JP3009650B1 - Trigger mechanism for seismic isolation device - Google Patents

Abstract

An object of the present invention is to set a trigger level independently of a building weight, and to easily adjust the trigger level. SOLUTION: A building 3 supported on a ground 1 via a seismic isolation device, a plurality of one strips 18 having both ends fixed to the ground 1 and stacked, and a plurality of the one strips 18 are provided. A plurality of other strips 23, each of which is individually penetrated while being stacked and intersects with the plurality of one strips 18 and has both ends fixed to the building 3, and the one strip 18 and the other Strip 23
And an actuator 29 capable of pressing a crossing point with the actuator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger mechanism for a seismic isolation device in which the seismic isolation device operates at a vibration higher than a certain value or at a wind speed lower than a certain value.

[0002]

2. Description of the Related Art If a seismic isolation device does not respond to seismic waves of a certain strength or more, the building will vibrate more than necessary due to wind pressure acting on the outer wall of the building or small vibrations other than earthquakes. It gives the residents a feeling of seasickness and anxiety. To prevent this, the trigger mechanism for the seismic isolation device enables the seismic isolation device to operate with vibration above a certain value or wind speed below a certain value, and at other times to fix the seismic isolation device in a fixed state. What is used.

FIG. 8 is a longitudinal sectional view of a conventional trigger mechanism for a seismic isolation device using a frictional force.
A friction material 2 which extends long in the direction perpendicular to the plane of FIG. 8 and has a gentle concave shape in which the center of the upper surface is low and both ends are slightly high.
The lower surface of the building 3 is fixed with a friction material 4 which is elongated in the left-right direction and is curved in a gently inverted concave shape having a lower central portion and a lower center portion. The friction material 4 is supported on the ground 1 via the friction materials 4 and 3, and when the vibration acceleration of the ground 1 becomes equal to or more than the frictional force between the friction materials 2 and 4, the friction material 4 is moved together with the building 3 against the friction material 2. It is relatively displaceable (see Japanese Patent Application Laid-Open No. Hei 10-73145).

FIG. 9 is a system diagram of a trigger mechanism for a seismic isolation device using a conventional hydraulic cylinder and a sensor. The hydraulic cylinder 5 is fixed on the ground 1 and fitted to the hydraulic cylinder 5. The ends of the piston rods 7, 7 fixed to both surfaces of the piston 6 are connected to the lower surface of the building 3 supported by a seismic isolation device (not shown), and the cylinder chambers 8, 9 on both sides of the piston 6 are connected. Are connected by a pipe 11 having a flow control valve 10, and an acceleration sensor 12 is provided on the ground 1. When the vibration acceleration of the ground 1 is equal to or less than a predetermined value, the flow control valve 10 closes to lock the movement of the piston 6. The horizontal displacement of the building 3 with respect to the ground 1 is restricted, and when the vibration acceleration of the ground 1 exceeds a certain value, the flow control valve 10 is opened by the control device 13 so that the piston 6 and the piston rod 7 As to be displaceable, building 3 is obtained so as to be displaced horizontally relative to the ground 1 (see Japanese Patent Laid-Open No. 2-289769).

[0005] Fig. 10 is a front view of a conventional trigger mechanism for a seismic isolation device using inertial force. A pillar 14 is vertically provided on the ground 1 and is supported by a seismic isolation device (not shown). A pillar 15 having the same cross-section as the pillar 14 is vertically fixed to the lower surface of the building 3 facing the pillar 14 on the ground 1, and an annular lock member is provided on the facing portion of the pillars 14, 15. 16 and the lower surface of the building 3 and the upper surface of the locking member 16
7a and 17b are attached, and the support members 17a and 17b are always used.
When the lock member 16 locks the relative displacement of the pillars 14 and 15 by surrounding the outside of the opposing portions of the pillars 14 and 15 due to the suction, the inertial force of the lock member 16 when the ground 1 vertically vibrates more than a certain level. As shown in FIG.
a, 17b are detached, the lock member 16 falls, and the ground 1
In this case, the building 3 can be relatively displaced in the horizontal direction (see Japanese Patent Application Laid-Open No. 10-38021).

