JP2010255767A - Three-dimensional base isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-dimensional base isolation device which prevents bending moment from acting on a liquid pressure cylinder, makes it hard for laminated rubber to cause shear buckling, and improves base-isolation performance. <P>SOLUTION: A plurality of liquid pressure cylinders 3 are arranged for a piece of the laminated rubber 1 so as to become symmetrical with respect to the axis O as the center. A vertical load support liquid chamber 3c, which is connected to an accumulator 2, and an upper liquid chamber 3e for bending support and a lower liquid chamber 3f for bending support, which are divided by a piston 3d, are formed in each liquid pressure cylinder 3. The upper liquid chamber 3e for bending support of the liquid pressure cylinder 3 and the lower liquid chamber 3f for bending support of another liquid pressure cylinder 3 corresponding to the liquid pressure cylinder 3 are connected by a communication passage 7a. The lower liquid chamber 3f for bending support of the liquid pressure cylinder 3 and the upper liquid chamber 3e for bending support of another liquid pressure cylinder 3 corresponding to the liquid pressure cylinder 3 are connected by a communication passage 7b. Thereby each liquid pressure cylinder 3 is structured to operate in the same phase. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a three-dimensional seismic isolation device.

  Conventionally, three-dimensional seismic isolation devices using various springs have been proposed in order to protect and support seismic isolation objects such as buildings and heavy buildings from earthquake vibrations and shocks.

  FIG. 6 is a side sectional view showing an example of a conventional three-dimensional seismic isolation device. The three-dimensional seismic isolation device includes a laminated rubber 1 having a horizontal seismic isolation function and an accumulator 2 connected in a vertical direction. A structure in which a seismic isolation unit 5 in which hydraulic cylinders 3 having a seismic isolation function are stacked up and down via a spherical bearing 4 is disposed at a plurality of required locations between the foundation B and the seismic isolation object H. have.

  The hydraulic cylinder 3 includes a hydraulic cylinder main body 3a and a piston rod 3b that is slidably fitted in the vertical direction inside the hydraulic cylinder main body 3a and has an upper end projecting outside the hydraulic cylinder main body 3a. On the other hand, the accumulator 2 has an accumulator body 2a and a piston 2b fitted into the accumulator body 2a so as to be slidable in the vertical direction, and is a lower space of the accumulator body 2a partitioned by the piston 2b. 2c and a vertical load supporting liquid chamber 3c formed on the lower surface side of the piston rod 3b inside the hydraulic cylinder main body 3a are connected by a communication pipe 6, and the accumulator main body 2a connected by the communication pipe 6 is connected. The lower space 2c and the fluid chamber 3c for supporting the vertical load of the hydraulic cylinder body 3a are filled with a liquid such as oil, and the fluid is partitioned by the piston 2b. The Yumureta body 2a upper space 2d of are to be filled with an inert gas such as nitrogen gas.

  Here, as described above, the laminated rubber 1 and the hydraulic cylinder 3 are stacked one above the other via the spherical bearing 4 to constitute the seismic isolation unit 5. This is to prevent the “bending moment” from acting.

  For example, Patent Document 1 shows a general technical level related to a three-dimensional seismic isolation device including a laminated rubber and a hydraulic cylinder.

JP 2008-291918 A

  By the way, when the laminated rubber 1 is considered by itself, the rotation of one end is not restricted by providing the spherical bearing 4 as shown in FIG. Instead, as shown in FIG. 7 (b), it is desirable to use both ends fixed with bending (rotation) constrained.

  This is because, as shown in FIG. 7B, when the laminated rubber 1 is used with both ends fixed and the bending (rotation) is constrained, the stability limit horizontal displacement of the laminated rubber 1 (horizontal when buckling occurs) 7 (c), as shown by the phantom line, the spherical rubber 4 is provided as shown in FIG. 7 (a) to make the laminated rubber 1 free to rotate at one end. The stability limit horizontal displacement of the laminated rubber 1 is as shown by a solid line in FIG. 7C. For example, when the vertical load is P = 20 [ton], the stability limit horizontal displacement is approximately when the both ends are fixed. In contrast to 1250 [mm], the stability limit horizontal displacement is reduced to about 1000 [mm] when one-end rotation is free, and buckling occurs with a small horizontal displacement even with the same vertical load.

