JP5231787B2 - Seismic isolation building - Google Patents

Description

The present invention provides a base-isolated building in which a base-isolation device is interposed between the upper structure portion and the lower structure portion constituting the building in accordance with the respective column positions where the vertical axial force from the upper structure portion acts. About.

Conventionally, as this type of seismic isolation building, there are many examples in which seismic isolation devices using laminated rubber bearings are installed according to the column positions of the upper structure and lower structure of the building. In particular, the structure is configured such that the seismic isolation effect can be exhibited by transmitting the vibration from the ground to the upper structure portion of the building with a long period using the seismic isolation device.
In the case of this laminated rubber bearing, the lower the horizontal rigidity, the easier it is to increase the period of the rolling vibration of an earthquake. There is a risk of amplification by the device.
For example, in a structure such as a semiconductor manufacturing factory, since production equipment that performs fine control and frame is installed, vibration suppression can be caused even if it is a minute vibration. There is a need to try.
From such a technical background, as a conventional seismic isolation building, there is one that adopts a sliding bearing having high rigidity in both the vertical direction and the horizontal direction as a seismic isolation device (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2006-2559 (FIG. 1)

  According to the conventional seismic isolation building described above, by using a rigid sliding bearing, the seismic isolation device that supports the vibrations generated at the floor of the upper structure at both ends of the floor span is amplified. It can be suppressed. However, even if both ends of the floor span are supported by a highly seismic isolation device, the restraint force relating to the vertical vibration of the floor itself cannot be exhibited, and the problem of floor vibration still remains.

  Therefore, the object of the present invention is to eliminate the above-mentioned problems and to prevent vibrations acting on the floor while suppressing the same seismic isolation effect as before with respect to rolls during an earthquake. There is a building to offer.

The first characteristic configuration of the present invention is that a seismic isolation device is interposed between an upper structure portion and a lower structure portion constituting a building in accordance with each column position where a vertical axial force acts from the upper structure portion. In the seismically isolated building, a support device for supporting the floor portion of the upper structure portion on the lower structure portion in the middle of a span where a vertical axial force from the upper structure portion does not act is provided. The upper structure portion and the lower portion are configured to reduce frictional resistance due to mutual contact by a sliding body fixed to the upper structure portion and a slide receiving portion fixed to the lower structure portion. The sliding bearing is provided with a sliding mechanism that allows a side-sliding movement relative to the structure.

According to the first characteristic configuration of the present invention, there is provided a support device for supporting the floor portion of the upper structure portion on the lower structure portion in the middle of the span where the vertical axial force from the upper structure portion does not act . the supporting equipment, since are constituted by sliding bearings having a sliding mechanism that allows relative lateral sliding movement between the upper structure unit and a lower structure unit, the support span of the floor by the supporting device Therefore, the rigidity can be increased without increasing the cross-sectional area of the floor portion, and the vibration of the floor portion can be suppressed accordingly.
Moreover, since the supporting device are composed of a sliding bearing having a pre-Symbol slide mechanism, during an earthquake, in terms of fulfilling the seismic isolation effect by the seismic isolation device (long period of the upper structure portion against rocking vibration) The slide mechanism can tolerate relative lateral movement between the upper structure portion and the lower structure portion, and can normally obtain a seismic isolation effect without adversely affecting the seismic isolation function of the above-described seismic isolation device. Can be supported as
Therefore, according to the present invention, it is possible to suppress vibrations acting on the floor portion while exhibiting the same seismic isolation effect as before with respect to rolls during an earthquake.

  According to a second characteristic configuration of the present invention, the floor portion includes a large beam, a small beam, and a floor slab, and the support device is a central portion of any of the large beam, the small beam, and the floor slab. It is in the place where it is installed to support

According to the second characteristic configuration of the present invention, in addition to achieving the above-described operational effect according to the first characteristic configuration of the present invention, the support device can be any of the large beam, the small beam, and the floor slab. The support span of the large beam, the small beam, or the floor slab supported by the support device has the same value on both the left and right sides of the support device, and is supported in any span. The same vibration suppressing effect can be exhibited.
As a result, there is little variation in the vibration suppression effect, and it is possible to efficiently suppress the vibration of the floor portion.

