JP2001041285A - Base isolation structure and base isolation auxiliary device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate relative movement of a body to be supported to a base regarding small scale vibration. SOLUTION: A base isolation device 2 to relatively movably and horizontally support a body 4 to be supported is situated on a foundation 3, and a base isolation auxiliary device 1 to block relative movement of the body 4 to be supported during vibration of a given value or less is situated on the foundation 3. The base isolation auxiliary device 1 comprises a means 5 to be locked situated at one of the foundation 3 and the body 4 to be supported; a lock means 8 situated at the other and locked at the means 5 to be locked; a detecting means 6 to detect vibration of a given value or more; and a moving mans 7 to cause the lock means 8 to enter and leave the means 5 to be locked side by the pressure action of fluid based on an output signal from the detecting means 6. During vibration of a given value or more, the moving means 7 separates the lock means 8 from the means 5 to be locked and the relative movement of the body 4 to be supported is allowed, based on an output signal from the detecting means 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates not only to a precision machine which is vulnerable to vibrations such as a computer, but also to a supported body such as a plate (floor) attached to a heavy general building. The present invention relates to a seismic isolation structure and a seismic isolation auxiliary device configured to support the supported body by a seismic isolation device only when a large vibration acts.

[0002]

2. Description of the Related Art Conventionally, a building (supported object) is sometimes supported via a seismic isolation device so as to be able to move relatively to the ground as a foundation. The vibration is hardly transmitted to the building by the seismic isolation device.

As shown in FIG. 10, for example, the seismic isolation device includes an outer housing 61 fixed to a lower surface of a plate member 60 attached to a building, and a disk-shaped support provided in the outer housing 61. It has a member 52 and a large number of small balls 64 circulated freely in a space 63 formed between the outer housing 61 and the support member 62.

The support member 62 is integrally supported by the outer casing 61, and the lower surface of the support member 62 is a flat support surface. The lower small ball 64 rolls on the base surface 65.

When an earthquake or the like occurs, the small balls 64 roll on the base surface 65 and circulate in the space 63, so that the base surface 65
The plate member 60 relatively moves in an arbitrary direction, and the relative movement buffers the vibration of the base surface 65 so that the vibration of the base surface 65 does not directly reach the plate member 60.

[0006]

However, in the conventional seismic isolation device, when a large-scale vibration occurs due to an earthquake or the like, the seismic isolation device moves the supported member such as the plate member 60 relative to the base. Although it is good to buffer the vibration by this relative movement, even when a small-scale vibration due to gusts or the like occurs, the relative movement is performed by the seismic isolation device, so that the non-seismically isolated structure is supported. There is a problem that the swing is large compared to the body.

In view of the above problems, the present invention restricts the relative movement of the supported body with respect to the foundation for small-scale vibrations, and releases the restriction for large-scale vibrations. An object of the present invention is to provide a seismic isolation structure and a seismic isolation auxiliary device that can achieve a great seismic isolation effect.

[0008]

According to a first aspect of the present invention, there is provided a seismic isolation structure for supporting a supported member on a foundation so as to be relatively movable in a horizontal direction. A device 2 is provided, and the base 3 is provided with a seismic isolation assisting device 1 for preventing the relative movement of the supported member 4 at the time of vibration less than a predetermined value. And locked means 5 provided on one of the supported members 4
A locking means 8 provided on the other side and engaged with and disengaged from the locked means 5, a detecting means 6 for detecting a vibration equal to or more than a predetermined value,
Moving means 7 for moving the locking means 8 to the base 3 side and the locked means 5 side by the pressure action of the fluid 14 based on the output signal of the detecting means 6; At this time, based on an output signal of the detecting means 6, the moving means 7 disengages the locking means 8 from the locked means 5 to allow the relative movement of the supported body 4. It is.

A seismic isolation assisting device according to a second aspect of the present invention relates to the locked means 5 provided on one of the foundation 3 and the supported body 4 and the locked means 5 provided on the other. A locking means 8 for detaching, a detecting means 6 for detecting a vibration equal to or more than a predetermined value, and a locking action of the locking means 8 based on an output signal of the detecting means 6 by a pressure action of a fluid 14 to the base 3 side and the cover Moving means 7 for moving back and forth to the locking means 5 side, and when the vibration is equal to or more than a predetermined value, the moving means 7 moves the locking means 8 based on the output signal of the detecting means 6 to the locked means 5 to allow the relative movement of the supported member 4.

