JP4915842B2 - Seismic isolation system - Google Patents

Description

  The present invention relates to a seismic isolation system suitable for use in isolating a structure in which a number of vibration isolator devices such as a semiconductor manufacturing factory are arranged.

  In recent years, in order to ensure the safety of structures against earthquakes, vibrations that are transmitted from the ground to the structure due to earthquakes, etc., can be mitigated by installing seismic isolation devices at the foundation of the structure. Various seismic isolation systems have been developed that reduce the stress and deformation that occur in the structural frame.

  In the above conventional seismic isolation system, in order to obtain the target seismic isolation performance in the event of an earthquake, an elastic bearing system seismic isolation device using laminated rubber, etc., a sliding bearing system or a rolling bearing system seismic isolation device, and A combination of horizontal dampers and the like is employed as appropriate.

  By the way, among such seismic isolation systems, the acceleration reduction rate during an earthquake is a combination of a seismic isolation device using laminated rubber and a horizontal horizontal damper, that is, as shown in FIG. The building (upper structure) 1 is supported by the seismic isolation device 3 using laminated rubber interposed between the foundation (upper structure) 2 and one end of the viscous horizontal damper 4 is attached to the building 1. A seismic isolation system in which the other ends are connected to the foundation 2 is most suitable.

  However, in the above seismic isolation system, since the building 1 is supported only by the seismic isolation device 3 using laminated rubber, as shown in FIG. However, the period of the building 1 is lengthened even in normal times. For this reason, there is a problem that the building 1 is easily shaken by environmental vibration such as vibration caused by the equipment in the building or traffic vibration propagated from the surrounding ground to the foundation 2. It could not be applied to a case where a large number of production apparatuses that extremely dislike vibrations are installed, such as a manufacturing factory or a precision machine factory.

Therefore, as shown in FIG. 6 (a), in addition to the seismic isolation device 3 and the horizontal damper 4, there is also a seismic isolation system in which a sliding support seismic isolation device 5 is installed between the building 1 and the foundation 2. Proposed.
In this seismic isolation device, the seismic isolation layer 5 is in a fixed state because slippage does not occur in the seismic isolation device 5 of the sliding support system due to micro vibrations and environmental vibrations acting on the building 1 and the ground 2. Therefore, as shown in FIG. 6 (b), since the same rigidity as that of a normal building without a seismic isolation system can be secured, the problem that the building 1 is easily shaken by these slight vibrations or the like. Can be eliminated.

However, in the above seismic isolation system, when a small and medium earthquake occurs, the insulating effect between the building 1 and the foundation 2 is reduced by the frictional force when the sliding bearing seismic isolation device 5 operates. Therefore, there has been a problem that the effect of reducing acceleration, that is, the seismic isolation effect, is inferior to that of the base isolation system shown in FIG.
JP 11-36657 A

  The present invention has been made in view of such circumstances, and with respect to environmental vibration such as vibration caused by equipment in the upper structure, the upper structure is swayed by high rigidity without exhibiting a seismic isolation effect. It is an object of the present invention to provide a seismic isolation system that can prevent the occurrence of major damage to buildings by suppressing the occurrence of earthquakes and demonstrating the seismic isolation effect of the seismic isolation device. .

In order to solve the above problems, the invention according to claim 1 is a seismic isolation device using a laminated rubber that is interposed between an upper structure and a lower structure and supports the upper structure, and one end portion of which is the above-mentioned A horizontal damper connected to the upper structure and having the other end connected to the lower structure and disposed in the horizontal direction; a lower part of the upper structure adjacent to the seismic isolation device; And a fixing device that can be connected to and released from the upper structure and the lower structure by being fixed to one of the upper structure and the lower structure and being detachable from the other. If the vibration detection unit detecting vibration of the superstructure or substructure, to the fixing device when the vibration detecting means detects the vibration of more than sway due to environmental vibrations of the superstructure or substructure That a control means for releasing the connection between the upper and lower structures, and between the said fixing device and the superstructure, by the detection of the shaking or shaking due to environmental vibration by the vibration detection unit even when the control unit is not working, it caused a rupture or slippage in which the auxiliary uncoupling means for releasing the connection between the upper and lower structures is characterized that you have been interposed.

