JP4238340B2 - Seismic isolation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation device for reducing movement caused by an earthquake, and more particularly to a seismic isolation device suitable for use in partial seismic isolation of equipment, furniture, furniture, crafts, etc. installed inside a building. It is.
[0002]
[Prior art]
The idea of reducing the transmission of horizontal movement during earthquakes by placing buildings on a sphere has been proposed for a long time. For example, Japanese Patent Application Laid-Open Nos. 64-17945 and 1-275821 describe using a sphere to provide seismic isolation for buildings, and for example, Japanese Patent Application Laid-Open Nos. 5-164168 and 10- Japanese Patent No. 38022 discloses that a sphere is used to seismically isolate not only the building but also equipment installed therein.
[0003]
Among the seismic isolation devices, those described in the latter two publications can cope with vibrations having a larger amplitude than those described in the former two publications, and are installed inside the building. It can be used for partial seismic isolation, such as machined.
[0004]
That is, the seismic isolation device described in JP-A-5-164168 and the seismic isolation device described in JP-A-10-38022 which is an improved version thereof are schematically shown in FIG. As described above, a fixed bottom body 51 having a concave curved surface 52 installed on a floor (or foundation) of a building directly or via a vibration isolating member, and an installation object such as a device that is a seismic isolation object (or A load support 54 having a cradle 53 on the top and a convex curved surface 55 on the bottom, and several spheres 57 are arranged on the circumference and held by the holding frame 58. The moving support body 56 is inserted between the fixed bottom body 51 and the load support body 54 by bringing the spherical body 57 into contact with the upper and lower curved surfaces 52 and 55 facing each other. .
[0005]
This seismic isolation device is installed horizontally, and when the fixed bottom body 51 is displaced laterally during the earthquake and repeats reciprocation, the moving support 56 is smaller than the fixed bottom body 51. The purpose of seismic isolation can be achieved by performing a reciprocating motion and performing a reciprocating motion in which the load support 54 is smaller than the moving support 56.
[0006]
Note that the seismic isolation device described in the above-mentioned Japanese Patent Application Laid-Open No. 10-38022 applies springs 59 and 60 that act to hold at a central position on at least one of the load support 54 and the movable support 56. It is designed to handle earthquakes with large amplitudes.
[0007]
[Problems to be solved by the invention]
When the conventional seismic isolation device described with reference to FIG. 5 is used for partial seismic isolation of equipment, furniture, furniture, crafts, etc. installed inside the building, these seismic isolation objects are mounted on the cradle 53. Since the placed load support 54 is on the sphere 57, when the seismic isolation object is intentionally or unintentionally pushed, the load support 54 depends on the weight or strength of the applied force. In addition, since the lower surface of the load support 54 is a curved surface 55 and tilts while moving, it cannot be avoided that the load support 54 is unstable.
[0008]
The present invention provides a fixed bottom body having an upper surface as an inclined surface exemplified by a concave curved surface, and a load support having an inclined surface exemplified by a convex curved surface on the lower surface, on which a seismic isolation object is placed. And a moving support formed by arranging a plurality of spheres on the circumference and holding them on a holding frame, and the moving support contacts the fixed bottom body and the load by bringing the spheres into contact with the upper and lower inclined surfaces. The above-described seismic isolation device inserted between the support and the center position holding mechanism elastically acting on at least one of the load support and the moving support in addition to the above-described seismic isolation device. It was made to solve the above-mentioned problem that the seismic isolation device has a concern that the seismic isolation object may be moved by an external force that does not originate from the earthquake. The seismic isolation object must not move due to external forces other than earthquakes. Located in.
[0009]
[Means for Solving the Problems]
To solve the previous SL object, the present invention provides a load bearing body fixedly connected to the stationary base body in a neutral position where the centers are matched fixed bottom member and the load supporting member, coupling is released when the center is deviated For the seismic isolation device having a lock mechanism in which the fixed bottom body and the load support body perform separate lateral movements , the lock mechanism is fitted in a guide hole provided in the load support body so as to be vertically movable. A shaft member having two upper and lower circumferential grooves in the downward projecting portion and having a locking piece at the lower end, an engagement piece engaging with one of the circumferential grooves, and the locking provided on the fixed bottom body An engaging recess for inserting a piece, and engaging the engaging piece with an upper circumferential groove at a neutral position where the centers of the fixed bottom and the load support coincide with each other, and the locking piece into the inserting recess The load support body is coupled and fixed to the fixed bottom body by inserting, The engaging piece with the engaging piece when the serial center is shifted to escape from the fitting recess is assumed to be engaged in the circumferential groove of the lower.