Therefore, when the vibration is less than a predetermined value, the locking means 8 is moved by the pressure action of the fluid 14 so that the locked means 5
To advance and lock. Therefore, the supported member 4 is the seismic isolation device 2
Accordingly, the relative movement of the supported member 4 in the horizontal direction is prevented.

When the vibration exceeds a predetermined value, the detecting means 6
Detects the vibration, and the moving means 7 releases the locking means 8 from the locked means 5 based on the detection signal. Therefore, the vibration from the foundation 3 is buffered by the seismic isolation device 2.

Further, the seismic isolation assist device according to claim 3 is
The locking means 8 includes a plurality of locking bodies 28,
Are urged toward the locked means 5 side by the elastic body 29 provided respectively, and when the vibration becomes less than a predetermined value, the moving means 7
The locking means 8 is advanced toward the locked means 5 and locked to prevent the relative movement of the supported body 4.

Therefore, when the vibration becomes less than a predetermined value, the moving means 7 based on the detection signal of the detecting means 6.
However, the locking means 8 is advanced toward the locked means 5 and locked. At this time, the locking bodies 28 individually urged by the elastic bodies 29 are locked to the locked unit 5. Therefore, the swing of the supported member 4 by the seismic isolation device 2 is prevented.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. <First Embodiment> First, in FIGS. 1 and 2, reference numeral 1 denotes a seismic isolation assist device that constitutes one of the seismic isolation structures of the present invention, and reference numeral 2 denotes a conventionally known isolator that constitutes the other of the seismic isolation structure. 1 shows a vibration device.

Before describing the seismic isolation assisting device 1 according to the present invention, a conventionally known seismic isolation device 2 will be described. In FIG. 1, a plurality of seismic isolation devices 2 are arranged at predetermined locations on a foundation 3 arranged on the ground or the like to support a supported body 4 such as a building. When vibrated in the (lateral direction), the vibration
The relative movement of the supported body 4 and the foundation 3 is allowed so as not to be transmitted to the support member, and a rubber-made elastic body processed into a cylindrical shape is used.

The seismic isolation device 2 does not need to use an elastic body made of rubber or the like processed into a columnar shape as described above. For example, between the foundation 3 and a supported body 4 such as a building or the like. A structure in which a plurality of spheres are interposed (not shown) can also be adopted, and the seismic isolation device 2 restores the base 3 and the supported body 4 to their original positions when the base 3 and the supported body 4 move relative to each other. Restoring means is provided directly or indirectly.For example, as such a restoring means, by contacting a sphere with a spherical concave receiving member, a steel ball is placed at the center of the receiving member by the weight of the building. Rolling devices and devices utilizing the elastic force of springs are known (not shown).

Next, the seismic isolation assisting device 1 according to the present invention will be described. The seismic isolation assisting device 1 includes a locked means 5 provided on the supported body 4, a detecting means 6 provided on a foundation 3 provided on the ground or the like, and a support base 3a provided on the base 3.
A seismic isolation assisting device main body 1a in the form of a square tube fixed through the base member, a moving means 7 provided on the seismic isolating assisting device main body 1a, and a locking means 8 attached to the moving means 7.

The locked means 5 comprises a rectangular plate-shaped locked body 10 having a recess 9 formed therein.

The detecting means 6 includes a disc-shaped main body 1 of the detecting section.
1 and a detection unit 12 provided in the detection unit main body 11. The detection unit main body 11 has a slope 13 that is lowered toward the center, and the fluid 1 is located at the center.
A pressure discharge hole 15 for discharging a pressure of 4 (air) is formed.

The detecting section 12 is provided with a disk-shaped moving body 16 for moving the detecting section main body 11. A large ball 18 is provided at the center of the moving body 16 so as to be freely rollable, and a plurality of small balls 19 that can be rolled are arranged at equal intervals on the peripheral edge. The moving body 16 has a predetermined mass so as to move with a vibration equal to or more than a predetermined value, and the pressure of the fluid 14 does not hinder the movement of the moving body 16.

As shown in FIG. 6, the moving means 7 includes a cylinder 20 provided on the support 3a, a supply source 21 for supplying the fluid 14 to the cylinder 20, and a cylinder 20 for the fluid 14. Direction 2 to switch the flow path to
And the air operated valve 22 in position. Note that the source 2
1 is separately provided in a factory or the like.

