JPH11270184A - Seismic isolation device - Google Patents

Abstract

(57) [Abstract] [Problem] To improve the durability while simplifying the main structure of a seismic isolation system and reducing the cost, and to give priority to seismic isolation when an earthquake occurs under strong wind. SOLUTION: The seismic isolation bearing means 3 interposed between the building 1 and the ground 2 to prevent the rolling of the ground 2 from propagating to the building 1, and the interposition between the building 1 and the ground 2 Then, an oil damper 5 controlled to an unlocked state or a locked state by opening and closing the oil passage 17 by the solenoid valve 4 and an oil damper lock switch 11 are provided, and the solenoid valve 4 is operated by operating the oil damper lock switch 11.
When power is supplied to the solenoid valve 4, the timer 12 starts counting time, and after the set time elapses, the power supply to the solenoid valve 4 is cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device, and more particularly to a seismic isolation device suitable for use in a small building such as a detached general house.

[0002]

2. Description of the Related Art Conventionally, a seismic isolation device shown in FIG. 5, for example, has been proposed as a seismic isolation device for preventing the lateral movement of the ground during an earthquake from being transmitted to a building.

[0003] This is based on the assumption that a ball isolator 3 is provided between the building 1 and the ground 2 as seismic isolation bearing means for preventing the rolling of the ground 2 from propagating to the building 1. A pedestal plate 3a installed on the ground 2, a ball 3b rotatably mounted on the pedestal plate 3a, and a lower portion of the building 1 provided to rotatably hold the ball 3b. Support member 3
c.

The pedestal plate 3a has a conical or arcuate ball rolling surface P whose depth gradually decreases from the center to the periphery.
The ball 3b is mounted on the top so as to freely roll.

[0005] Between the building 1 and the ground 2, an oil damper 5 which is controlled to an unlocked state or a locked state by opening and closing an oil path by a solenoid valve 4 is interposed, and a roof 1 a of the building 1 is provided. An anemometer 6 is installed on the top of the vehicle, and a signal detected by the anemometer 6 can be input to a controller 7 installed in the building 1.

The controller 7 is provided with a control circuit for processing a detection signal from the anemometer 6 and outputting a drive signal to the solenoid valve 4. The control circuit includes a rectifier for supplying DC power to the control circuit. 8 are connected. 9
Is a plug with a cord for supplying commercial AC power to the rectifier 8.

In such a conventional seismic isolation device, the controller 7 stops supplying current to the solenoid valve 4 because the output signal level of the anemometer is small during normal times when the wind force is small. The locked state is unlocked and the state is ready for seismic isolation in the event of an earthquake.

Therefore, when an earthquake occurs in such a state, the ball 3 of the ball isolator 3
By rolling b on the pedestal plate 3a, it is possible to suppress the roll of the ground 2 from propagating to the building 1.

On the other hand, when the anemometer 6 detects a wind force exceeding the set intensity that shakes the building 1, the controller 7 outputs an operating current to the solenoid valve 4 based on the detection output. Therefore, the oil path corresponding to the oil damper 5 is closed, the state changes from the unlocked state to the locked state, and the movement of the building 1 with respect to the ground 2 is locked.

On the other hand, when the wind weakens and the wind falls below the set level, the switching operation of the solenoid valve 4 based on the output of the anemometer 6 causes the oil damper to return to the unlocked state again. It will return to the standby state in preparation for the seismic isolation operation at the time.

[0011]

However, in such a conventional seismic isolation device, a solenoid valve that controls opening and closing of an oil passage of an oil damper is controlled by an output signal from an anemometer that changes according to the wind speed. Since such a configuration is employed, a rectifier 8 that supplies DC power to control devices such as the controller 7 in addition to the anemometer 6 is required, and there is a problem that the configuration is complicated and the cost is inevitably increased.

Further, the anemometer 6 is installed so as to be constantly exposed to the outdoors. In particular, since the mechanically moving parts are constantly exposed to the natural environment, the anemometer 6 is inferior in durability and uneasy for long-term use. There was a problem that remains.

Further, when an earthquake occurs in a strong wind, that is, when the oil damper 5 is locked as described above, there is a problem that the seismic isolation function may not be sufficiently performed. Was.

[0014] The present invention solves the above-described problems, and can simplify the main structure of the seismic isolation system, and install the main structure inside a building, thereby reducing the cost and improving durability. It is an object of the present invention to obtain a seismic isolation device that can improve seismic performance and give priority to seismic isolation when an earthquake occurs in a strong wind, thereby preventing damage or collapse of buildings.

