JP3333163B2 - Seismic isolation structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation structure.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional seismic isolation structure is constructed by alternately stacking steel plates 20 and rubber plates 21 while a base structure 18 and an upper structure 19 are separated. The seismic isolation isolators 22 and the dampers 23 are deformed in the event of an earthquake so that shaking caused by the earthquake is not transmitted to the upper structure 19.

[0003]

However, the seismic isolation structure as described above can attenuate the horizontal load acting on the building due to the so-called marine earthquake (hereinafter referred to as the horizontal load due to the earthquake). There is a problem that not only a vertical load due to a direct earthquake (hereinafter, referred to as a vertical load due to an earthquake) cannot be attenuated, but also the upper structure is separated from the foundation structure due to the vertical load.

[0004] The present invention has been made in view of the above problems, and an object of the present invention is to provide a seismic isolation structure in which a superstructure does not separate from a foundation structure even when subjected to a large vertical load due to an earthquake. is there.

[0005]

The gist of the seismic isolation structure for solving the above problems is that a seismic isolation device is installed between the base structure and the marginal upper structure, and the base structure and the upper structure are separated from each other. PC inclined in a predetermined direction across the structure
A steel material is provided, and the PC steel material has a basic structure at one end.
And the other end is connected to the pillar
Blow plate provided over the end of a beam and the end of the other beam
It is characterized by being fixed to . Also, the seismic isolation device includes a seismic isolation isolator . Also including the PC steel material is either PC strand wire, PC steel rod, the PC steel wire
No.

Based on superstructure by vertical load caused by earthquake
PC steel resists the forces trying to separate it from the structure.
The horizontal load due to the earthquake or the vertical load due to the earthquake is P
Attenuate with C steel and seismic isolation device. Also horizontal due to earthquake
The load is attenuated by the seismic isolation isolators and PC steel, and the upper
To reduce horizontal shaking of the structure. Also the size of the building,
PC steel strand, PC steel rod, PC steel wire according to shape and height
Select one of

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the seismic isolation structure of the present invention will be described below in detail with reference to the drawings. The above seismic isolation structure has the first and second embodiments. FIGS. 1 and 2 show the seismic isolation structure of the first embodiment, and FIG. 3 shows the seismic isolation structure of the second embodiment, respectively. In the seismic isolation structures of the following embodiments, the same components will be described using the same reference numerals, and different configurations will be described using different reference numerals.

The seismic isolation structure 1 of the first embodiment is shown in FIG.
As shown in the figure, while the base structure 2 and the upper structure 3 are cut off, the seismic isolation device 4 as a seismic isolation device is installed, and the PC steel material 5 is installed over the base structure 2 and the upper structure 3. It is configured. The foundation structure 2 is composed of a footing 7 constructed on the head of a pile 6 cast on the ground and a foundation beam 8 bridged between these footings 7. Superstructure 3
The installation space 10 is formed. On the other hand, superstructure 3
The prestressed precast concrete beams 12 (hereinafter, referred to as PC beams) are erected between the prestressed precast concrete columns 11 (hereinafter, referred to as PC columns).
3 are constructed and configured. Also, the end of one PC beam 12 joined to the PC column 11 and the other PC beam 12
And a slab 13 is integrally formed with a fired plate 14. Vertical striations and horizontal striations (not shown) are arranged on the fire plate 14 to reinforce the ends of the PC beams 12 and also reinforce the corners of the slab 13 on which a large shear force acts. .

The seismic isolation isolator 4 is composed of a steel plate 15 and a rubber plate 1.
6 are alternately stacked, and the upper surface of the footing 7 and P
It is installed between the lower surface of the C pillar 11. On the other hand, the PC steel material 5 is composed of a plurality of PC steel wires bundled together and covered with a rust-preventive sheath (not shown).
It is buried inside and the upper end is buried in the fire plate 14, and is inclined toward the center of the floor as a whole. As described above, since the upper end of the PC steel material 5 is buried in the fire plate 14, the vertical load caused by the earthquake acting on the upper structure 3 can be suppressed without damaging the end of each PC beam 12 and the slab 13. it can. Further, since the PC steel material 5 is installed at the position where the seismic isolation isolators 4 are located, the upper structure can be supported in a well-balanced manner against a vertical load due to the earthquake. The upper end of the PC steel 5 is inclined toward the center of the floor,
In addition, since the base structure 2 and the upper structure 3 swing in different directions due to a horizontal load due to the earthquake, they can follow the horizontal load due to some expansion and contraction. Further, the PC steel 5 is the PC column 1
Since it is installed at one corner, that is, at a location located in one diagonal direction, it can easily follow a horizontal load in the direction of the arrow due to the earthquake. The PC steel material 5 is not limited to the above-described PC stranded wire, but may be a PC steel wire or a bundle of a plurality of them, or a PC steel rod, and may have a shape, size, height, etc. Select according to.

FIG. 3 shows a seismic isolation structure 17 according to a second embodiment.
The PC steel material 5 is installed at two corners of the PC column 11. Thus, the PC steel material 5 is provided at the two corners of the PC column 11, that is, at all the corners formed by the PC beam 12.
By setting up, it is possible to further enhance the resistance to the vertical load due to the earthquake and the good balance to the superstructure. Further, the seismic isolation structure 1 of the present embodiment,
Reference numeral 17 denotes a configuration in which the PC beam 12 is joined to the PC column 11 in a T-shape. In the case of a seismic isolation structure in which the PC beam 12 is joined to the PC column 11 in a cross shape, the PC steel member 5 is connected to the PC column. 11 may be provided at all corners.

[0011]

According to the present invention, since the base structure and the upper structure are joined by the PC steel material, it is possible to prevent the upper structure from being separated from the base structure due to a vertical load caused by an earthquake.

The horizontal load due to the earthquake is attenuated by the seismic isolation isolator to reduce the horizontal vibration of the superstructure.

One of a PC steel strand, a PC steel rod and a PC steel wire can be selected according to the size, shape and height of the building.

A horizontal load due to an earthquake or a vertical load due to an earthquake can be attenuated by the PC steel and the seismic isolation device, and can be resisted by these loads.

[Brief description of the drawings]

FIG. 1 is a sectional view of a lower portion of a seismic isolation structure.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a horizontal sectional view of another embodiment of the seismic isolation structure.

FIG. 4 is a sectional view of a conventional seismic isolation structure.

[Explanation of symbols]

 1, 17 Seismic isolation structure 2, 18 Foundation structure 3, 19 Superstructure 4, 22 Isolation isolator 5 PC steel 6 Pile 7 Footing 8 Foundation beam 9 Underground outer wall 10 Installation space 11 PC column 12 PC beam 13 Slab 14 15, 20 Steel plate 16, 21 Rubber plate 23 Damper

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 27/34 E04H 9/02 331

Claims (3)

(57) [Claims] 1. A seismic isolation device is installed between a base structure and a trimmed upper structure, and a PC steel material inclined in a predetermined direction is provided between the base structure and the upper structure .
The PC steel material has one end fixed to the footing of the basic structure.
And the other end is connected to the end of one beam
A seismic isolation structure characterized by being fixed to a battering plate provided over an end of one of the beams . 2. The seismic isolation structure according to claim 1, wherein the seismic isolation device is a seismic isolation isolator. 3. The PC steel material is a PC steel strand, a PC steel rod, P
The seismic isolation structure according to claim 1, wherein the seismic isolation structure is any one of a C steel wire.