JPH0434188A - Three dimensional earthquake isolation system - Google Patents

Abstract

PURPOSE:To restrain a rocking vibration by providing a dead load support means movable in a horizontal direction, and three dimensional base isolation element laid in series with the aforesaid support means for damping a vertical vibration, respectively between a foundation and an earthquake isolation floor. CONSTITUTION:An earthquake isolation floor 22 equipped with a computer 21 is supported on a rack 20 via a plurality of pedestals 23, and three dimensional base isolation element 24 comprising dead load support means 25 and 26, and a rotation restraining means 27 is installed between the earthquake isolation floor 22 and the foundation 2. Then, a support seat 32 movable in a horizontal and two dimensional direction via a ball bearing member 31 is provided on a base 3 fixed to the foundation 2. Also, a single parallel link mechanism 34 is provided between the support seat 32 and the mounting member 33 of the rack 20. Furthermore, both ends of two link members 35 are so supported on the support seat 32 and mounting member 33 as to be freely rotatable. The rack 20 even when moved vertically can be always kept horizontal. According to the aforesaid construction, a damping effect can be enhanced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a seismic isolation system for a so-called three-dimensional seismic isolation floor, which is seismically isolated and supported in the horizontal and vertical directions. The present invention relates to a three-dimensional seismic isolation system suitable for suppressing rotational vibration (hereinafter referred to as rocking vibration).

[Conventional technology]

Conventional three-dimensional seismic isolation systems, for example,
As described in Japanese Patent No. 4334, and the main part of its structure is shown in FIG. A self-weight supporting means 6 is installed which is supported by a spring member 5 and seismically isolated horizontally in two dimensions by a spring member 5, and the self-weight supporting means 6 and a seismically isolated body (not shown) above it are mounted. A structure is proposed that is composed of a spring member 8 that provides seismic isolation in the vertical direction, and an inner cylindrical member 9 and an outer cylindrical member 10 that move in the vertical direction with a gap between them and a pedestal 7 that corresponds to a seismic isolation floor. has been done.

It is also described in, for example, Japanese Unexamined Patent Publication No. 59-47543.

As the main part of its configuration is shown in FIG. 14, a base 3 is fixed on a foundation 2, and an x-Y stage 1
1 is installed. The X-Y stage 11 is a lower stage 11. The lower stage lla is supported on a base 3 so as to be movable in the left-right direction in the figure, and is seismically isolated in the horizontal left-right direction by a spring member 12. The upper stage llb is the lower stage 11. It is supported at the top so as to be movable in the front-rear direction with respect to the figure, and is seismically isolated in the horizontal front-rear direction by a spring member (not shown). The upper stage Ilb and the pedestal 7 on which the seismically isolated body (not shown) is mounted are comprised of a spring member 8 for seismic isolation in the vertical direction and a double parallel link means 13 for preventing rocking vibration. Something has been proposed.

Furthermore, for example, published by Nikkan Kogyo Shimbun, “Atomic Crab Industry No. 34”
Described in Volume 12, “Seismic Isolation Structures in Nuclear Facilities”,
As shown in FIG. 15, the main part of the structure is such that a base 3 is fixed on a foundation 2, is supported on the base 3 so as to be movable in two horizontal directions, and is moved horizontally in two dimensions by a spring member 4. A two-dimensional seismic isolation means 14 is installed, and a pedestal 15 on which a seismically isolated body (not shown) is mounted is installed on the two-dimensional seismic isolation means 14. A hanging frame 16 is installed so as to form a recess in one part of the pedestal 15. The hanging frame 16 includes a spring member 8 for seismic isolation in the vertical direction, and a double spring member 8 for preventing rocking vibration. Partial support frame 1 supported by parallel link means 13 and on which a part of the seismically isolated body is mounted
7 is introduced. Reference numeral 18 in the figure is a member for enabling the partial support frame 17 to move in two horizontal directions in the vertical direction pressed by the hanging frame 16.

[Problem to be solved by the invention]

In the conventional technology shown in Fig. 13 above, no consideration is given to rocking vibration, and when rocking vibration occurs during an earthquake, the inner cylinder member and the outer cylinder member come into contact with each other, impairing the seismic isolation performance. There was a problem.

