JPS61196078A - Float earthquake damping apparatus - 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] [Industrial Application Field] This invention provides a device that has a seismic isolation effect against seismic forces, etc., at the bottom of a rigid structure building such as a steel concrete structure. Regarding floating seismic isolation structures.

[Conventional technology]

Many architectural structures are built directly into the ground using slab foundations or pile foundations. Therefore, when an earthquake occurs, large seismic waves are transmitted to buildings.

In other words, buildings require strict seismic design,
Columns and beams have large cross-sectional dimensions. Therefore, the amount of reinforcing bars and steel frames increases, contributing to an increase in the construction cost of buildings. Furthermore, in buildings with solid foundations, the problem of uneven settlement occurs, which causes the buildings to tilt or collapse over a long period of time.

By the way, there is a seismic isolation structure as a means to solve such problems. This is intended to reduce the seismic force input to the building itself, and at the same time to measure the dissipation and attenuation of energy using viscous materials, making it easier to design the building's repairs.

Conventionally, for example, buildings with this type of base isolation structure were installed so that a rigid structure was installed so that the lower part of the structure formed a predetermined space between it and the ground; I was able to do it! It is known that a plurality of horizontal seismic isolation devices are installed separately in a cabinet so as to support the vertical load of a rigid structure.

[Problem that the invention seeks to solve]

However, in conventional buildings with seismic isolation structures, multiple horizontal seismic isolation devices are installed discretely at the bottom of the structure, and the horizontal seismic isolation devices are designed to absorb the vertical load of the structure. It receives everything. Therefore, the lifespan of the entire building also depends on the horizontal seismic isolation device.

Now, if we consider the horizontal seismic isolation device mentioned above,
Horizontal seismic isolation devices have many problems in their mechanical structure, materials, etc. For example, the material deteriorates due to corrosion and bacterial decay, and it also deteriorates over time and under high nuisance conditions, resulting in a lack of durability and reliability.

This invention was made in view of the above-mentioned $ practice, and by receiving most of the vertical load of a building by a seismic isolation device other than the horizontal seismic isolation device, the entire female relic has greater durability, reliability, and The aim is to create an AM-isolated structure with stability, and also to provide a seismic isolation structure that can extend its lifespan.

[Means for solving problems]

This invention provides a seismic isolation system in which a foundation board is provided underground, a structure is installed above the foundation board so that a space is formed therebetween, and the structure is supported from the foundation board within the space. In addition to disposing the device, the fL# material is interposed.

The fluid material used in this invention may be asphalt, water, bentonite liquid, or oil.

Further, in the present invention, it is desirable to fill the space formed between the lower part of the structure and the ground on the side of the lower part of the structure with water, bentonite liquid, or the like.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. The embodiments shown in these figures are cases in which the present invention is applied to a high-rise building having a rigid structure built on relatively good ground.

First of all, FIG. 1 is a diagram showing the entire embodiment of the present invention. In Ruri, symbol A is the ground, and AI is the fill soil. B is a structure, Bl is a structure foundation (hereinafter referred to as foundation), and B2 is an upper part of the structure. 1 is the foundation board, 2 is the horizontal seismic isolation device, 3 is the structure foundation board, 4 is the viscous fluid material (here, asphalt is used), 5 is the sliding wall, 6 is the structure foundation side It (hereinafter referred to as base 111m) 7 is a fluid material (water is used here).

FIGS. 2 to 4 are diagrams for explaining the procedure for constructing structure B including a seismic isolation device.

(1) First, as shown in diagram M2, the ground A is excavated into a dish shape with a horizontally spread bottom. At the bottom of this excavated hole, a thin plate-shaped foundation plate l, which is a solid foundation, is poured. The superstructure 'Ill!' is placed on top of the poured foundation plate. A plurality of horizontal seismic isolation devices 2, 2°, etc. for supporting the IB are installed discretely at predetermined locations.

(11) Next, as shown in Figure 3, the structure foundation board 3 is installed on the top of the horizontal seismic isolation 2゜2,... Build a box-shaped foundation Bl in which a space is formed. Between the constructed foundation board l and the structure base f11f115, also!
! 5 and the base @ag6, gaps are formed between each. The space formed between the foundation board 1 and the structure foundation board 3 is filled with asphalt 4, which is as soft as honey at a temperature of 15±2°C. Also.

Water 7 is poured into the upper space, that is, the space formed by the wall 5 and the base side panel 6.

At that time, the weight of structure B, asphalt 42 and water 7
The wall 5 is erected while maintaining the horizontal position of the force between the amount of earth pressure and the earth pressure of the filling ± Al. When the foundation @l, the service 5 and the foundation board B1 are completed,
As shown in Fig. 4, the upper part of the structure B2 is being constructed successively upwards on the foundation board Bl. cormorant.

