JP4357085B2 - Seismic isolation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation device that attenuates and absorbs vibration transmitted from a floor of a building and protects a precise protected object that is vulnerable to vibration.
[0002]
[Prior art]
Conventional seismic isolation devices include electronic devices such as computers and servers, and antique works such as dishes and jars in museums and art galleries (hereinafter collectively referred to as protected objects in this specification). It was used to protect against vibrations such as earthquakes. For example, Japanese Patent Application Laid-Open No. 11-166590 and Japanese Patent Application Laid-Open No. 11-16659 (invention name: low-floor type seismic isolation device for display case) are disclosed as conventional techniques of such a base isolation device.
[0003]
The structure common to these seismic isolation devices consists of at least two arc-shaped X rails fixed to the bottom plate on the foundation and having a low center and high ends, and X fixed to the lower surface of the top plate above these X rails. At least two arc-shaped Y rails whose center is high and whose both ends are low in a direction perpendicular to the rail, a lower part sandwiches the X rail, an upper part sandwiches the Y rail, and a conical block provided with a disc spring in the center, X, Y This is a seismic isolation device having a shock absorber disposed at an end of the rail and a downwardly projecting support leg 7 fixed to the lower surface of the upper plate.
The conventional low-floor seismic isolation device for display cases uses arc-shaped X and Y rails, so the top plate moves up and down as the top plate moves horizontally during seismic isolation. In this way, the vertical movement of the top plate is suppressed.
[0004]
[Problems to be solved by the invention]
However, the arc-shaped rail is a precision mechanism in which the slide portion is slid along the arc-shaped rail, and the cost is high due to difficulty in processing.
In addition, disc springs are less expensive than ordinary springs, and thus are expensive in inverse proportion. Therefore, the conventional low floor type seismic isolation device for display cases is very expensive.
[0005]
Also, as the earthquake shakes faster, the disc spring of the conventional low-floor seismic isolation device for display cases cannot absorb the vertical movement, and the upper plate rises and the protected object moves up and down on the upper plate. There is a possibility that the vertical seismic isolation effect may not be high when the earthquake shakes quickly.
[0006]
Further, when the protected object is a computer server, a large number of wirings (hereinafter simply referred to as wirings in the present specification) such as power lines and communication cables are required. Currently, the number of wirings is increasing. However, in the base isolation device, the upper base isolation frame moves due to the base isolation, so it was necessary to devise measures to prevent the wiring from being damaged.
In addition to wiring outside the seismic isolation device, there has also been a demand to provide a hole for wiring in the seismic isolation device and to allow wiring to pass through this hole so that underfloor wiring can be performed.
[0007]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a seismic isolation device that realizes both low cost and increased seismic isolation effect.
Another object of the present invention is to provide a seismic isolation device that reliably prevents wiring breakage during seismic isolation and facilitates underfloor wiring.
[0008]
[Means for Solving the Problems]
In order to solve the above problem, the seismic isolation device according to claim 1 is:
A base isolation rack having an upper wiring introduction hole on which a protected object is placed;
A plurality of upper slide guides attached to the base isolation frame;
A plurality of lower slide guides to which the slide portion is attached so as to move in a direction substantially perpendicular to the movement direction of the slide portion of the upper slide guide and substantially parallel to the horizontal plane;
A lower surface cover having a lower wiring introduction hole to which the lower slide guide is attached;
A spring that is attached so as to expand and contract in accordance with movement of the slide portion of the upper slide guide and the lower slide guide, and biases the seismic isolation rack and the lower surface cover to be in a predetermined position;
An upper stopper attached to the base isolation frame;
A lower stopper attached to the lower surface cover;
A seismic isolation device comprising:
Together with the upper stopper and the lower stopper and the lower surface cover and the seismic isolation mount contacts to prevent seismic isolation deviating from the predetermined range, the area of the upper wire guide hole of the lower wiring introducing hole smaller than the area, wherein the upper wiring introduction hole when viewed from the base isolation gantry side is maintained in a state of penetrating there always on the upper side of the lower wire guide hole in MenShinji, the said upper wire guide hole It is characterized in that cutting of the wiring inserted through the lower wiring introduction hole is prevented.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the seismic isolation device of the present invention will be described. 1 is an exploded perspective view showing the internal structure of the present embodiment, FIG. 2 is also an external view, FIG. 3 is an explanatory view of a slide device, FIG. 4 is an internal view of the inside of the lower surface cover, and FIG. FIG. 6 is a front cross-sectional view, FIG. 7 is a side cross-sectional view, and FIG. 8 is an explanatory view for explaining the role of a stopper during a seismic isolation operation .
[0011]
As shown in FIG. 1, the seismic isolation device of the present embodiment includes a seismic isolation frame 1 on which an unillustrated protected body is placed, a slide device 2 attached to the lower side of the seismic isolation frame 1, A lower surface cover 3 attached to the lower side of the sliding device and an anti-slip mat 4 arranged on the lower side of the lower surface cover 3 are provided.
