JP2802759B2 - Structure support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention is applied to construct various structures such as office buildings, factories, dangerous goods warehouses, and residential buildings. The present invention relates to a support structure for a structure suitable for use as a seismic isolation structure that absorbs vibrations.

"Conventional technology" Recent office buildings contain important information-related facilities such as computers, so if a major earthquake destroys those facilities, the damage caused by them will be enormous. It is considered to be.

Therefore, in recent years, seismic isolation devices have been used to extend the natural period of buildings in order to not only prevent the collapse of buildings during an earthquake, but also protect important facilities and valuable assets housed in the buildings from earthquakes. In addition to reducing the seismic force used in buildings, it also ensures the safety of buildings by absorbing vibration energy.

As the seismic isolation device, a laminated rubber obtained by laminating a rubber sheet and an iron plate in a sandwich shape is mainly used, and a damper for absorbing vibration energy is generally used in combination therewith. In this type of seismic isolation device, a plurality of the above-mentioned laminated rubber is installed on the ground to support a building on it, thereby lengthening the period of the entire building and suppressing the response acceleration of the building during an earthquake. The seismic force acting on the building is reduced by absorbing the vibration energy applied to the building with a damper or the like.

However, for example, when a building is constructed on soft ground, it is considered that the ground will sink unevenly during the ground, and in such a case, the building on the ground Even if the combined seismic force is reduced by the seismic isolation device, it is possible that the ground itself will sink unevenly and the structure will tilt.

The present invention has been made in view of the above circumstances, and does not make a building or its foundation a base-isolated structure, but a structure in which an underground skeleton of a building is covered with a low-vibration body made of only elastic members. The purpose of this is to reduce the seismic force by absorbing the vibration with the low vibration body around the underground skeleton.

"Means for Solving the Problems" The support structure of the structural part of the present invention is a support structure of a structure having a seismic isolation structure that absorbs a vibration during an earthquake, and the structure is made of only elastic members. It is configured to be supported by a low vibration body, the low vibration body is formed so as to directly cover the entire underground skeleton portion of the structure,
It is characterized by being buried in the surrounding ground.

"Action" In this action, a low-vibration body that directly covers the entire underground skeleton of the structure is provided in the ground, and this low-vibration body is made up of only elastic members. By the support, during an earthquake, the seismic motion is absorbed by the low-vibration body around the underground skeleton of the structure, thereby reducing the seismic force acting on the structure.

An embodiment of the present invention will be described below with reference to FIG.

In this embodiment, a building (structure) 2 built on the ground 1 is supported on a low-vibration body. The low-vibration body is composed of only flat elastic members 3 and 4 having a predetermined thickness and arranged in close contact with the side and bottom of the underground skeleton of the building 2. The whole underground skeleton of the building 2 is covered with the elastic member 3,
Reference numeral 4 denotes a configuration buried in the ground 1 around the building 2.

The elastic members 3 and 4 are formed by molding an elastic material such as natural rubber or synthetic rubber into a flat plate so as to be able to adhere to the side wall or the bottom of the building 2, and the thickness thereof is expected. The thickness is set to be sufficient to absorb the ground motion even with the largest seismic force.

As the elastic material, natural rubber, or synthetic rubber such as chloroprene rubber, butadiene / styrene rubber, butyl rubber, nitrile rubber, urethane rubber, silicone rubber, fluorine rubber, stereo rubber, etc. are used. When used, the degree of vulcanization (mainly for natural rubber), the compounding ratio of monomers (for synthetic rubber), etc. are set appropriately to achieve high vibration absorption for the natural period of the seismic motion to be absorbed. It is desirable to adjust to have.

In addition, the elastic members 3 and 4 are not always made of one kind of elastic material, and several kinds of elastic members made of materials having different rigidities and damping properties are laminated, so that each elastic member is Vibrations of different frequencies can be absorbed, thereby absorbing vibrations of a wide range of frequencies.
For example, as shown in FIG. 1, the elastic members 4 arranged at the bottom of the building 2 are elastic members 4a, 4a having different rigidities and damping properties.
In the case of a laminated body of b, 4c, 4d, each elastic member 4a, 4
b, 4c, 4d by changing the material or each elastic member 4a, 4
By appropriately adjusting the degree of vulcanization in b, 4c, 4d (mainly in the case of natural rubber), the compounding ratio of the monomer (in the case of synthetic rubber), etc., the vibration absorption of each elastic member 4a, 4b, 4c, 4d The characteristics are changed so that the elastic members 4a, 4b, 4c, 4d absorb vibrations of different frequencies.

When the building 2 is thus supported by the low vibration body composed of only the elastic members 3 and 4, the elastic members 3 and 4 are arranged on the side and the bottom of the underground skeleton of the building 2. Therefore, the horizontal and vertical components of the seismic motion applied to the ground during an earthquake can be absorbed by the elastic members 3 and 4, whereby the seismic motion can be absorbed by the elastic members 3 and 4 around the underground skeleton of the building 2. And the seismic force acting on the building 2 can be reduced, and the elastic members 4 disposed at the bottom of the building 2 are provided with a plurality of elastic members 4a, 4b, 4c, 4d having different vibration absorption characteristics. , The elastic members 4a, 4b, 4c, and 4d can absorb vibrations of different frequencies. For this reason, according to such a support structure of the building 2, horizontal vibration and vertical vibration can be reliably absorbed by the low vibration body composed only of the elastic members 3 and 4, and a wide frequency range can be obtained. Can be absorbed at the same time, whereby the seismic force acting on the building 2 can be reduced very effectively.

According to the present invention, a low-vibration body that directly covers the entire underground skeleton of a structure is provided in the ground, and the low-vibration body is formed of only an elastic member. By supporting the structure, during an earthquake, seismic motion can be absorbed by the low-vibration body around the underground skeleton of the structure, thereby reducing the seismic force acting on the structure. The ground around the underground skeleton of the object was replaced with an elastic member, so even if vertical vibrations were applied to the ground, the restoring force of the elastic member prevented uneven settlement and reduced the safety of the structure. It can be ensured reliably.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of the present invention, and is a schematic configuration diagram of a low-vibration body and a building constructed thereon. 1 ... ground, 2 ... structure (building), 3, 4 ... elastic member.

Claims (1)

(57) [Claims] 1. A support structure for a structure having a seismic isolation structure that absorbs vibration during an earthquake, wherein the structure is supported by a low-vibration body consisting only of an elastic member. The structure for supporting a structure, wherein the low-vibration body is formed so as to directly cover the entire underground skeleton portion of the structure, and is buried in the surrounding ground.