JP2023130740A - Wind resistance lock mechanism of base-isolated structure - Google Patents

Abstract

To provide a wind resistance lock mechanism of a base-isolated structure that can be made to exhibit base isolation performance in one of the states in earthquake or windstorm.SOLUTION: A wind resistance lock mechanism of a base-isolated structure comprises a wind velocity sensor 12 and an earthquake sensor 13 provided at a base-isolated structure, a pump 14 that is driven depending on a detection result of the wind velocity sensor and the earthquake sensor, a hydraulic jack device 11 that is coupled with the pump and is provided at a base isolation layer between an upper structure body 2 and a lower structure body 3, and a control part 15 for controlling the pump. The hydraulic jack device has a piston storage part fixed to the lower structure body, a piston moving vertically by hydraulic pressure supplied from the pump, and a pod part arranged above the piston. A restraining member is provided to restrain a horizontal relative displacement between the piston storage part and the pod part.SELECTED DRAWING: Figure 2

Description

The present invention relates to a windproof locking mechanism for a seismic isolation structure.

The amount of damper inserted into the seismic isolation layer of a seismically isolated building is determined by the optimal amount for earthquakes or the required amount for wind, whichever is greater. In recent years, as buildings have become larger, the amount of wind damping required has tended to increase, and there are cases in which buildings are attenuated too much against earthquakes, making it impossible to achieve optimal seismic isolation performance.

Japanese Patent Application Publication No. 2004-263430

As conventional windproof lock mechanisms, passive types and electrically controlled types are known.
For example, an example of a passive mechanism is a wind-resistant shear pin mechanism. The wind-resistant shear pin mechanism is one in which the shear pin is rigidly inserted directly between the upper and lower base isolation structures. However, in order to ensure a seismic isolation effect during earthquakes and to avoid frequent breakage of the shear pins due to relatively small earthquakes, this configuration requires the shear pins to be removed at all times, and when strong winds are expected, the shear pins must be removed. Only the shear pin needs to be inserted manually. Additionally, if an earthquake occurs at the same time as a strong wind, the shear pins will be severed due to excessive shearing force and will need to be removed and replaced.

Another example is one in which the shear pin is inserted between the upper and lower frames via an elastic beam. Since the elastic beam acts as a buffer and can avoid frequent breakage of the shear pin due to relatively small earthquakes, it is possible to keep the shear pin inserted at all times. However, with this configuration, the characteristics of the seismic isolation layer during an earthquake depend on the elastic beams, and the original seismic isolation performance cannot be achieved until the shear pins are cut due to excessive shear force.

As an electrically controlled type, a locking mechanism using an oil damper is known. Specifically, this is a mechanism that adds a locking mechanism to a general-purpose oil damper, detects earthquakes and wind using an earthquake and wind speed sensor, and locks the oil damper in the event of a strong wind other than when an earthquake occurs. However, since this mechanism is based on an oil damper, it is effective only in the axial direction (one direction) of the damper, and it is necessary to insert the device in both the X and Y directions. Further, it is necessary to arrange a necessary amount of oil dampers as a windproof locking mechanism, and since the dampers act as normal oil dampers in the event of an earthquake, the amount of dampers may become excessive in response to an earthquake.

For these reasons, there is a need for a wind-resistant locking mechanism for seismic isolation structures that can exhibit its original seismic isolation performance in both earthquakes and stormy conditions.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a wind-resistant locking mechanism for a seismic isolation structure that can exhibit seismic isolation performance in both earthquakes and stormy situations. shall be.

In order to achieve the above object, the wind-resistant locking mechanism of the base isolation structure according to the present invention is driven by a wind speed sensor and an earthquake sensor provided in the base isolation structure, and according to the detection results of the wind speed sensor and the earthquake sensor. a hydraulic jack device connected to the pump and provided in a seismic isolation layer between an upper structure and a lower structure, and a control unit that controls the pump, the hydraulic jack device comprising: It has a piston accommodating portion fixed to the lower structure, a piston that moves up and down by hydraulic pressure supplied from the pump, and a pod portion disposed above the piston. A restraining member is provided to restrain horizontal relative displacement with the pod part, and the control part raises the piston to move the pod part to the upper structure when the detection result of the wind speed sensor exceeds a set value. When the piston is brought into contact with the lower surface of the body and the detection result of the earthquake sensor is equal to or higher than the set value, and when the detection results of the wind speed sensor and the earthquake sensor are less than the set value under normal conditions, the piston is lowered. The pod part is spaced apart from the lower surface of the upper structure.