[0010]
In normal times, the load support is fixed to the fixed bottom, so that the predetermined position and posture can be stably maintained without moving even if the seismic isolation object placed on the load support is pushed. When the earthquake occurs, the fixed base moves laterally, and the moving support and load support move with this movement. Seismic isolation is performed by the vibration reduction function of the seismic isolation device.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. The lower cover body 1 is a flat square and is composed of a bottom plate 1a and a peripheral plate 1b. The cover plate 2a and the peripheral plate 2b The upper cover body 2 is formed by fitting the peripheral side plates 1b and 2b so as to overlap each other, and the lid plate 2a is provided with an operation hole 3 at the center and a plurality of the surrounding holes, three in this embodiment. Are provided at equal intervals in the circumferential direction. An annular stop member 5 formed at a height substantially equal to that of the peripheral side plate 1a is substantially inscribed in the peripheral side plate 1a and is fixed to the lower cover body 1.
[0012]
The bottom plate 1a has a thin disk shape, and a fixed bottom body 7 formed with an inclined surface 8 curved in an upward concave shape that has the lowest central portion and is gradually higher toward the outer peripheral edge. And are fixed to the bottom plate 1a by appropriate means such as screws (not shown).
[0013]
Further, a receiving base 11 made of a plane square flat plate, and a slide having a thin disc shape and an inclined surface 13 which is curved in a downward convex shape which is the highest in the central portion and gradually lower toward the outer peripheral edge. A load support body 10 including a base 12 and a pedestal 14 that is separated from each other by being slightly separated in the vertical direction is provided above the fixed bottom body 7. In the present embodiment, there are three pedestal columns 14, which are arranged at equal intervals in the circumferential direction and pass through the window holes 4 of the cover plate 2 a, with the cradle 11 above the upper cover body 2 and the slide base 12 below. It is located inside the cover body 1.
[0014]
When the center of the load supporting body 10 coincides with the center of the fixed bottom body 7, that is, when the center is placed on the vertical center line N passing through the center of the fixed bottom body 7 shown in FIG. The interval between the two inclined surfaces 8 and 13 is made to be substantially the same from the center to the outer peripheral edge. Further, the two inclined surfaces 8 and 13 are not limited to those curved in a spherical shape, but may be conical surfaces.
[0015]
Further, several, generally six to twelve spheres 17 having their upper and lower ends protruding from each other and a movable support 16 which is freely held by an annular holding frame 18 are fixed to the fixed base 7 and the load support. 10 is inserted. The spheres 17 are arranged at equal intervals in the circumferential direction on one plane and are in contact with the upper and lower inclined surfaces 8 and 13 facing each other. Further, when the moving support body 16 is centered on the vertical center line N, the load support body 10 is also placed on the vertical center line N because the inclined surfaces 8 and 13 are at substantially constant intervals. The position is adjusted. In this state, if the fixed bottom body 7 is installed on a horizontal plane, the movable support 16 and the load support 10 are also placed on the horizontal plane, and the load support 10 tilts the seismic isolation object in this neutral position. It can be placed without any problems.
[0016]
When an earthquake occurs, the lower cover body 1 fixed mainly to the floor of the building and the fixed bottom body 7 fixed to the floor vibrate integrally with the floor as the ground rolls. When the fixed bottom body 7 moves from the neutral position shown in FIG. 1 and FIG. 4 (A) centered on the vertical center line N in the lateral direction, for example, to the right in the figure, the movable support body that is on the movable support body. 16 moves to the left by rotating the spherical body 17 counterclockwise as the inclined surface 8 moves in the right direction. As a result, the moving support 16 is fixed to the right-direction moving distance of the fixed bottom body 7. It moves rightward by a distance corresponding to the difference from the leftward movement distance with respect to the bottom body 7 and tilts downward to the right. On the other hand, the load support 10 rides on the moving support 16 and inclines to the right and slides to the right, but receives the force moved to the left by the sphere 17 rotating counterclockwise, It moves to the right by a distance corresponding to the difference between these forces. For this reason, as shown in FIG. 4B, when the fixed bottom body 7 is displaced from the vertical center line N to NR1, the movable support 16 is displaced to NR2 having a stroke smaller than this, and the load support body is moved. 10 further shifts to NR3 of a stroke smaller than this.