Furthermore, in the prior art shown in FIG. 14 above,
Since the stage supports the weight of the seismically isolated body, it is necessary to increase the rigidity of the entire x-y stage, which poses a problem in that the height from the foundation to the top surface of the pedestal increases.

Furthermore, in the prior art shown in FIG. 15 above, in order to lower the position of the partial support pedestal that constitutes the partial three-dimensional seismic isolation floor, it is installed on the suspension frame below the pedestal, so the suspension frame There was a problem in that there was a limit to increasing the rigidity of the bottom, making it difficult to form a three-dimensional seismic isolation floor arbitrarily wide.

The purpose of the present invention is to provide a three-dimensional seismic isolation system that seismically isolates the entire floor horizontally and vertically, suppresses rocking vibrations, and makes it possible to increase the floor area and lower the distance from the foundation to the floor surface. It is about providing.

[Means to solve the problem]

In order to achieve the above object, the present invention includes horizontally movable self-weight supporting means between the foundation and the seismic isolation floor, arranged in series with the self-weight supporting means, and seismically isolated in the vertical direction. In a three-dimensional seismic isolation system provided with an elastic member, the self-weight supporting means between the foundation and the seismic isolation floor are arranged independently and in parallel, and are movable horizontally to the foundation. A rotation suppressing means is provided which includes a supported supporting means and a parallel link mechanism between the supporting means and the seismic isolation floor.

In addition, in order to suppress rocking vibration of the seismic isolation floor, the parallel link mechanism has a plurality of parallel link sets, each consisting of a plurality of link members whose parallel link surfaces are arranged parallel to each other, on the same support base. be.

In addition, in order to simultaneously suppress the rocking vibration of the seismic isolation floor around two orthogonal axes parallel to the foundation surface, the parallel link mechanism connects each parallel link group consisting of a plurality of link members arranged parallel to each other on the parallel link surface. The parallel link surfaces are arranged at right angles to each other.

Further, the parallel link mechanism has a plurality of link members forming a parallelogram by connecting the ends of each link member to a seismic isolation floor and a support base with pins.

In addition, in order to prevent the support platform from moving horizontally due to an earthquake in the vertical direction, the parallel link mechanism connects the ends of each link member to the seismic isolation floor and the support platform with pins, and connects multiple link members to the base with pins. The link member is composed of a plurality of sets of parallelograms that share one side.

In addition, in order to simultaneously suppress the rocking vibration of the seismic isolation floor around two orthogonal axes parallel to the foundation surface, and to prevent the support platform from moving in the horizontal direction due to an earthquake in the vertical direction, the parallel link mechanism is , the ends of each link member are connected to the seismic isolation floor and support base with pins, and multiple link members are connected to one
It is composed of multiple sets of parallelograms that share sides also in the right angle direction.

Further, in order to suppress torsional vibration of the seismic isolation floor, the support stand is constituted by an X-Y stage consisting of a plurality of support stands that move in directions perpendicular to each other in the horizontal direction.

Further, the rotation suppressing means restrains horizontal relative displacement between the seismic isolation floor and the support base, and reduces the horizontal response of the seismic isolation system to the horizontal seismic force of the seismic isolation floor. Horizontal relative displacement restraining means is provided between the seismic isolation floor and the support base.

Further, the horizontal relative displacement restraining means includes a rond member and a member that supports the rond member so as to be movable only in the vertical direction, between the seismic isolation floor, the seismic isolation force, and the support base. be.

Further, the horizontal relative displacement restraining means is constituted by a plurality of wire members arranged radially in a horizontal plane between the seismic isolation floor and the support base.

In addition, in order to reduce the horizontal response of the base isolation system to the horizontal seismic force of the base isolation floor, the rotation suppressing means includes a resistance plate supported on the lower surface of the support base in parallel with the foundation surface, and A viscous damper is provided in which a viscous material is stored in a container supported by a viscous material such that the resistance plate is immersed therein.

Further, in order to reduce the horizontal response of the base isolation system to the seismic force in the horizontal direction of the base isolation floor, the viscous damper is provided between the supports of the X-Y stage and between the supports and the foundation surface. It is.

In addition, in order to prevent the support platform from floating during an earthquake,
The rotation suppressing means is provided with a spring member between the seismic isolation floor and the support base to constantly press the support base downward.

