JP2006292155A - Base isolation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolation structure coping with rolling of a structure becoming large amplitude by an earthquake or the like, having a damping damper. <P>SOLUTION: This base isolation structure has: base isolation bearings 1 disposed between a ground B side and the structure A side, functioning such that the rolling on the ground B side is not inputted to the structure A; a damping damper 2 for large amplitude disposed between the ground B side and the structure A side, functioning such that the damping damper 2 calms down the rolling becoming the large amplitude in the structure A; and a damping damper 3 for small amplitude disposed between the ground B side and the structure A side, functioning such that the damping damper 3 calms down the rolling becoming the small amplitude in the structure A. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seismic isolation structure, and in particular, can cope with rolls in a structure having a large amplitude caused by an earthquake or the like and can also deal with rolls in a structure having a small amplitude caused by an earthquake or the like. Related to the seismic isolation structure.

  As a seismic isolation structure that allows the structure to cope with the roll of the ground due to an earthquake or the like, there have conventionally been various proposals. For example, in the proposal disclosed in Patent Document 1, the structure side and the ground side The seismic isolation bearing, one end of which is connected to the structure and the other end is connected to the ground, and the other end is connected to the structure and the other end is connected to the structure. A damping damper connected to the ground.

  At this time, the seismic isolation bearing is assumed to be a rolling bearing in the above-mentioned Patent Document 1, and is assumed to be composed of an elastic bearing, an elastic sliding bearing or a combination thereof in Patent Document 2, and the damping damper is disclosed in Patent Documents 1 and 2. Therefore, it is assumed that the damper is composed of an oil damper, and in particular, the damping damper in Patent Document 1 is provided with a switching valve that enables selection of whether expansion or contraction is possible.

Therefore, in the proposal disclosed in Patent Document 1, for example, when the ground roll due to an earthquake or the like is input to the structure, the ground roll is directly input to the structure by the seismic isolation support. In addition, when the structure rolls due to an earthquake or the like, the roll in the structure can be quickly calmed by the damping damper.
JP-A-9-264376 (paragraph 0002, FIG. 2) Japanese Patent Laid-Open No. 11-190149 (Claims Claim 4, Paragraph 0012, FIG. 3)

  However, in the conventional seismic isolation structure described above, when the structure rolls with a large amplitude due to an earthquake or the like, this can be calmed down. It may be pointed out that it cannot be effectively prevented.

  That is, the damping damper in the seismic isolation structure disclosed in Patent Document 1 described above is the same, but in the case of a damping damper of the kind, the structure often has a large amplitude due to an earthquake or the like. When swinging, it is configured to realize a damping action that quickly calms down the roll in the structure having a large amplitude.

  Therefore, in the above-described damping damper, when the roll in the structure caused by an earthquake or the like has a small amplitude, it is impossible to realize a damping action according to this, and it is impossible to realize the calming down.

  At this time, it can be said that by turning the damping damper in a so-called locked state by the operation of the switching valve of the damping damper, it is possible to prevent a small amplitude roll in the structure. In that case, since the so-called gap leakage of the hydraulic fluid and the contraction of the hydraulic fluid are manifested, it can be said that the roll of small amplitude in the structure cannot be realized in the above-described locked state.

  As a result, in a seismic isolation structure having a damping damper to quickly calm down the rolls in a structure that has a large amplitude due to an earthquake, etc., even if the damping damper is locked, the small amplitude For example, when the structure is assumed to be a residence, there is a problem that the comfortability in the residence is deteriorated.

  The present invention was created in view of the above circumstances, and the object of the present invention is to provide a seismic isolation system capable of dealing with rolls in a structure having a damping damper and a large amplitude caused by an earthquake or the like. To provide a seismic isolation structure that is optimal for expecting improved versatility by allowing it to cope with rolls in a structure having a small amplitude.

  In order to achieve the above object, the structure of the seismic isolation structure according to the present invention is basically arranged between the ground side and the structure side so as not to input the ground side roll to the structure. A seismic isolation bearing, a large-amplitude damping damper that is placed between the ground side and the structure side and functions to calm the large-amplitude rolls in the structure, and between the ground side and the structure side. Suppose that it has a small-amplitude damping damper that is arranged in between and functions to calm down the rolls of small amplitude in the structure.

  Therefore, the present invention has a seismic isolation bearing between the structure side and the ground side, and a large-amplitude damping damper that functions to calm down the large-amplitude roll in the structure. In this seismic isolation structure, half or almost half of the seismic isolation bearings are replaced with elastic rolling bearings or elastic sliding bearings, and the elastic rolling bearings or elastic sliding bearings function to calm rolls with a small amplitude in the structure. It is possible to cope with rolls in structures with small amplitudes caused by earthquakes, etc. while coping with rolls in structures with large amplitudes caused by earthquakes, etc. only by connecting damping dampers for small amplitudes. become.