[0017]
When the fixed bottom body 7 moves to the left from NR1 to NL1 shown in FIG. 4C, the moving support 16 moves to NL2 having a smaller stroke for the same reason as described above, and the load support 10 is Further, it moves to NL3 having a smaller stroke.
[0018]
That is, the amplitude NR3-NL3 of the load support 10 is significantly smaller than the amplitude NR1-NL1 of the fixed bottom body 7, and the seismic isolation purpose of reducing the transmission of horizontal motion due to the earthquake is achieved.
[0019]
The seismic isolation device according to the present invention is designed to install at least three units on the same horizontal plane and share and support the seismic isolation object, and place the seismic isolation object directly across the cradle 11. Alternatively, a mounting table 20 indicated by a two-dot chain line in FIG. 1 is prepared and placed across the receiving tables 11, and the seismic isolation object is mounted on the mounting table 20.
[0020]
Here, as shown in FIGS. 4 (B) and 4 (C), the load support 10 repeats a right-down slope and a left-down slope during an earthquake, but the slope of the slopes 8 and 13 and the sphere 17 By properly setting the diameter and the diameter of the arrangement circumference, the inclination can be made slight, and even if the vertical motion and inclination are applied simultaneously with the lateral vibration to the seismic isolation object, it will not fall down .
[0021]
In the present embodiment, the receiving pieces 22 and 23 provided with notched spherical receiving holes on the receiving table 11 and the mounting table 20 are positioned opposite to each other on the vertical center line N at the center of the receiving table 11, that is, in the neutral position. A free receiving body 21 is provided which protrudes and is formed by fitting the receiving body 24 into these receiving holes. The universal receiver 21 works so as to keep the mounting table 20 horizontal even when the load support 10 is tilted, and the vertical fine vibration accompanying the slight vertical movement of the central portion from N to NR3 and NL3 in FIG. Is added to the lateral vibration, but the safety of the seismic isolation object can be further improved by not adding the tilt.
[0022]
Although the purpose of seismic isolation can be achieved as described above, in this embodiment, the lateral movement of the load support 10 and the movable support 16 is suppressed even for an earthquake accompanied by a lateral vibration having a very large amplitude. In order to achieve this, center position holding mechanisms 25 and 26 each including a plurality of dampers that are radially arranged by coupling both ends to the outer peripheral edge and the stopper member 5 are provided. The center position holding mechanisms 25 and 26 are omitted from the illustration of the specific configuration, but in addition to the coil springs and leaf springs described in the above-mentioned Japanese Patent Application Laid-Open No. 10-38022, fluid pressure dampers and the like are appropriately used. These dampers are elastically acted so as to hold the load support 10 and the movable support 16 in the neutral position, so that the lateral movement is sufficiently larger than that of the fixed bottom body 7. It becomes possible to make it small, and when the earthquake ends, it is possible to suppress the load support 10 and the movable support 16 from continuing to move due to inertia and immediately hold them at the center position. The center position holding mechanisms 25 and 26 may be provided only on one of them without being provided on both the load support 10 and the moving support 16.
[0023]
In the present embodiment, components other than the cradle 11 are wrapped in the lower cover body 1 and the upper cover body 2, but there is no functional problem even if they are exposed to the outside. However, depending on the type and installation location of the seismic isolation object, it is a good idea to dispose it in the lower cover body 1 and the upper cover body 2 so as not to impair the beauty.
[0024]
Next, when the seismic isolation object or the mounting table 20 and the cradle 11 are intentionally or inadvertently pushed, the load support 10 moves together depending on the weight of the seismic isolation object or the strength of the applied force. Therefore, there is a concern that the inclined surface 13 of the lower surface thereof is inclined by sliding on the sphere 17 at the neutral position, and the posture of the seismic isolation object is unstable.
[0025]
The present invention has an important object to prevent the seismic isolation object from moving due to an external force not derived from an earthquake as described above. For this purpose, the load support 10 is fixedly coupled to the fixed bottom body 7. The lock mechanism 30 is provided.
