JP2010019007A - Base-isolating base plate of building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that an inexpensive, easy-to-construct and maintenance-free base-isolation means is required to be adopted for foundation structures of a large number of existing general low-rise and medium-rise buildings, because any one of a laminated rubber bearing, a damper bearing, a base-isolating mat, etc., which are conventionally adopted as means for base-isolating the foundation structure of the building, requires high costs and a high degree of technology for construction. <P>SOLUTION: A lower base plate D is installed on foundation work I such as broken stones in such a manner that a hemispherical sliding surface E and an undersurface B of an upper base plate are brought into contact with each other, and foundation concrete H is installed on the upper base plate A. Subsequently, backfill surface compaction is performed by mean of a backfilling elastic material J, so that propagation of earthquake energy can be reduced. During bigger earthquakes, each of the foundation concrete H and the upper base plate A can freely slide in a horizontal direction, and the upper and lower base plates A and D can freely slide in the horizontal direction on a surface of contact with a semispherical sliding surface F, so as to reduce the propagation of the earthquake energy to the building to protect a person's life and property from earthquake damages by exerting a base-isolation effect. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seismic isolation board for a building.

2. Description of the Related Art Conventionally, as a technique for obtaining a seismic isolation effect installed on a foundation or support part of a building, a technique using laminated rubber or a damper or a technique using a seismic isolation mat as a seismic isolator is known.
JP 2002-340088 JP 2001-207682 A

  Many conventional seismic isolation devices are suitable for medium- and high-rise large-scale buildings, and are complicated and expensive to construct, and are not suitable for low-rise structures.

  Conventionally, the materials to be backfilled after the foundation work is completed, such as soil generated on the ground or gravel, crushed stone, sand, etc., and the seismic energy transmitted to the building by recycling waste plastic and other waste as backfill material There has been a demand for a material that can be absorbed by an elastic material.

  In the present invention, as a means for solving the above-mentioned problems, a lower substrate having a semicircular spherical smooth surface is installed on a basic ground industry such as cracked stone, and an upper substrate having a smooth finish on all surfaces is provided thereon. After installation, foundation concrete is cast on it, and the foundation concrete formwork is removed, and then waste such as waste plastic is backfilled with recycled elastic material.

  It is desirable that both the upper substrate and the lower substrate are made by recycling waste such as waste plastic.

As described above, the seismic isolation substrate and the backfill elastic material of the building according to the present invention can be provided at low cost by recycling waste such as waste plastic and effectively using it as a resource. It is possible to reduce the damage suffered by people and protect the lives of the people.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A is an upper substrate having all surfaces finished smoothly, and is installed between the lower substrate D and the foundation concrete H. Foundation concrete H is installed on the upper surface C of the upper substrate. Further, the lower surface C of the upper substrate is slidably in contact with a semispherical smooth surface E provided with a semispherical protrusion F.

  The lower substrate D is installed on the ground industry I, and the semispherical smooth surface E is slidably in contact with the lower surface B of the upper substrate.

  As a process of installing a base isolation board for a building, first excavate the ground K from the ground surface to the bottom of Geotechnical I. Next, after installing Ground Industry I using cracked stone, etc., lower board D is installed, and then upper board A is installed. Next, a foundation concrete formwork is attached to the upper surface C of the upper substrate, and concrete is placed. After the curing period of the foundation concrete has passed, the foundation concrete formwork is removed and backfilled to a predetermined depth, and the elastic material J is backfilled and rolled.

  When an earthquake occurs and the seismic energy propagates to the supporting ground K of the building, the backfill elastic material J is installed between the ground K and the building, so that the propagation of the seismic energy to the building is reduced.

  When the seismic energy is large, the upper substrate A and the lower substrate D are slidably in contact with the semi-spherical smooth surface E, and the upper substrate A and the lower substrate D are slid horizontally in different periods. Demonstrate the seismic effect.

The foundation concrete H is installed on the upper surface C of the upper substrate that has been finished smoothly.
When seismic energy is transmitted through the ground K, the foundation concrete H supporting the building body is slidable with the upper surface C of the upper substrate together with the building body and exhibits a seismic isolation effect.

  Since the foundation concrete H, the upper substrate A, and the lower substrate D are all in contact with the backfill elastic material J, the seismic isolation effect is not reduced even if each slides in the horizontal direction.

  Since the moisture contained in the ground always stays in the semicircular spherical smooth concave portion G, it becomes easy to slide.

  The upper substrate A, the lower substrate D, and the backfill elastic material J contribute to the formation of a resource recycling society by using recycled materials such as waste plastic.

  The substrate and backfill material obtained by recycling the waste have a heat insulating effect, and it is possible to avoid freezing of the surrounding ground particularly in a snowy cold region.

Schematic sectional view showing an embodiment of the present invention Upper substrate A Lower substrate D

Explanation of symbols

A Upper substrate B Lower surface of upper substrate
C Top surface of upper substrate
D Bottom board
E Semicircular spherical smooth surface
F Semi-spherical protrusion
G Semicircular spherical smooth recess
H foundation concrete
I local business
J Backfill elastic material
K ground

Claims (1)

  In a base-isolated base structure of a building, an upper substrate that is installed between the supporting ground or the foundation ground industry and the foundation concrete and has a smooth surface that supports the entire building including the foundation concrete, and a lower surface of the upper substrate Is formed of a lower substrate with a plurality of upwardly facing semispherical protrusions exposed, and the semispherical smooth surface provided on the lower substrate is slidably in contact with the lower surface of the upper substrate. As a result, when seismic force is propagated to the ground, the contact surface between the upper and lower boards slides, and the seismic isolation board is made of an elastic material as the backfill material after the foundation work is completed.