[0006]

The conventional trigger mechanism for a seismic isolation device using a frictional force shown in FIG.
The friction force between them is used as a trigger to activate the seismic isolation device when the vibration exceeds a certain value. In this case, the trigger level (horizontal sliding load) is determined by the weight of the building 3 and the friction coefficient between the friction members 2 and 4.

On the other hand, since the friction coefficient between the friction members 2 and 4 affects the seismic isolation performance, only the trigger level cannot be set independently. This is because the seismic isolation performance takes precedence and the trigger level becomes incidental. Further, since the friction coefficient between the friction members 2 and 4 is mainly determined by the material and the surface roughness thereof, the range of the friction coefficient is limited, and it is difficult to adjust the friction coefficient to an optimum state.

The conventional trigger mechanism for a seismic isolation device using a hydraulic cylinder and a sensor shown in FIG. 9 controls a hydraulic system, so that a trigger value (a certain acceleration value in this case) can be freely adjusted. However, there was a problem that the mechanism was complicated and expensive.

The conventional trigger mechanism for the seismic isolation device using inertial force shown in FIGS. 10 and 11 is low in cost because of its simple structure, but utilizes the detachment of the trigger value by the inertial force of the lock member 16. Therefore, when multiple trigger mechanisms for seismic isolation devices are provided, there is a possibility that the operation will be unstable and unstable, and if the residual displacement occurs in the building 3 after the end of the earthquake There is a problem that the columnar members 14 and 15 are displaced and cannot be fixed again.

The present invention solves such a problem, and the trigger level (horizontal sliding load) can be set independently of the weight of the building, the adjustment is simple, and the residual displacement of the building after the earthquake is over. It is an object of the present invention to provide a trigger mechanism for a seismic isolation device that can be used as a trigger or a friction damper by using a signal of a certain value or more from a sensor without causing a problem of re-fixing even when a problem occurs. It is.

[0011]

According to the first aspect of the present invention, there is provided a building supported on the ground via a seismic isolation device, a plurality of one strips fixed at both ends to the ground and stacked. A plurality of other strips that are individually penetrated between the stacked portions of the plurality of one strips, intersected with the plurality of one strips, and both ends of which are fixed to the building; An actuator that can always press the intersection of the strip and the other strip,
A trigger mechanism for seismic isolation devices characterized by the following features: By adjusting the number of laminated strips, the trigger level can be set independently of the weight of the building, and the end of the earthquake Even when a residual displacement occurs in the building later, the same trigger level as in the initial stage can be secured at the intersection of one strip and the other strip.

According to a second aspect of the present invention, an acceleration sensor for controlling an actuator is installed on the ground, and when the vibration acceleration of the ground is equal to or less than a predetermined value, the actuator presses the intersection of one of the strips and the other strip. When the vibration acceleration of the ground exceeds a certain value, the pressing of the intersection between one of the band plates and the other band plate by the actuator is released, and the other band plate is released. 2. The trigger mechanism for a seismic isolation device according to claim 1, wherein the band plate and the other band plate are set in a free state, and are released when the vibration acceleration of the ground exceeds a certain value by an acceleration sensor. The seismic device will be able to work.

According to a third aspect of the present invention, an acceleration sensor for controlling the actuator is installed on the ground, and when the vibration acceleration of the ground is equal to or less than a predetermined value, the actuator presses the intersection of one of the strips and the other strip. When the vibration acceleration of the ground exceeds a certain value, the pressing force of the actuator at the intersection of the one and the other strips is reduced to a low pressure when the vibration acceleration of the ground exceeds a certain value. The trigger mechanism for a seismic isolation device according to claim 1, wherein one of the strips and the other strip are slidable by friction. By adjusting the kinetic frictional force of the sliding motions, it becomes possible to function as a friction damper when vibrating due to an earthquake.