Finally, as shown in Figure 1, when the upper part of the structure B2 is completed, the structure *B is supported by 90 to 95 inches of its weight by the buoyancy of the asphalt 4 and the water 7, and the cutting 05
~1Ochi's X child horizontally ahead s# device 2.2. It will be supported by...

The structure constructed as above WB&! , It has the effect of [exemption] against the land. In other words, this seismic isolation effect is based on the following principle.
．． ... has been cut off from the ground 111A and is floating on the fluid material. Therefore, the natural period of Structure-B will deviate greatly from that of the seismic waves, and even if an earthquake occurs and the seismic waves reach the Jijomu near Structure B, 9III! Object 11B only has a slight amount of seismic waves that can be applied manually. Also, returning from structure B [
The rice energy is also dissipated by asphalt 4 and water 7.

Therefore, this structure B can obtain a side layer function as well as a seismic isolation function.

This asphalt 4 is a horizontal seismic isolation device with a mechanical structure that has problems in durability and M roughness, that is, it has drawbacks such as corrosion, bacterial rot, or deterioration due to aging and high stress conditions. While solving problems with the equipment, it also serves to protect it.

Furthermore, as can be seen from Pascal's law, the isolated structure is a stress boundary except for the position of the horizontal seismic isolation device, so the problem of uneven settlement can be solved.

Here, the weak point of structure B having such a floating structure is that it is unstable against large lateral loads generated by typhoons and the like. Therefore, the amount of water 7 can be increased or decreased by a pump (not shown) to freely adjust the water surface height. The supporting load borne by ... will increase or decrease. By doing so,
For example, if structure B is subject to large wind loads due to typhoon conditions, pumps may be used to drain water and temporarily lower the water level to reduce the buoyancy of the water, thereby providing horizontal isolation. The support load borne by the seismic device is brought to nearly 100% of the vertical load of structure B.

Therefore, the structure B has increased stability and can sufficiently cope with large wind loads 1 and the like.

From the above, it is possible to structurally design the structure 71mB with very flexible design conditions against earthquakes, etc.
In addition to reducing construction costs, it is possible to improve the structure of high-rise buildings and improve layered properties.

In addition, in the above two rituals, we considered a case where the ground was relatively good. However, even if the ground is soft and the conditions are poor,
This problem can be solved by driving a pile directly under the horizontal destination S device. In this case, it is sufficient that the above-mentioned pile is designed so that it can carry a vertical load of 5 to 10 sKff as a long M load and a vertical load of 100 sKff as a short-term load.

Further, the viscous fluid material 4 and the fluid material 7 may be the same type of fluid material (in addition to the asphalt 4 and water 7, bentonite liquid, fluid oil, etc. may be used).

〔Effect of the invention〕

As described above, this invention interposes a horizontal seismic isolation device and a fluid material between the foundation and the building, and basically isolates the vertical load of the building from 05% to lθ% in the horizontal direction. To the seismic device,
90-95% of the burden is on the fluid material 111! (1) The disadvantages of mechanical seismic isolation devices, such as deterioration due to aging and high stress conditions, are eliminated, and most of them are not affected by earthquakes. It has a seismic isolation structure in which the ground expansion force is not applied manually.

(11) If it is a waste, the fluid material will act as a viscous flow damper, so it will be absorbed by the side layer.

+1111 fi The material used as the moving material does not change in quality even after many years, and also serves as a support for the horizontal seismic isolation device.

Qψ As can be seen from Pascal's law, except for the position of the horizontal seismic isolation device, there is no problem of uneven settlement because it is a stress boundary.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the present invention.69 Figure 1 shows a part of the entire structure of the invention, and Figures 2 to 4 show the embodiment. This is an explanatory diagram for explaining the construction procedure. M...ground, B...structure, l...foundation, 2.
...Horizontal seismic isolation device, 4...Viscosity 15twJ material, 5
...Wall, 7...Fluid material.

Claims (4)

[Claims] (1) A seismic isolation device that installs a foundation in the ground, installs a structure above the foundation so that a space is formed in between, and supports the structure from the foundation within the space. A floating seismic isolation structure characterized by having a fluid material interposed therein. (2) The floating seismic isolation structure according to claim 1, wherein the fluid material is asphalt, water, bentonite liquid, or oil. (3) The floating seismic isolation structure according to claim 1, wherein the lower part of the structure and the ground on the sides of the lower part of the structure form a space. (4) A floating seismic isolation structure according to claim (3), characterized in that the space formed by the lower part of the structure and the ground on the sides of the lower part of the structure is filled with water or bentonite liquid. .