JPH11153184A - Floating type base isolation building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation building at low cost capable of restraining vibration in the vertical direction and in the horizontal direction by an earthquake and locking work and capable of preventing damage due to sloshing. SOLUTION: It is furnished with a nesting structure formed of a plate member 13 provided on a surface of a side wall 6 of a pool filled with liquid 4 to float a building foundation and a locking preventive means 5 formed by a link mechanism provided between a building lower surface and a pool floor surface, the nesting structure directing the plate member 13 in the vertical direction is provided at a central part in the vertical direction of the building foundation side wall 12, and the nesting structure directing the plate member 13 in the horizontal direction is provided on a part of the building foundation side wall 12 near the pool floor surface and a pool liquid surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating seismic isolation building applied to a thermal power plant, a nuclear power plant and the like.

[0002]

2. Description of the Related Art As a conventional floating type three-dimensional seismic isolation device, "Summary of seismic isolation for nuclear structures"("A Review
of Seismic Isolation for Nuclear structures '' Dame
s Moore, EPRI Repost 1979 pp.44-46, and “Floating Plants for Seis
mic Protection '' by Busy NM Nuclear Application
sVol.6 1969).

[0003] As shown in Fig. 3 (a), a foundation 14 is floated on a pool 6 as shown in Fig. 3 (a), and a building 1 is placed thereon. Was not specifically considered.

A conventional nested viscous damper used in a conventional seismic isolation device is described in "Development and Application of Three-Dimensional Seismic Isolation for Vibration of Building During Earthquake and Non-Earthquake"("Develo
pment and Application of 3D Isolation Systems Capa
ble of Accomodating Seismic Vibrations of Building
s "D.Heiland and FMWeber Post-SMIRT Conference Seismic Isolation Semi-Energy Dissipation and Vibration Control of Structures 1993 p
pp. 161-171).

[0005] As shown in FIG.
A viscous damper which is disposed between the base 4 and the foundation 14 and is provided with a nesting 22 and a nesting cylinder 23 in a nesting container 21 and is filled with the viscous body 15 and has a function of a spring. Was not.

[0006] Further, as a conventional three-dimensional seismic isolation device other than the floating type, “Study on Three-Dimensional Vibration Isolation / Seismic Isolation Structure of Building” (Fujita et al., JSME Journal of Mechanical Mechanics, Measurement and Control Vol. A 1995) pp. 378).

As shown in FIG. 4, horizontal seismic isolation is performed by a laminated rubber 16 containing a lead plug, vertical seismic isolation is performed by a coil spring 18, and a locking prevention device is performed by using a laminated rubber guide 17. Met.

[0010] The rocking means that since the center of gravity of the building exists above the laminated rubber 16, a moment acts on the laminated rubber 16 as shown in FIG.

[0009]

The conventional seismic isolation devices have the following problems, respectively. That is, in the case of the seismic isolation device shown in FIG. 4, a horizontal seismic isolation device and a vertical seismic isolation device are required, respectively, which has led to an increase in cost.

In the case of the floating type three-dimensional seismic isolation device shown in FIG. 3 (a), a building is simply floated in a water pool, and a device for applying horizontal and vertical restoring force, excessive relative displacement A device that suppresses sloshing, a device that suppresses sloshing, and a device that suppresses rocking are required, but the essential elements of these three-dimensional seismic isolation devices have not been clarified.

Further, in the case of a viscous damper having a nested structure shown in FIG. 3B, it has a damping function but does not have a spring function and requires a device having a separate restoring force characteristic. Also,
It required a viscous fluid.

An object of the present invention is to solve the above problems and provide a floating three-dimensional seismic isolation device that can be actually implemented.

[0013]

Means for Solving the Problems (1) A floating type seismic isolation building according to the first aspect of the present invention is a floating type seismic isolation building having a seismic isolation structure with a building foundation floating in a pool liquid. It is characterized in that the plate member provided on the wall surface and the plate member provided on the base wall of the building have a nested structure, and locking prevention means forming a link mechanism is provided between the lower surface of the building and the floor surface of the pool.

In the above, when an earthquake occurs and the vibration propagates, a relative displacement is generated between one plate member forming the nested structure and two plate members sandwiching the plate member, and the displacement in the pool is caused. The movement of the liquid causes a damping effect on the vibration.

Further, in the case of vibration in which the amplitude of the vibration is large and the plate members come into contact with each other, the plate member exerts a spring effect, so that the building is given the restoring force of the spring together with the vibration damping effect.

In the case where the transmitted vibration causes a rocking action to rotate the building, a locking mechanism is formed by a link mechanism, and the entirety of the vibration varies only at the same height in the vertical direction. Locking action can be suppressed.