According to a second aspect of the present invention, when the control means according to the first aspect detects an acceleration of 10 Gal or more or an amplitude of 10 μ or more caused by environmental vibration, the fixing device The above-described upper structure and lower structure are disconnected from each other.
Here, the environmental vibration is a general term for vibration generated by equipment and manufacturing equipment installed in a building in a normal time when no earthquake occurs, or traffic vibration propagated from the surrounding ground.

In the invention described in claim 1 or 2 , the upper structure and the lower structure are connected to each other by a fixing device in a normal state to fix the seismic isolation layer so that the seismic isolation device using the laminated rubber does not operate. As a result, rigidity equivalent to that of a normal building can be ensured, and therefore, the superstructure can be prevented from excessively shaking due to environmental vibration. Further, when the vibration detection means detects a vibration greater than the vibration caused by the environmental vibration, the control means releases the connection between the upper structure and the lower structure by the fixing device, and the seismic isolation device using the laminated rubber and The horizontal damper is activated and the seismic isolation effect is demonstrated.

  As a result, for environmental vibrations such as vibrations caused by equipment in the superstructure, it is possible to suppress the superstructure from shaking due to high rigidity without exhibiting the seismic isolation effect. In addition, the seismic isolation effect of the seismic isolation device can be demonstrated to prevent the building from being damaged greatly. As the horizontal damper, a viscoelastic damper, a viscous damper, or the like can be applied. However, it is preferable to use a viscous damper such as an oil damper that can obtain the highest acceleration reduction rate.

  At this time, if the fixing device is installed, for example, between the slab of the upper structure and the lower structure, when the upper structure is shaken due to environmental vibration, the slab is bent or deformed. The connection between the upper and lower structures is released, and the seismic isolation device using the laminated rubber is activated, which may cause excessive vibration in the upper structure. Moreover, if it installs in the said slab, it may interfere with equipment piping and is not suitable as an installation place.

  In this respect, according to the present invention, since the fixing device is disposed between the lower structure of the upper structure adjacent to the seismic isolation device or between the lower structure of the beam and the lower structure, long-term bending of the slab. Due to vibration caused by environmental vibrations, the connection between the upper and lower structures will not be released, so that the connection between the upper and lower structures in the normal state is securely maintained, and excessive vibration occurs in the upper structure. Can be prevented.

  Further, as in the invention described in claim 2, if the set value is set to an acceleration of 10 Gal or an amplitude of 10 μ due to the environmental vibration, in the above-described semiconductor manufacturing factory, precision machine factory, etc., internal equipment It is possible to maintain the connection between the upper and lower structures by the fixing device only for the fine vibration caused by the kind, and to obtain the seismic isolation effect for the shaking caused by the large and small earthquakes. In addition, since the load burden of the upper structure by the fixing device is reduced, the size can be reduced. As a result, it is possible to dispose it further adjacent to the seismic isolation device, and the operation accuracy of connection and release can be improved.

Furthermore, according to the invention described in claim 1 or 2 , even if the control means does not operate despite the fact that the vibration detection means detects a shake greater than the vibration caused by the environmental vibration, Since the relative displacement that occurs between the upper structure and the lower structure causes breakage or slip in the auxiliary connection release means, the connection between the upper and lower structures is released. Seismic isolation effect by horizontal damper can be obtained. In addition, it is preferable that the auxiliary connection releasing means is set so as to cause breakage or slippage when the swing of the upper structure is about 20 Gal (horizontal force of about 2% of the weight of the upper structure).

As the above-mentioned vibration detection means may be a vibration meter installed in the upper part structure and / or substructures. Alternatively, a receiving apparatus and a calculating means such as, from the magnitude and the information of source positions obtained by the above real-time seismic information received by the receiving device, an acceleration or in the superstructure using the arithmetic means such as attenuation relation It is also possible to calculate the speed. Also, the rigidity of the fixing device is such that the sum of the rigidity of the fixing device is 100 times or more of the sum of the rigidity of the seismic isolation device using laminated rubber in order to obtain a good fixing effect against micro vibrations. It is preferable to set.

1 to 4 show an embodiment in which the seismic isolation system according to the present invention is applied to a seismic isolation system in a building (upper structure) 10 in which vibration isolating equipment such as a semiconductor manufacturing factory is installed.
In this seismic isolation system, a seismic isolation device 13 using laminated rubber is interposed between the base 11 of the building 10 and the foundation (lower structure) 12, and one end 14 a of the building 10. An oil damper (viscous horizontal damper) 14 is installed which is connected to the beam 15 and has the other end 14b connected to the foundation 12 and disposed in the horizontal direction.