[0015]

According to a first aspect of the present invention, there is provided a seismic isolation device which is interposed between a building and the ground so that the ground shakes on the building. Seismic isolation bearing means to prevent propagation, an oil damper interposed between the building and the ground, which is controlled to unlock or lock by opening and closing an oil path by a solenoid valve, and an oil operated in a strong wind An oil damper lock switch that controls the damper to be locked by a solenoid valve is provided.When energizing the solenoid valve by operating the oil damper lock switch, the timer starts counting time, and after the set time elapses, the solenoid valve is turned on. Is turned off.

According to a second aspect of the present invention, in addition to the above-described structure, the seismic sensor for detecting an earthquake is provided in addition to the above-mentioned configuration, so that the seismic sensor is provided after the energization of the solenoid valve is started and before the set time elapses. When an earthquake is detected, the energization of the solenoid valve is immediately cut off.

According to a third aspect of the present invention, in the seismic isolation device, the oil damper lock switch and the timer are installed inside the building.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram showing the entire configuration of a seismic isolation device of the present invention. Building 1 and foundation 2 such as concrete formed on ground 2
a, and a plurality of ball isolators 3 as seismic isolation bearing means for preventing the shaking of the ground 2 from propagating to the building 1.

These ball isolators 3 are composed of a base 2
a base plate 3a installed on the base plate 3a, a ball 3b rotatably mounted on the base plate 3a, and a support provided at a lower portion of the building 1 so as to rotatably hold the ball 3b. 3c.

The pedestal plate 3a has a conical or arcuate ball rolling surface P whose depth gradually decreases from the center toward the periphery.
The ball 3b is placed thereon.

A plurality of oil dampers 5 are provided between the building 1 and the ground 2 and controlled to be in an unlocked state or a locked state by opening and closing an oil passage by a solenoid valve 4.

The oil damper 5 and the solenoid valve 4 are configured, for example, as shown in FIG. Of these, the oil damper 5 is a cylinder 5
a is fixed to the foundation 2a side, and a piston rod 5c integral with a piston 5b that separates the inside of the cylinder 5a into two oil chambers A and B is fixed to the building 1 side.

On the other hand, the solenoid valve 4 is a normal on / off solenoid valve, and is connected to the middle of an oil passage 17 connecting the oil chambers A and B of the cylinder 5a.
The oil chambers A and B communicate with each other, and function to shut off the oil chambers A and B when current is supplied thereto.

A power distribution panel 10 is installed in the building 1. The power distribution panel 10 is provided with an oil damper lock switch 11, a timer 12, an earthquake sensor 13, and the like, which are turned on by a person in a strong wind. ing. In addition, the earthquake sensor 13 does not necessarily need to be provided in the distribution board 10, and may be provided in any of the building 1, the foundation 2a, etc. as long as the position detects the earthquake with high sensitivity.

Reference numeral 14 denotes a power supply such as a commercial AC power supply. The power (current) of the power supply 14 is branched and connected to a terminal box 15 via an oil damper lock switch 11 of the distribution board 10 and a cable 16. It can be supplied to each one of the solenoid valves 4.

As the timer 12, a timer switch connected in series to the oil damper lock switch 11, a timer switch for turning on and off the oil damper lock switch 11 itself at a set timing, and the like are used.

This allows the timer 12 to start measuring the time when the solenoid valve 4 is energized by operating the oil damper switch 11, and to shut off the energization to the solenoid valve 4 after a lapse of a set time.

Next, the operation will be described with reference to the flow charts of FIGS. 3 and 4. The seismic isolation device provided in a general detached house has a small resistance to movement in the lateral direction, so that a large cross wind is generated. The building moves when you receive it. However, it has been confirmed by calculations and experiments that the above-mentioned movement resistance does not cause easy movement when the wind speed is about 15 to 20 m / sec.

Therefore, even if the oil damper 5 is locked when a person feels a strong wind of a predetermined level or more when receiving a crosswind, the timing of preventing the abnormal movement of the building 1 can be reduced. Be good enough.

First, the operation of the oil damper 5 under conditions where the earthquake sensor 13 is not provided or not used will be described with reference to FIG. First, in a case where the building 1 receives a crosswind, when a person judges that the strength of the crosswind has sensuously exceeded a set level, the oil damper lock switch 11 is pressed (step S1).

Thus, power is supplied from the power supply 14 to the respective solenoid valves 4 via the oil damper lock switch 11 and the terminal box 15, and these solenoid valves 4 cut off the oil passage 17 as shown in FIG. Is switched as follows. Therefore, the oil damper 5
Is locked (step S2), the movement of the building 1 with respect to the ground 2 is prevented, and the building 1 does not swing or vibrate in the horizontal direction even if it receives a crosswind.

