3, a plurality of multi-stage seismic isolation devices 2 are installed in a predetermined vertical and horizontal arrangement on a base 1 consisting of a concrete foundation or a floor slab, etc. An array of vertical and horizontal beams 3.4 is installed. For example, it is preferable to use H-shaped steel as these beams 3.4.

In the illustrated example, the multi-stage seismic isolation device 2 is installed at five locations, for example, at intervals of 2 m and 50 cm in the vertical direction, and at three locations, for example, at intervals of 2 m in the horizontal direction.

In the illustrated example, the beams 3.4 made of H-shaped steel or the like are arranged in 5×9 rows vertically and horizontally.

In the illustrated example, dampers 5 for attenuating horizontal acceleration are arranged at two locations in the center. This damper 5 includes, for example, a stirring rod 5A fixed to t3 and a base li.
t and a container 5B in which a vibration absorbing agent such as sand or pinch is stored, and is configured to generate a damping force when the stirring rod moves within the vibration absorbing agent during vibration.

However, as the damper 5, other types of damping devices, ie, various types of dampers such as a viscous type or a viscoelastic type, can be conveniently used.

In FIG. 3, pedestals 6 are fixed on the beams 3.4 with a predetermined pinch, and flooring 7 is placed on these pedestals 6.
has been installed. For example, 50 cranes
Floor panels of about 5Qw can be used, and the floor surface is constructed by laying these floor panels together.

A fixed floor 8 is provided around the seismic isolation floor made of the floor material 7, and a cover (M alignment) 9 of about 20 cm width is provided between the fixed floor 8 and the periphery of the seismic isolation floor 7. An overhang portion 13 is formed.

FIG. 1 shows details of the end portion of the seismic isolation floor structure in FIGS. 2 and 3.

11th! 1, a stopper 10 having a buffering function and made of a rubber-like elastic material or a compressed air bag is attached to the end face of the vertical and horizontal beams 3.4 made of H-shaped steel or the like. There is a beam 3 between the vertical wall surface 11
．． A space 12 (for example, a space of 150 fi) is provided to allow a horizontal displacement of 4.

In the illustrated example, the overhang portion 13 formed on the fixed floor 8 protrudes so as to be substantially in contact with the upper surface of the floor material (floor finishing material) 7 supported by the pedestal 6. That is, construction is performed so that no extra gap is created in the overlapping portion 9 between the lower surface of the overhang portion 13 and the upper surface of the flooring 7.

In the illustrated example, the fixed bed 8 (its overhang portion 13) is placed over the top surface of the floor material 7, but the structure may be such that the floor material 7 is placed over the top surface of the fixed bed. can.

FIG. 4 is a side view of the multistage seismic isolation device 2, and FIG. 5 is a sectional view taken along line V-V in FIG. 4.

4 and 5, the multi-stage seismic isolation device 2 is made of laminated elastic bodies (laminated rubber) at multiple locations (four locations in the illustrated example).
15 are stacked vertically (four in the illustrated example), and the upper and lower end surfaces of the laminated elastic bodies 15 at each stage are connected to the stabilizer plate 1.
They have a structure in which they are connected to each other at 6 points.

Each laminated elastic body 15 has a structure in which a rubber-like elastic material and reinforcing plates such as steel plates or hard plastic plates are alternately integrated. Fastened and fixed.

5th FI! J shows a state in which the multi-stage seismic isolation device 2 in FIG. 4 is displaced in the horizontal direction due to earthquake force or the like.

As shown in FIGS. 4 and 5, according to the multi-stage seismic isolation device 2 configured by connecting the laminated elastic bodies 15 as element elastic bodies with the stabilizing plate 16, each upper and lower end surface of each stack rr1 elastic body 15 are restrained by the stabilizing plate 16, resulting in a stable structure as a whole.

Therefore, even if an earthquake force acts on it, as shown in Figure 6, it is possible to obtain a large horizontal displacement absorption capacity without buckling. The support mW per unit can be significantly increased.

FIGS. 7 and 8 are side views of a single laminated elastic body 18 and a side view when horizontal displacement occurs due to an earthquake force.

As is clear from FIG. 8, the single laminated elastic body 18 that does not use the stabilizing plate 16 (FIG. 4) becomes unstable and tends to buckle when horizontal displacement occurs, so the support tube m must be made larger. That is impossible.

From the above, according to the multistage seismic isolation bag "f12" in which the laminated elastic bodies (laminated rubber) 15 are connected by the stabilizing plate 16, the natural frequency is small, it is stable against buckling, and the allowable displacement (horizontal displacement) It is possible to obtain a seismic isolation floor structure that can increase the oscillation rate, exhibit a large seismic isolation and vibration isolation effect against vibrations of a wide range of frequencies, and at the same time reliably attenuate even minute vibrations.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a multi-stage seismic isolation device in which a plurality of seismic isolation floors made of a plurality of laminated elastic bodies connected via stabilizing plates are connected in the vertical direction is installed on a foundation. They were installed in a predetermined vertical and horizontal arrangement, beams were installed vertically and horizontally on top of these multiple multi-stage seismic isolation devices, and flooring materials such as floor panels were laid on top of these beams to form a seismic isolation floor structure. The laminated elastic body has a sufficiently low specific motion number to support the load, and at the same time is stable against buckling, allowing the horizontal permissible displacement to be set to a large value.
A seismic isolation floor structure that is also effective for insulating microvibrations can be obtained.

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view showing the main parts of an embodiment of a seismic isolation floor structure according to the present invention, FIG. 2 is a structural plan view of a seismic isolation floor structure according to an embodiment of the present invention, and FIG. Fig. 4 is a side view illustrating a multi-stage seismic isolation device; Fig. 5 is a horizontal sectional view taken along line V-V in Fig. 4; , Figure 6 is a side view showing the state in which the multi-stage seismic isolation device of Figure 4 is horizontally displaced, and Figure 7 is! FIG. 8 is a side view of a seismic isolation device made of a laminated elastic body made of R-Germany. FIG. 8 is a side view showing the seismic isolation device of FIG. 7 in a horizontally displaced state. 1-・・・・・・Foundation, 2−−−1・・−Multi-stage seismic isolation device, 3.4-1111-Beam, 7−・・−・−−−−1 Floor material, 15-----Laminated elastic body, 16----- Stabilizer. Agent Patent Attorney Yasushi Ooto Figure 1 Figure 4 / 3, 4 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] (1) A multi-stage seismic isolation device in which multiple layers of seismic isolation layers made up of multiple laminated elastic bodies connected via stabilizing plates are connected in the vertical direction is installed on the foundation in a predetermined vertical and horizontal arrangement, and these multi-stage A seismic isolation floor structure consists of installing vertical and horizontal beams on a seismic isolation device, and laying flooring materials such as floor panels on top of these beams.