According to a fourth aspect of the present invention, a wind speed sensor for controlling an actuator is mounted on a building, and when the wind speed is equal to or higher than a predetermined value, the actuator presses the intersection of one of the strips and the other of the strips so that one of the strips is pressed. The band plate and the other band plate are fixed, and when the wind speed is less than a certain value, the pressing of the intersection between the one band plate and the other band plate by the actuator is released, and the one band plate and the other band plate are released. The triggering mechanism for a seismic isolation device according to claim 1, wherein the building is prevented from vibrating more than necessary due to wind pressure.

According to a fifth aspect of the present invention, a wind speed sensor for controlling an actuator is attached to a building, and when the wind speed is equal to or higher than a predetermined value, the actuator presses an intersection of one of the strips and the other strip to thereby press one of the strips. The band plate and the other band plate are fixed, and when the wind speed is less than a certain value, the pressing force at the intersection of the one band plate and the other band plate by the actuator is reduced to a low pressure, so that one band plate and the other band plate are pressed. 2. A trigger mechanism for a seismic isolation device according to claim 1, wherein the band plate and the band plate are capable of frictional sliding. It can be adjusted to function as a friction damper when vibrating due to wind.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of an example of the embodiment of the present invention viewed from II in FIG. 5, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 5 is a plan view of an example of the embodiment of the present invention. In the drawings, a plurality of strips 18 made of steel such as an SPCC steel strip are disposed in the left-right direction of these figures, and as shown in FIG. Between the strips 1
A plurality of strips 18 are vertically stacked with a thin plate spacer 19 made of SS400 steel plate or the like having the same thickness as that of the strip 8 interposed therebetween.

A reinforcing plate 20 having the same planar shape as that of the band plate 18 is stacked on the laminated band plate 18 with a thin plate spacer 19 interposed therebetween, and at both ends of the band plate 18 and the reinforcing plate 20, Strip 18, thin plate spacer 19, reinforcing plate 2
0 is a column 2 fixed vertically on the ground 1 with anchor bolts
A fixing bolt 22 (see FIG. 1, FIG. 2, FIG. 5)
It is fixed at.

FIG. 3 is a side view of one example of the embodiment of the present invention as viewed from III-III in FIG. 5, and as shown in FIGS. In the center portion, the other plural band plates 23 are individually penetrated in a direction intersecting at right angles between the band plates 18 stacked.

The strip 23 is made of steel such as an SPCC steel strip and has substantially the same dimensions as the strip 18, and is stacked vertically so that the center of the strip 18 is stacked as described above.
3 and penetrates at right angles between the center portions of the plurality of band plates 23, as shown in FIG. 4, which is a partially enlarged view of FIG. The plurality of strips 23 are vertically stacked with a thin plate spacer 24 made of SS400 steel plate or the like interposed therebetween.

A reinforcing plate 25 having the same planar shape as the band plate 23 is laid on the laminated band plate 23 with a reinforcing plate spacer 26 made of SS400 steel plate or the like interposed therebetween. And at both ends of the reinforcing plate 25,
3, thin plate spacer 24, reinforcing plate 25, reinforcing plate spacer 2
6 is fixed to a lower end of a column 27 fixed vertically to the lower surface of the building 3 with fixing bolts 28.

FIG. 6 is an enlarged cross-sectional view taken along the line VI-VI of FIG. 5, and below the place where the strips 18 and 23 intersect,
An actuator 29 that presses the intersection of the strips 18 and 23 from below is provided. The illustrated embodiment of the actuator 29 includes a balloon 30 that expands and contracts by supplying and discharging compressed air. As shown in FIGS. 1, 3, and 5, a slide upper plate 31 is provided at an upper portion where the band plates 18 and 23 intersect, and a lower surface of the slide upper plate 31 is arranged as shown in FIG. The lubricating material 32 is fixed and mounted on the uppermost reinforcing plate 25 at the intersection of the strips 18 and 23 as shown in FIG.