When the locking operation of the oil damper 5 is started, the timer 12 starts counting time (step S3), and the timer 12 is predicted to stop for a predetermined time, that is, to stop the crosswind. When the time has elapsed (step S4), for example, the oil damper lock switch 11 is turned off.

As a result, the supply of current from the power source 14 to the solenoid valve 4 is cut off, the cutoff of the oil passage 17 by the solenoid valve 4 is released, and the movement of the piston rod 5c with respect to the cylinder 5a becomes free (step S5). ). For this reason, if an earthquake occurs after the elapse of the set time, the ball isolator 3 performs the seismic isolation operation. In a state where the oil damper lock switch 11 is not operated (step S1), since no current is supplied to the solenoid valve 4, the movement of the oil damper 5 becomes free and the seismic isolation enabled state is maintained.

On the other hand, the operation of the oil damper 5 under the condition where the earthquake sensor 13 is provided is as shown in FIG. According to this, the oil damper 5 receives the crosswind as described above.
Is locked, if the earthquake sensor 3 detects an earthquake before the set time elapses (step S6), the solenoid valve 4 is immediately turned on so that the oil damper 5 can be freely operated. Cut off the current supply.

As a result, even if the building 1 is locked against the ground 2 so that the building 1 does not roll due to the crosswind, if an earthquake occurs, the lock is released and the ground 1 is released. 2. Make the building swingable. This allows
The seismic isolation function can be executed in priority to the prevention of shaking due to the crosswind.

[0036]

As described above, according to the first aspect of the present invention, seismic isolation bearing means interposed between the building and the ground to prevent the rolling of the ground from propagating to the building, An oil damper that is interposed between the ground and is controlled to be unlocked or locked by opening and closing an oil path by a solenoid valve, and an oil damper lock that is operated in strong winds to control the oil damper to be locked by a solenoid valve A switch is provided, and when the solenoid valve is energized by operating the oil damper lock switch, the timer is started and the energization of the solenoid valve is cut off after a lapse of a set time. Without using large and expensive components such as control equipment and rectifiers, oil damper lock switches and The simple structure of providing a timer and a timer makes it possible to prevent the building from swaying under strong crosswinds easily and at low cost, and the use of a timer has the effect of not forgetting to unlock the oil damper. .

According to the second aspect of the present invention, an earthquake sensor for detecting an earthquake is provided, and when an earthquake is detected after the energization of the solenoid valve and before the set time elapses, the solenoid is immediately turned on. Since the valve is configured to cut off the current, even when the crosswind is strong and the oil damper is locked to keep the building from shaking against the ground, immediately release the hold when an earthquake occurs. Therefore, an effect is obtained that the seismic isolation effect by the intended seismic isolation bearing means can be executed with priority.

According to the third aspect of the present invention, since the oil damper lock switch and the timer are arranged inside the building, they are not directly exposed to the outside. Compared to the one used,
The effect is obtained that the durability of the entire seismic isolation device is greatly improved.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a seismic isolation device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a hydraulic circuit of an oil damper and a solenoid valve in FIG. 1;

FIG. 3 is a flowchart showing a seismic isolation control procedure according to the present invention.

FIG. 4 is a flowchart showing another seismic isolation control procedure according to the present invention.

FIG. 5 is a conceptual diagram showing a conventional seismic isolation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Building 2 Ground 3 Ball isolator as seismic isolation support means 4 Solenoid valve 5 Oil damper 11 Oil damper lock switch 12 Timer 13 Earthquake sensor

Claims (3)

[Claims] 1. A seismic isolation bearing means interposed between a building and the ground to prevent rolling of the ground from propagating to the building, and an oil passage interposed between the building and the ground and provided by a solenoid valve The oil damper is controlled to unlock or lock by opening and closing the oil damper, the oil damper lock switch is operated in strong wind to control the oil damper to be locked by the solenoid valve, and the solenoid valve is operated by operating the oil damper lock switch. A timer that starts timing when power is supplied to the solenoid valve and shuts off power to the solenoid valve after a set time has elapsed. 2. A seismic isolation bearing means interposed between the building and the ground to prevent the rolling of the ground from propagating to the building, and an oil passage interposed between the building and the ground and provided by a solenoid valve The oil damper is controlled to unlock or lock by opening and closing the oil damper, the oil damper lock switch is operated in strong wind to control the oil damper to be locked by the solenoid valve, and the solenoid valve is operated by operating the oil damper lock switch. A timer that starts timing when power is supplied to the solenoid valve and shuts off power to the solenoid valve after a lapse of a set time, and an earthquake sensor that detects an earthquake is provided. A seismic isolation device that immediately shuts off power to the solenoid valve when an earthquake is detected before the elapse. 3. The seismic isolation device according to claim 1, wherein the oil damper lock switch and the timer are installed inside the building.