JPH1181741A - Sliding base isolation element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To systematize parallelism of plates and mounting of them by arranging building and footing ground on both up and down plates to generate pressure in a viscous fluid caused by load, and sliding two plates each other under the balance between capacity of an accumulator and pressure of sealed gas. SOLUTION: A sliding base isolation element is constituted of O-ring shaped seal members 3 and 4 for sealing the periphery between upper plate 1 and lower plate 2, a viscous fluid 5 sealed between them and accumulator 6. One or the other of both up and down plates includes a fluid reservoir, capacity of the fluid is increased as a whole, and for example, accumulator, etc., are mounted between footing and building. Gas having appropriate pressure is sealed into each of the accumulators, and load imposed on the accumulator 6 keeps its balance. Accordingly, friction between seal members 3, 4 and up and down plates 1, 2 is adjusted by adjusting pressure of the accumulator 6, etc., and influence by wind, etc., is controlled to set. By the constitution, it is effective to lightweight load structure such as low-rise residence, etc., mechanism is simplified to have reliability on trouble and elapsed variation therein, and maintenance can be easily executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Technical field to which the present invention pertains] Seismic isolation technology for buildings, civil engineering structures, important properties, etc.

[0002]

[Prior Art] It is generally adopted as a seismic isolation mechanism that a laminated rubber is used between the ground and the foundation of a building structure. The effect of laminated rubber on earthquakes is that the vibration of the earthquake is not directly transmitted to the building, but at the same time, there is a disadvantage that the resonance of the mass and spring system composed of the building and the laminated rubber occurs. Therefore, a seismic isolation element that encloses a viscous fluid between two plates can be considered as a mechanism that allows each of them to slide freely between the building and the foundation ground with almost no natural vibration. This mechanism has the disadvantage that the accuracy required for the parallelism of the two plates is extremely high, and high accuracy is required when mounting it on an actual building structure.

[0003]

In seismic isolation technology, if the seismic isolation element has as few spring elements in the vibration direction as possible while supporting the huge weight of the load, the residual resonance vibration due to resonance need not be considered. Better, and the need for accompanying damping elements is unnecessary or simplified. In addition, if the spring constant is small, the seismic isolation effect can be sufficiently provided even in the case of a lightweight load. As such a seismic isolation element, a seismic isolation element in which lubricating oil is interposed between two plates is conceivable, but the accuracy of the plate and the accuracy required when actually mounted are extremely high. Therefore,
A mechanism that does not require such high precision has been devised.

[0004]

[Means for Solving the Problems] In order to solve the above-mentioned problems, first, a viscous fluid is sealed between two upper and lower plates arranged substantially in a plane so that the upper and lower plates can freely slide horizontally with respect to each other. . Since the space between the upper and lower sheets is relatively narrow and the volume of the viscous fluid interposed between them is small, high accuracy is required for both manufacturing and mounting to buildings. Therefore, install a pressure accumulator that holds the required volume. When the building and the foundation ground are attached to the upper and lower two plates, pressure is generated in the viscous fluid due to the initial load due to the load of the building, and the balance between the volume of the accumulator and the pressure of the enclosed gas is appropriate. The two boards can slide with each other while maintaining the space. By providing a pressure accumulator in this way, adjustment after mounting is easier. Furthermore, by adjusting the pressure of the accumulator according to the magnitude of the load, it is possible to adjust the amount of initial deflection of the seal member.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above-mentioned problems, an embodiment according to the present invention employs O-ring-shaped seal members 3 and 4 for sealing the periphery of an upper plate 1 and a lower plate 2 as shown in FIG. It consists of a viscous fluid 5 and an accumulator 6 sealed in it.

The second means is to increase the volume of the fluid as a whole by providing fluid reservoirs 9 and 10 on either the upper plate 7 or the lower plate 8 as shown in FIG.

[0007]

[Embodiment] An embodiment of the sliding seismic isolation element of the present invention as shown in FIG. 3 will be described. The seismic isolation element 14 is attached between the foundation 12 and the building structure 13 as shown in FIG. After mounting, each accumulator 15,
Fill the gas at an appropriate pressure into 16 etc. to balance the loads applied to multiple seismic isolation elements.

[0008]

[Effects of the Invention] As described above, the present invention has the following effects. In other words, the extremely simple seismic isolation element causes very little movement to be transmitted to the upper building structure by vibrating from the ground due to an earthquake or the like and the large displacement sliding up and down the seismic isolation element. . In addition, since the pressure of the seismic isolation element can be easily adjusted, maintenance is easy and the status of the seismic isolation element can be checked at any time. Since this seismic isolation element has almost no spring-like element, the resonance of the building hardly occurs. In addition, slight resonance is expected to be absorbed by the sliding friction between the enclosed viscous fluid and the plate. Although the destruction of structures such as buildings is mainly due to large displacements at low periods, the destruction of structural details can occur even with relatively high-period vibrations. Regardless of, the slide between up and down occurs, so it is possible to escape vibration for all periods. By escaping vibration, energy is not transmitted to the building, so there is no need to exert large damping force. The features can be summarized as follows. (1) The friction between the seal member and the upper and lower plates can be adjusted by adjusting the pressure of the pressure accumulator. (2) Lightly moves when an earthquake or disturbance exceeding a certain magnitude occurs, causing no resonance because the spring constant is small. (3) Even a light load is effective, so it is also effective for low-rise houses. Since the four mechanisms are simple, there is little fear of failure and aging, and maintenance is easy.

[Brief description of the drawings]

[Fig. 1] Seismic isolation element 1

[Fig. 2] Seismic isolation element 2

[Figure 3] When installed in a building

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper plate 2 Lower plate 3 O-ring-shaped sealing member 4 O-ring-shaped sealing member 5 Viscous fluid 6 Accumulator 7 Upper plate 8 Lower plate 9 Fluid reservoir 10 Fluid reservoir 11 Viscous fluid 12 Foundation 13 Building structure 14 Seismic isolation element 15 Accumulator 16 Accumulator

Claims (2)

[Claims] 1. A seismic isolation element for a seismic isolation of a building, comprising a pressure accumulator for regulating pressure and volume of a viscous fluid. 2. A seismic isolation element according to the above-mentioned seismic isolation element, wherein a groove for adjusting the capacity is provided in both or one of the two plates.