JP2014167331A - Attenuation force change-over seismic base isolation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a configuration of a base isolation system and restrict its manufacturing cost to an inexpensive price.SOLUTION: An attenuation force change-over base isolation system 10 comprises a plurality of hydraulic dampers 20 (20to 20), attenuation force change-over solenoid valves (30to 30), a seismoscope 40 for low acceleration, a seismoscope 50 for high acceleration, a control circuit 60 and a power source 70. When the seismoscope 40 for low acceleration detects lower acceleration than a prescribed value, the control circuit 60 turns on a solenoid valve change-over signal outputted with respect to each of the attenuation force change-over solenoid valves 30. Each of the attenuation force change-over solenoid valves 30 changes over an attenuation coefficient of dampers 20 to a low attenuation coefficient CL. When the seismoscope 50 for high acceleration detects higher acceleration than a prescribed value, the control circuit 60 changes over a solenoid valve change-over signal to off with respect to each of the attenuation force change-over solenoid valves 30. Each of the attenuation force change-over solenoid valves 30 changes over an attenuation coefficient of each of the hydraulic dampers 20 to a high attenuation coefficient CH.

Description

  The present invention relates to a damping force switching seismic isolation system.

  For example, as a building seismic isolation device, a ball isolator that is interposed between the foundation and the building and suppresses the response to the building against earthquake motion is installed between the foundation and the building. A damper, a switching solenoid valve that switches the damping force of the damper, an earthquake detector that is installed on the foundation to detect earthquake motion, a limit switch (position detection means) that detects the relative position between the foundation and the building, and an earthquake There is a device that controls a damping force of a damper by calculating a control signal for switching a switching electromagnetic valve so as to increase the damping force based on each signal from a detector and a limit switch (see, for example, Patent Document 1). .

JP-A-9-264376

  Since the conventional seismic isolation device calculates the control signal for switching the switching solenoid valve so as to increase the damping force based on the signals from the earthquake detector and the limit switch, the calculation processing is complicated. This increases the burden of calculation in the control circuit and requires multiple detection means such as an earthquake detector and a limit switch, resulting in high manufacturing costs and labor for wiring signal lines with each device. There was a problem that it took.

  Therefore, in view of the above circumstances, an object of the present invention is to provide a damping force switching seismic isolation system that solves the above problems.

  In order to solve the above problems, the present invention has the following means.

The present invention includes a damper that generates a damping force that attenuates acceleration input to a structure;
A damping force switching solenoid valve for switching the damping force of the damper;
A seismometer that outputs an earthquake detection signal when the vibration caused by the earthquake reaches a predetermined vibration state;
When an earthquake detection signal is input from the seismic device, output means for outputting a switching signal for switching the damping force switching electromagnetic valve;
It is provided with.

  According to the present invention, when the earthquake detection signal is input from the seismic device, the switching signal for switching the damping force switching electromagnetic valve is output, so that the burden of the arithmetic processing of the control means is reduced and each detection means Therefore, the manufacturing cost can be reduced and the wiring work of signal lines with each device can be simplified.

It is a figure which shows Embodiment 1 of the damping force switching seismic isolation system by this invention. It is a flowchart for demonstrating the seismic isolation control process 1 of Embodiment 1. FIG. It is a figure which shows Embodiment 2 of the damping force switching seismic isolation system by this invention. 6 is a flowchart for explaining seismic isolation control processing 2 of the second embodiment. It is a figure which shows Embodiment 3 of the damping force switching seismic isolation system by this invention. 10 is a flowchart for explaining a procedure of seismic isolation control according to the third embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

Embodiment 1
FIG. 1 is a diagram showing Embodiment 1 of a damping force switching seismic isolation system according to the present invention. As shown in FIG. 1, the damping force switching seismic isolation system 10 is a system that isolates a building (structure) from earthquake vibrations, for example, and includes a plurality of hydraulic dampers 20 (20 _{1 to} 20 _n ), A damping force switching solenoid valve 30 (30 ₁ to 30 _n ), a low acceleration seismic device (first seismic device) 40, a high acceleration seismic device (second seismic device) 50, A control circuit (output means) 60 and a power source 70 are included.

