JP3825081B2 - Seismic isolation system and lift prevention device in the seismic isolation system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention has a vertical support function between an upper structure and a lower structure, reduces vibration transmission from the lower structure in the horizontal direction, and has a kinetic energy absorption capability of the upper structure accompanying horizontal displacement. In particular, the present invention relates to a seismic isolation system for a lightweight building structure, a base isolation table, and the like , and a lift prevention device in the base isolation system.
[0002]
[Prior art]
As a seismic isolation device interposed between the upper structure and the lower structure, 1) Laminated rubber body with lead plug, 2) High damping laminated rubber body, 3) Combination of laminated rubber body and viscous damper, 4) Friction pendulum devices, etc. are known.
In 1), the lead plug is responsible for the ability to absorb horizontal displacement, in 2) a highly damped rubber body, in 3) a viscous damper, and in 4) a friction pendulum so-called slider and spherical surface incorporated in the device. Friction bears the ability to absorb horizontal displacement energy.
[0003]
If the upper structure is relatively light weight as middle low-rise buildings, the seismic isolation support device in addition to the structural movement it becomes free, at shall lateral stiffness is taken further reduced than for large structures There, when the strong wind of typhoon or acts, or by the generation of lifting force caused by the ground motion, the building will receive overturning forces, leading to a fall.
For this reason, various countermeasures have been proposed to prevent the lift, and there are ones that are attached to the seismic isolation support device itself and ones that are installed separately (see Japanese Patent Laid-Open No. 60-261870). However, the former has a problem that the directionality is specified, and the latter has a large apparatus, which requires a lot of labor for installation and causes an increase in cost.
[0004]
[Problems to be solved by the invention]
In view of the above circumstances, the present invention has a vertical support function between the upper structure and the lower structure, reduces vibration transmission from the lower structure in the horizontal direction, and has the ability to absorb the kinetic energy of the upper structure accompanying horizontal displacement. An object of the present invention is to obtain an anti-lift device for a seismic isolation system that can be easily installed with a simple structure, without being specified by directionality, in a structural system that includes a seismic isolation support device. .
Another object of the present invention is to obtain a new seismic isolation system by using this specific structure for preventing lifting.
Therefore, the present invention has been made based on the knowledge that this object can be achieved by placing the bent leaf spring vertically.
[0005]
[Means for Solving the Problems]
Specifically, the present invention adopts the following configuration.
The first invention relates to a lift prevention device in a seismic isolation system, which has a vertical support function between an upper structure and a lower structure of a lightweight structure, and reduces vibration transmission from the horizontal lower structure. In addition, in the structure system of a lightweight structure in which the seismic isolation support device having the kinetic energy absorption capability of the superstructure accompanying horizontal displacement is interposed, the device is used as a pair or independently of the seismic isolation support device. And
A casing mainly composed of a box that is installed on the lower structure side and opens upward;
A columnar member mainly composed of a columnar body installed on the upper structure side and inserted into the casing;
A vertical rigid horizontal flexible member with a bent leaf spring disposed in the casing and interposed between the casing and the columnar member, or two steel plates each in a V shape. A longitudinally rigid horizontal flexible member in which each end can be bent via a hinge,
The columnar member is composed of an outer body to which the vertical rigid horizontal flexible member is attached and a central body that is slidably inserted into the outer body.
It is characterized by that.
This anti-lifting device can take a reverse mounting mode with respect to the upper structure and the lower structure.
A second invention relates to a seismic isolation system and incorporates the anti-lifting device of the first invention.
In other words, it has a vertical support function between the superstructure and the substructure of the lightweight structure, reduces vibration transmission from the substructure in the horizontal direction, and has the ability to absorb the kinetic energy of the superstructure accompanying horizontal displacement. In the structure of a lightweight structure that is equipped with a seismic support device,
A casing mainly composed of a box that is installed on the lower structure side and opens upward: a columnar member mainly composed of a column that is installed on the upper structure side and inserted into the casing; and is arranged in the casing. The vertical rigid horizontal flexible member or the two steel plates each formed by a bent leaf spring interposed between the casing and the columnar member are formed in a V shape, and each end is hinged. A vertical rigid horizontal flexible member that is foldable through the outer peripheral body to which the vertical rigid horizontal flexible member is attached and a central body that is slidably fitted into the outer body. A lifting prevention device composed of a pair of or independently of the seismic isolation support device, and restrains the upward displacement of the upper structure with the vertical rigidity of the vertical rigid horizontal flexible member, It is characterized by that.