  Further, as shown in FIG. 7B, when the laminated rubber 1 is used with both ends fixed and the bending (rotation) is constrained, the horizontal rigidity of the laminated rubber 1 (the horizontal load is F and the horizontal displacement is δ). Then, F / δ [ton / m]) is indicated by an imaginary line in FIG. 7D, whereas a spherical bearing 4 is provided as shown in FIG. When the rubber 1 is rotated free at one end, the horizontal rigidity of the laminated rubber 1 is as shown by a solid line in FIG. 7 (d), and the rate at which the horizontal rigidity decreases as the vertical load increases is fixed at both ends. It can be seen that the one-end rotation free becomes larger, and in the case of the one-end rotation free, the laminated rubber 1 is likely to cause shear buckling.

  That is, as shown in FIG. 8A, if the laminated rubber 1 and the hydraulic cylinder 3 are stacked up and down via the spherical bearing 4 to form the seismic isolation unit 5, the bending moment with respect to the hydraulic cylinder 3 is achieved. On the other hand, a bending moment is applied to the laminated rubber 1 and the laminated rubber 1 is liable to cause shear buckling. On the other hand, if the spherical rubber 4 is not interposed, FIG. If the laminated rubber 1 and the hydraulic cylinder 3 are directly connected to each other as shown in FIG. 4, it is advantageous for the laminated rubber 1, but the hydraulic cylinder 3 has to bear a bending moment and slide resistance. As a result, there will be a problem that the seismic isolation performance decreases.

  In view of such circumstances, the present invention is capable of preventing a bending moment from acting on a hydraulic cylinder, making it difficult for a laminated rubber to cause shear buckling, and improving a base isolation performance. The device is to be provided.

The present invention is a tertiary equipped with a seismic isolation unit in which a laminated rubber having a horizontal seismic isolation function and a hydraulic cylinder having an accumulator connected thereto and having a vertical seismic isolation function are stacked vertically via a spherical bearing. In the former seismic isolation device,
For one laminated rubber constituting the seismic isolation unit, a plurality of hydraulic cylinders are arranged so as to be symmetric about the axis of the laminated rubber,
In each of the hydraulic cylinders, a vertical load supporting liquid chamber connected to the accumulator, a bending supporting upper liquid chamber and a bending supporting lower liquid chamber partitioned vertically by a piston are formed.
The upper hydraulic chamber for bending support of the hydraulic cylinder and the lower hydraulic chamber for bending support of another hydraulic cylinder corresponding to the hydraulic cylinder are connected by a communication path, and the lower bending chamber of the hydraulic cylinder is supported for bending. By connecting the fluid chamber and the upper fluid chamber for bending support of another fluid pressure cylinder corresponding to the fluid pressure cylinder by a communication path, the fluid pressure cylinders are configured to operate in the same phase. It is applied to the three-dimensional seismic isolation device.

  According to the above means, the following operation can be obtained.

  When a bending moment is transmitted to the hydraulic cylinder of the seismic isolation unit in the event of an earthquake or the like, an upward load acts on one of the hydraulic cylinders arranged symmetrically about the axis of the laminated rubber. A downward load is applied to the corresponding other hydraulic cylinder, but these hydraulic cylinders are only allowed to operate in the same phase by the connection through the communication path, so that no rotational deformation occurs.

  As a result, the laminated rubber has a spherical bearing between the hydraulic cylinder and is used in a state in which bending (rotation) is constrained as fixed at both ends. It becomes difficult to cause shear buckling.

  The laminated rubber and the plurality of hydraulic cylinders are connected via spherical bearings, and each hydraulic cylinder need not bear a bending moment. There is no problem that the performance deteriorates.