  Each hydraulic damper 20 is attached to a location that is relatively displaced by an acceleration caused by an earthquake, such as a beam or a wall of a building. Each hydraulic damper 20 includes a cylinder 22 filled with hydraulic oil and a piston rod 24 that reciprocates according to acceleration input from the outside. A piston that slides in the cylinder 22 is attached to the end of the piston rod 24, and the piston is provided with a damping force generator that generates a damping force by a throttle through which hydraulic oil passes. .

Each damping force switching electromagnetic valve 30 is a normally closed electromagnetic valve that switches a flow path communicating with the cylinder 22 when an earthquake detection signal is input, and includes a control circuit 60 and signal lines 62 (62 _{1 to} 62 _n ). Is electrically connected. Therefore, each damping force switching electromagnetic valve 30 is switched between a seismic isolation mode in which a low damping force is generated and a vibration suppression mode in which a high damping force is generated by turning on and off the switching signal from the control circuit 60. Each damping force switching electromagnetic valve 30 is provided in each hydraulic damper 20, and the damping force is in a hard state when not energized, and is in a soft state that generates a damping force lower than the hard state when energized.

  The low acceleration seismic device 40 is a seismic device that detects a predetermined low acceleration (first vibration state) set in advance. For example, the contact is closed at an acceleration of about 12 Gal and the first earthquake detection signal is detected. Is output. Here, the acceleration of 12 Gal is an acceleration corresponding to a range corresponding to 8.0 to 25 Gal which is a standard of seismic intensity 3 of the Japan Meteorological Agency vibration class. When the low acceleration seismic device 40 detects an acceleration lower than a predetermined value and outputs an earthquake detection signal to the control circuit 60, the control circuit 60 switches the electromagnetic valve output to each damping force switching electromagnetic valve 30. Turn on the signal. Accordingly, each damping force switching electromagnetic valve 30 switches the damping coefficient to a low damping coefficient CL so as to reduce the damping force of each damper 20.

  The predetermined low acceleration may be set to a small acceleration that can be experienced. In this case, it is desirable that the low acceleration seismic device 40 is an automatic return type seismic device capable of continuous detection.

  The high acceleration seismic device 50 is a seismic device that detects a predetermined high acceleration (second vibration state) that is higher than the predetermined low acceleration described above. Is configured to close. Here, the acceleration of 150 Gal is an acceleration corresponding to a range corresponding to 80 to 250 Gal, which is a standard of seismic intensity 5 of the Japan Meteorological Agency vibration class. When the high acceleration seismic device 50 detects an acceleration higher than a predetermined value and outputs a second earthquake detection signal to the control circuit 60, the control circuit 60 switches the electromagnetic valve to each damping force switching electromagnetic valve 30. Switch the signal off. That is, each damping force switching electromagnetic valve 30 switches the damping coefficient to a high damping coefficient CH so as to maintain the damping force of each hydraulic damper 20 in a high state (CH> CL).

  The detectable acceleration is not limited to 150 Gal, and can be set to about 300 Gal so as to correspond to accelerations 250 to 400 Gal of seismic intensity 6 of the seismic intensity class, for example.

  From the viewpoint of cost, each of the above-mentioned seismic devices 40 and 50 is preferably a gravitational type seismic device that switches a switch when a weight falls due to gravity.

  Here, the seismic isolation control process 1 executed by the control circuit 60 will be described.

  FIG. 2 is a flowchart for explaining the seismic isolation control process 1 of the first embodiment. As shown in FIG. 2, when the power switch of the power source 70 is turned on in S11, the control circuit 60 proceeds to S12 and turns off the energization of each damping force switching electromagnetic valve 30 and thereby the hydraulic damper 20 Is set to a high attenuation coefficient CH. That is, the damping force switching electromagnetic valve 30 is not energized (no solenoid valve switching signal is output), and the high damping mode state in which a high damping force is generated is maintained.