[0026]
That is, the embodiment of the lock mechanism 30 will be described with reference to FIGS. 1 and 2. The shaft member 32 can be moved up and down in the guide hole 31 provided in the slide base 12 at the center of the load support 10. The shaft member 32 has two upper and lower circumferential grooves 33A and 33B that are substantially adjacent to each other in a downward projecting portion, and has a spherically-engaging locking piece 34 at the lower end thereof that is freely mounted to rotate. An engagement portion 35 is formed of a plurality of leaf springs having one end fixed to the slide base 12 so as to surround the shaft member 32 so that the free end is alternately fitted and engaged with one of the circumferential grooves 33A and 33B. Further, an insertion recess 36 is provided which is positioned at the center of the fixed bottom body 7 and into which a part of the locking piece 34 is inserted.
[0027]
At the center position, as shown in FIGS. 1 and 2A, the load support 10 is inserted by engaging the engaging piece 35 into the upper circumferential groove 33A by inserting the engaging piece 34 into the inserting recess 36. Is fixedly coupled to the fixed bottom body 7 with a shaft member 32 interposed. For this reason, even if a lateral force not derived from an earthquake is applied, the seismic isolation object can be stably maintained at a predetermined position and posture without moving or tilting.
[0028]
When a very weak earthquake occurs, the above state is maintained, but if an earthquake exceeding a certain intensity occurs and the centers of the fixed bottom body 7 and the load support body 10 and the movable support body 16 shift, The stop piece 34 is removed from the fitting recess 36 and the shaft member 32 is pushed up. For this reason, the engaging member 35 is fitted and engaged with the lower circumferential groove 33B to hold the shaft member 32 in the raised position, and the coupling between the fixed bottom body 7 and the load support body 10 is released, and thereafter It does not cause inconveniences such as an obstacle to the seismic isolation action or a problem that the locking piece 34 enters the fitting recess 36 and is damaged every time it vibrates. The state at this time is shown in FIG.
[0029]
When the earthquake is over, the load support 10 and the movable support 16 return to the neutral position by the inclined surfaces 8 and 13 or in addition to the center position holding mechanisms 25 and 26. 11, and the shaft member 32 is pushed down using the operation hole 3, whereby the load support body 10 can be coupled and fixed to the fixed bottom body 7 again.
[0030]
The lock mechanism 30 can be installed by extending a part of either or both of the slide base 12 and the fixed bottom body 7 outward. However, when installed in the central portion as in the present embodiment, there is an advantage that the entire apparatus can be installed without increasing the size.
[0031]
【The invention's effect】
As described above, according to the present invention, in addition to exhibiting an excellent function for partial seismic isolation, the movement when a force not derived from an earthquake is applied is prevented, so that It maintains stable position and posture, and provides excellent safety.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is an enlarged partial longitudinal sectional view for explaining the locking mechanism of FIG. 1 and its operation.
3 is a cross-sectional view of the embodiment of FIG.
FIG. 4 is an operation explanatory diagram of the embodiment of FIG. 1;
FIG. 5 is a schematic vertical sectional view showing a conventional example.
[Explanation of symbols]
7 Fixed bottom, 8, 13 Inclined surface, 10 Load support, 11 Receiving base, 12 Sliding base, 16 Moving support, 17 Sphere, 18 Holding frame, 20 Mounting base, 21 Free receiving body, 25, 26 Center position Holding mechanism, 30 lock mechanism

Claims (1)

A fixed bottom body having a concave inclined surface on the upper surface, a load support body having a convex inclined surface on the lower surface on which a seismic isolation object is placed, and a plurality of spheres arranged on the circumference to hold the frame A movable support that is held between the fixed bottom body and the load support so that the spherical body contacts the inclined surfaces facing each other vertically. In the seismic device,
The load support is coupled and fixed to the fixed bottom at a neutral position where the centers of the fixed bottom and the load support coincide with each other, and when the center is shifted, the coupling is released and the fixed bottom and the load are fixed. in seismic isolation device with the lock Organization which is adapted and support to perform mutually separate lateral movement, the locking mechanism is fitted vertically movable in the guide hole formed in the load bearing body downward projecting portion A shaft member having two upper and lower circumferential grooves and having a locking piece at the lower end, an engagement piece that engages with one of the circumferential grooves, and an insertion for fitting the locking piece provided on the fixed bottom body By engaging the engaging piece with the upper circumferential groove at a neutral position where the centers of the fixed bottom body and the load support coincide with each other, and inserting the locking piece into the fitting recess. A load support is coupled and fixed to the fixed bottom, and the center is Isolator characterized in that said locking piece when said engaging piece with escape from the fitting recessed portion is intended to engage the circumferential groove of the lower.

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