[For production]

In the present invention, when a vertical seismic force is applied to the foundation, each link member constituting the parallel link mechanism of the rotation suppressing means freely rotates at the pin part, and the seismic isolation floor, each link member, and the support stand are constructed. Since the opposite sides of the parallelogram are kept parallel, rocking vibrations of the seismic isolation floor are suppressed.

In addition, with the rotation suppressing means using a double parallel link mechanism as the parallel link mechanism, even if frictional force occurs between the horizontally moving member and the foundation, there is no horizontal relative displacement preventing means between the seismic isolation floor and the support base. Since the rotation suppressing means is provided, a stable function can be ensured.

Furthermore, if the support stand floats up during an earthquake, this can be prevented since the support stand is constantly pressed downward by the spring member provided between the seismic isolation floor and the support stand.

In addition, when a horizontal earthquake occurs on the seismic isolation floor, the viscous damper can provide a horizontal damping effect.

〔Example〕

1 and 2 showing one embodiment of the present invention will be described below.

Figure 1 shows a three-dimensional seismic isolation device equipped with a computer;
The figure shows an enlarged view of the rotation suppressing means shown in FIG. 1.

In FIG. 1, reference numeral 20 is a pedestal that supports a seismic isolation floor 22 on which a computer 21 is mounted via a plurality of pedestals 23, and a three-dimensional seismic isolation device 24 is installed between it and the foundation 2. ing. The three-dimensional seismic isolation device! 24 is composed of two self-weight supporting means 25, 26 and a rotation suppressing means 27 installed between them.

Next, the configuration of each of the above-mentioned means 25, 26, and 27 will be explained.

The self-weight supporting means 25 and 26 is provided with a support stand 28 that moves two-dimensionally horizontally on a base 3 fixed to the foundation 2 via a horizontally moving member 4. The support stand 28 is the stand 2
A spring member 8 is provided between the spring member 8 and the cylinder member 29 fixed in the vertical direction for seismic isolation in the vertical direction, and as the spring member 8 moves in the vertical direction, it swings in the horizontal direction.
A plurality of wire members 30 are arranged radially in a horizontal plane between the support base 28 and the pedestal 20 to prevent the spring member 8 from swinging in the horizontal direction. In addition, since the plurality of wire members 30 constitute the support stand 8 and the pedestal 20 as one unit, if an earthquake occurs in the horizontal direction, the support stand 8 and the mount 20 can be placed on the base 3 at the same time. Moving.

At this time, since the spring member 5 is installed horizontally between the pedestal 20 and the foundation 2, the spring member 5 can provide seismic isolation in the horizontal direction. In FIG. 1, only the dead weight supporting means 25 on the left side is installed, but the present invention is not limited to this, and the dead weight supporting means 26 on the right side of the figure may also be installed.

As shown in FIG.
A support stand 32 that moves two-dimensionally horizontally via a ball bearing member 31 is provided on a base 3 fixed to the base 3 , and a mounting member 33 fixed to the lower surface of the support stand 32 and the pedestal 20 is provided.
A single parallel linkage 34 is provided between. The single parallel link mechanism 34 has two link members 35 having the same length and arranged in parallel, both ends of which are rotatably connected to the support base 32 and the mounting member 33 by pins 36. Although not shown, the single parallel link mechanism 34 is also installed in the front-rear direction with respect to the figure.

Therefore, in the rotation suppressing means 27, both ends of the two link members 35 are rotatably supported by the support base 32 and the mounting member 33 by the pins 36, and the two link members 35 are rotatably supported by the support base 32 and the mounting member 33. 33 form a parallelogram, the mounting member 33 fixed to the pedestal 20 and the support base 32 are always held parallel even if the pedestal 20 moves in the vertical direction. Therefore, it is possible to receive seismic forces in the vertical and horizontal directions, and to suppress rocking vibrations about the axis in the longitudinal direction relative to the plane of the paper. Although the rotation suppressing means 27 is not shown, it is also installed to suppress rocking vibrations about the axis in the left-right direction in the figure.

As described above, in the embodiment shown in FIGS. 1 and 2, the three-dimensional seismic isolation device 24, which is constituted by the horizontal movement means 25, self-weight support means 26, and rotation suppressing means 27, is used to The seismic isolation effect of the computer 21 can be improved.