  In addition to the large-amplitude damping damper, it has a small-amplitude damping damper with a different guarantee area, so it can be guaranteed with the large-amplitude damping damper when calming the roll of the structure. An area that is not present can be assured by the small-amplitude damping damper, and therefore, rapid calming of the roll in the structure caused by an earthquake or the like can be efficiently realized.

  Hereinafter, the present invention will be described based on the illustrated embodiment. As shown in FIG. 1, the seismic isolation structure according to the present invention basically includes a seismic isolation bearing 1 and a large-amplitude damping damper 2. And a small-amplitude damping damper 3.

  First, the seismic isolation bearing 1 is connected between the ground B side and the structure A side, for example, one end is connected to the ground B side, while the other end is connected to the structure A side, In order to prevent the roll on the ground B side from propagating to the structure A side, in general, in addition to the elastic bearing 11 made of a rubber column such as a laminated rubber as shown, a ball isolator or the like is not shown. And a sliding bearing having a sliding plate and the like.

  In the present invention, an arbitrary number of seismic isolation bearings 1, that is, in many cases, half or almost half of the seismic isolation bearings 1 comprise the elastic rolling bearings 12 shown in FIG. The elastic sliding bearing 13 shown in FIG.

  At this time, as shown in FIG. 1, the elastic rolling support 12 is composed of a combination of an elastic part 12a made of a rubber plate or a rubber column and a rolling part 12b made of a ball isolator, etc. As shown in FIG. 2, the elastic part 13a made of a rubber plate or a rubber column and a sliding part 13b having a sliding plate are used.

  Incidentally, in the elastic rolling bearing 12 shown in FIG. 1, the rolling portion 12b is disposed on the ground B side, and the elastic portion 12a connected to the upper end of the rolling portion 12b is connected to the structure A side. Also in the elastic sliding bearing 13 shown in FIG. 2, the sliding portion 13b is arranged on the ground B side, and the elastic portion 13a connected to the upper end of the sliding portion 13b is connected to the structure A side.

  Next, the large-amplitude damping damper 2 is arranged between the ground B side and the structure A side, and one end is connected to the ground B, for example, whereas the other end is connected to the structure A. Thus, the rolling on the side of the structure A with respect to the ground B side is calmed down. In the figure, it is composed of an oil damper, and as shown in FIG. 1, this is similarly applied to the cylinder body 21 constituting this oil damper. It is assumed that the rod body 22 constituting the oil damper is inserted so as to be able to appear and retract.

  Incidentally, in the oil damper as the large-amplitude damping damper 2, the same magnitude of damping force is obtained during the so-called expansion / contraction operation in which the rod body 22 protrudes and retracts with respect to the cylinder body 21, that is, on the extension side and Although not shown in the figure, it is preferable that the two rods are formed so that the damping effect at the time of each operation on the compression side is the same.

  When the oil damper is formed into a double rod type, the diameter of each rod body 22 is the same, and a piston body (not shown) connected to each rod body 22 is defined in the cylinder body 21. The pressure receiving areas in the two oil chambers (not shown) formed are preferably the same.

  The large-amplitude damping damper 2 is not shown in place of the oil damper formed in the cylindrical shape as long as a predetermined damping action, that is, so-called energy absorption is possible. Any configuration such as a damper may be selected.

  Of course, the cylinder body 21 may be integrally held on the structure A side when the oil damper as the large-amplitude damping damper 2 is disposed at a predetermined position. It is.

  By the way, in the present invention, the oil damper as the large-amplitude damping damper 2 described above is, for example, a speed at which the piston body slides within the cylinder body 21, that is, when the piston speed is in a speed region higher than a low speed. It is assumed that it is set so as to be damped by the flow of the hydraulic oil, and it is assumed that proper operation is performed in the operating region of the oil damper having a large capacity.

  That is, as described above, in the large-amplitude damping damper 2 as this kind of damping damper constituting the seismic isolation structure, for the purpose of calming the roll of the structure A with respect to the ground B. In many cases, for example, as shown by a solid line in FIG. 3, the flow of hydraulic oil in a speed region (region indicated by symbol “a” in FIG. 3) where the piston speed becomes a low speed or higher is a so-called large stroke. In other words, a predetermined damping force can be generated by the flow of a large amount of hydraulic oil during operation.

  Therefore, in the large-amplitude damping damper 2, as indicated by a broken line in FIG. 3, the flow of hydraulic oil in a speed region (region indicated by symbol b in FIG. 3) from a very low speed to a low speed. Therefore, depending on the flow of hydraulic oil, which is a small amount due to expansion / contraction with a so-called small stroke, an appropriate damping force cannot be generated.