  In the three-dimensional seismic isolation device, a hydraulic cylinder is disposed at a position that is the apex of an even regular polygon that is equal to or larger than a square centered on the axis of the laminated rubber, and one hydraulic cylinder that is located diagonally to each other. The upper liquid chamber for bending support and the lower liquid chamber for bending support of the other hydraulic cylinder are connected by a communication path, and the lower liquid chamber for bending support of one hydraulic cylinder and the bending support of the other hydraulic cylinder are supported. The upper liquid chamber can be connected by a communication path.

  Further, in the three-dimensional seismic isolation device, a hydraulic cylinder is disposed at the apex of a regular polygon of three or more regular shapes centered on the axis of the laminated rubber, for bending support of a desired hydraulic cylinder. The upper liquid chamber and the lower liquid chamber for bending support of the hydraulic cylinder adjacent to one side are sequentially connected by a communication path, and finally the bending of the hydraulic cylinder adjacent to the other side of the desired hydraulic cylinder is made. The upper liquid chamber for support and the lower liquid chamber for bending support of the desired hydraulic cylinder can be connected by a communication path.

  According to the three-dimensional seismic isolation device of the present invention, it is possible to prevent the bending moment from acting on the hydraulic cylinder and to make the laminated rubber difficult to cause shear buckling, and to improve seismic isolation performance. The effects can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows the 1st Example of this invention, Comprising: (a) is side sectional drawing (Ia-Ia cross-section equivalent figure of (b)), (b) is a plane sectional drawing. It is a schematic block diagram which shows the 2nd Example of this invention, Comprising: (a) is a sectional side view (corresponding to IIa-IIa cross section of (b)), (b) is a plane sectional view. It is a schematic block diagram which shows the 3rd Example of this invention, Comprising: (a) is a sectional side view (IIIa-IIIa equivalent view of (b)), (b) is a plane sectional view. It is a schematic block diagram which shows 4th Example of this invention, Comprising: (a) is a sectional side view (IVa-IVa cross-section equivalent figure of (b)), (b) is a plane sectional view. It is a schematic block diagram which shows the 5th Example of this invention, Comprising: (a) is a sectional side view (corresponding to Va-Va section of (b)), (b) is a plane sectional view. It is a sectional side view which shows an example of the conventional three-dimensional seismic isolation apparatus. It is a figure which shows the state change by the difference in the fixing conditions of laminated rubber (the presence or absence of a spherical bearing) in an example of the conventional three-dimensional seismic isolation device, and (a) is when one end rotation is free (when there is a spherical bearing) (B) is a conceptual diagram showing the deformation of the laminated rubber when both ends are fixed (when there is no spherical bearing), (c) is the laminated rubber when one end rotation is free A diagram showing that the stability limit horizontal displacement is lower than when both ends are fixed, and (d) is a diagram showing that the horizontal rigidity of the laminated rubber is lower than when both ends are fixed. is there. It is a figure which shows the state change by the difference (fixed presence or absence of a spherical bearing) of the lamination | stacking rubber | gum fixed conditions in an example of the conventional three-dimensional seismic isolation apparatus, Comprising: (a) The conceptual diagram which shows the bending moment which acts on laminated rubber, (b) is a conceptual diagram which shows the deformation | transformation of laminated rubber at the time of fixing both ends, and the bending moment which acts on a hydraulic cylinder.

