JPH10311162A - Base isolated building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent the horizontal displacement caused by locking and to provide a base isolated building having three dimensional function of base isolation capable of effectively providing vertical base isolating efficiency with the whole building. SOLUTION: A first base isolation device for easing vibration acting on a building in the vertical direction is provided to the lower part of the building 1 and, at the same time, a second base isolation device 5 for easing horizontal vibration acting between up and down floor layers is provided to the intermediate floor of the building 1. The first base isolation device is constituted of a footing base isolation device 3 installed at a footing part of the building and easing vibration acting on the building in the vertical direction and locking controlling devices 4 provided between the lower side wall 1b of the building and wall section 2a opposed thereto and controlling the locking of the building.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base-isolated building provided with seismic isolation not only horizontally but also vertically.

[0002]

2. Description of the Related Art In recent years, as a method of constructing various buildings into a seismic isolation structure, a seismic isolation device is interposed in a foundation portion, a middle floor, etc. of the building to propagate from the ground to the building by an earthquake. Various types of seismic isolation buildings have been developed to insulate the oscillating vibration and reduce the stress and deformation generated in the building frame. In general, conventional seismic isolation buildings of this type are installed with seismic isolation devices using laminated rubber and sliding bearings at the foundation of the building so that vibrations acting exclusively on the building in the horizontal direction are buffered. It was done. In addition, during an actual earthquake, not only horizontal but also vertical vibrations are generated. Therefore, against such vertical vibrations, partial seismic isolation devices with cushioning materials installed on each floor and equipment Or by attaching a vibration control device to the beam.

[0003]

However, in the above-mentioned conventional seismic isolation building, if it is attempted to reduce the vertical vibration generated during an earthquake in the whole building, the seismic isolation device is provided on all floors and beams. It is necessary to intervene, and the number thereof becomes enormous, causing an extreme rise in cost. Moreover, it is not practical because it is extremely difficult to adjust each seismic isolation device. Therefore, in order to make the whole of the building seismic isolation against such vertical seismic force, a method of installing a seismic isolation device, such as a spring, that absorbs vibration acting in the vertical direction on the foundation of the building is considered. Can be However, when the vertical seismic isolation device is installed on the foundation in this way, the entire building undergoes rocking deformation during an earthquake, resulting in extremely large horizontal displacement, especially on the upper floors of the building. There is a problem.

SUMMARY OF THE INVENTION The present invention has been made to effectively solve the problems of the conventional seismic isolation building, and effectively prevents horizontal displacement due to rocking, thereby preventing vertical displacement of the entire building. It is an object of the present invention to provide a seismic isolation building having a three-dimensional seismic isolation function that can effectively impart seismic properties.

[0005]

According to the first aspect of the present invention, there is provided a seismic isolation building according to the present invention, wherein a first seismic isolation device for reducing vibration acting on the building in a vertical direction is provided at a lower part of the building. A second seismic isolation device for reducing horizontal vibrations acting on upper and lower floors of the building is installed on the middle floor of the building. Here, the invention according to claim 2 is characterized in that the first seismic isolation device is installed on a foundation portion of the building and reduces vibration acting on the building in a vertical direction; , And a locking suppression device interposed between a lower side wall of the above and a wall portion opposed to the lower side wall to suppress locking of the building.

According to a third aspect of the present invention, the wall portion according to the second aspect is separated from a side wall, a retaining wall, or a seismically isolated portion of the building in the underground portion. According to a fourth aspect of the present invention, there is provided a locking device according to the second or third aspect, wherein the locking suppressing device according to the second or third aspect is relatively slidable in a vertical direction. It is characterized by being a bearing or a laminated rubber bearing.

In the seismic isolation building according to any one of claims 1 to 4, the vertical vibration of the building is buffered by the first seismic isolation device installed at the lower part of the building, and the vibration of the building is reduced. The horizontal displacement generated on the upper floor can be buffered by the second seismic isolation device interposed on the intermediate floor, and thus a three-dimensional seismic isolation function can be exhibited as a whole.
As a result, it is possible to obtain seismic isolation in both the vertical and horizontal directions for the entire building. Can be ensured.

Here, in particular, the building has an underground part,
In the case of a high-rise building, the first seismic isolation device is installed on the foundation of the building to reduce vibration acting in the vertical direction, as in the invention according to claim 2. With a structure including a seismic device, a lower side wall of the building, and a locking suppression device interposed between the lower side wall and the wall portion facing the lower side wall, the vertical seismic isolation device buffers the vibration in the vertical direction and the rocking. By suppressing the horizontal displacement of the building by the restraint device, the horizontal displacement generated on the upper floor of the building due to the rocking can be reliably reduced. In addition, the second seismic isolation device can also alleviate horizontal displacement on the upper floor, so that effective three-dimensional seismic isolation performance can be obtained as a whole.

As the basic seismic isolation device in the first seismic isolation device, a spring, a laminated rubber having elasticity mainly in the vertical direction, a disc spring, a damper, and the like are used. As the locking suppressing device, a laminated rubber or a relative rubber is used. A sliding bearing and a sliding plate which can be slid in the vertical direction can be respectively applied, and as the second seismic isolation device, a laminated rubber or a sliding bearing which can be displaced in a horizontal direction can be applied.

[0010] Further, as the wall portion according to the second aspect, as in the invention according to the third aspect, a non-seismically isolated structure adjacent to the side wall, the retaining wall or the building of the ground in the underground portion. Side walls are applicable. Here, if a sliding bearing is used as the locking suppressing device interposed between the wall and the wall, in particular, as in the invention according to claim 4,
Small vibrations that occur on a daily basis can be suppressed by the frictional force of the sliding bearings. This is more preferable because the sliding bearing causes sliding along the wall portion due to the pressure, and the frictional force generated at that time can exert a damper function of damping the vibration.