[0006]
(Function)
In a normal state, that is, a normal state, the load of the upper structure is transmitted to the lower structure via the seismic isolation support device, and the upper structure does not roll due to the predetermined lateral rigidity of the seismic isolation support device. At this time, this anti-lift device does not exhibit a special effect, in other words, does not hinder the function of the above-described seismic isolation support device.
[0007]
When strong winds, such as during a typhoon, act as a crosswind on the upper structure, the upper structure is light, and the lateral isolation of the seismic isolation support device is small. In this lift prevention device, the vertical rigid horizontal flexible member follows this lateral displacement without any restraint, but resists the lift with its vertical rigidity.
The roll is immediately absorbed by the vibration absorbing action of the seismic isolation support device.
[0008]
When seismic motion occurs, the vibration of the lower structure is transmitted to the upper structure via the seismic isolation support device, but the vibration of the upper structure is prolonged by the seismic isolation support device and does not resonate with the natural period of the upper structure. . Thus, the vibration of the superstructure is damped by the energy absorbing action of the seismic isolation support device.
When the roll becomes large, the superstructure will cause a harmful rocking phenomenon, but this anti-lifting device resists this with its vertical rigidity and prevents the lifting.
Of course, the longitudinal vibration included in the seismic wave is also restrained by the present anti-lifting device.
Furthermore, according to the present anti-lifting device, in addition to the above action, the displacement of the seismic isolation support device in the height direction is absorbed in accordance with the roll of the superstructure and the horizontal displacement of the seismic isolation support device. Thereby, generation | occurrence | production of an excessive stress does not arise in this lifting prevention apparatus accompanying a horizontal direction displacement.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Embodiments of a seismic isolation system of the present invention and a lift prevention device in the seismic isolation system will be described with reference to the drawings.
1 to 3 show a lift prevention device S of one mode (first configuration example) . That is, FIGS. 1 and 2 show the overall configuration, and FIG. 3 shows the partial configuration.
In the figure, G is an upper structure as a building structure, and B is a lower structure as a foundation for supporting the upper structure G. The lift prevention device S is interposed between the upper structure G and the lower structure B.
[0010]
With reference to FIG. 1 and FIG. 2, the anti-lift device S of the first configuration example is installed on the casing 1 mainly composed of a square box installed on the lower structure B side, and on the upper structure G side. A columnar member 2 mainly composed of a rectangular columnar body inserted into the casing 1 and a plurality of vertically arranged leaf springs disposed in the casing 1 and interposed between the casing 1 and the columnar member 2 A longitudinally rigid horizontal flexible member 3 made of a material.
[0011]
Hereinafter, the detailed configuration of each part will be described.
Casing 1
The casing 1 includes a square plate-like bottom plate 10 and a square box body 11 that is integrally fixed on the bottom plate 10 and opens upward.
Holes 10a for attachment to the foundation B are opened at a plurality of locations on the side edge of the bottom plate 10.
The square box 11 is open upward and has a space K therein.
Columnar member 2
The columnar member 2 includes a square plate-like upper plate 13 and a square columnar body 14 that is integrally suspended from the center of the lower surface of the upper plate 13.
In the side edge of the upper plate 13, holes 13a for attachment to the upper structure G are opened at a plurality of locations.
The quadrangular prism body 14 is installed at the center of the quadrangular box body 11 of the casing 1, and the outer side surface of the quadrangular column body 14 and the inner side surface of the quadrangular box body 11 are arranged in parallel to each other and at equal intervals. The
[0012]
Vertical rigid horizontal flexible member 3
The vertical rigid horizontal flexible member 3 is provided with a so-called bent leaf spring 16 formed by bending a spring steel plate having a constant thickness in one side, and both sides of each side surface of the rectangular box 11 of the casing 1 and The columnar member 2 is attached to each outer side surface of the square columnar body 14 with mounting bolts 17.
