Static structures (e.g. – buildings) – Means compensating earth-transmitted force
Reexamination Certificate
1999-11-15
2001-11-20
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Reexamination Certificate
active
06318031
ABSTRACT:
BACKGROUND OF THE INVENTION AND DESCRIPTION OF THE RELATED ART
The present invention relates to a base structure of a building, capable of improving earthquake-resistant and vibration-proof of the building against earthquake, traffic vibration, etc. and effectively preventing subsidence of ground, and to a construction method thereof.
Vibration due to earthquake, vibration accompanied by passing of large-sized vehicles such as buses and trucks, that is, traffic vibration, or vibration of mechanical operation of machines in works exerts adverse effect on the base of a building, and at the worst case, it causes dip-slip or collapse of the building, or ground subsidence.
Conventionally, to improve earthquake-resistant and vibration-proof of a building against earthquake and vibration due to traffic, etc. and to prevent ground subsidence, there has been adopted a means of increasing the amounts of concrete and reinforcements for constructing the base of a building, a means for supporting the base of the building with piles, or a means of reinforcing soft ground by using a cement based ground improvement material.
The improvement of earthquake-resistant and vibration-proof and the prevention of ground subsidence by the above-described means, however, is not only economically disadvantageous in that a large number of materials must be used to thereby raise the construction cost, but also insufficient to realize the above-described purpose even if a large number of materials are used.
Japanese Patent Laid-open Nos. Hei 9-165758, Hei 9-273160 and Hei 11-256596 have disclosed a base structure of a building, in which a base support formed by a synthetic resin molded foam is laid under the base of the building. Such a base structure is very effective to improve earthquake-resistant and vibration-proof and to prevent ground subsidence.
Since, large earthquake disasters have occurred in recent years, as a starting point of examination, the conventional safety standard has been required to be reviewed, and to meet such a requirement, it is expected to develop a stronger earthquake-resistant base structure of a building.
OBJECT AND SUMMARY OF THE INVENTION
An object of the present invention is to provide a base structure of a building, capable of efficiently absorbing vibration waves of earthquake and traffic vibration, and vibration waves occurring along with mechanical operation of machines in works, thereby significantly improving earthquake-resistant and vibration-proof of the building.
Another object of the present invention is to provide a base structure of a building, capable of improving earthquake-resistant and vibration-proof and effectively preventing ground subsidence.
A further object of the present invention is to provide a method of constructing a base structure of a building capable of improving earthquake-resistant and vibration-proof and preventing ground subsidence.
The base structure of a building according to the present invention includes a base support laid at a location where the building is to be constructed, a base formed on the base support, and vibration absorbers interposed between the base support and the base. The base support is formed by a plate-like synthetic resin molded foam, and is laid under the ground surface. The synthetic resin molded foam may be preferably made from a material which is selected from polystyrene, polypropylene, and polyethylene, and which has a compressive strength ranging from 3 to 25 t/m
2
. The base support may be formed not only by the resin foam plate but also by resin foam concrete as a mixture of synthetic resin foamed particles and concrete.
The base is the concrete structure formed by placing concrete on the base support.
Each of the vibration absorbers interposed between the base support and the base has a porous structure having a large number of cavities. As such a porous structure, a synthetic resin foam can be most preferably used. The synthetic resin foam may be preferably made from a material selected from polystyrene, polypropylene, and polyethylene and may preferably have a porosity ranging from 15 to 40%.
A plurality of the vibration absorbers may be provided between the base support and the base in such a manner as to be spaced at specific intervals on the base support.
The base structure of the present invention is constructed by the steps of excavating ground and removing soil to form a recess, laying the base support formed by a synthetic resin molded foam in the recess or placing resin foam concrete in the recess to provide the base support formed by the resin foam concrete in the recess, mounting a plurality of the vibration absorbers on the base support in such a manner that the vibration absorbers are spaced at specific intervals, and placing concrete on the base support, to form the base of a building on the base support.
The base structure of the present invention is composed of the base support formed by a synthetic resin molded foam or resin foam concrete, the base formed by concrete formed on the base support, and vibration absorbers, each having a large number of cavities, interposed between the base support and the base. As a result, when there occur vibration waves of earthquake and traffic vibration and vibration waves accompanied by mechanical operation of machines in works, the energy of the vibration waves is damped as the vibration waves propagate through the base support and the vibration absorbers, and also the vibration waves transmitting from the vibration absorbers to the base are reflected from the boundary plane between the concrete plane of the base and the vibration absorbers. In this way, according to the present invention, it is possible to efficiently damp the energy of vibration waves and hence to significantly improve the earthquake-resistant, earthquake-proof, and vibration-proof of the building.
The base structure of the present invention is advantageous in reducing the cost of the materials used, simplifying the construction work and shortening the construction period, and reducing the construction cost.
REFERENCES:
patent: 4593502 (1986-06-01), Buckle
patent: 5016413 (1991-05-01), Counihan
patent: 297 09 300 (1998-02-01), None
patent: 2 120 167 (1983-11-01), None
patent: 9-165758 (1997-06-01), None
patent: 9273160 (1997-10-01), None
Kobayashi Toshi-aki
Nakamura Takuzo
Friedman Carl D.
Kanesaka & Takeuchi
Nakamura Bussan Co., Ltd.
Varner Steve
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