According to this invention, the hydraulic pressure supplied to the hydraulic jack device is controlled by the pump. At this time, the hydraulic pressure is controlled by the control unit based on the detection results of the wind speed sensor and the earthquake sensor, so manual operation is not required when locking the windproof lock. Moreover, the effect can be exerted in all horizontal directions. In addition, the restraining member can limit the relative movement distance in the horizontal direction between the piston accommodating part and the pod part, and by restraining the displacement of the pod part with respect to the lower structure, the wind-resistant lock mechanism functions. can be kept in good condition. Furthermore, the hysteresis characteristics of the seismic isolation layer can be made completely independent between earthquakes and storms, and the desired seismic isolation performance can be exhibited in both earthquakes and storms.

Further, in the present invention, a sliding material may be provided between the upper surface of the piston and the lower surface of the pod portion.
According to this invention, the horizontal force (shearing force) acting on the piston can be controlled, and damage to the piston can be prevented.

Further, in the present invention, a braking material may be provided on the upper surface of the pod part, and a braking plate may be provided on the lower surface of the upper structure.
According to this invention, even if residual displacement occurs in the seismic isolation layer due to an earthquake or strong wind, it can function without problems, and operations such as restoration after a major earthquake can be made unnecessary.

Moreover, in the present invention, one of the pumps may be connected to a plurality of the hydraulic jack devices.
According to this invention, the number of installed pumps can be reduced, and the arrangement of the seismic isolation layer can be made more efficient.

Further, in the present invention, the restraining member is configured with a falling wall extending downward from the periphery of the pod portion, and when the pod portion is in contact with the lower surface of the upper structure, The falling wall may be configured to enclose the piston accommodating portion while at least partially overlapping with the piston accommodating portion in the height direction.
According to this invention, by simply providing a falling wall in the pod part as a restraining member, the relative movement distance in the horizontal direction between the piston housing part and the pod part can be limited, and the distance of the pod part relative to the lower structure can be limited. By restricting displacement, the windproof locking mechanism can be kept in a functional state.

According to the present invention, it is possible to provide a wind-resistant locking mechanism for a seismic isolation structure that can exhibit seismic isolation performance both during an earthquake and during a storm.

FIG. 1 is a schematic configuration diagram of a seismic isolation structure according to the present embodiment. FIG. 2 is a schematic structural diagram of a wind-resistant locking mechanism according to the present embodiment. It is a front view showing the jack-down state of the hydraulic jack device of this embodiment. FIG. 2 is a front view showing the jack-up state of the hydraulic jack device of the present embodiment. It is a control flowchart of the hydraulic jack device of this embodiment.

Hereinafter, a windproof locking mechanism for a seismic isolation structure according to an embodiment of the present invention will be described based on FIGS. 1 to 5.

As shown in FIG. 1, in the seismic isolation structure 1 of this embodiment, a seismic isolation layer 4 is provided between an upper structure 2 and a lower structure 3. The seismic isolation layer 4 is provided with a seismic isolation device 5 such as seismic isolation rubber and a hydraulic jack device 11 of the windproof locking mechanism 10. Further, a wind speed sensor 12 is provided on the roof of the upper structure 2, and an earthquake sensor 13 is provided on the lowest layer of the lower structure 3. Note that the wind speed sensor 12 and the earthquake sensor 13 may be installed at locations other than those mentioned above.

As shown in FIG. 2, the wind-resistant lock mechanism 10 includes a hydraulic jack device 11, a wind speed sensor 12, an earthquake sensor 13, a pump 14 that drives the hydraulic jack device 11, and a control section 15 that controls the drive of the pump 14. , and a hose 16 that connects the pump 14 and the hydraulic jack device 11.

As shown in FIGS. 3 and 4, the hydraulic jack device 11 has a piston accommodating portion 21 fixed to the lower structure 3, and is moved up and down relative to the piston accommodating portion 21 by hydraulic pressure supplied below the piston from the pump 14. The piston 22 has a pod portion 23 disposed above the piston 22.

The piston housing portion 21 includes a flange-shaped bottom portion 31 fixed to the lower structure 3, a side wall portion 32 extending in a cylindrical shape from the bottom portion 31, and an upper end of the side wall portion 32 extending toward the central axis O1. and an upper end flange portion 33. For example, the piston accommodating portion 21 is formed in a cylindrical shape.