(2) The second aspect of the present invention is the above-mentioned invention (1).
In the floating type seismic isolation device described in the above, the plate member forming the nesting structure provided in the vertical center portion of the building foundation side wall is oriented vertically, and the nesting structure provided on the building foundation side wall portion close to the pool floor surface is configured. The plate member is oriented in a horizontal direction.

In the above, since the nested structure in which the plate member is oriented in the vertical direction is provided, when the horizontal vibration propagates, the nested structure provided on the wall perpendicular to the direction of propagation of the vibration causes the vibration. The nested structure provided in the vibration propagation direction generates a spring effect together with the vibration damping effect, and the horizontal vibration propagated to the building is attenuated and the building has a spring restoring force. To give a horizontal seismic isolation effect on the building.

Further, since the nesting structure in which the plate member is oriented in the horizontal direction is provided, when the vibration in the vertical direction propagates, the damping effect and the spring effect due to the movement of the liquid are generated.
A vertical seismic isolation effect occurs for the building.

Therefore, in the present invention, in addition to the effects of the above invention (1), it is possible to obtain a reliable seismic isolation effect against an earthquake that propagates horizontal vibration and vertical vibration.

(3) The third aspect of the present invention is the above-mentioned invention (1).
Alternatively, in the floating seismic isolation building described in (2), a plate member constituting a nested structure provided on a building base side near the surface of the pool liquid is oriented in a horizontal direction.

In the present invention, a nesting structure in which the plate member is oriented in the horizontal direction is provided at a portion near the pool liquid surface,
Since the wave generated on the surface of the pool liquid is suppressed, it is possible to reduce the damage due to sloshing in addition to the effect of the invention (1) or (2).

(4) The invention of claim 4 provides the invention (1).
The floating type seismic isolation building according to any one of (1) to (3) is characterized in that three sets of plate members constitute a nested structure.

In the present invention, one set of nested structures is
Since it is formed of a single plate member and can be manufactured at low cost, it is possible to realize a low-cost seismic isolation device in addition to the effects of the inventions (1) to (3).

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A floating type seismic isolation building according to an embodiment of the present invention will be described with reference to FIGS.

The floating type seismic isolation building according to the present embodiment shown in FIGS. 1 and 2 is composed of the building 1 floating in the liquid 4 filled in the pool wall 6, the pool wall 6 and the building base wall 12. A plurality of vertical spring / damper devices 2 disposed between the upper and lower portions, a plurality of horizontal spring / damper devices 3 disposed between the upper and lower vertical spring / damper devices 2, the building 1 And a locking prevention device 5 arranged between the lower surface of the pool and the bottom surface of the pool.

As shown in FIG. 1A, each of the above-mentioned vertical spring / damper devices 2 has two rectangular faces, each face facing upward and downward, and one side fixed to the face of the pool wall 6. It is formed by a leaf spring 13 and one rectangular leaf spring 13 that is disposed between the two leaf springs 13 and faces upward and downward and has one side fixed to the building foundation wall 12.

As shown in FIGS. 1 (a) and 1 (b), each of the horizontal spring / damper devices 3 has one side formed on the surface of the pool wall 6 similarly to the vertical spring / damper device 2. The rectangular leaf springs 13 are formed by two fixed rectangular leaf springs 13 and one rectangular leaf spring 13 having one side fixed to the building foundation wall 12.
Is the vertical direction.

Further, the above-mentioned locking prevention device 5 is shown in FIG.
As shown in (c), the link mechanism 9 and the slide mechanism 10
In the link mechanism, only one joint portion is pin-supported on the bottom of the pool via the pin support device 11, and the other joint portions are free to move horizontally in the horizontal direction. A slide mechanism 10 for restricting the movement in the direction is provided.
Consists of a roller 19 and a receiver 20.

In this embodiment, the seismic isolation effect is obtained by floating the building 1 in the liquid 4 filled in the pool wall 6, but the horizontal spring / damper device 3, the vertical spring / damper device. 2, and by providing the locking prevention device 5, the seismic isolation effect is increased, and the operation of each device will be described in detail below.

As for the horizontal spring / damper device 3, as shown in FIG. 2 (a), the earthquake propagates to the pool wall 6 and the relative movement 8a of the building to the left with respect to the pool wall 6. Occurs, a horizontal spring and damper device 3a provided with a leaf spring 13 parallel to the direction of the movement 8a of the building.
Since one leaf spring 13 moves in and out between two leaf springs 13, the liquid 4 generates liquid movements 7 a and 7 b in a narrow gap between the leaf springs 13 due to the pump action and propagates to the building 1. A vibration damping effect occurs.

On the other hand, in the horizontal spring / damper device 3b provided with the leaf spring 13 in a direction perpendicular to the movement 8a of the building, the leaf springs 13 adjacent to each other come into contact and bend to act as a spring. To the spring restoring force.