The plunger 2 of the cylinder 20
A support plate 24 having a rectangular shape in a plan view is attached to 3, a plurality of columns 25 are erected on the support plate 24, and the locking means 8 is provided on each column 25.

In the locking means 8, a rectangular pressing plate 26 is mounted on each of the columns 25, and a plurality of bolts 27 penetrate the pressing plate 26. The locking bodies 28 are screwed together, and an elastic body 29 made of a spring is provided between each locking body 28 and the pressing plate 26.
9, each of the locking bodies 28 is urged so as to individually engage with the locked means 5 so as to be able to move back and forth.

The flow path of the fluid 14 will be described with reference to FIG. The air operated valve 22 switches between a switching position A where the supply source 21 and the primary pressure chamber 20a of the cylinder 20 are connected, and a switching position B where the supply source 21 and the secondary pressure chamber 20b of the cylinder 20 are connected.

Then, at the switching position A shown by a solid line in FIG. 6, the supply source 21 and the first input port N of the air-operated valve 22
1 are connected by a supply flow path 30, and a branch flow path 31 that connects the supply path flow path 30 and the air-operated valve 22 is connected to the supply flow path 30. The air-operated valve 22 is urged downward against the spring 35 by the pressure of the fluid 14 supplied from the branch channel 31.

The pressure discharge passage 32 connected to the branch flow passage 31 is connected to the pressure discharge hole 15 of the detection means 6, and the first output port O1 of the air-operated valve 22 is connected to the primary side flow passage 33. The second output port O2 is connected to the secondary pressure chamber 20b by the secondary flow path 34.

Next, the operation of the seismic isolation assist device 1 will be described. 4 (a) and 4 (b) show a state in which no vibration or the magnitude of the vibration is less than a predetermined value, and the moving body 16 of the detecting means 6 closes the pressure discharge hole 15. And
As shown by the solid line in FIG.
, The supply passage 30 and the primary passage 33 communicate with each other, and the primary pressure chamber 20a of the cylinder 20 and the supply source 2
1 is connected, and the fluid 14 is filled in the primary pressure chamber 20a. Then, the locking means 8 is urged toward the locked means 5 by the pressure action of the fluid 14, and each locking body 28 is locked to the locked means 5 by the locking means 8 as shown in FIG. I do.

Next, when the magnitude of the vibration exceeds a predetermined value from the state of FIGS. 4A and 4B, FIG.
As shown in (b), the moving body 16 of the detecting means 6 separates from the pressure discharge hole 15 and moves to the inclined surface 13, the pressure discharge hole 15 is opened, and the fluid 1 supplied from the supply source 21 is released.
4 is discharged from the pressure discharge hole 15 through the branch flow path 31 and the pressure discharge flow path 32, and the air-operated valve 2
2 is released.

Then, the air-operated valve 22 is urged by the spring 35 to switch from the switching position A to the switching position B shown by the dashed line in FIG. 6, and the second input port N2 of the air-operated valve 22 is connected to the supply passage 30. And the third output port O3 is
The fluid 14 is supplied to the secondary pressure chamber 20 b of the cylinder 20. The fluid 14 is supplied to the secondary pressure chamber 20 a of the cylinder 20. Next, the plunger 23 of the cylinder 20 moves downward, and the locking means 8 is disengaged from the locked means 5.

The relative movement of the supported member 4 in the horizontal direction is buffered by the seismic isolation device 2.

Next, when the magnitude of the vibration becomes smaller than a predetermined value, the moving body 16 of the detecting means 6 moves from the inclined surface 13 to the pressure discharge hole 15 and closes the pressure discharge hole 15. Then, the fluid 14 is supplied to the air-operated valve 22 through the branch passage 31.
Is supplied, the air-operated valve 22 switches from the switching position B to the switching position A against the spring 35, the primary pressure chamber 20a of the cylinder 20 communicates with the supply source 21, and the fluid 14 flows into the primary pressure chamber 20a of the cylinder 20. Is filled, the plunger 23 moves upward, and all the locking bodies 28 of the locking means 8 are locked to the locked means 5 as shown in FIG.

The locking state of the locking means 8 after the vibration may be, for example, a state as described below depending on the swinging condition. First, the state shown in FIG. 7 (b) is a state in which the supported body 4 twists in the turning direction (horizontal direction) with respect to the foundation 3, and the seismic isolation assist device 1 follows the twist,
The peripheral surface of a part of the locking body 28 indicated by oblique lines is pressed against the locked means 5.