The bent leaf spring 16 exhibits flexibility with respect to a force orthogonal to the plate surface (curved surface) and exhibits rigidity with respect to a force along the plate surface.
Referring to FIG. 3, corresponding to the mounting position of the mounting bolt 17 , screw holes 18 are screwed into the rectangular box body 11 of the casing 1 and the rectangular column body 14 of the columnar member 2, and the bent plate spring 16 is a washer. It is attached to the casing 1 and the columnar member 2 via 19. As a result, the columnar member 2 is held at the center of the rectangular column 14 in the space K of the casing 1 and is displaced in any horizontal direction in the space of the casing 1.
[0013]
The manner of attachment of the anti-lifting device S of the first configuration example to the upper structure G and the lower structure B is as follows.
Per substructure B, the anchor bar 102 is embedded to project the threaded portion 102a to the foundation concrete 100, inserted through the screw portion 102 a of the anchor bar 102 in the mounting hole 10a of the casing 1, threaded clamping nut 104 Tighten and fix.
Attached to the superstructure G is a bolt insertion hole 110 in the floor beam 108 of the building. The screw rod 112 is inserted into the bolt insertion hole 110 and the mounting hole 13a of the columnar member 2 corresponding to the bolt insertion hole 110. The nuts 114 and 116 are screwed into the threaded portion 112a of the threaded rod 112 from above and below, and are fastened and fixed.
[0014]
The lift prevention device S is used by being attached to a seismic isolation support device.
4 and 5 show an example of the arrangement.
In the figure, G is a lightweight building structure as an upper structure, and indicates a general house or a housing complex.
Moreover, D is a seismic isolation support device, and shows a laminated rubber bearing with a lead plug in the illustrated example. That is, this laminated rubber bearing D with a lead plug is formed by sandwiching a lead plug 122 in a laminated rubber body 120 in which steel plates and rubber layers are alternately laminated and sandwiched between upper and lower mounting steel plates 124 and 126. It is attached to the upper structure G and the lower structure B via the mounting steel plates 124 and 126.
The upper structure G is stably supported by the seismic isolation support device D.
The seismic isolation support device D is not limited to a laminated rubber bearing with a lead plug, and other known devices are employed. As such, a high damping laminated rubber body, a combination of a laminated rubber body and a viscous damper, a friction pendulum type device, and the like are employed.
[0015]
In the arrangement | positioning aspect shown in FIG. 5, this lifting prevention apparatus S is independent of the seismic isolation support apparatus D, and is distribute | arranged along the periphery of a building. However, other arrangement modes are not excluded.
[0016]
The anti-lift device S having the above-described configuration is attached to the seismic isolation support device D as described above, and exhibits the following actions.
In a normal state, that is, in a normal state, the load of the upper structure G is transmitted to the lower structure B via the seismic isolation support device D, and the upper structure G does not roll due to the predetermined lateral rigidity of the seismic isolation support device D. It does not occur. At this time, the anti-lifting device S does not exhibit a special effect, in other words, does not hinder the function of the seismic isolation support device D described above.
[0017]
When strong winds, such as during a typhoon, act as a crosswind on the upper structure G in which the lift-up prevention device S is installed, the upper structure G is light and the seismic isolation support device D has a low lateral rigidity. Therefore, floating occurs with rolling. In the present lift prevention device S, the vertical rigid horizontal flexible member 3 follows this lateral displacement without any restraint, but resists lift with its vertical rigidity.
The roll is immediately absorbed by the energy absorbing action of the seismic isolation support device D.
[0018]
When seismic motion occurs, the vibration of the foundation B is transmitted to the upper structure G via the seismic isolation support device D. The seismic isolation support device D causes the upper structure G to have a longer period, and the natural period of the upper structure G There is no resonance. Thus, the vibration is reduced by the energy absorbing action accompanying the plastic deformation of the lead plug of the seismic isolation support device D.
When the rolling of the upper structure G becomes large, a harmful rocking phenomenon occurs in the upper structure G. However, the anti-lifting device S resists this with its vertical rigidity and prevents the rising.