  This prevents the building from vibrating due to the wind.

  In the next S13, it is checked whether or not the low acceleration seismic device 40 has detected a predetermined low acceleration (for example, 12 Gal) (output an earthquake detection signal). In S13, when the low acceleration seismic device 40 does not detect a predetermined low acceleration (for example, 12 Gal) set in advance (in the case of NO), the process returns to S12, and the processes of S12 and S13 are repeated. Therefore, normally, it is monitored whether or not the low acceleration seismic device 40 detects an acceleration (for example, 12 Gal) lower than a predetermined value set in advance, and the damping coefficient of the hydraulic damper 20 is set to a high damping coefficient CH. Keep vibration suppression mode.

  In S13, if the low acceleration seismic device 40 detects a predetermined low acceleration (for example, 12 Gal) set in advance (in the case of YES), the relative displacement between the building and the foundation becomes large, and the allowable displacement is reduced. Since there is a possibility of exceeding, the process proceeds to S14.

  In S14, a timer T1 (for example, a timer count time of 180 seconds) is started to start timing. In S14, when the timer count time of 180 seconds has not elapsed (in the case of NO), the process proceeds to S15, and energization of each damping force switching electromagnetic valve 30 is turned on to set the damping coefficient of the hydraulic damper 20 to a low damping coefficient CL. Set. The timer T1 maintains the damping coefficient of the hydraulic damper 20 for a predetermined time (timer count time 180 seconds) with a low state. That is, in S15, in the case of an earthquake with a low acceleration (for example, 12 Gal), the damping coefficient of the hydraulic damper 20 is switched to a low damping coefficient CL to enhance the seismic isolation effect, and the first acceleration sensor 40 for the low acceleration is used. During the period from when the earthquake detection signal is output until the predetermined time elapses, each damping force switching electromagnetic valve 30 is energized (outputs the electromagnetic valve switching signal) to maintain the seismic isolation mode for generating a low damping force. .

  In S14, when the timer count time of 180 seconds has elapsed (in the case of YES), since there is a low possibility that an earthquake will continue, the process returns to S12 and the damping coefficient of the hydraulic damper 20 is returned to the high damping coefficient CH. The process after S12 is performed.

  In next S16, it is checked whether or not the high acceleration seismic device 50 has detected a predetermined high acceleration (for example, 150 Gal) set in advance. In S16, when the high acceleration sensor 50 does not detect a predetermined high acceleration (for example, 150 Gal) set in advance (in the case of NO), the process returns to S14, and the processes of S14 to S16 are repeated. In S16, when the high acceleration seismic device 50 detects a predetermined high acceleration (for example, 150 Gal) set in advance (in the case of YES), the relative displacement (amplitude) of the building is amplified more than the allowable displacement. Since there is a fear, the process proceeds to S17.

  In S17, a timer T2 (for example, a timer count time of 60 seconds) is activated to start timing. In S17, when the timer count time of 60 seconds has not elapsed (in the case of NO), the process proceeds to S18, and the damping coefficient of the hydraulic damper 20 is set to a high damping coefficient CH. That is, in the case of an earthquake with a high acceleration (for example, 150 Gal), the damping coefficient of the hydraulic damper 20 is switched to a high damping coefficient CH so that the relative displacement (amplitude) between the building and the foundation does not exceed the allowable range (limit value). In addition, the damping force switching electromagnetic valve 30 is in the period from when the second earthquake detection signal from the high acceleration seismic device 50 is output until the predetermined time (timer count time 60 seconds) elapses. On the other hand, no vibration is applied (no solenoid valve switching signal is output), and the vibration suppression mode for generating a high damping force is maintained. Thereafter, the process returns to S17. In S17, when the timer count time of 60 seconds elapses (in the case of YES), it is highly likely that an earthquake with high acceleration (for example, 150 Gal) has converged, so the process returns to S13, and after S13 Process.