Next, the state shown in FIG. 7C is a state in which the locking means 8 has shifted from the locked means 5.
A part of the locking body 28 is locked to a part of the locked means 5, and the seismic isolation device 2 does not act on the supported body 4 for vibration less than a predetermined value.

As described above, in any of the states shown in FIGS. 7A to 7C, the locking means 8 can be securely engaged with the locked means 5, so that even if the fluid 14 is air, the seismic isolation assisting method can be used. The function of the device 1 can be sufficiently exhibited.

In the first embodiment, the air-operated valve 22 is used. However, the air-operated valve may be an electromagnetic valve, and can be appropriately changed. Further, it can be appropriately changed according to the type of the fluid 14.

<Second Embodiment> Next, a second embodiment will be described with reference to FIGS. In these figures, the differences from FIG. 2 are as follows.

A fluid container 37 is provided in the main body 36 having a rectangular cylindrical shape, and the pressing member 3 which moves the container 37 is provided.
8 are provided. The pressing body 38 is composed of a column 40 which penetrates the upper plate 39 of the container 37 in a liquid-tight manner, and a square plate-shaped upper pressing plate 41 and a lower pressing plate 42 fixed to both upper and lower ends of the column 40. The upper pressing plate 41 is provided with locking members 44 individually urged by a plurality of springs 43.
a is constituted. Further, a spring 45 is provided between the upper plate 39 of the container 37 and the lower pressing plate 42, and the lower pressing plate 42 is urged by the spring 45 in a direction to compress the fluid 14.

Detection means 46 of the seismic isolation auxiliary device main body 36
Is composed of a disc-shaped detection unit main body 47 and a detection unit 48 provided on the detection unit main body 47. The detection unit main body 47 has an inclined surface 49 that is lowered toward the center, and a pressure discharge hole 50 that discharges the pressure of the fluid 14 is formed in the center. Is formed. The detection unit 48 includes a spherical moving body 52 having a predetermined mass. Then, a supply source (not shown) of the fluid 14 and the detection means 4
6, the container 37 is connected via a connection pipe 54.

Next, the operation of the seismic isolation structure will be described. The state shown in FIG. 8 indicates a state in which no vibration or the magnitude of the vibration is less than a predetermined value, the moving body 52 of the detection means 46 closes the pressure discharge hole 50, the fluid 14 is filled in the fluid container 37, The spring 45 is compressed by the pressure of 14, the locking means 44a is urged toward the locked means 5 via the pressing body 38, and the locking means 44a is pressed against the locked means 5 and locked. I have.

Next, when the magnitude of the vibration exceeds a predetermined value from the state shown in FIG. 8, as shown in FIG.
6 is disengaged from the pressure discharge hole 50 and the inclined surface 4
9 and the pressure discharge hole 50 is opened. At this time, the fluid 14 contained in the container 37 is discharged to the outside through the connecting pipe 54, the supply hole 51, and the pressure discharge hole 50 by the force of the spring 45. Then, at the same time when the fluid 14 in the container 37 is discharged, the pressing body 38 moves downward, and the locking means 44a is disengaged from the locked means 5.

The relative movement of the supported member 4 in the horizontal direction is buffered by the seismic isolation device 2.

Next, when the magnitude of the vibration becomes smaller than the predetermined value, the moving body 52 of the detecting means 46 moves from the inclined surface 49 to the pressure discharge hole 50 and closes the pressure discharge hole 50.
Then, the fluid 14 is supplied from the supply source to the container 37 via the supply hole 51 and the connection pipe 54, and the pressing body 38 is
8, the locking means 44a moves toward the locked means 5, the locking means 44a locks with the locked means 5, and returns to the state of FIG.

When the foundation 3 is twisted or displaced with respect to the supported member 4, the state shown in FIGS. 7B and 7C is obtained as in the case of the first embodiment.

In each of the first and second embodiments, the structures of the locked means, the locking means, the detecting means, and the moving means are not limited to those shown in the drawings, but may be any structure having a seismic isolation effect. I just need.

Although the detecting portion main body has an inclined surface, it may be flat. However, in the case of a flat surface, it is necessary to provide a spring on the moving body so that the moving body closes the pressure discharge hole when the vibration becomes smaller than a predetermined value.

[0046]

As described above, according to the seismic isolation structure of the present invention, when the vibration is smaller than the predetermined value, the moving means is
The locking means is pressed against and locked to the locked means provided on one of the base and the supported body. Therefore, the supported body is not rocked by the seismic isolation device against a small-scale vibration due to a gust or the like.