Of course, the vertical vibration included in the seismic wave is also restrained by the lift prevention device S.
[0019]
According to the seismic isolation structure system having the lifting prevention device S of the first configuration, the lightweight upper structure G is effectively prevented from rising due to strong winds or the like without impeding the function of the seismic isolation support device D.
In addition, the present anti-lifting device S has a simple configuration and can be easily installed in the upper structure G and the lower structure B, thereby realizing an economical anti-lifting measure.
[0020]
6 and 7 show a lift prevention device according to another aspect (second configuration example) of the present invention. In the figure, the same reference numerals are assigned to the same members as those in the first configuration example .
This lift prevention device S1 conforms to the previous configuration example with respect to the casing 1 and the columnar member 2, but the longitudinally rigid horizontal flexible member 3A abuts two flat steel plates 21 in a V shape, A hinge 22 is joined to the butted portion so as to be freely opened and closed. The other end of each steel plate 21 is fixed to the casing 1 and the columnar member 2 with a hinge 23.
As a result, the longitudinally rigid horizontal flexible member 3 </ b> A can be flexed via the three hinges 22 and 23.
[0021]
FIG. 8 shows a floating prevention apparatus of still another aspect (third configuration example) of the present invention.
In the lift prevention device S2 of the third configuration example , the longitudinally rigid horizontal flexible member 3B is an aspect in which the bent leaf springs 25 formed in an annular shape are used, in other words, an aspect in which two bent leaf springs are arranged as a pair. , Take. The bent leaf spring 25 of the vertical rigid horizontal flexible member 3 </ b> B is attached to the casing 1 and the columnar member 2 with mounting bolts 26.
[0022]
FIG. 9 shows still another embodiment (fourth configuration) of the anti-lifting device.
In the lift prevention device S3 having the fourth configuration , the longitudinally rigid horizontal flexible member 3C has a feature. The steel plate 28 is abutted in a V shape via a hinge 29 and arranged opposite to each other. Attached to the casing 1 and the columnar member 2.
[0023]
10 and 11 show a lift prevention device according to an embodiment of the present invention.
The lift prevention device S4 of this embodiment is in accordance with the first configuration example with respect to the casing 1 and the longitudinal rigid horizontal flexible member 3, and the columnar member 2A adopts a composite structure at a portion corresponding to the rectangular column body. That is, the quadrangular columnar body 32 of the columnar member 2A includes an outer body 33 to which the bent leaf spring 16 is attached and a through hole 33a is formed at the center, and a central body 34 that is inserted into the through hole 33a of the outer body 33. And a stopper 35 attached to the lower end of the central body 34. There is a gap α between the upper surface of the central body 34 and the outer body 33. The upper end of the center body 34 is fixed to the upper plate 13, and the stopper 35 is screwed into the screw hole of the center body 34 and fixed. The outer body 33 and the center body 34 can be relatively moved up and down.
According to this configuration, a slight displacement that occurs in the height direction of the seismic isolation support device D due to the horizontal displacement of the seismic isolation support device D is absorbed by the gap α.
[0024]
The configuration of the columnar member 2A can naturally be applied to other configuration examples .
[0025]
The present invention is not limited to the embodiment described above, and various design changes can be made within the scope of the basic technical idea of the present invention. That is, the following aspects are included in the technical scope of the present invention.
1) In each of the above embodiments, the casing 1 is fixed to the lower structure B side, and the columnar member 2 is fixed to the upper structure G side. Even if the columnar member 2 is attached to the lower structure B side on the G side, an equivalent function is exhibited. In this case, the casing 1 opens downward, and the column body 14 of the columnar member 2 is naturally inserted through the opening of the casing 1.
2) In each of the above embodiments, the casing 1 and the columnar member 2 corresponding to the casing 1 have a quadrangular shape, but other shapes are not excluded within the scope meeting the purpose of the present invention. Alternatively, a polygonal shape such as a triangular shape or a pentagonal shape can be adopted.