  According to a third characteristic configuration of the present invention, the support device is provided with a height adjusting mechanism capable of changing and fixing the device height.

According to the third characteristic configuration of the present invention, in addition to being able to achieve the above-described operational effects according to the first or second characteristic configuration of the present invention, a height adjusting mechanism is provided. By adjusting the height (supporting force adjustment) in the support state, the rigidity of the floor of the upper structure supported by the support device can be changed, and as a result, the natural frequency of the floor varies. It becomes possible to make it. Therefore, it is possible to suppress the vibration of the floor by adjusting the support force of the support device by the height adjustment mechanism so that the natural frequency is less likely to resonate with the vibration applied to the floor. It becomes. Such an operational effect can be exhibited, for example, in a semiconductor factory or the like when the load on the floor changes due to a change in the layout of the manufacturing equipment, and the floor portion is likely to vibrate. It is possible to prevent vibrations that adversely affect the vibration isolator being transmitted.
In addition, as a different effect, it becomes possible to easily change and adjust the support height of the support device according to the creep deformation of the seismic isolation device, and to achieve support of the floor portion in a stable support state over a long period of time. Therefore, it is possible to maintain a good vibration suppressing action.

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

[First Embodiment]
1 and 2 show a first embodiment of a base-isolated building according to the present invention. The base-isolated building B includes an upper structure portion 1 between an upper structure portion 1 and a lower structure portion 2. The seismic isolation device M is interposed in accordance with the position of the three pillars.

The upper structure portion 1 is provided with a large beam 4a in a state extending over the adjacent columns 3, and a small beam 4b is provided over a central portion of the arranged large beam 4a. The floor slab 4c is formed by the large beam 4a and the small beam 4b. It is supported integrally.
Here, the large beam 4a, the small beam 4b, and the floor slab 4c are referred to as a floor portion 4.

Between the upper structure portion 1 and the lower structure portion 2, a support device 5 for supporting the middle of the span of the floor portion 4 on the lower structure portion 2 is provided.
Specifically, the installation plane position of the support device 5 is set at the intersection of the small beams 4 b in the floor 4. Therefore, the support span of the floor portion 4 can be halved with respect to the entire span between normal columns, and the vibration of the floor portion 4 can be suppressed.
The support device 5 is configured as a so-called “sliding bearing”, and as shown in FIG. 3, a metal slip receiving portion 5 a fixed to the lower structure portion 2 and a metal fixed to the upper structure portion 1. The sliding body 5b is configured so as to be in contact with the sliding body 5b on the sliding receiving part 5a, so that the sliding body 5b moves laterally along the sliding receiving part 5a. be able to. In order to reduce the frictional resistance between them, a resin coating is applied to the upper surface of the slide receiving portion 5a, and a fluororesin is provided on the lower surface of the sliding body 5b.
That is, the support device 5 allows the relative lateral movement of the upper structure portion 1 and the lower structure portion 2, and the slide receiving portion 5a and the slide body 5b constitute a slide mechanism S.

The seismic isolation device M is configured as a so-called “seismic isolation rubber bearing”, and as shown in FIG. 4, a plurality of metal thin plates 6a and rubber thin plates 6b are alternately stacked and integrated. A portion 6 and a metal fixing plate 7 integrally provided on the upper and lower end surface portions of the deformable portion 6 are provided. The fixing plate 7 is attached to a building installation target portion by means such as bolt fixing.
The thin metal plates 6a, the thin rubber plates 6b, etc. are formed in such a manner that they can be displaced in the horizontal direction between the thin plates, so that the thin plates can be moved laterally against a roll such as an earthquake. It is constructed so that it resists while moving relative to and can exhibit the seismic isolation effect.