When the vibration exceeds a predetermined value, the vibration is detected by the detecting means, and the moving means separates the locking means from the locked means. Therefore, the seismic isolation effect can be fully exhibited.

Further, since the plurality of locking members of the locking means are urged toward the locked means by the elastic members provided on the respective locking bodies, when the vibration becomes less than a predetermined value. Even when the locking means twists or shifts with respect to the supported body, the locking body can be easily locked to the locked body.

[Brief description of the drawings]

FIG. 1 is a cutaway front view of a base isolation structure according to a first embodiment of the present invention.

FIG. 2 is a cut-away front view of the seismic isolation assist device of FIG.

FIG. 3 is a plan view cut along the line AA of FIG. 2;

FIG. 4A is a cut-away front view showing a state in which the magnitude of vibration of the detecting means of FIG. 1 is smaller than a predetermined value, and FIG.
FIG.

FIG. 5A is a cut-away front view showing a state in which the magnitude of vibration of the detection means of FIG. 1 is equal to or more than a predetermined value, and FIG.
FIG.

FIG. 6 is an explanatory view of a fluid flow path in FIG. 1;

FIG. 7A is a cutaway plan view of the seismic isolation assist device in a state where the magnitude of vibration is less than a predetermined value, and FIG. (C) shows a state where the magnitude of the vibration is equal to or more than a predetermined value,
FIG. 4 is a cut-away plan view when a displacement occurs.

FIG. 8 is a cut-away front view showing a state of the seismic isolation assist device when the vibration is smaller than a predetermined value according to the second embodiment of the present invention.

FIG. 9 is a cut-away front view showing a state of the seismic isolation assisting device when the vibration becomes a predetermined value or more from the state of FIG. 8;

FIG. 10 is a cut-away front view showing the structure of a conventional seismic isolation assist device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Seismic isolation auxiliary device, 1a ... Seismic isolation auxiliary device main body, 2 ... Seismic isolation device, 3 ... Foundation, 4 ... Building (supported body), 5 ... Locked means, 6 ... Detection means, 7 ... Movement Means, 8 ... locking means, 11
Detector main body 12 Detector 13 Slope 14 Fluid 15 Pressure discharge hole 16 Moving body 28 Locking body
36 ... seismic isolation auxiliary device main body, 44 ... locking body, 46 ... detecting means, 47 ... detecting unit main body, 48 ... detecting unit, 49 ... inclined surface,
50 ... pressure discharge holes.

Claims (3)

[Claims] A base (3) is provided with a seismic isolation device (2) for supporting a supported body (4) so as to be relatively movable in a horizontal direction, and when the base (3) vibrates less than a predetermined value. The supported body in
A seismic isolation assisting device (1) for preventing the relative movement of (4) is provided, and the seismic isolation assisting device (1) is provided on one of the foundation (3) and the supported member (4). Locked means (5) and locking means provided on the other side and engaged and disengaged with the locked means (5)
(8), detecting means (6) for detecting a vibration equal to or more than a predetermined value,
Moving means (7) for moving the locking means (8) toward and out of the locked means (5) by a pressure action of the fluid (14) based on an output signal of the detection means (6); At the time of vibration over a predetermined value,
Based on the output signal of the detecting means (6), the moving means (7
) Separates the locking means (8) from the locked means (5) and allows the relative movement of the supported body (4). 2. A locked means (5) provided on one of the base (3) and the supported body (4), and provided on the other,
Locking means (8) engaging and disengaging from the locked means (5), detecting means (6) for detecting vibration of a predetermined value or more, and detecting means (6)
Moving means (7) for moving the locking means (8) to the locked means (5) side by the pressure action of the fluid (14) based on the output signal of The detection means (6
), The moving means (7) disengages the locking means (8) from the locked means (5) and allows the relative movement of the supported body (4). A seismic isolation assist device characterized by the following. 3. The locking means (8) includes a plurality of locking bodies (28).
Is urged toward the locked means (5) by an elastic body (29) provided on each locking body (28), and when the vibration becomes less than a predetermined value, the detecting means (6) The moving means (7) advances the locking means (8) toward the locked means (5) and locks it based on the output signal of, and the relative movement of the supported body (4). The seismic isolation assist device according to claim 2, wherein the seismic isolation assisting device is prevented.