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

  1 (a) and 1 (b) show a first embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 6 denote the same components, and the basic configuration is shown in FIG. Although it is the same as that of the conventional one shown, the feature of the first embodiment is that, as shown in FIGS. 1 (a) and 1 (b), for one laminated rubber 1 constituting the seismic isolation unit 5, A plurality of hydraulic cylinders 3 are arranged so as to be symmetric about the axis O of the laminated rubber 1, and each hydraulic cylinder 3 includes a vertical load supporting liquid chamber 3c connected to the accumulator 2, and a piston 3d. The bending support upper liquid chamber 3e and the bending support lower liquid chamber 3f are formed in the upper and lower portions of the hydraulic cylinder 3, and the bending support upper liquid chamber 3e and the hydraulic cylinder 3 are separated from each other. The lower hydraulic chamber 3f for bending support of the hydraulic cylinder 3 is connected by a communication passage 7a, and the hydraulic cylinder 3 is connected to the lower liquid chamber 3f for bending support and the upper liquid chamber 3e for bending support of another hydraulic cylinder 3 corresponding to the hydraulic cylinder 3 through the communication path 7b. Are configured to operate in the same phase.

  In the case of the first embodiment, four hydraulic cylinders 3 are arranged at positions that are the apexes of a square centered on the axis O of the laminated rubber 1, and one hydraulic cylinder 3 that is located diagonally to each other. The upper liquid chamber 3e for bending support and the lower liquid chamber 3f for bending support of the other hydraulic cylinder 3 are connected by a communication path 7a, and the lower liquid chamber 3f for bending support of one hydraulic cylinder 3 and the other liquid chamber 3f of the other hydraulic cylinder 3 are connected. The upper liquid chamber 3e for bending support of the hydraulic cylinder 3 is connected by a communication path 7b.

  The four hydraulic cylinders 3 use one common hydraulic cylinder body 3a, and four piston rods 3b are arranged on the single hydraulic cylinder body 3a.

  Further, the four vertical load supporting liquid chambers 3c formed on the lower surface side of the four piston rods 3b are communicated with each other through the communication passage 8.

  Next, the operation of the first embodiment will be described.

  When a bending moment is transmitted to each hydraulic cylinder 3 of the seismic isolation unit 5 in the event of an earthquake or the like, one hydraulic cylinder 3 disposed diagonally with respect to the axis O of the laminated rubber 1 is symmetrical. An upward load acts on the other hydraulic cylinder 3 and a downward load acts on the corresponding other hydraulic cylinder 3, but these hydraulic cylinders 3 can only operate in phase due to the connection through the communication paths 7a and 7b. Since it is not allowed, no rotational deformation occurs.

  As a result, the laminated rubber 1 is used in a state in which bending (rotation) is constrained as being fixed at both ends, although the spherical bearing 4 is interposed between the laminated rubber 1 and the hydraulic cylinder 3. The laminated rubber 1 is less likely to cause shear buckling. Incidentally, the stability limit horizontal displacement (horizontal displacement at the time of occurrence of buckling) of the laminated rubber 1 in the first embodiment is restrained from bending (rotating) with the laminated rubber 1 fixed at both ends as shown in FIG. 7B. As shown in FIG. 7 (c), the horizontal rigidity of the laminated rubber 1 in the first embodiment is the same as that shown in FIG. 7 (b). Similar to the case where the rubber 1 is used with both ends fixed and the bending (rotation) is constrained, it is indicated by a virtual line in FIG.

  The laminated rubber 1 and a plurality of (four) hydraulic cylinders 3 are connected via spherical bearings 4, and each hydraulic cylinder 3 does not have to bear a bending moment, so that sliding resistance is eliminated. There is no worry that the seismic isolation performance will deteriorate.

  In this way, it is possible to prevent the bending moment from acting on the hydraulic cylinder 3 and to make the laminated rubber 1 less likely to cause shear buckling, thereby improving seismic isolation performance.

  2 (a) and 2 (b) show a second embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 1 (a) and 1 (b) denote the same items. The general configuration is the same as that of the first embodiment shown in FIGS. 1A and 1B, but the feature of the second embodiment is as shown in FIGS. 2A and 2B. Six hydraulic cylinders 3 are arranged at the apex of a regular hexagon centering on the axis O of the laminated rubber 1, and the upper liquid chamber for bending support of one hydraulic cylinder 3 located diagonally to each other. 3e and the lower liquid chamber 3f for bending support of the other hydraulic cylinder 3 are connected by a communication path 7a, and the lower liquid chamber 3f for bending support of one hydraulic cylinder 3 and the bending support of the other hydraulic cylinder 3 are supported. The upper liquid chamber 3e is connected by the communication path 7b.