Next, FIG. 3 showing a second embodiment of the rotation suppressing means will be described.

In the embodiment shown in FIG. 3, instead of the single parallel link mechanism 34 in the embodiment shown in FIG. A double parallel link mechanism 37 is formed in which parallelograms are formed in substantially the same plane, and four link members 36, a support base 32, and a mounting member 33 are rotatably connected by pins 36. . In this embodiment, a plurality of sets of the double parallel link mechanisms 37 are installed, similar to the embodiment shown in FIG. 2.

Therefore, in this embodiment, it is possible to eliminate horizontal movement of the support base due to vertical vibrations generated in the foundation 2 by using the double parallel link mechanism 37.

Next, FIG. 4 showing a third embodiment of the rotation suppressing means will be described.

The embodiment shown in FIG. 4 is provided with an X-Y stage 38 in place of the ball bearing in the embodiment shown in FIG. That is, the X-Y stage 38 moves the first moving member 4 along with the first rule member 39 fixed on the base 3.
A second rail member 42 fixed on the intermediate support stand 41 in a direction perpendicular to the first rule member 39 is provided with an intermediate support stand 41 that moves through the middle support stand 41. A support stand 32 is provided which moves by moving.

Therefore, in this embodiment, the X-Y stage 38
, it is possible to suppress torsional vibration of the seismic isolation floor 22 on the pedestal 20.

Next, FIG. 5, which shows a fourth embodiment of the rotation suppressing means, will be described.

In the embodiment shown in FIG. 5, a plurality of sets of double parallel link mechanisms 37 in the embodiment shown in FIG. 3 are provided in directions orthogonal to each other.

Therefore, in this embodiment, rocking vibrations about two axes parallel to and perpendicular to the upper surface of the foundation 2 can be prevented.

Next, FIG. 6, which shows a fifth embodiment of the rotation suppressing means, will be described.

The embodiment shown in FIG. 6 includes a plurality of sets of double parallel link mechanisms 37 shown in FIG. 5 and an X-Y stage 38 shown in FIG.
It is a combination of

Therefore, in this embodiment, it is possible to simultaneously suppress the rocking vibration of the seismic isolation floor on the pedestal 20 about two orthogonal axes parallel to the upper surface of the foundation 2, and to prevent torsional vibration.

Next, FIG. 7 showing a sixth embodiment of the rotation suppressing means will be described.

In the embodiment shown in FIG. 7, in addition to the double parallel link 37 of the embodiment shown in FIG. A horizontal relative displacement restraining means 46 is provided, which is comprised of a freely supporting linear bearing member 45.

Therefore, in this embodiment, the horizontal relative displacement between the pedestal 20 and the support base 32 can be reliably suppressed by the horizontal relative displacement restraining means 46.

Next, FIG. 8 showing a seventh embodiment of the rotation suppressing means will be described.

The embodiment shown in FIG. 8 uses a friction member 49 instead of the ball bearing member 31 of the embodiment shown in FIG. horizontal relative displacement restraining means 48 consisting of a plurality of wire members 47 arranged radially in a horizontal plane;
has been established.

Therefore, this embodiment has the same effect as the embodiment shown in FIG. 7 above.

Next, FIG. 9 showing an eighth embodiment of the rotation suppressing means will be described.

In the embodiment shown in FIG. 9, a resistance plate 50 having a surface parallel to the base 3 is attached to the lower surface of the support base 32 in place of the horizontal relative displacement restraining means 48 of the embodiment shown in FIG. A viscous damper 53 consisting of a container 52 for storing a viscous body 51 is provided so that the resistance plate 50 is immersed therein.

Therefore, in this embodiment, the horizontal response of the seismic isolation system to the horizontal seismic force of the seismic isolation floor on the pedestal 20 can be reduced by the viscous damper 53.

Next, FIG. 10 showing a ninth embodiment of the rotation suppressing means will be described.

The embodiment shown in FIG. 10 is arranged between the support stand 32 and the intermediate support stand 41 of the embodiment shown in FIG.
A viscous damper 53 of the embodiment shown in FIG. 9 is provided between the base 3 and the base 3, respectively.