According to the seismic isolation building of the present embodiment, the support device 5 can reduce the support span of the floor 4 compared to the conventional case, and can suppress the vibration of the floor 4.
In addition, in the event of an earthquake, the slide mechanism S is connected to the upper structure portion 1 and the lower structure portion 2 in order to achieve the seismic isolation effect (longer period of the upper structure portion with respect to roll vibration) by the seismic isolation device M. Relative lateral movement can be allowed, and it can be supported so that the seismic isolation effect can be normally obtained without adversely affecting the seismic isolation function of the above-described seismic isolation device.
Furthermore, the support device 5 is installed in a state of supporting a position where the beam 4b intersects, that is, the center of the beam 4b and the center of the floor 4. In addition, it is possible to achieve support in a state without bias, there is little variation in the vibration suppression effect, and it is possible to efficiently suppress the vibration of the floor portion.

[Second Embodiment]
FIG. 5 shows a second embodiment of the base-isolated building of the present invention, and the description of the configuration common to the base-isolated building of the first embodiment is omitted, and different configurations are mainly described.

The configuration of the floor portion 4 is different from that of the previous embodiment, and the small beams 4b are installed only on the two large beams 4a arranged opposite to each other among the four large beams 4a installed in a rectangular plane shape. The floor slab 4c is integrally supported by the large beam 4a and the small beam 4b.
And the two small beams 4b are provided, and are constructed at intervals in the parallel arrangement direction.

  On the other hand, the support device 5 is arranged across the positions corresponding to the centers of the two small beams 4b, and is installed in a state where the middle of the span of the floor portion 4 is supported by the lower structure portion 2.

  Also in this embodiment, the support span of the floor portion 4 can be shortened, and the vibration of the floor portion 4 can be suppressed.

[Third Embodiment]
FIG. 6 shows a third embodiment of the base-isolated building of the present invention. The description of the configuration common to the base-isolated building of each of the above-described embodiments is omitted, and different configurations are mainly described. .

The configuration of the floor portion 4 is different from that of the previous embodiment, and the small beams 4b are installed only on the two large beams 4a arranged opposite to each other among the four large beams 4a installed in a rectangular plane shape. The floor slab 4c is integrally supported by the large beam 4a and the small beam 4b.
One small beam 4b is constructed from the center of one large beam 4a to the center of the other large beam.

  On the other hand, the support device 5 is disposed at a position corresponding to the center of the small beam 4 b and is installed in a state in which the lower structure portion 2 supports the middle of the span of the floor portion 4.

  Also in this embodiment, the support span of the floor portion 4 can be made half the length of the entire span between normal columns, and the vibration of the floor portion 4 can be suppressed.

[Fourth Embodiment]
FIG. 7 shows a fourth embodiment of the base-isolated building of the present invention, and the description of the configuration common to the base-isolated building of each of the above-described embodiments is omitted, and different configurations are mainly described. .

  The configuration of the floor 4 is different from that of the previous embodiment, and the floor slab 4c is integrally supported by four large beams 4a installed in a rectangular planar shape. That is, no beam is provided.

  And the support apparatus 5 is arrange | positioned in the position which hits the center of the floor slab 4c, and is installed in the state which makes the said lower structure part 2 support the middle of the span of the said floor part 4. FIG.

  Also in this embodiment, the support span of the floor portion 4 can be made half the length of the entire span between normal columns, and the vibration of the floor portion 4 can be suppressed.

[Another embodiment]
Other embodiments will be described below.

