JPH0960009A - Base isolation foundation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a small building from destruction due to earthquakes. SOLUTION: A four-point-supported, elastic projecting flat spring A, which has diagonal plates 3 extended in cruciform and diagonally downward from a top board 2 and which has tripod plates 4 connected to the diagonal plates 3 in such a way as to be parallel to the top board 2, or a two-point-supported, elastic projecting flat spring, has its top board 2 secured to the required part of the lower surface 5 of a beam member C by a bolt 7. A base member D is continuously laid in a continuous groove 8, shielding plates 10 are placed upright on both the right and left of the outside of the beam member C, and soil 9 is packed outside the shielding plates 10.

Description

Detailed Description of the Invention

[0001]

[Technical field to which the invention pertains] Seismic isolation foundation for small buildings.

[0002]

2. Description of the Related Art There is no conventional technique to compare with.

[0003]

In order to protect small buildings such as houses from earthquake damage, it is necessary to reduce the influence of seismic force on superstructures in the foundation structure.

[0004]

A cloth foundation is separated into a foundation member and a beam member to absorb seismic force between the foundation member and the beam member.

A leg plate is cruciform licked in the width direction and the foundation direction of the foundation plate member. Four-point support extending downwards or two-point support elastic mountain flat spring bodies extending downwards only in the foundation direction are provided on the lower surface of the beam member. Bolted in place

A beam member to which an elastic chevron flat spring body is fixed is laid on the through groove on the upper surface of the foundation plate member.

The lower end of the shielding plate that prevents the intrusion of earth and sand between the foundation plate member and the beam member is inserted into the through groove, and it is erected on both left and right sides of the beam member.

[0008] Earth and sand are buried on both left and right sides of the beam member to stabilize the shield plate.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION When a seismic force acts, the seismic force fluctuation is absorbed by the elastic force of a 4-point supporting elastic chevron flat spring body or a 2-point supporting elastic chevron flat spring body. Do not communicate to.

[0010]

An embodiment will be described with reference to the drawings. Four
The point-supporting elastic chevron flat spring body (A) has a bolt hole (1) in the center.
The swash plate (3) is connected to the sloping plate (2) from the rectangular top plate (2) having the above, and the leg plate (4) parallel to the top plate (2) is connected to the swash plate (3) in a cross shape. (Fig. 1)

Further, as shown in FIG. 2, a swash plate (3) is licked at both ends of a rectangular top plate (2) having a bolt hole (1) and connected downward to the outside, and further leg plates are attached to the left and right swash plates (3). A two-point supporting elastic chevron flat spring body (B) in which (4) is connected in parallel with the top plate (2) can be used.

The elastic chevron flat spring bodies (A) and (B) are manufactured from a single flat metal plate by pressing, using steel plates, stainless steel, and other metals as materials.

Further, the seismic force must be absorbed appropriately under the influence of the elastic force of the bent portion and the load of the upper structure (including horizontal force) and seismic force.

In consideration of this, an elastic chevron flat spring body (A)
The thickness and width of (B) and the size of the bending radius of the bent portion must be designed.

The elastic chevron flat spring bodies (A) and (B) are attached to insert nuts (6) (per anchor rebar) embedded in the lower surface (5) of the beam member (C) at predetermined intervals.

When the bolt hole (1) is aligned and the elastic chevron flat spring bodies (A) and (B) are used, the leg plate (4) direction is aligned with the length direction of the beam member (C) and the bolt hole (1) is aligned. Screw the fixing bolt (7).

The beam member (C) to which the elastic chevron flat spring bodies (A) and (B) are fixed is connected on the foundation plate member (D) installed in the foundation direction on the ground having a sufficient earth bearing strength. The content of the structure can be freely chosen.)

In order to lay a beam member (C) on which the elastic chevron flat spring bodies (A) and (B) are fixed on the foundation plate member (D),
The leg plates (4) of the elastic chevron flat spring bodies (A) and (B) are aligned and sequentially laid in the direction of the through groove (8) on the upper surface of the foundation plate member (D).

Next, between the surface of the foundation plate member (D) and the beam member (C), a shielding plate made of a material such as a cement plate which does not decay and prevents intrusion of earth and sand (4) which impedes elastic force is provided. (10)
Through the lower end of the beam (8) and the left and right side surfaces (1) of the beam member (C).
Insert along 1) and fill the outside of the shield plate (10) with earth and sand (9) to stabilize the shield plate (10).

Even if the upper structure is shaken by an earthquake, the shield plate (1
0) is not fixed to the side surface (11) of the slag member (C), so that it can freely slide up and down.

Even if the upper structure sways up and down due to the seismic force, the stress is transmitted from the top plate (2) to the swash plate (3) and the leg plate (4).

In particular, the leg plate (4) is shifted outward by the through groove (8) of the foundation plate member (D) to absorb the seismic force, and if released from the seismic force, the elastic chevron flat spring bodies (A) (B) are used. ) Is restored by the elastic force.

Further, the 4-point supporting elastic chevron flat spring body (A) has an advantage that it can deal with the seismic force from any of the cross directions.

[0024]

Since the present invention is configured as described above, it has the following effects.

Even if the foundation superstructure swings up and down or left and right due to the seismic force, it is possible that the space between the foundation plate member (D) and the beam member (C) is
The point or two-point supporting elastic chevron flat spring bodies (A) and (B) are provided, and by these elasticity, seismic force is absorbed and the upper structure is protected from earthquake damage.

[Brief description of drawings]

FIG. 1 is a perspective view of a 4-point supporting elastic chevron flat spring body.

FIG. 2 is a perspective view of a two-point supporting elastic chevron flat spring body.

FIG. 3 is a vertical cross-sectional view of an essential part showing a state in which a 4-point supporting elastic chevron flat spring body is fixed to the lower surface of a beam member and installed in a foundation plate member through groove.

FIG. 4 is a cross-sectional view in FIG. 3a-a showing a state in which a four-point supporting elastic chevron flat spring body is fixed to the lower surface of the beam member and is installed in the foundation plate member through groove.

FIG. 5 is a plan view showing the relationship between a 4-point supporting elastic chevron flat spring body and a through groove.

FIG. 6 is a plan view showing a relationship between a two-point supporting elastic chevron flat spring body and a through groove.

[Explanation of symbols]

 1 bolt hole 2 top plate 3 swash plate 4 leg plate 5 lower surface 6 insert nut 7 fixing bolt 8 through groove 9 earth and sand 10 shield plate 11 side surface A 4 point supporting elastic mountain flat spring body B 2 point supporting elastic mountain spring flat body C beam member D foundation member

Claims (2)

[Claims] 1. A swash plate (3) is licked from the top plate (2) in a cross shape and extends downward, and a leg plate (4) is connected to the swash plate (3) in parallel with the top plate (2). The top plate (2) of the four-point-supporting elastic chevron flat spring body (A) is fixed to the beam member (C) and the lower surface (5) by bolts (7), and is attached to the foundation plate member (D) through groove (8). The beam member (C) is continuously laid, and the left and right side faces (1
The seismic isolation foundation is characterized in that 1) the lower end of the shield plate (10) is inserted into the groove (8) and the earth (sand) (9) is buried outside the rising shield plate (10). 2. A swash plate (3) is licked and extended downward from the top plate (2), and a leg plate (4) is connected to the slope (3) in parallel with the top plate (2) in the base direction. The seismic isolation base according to claim 1, wherein the top plate (2) of the point-supporting elastic flat spring body (B) is fixed to the lower surface (5) of the beam member (C) by bolts (7).