As shown in FIG. 5, a rectangular slide upper plate 3
Four suspending bolts 33 are suspended from the four corners of 1 so as to sandwich the intersection of the band plate 18 and the reinforcing plate 20 with the band plate 23 and the reinforcing plate 25. Is
As shown in FIGS. 1, 3 and 6, the holding plate 34 is held so as to be separated downward from the intersection of the strips 18 and 23.

As shown in FIG. 6, a balloon 30 constituting the actuator 29 is mounted on the holding plate 34. On the upper surface of the balloon 30, a pressing plate 36 having a pressing projection 35 at the center is provided. The four corners of the pressing plate 36 are slidably fitted to four suspension bolts 33 suspended from the four corners of the upper plate 31.
A connector 37 for supplying and discharging compressed air is attached to the lower surface of the balloon 30 through the holding plate 34.

Around the lower side of the intersection of the strips 18 and 23,
A slide lower plate 39 to which a lubricant 38 is fixed is disposed on the upper surface, and the lubricant 3 on the upper surface of the slide lower plate 39 is provided.
The four corners of the slide lower plate 39 are fixed to the four suspension bolts 33 in a state where 8 is lightly in contact with the lower surface of the lowermost band plate 23. An opening 40 into which the pressing protrusion 35 of the pressing plate 36 can freely fit is formed in the center of the slide lower plate 39 and the lubricant 38.

FIG. 7 is a front view showing a use state of the present invention. The building 3 is supported on the ground 1 via a seismic isolation device 41, and the lower surface of the building 3 Both ends of the band plate 23 are fixed by the columns 27 described in 3. An actuator control device 43 having a pressurized air supply source 42 is provided inside the building 3, and the pressurized air supply source 42 is connected via a pipe 44 to a balloon 30 constituting the actuator 29 (see FIG. 6). Is connected to the connector 37.

Further, as shown in FIG. 7, an acceleration sensor (earthquake sensor) 45 is installed on the ground 1 and a wind speed sensor 46 is installed on the outer wall of the building 3 to measure the acceleration and wind speed of the ground 1 respectively. Input to the actuator control device 43. Actuator control device 43
Controls the pressure of the pressurized air supplied to the actuator 29 in three stages of atmospheric pressure, intermediate pressure, and constant value high pressure, as described later, according to the measurement values input from the acceleration sensor 45 and the wind speed sensor 46. You can do it. Next, the operation of the above-described device will be described.

When the acceleration sensor 45 shown in FIG. 7 does not detect acceleration, the actuator control device 43 supplies a constant high-pressure air to the balloon 30 (see FIG. 6) constituting the actuator 29 to inflate the balloon 30. Then, the pressing plate 36 is raised to press the intersection of the band plates 18 and 23 by the pressing protrusion 35 at the center of the pressing plate 36. Thereby, the strips 18 and 23 are fixed to each other, and the displacement of the building 3 with respect to the ground 1 is restrained. At this time, the number of the strips 18 and 23 and the pressing force of the actuator 29 are adjusted so that the restraining force on the building 3 is sufficient to suppress the vibration of the building 3 due to strong wind.

When an acceleration in an arbitrary direction occurs on the ground 1 due to the occurrence of an earthquake, the acceleration sensor 45 measures the acceleration and inputs it to the actuator control device 43. When the measured value input from the acceleration sensor 45 to the actuator control device 43 is equal to or higher than a certain level, the actuator control device 43 discharges the air in the balloon 30 to make the inside of the balloon 30 atmospheric pressure. As a result, the balloon 30 is deflated and the pressing plate 36 descends, so that the intersection of the strips 18 and 23 is not pressed. Accordingly, one of the plurality of strips 18 and the other of the plurality of strips 23 intersecting with each other can freely move with respect to each other, and the building 3 is in a free state with respect to the ground 1 and is isolated from the ground. The device 41 can absorb the seismic vibration.