[0012]
The base isolation frame 1 is formed by attaching and fixing an upper surface cover 1a to a frame 1b in which square members are combined in a cross beam shape to form a robust structure. As shown in FIGS. 1 and 2A, the upper surface cover 1a is provided with an upper wiring introduction hole 1c which is a square hole. The upper wiring introduction hole 1c is not limited to a square hole, and can be a hole having various shapes such as a round hole and a round corner hole. These shapes are appropriately selected and designed.
[0013]
The slide device 2 uses two linear motion slide guides that move only in one direction. With the linear slide guide assumed in the present invention, taking the upper slide guide 2a shown in FIG. 3 as an example, the slide portion 2b slides smoothly in the X direction along the linear guide rail portion 2c. It is a mechanical element and is generally commercially available. The movement in the XY direction is realized by combining two of these linear motion type slide guides.
[0014]
Specifically, as shown in FIG. 3, the upper slide guide 2a and the lower slide guide 2d are oriented in the XY direction, which is a substantially vertical direction, and the slide portions 2b and 2e are attached via the connecting plate 2g. The connection plate 2g is provided with a hole (not shown) so as to coincide with a screw hole (not shown) provided in the slide portions 2b and 2e, and is screwed and fixed in the directions of arrows A and B shown in FIG. Further, springs 2h and 2i are attached to the slide portions 2b and 2e. The springs 2h and 2i expand and contract to give an urging force that stops at the approximate center of the guide rail portions 2c and 2f.
[0015]
As shown in FIG. 1, the lower surface cover 3 is arranged below the slide device 2, and the four slide devices 2 are attached and fixed to the lower surface cover 3. The lower surface cover 3 is also provided with a lower wiring introduction hole 3a. In FIG. 1, the lower stopper illustrated in FIG. 4 is disposed around the lower wiring introduction hole 3a. However, in FIG. 1, the illustration is omitted for the sake of clarity.
[0016]
With such a configuration, the base isolation frame 1 moves in the XY direction with respect to the lower surface cover 3. Thus, although it is good also as a seismic isolation apparatus which consists of the base isolation frame 1, the slide apparatus 2, and the lower surface cover 3, since the situation which slips on a floor is also assumed when a seismic isolation apparatus is directly mounted on the floor, It is desirable to place it on the floor via a non-slip mat 4. Further, instead of the non-slip mat 4, a surface on which the lower surface cover 3 contacts the floor may be formed as a rough surface to increase the contact resistance force. In addition, a dedicated pedestal designed for floor expansion can be provided to realize underfloor wiring. These configurations are appropriately selected. In addition, attachment of the slide device 2 to the base isolation frame 1 and the lower surface cover 3 will be described later.
[0017]
2A and 2C, the lower wiring introduction hole 3a and the upper wiring introduction hole 1c are in the center, and the lower wiring introduction hole 3a as viewed from the upper side of the base isolation frame 1 The upper wiring introduction hole 1c is attached so as to be a through hole. Further, the area of the lower wiring introduction hole 3a is made sufficiently larger than the area of the upper wiring introduction hole 1c. Even if the base isolation frame moves, the lower wiring introduction hole 3a and the upper wiring introduction hole 1c are maintained in a penetrating manner so that even if there is wiring, the base isolation operation does not break. Because.
[0018]
Next, the principle of movement of the seismic isolation device in the XY direction will be further described. As shown in FIG. 4, a lower slide guide 2d is fixed to the lower surface cover 3, and further a lower stopper 3b serving as a peripheral wall of the lower wiring introduction hole 3a is fixed. The lower stopper 3b is configured by forming a frame with an L-shaped angle and arranging a buffer body such as rubber and urethane so as to cover the inner wall surface thereof as shown in the cross-sectional view along the line AA in FIG. Has been. The lower slide guide 2d has a guide rail portion 2f arranged on the lower surface cover 3 so that the slide portion 2e moves in the Y direction.
[0019]
As shown in FIG. 5, an upper slide guide 2a is fixed to the base isolation frame 1, and an upper stopper 1d serving as a peripheral wall of the upper wiring introduction hole 1c is fixed. As shown in the sectional view taken along the line BB in FIG. 5, the upper stopper 1d is configured by forming a frame with an L-shaped angle and placing a buffer body such as rubber and urethane so as to cover the outer wall surface. ing. In the upper slide guide 2a, the guide rail portion 2c is arranged on the seismic isolation rack 1 so that the slide portion 2b moves in the X direction.
[0020]
When such a base isolation frame 1, the slide device 2, and the lower surface cover 3 are assembled, the structure shown in FIGS. 6 and 7 is obtained. 6, the spring 2h is attached to the upper pin 1e, and the spring 2i is attached to the lower pin 3c as shown in the side sectional view in FIG. .
[0021]
With this configuration, the operation differs between the X direction and the Y direction. In the X direction, as shown in FIG. 6, the base isolation frame 1 and the guide rail portion 2c move together in the X direction. However, the base isolation operation is performed by the expansion and contraction force of the spring h, and the base isolation rack 1 attempts to restore the original position.