  Even if six hydraulic cylinders 3 are arranged as in the second embodiment, if the bending moment is transmitted to each hydraulic cylinder 3 of the seismic isolation unit 5 when an earthquake or the like occurs, the axis of the laminated rubber 1 An upward load acts on one of the hydraulic cylinders 3 arranged diagonally so as to be symmetric with respect to O, and a downward load acts on the corresponding other hydraulic cylinder 3. However, since these hydraulic cylinders 3 are only allowed to operate in the same phase by the connection through the communication passages 7 a and 7 b, no rotational deformation occurs. As a result, the laminated rubber 1 is connected to the hydraulic cylinder 3. Although the spherical bearing 4 is interposed between the two, the laminated rubber 1 is less likely to cause shear buckling, as if it is used in a state in which bending (rotation) is constrained as fixed at both ends. Laminated rubber 1 and multiple (six) liquids The cylinder 3 is connected via a spherical bearing 4, and the hydraulic cylinders 3 do not have to bear a bending moment. Therefore, there is no concern about an increase in sliding resistance, and the seismic isolation performance deteriorates. Does not occur. Incidentally, the stability limit horizontal displacement (horizontal displacement at the time of occurrence of buckling) of the laminated rubber 1 in the second embodiment is restrained from bending (rotating) with the laminated rubber 1 fixed at both ends as shown in FIG. As shown in FIG. 7 (c), the horizontal rigidity of the laminated rubber 1 in the second embodiment is the same as that shown in FIG. 7 (b). Similar to the case where the rubber 1 is used with both ends fixed and the bending (rotation) is constrained, it is indicated by a virtual line in FIG.

  Thus, also in the second embodiment, as in the first embodiment, it is possible to prevent the bending moment from acting on the hydraulic cylinder 3, and to make the laminated rubber 1 less likely to cause shear buckling, and the seismic isolation performance. Improvements can be made.

  3 (a) and 3 (b) show a third embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 2 (a) and 2 (b) denote the same components. The general configuration is the same as that of the second embodiment shown in FIGS. 2A and 2B, but the feature of the third embodiment is as shown in FIGS. 3A and 3B. In the central portion of the laminated rubber 1 on the extension of the axis O, a hydraulic cylinder 3 dedicated to supporting a vertical load is disposed via a spherical bearing 4, and six hydraulic cylinders 3 dedicated to supporting the vertical load are disposed around the hydraulic cylinder 3. The upper hydraulic chamber 3e for bending support of one hydraulic cylinder 3 and the lower liquid chamber 3f for bending support of the other hydraulic cylinder 3 are hydraulically arranged. It is connected by a communication path 7a formed by piping provided outside the cylinder body 3a, and is used for bending support of one hydraulic cylinder 3. A chamber 3f and the other bending support for the upper liquid chamber 3e of the hydraulic cylinder 3 is in that so as to connect the communication path 7b formed by a pipe which is provided on the outside of the hydraulic cylinder body 3a.