<1> The base-isolated building B is not limited to the configuration described in the previous embodiment, and the structure and shape of the upper structure portion 1 and the lower structure portion 2 can be set as appropriate.
Further, the present invention is not limited to a seismically isolated building built as a new construction, and may be an seismic isolated building in which an existing seismic isolation device is installed in an existing building for seismic isolation. Moreover, you may make it the seismic isolation building concerning the said invention by attaching the said support apparatus later to the existing seismic isolation building.
<2> The seismic isolation device M is not limited to the one constituted by the laminated rubber bearing described in the previous embodiment. For example, various seismic isolation devices such as a sliding bearing or a combination of dampers are adopted. be able to.
<3> The support device 5 is not limited to the configuration described in the previous embodiment, and the configuration can be appropriately changed. In short, the floor portion 4 of the upper structure portion 1 is placed in the middle of the span. In addition, a slide mechanism S that allows relative lateral movement of the upper structure portion 1 and the lower structure portion 2 regardless of whether they are separate or integrated is provided. These may be referred to collectively as a support device.
In addition, the support device 5 may be provided with a height adjustment mechanism J that can be fixed by changing the height of the device regardless of whether it is separate or integrated. As a specific example, as shown in FIG. 8, the height adjustment mechanism J includes a jack configured in a lower part (or an upper part) of the support device 5. If the height adjustment mechanism J is provided, in addition to being able to adjust the height so that the optimum support force of the support device 5 can be ensured, for example, adjusting the support force accompanying the height change Can do. By adjusting the support force to the upper structure portion 1, the axial rigidity of the support device 5 can be changed, and the natural frequency of the floor portion 4 of the upper structure portion supported by the support device 5 can be changed. It becomes. Therefore, it is possible to support the floor portion in a state in which the floor portion hardly resonates with respect to vibration applied to the floor portion.
By the way, the natural frequency of the floor that changes due to the action of the height adjustment mechanism of the support device varies depending on the dimensions and physical properties of the floor, so it cannot be shown generally. The natural frequency of the floor portion tends to increase as the supporting force of the portion increases. As an example, a natural vibration frequency of 35 Hz is obtained by applying a supporting force of 10 t by the support device to a floor portion that exhibits a natural frequency of 25 Hz with the support device just in contact. There is a changed case.
As another effect, when the seismic isolation device is composed of, for example, a seismic isolation rubber bearing that may cause creep deformation, the support height of the support device 5 is adjusted according to the creep deformation. It is possible to easily change and adjust, and it is possible to achieve the support of the floor portion 4 in a stable support state over a long period of time, and it is possible to maintain a good vibration suppressing action.
<4> The arrangement of the support device 5 is not limited to the position of the small beam 4b or the floor slab 4c as in each of the embodiments described in the previous embodiment. For example, the support device 5 is installed at the position of the large beam 4a. It may be. Therefore, the number of places can be increased as appropriate, without being limited to installing the support device 5 only at one place on the floor 4 of the minimum unit. As an example, as shown in FIG. 9, you may install in the intermediate part of the four large beams 4a, respectively.
In addition, the arrangement of the support device 5 with respect to each floor portion 4 may be in the middle of the span, and is not necessarily limited to the center of the span, in any case of the large beam 4a, the small beam 4b, and the floor slab 4c. It is not a thing. Therefore, it may be installed in a plurality of places at intervals in the middle of the span.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

Front sectional view showing the main part of the base-isolated building Plan view showing the main parts of the seismic isolation building Front view schematic diagram showing the support device Front view schematic diagram showing seismic isolation device The top view which shows the principal part of the seismic isolation building of another embodiment The top view which shows the principal part of the seismic isolation building of another embodiment The top view which shows the principal part of the seismic isolation building of another embodiment Front view sectional drawing which shows the principal part of the seismic isolation building of another embodiment The top view which shows the principal part of the seismic isolation building of another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper structure part 2 Lower structure part 3 Pillar 4 Floor part 4a Large beam 4b Small beam 4c Floor slab 5 Support apparatus J Height adjustment mechanism M Seismic isolation apparatus S Slide mechanism

Claims (3)

A base-isolated building in which a base isolation device is interposed between the upper structure portion and the lower structure portion constituting the building according to each column position where the vertical axial force from the upper structure portion acts,
There is provided a support device for supporting the floor portion of the upper structure portion to the lower structure portion in the middle of a span where a vertical axial force from the upper structure portion does not act, and the support device is fixed to the upper structure portion Relative sliding between the upper structure portion and the lower structure portion in a state in which the frictional resistance associated with mutual contact is reduced by the sliding body and the slide receiving portion fixed to the lower structure portion. A base-isolated building that consists of a sliding bearing with a sliding mechanism that allows movement.   The floor portion includes a large beam, a small beam, and a floor slab, and the support device is installed to support a central portion of any of the large beam, the small beam, and the floor slab. Item 1. Seismic isolation building according to item 1.   The seismic isolation building according to claim 1, wherein the support device is provided with a height adjustment mechanism that can be fixed by changing a device height.

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