  Generally, buildings with a seismic isolation system have a lower effect of reducing vibration transmission because the lower the damping force of the hydraulic damper 20 is, the harder it is to transmit the ground acceleration to the building. The relative displacement is likely to occur. On the other hand, when the damping force of the hydraulic damper 20 is high, the relative displacement between the foundation (ground) and the building can be suppressed, but the acceleration of the earthquake is easily transmitted to the building, and the effect of reducing vibration transmission tends to be difficult to obtain.

  In other words, in a moderate-scale earthquake (for example, the Japan Meteorological Agency seismic intensity 3), the relative displacement between the foundation (ground) and the building is within an allowable range (usually the maximum amplitude of laminated rubber), even if acceleration reduction is prioritized. ) Is not exceeded. However, in a large-scale earthquake (for example, an earthquake intensity of 6 or more in the Meteorological Agency seismic class), if priority is given to reducing acceleration, the relative displacement between the foundation (ground) and the building may exceed the allowable range. Yes, if the vibration exceeds the allowable range, the displacement is suppressed by the stopper or the damper immediately before the allowable range, and at that time, a large acceleration is transmitted to the building. Therefore, when developing a seismic isolation system, the amount of allowable displacement between the foundation (ground) and the building and the amount of damping force required for the building is assumed, assuming a large-scale earthquake (for example, seismic intensity 5 or higher of the Meteorological Agency seismic intensity class) Therefore, a sufficient seismic isolation effect cannot be obtained in a moderate-scale earthquake (for example, the Japan Meteorological Agency seismic intensity level 3).

  However, in the present embodiment, the damping force of the hydraulic damper 20 is set to be high to prevent the building from being shaken by winds or the like in the middle scale or lower, that is, in an earthquake up to a predetermined low acceleration (for example, 12 Gal). In an earthquake exceeding a predetermined low acceleration (for example, 12 Gal), the damping force of the hydraulic damper 20 is set low to effectively suppress the transmission of vibrations to the building. By switching so that the damping force of the hydraulic damper 20 can be increased, it is possible to construct a seismic isolation system that suppresses vibration transmission while keeping the amplitude within an allowable range.

  Further, as compared with the conventional method in which the calculation is performed based on the signal from each sensor using a computer and then the damping coefficient of each hydraulic damper 20 is switched, the calculation processing load is reduced and the computer can be configured with an inexpensive computer. Therefore, the manufacturing cost can be greatly reduced.

[Embodiment 2]
FIG. 3 is a diagram showing Embodiment 2 of the damping force switching seismic isolation system according to the present invention. In FIG. 3, the same parts as those in FIG.

As shown in FIG. 3, the damping force switching seismic isolation system 10A includes a plurality of hydraulic dampers 20 (20 _{1 to} 20 _n ), a damping force switching electromagnetic valve 30 (30 ₁ to 30 _n ), and a low acceleration type. It includes a seismic device 40, a breaker with an earthquake seismic device (power switch switching means) 80, a control circuit 60, and a power source 70.

  The breaker 80 with a seismic seismic device is provided between the control circuit 60 and the power source 70. The seismic device detects an acceleration higher than a predetermined value set in advance, and the power source 70 detects an earthquake of the seismic device. This is a device combined with a normally closed type power switch that cuts off power supply to each damping force switching electromagnetic valve 30. Note that the seismoscope mounted on the breaker 80 with seismic seismograph performs earthquake detection at the same level as the high acceleration seismic sensor 50.

  Here, the seismic isolation control process 2 executed by the control circuit 60 will be described.

  FIG. 4 is a flowchart for explaining seismic isolation control processing 2 according to the second embodiment. In FIG. 4, since S21-S25 performs the same process as S11-S15 mentioned above, description is abbreviate | omitted.