Therefore, this embodiment has the same effect as the embodiment shown in FIG. , a damping effect in the vertical direction can be obtained.

Next, FIG. 11 showing a tenth embodiment of the rotation suppressing means will be described.

In the embodiment shown in FIG. 11, in addition to the single parallel link mechanism 34 of the embodiment shown in FIG. has been established.

Therefore, in this embodiment, the spring member 54 can prevent the support base 32 from floating up during an earthquake.

Next, FIG. 12, which shows an eleventh embodiment of the rotation suppressing means, will be described.

In the embodiment shown in FIG. 12, instead of the linear bearing member 45 shown in FIG. 7, a roller member 55 that contacts the outer peripheral surface of the rod member 44 at three locations and a support member 56 that supports the roller member 55 are used. The support stand 32 is provided so as to be able to follow the horizontal movement of the pedestal 20, and the three roller members 55 have a disc spring 57 for pressing the outer peripheral surface of the rod member 44, and the pressing force of the disc spring 57, that is, in the horizontal direction. An adjusting member 58 consisting of a bolt and a nut is provided to adjust the restraining force of.

Therefore, in this embodiment, the support stand 32 can follow the pedestal 20 in the horizontal direction.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

(1) The rotation suppressing means has both ends of the two link members rotatably supported on the support base and the mounting member by pins,
In addition, since the two link members form a parallelogram with the support base and the attachment member, even if the pedestal moves in the vertical direction, the attachment member fixed to the pedestal and the support base are always held parallel. Therefore, it is possible to suppress the rocking vibrations around the axis in the horizontal direction by receiving seismic forces in the vertical and horizontal directions, and also to increase the floor area and to make the distance from the foundation to the floor low.

(2) The above parallel link mechanism is formed by forming a plurality of parallelograms sharing the - side in the same plane, and rotatably connecting the ends of the link members to the support base and the mounting member with pins. Since it is configured with a double parallel link mechanism, it is possible to eliminate horizontal movement of the support base due to vertical vibrations generated in the foundation.

(3) Since the support base is composed of an X-Y stage,
Torsional vibration of the seismic isolation floor on the pedestal can be suppressed.

(4) Since a plurality of sets of the double parallel link mechanisms are provided in directions perpendicular to each other, rocking vibrations about two axes parallel to and perpendicular to the upper surface of the foundation can be prevented.

(5) Since the horizontal relative displacement restraining means is provided between the support base and the mounting member, relative displacement in the horizontal direction between the mount base and the support base can be reliably suppressed.

(6) Since the viscous damper is provided between the support stand and the base, the horizontal response of the seismic isolation system to the horizontal seismic force of the seismic isolation floor on the mount can be reduced.

(7) Since the viscous damper is provided between the supports of the X-Y stage and between the supports and the base, the horizontal response of the seismic isolation system to the seismic force in the horizontal direction of the seismic isolation floor on the mount is reduced. can do.

(8) Since a spring member is provided between the support base and the pedestal to constantly press the support base downward, it is possible to prevent the support base from floating up during an earthquake.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a three-dimensional seismic isolation device showing an embodiment of the present invention, FIGS. 2 to 11 are longitudinal sectional views showing an embodiment of the rotation suppressing means of the invention, and FIG. A cross-sectional view showing another embodiment of the horizontal relative displacement restraining means of the rotation suppressing means of the present invention, and FIGS. 13 to 15 are longitudinal cross-sectional views showing a conventional three-dimensional seismic isolation device. 2... Foundation, 3... Base, 5, 8... Spring member, 20... Frame, 22... Seismic isolation floor, 23... Pedestal, 24... Three-dimensional seismic isolation device , 25.26...
Self-weight supporting means, 27... Rotation suppressing means, 30... Wire member, 31... Ball bearing member, 32...
・Support stand, 34...Single parallel link mechanism, 37...
Double parallel link mechanism, 38...X-Y stage, 46
゜48...Horizontal direction relative displacement restraint means, 53...Viscosity damper, 54...Spring member. Representative Patent Attorney Tadashi Akimoto Actual Diagram 2 24 Foundation 2o Abama 24 2 戊 7rJ Katsushinbukuro 1 2 as Foundation 3 Beneath 1 and 20 廿 31 Claws - IIJ Lodging/Fu Dressing) 34 Rods - 10 F〒υnkrai, Tian 132 Branch J No. 35 Ritsuku materials 33 pieces; Eve "(Kuranaka Mangi 34-!- Bamboo Rinfuka (former 1 KoP missing chair 32 support mortar 33 throat (Ise Y part child) 39th rule member 40 1st red gravity part neo figure 3 bed 36 links Its Banzai Chuy/Ministry of Transportation A etc. 39th Ray/Shi tongue V wood O 2 bases 32 branch 1 440t members 317rV--/v beresunda rock drunkenness 37 2 East-! - Row link type (horizontal - Fig. 9 2) 1 leech 1 engineered link material 37 double-throated row link tool 1 49 rhinoceros material 50 # saiko 51 Kunishin 4 pieces 52 corps equipment 53 pieces? fJ Ao-Damper 37 2 east hand link Ko U moxibustion 2 pieces Bumi Funfu town is 50 years old. 6 匪 7 Nova 20 Tobe 33 Tori) l-'f part part No. 12 44 Lot parts 550 1 de part Hayashi 56 cross 10 parts Ofu!)' 1 58 Tobu part part No.