  When configured as in the third embodiment, the vertical load is mainly supported by the hydraulic cylinder 3 dedicated to supporting the vertical load disposed in the center portion on the extension of the axis O of the laminated rubber 1. Thus, when a bending moment is transmitted to each hydraulic cylinder 3 of the seismic isolation unit 5 in the event of an earthquake or the like, one of the liquids arranged diagonally to be symmetrical about the axis O of the laminated rubber 1 An upward load is applied to the pressure cylinder 3 and a downward load is applied to the corresponding other hydraulic cylinder 3. These hydraulic cylinders 3 are provided outside the hydraulic cylinder body 3a. Since only the operation in the same phase is allowed by the connection by the communication passages 7 a and 7 b formed by the pipe formed, no rotational deformation occurs, and as a result, the laminated rubber 1 has a spherical bearing 4 between the hydraulic cylinder 3. Intervened However, the laminated rubber 1 is used in a state in which bending (rotation) is constrained as being fixed at both ends, and the laminated rubber 1 is less prone to shear buckling, and the laminated rubber 1 and the vertical load The supporting hydraulic cylinders 3 and a plurality (six) of hydraulic cylinders 3 are connected via spherical bearings 4, and each hydraulic cylinder 3 does not have to bear a bending moment, so that sliding There is no worry that the resistance will increase, and there will be no problem that the seismic isolation performance will deteriorate. Incidentally, the stability limit horizontal displacement (horizontal displacement at the time of occurrence of buckling) of the laminated rubber 1 in the third embodiment is restrained from bending (rotating) with the laminated rubber 1 fixed at both ends as shown in FIG. 7B. As shown in FIG. 7 (c), the horizontal rigidity of the laminated rubber 1 in the third embodiment is the same as that shown in FIG. 7 (b). Similar to the case where the rubber 1 is used with both ends fixed and the bending (rotation) is constrained, it is indicated by a virtual line in FIG.

  Thus, in the third embodiment as well, as in the second embodiment, it is possible to prevent the bending moment from acting on the hydraulic cylinder 3, and to make the laminated rubber 1 less likely to cause shear buckling, and the seismic isolation performance. Improvements can be made.

  4 (a) and 4 (b) show a fourth embodiment of the present invention. In the figure, the parts denoted by the same reference numerals as those in FIGS. 1 (a) and 1 (b) represent the same items. The general configuration is the same as that of the first embodiment shown in FIGS. 1A and 1B, but the feature of the fourth embodiment is as shown in FIGS. 4A and 4B. The accumulator 2 is connected to each of the four hydraulic cylinders 3 disposed at the apexes of the square centering on the axis O of the laminated rubber 1 through the communication pipe 6.

  When configured as in the fourth embodiment, when a bending moment is transmitted to each hydraulic cylinder 3 of the seismic isolation unit 5 in the event of an earthquake or the like, they are diagonal to each other so as to be symmetrical about the axis O of the laminated rubber 1. An upward load acts on one of the hydraulic cylinders 3 disposed at the same time, and a downward load acts on the corresponding other hydraulic cylinder 3, but these hydraulic cylinders 3 are connected to each other. Since only the operation in the same phase is allowed by the connection by the passages 7a and 7b, no rotational deformation occurs. As a result, the laminated rubber 1 has the spherical bearing 4 interposed between the laminated cylinder 1 and the hydraulic cylinder 3. The laminated rubber 1 is used in a state in which bending (rotation) is constrained as fixed at both ends, and the laminated rubber 1 is less likely to cause shear buckling, and a plurality (four) of the laminated rubber 1 are used. Hydraulic cylinder 3 is a sphere Since it is connected via the bearing 4 and each hydraulic cylinder 3 does not have to bear a bending moment, there is no concern about an increase in sliding resistance, and there is a problem that the seismic isolation performance deteriorates. Absent. Incidentally, the stability limit horizontal displacement (horizontal displacement at the time of occurrence of buckling) of the laminated rubber 1 in the fourth embodiment is restrained from bending (rotating) with the laminated rubber 1 fixed at both ends as shown in FIG. 7B. As shown in FIG. 7 (c), the horizontal rigidity of the laminated rubber 1 in the fourth embodiment is the same as that shown in FIG. 7 (b). Similar to the case where the rubber 1 is used with both ends fixed and the bending (rotation) is constrained, it is indicated by a virtual line in FIG.

  Furthermore, although the number of the accumulators 2 increases, it is possible to reduce the number of the accumulators 2 and to make the accumulator 2 easier to manufacture, and there is another piping or equipment around the place where the seismic isolation unit 5 is installed. In this case, it is also effective in avoiding interference with them.