[0011]

FIG. 1 shows an embodiment of a base-isolated building according to the present invention. In the figure, reference numeral 1 denotes a base-isolated building (building) having an underground portion 1a and a multi-story floor. It is. The seismic isolation building 1 is designed so that its natural period is sufficiently longer than the predominant period of the ground 2 so that the resonance phenomenon does not occur with the ground 2 during an earthquake. A base seismic isolation device 3 for mitigating vibration acting in the vertical direction is installed on the base of the seismic isolation building 1. Here, as the base seismic isolation device 3, a spring, a thick laminated rubber having elasticity mainly in the vertical direction, a disc spring, a damper, and the like are used. Further, between the side wall 1b of the underground portion 1a of the base-isolated building 1 and the facing wall portion 2a of the ground 2, a locking suppressing device 4 is interposed. This locking restraint device 4 is for restraining the rocking that is going to occur in the base-isolated building 1 in the event of an earthquake, and is made of a laminated rubber or a Teflon plate which can slide relatively vertically and a stainless plate. A slide bearing or a slide plate using rollers is used.

As described above, it is preferable to use a sliding bearing in which a Teflon plate and a stainless steel plate are combined as the locking suppressing device 4. The above-described base seismic isolation device 3 and locking suppression device 4 constitute a first seismic isolation device in the seismic isolation building 1. Further, in the seismic isolation building 1, a second seismic isolation device 5 for reducing horizontal vibrations acting on the upper and lower floors of the ground floor is provided on the middle floor above the ground. Here, as the second seismic isolation device 5, a laminated rubber or a sliding bearing generally used for buffering horizontal displacement in a conventional seismic isolation building is used.

In the base-isolated building 1 having the above-described structure, when an earthquake occurs, the vertical vibration can be buffered by the base base isolation device 3 installed on the base of the base-isolated building 1. The rocking suppression device 4 interposed between the side wall 1b of the basement portion 1a of the base-isolated building 1 and the opposing wall 2a of the ground 2 suppresses the horizontal displacement of the base-isolated building 1, thereby locking. Therefore, the horizontal displacement generated on the upper floor of the base-isolated building 1 can be reliably reduced. In addition, the second seismic isolation device 5 interposed on the middle floor of the seismic isolation building 1 can buffer horizontal displacement occurring on the upper floor.

Therefore, according to the seismic isolation building 1, since the seismic isolation devices 3, 4, and 5 can exert a three-dimensional seismic isolation function as a whole, they can be moved vertically and horizontally with respect to the entire building. It is possible to obtain seismic isolation in both directions, so that high safety, functionality and comfort can be ensured not only for horizontal vibrations but also vertical vibrations generated during an earthquake.

In the above-described embodiment, only the case where the locking suppressing device 4 is interposed between the base-isolated building 1 and the opposing wall 2a of the ground 2 has been described. However, the present invention is not limited to this. In addition, the above-mentioned locking restraint device may be used for other retaining walls or the walls of the adjacent non-isolated building in the above-mentioned seismic isolation building 1, and other adjacent non-isolated non-isolated structures. The same operation and effect can be obtained even if interposed between the side walls of the first embodiment.

[0016]

As described above, according to the seismic isolation building according to any one of claims 1 to 4, the first seismic isolation device installed at the lower part of the building and the intermediate floor of the building are installed. With the second seismic isolation device described above, a three-dimensional seismic isolation function can be exhibited as a whole, and as a result, vertical and horizontal seismic isolation for the entire building can be obtained. In addition to the vertical vibration, high safety, functionality and comfort can be ensured.

In this case, if the first seismic isolation device has a basic seismic isolation device and a locking restraint device as in the second aspect of the invention, the first seismic isolation device can be vertically moved by the basic seismic isolation device. By damping the directional vibration and suppressing the horizontal displacement of the building by the locking suppression device,
The displacement in the horizontal direction that occurs on the upper floor of the building due to the locking can be reliably reduced, and furthermore, the fourth aspect of the present invention is further described.
If a sliding bearing is used as a locking restraining device as in the invention described in (1), small vibrations that occur on a daily basis can be suppressed by frictional force, and against vertical displacement generated during an earthquake, , The frictional force generated by the slip can provide an excellent effect of providing a damper function for attenuating the vibration.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a seismic isolation structure according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seismic isolation building 1a Underground part 1b Side wall 2 Ground 2a Wall part 3 Base seismic isolation device (first seismic isolation device) 4 Locking restraint device (first seismic isolation device) 5 Second seismic isolation device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Momoko Watanabe 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (4)

[Claims] 1. A first seismic isolation device for mitigating vibration acting on a building in a vertical direction at a lower part of the building, and a horizontal direction acting on an intermediate floor of the building on an intermediate floor of the building. A seismic isolation building characterized by interposing a second seismic isolation device that reduces vibration of the building. 2. The base seismic isolation device installed on a foundation portion of the building to reduce vibration acting on the building in a vertical direction; a lower side wall of the building; The seismic isolation building according to claim 1, further comprising: a locking suppression device interposed between the wall and a facing wall portion, the locking suppression device configured to suppress locking of the building. 3. The structure according to claim 2, wherein the wall portion is a side wall of a ground, a retaining wall, or a side wall of a structure separated from a seismically isolated portion of the building in an underground portion. The seismic isolation building described. 4. The seismic isolation building according to claim 2, wherein the locking suppressing device is a sliding bearing or a laminated rubber bearing that can slide relatively vertically.