Claims (1)

[Claims] 1. Between the foundation and the seismic isolation floor, horizontally movable self-weight supporting means; the self-weight supporting means are arranged independently and in parallel; A three-dimensional seismic isolation system comprising: a movably supported support means; and a rotation suppressing means comprising a parallel link mechanism between the support means and the seismic isolation floor. 2. The three-dimensional isolation system according to claim 1, wherein the parallel link mechanism includes a plurality of parallel link sets each including a plurality of link members whose parallel link surfaces are arranged parallel to each other on the same support base. earthquake system. 3. The parallel link mechanism is characterized in that each parallel link group consisting of a plurality of link members whose parallel link surfaces are arranged parallel to each other is arranged so that the parallel link surfaces are at right angles to each other. Three-dimensional seismic isolation system described. 4. The parallel link mechanism is characterized in that the ends of each link member are connected to the seismic isolation floor and the support base with pins, and a plurality of link members form a parallelogram.
The three-dimensional seismic isolation system according to any one of 2, 3, and 4. 5. The parallel link mechanism connects the ends of each link member to the seismic isolation floor and the support base with pins to form a plurality of sets of parallelograms in which a plurality of link members share one side. The three-dimensional seismic isolation system according to any one of claims 1, 2, 3, and 4. 6. The parallel link mechanism connects the ends of each link member to the seismic isolation floor and the support base with pins to orthogonally form a plurality of sets of parallelograms in which a plurality of link members share one side. Claims 1, 2, 3, 4, characterized in that it is also provided in the direction.
5. The three-dimensional seismic isolation system according to any one of 5. 7. According to any one of claims 1, 2, and 6, the support base is constituted by an X-Y stage made up of a plurality of support bases that move in directions perpendicular to each other in the horizontal direction. Three-dimensional seismic isolation system. 8. Claim 1, wherein the rotation suppressing means is provided with horizontal relative displacement restraining means between the seismic isolation floor and the support base to restrain horizontal relative displacement of both. The three-dimensional base isolation system according to any one of , 5 and 6. 9. The horizontal relative displacement restraining means is comprised of a rod member between the seismic isolation floor and the support base, and a member that supports the rod member so as to be movable only in the vertical direction. The three-dimensional seismic isolation system according to item 8. 10. The tertiary structure according to claim 8, wherein the horizontal relative displacement restraining means is constituted by a plurality of wire members arranged radially in a horizontal plane between the seismic isolation floor and the support base. Original seismic isolation system. 11. The support base includes a resistance plate supported on the lower surface of the support base in parallel with the base surface, and a container installed on the foundation for storing a viscous material to soak the resistance plate inside. 9. The three-dimensional seismic isolation system according to claim 8, comprising a viscous damper. 12. The three-dimensional seismic isolation system according to claim 7, wherein the viscous damper is provided between the support stands of the XY stage and between the support stand and the foundation surface. 13. The three-dimensional structure according to claim 1 or 2, wherein the rotation suppressing means includes a member between the seismic isolation floor and the support base that constantly presses the support base downward. Seismic isolation system.