Moreover, as shown to Fig.3 (a), between the edge part of the beam 15 of the building 10 adjacent to the seismic isolation apparatus 13, and the foundation 12, or as shown to FIG.3 (b), the pillar 11 of the building 10 is shown. The fixing device 16 is disposed between the lower portion of the base plate 12 and the foundation 12.
As shown in FIG. 4, the fixing device 16 includes a hydraulic jack 17 installed on the foundation 12, a lower friction plate 18 integrally fixed to the upper surface of the hydraulic jack 17, and hydraulic oil to the hydraulic jack 17. It is comprised from the hydraulic pump 19 which supplies this.

  On the other hand, an auxiliary connection release device (auxiliary connection release means) is provided on the lower surface of the beam 15 or the column 11 of the building located above the lower friction plate 18 of the fixing device 16. In this auxiliary disconnection device, an upper friction plate 21 is attached to the lower surface of the beam 15 or the column 11 by a mortar 20 serving as a fracture buffer.

On the foundation 12 close to the building 10, a seismometer (vibrometer, vibration detection means) 22 and a control panel (control) that controls the operation of the hydraulic pump 19 based on a detection signal from the seismometer 22. Means) 23 is installed.
Here, the control panel 23 always supplies the hydraulic oil from the hydraulic pump 19 to the hydraulic jack 17 at normal times, and when the acceleration of 10 Gal or more or the amplitude of 10 μ is detected, the hydraulic oil in the hydraulic jack 17 is supplied. It is set to open.

  In the seismic isolation system having the above-described configuration, the hydraulic oil pressurized by the hydraulic jack 17 by the hydraulic pump 19 of the fixing device 16 is maintained in a normal state as shown in FIG. Thus, the lower friction plate 18 is pressed against the upper friction plate 21 to connect the building 10 and the foundation 12. As a result, the seismic isolation device 13 using the laminated rubber is not activated, and as shown in FIG. 2, the same rigidity as that of a normal building can be ensured. As a result, the building 10 can be prevented from shaking excessively due to environmental vibration.

  Moreover, as shown in FIGS. 3 (a) and 3 (b), the fixing device 16 is connected below the pillar 11 of the building 10 adjacent to the seismic isolation device 13 or below the beam 15 (more preferably, as shown in FIG. Therefore, even when the slab is bent due to local deflection of the slab or due to environmental vibration, the connection between the building 10 and the foundation 12 is released. It is possible to prevent the occurrence of excessive shaking in the building 10 by reliably maintaining the above connected state in normal times.

  In particular, in the above embodiment, when the seismometer 22 exceeds a slight vibration such as an acceleration of 10 Gal or more or an amplitude of 10 μm or more, since the connection by the fixing device 16 is set immediately, the strong wind Compared with the case where it is necessary to hold the connection until the time, the load load on the building 10 by the fixing device 16 can be reduced, so that the hydraulic jack 17 and the lower friction plate 18 can be downsized. Therefore, the fixing device 16 can be easily arranged below the beam 14 shown in FIG. 3A adjacent to the seismic isolation device 13 or below the pillar 11 of the building 10 shown in FIG. 3B. Thus, the operation accuracy of the connection and release can be improved.

When an earthquake occurs, when the seismometer 22 detects an acceleration of 10 Gal or more or an amplitude of 10 μ or more, the signal is sent to the control panel 23, and as shown in FIG. The hydraulic oil in the hydraulic jack 17 is released, the lower friction plate 18 descends, and a gap is formed between the upper friction plate 21 and the connection between the building 10 and the foundation 12 is released. .
Thereby, as shown in FIG. 2, the seismic isolation device 13 and the oil damper 14 using laminated rubber operate, and the seismic isolation effect is exhibited.

  In addition, in the unlikely event that the seismometer 22 detects a vibration greater than the set value, the control panel 23 does not respond and the hydraulic pressure of the fixing device 16 is not released. As a result, the building 10, the foundation 12, If the connection between the building 10 and the foundation 12 is not released, the relative displacement generated between the building 10 and the foundation 12 breaks the mortar 20 in the auxiliary connection releasing device, thereby releasing the connection between the building 10 and the foundation 12. . As a result, the seismic isolation effect by the seismic isolation device 13 and the oil damper 14 can be obtained by a so-called fail-safe function by the auxiliary disconnection device.