Similarly, in the Y direction, as shown in FIG. 7, the base isolation frame 1, the upper slide guide 2a, the connecting plate 2g, and the slide portion 2e of the lower slide guide move in the Y direction. However, the seismic isolation operation is performed by the expansion / contraction force of the spring i, and the seismic isolation rack 1 attempts to restore the original position.
However, even if the operation is different between the X direction and the Y direction, the base isolation frame 1 can move with respect to the lower surface cover 3 at an arbitrary angle (direction) in the XY plane. Even if a small force is applied in an arbitrary direction of the seismic isolation rack 1, the seismic isolation rack 1 moves and performs a seismic isolation operation.
[0022]
The seismic isolation device designed to move in this way is prevented from moving beyond a predetermined range by the upper stopper 1d and the lower stopper 3b. During normal times, the springs 1h and 1i are biased so that the center of the upper wiring introduction hole 1c and the lower wiring introduction hole 3a are substantially coincided with each other as shown in FIG. When the seismic isolation operation is started, the seismic isolation frame is moved by the seismic isolation operation, and the shock absorbers of the upper stopper 1d and the lower stopper 3b collide with each other. And a movement stops and a vibration is absorbed by a buffer. By using such a seismic isolation device, the seismic isolation function is enhanced.
[0023]
Further, with this configuration, the upper wiring introduction hole 1c and the lower wiring introduction hole 3a are always penetrated even during the seismic isolation operation, so that a situation where the wiring breaks is prevented. For example, when the object to be protected is a server computer, a situation in which a failure occurs due to the breakage of the wiring is avoided.
[0024]
【The invention's effect】
As described above, according to the present invention, the seismic isolation device can be made inexpensive because it can be configured using relatively inexpensive parts such as a direct-acting slide guide and a coil spring rather than an expensive precision mechanism such as an arc-shaped rail or a disc spring. Can be configured.
In addition, since the seismic isolation device moves only in the horizontal XY direction and does not move in the vertical direction, the seismic isolation frame moves up and down even when the earthquake shakes faster. The situation in which the protected object moves up and down is avoided, and the vertical seismic isolation effect can be enhanced.
[0025]
When the object to be protected is a computer or electronic device, when the floor wiring is performed through the upper wiring introduction hole 1c and the lower wiring introduction hole 3a of the seismic isolation device, the upper stopper 1d and the lower stopper are used. The state in which the hole is penetrated by 3b is reliably maintained, and the situation where the overhead wire is broken is surely prevented.
[0026]
As described above, according to the present invention, it is possible to provide a seismic isolation device that achieves both low cost and increased seismic isolation effect.
Further, it is possible to provide a seismic isolation device that reliably prevents wiring breakage during seismic isolation and facilitates underfloor wiring.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an internal structure of an embodiment of a seismic isolation device of the present invention.
FIG. 2 is an external view of an embodiment of the seismic isolation device of the present invention.
FIG. 3 is an explanatory view of a slide device of the seismic isolation device of the present invention.
FIG. 4 is an inside view of the inside of the lower surface cover of the seismic isolation device according to the embodiment of the present invention.
FIG. 5 is an interior view of the interior of the seismic isolation rack of the seismic isolation device according to the embodiment of the present invention.
FIG. 6 is a front sectional view of the seismic isolation device according to the embodiment of the present invention.
FIG. 7 is a side sectional view of the seismic isolation device according to the embodiment of the present invention.
FIG. 8 is an explanatory diagram for explaining the role of the stopper during the seismic isolation operation of the seismic isolation device according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seismic isolation frame 1a Top cover 1b Frame 1c Upper wiring introduction hole 1d Upper stopper 1e Upper pin 2 Slide device 2a Upper slide guide 2b Slide part 2c Guide rail part 2d Lower slide guide 2e Slide part 2f Guide rail part 2g Connecting plate 2h Spring 2i Spring 3 Lower surface cover 3a Lower wiring introduction hole 3b Lower stopper 3c Lower pin 4 Non-slip mat

Claims (1)

A base isolation rack having an upper wiring introduction hole on which a protected object is placed;
A plurality of upper slide guides attached to the base isolation frame;
A plurality of lower slide guides to which the slide portion is attached so as to move in a direction substantially perpendicular to the movement direction of the slide portion of the upper slide guide and substantially parallel to the horizontal plane;
A lower surface cover having a lower wiring introduction hole to which the lower slide guide is attached;
A spring that is attached so as to expand and contract in accordance with movement of the slide portion of the upper slide guide and the lower slide guide, and biases the seismic isolation rack and the lower surface cover to be in a predetermined position;
An upper stopper attached to the base isolation frame;
A lower stopper attached to the lower surface cover;
A seismic isolation device comprising:
Together with the upper stopper and the lower stopper and the lower surface cover and the seismic isolation mount contacts to prevent seismic isolation deviating from the predetermined range, the area of the upper wire guide hole of the lower wiring introducing hole smaller than the area, wherein the upper wiring introduction hole when viewed from the base isolation gantry side is maintained in a state of penetrating there always on the upper side of the lower wire guide hole in MenShinji, the said upper wire guide hole A seismic isolation device characterized by preventing cutting of wiring inserted into the lower wiring introduction hole.

Images