  When the seismoscope of the breaker 80 with seismic seismometer detects a predetermined high acceleration (for example, 150 Gal) set in advance (YES) in S26, the control circuit 60 proceeds to the process of S27.

  In S27, since the breaker 80 with a seismic instrument blocks the power supply from the power supply 70, the damping coefficient of the hydraulic damper 20 is set to a high damping coefficient CH. That is, in the case of an earthquake with a high acceleration (for example, 150 Gal), the damping coefficient of the hydraulic damper 20 is switched to a high damping coefficient CH so that the relative displacement (amplitude) between the building and the foundation does not exceed the allowable range (limit value). Suppress. Moreover, the breaker 80 with a seismic seismic device detects acceleration (for example, 150 Gal) higher than a predetermined value set in advance and shuts off the power supply, and then resets the seismic seismic device manually.

[Embodiment 3]
FIG. 5 is a diagram showing Embodiment 3 of the damping force switching seismic isolation system according to the present invention. In FIG. 5, the same parts as those in FIGS.

The damping force switching seismic isolation system 10B includes a plurality of hydraulic dampers 20 (20 _{1 to} 20 _n ), a damping force switching solenoid valve 30 (30 ₁ to 30 _n ), a breaker 80 with a seismic seismic device, and a power source 70. And have. In the third embodiment, since the low acceleration seismic device 40, the control circuit 60, and the timer are reduced, the installation work can be easily performed and the manufacturing cost can be reduced.

The breaker 80 with a seismic device is provided between the power source 70 and each damping force switching electromagnetic valve 30 and is electrically connected to each damping force switching solenoid valve 30 via a signal line 82 (82 _{1 to} 82 _n ). Connected. Therefore, the breaker 80 with a seismic device normally supplies the current from the power source 70 directly to each damping force switching electromagnetic valve 30 and supplies power to each damping force switching electromagnetic valve 30 (a solenoid valve switching signal is supplied). Output) and maintain a state of generating a low damping force.

  In addition, since the seismoscope mounted on the breaker with seismic seismic device 80 detects earthquakes at the same level as the high acceleration seismic device 50, the seismic sensation is detected by detecting earthquakes at a predetermined high acceleration (for example, 150 Gal). A breaker with a seismic device 80 cuts off the power supply from the power source 70 to each damping force switching electromagnetic valve 30. Therefore, the damping coefficient of the hydraulic damper 20 is set to a high damping coefficient CH. That is, in the case of an earthquake with a high acceleration (for example, 150 Gal), the damping coefficient of the hydraulic damper 20 is switched to a high damping coefficient CH so that the relative displacement (amplitude) between the building and the foundation does not exceed the allowable range (limit value). Suppress.

FIG. 6 is a flowchart for explaining a procedure of seismic isolation control according to the third embodiment. In the third embodiment, since there is no control circuit, the procedure of the switching operation of the breaker with seismic device 80 will be described.
(Procedure 1) Turn on the power switch.
(Procedure 2) Each damping force switching electromagnetic valve 30 is energized via the breaker 80 with a seismic detector.
(Procedure 3) When the predetermined high acceleration (for example, 150 Gal) is not detected (in the case of NO) by the breaker 80 with the seismic shock absorber, each attenuation is performed through the breaker 80 with the seismic shock absorber in the procedure 2. The power switching electromagnetic valve 30 is energized. Moreover, when the breaker 80 with a seismic seismic device detects a predetermined high acceleration (for example, 150 Gal) set in advance (in the case of YES), the procedure proceeds to step 4.
(Procedure 4) The breaker 80 with a seismic seismic device cuts off the power supply from the power source 70 to each damping force switching electromagnetic valve 30. Therefore, the damping coefficient of the hydraulic damper 20 is set to a high damping coefficient CH. That is, in the case of an earthquake with high acceleration (for example, 150 Gal), the damping coefficient of the hydraulic damper 20 is set to a high damping coefficient CH so that the relative displacement (amplitude) between the building and the foundation does not exceed the allowable range (limit value). To do. Moreover, the breaker 80 with a seismic seismic device detects acceleration (for example, 150 Gal) higher than a predetermined value set in advance and shuts off the power supply, and then resets the seismic seismic device manually.