  In view of this, it is an object of the present invention to ensure an appropriate damping force as indicated by a virtual line in FIG. 3 in a region where the appropriate damping force cannot be generated. The small-amplitude damping damper 3 is also arranged in the seismic isolation structure having the amplitude damping damper 2.

  From this, the small-amplitude damping damper 3 according to the present invention can realize predetermined energy absorption, that is, any configuration can be selected as long as it generates a predetermined damping force. However, in order to increase the so-called feasibility, it is assumed that it is composed of an oil damper in the same manner as the large-amplitude damping damper 2 described above.

  At this time, it is considered that the configuration of the oil damper is the same as that of the oil damper as the large-amplitude damping damper 2 so that the generated damping force can be made linearly continuous.

  In addition, in this embodiment, the oil damper as the small-amplitude damping damper 3 has a damping action depending on the piston speed as described above, and in a speed region where the piston speed is from a very low speed to a low speed. It is assumed that it is set so as to be damped by the flow of hydraulic oil.

  On the other hand, the small-amplitude damping damper 3, that is, the oil damper, is connected to the structure A with one end and the other end is the seismic isolation bearing 1 shown in FIG. 1 or the elastic sliding bearing shown in FIG. 13, thereby preventing the structure A from rolling regardless of the situation on the ground B side, that is, for example, to prevent the structure A from rolling due to the wind. Become.

  At this time, in the elastic rolling bearing 12 as the seismic isolation bearing 1, the rolling part 12 b distributed on the ground B side is coupled to the elastic part 12 a coupled to the lower end of the structure A, and the seismic isolation bearing 1. In the elastic sliding bearing 13, the sliding portion 13b distributed on the ground B side is connected to the elastic portion 13a connected to the lower end of the structure A.

  At this time, the spring constants of the elastic portions 12a and 13a are set to be smaller than the spring constant of the elastic bearing 11 made of a rubber column such as the laminated rubber as the seismic isolation bearing 1. It is set so that the elastic portions 12a and 13a can be deformed before the elastic support 11 is deformed.

  Incidentally, the deformation in the elastic portions 12a and 13a is naturally manifested before the rolling portion 12b or the sliding portion 13b is actuated as described above in connection with the so-called prior art.

  Therefore, in the structure A having the small-amplitude damping damper 3 between the elastic rolling bearing 12 or the elastic sliding bearing 13 as the seismic isolation bearing 1, the elastic rolling bearing 12 or the elastic sliding bearing as the seismic isolation bearing 1 is used. When the structure A rolls with a small amplitude because the elastic parts 12a and 13a are easily deformed, the roll in the structure A can be calmed by the small-amplitude damping damper 3.

  From this, the seismic isolation bearing 1 to which the small-amplitude damping damper 3 is connected is, for example, as shown in FIG. The spring constant in the elastic part 14b on the structure A side above the flange part 14a is set to be smaller than the spring constant in the column part 14c on the ground B side below the flange part 14a. In this state, the other end of the small-amplitude damping damper 3 may be connected to the flange portion 11a.

  In the seismic isolation structure according to the present invention formed as described above, the seismic isolation bearing 1 and the large-amplitude damping damper 2 that functions to calm the large-amplitude roll in the structure A are provided. By coordinating the small-amplitude damping damper 3 that functions to calm down the small-amplitude roll in the structure A in the seismic structure, while dealing with the roll in the structure A that has a large amplitude caused by an earthquake or the like Similarly, the roll in the structure A having a small amplitude caused by an earthquake or the like can be dealt with.

  Incidentally, at this time, half or almost half of the seismic isolation bearings 1 arranged between the structure A side and the ground B side are the elastic rolling bearings 12 or the elastic sliding bearings 13, and this elastic rolling bearing is provided. Needless to say, the small-amplitude damping damper 3 is connected to the twelve or elastic sliding bearing 13.

  As a result, according to the present invention, in the existing seismic isolation structure, half or almost half of the distributed seismic isolation bearings 1 are replaced with the elastic rolling bearings 12 or the elastic sliding bearings 13 while the small-amplitude damping damper 3 is used. It is possible to realize this by simply adding the, and it can be expected to improve its versatility without incurring an unnecessarily high cost.

  In addition, the seismic isolation structure according to the present invention has the small-amplitude damping damper 3 having a different security area in addition to the large-amplitude damping damper 2, so that the roll of the structure A is calmed down. Therefore, a region that cannot be secured by the large-amplitude damping damper 2 can be secured by the small-amplitude damping damper 3, and thus the rolls of the structure A caused by an earthquake or the like can be quickly settled down. Will be realized efficiently.