  Thus, also in the fourth embodiment, as in the first embodiment, it is possible to prevent the bending moment from acting on the hydraulic cylinder 3, and to make the laminated rubber 1 less likely to cause shear buckling, and the seismic isolation performance. Improvements can be made.

  In the case of the first embodiment to the fourth embodiment, four hydraulic cylinders 3 are disposed at the position of the square apex centered on the axis O of the laminated rubber 1, or the laminated rubber 1 Instead of six hydraulic cylinders 3 being arranged at the apex of a regular hexagon centered on the axis O, an even regular polygon (regular octagon or regular square) centered on the axis O of the laminated rubber 1 is used. It is also possible to arrange a plurality of hydraulic cylinders 3 at positions that are the vertices of a decagon or higher.

  FIGS. 5 (a) and 5 (b) show a fifth embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 3 (a) and 3 (b) denote the same items. The general configuration is the same as that of the third embodiment shown in FIGS. 3A and 3B, but the feature of the fifth embodiment is as shown in FIGS. 5A and 5B. In the central portion of the laminated rubber 1 on the extension of the axis O, a hydraulic cylinder 3 dedicated to supporting a vertical load is disposed via a spherical bearing 4, and six hydraulic cylinders 3 dedicated to supporting the vertical load are disposed around the hydraulic cylinder 3. Of the hydraulic cylinder 3 adjacent to the upper liquid chamber 3e for bending support of the desired hydraulic cylinder 3 and one side (the clockwise direction in FIG. 5B). The bending support lower liquid chamber 3f is sequentially connected by a communication path 7 formed by piping provided outside the hydraulic cylinder body 3a, and finally The upper fluid chamber 3e for bending support of the hydraulic cylinder 3 adjacent to the other side of the desired hydraulic cylinder 3 (the counterclockwise direction in FIG. 5B) and the desired hydraulic cylinder 3 The bending support lower liquid chamber 3f is connected by a communication passage 7 formed by a pipe provided outside the hydraulic cylinder body 3a.

  When configured as in the fifth embodiment, the vertical load is mainly supported by the hydraulic cylinder 3 dedicated to supporting the vertical load disposed in the center portion on the extension of the axis O of the laminated rubber 1, and in this state. Thus, when a bending moment is transmitted to each hydraulic cylinder 3 of the seismic isolation unit 5 in the event of an earthquake or the like, one of the liquids arranged diagonally to be symmetrical about the axis O of the laminated rubber 1 An upward load is applied to the pressure cylinder 3 and a downward load is applied to the corresponding other hydraulic cylinder 3, but the upper fluid chamber 3e for supporting the bending of the desired hydraulic cylinder 3 and one of the hydraulic cylinders 3e. A communication passage 7 formed by a pipe provided outside the hydraulic cylinder body 3a and the lower liquid chamber 3f for bending support of the hydraulic cylinder 3 adjacent to the side (the clockwise direction in FIG. 5B). Connected in sequence by and finally before The upper hydraulic chamber 3e for bending support of the hydraulic cylinder 3 adjacent to the other side of the desired hydraulic cylinder 3 (the counterclockwise direction in FIG. 5B) and the bending of the desired hydraulic cylinder 3 Since the supporting lower liquid chamber 3f is connected by a communication path 7 formed by piping provided outside the hydraulic cylinder body 3a, it is arranged around the hydraulic cylinder 3 dedicated to supporting the vertical load. Since the six hydraulic cylinders 3 are allowed to operate only in the same phase, rotational deformation does not occur. As a result, the laminated rubber 1 has a spherical bearing 4 interposed between the laminated cylinders 1 and 3. However, the laminated rubber 1 is less likely to cause shear buckling as if the bending (rotation) is restricted as both ends are fixed, and the laminated rubber 1 and the laminated rubber 1 are not vertically bent. Hydraulic pressure cylinder dedicated to load support 3 and a plurality (six) of hydraulic cylinders 3 are connected via a spherical bearing 4, and each of the hydraulic cylinders 3 does not have to bear a bending moment, so there is no fear of increasing sliding resistance. There is no problem that the seismic isolation performance deteriorates. Incidentally, the stability limit horizontal displacement (horizontal displacement at the time of occurrence of buckling) of the laminated rubber 1 in the fifth embodiment was restrained from bending (rotating) with the laminated rubber 1 fixed at both ends as shown in FIG. 7B. As shown in FIG. 7 (c), the horizontal rigidity of the laminated rubber 1 in the fifth embodiment is the same as that shown in FIG. 7 (b). Similar to the case where the rubber 1 is used with both ends fixed and the bending (rotation) is constrained, it is indicated by a virtual line in FIG.