  As described above, according to the seismic isolation system having the above-described configuration, in the building 10 in which a large number of vibration-isolating devices such as a semiconductor manufacturing factory and a precision machine factory are arranged, a slight vibration or the like caused by equipment in the building 10 For environmental vibrations, it is possible to prevent the building 10 from shaking due to high rigidity by maintaining the connection between the building 10 and the foundation 12 by the fixing device 16 and not exhibiting the seismic isolation effect, and In the event of an earthquake or the like, it is possible to prevent the building from being seriously damaged by exhibiting the seismic isolation effect of the high acceleration reduction rate by the seismic isolation device 13 and the oil damper 14.

In the above-described embodiment, the vibration detection means has been described only with respect to the case where the seismometer 22 installed on the foundation 12 is used.
For example, in recent years, the P wave detected near the epicenter at the time of the earthquake, such as the Earthquake Early Warning (Nowcast) of the Japan Meteorological Agency and the Real-time Earthquake Information Utilization System (REIS) of the National Research Institute for Earth Science and Disaster Prevention Various systems for obtaining real-time earthquake information immediately have been developed, and a network system for distributing real-time earthquake information obtained by the system through the Internet or satellite communication is being put into practical use.

  Therefore, the vibration detection means is constituted by a receiving device that receives the real-time earthquake information when an earthquake occurs, and an arithmetic means that calculates an assumed acceleration or amplitude in the building 10 from the real-time earthquake information received by the receiving device. Then, the acceleration or velocity in the building 10 is calculated by the computing means from the information on the magnitude and the epicenter position obtained from the real-time earthquake information received by the receiving device, for example, using a distance attenuation formula, and is input to the control panel 23. It may be.

  Also, the advancement / retraction driving means such as a disc brake, an electric or electromagnetic actuator, a servo actuator using a servo motor, a piezo actuator, etc., is applied to the fixing device 16 instead of the hydraulic jack 17. Is possible.

It is the front view which looked at the cross section which shows one Embodiment of the seismic isolation system of this invention. (A) is a graph which shows the relationship between the restoring force and deformation | transformation at the time of the normal time and the earthquake in the seismic isolation system of FIG. 1, (b) is a graph which shows the operating state of a fixing device. It is a top view which shows arrangement | positioning of the seismic isolation apparatus and fixing device of FIG. It is a longitudinal cross-sectional view which shows the fixing means of FIG. 1, Comprising: (a) is a normal time, (b) is a figure which shows the state at the time of an earthquake. (A) is the front view which looked at the cross section which shows the conventional seismic isolation system, (b) is a graph which shows the relationship between the restoring force and a deformation | transformation. (A) is the front view which looked at the cross section which shows the other conventional seismic isolation system, (b) is a graph which shows the relationship between the restoring force and a deformation | transformation.

Explanation of symbols

10 Building (superstructure)
11 pillars 12 foundation (under structure)
13 Seismic isolation device using laminated rubber 14 Oil damper (viscous horizontal damper)
14a One end portion 14b Other end portion 15 Beam 16 Fixing device 20 Mortar 21 Upper friction plate 22 Seismometer (vibrometer, vibration detection means)
23 Control panel (control means)

Claims (2)

A seismic isolation device using laminated rubber that is interposed between the upper structure and the lower structure and supports the upper structure, and one end portion is connected to the upper structure and the other end portion is connected to the lower structure. It is arranged between the horizontal damper arranged horizontally and the lower structure of the upper structure adjacent to the seismic isolation device or below the beam and the lower structure, and fixed to one of the upper structure and the lower structure. And a fixing device capable of connecting and releasing the upper structure and the lower structure by being provided so as to be movable toward and away from the other, and a vibration detecting means for detecting vibration in the upper structure or the lower structure the control hand the vibration detecting means for releasing the connection between the upper and lower structures by the fixing device when detecting the vibration of more than sway due to environmental vibrations of the superstructure or substructure With the door, and it is between the fixing device and the superstructure, when the control unit is not operated by detecting the shaking or shaking due to environmental vibration by the vibration detection means, breaking or slipping seismic isolation system characterized that you have been interposed auxiliary uncoupling means for releasing the connection between the upper and lower structures to occur.   The control means releases the connection between the upper structure and the lower structure by the fixing device when the vibration detecting means detects an acceleration of 10 Gal or more or an amplitude of 10 μ or more caused by environmental vibration. The seismic isolation system according to claim 1.

Images