  FIG. 5 shows a seismic isolation structure according to another embodiment of the present invention. Hereinafter, the seismic isolation structure shown in FIG. 5 will be described with reference to FIGS. Like the seismic isolation structures shown in FIG. 3, the large-amplitude damping damper 2 and the small-amplitude damping damper 3 are connected in series, and a pseudo ground F is formed between the seismic isolation bearing 1 and the structure A. It is arranged that one end of the small-amplitude damping damper 3 is connected to the structure A while the other end is connected to the pseudo-ground F, while one end of the large-amplitude damping damper 2 is on the ground B side. The other end is connected to the pseudo ground F while being connected.

  At this time, the seismic isolation bearing 1, the large-amplitude damping damper 2 and the small-amplitude damping damper 3 have the same configuration as the above-described seismic isolation bearing 1, the large-amplitude damping damper 2 and the small-amplitude damping damper 3. And there is no difference in the functioning place.

  In addition, since the pseudo ground F is supported by the seismic isolation bearing 1, from the ground B side and the structure A side, it is assumed to be a part of the seismic isolation bearing 1, and this Therefore, the large-amplitude damping damper 2 may be connected to the structure A so as to dodge the pseudo ground F as shown in a virtual diagram in FIG. good.

  And in embodiment shown in figure, between the structure A and the pseudo ground F, the support 4 which makes a deformation | transformation limit small compared with the lower base-isolation support 1, ie, makes a spring constant small, is arranged. It is supposed to become.

  Therefore, even in the seismic isolation structure shown in FIG. 5, as in the case of the above-described seismic isolation structure, the small-amplitude damping damper 3 is provided between the pseudo ground F on the seismic isolation bearing 1 side. In the structure A, since it has the support 4 with the pseudo ground F, when it rolls in the wind, the small-amplitude damping damper 3 functions to calm down the roll of the structure A. .

  As a result, according to the present invention, it is possible to realize the present invention simply by adding the small-amplitude damping damper 3 to the existing seismic isolation structure, and it is possible to improve the versatility without incurring a high cost. It can be expected.

  In the above description, the large-amplitude damping damper 2 and the small-amplitude damping damper 3 embodying the present invention have been described as performing a predetermined damping action depending on the piston speed, but the present invention is intended. As a result, since it is possible to cope with a roll having a large amplitude in the structure A and to deal with a roll having a small amplitude, as long as this can be realized, the stroke amount of the piston In other words, of course, it may be set to exhibit a predetermined attenuation function depending on the amplitude of expansion and contraction.

  In the above description, the large-amplitude damping damper 2 and the small-amplitude damping damper 3 are each composed of an oil damper. However, according to the intention of the present invention, predetermined energy absorption is realized. Of course, the fluid used may consist of water instead of oil.

It is a figure which shows one Embodiment of the seismic isolation structure by this invention. It is a figure which shows in principle the other embodiment of the seismic isolation structure by this invention. It is a figure which shows the characteristic of the damping force with respect to piston speed. It is a figure which shows the state with which the damping damper for small amplitudes is connected with the seismic isolation bearing by other embodiment similarly to FIG. It is a figure which shows the seismic isolation structure by other embodiment similarly to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seismic isolation bearing 2 Damping damper for large amplitudes 3 Damping damper for small amplitudes 11 Elastic bearings 12 Elastic rolling bearings 12a, 13a Elastic parts 12b Rolling parts 13 Elastic sliding bearings 13b Sliding parts 14 Elastic struts A Structure G Ground

Claims (6)

A seismic isolation bearing that is distributed between the ground side and the structure side and functions to prevent the ground side roll from being input to the structure, and a large amplitude in the structure that is distributed between the ground side and the structure side. A large-amplitude damping damper that functions to calm down the rolls and a small amplitude that is arranged between the ground side and the structure side and functions to calm the rolls that have a small amplitude in the structure. Seismic isolation structure characterized by having a damping damper While the large-amplitude damping damper achieves a predetermined damping action when expanding and contracting in the piston speed range where the low-speed or more is low, the small-amplitude damping damper is expanding and contracting in the piston speed range where the low-speed to low-speed piston The seismic isolation structure according to claim 1, which is set so as to realize a predetermined damping action. The large amplitude damping damper has one end connected to the structure and the other end connected to the ground, while the small amplitude damping damper has one end connected to the structure and the other end connected to the seismic isolation bearing. Seismic isolation structure according to item 1 The seismic isolation structure according to claim 3, wherein the seismic isolation bearing for connecting the small-amplitude damping damper comprises an elastic rolling bearing or an elastic sliding bearing. The seismic isolation structure according to claim 4, wherein the elastic rolling bearing has an elastic portion connected to the structure and a rolling portion distributed on the ground side. The seismic isolation structure according to claim 4, wherein the elastic sliding bearing has an elastic part connected to the structure and a sliding part distributed on the ground side.

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