3) In the examples of FIGS. 10 and 11, the shape of the hole 33a of the outer body 33 is not limited to a circular hole, but may be an elliptical shape, a triangular shape, a quadrangular shape, or other polygonal shapes.
4) Similarly, in the example of FIGS. 10 and 11, a coil spring material 36 may be interposed between the outer end surface of the outer body 33 and the stopper 35.
[0026]
【The invention's effect】
According to the seismic isolation system of the present invention, it is possible to effectively prevent the lighter superstructure from rising due to strong winds or the like without hindering the function of the seismic isolation support device.
In addition, the lifting prevention device of the present invention has a simple configuration and can be easily installed in the upper structure and the lower structure, thereby realizing an economical lifting prevention measure. In addition, due to the absorbing action of the displacement component in the height direction, excessive stress is not generated in the lift prevention device due to the lateral displacement, and the durability of the lift prevention device is increased.
[Brief description of the drawings]
FIG. 1 is a vertical cross-sectional view (a cross-sectional view taken along a line II in FIG. 2 ) of a lift prevention device in a seismic isolation structure system according to an aspect of the present invention (first configuration example ).
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is an enlarged cross-sectional view of a portion III in FIG.
FIG. 4 is an arrangement cross-sectional view in a seismic isolation system.
FIG. 5 is an arrangement plan view thereof.
6 is a vertical cross-sectional view (cross-sectional view taken along the line VI-VI in FIG. 7 ) of the lift prevention device of another aspect (second configuration example) of the present invention.
7 is a sectional view taken along line VII-VII in FIG.
FIG. 8 is a longitudinal sectional view of a lift prevention device according to still another aspect (third configuration example) of the present invention.
FIG. 9 is a longitudinal sectional view of a lift prevention device according to still another aspect (fourth configuration example) of the present invention.
FIG. 10 is a longitudinal sectional view of a lifting prevention device according to an embodiment of the present invention. Figure).
11 is a cross-sectional view taken along line XI-XI in FIG.
[Explanation of symbols]
S, S1, S2, S3, S4 ... Lifting prevention device, D ... Seismic isolation support device, G ... Upper structure, B ... Lower structure, 1 ... Casing, 2 ... Columnar member, 3 ... Vertical rigid horizontal flexible member

Claims (2)

Seismic isolation support that has a vertical support function between the superstructure and the substructure of the lightweight structure , reduces the vibration transmission from the substructure in the horizontal direction, and absorbs the kinetic energy of the superstructure accompanying horizontal displacement Oite the device structure based lightweight structure formed by interposed, a said seismic isolation support device and the pair or separate devices used in,
A casing mainly composed of a box that is installed on the lower structure side and opens upward;
A columnar member mainly composed of a columnar body installed on the upper structure side and inserted into the casing;
A vertical rigid horizontal flexible member with a bent leaf spring disposed in the casing and interposed between the casing and the columnar member, or two steel plates each in a V shape. A longitudinally rigid horizontal flexible member in which each end can be bent via a hinge ,
The columnar member is composed of an outer body to which the vertical rigid horizontal flexible member is attached and a central body that is slidably inserted into the outer body.
An anti-lifting device for a base-isolated structure characterized by that. Seismic isolation support that has a vertical support function between the superstructure and the substructure of the lightweight structure, reduces the vibration transmission from the substructure in the horizontal direction, and absorbs the kinetic energy of the superstructure accompanying horizontal displacement In the structure system of the lightweight structure in which the device is interposed,
A casing mainly composed of a box that is installed on the lower structure side and opens upward: a columnar member mainly composed of a column that is installed on the upper structure side and inserted into the casing; and is arranged in the casing. The vertical rigid horizontal flexible member or the two steel plates each formed by a bent leaf spring interposed between the casing and the columnar member are formed in a V shape, and each end is hinged. A vertical rigid horizontal flexible member that is foldable through the outer peripheral body to which the vertical rigid horizontal flexible member is attached and a central body that is slidably fitted into the outer body. A lifting prevention device composed of a pair of or independently of the seismic isolation support device, and restrains the upward displacement of the upper structure with the vertical rigidity of the vertical rigid horizontal flexible member,
This is a seismic isolation system.

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