  In the case of the fifth embodiment, instead of arranging the six hydraulic cylinders 3 at the positions of the regular hexagons centered on the axis O of the laminated rubber 1, the axis O of the laminated rubber 1 is centered. It is also possible to arrange a plurality of hydraulic cylinders 3 at positions that are the vertices of a regular triangle or a regular polygon (square, regular pentagon, or more).

  Thus, in the fifth embodiment as well, as in the third embodiment, it is possible to prevent the bending moment from acting on the hydraulic cylinder 3, and to make the laminated rubber 1 less likely to cause shear buckling, and the seismic isolation performance. Improvements can be made.

  Note that the three-dimensional seismic isolation device of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Laminated rubber 2 Accumulator 3 Hydraulic cylinder 3c Liquid chamber for vertical load support 3d Piston 3e Upper liquid chamber for bending support 3f Lower liquid chamber for bending support 4 Spherical bearing 5 Seismic isolation unit 7 Communication path 7a Communication path 7b Communication path B Foundation H Seismic isolation object O Axis

Claims (3)

A three-dimensional seismic isolation device having a base isolation unit in which a laminated rubber having a horizontal isolation function and a hydraulic cylinder connected to an accumulator and having a vertical isolation function are stacked vertically via spherical bearings. In
For one laminated rubber constituting the seismic isolation unit, a plurality of hydraulic cylinders are arranged so as to be symmetric about the axis of the laminated rubber,
In each of the hydraulic cylinders, a vertical load supporting liquid chamber connected to the accumulator, a bending supporting upper liquid chamber and a bending supporting lower liquid chamber partitioned vertically by a piston are formed.
The upper hydraulic chamber for bending support of the hydraulic cylinder and the lower hydraulic chamber for bending support of another hydraulic cylinder corresponding to the hydraulic cylinder are connected by a communication path, and the lower bending chamber of the hydraulic cylinder is supported for bending. By connecting the fluid chamber and the upper fluid chamber for bending support of another fluid pressure cylinder corresponding to the fluid pressure cylinder by a communication path, the fluid pressure cylinders are configured to operate in the same phase. A three-dimensional seismic isolation device.   A hydraulic cylinder is arranged at the apex of an even regular polygon that is equal to or more than a square centered on the axis of the laminated rubber, and the upper liquid chamber for bending support and the other of the one hydraulic cylinder located diagonally to each other The lower hydraulic chamber for bending support of one hydraulic cylinder is connected by a communication path, and the lower liquid chamber for bending support of one hydraulic cylinder and the upper liquid chamber for bending support of the other hydraulic cylinder are connected by a communication path. The three-dimensional seismic isolation device according to claim 1 connected.   A hydraulic cylinder is disposed at the apex of a regular polygon of a regular trigonal shape or more centered on the axis of the laminated rubber, and a liquid fluid adjacent to one side of the upper fluid chamber for bending support of the desired hydraulic cylinder. The lower fluid chamber for bending support of the pressure cylinder is sequentially connected by a communication path, and finally the upper fluid chamber for bending support of the hydraulic cylinder adjacent to the other side of the desired hydraulic cylinder and the desired hydraulic pressure The three-dimensional seismic isolation device according to claim 1, wherein the lower liquid chamber for bending support of the cylinder is connected by a communication path.

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