JPH0369742A - Device for base isolation for building - Google Patents

Abstract

PURPOSE:To achieve effective base isolation by arranging isolators in the same diameter on more than two places of an installation part of a building, by making the isolators stacked in several stages on places where smaller vertical load is applied and by making a plurality of the isolators placed in parallel with each other on places where larger vertical load is applied. CONSTITUTION:Isolators 1, steel rod dampers 2 and lead dampers 3 are regularly arranged to an installation part of a building C. The isolator 1 is made up in such layered structure that a plurality of steel plates are layered and rubber plates are interposed between each of the steel plates, and fixing plates are provided to both the upper and the lower faces of the layered structure. The isolators 1 are arranged along the outer periphery of the building C. On a stair case Ca where smaller vertical load is applied, the isolators 1 in the same diameter are placed in two stages and on places where larger vertical load is applied,the isolators are placed independently or side by side. Thereby the building becomes able to answer to any variation of rigidity.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a seismic isolation building device.

(Prior Art) Conventionally, isolators such as laminated rubber have been proposed as seismic isolation building devices, and this laminated rubber is placed in the installation part of a building to achieve seismic isolation. For example, as shown in Fig. 5, in a part such as vertical member Ca of building C, where the vertical load is small compared to other parts, that is, the axial force is small, and as a result, the horizontal stiffness is large, the horizontal stress is small. If laminated rubber having the same diameter as other parts is used, the movement of the laminated rubber is slow and stress concentration occurs, causing twisting of the seismic isolation device.

Therefore, the diameter of the laminated rubber is reduced in areas where the vertical load is small to adjust the rigidity with other areas.

(Problem to be Solved by the Invention) However, although it is appropriate to install types of isolators corresponding to the horizontal rigidity in order to adjust the rigidity of the entire building, it is necessary to prepare many types of isolators. There are inconveniences that I have to do.

An object of the present invention is to eliminate the above-mentioned disadvantages.

(Means for Solving the Problems) In this invention, isolators 1 of the same diameter are arranged at two or more places on the installation part of the building C, and a plurality of isolators of the same diameter are arranged in parts where the vertical load is small. The isolators are arranged in stacked layers, and one isolator having the same diameter as the above isolator or a plurality of isolators are arranged in parallel in the area where the vertical load is large.

(Example) This invention will be explained in detail below.

In Figure 1, isolator 1 is installed at the installation part of building C.
．． ..., steel rod dampers 2, and lead dampers 3 are arranged regularly. Isolator 1.・・・
Regarding ・, isolators 1 are placed along the outer periphery of building C, and isolators 1 of the same diameter are stacked in two stages in areas where the vertical load is small, such as in the staircase Ca, and isolators 1 of the same diameter are stacked in parallel in areas where the vertical load is large. Alternatively, one isolator 1 may be placed alone to adjust the overall rigidity.

In the staircase section Ca where the vertical load is small, two isolators 1 having the same diameter are stacked, so the specific configuration of this isolator will be explained with reference to FIGS. 2 and 3.

That is, each isolator 1 is made of laminated rubber made by laminating a plurality of steel plates with rubber plates 7 interposed between the steel plates, and has upper and lower mounting plates 11 and 12, respectively. In the upper and lower isolators 1.1, the overlapping mounting is done by bolts 13.1 between the plates 12.11. It is connected with... Also, the installation on the side of building C and foundation is plate 11.
A fixing plate 14.14 is attached to each fixing plate 12 with a bolt 16, and a stud bolt 15.14 is attached to each fixing plate. ... stands up, and the isolators 1, 1 stacked above and below are integrated with the building C and the foundation I through these stud bolts.

In addition, for each isolator 1 arranged in parallel, the upper and lower parts of the isolator are mounted on plates 11 as shown in FIG.
．． Fixing plate 14 with stud bolts 15 erected on 12.
14 is attached, and is attached to the building C and the foundation using stud bolts 15.

In isolator 1, which is arranged exclusively in illumination, the fourth
One isolator 1 shown in the figure is used.

Depending on the degree of rigidity, isolators 1 may be stacked in three or more tiers. In this case, the uppermost isolator is mounted on a fixed plate, and the overlapping part of the isolators is mounted on the opposite side using bolts between the plates. Just combine them.

In addition, although a staircase was used as an example of a part of a building with a small vertical load, as shown in Figure 5, variations in rigidity caused by differences in building levels can be adjusted using the same configuration as in the example. can.

(Effects of the Invention) As described above, according to the present invention, one or more isolators with the same diameter can be arranged in parallel or Since they can be arranged or stacked in two or more tiers to accommodate changes in rigidity, effective seismic isolation can be achieved at low cost and with a simple configuration.

[Brief explanation of drawings]

Figure 1 is a layout diagram of the isolator, Figure 2 is a front view of the isolator in a two-tier stacked state, Figure 3 is a sectional view taken along the line mm in Figure 2, and Figure 4 is the isolator used when arranged in parallel. 5 is an explanatory diagram schematically showing the building. 1... Isolator 11.12... Mounting is on board,
14... Fixed plate, C... Building, K... Foundation. that's all

Claims (1)

[Claims] Isolators with the same diameter are placed at two or more locations on the installation part of the building, multiple isolators with the same diameter are stacked in areas with small vertical loads, and isolators with the same diameter as the above isolators are stacked in areas with large vertical loads. A seismic isolation building device characterized by having one or more isolators arranged in parallel.