When a certain period of time has elapsed after the ground 1 has stopped vibrating, the actuator control device 43 supplies high-pressure air to the balloon 30. As a result, the balloon 30 is inflated to raise the pressing plate 36, and the band plates 18, 2
By pressing the intersection of 3, the displacement of the building 3 with respect to the ground 1 is restricted.

Even if the relative position between the ground 1 and the building 3 does not return to the original position before the vibration after the end of the vibration and a residual displacement occurs, the restraining force of the displacement of the building 3 with respect to the ground 1 is still a band plate. 18 and 23, the coefficient of friction between the strips 18 and 23, and the pressing force of the actuator 29.
Even if the intersection of 8, 23 is different from the original position, the binding force on the building 3 does not change.

When the measured value inputted from the acceleration sensor 45 to the actuator control device 43 is equal to or higher than a certain level, the balloon 30 is controlled by the actuator control device 43.
It is also possible to supply intermediate pressure air that is lower than a certain high pressure. At this time, the pressing plate 36 is
23 is a weak force, and therefore, the band plate 1
Numerals 8 and 23 frictionally slide with each other and slide while receiving the frictional force, so that the vibration of the building 3 is gradually attenuated.

When the wind speed sensor 46 measures the wind speed exceeding the trigger level (horizontal sliding load) of the strips 18 and 23 due to the strong wind, the actuator control device 43 sends a constant high pressure air to the balloon 30 (FIG. 6). ), The balloon 30 is inflated, the pressing plate 36 is raised, and the intersection of the strips 18 and 23 is pressed. As a result, the strips 18 and 23 are fixed to each other, and the displacement of the building 3 with respect to the ground 1 is restrained.
Does not vibrate.

When the wind stops and the wind speed falls below the trigger level, the actuator control device 43 discharges the air in the balloon 30 to bring the inside of the balloon 30 to atmospheric pressure. As a result, the balloon 30 is deflated and the pressing plate 36 descends, so that the intersection of the strips 18 and 23 is not pressed.
Therefore, one of the plurality of strips 18 and the other of the plurality of strips 23 intersecting with each other can freely move with respect to each other, and the building 3 is in a free state with respect to the ground 1.

When the wind speed measured by the wind speed sensor 46 becomes equal to or lower than the trigger level, the actuator control device 43 can supply the balloon 30 with intermediate pressure air lower than a fixed high pressure. . At this time, since the force of the pressing plate 36 pressing the intersection of the strips 18 and 23 is a weak force, the strips 18 and 23 frictionally slide with each other and slide while receiving the frictional force. Vibration is gradually attenuated.

When the vibration caused by the strong wind and the vibration caused by the earthquake occur simultaneously and the wind speed becomes strong enough to give the building 3 a vibration exceeding the allowable displacement of the seismic isolation device 41, the acceleration sensor 45 measures Even if the value is small, the actuator control device 4
3 supplies high-pressure air to the balloon 30 and
8 and 23 can be fixed to each other to restrain the displacement of the building 3 with respect to the ground 1.

In the illustrated embodiment, a balloon 30 that expands and contracts by supplying and discharging compressed air is used as the actuator 29.
It is possible to use a device that generates a pressing force by a mechanism operated by hydraulic pressure or electricity. Also, the strips 18 and 2
Reference numeral 3 is not limited to steel such as SPCC steel strip, but may be another strip having the same rigidity as this steel strip, for example, an engineering plastic plate.

[0037]

According to the first aspect of the invention, the trigger level (horizontal sliding load) can be set independently of the weight of the building by adjusting the number of laminations of the strips. Even if a residual displacement occurs later in the building, the same trigger level as the initial one can be secured at the intersection of one of the strips and the other.

According to a second aspect of the present invention, when the vibration acceleration of the ground measured by the acceleration sensor exceeds a predetermined value, the fixing of one of the strips to the other strip is released to allow the building to freely move with respect to the ground. And the seismic isolation device can absorb seismic vibration. The invention of claim 3 is
There is an effect that the kinetic frictional force of sliding between one strip and the other strip can be adjusted to function as a friction damper when vibrating due to an earthquake. The invention according to claim 4 has an effect that it is possible to prevent a building from vibrating more than necessary due to wind pressure in a strong wind. The invention according to claim 5 has an effect that the kinetic frictional force of sliding between one band plate and the other band plate can be adjusted to function as a friction damper at the time of vibration by wind.