  In the first to third embodiments, the case where each damping force switching electromagnetic valve 30 is a normally closed solenoid valve has been described. However, the present invention is not limited thereto, and a normal open solenoid valve opposite to the above is used. The damping coefficient of the hydraulic damper 20 is set to a high damping coefficient CH by turning on the energization of each damping force switching electromagnetic valve 30, and the damping coefficient of the hydraulic damper 20 is lowered to a low damping by turning off the energization of each damping force switching electromagnetic valve 30. It is also possible to set the coefficient CL.

  Further, the power switch of the breaker with seismic device 80 may be a normally closed type power switch or a normally open type power switch.

  In the first to third embodiments, the damping force switching electromagnetic valve 30 has been described using the configuration provided in each hydraulic damper 20. However, the present invention is not limited to this, and each damping force switching electromagnetic valve 30 and each The thing of the structure provided with the hydraulic damper 20 separately may be sufficient.

  In addition, although each said embodiment showed the example using a computer, it is not restricted to this, When a seismic device detects a vibration, it is required for the solenoid valve 30 for damping force switching by the switch of a seismic device. By constructing the circuit so that a large current flows, it is possible to construct a system that does not use a computer and that further reduces costs. In addition, the above-described breaker with seismic device 80 can be used in this system.

10, 10A, 10B Damping force switching seismic isolation system 20 (20 _{1 to} 20 _n ) Hydraulic damper 22 Cylinder 24 Piston rod 30 (30 ₁ to 30 _n ) Damping force switching solenoid valve 40 Low acceleration seismometer 50 High acceleration Seismic device 60 control circuit 62 (62 _{1 to} 62 _n ), 82 (82 _{1 to} 82 _n ) signal line 70 power supply 80 breaker with seismic device

Claims (5)

A damper that generates a damping force that attenuates the acceleration input to the structure;
A damping force switching solenoid valve for switching the damping force of the damper;
A seismometer that outputs an earthquake detection signal when the vibration caused by the earthquake reaches a predetermined vibration state;
When an earthquake detection signal is input from the seismic device, output means for outputting a switching signal for switching the damping force switching electromagnetic valve;
A damping force switching seismic isolation system characterized by comprising: The seismoscope is configured to output a first seismic detection signal when the first vibration state is reached, and a second vibration state that is larger than the first vibration state. And a second seismoscope that outputs a second earthquake detection signal,
The output means outputs a first switching signal that causes the damper to generate a low damping force when the first earthquake detection signal is input, and when the second earthquake detection signal is input. 2. The damping force switching seismic isolation system according to claim 1, wherein the damper outputs a second switching signal that causes the damper to generate a damping force higher than the low damping force. The damping force switching electromagnetic valve is in a soft state in which the damping force is in a hard state when not energized, and generates a damping force lower than that in the hard state when energized,
2. The damping force according to claim 1, wherein the seismic device has a power switch switching unit that cuts off power to the damper when the second vibration state is greater than the predetermined vibration state. Switching seismic isolation system. A damper that generates a damping force that attenuates the acceleration input to the structure;
A damping force switching solenoid valve that is provided in the damper and is in a hard state when de-energized and in a soft state that generates a lower damping force than the hard state when energized;
A first seismic device that is energized when vibration caused by an earthquake enters a first vibration state;
A second seismic device that interrupts energization when vibration caused by an earthquake becomes a second vibration state larger than the first vibration state;
A damping force switching seismic isolation system characterized by comprising:   The damping force switching seismic isolation system according to any one of claims 1 to 4, wherein the seismic device is a gravity type seismic device that switches a switch when a weight falls due to gravity.

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