JP2979288B2 - 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 that absorbs vibrations such as earthquakes and reduces vibrations applied to structures such as buildings.

[0002]

2. Description of the Related Art Isolators used for seismic isolation structures are basically constructed by alternately laminating and fixing rubber plates and steel plates, and generally receive a large weight and smoothly absorb vibrations. In consideration of the above, the rigidity in the vertical direction / stiffness in the lateral (shear) direction is set to be large (for example, 500/1). Conventionally, as shown in FIG. 3, the isolator is disposed between a support member 10 provided at a lower portion of the structure 1 and the vibration generating side portion 2 in such a manner that the axis of the isolator coincides with the vertical direction. I was In FIG. 3, reference symbol G indicates a center of gravity, and reference symbol L1 indicates a distance from the center of the isolator 3 to the center of gravity G.

However, in the case of the above, when horizontal vibration occurs and the vibration generating side part 2 moves from the right side to the left side, a falling moment M = L1 × F is generated in the structure 1, and the left isolator 3 is generated. , A tensile force acts on the right isolator 3, and a compressive force acts on the right isolator 3. Therefore, the life of the left isolator 3 on which the tensile force acts is significantly reduced, and the structure 1 is inclined (see FIGS. 3 and 4). ). In particular, when the structure 1 has a narrow frontage, a high height and a low rigidity as in an automatic warehouse, the structure 1 itself is greatly deformed as shown in FIG.
In the upper part, a situation where the inclination was very large and the cargo collapsed occurred.

[0004]

Therefore, according to the present invention, even when the structure has a narrow frontage, a high height and a low rigidity, the inclination of the structure does not become so large, and the life of the isolator is hardly shortened. The task is to provide a seismic isolation structure.

[0005]

The seismic isolation structure of the present invention is as follows.
In a seismic isolation structure in which a support member 10 provided on a tall and low-rigid structure 1 is attached to a vibration generating side 2 via an isolator 3, an upper and lower receiving portion 40 attached to the vibration generating side 2 A plurality of fixtures 4 having a plurality of fixing members 41 and upper and lower isolators 3 and 3 arranged between the upper and lower receiving portions 40 and 41 of the respective fixing tools 4 are provided. Is pinched.

Therefore, when a horizontal vibration is generated on the vibration generating side portion 2, the supporting member 10 is connected to the upper and lower isolators 3,
3 is compressed, and the supporting member 10
Even if a pulling force acts on the isolators 3,3, there is no case where a tensile force acts directly on the isolators 3,3. This reduces the amount of tilt of the support member 10 and prevents the life of the isolator from being shortened.

It is preferable that the isolators 3 and 3 are inclined so that the extension lines of the axes of the isolators 3 and 3 are gathered on a vertical line passing through the center of gravity of the structure 1. In this case, the moment for tipping over the structure 1 can be reduced, and the amount of tilt of the support member 10 can be further reduced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

This seismic isolation structure is formed using a plurality of isolators, and has a narrow frontage like an automatic warehouse.
It is used for tall and low-rigid structures. [About the basic structure of the seismic isolation structure] As shown in FIG. Part 4
It has a plurality of fixtures 4 having 0, 41 and upper and lower isolators 3, 3 arranged between the upper and lower receiving portions 40, 41 of each fixture 4. In addition to holding the support member 10, the isolators 3 and 3 are arranged at an angle so that the extension of the axis of the isolators 3 and 3 is gathered on a vertical line passing through the center of gravity of the structure 1. In addition, as shown in FIG.
Is omitted in the linear body. In FIG. 1, reference numeral G denotes the center of gravity of the structure 1, reference numeral CC 1 denotes a compliance center of the entire system (compliance center considering elasticity of the isolator 3 and elasticity of the structure 1), and reference numeral CC 2 denotes a compliance center of the laminated rubber. . [Regarding Configuration of Isolator 3 ] As shown in FIG. 1, the isolator 3 is basically formed by vulcanization bonding or fixing in such a manner that a rubber plate 30 and a steel plate 31 are alternately laminated. The rigidity in the longitudinal direction / rigidity in the transverse (shear) direction is set to be large (for example, 500/1) in consideration of receiving weight and smoothly absorbing vibration. [Regarding the Structure of the Supporting Member 10 ] The supporting member 10 is disposed below the structure 1 as described above, and as shown in FIG. There is. The holding section 11 is bent upward toward the outside, and the bending angle thereof corresponds to the inclination of the isolators 3 and 3 described above. [Configuration of Fixing Tool 4 ] The fixing tool 4 is made of a steel material having a U-shaped cross section as shown in FIG. .

Here, the above-mentioned upper isolator 3 is fixed to the upper receiving portion 40 and the supporting member 10, and the lower isolator 3 is fixed to the lower receiving portion 41 and the supporting member 10, respectively. Has an initial compression force applied. [Regarding the function of this seismic isolation structure] As shown in FIG. 2, when horizontal vibration occurs and the ground side 2 'moves from right to left, the support member 10 is inclined upward to the right. The structure 1 is curved so that a moment acts around the center of compliance by the isolator 3 so that the lower end of the structure 1 is on the right side and the upper end is on the right side, and cancels out the inclination of the structure 1 to each other. Becomes

Further, even when the position of the center of gravity G changes depending on the load position as in an automatic warehouse, the distance between the compliance center CC1 and the center of gravity G of the entire system and the rigidity around the compliance center CC1 make the support member 10 difficult to handle. The inclination can be limited to a certain level or less.

Therefore, even if the structure 1 has a narrow frontage, a high height and a low rigidity, the inclination of the structure 1 is not so large and the life of the isolator 3 is hardly shortened. It can be.

[0013]

Since the present invention has the above-described configuration, it has the following effects.

According to the working portion described in the section of the means for solving the problems, even when the structure has a narrow frontage, a high height and a low rigidity, the inclination of the structure is not so large, and the isolator of the isolator is not so large. It is clear that it is possible to provide a seismic isolation structure that is unlikely to cause a reduction in service life.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a seismic isolation structure of the present invention.

FIG. 2 is a diagram illustrating a state of a structure when a ground side moves from right to left due to horizontal vibration.

FIG. 3 is a conceptual diagram showing a conventional seismic isolation structure.

FIG. 4 is a diagram showing a state of a high-rigidity structure when a vibration in a horizontal direction is generated and a vibration generation side moves from right to left.

FIG. 5 is a diagram illustrating a state of a low-rigidity structure in a case where a vibration in a horizontal direction is generated and a vibration generation side moves from right to left.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Structure 2 Vibration generation side part 3 Isolator 4 Fixture 10 Support member 40 Upper receiving part 41 Lower receiving part

Claims (3)

(57) [Claims] A seismic isolation structure in which a supporting member (10) provided on a tall and low-rigid structure (1) is attached to a vibration generating side (2) via an isolator (3). Upper and lower receiving parts (40) attached to the generation side part (2)
A plurality of fixtures (4) having (41), and upper and lower isolators (3) and (3) arranged between upper and lower receiving portions (40) and (41) of each fixture (4); The upper and lower isolators (3) and (3) support the support member (1).
0) The seismic isolation structure characterized by being pinched. 2. The isolators (3) and (3) are arranged so as to be inclined so that extensions of the axes of the isolators (3) and (3) are gathered on a vertical line passing through the center of gravity of the structure (1). The seismic isolation structure according to claim 1, wherein: 3. The seismic isolation structure according to claim 1, wherein an initial compressive force is applied to the isolators.