[Brief description of the drawings]

FIG. 1 is a front view of an example of an embodiment of the present invention as viewed from II in FIG.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a side view of one example of the embodiment of the present invention as viewed from III-III in FIG. 5;

FIG. 4 is a partially enlarged view of FIG. 3;

FIG. 5 is a plan view of an example of an embodiment of the present invention.

FIG. 6 is an enlarged sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is a front view showing a use state of the present invention.

FIG. 8 is a longitudinal sectional view of a conventional trigger mechanism for a seismic isolation device using frictional force.

FIG. 9 is a system diagram of a trigger mechanism for a seismic isolation device using a conventional hydraulic cylinder and a sensor.

FIG. 10 is a front view of a conventional seismic isolation device trigger mechanism using inertial force.

11 is a front view showing an operation state of the trigger mechanism for the seismic isolation device of FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground 3 Building 18 Strip 23 Strip 29 Actuator 41 Seismic isolation device 45 Acceleration sensor 46 Wind speed sensor

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keiji Yamagata 3-5-3 Tatsumi, Koto-ku, Tokyo Mitsubishi Steel Corporation Environmental Engineering Division (56) References Jikai Sho 64-25541 (JP, U) ( 58) Fields surveyed (Int.Cl. ⁷ , DB name) E04H 9/02 331 F16F 15/02

Claims (5)

(57) [Claims] 1. A structure supported on the ground via a seismic isolation device, a plurality of one strips fixed at both ends to the ground and stacked, and the plurality of one strips stacked. A plurality of other strips which are individually penetrated between and intersect with the plurality of one strips and both ends of which are fixed to the building; and intersections between the one strip and the other strip. And an actuator capable of constantly pressing the trigger. 2. An acceleration sensor for controlling an actuator is installed on the ground, and when the vibration acceleration of the ground is equal to or lower than a predetermined value, the actuator presses an intersection of one of the strips and the other strip to thereby form one of the strips. And the other band plate in a fixed state, and when the vibration acceleration of the ground exceeds a certain value, the pressing of the intersection between the one band plate and the other band plate by the actuator is released, and the one band plate and the other band plate are released. 2. The trigger mechanism for a seismic isolation device according to claim 1, wherein the band plate is set in a free state. 3. An acceleration sensor for controlling an actuator is installed on the ground, and when the vibration acceleration of the ground is equal to or less than a predetermined value, the actuator presses an intersection between one of the strips and the other strip to thereby form one strip. And the other band plate in a fixed state, and when the vibration acceleration of the ground exceeds a certain value, the pressing force at the intersection of the one band plate and the other band plate by the actuator is set to a low pressure, and the one band plate is 2. The trigger mechanism for a seismic isolation device according to claim 1, wherein the other belt plate is slidably slidable. 4. A wind speed sensor for controlling an actuator is mounted on a building, and when the wind speed is equal to or higher than a certain value, an intersection of one of the strips and the other is pressed by the actuator to thereby make one of the strips and the other one. When the wind speed is less than a certain value, the pressing of the actuator at the intersection of the one strip and the other strip is released, and the one strip and the other strip are set in the free state. The trigger mechanism for a seismic isolation device according to claim 1, wherein 5. A wind speed sensor for controlling an actuator is mounted on a building, and when the wind speed is equal to or higher than a predetermined value, an actuator presses an intersection between one of the strips and the other strip, and the one strip and the other strip are pressed. When the wind speed is less than a certain value, the pressing force of the actuator at the intersection of one of the strips and the other is set to a low pressure so that the one and the other strips are in friction. 2. The trigger mechanism for a seismic isolation device according to claim 1, wherein the trigger mechanism is slidable.