As shown in FIG. 2B, the vertical spring / damper device 3 is arranged in a horizontal direction when a movement 8b of the building relative to the pool wall 6 occurs downward. The leaf spring 13 of the installed vertical spring / damper device 2
Bends to generate a spring effect, and at the narrow gap between the leaf springs 13, a movement 7 c of the liquid is generated, and a damping effect of vibration propagating to the building 1 is also generated.

Since the vertical spring and damper device 2 installed near the liquid surface has the function of suppressing the wave generated on the liquid surface, it is possible to prevent sloshing due to the liquid surface wave. is there.

With respect to the vertical and horizontal spring / damper devices 2 and 3, by adjusting the spring constants of the respective leaf springs 13, the natural frequencies in the horizontal and vertical directions are sufficiently higher than the dominant frequency of the input earthquake motion. It is possible to make the building 1 more stable while reducing the size and avoiding resonance.

The locking device shown in FIG. 2 (c) is always inclined when the building 1 is going to be locked, so that the diamond-shaped portion of the link mechanism 9 moves up and down. At this time, the vertical displacement of each diamond-shaped portion becomes equal due to the inherent characteristics of the link mechanism 9. Therefore, the inclination of the building 1 is restrained, and locking is prevented.

The slide mechanism 10 provided on the bottom surface of the building 1 is provided to allow the link mechanism 9 to freely expand and contract horizontally when the link mechanism 9 moves up and down. This is for not restricting the movement. The pin support device 11 is provided to prevent the link mechanism 9 itself from shifting during an earthquake.

[0038]

The floating type seismic isolation device of the present invention has a nested structure formed by a plate member provided on the side wall surface of the pool filled with the liquid floating the building foundation and a plate member provided on the building foundation side wall. By providing a locking mechanism formed by a link mechanism provided between the lower surface of the building and the floor of the pool, it is possible to attenuate vibrations propagating to the building and to provide the building with a spring restoring force. As a result, the locking effect can be suppressed, and a building having a seismic isolation effect can be realized.

Further, a nested structure in which the plate member is oriented vertically is provided at the center in the vertical direction of the foundation wall of the building, and a nested structure in which the plate member is oriented in the horizontal direction is provided on the foundation side wall portion near the pool floor. With this configuration, it is possible to obtain a reliable seismic isolation effect against an earthquake that propagates horizontal and vertical vibrations.

Further, by providing the nesting structure in which the plate members are oriented in the horizontal direction on the base side of the building near the surface of the pool liquid, it is possible to suppress the damage caused by the sloshing of the liquid surface. Is formed of three plate members, thereby realizing a low-cost seismic isolation building.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a floating type seismic isolation building according to an embodiment of the present invention, wherein (a) is a side cross-sectional view and (b) is A- of (a).
FIG.

FIGS. 2A and 2B are explanatory diagrams of the operation of the floating type seismic isolation building according to the embodiment, wherein FIG. 2A shows a case of horizontal vibration, FIG. 2B shows a case of vertical vibration, and FIG. It is.

3A and 3B are explanatory diagrams of an example of a conventional device, wherein FIG. 3A is a diagram illustrating a floating type seismic isolation building, and FIG. 3B is a diagram illustrating a nested viscous damper.

4A and 4B are explanatory diagrams of another example of the conventional device, in which FIG. 4A is a conceptual diagram of the three-dimensional seismic isolation device, FIG. 4B is an actual element diagram of the three-dimensional seismic isolation device, and FIG. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Building 2 Vertical spring / damper device 3 Horizontal spring / damper device 4 Liquid 5 Locking prevention device 6 Pool wall 7 Liquid movement 8 Building movement 9 Link mechanism 10 Slide mechanism 11 Pin support device 12 Building base wall 13 Plate spring 19 About 20

Claims (4)

[Claims] 1. A floating type seismic isolation building having a seismic isolation structure with a building foundation floating in a pool liquid, wherein a plate member provided on a pool side wall surface and a plate member provided on a building foundation side wall have a nested structure. A floating seismic isolation building characterized in that a locking prevention means serving as a link mechanism is provided between the lower surface of the building and the floor of the pool. 2. A plate member constituting a nested structure provided at a vertically central portion of a building foundation side wall is oriented vertically, and a plate member constituting a nested structure provided at a building foundation side wall portion near a pool floor is horizontally oriented. The buoyant seismic isolation building according to claim 1, wherein the building is directed to a building. 3. The floating seismic isolation building according to claim 1, wherein a plate member forming a nesting structure provided on a base side of the building near the surface of the pool liquid is oriented in a horizontal direction. 4. The buoyant seismic isolation building according to claim 1, wherein three sets of plate members form a nested structure.