The piston 22 is accommodated in the piston accommodating portion 21. The piston 22 includes a columnar main body 35 and a flange 36 formed at the lower end of the main body 35. For example, the piston 22 is formed into a cylindrical shape. A sliding member 40 is attached to the upper surface 35a of the main body portion 35. The sliding material 40 is, for example, a friction plate or a stainless steel plate. The piston 22 is moved up and down by hydraulic pressure. In the jacked-down state, the piston 22 is accommodated in the hollow portion 34 of the piston accommodating portion 21. In the jacked up state, the main body 35 of the piston 22 protrudes upward from an opening 33a formed inside the upper end flange 33 of the piston accommodating portion 21. The piston 22 can rise to a position where the flange portion 36 abuts the upper end flange portion 33 of the piston housing portion 21 .

The pod portion 23 is disposed above the piston 22 and moves in accordance with the vertical movement of the piston 22. The pod portion 23 has a bottomed cylindrical shape that covers the piston housing portion 21 from above in a jacked-down state. The pod portion 23 includes a plate-shaped main body portion 41 located above the piston 22 and a falling wall 42 extending downward from the periphery of the main body portion 41. In the jacked-up state, the falling wall 42 is formed in such a size that at least a portion of the lower portion thereof overlaps the piston accommodating portion 21 in the height direction. A braking material 43 is attached to the upper surface 41a of the main body 41 of the pod portion 23. The braking material 43 is, for example, a friction plate or a plate made of stainless steel.

A brake plate 45 is attached to the lower surface 2a of the upper structure 2. In the jacked up state, the braking material 43 of the pod portion 23 and the braking plate 45 of the upper structure 2 are in contact with each other and are configured to be slidable. The brake plate 45 is, for example, a plate made of stainless steel.

Sliding resistance can be exerted when the brake material 43 and the brake plate 45 are in contact with each other. For example, if the vertical force of the hydraulic jack of the hydraulic jack device 11 is 4000 kN and the friction coefficient between the braking material 43 and the brake plate 45 is 0.3, each hydraulic jack device can exhibit a horizontal resistance capacity of 1200 kN. . By installing a plurality of such hydraulic jack devices 11, it becomes possible to cope with the wind load of super high-rise base isolation.

In the wind-resistant lock mechanism 10, one hydraulic jack device 11 is connected to one pump 14. Note that a plurality of hydraulic jack devices 11 may be connected to one pump 14. When connecting a plurality of hydraulic jack devices 11, the pump 14 may be selected to have a discharge amount that can accommodate the plurality of hydraulic jack devices 11. The number and arrangement of the pumps 14 may be determined in consideration of the planar arrangement plan of the hydraulic jack device 11 in the seismic isolation layer 4 so that the hose 16 has an appropriate length.

When the windproof locking mechanism 10 functions, it is in the state shown in FIG. 4, in which the piston 22 of the hydraulic jack device 11 is raised and exerts horizontal frictional resistance. In order to control the horizontal force acting on the piston 22, a sliding material 40 with a small friction coefficient is disposed between the upper surface 35a of the main body 35 of the piston 22 and the lower surface 41b of the main body 41 of the pod section 23. . In this embodiment, the sliding material 40 is attached to the upper surface 35a of the main body 35 of the piston 22, but it may be attached to the lower surface 41b of the main body 41 of the pod section 23.

When a horizontal force acts on the pod part 23 through the friction surface with the upper structure 2, only the frictional resistance of the sliding material 40 of that force is transmitted to the piston 22, and the remaining part is transmitted to the falling wall 42 of the pod part 23. This is handled by the bearing pressure resistance of the inner circumferential surface 42a of the piston accommodating portion 21 and the side surface 25 of the piston accommodating portion 21, thereby avoiding a direct action on the piston 22. For example, in the above case, if the sliding material 40 with a friction coefficient of 0.1 is used, the horizontal force transmitted to the piston 22 is 400 kN, and of the 1200 kN horizontal force, the remaining 800 (=1200-400) kN is the bearing pressure Processed by resistance. Therefore, excessive horizontal shearing force is not generated on the piston 22, and damage to the hydraulic jack device 11 can be prevented.

Next, the control law will be explained using the flowchart of FIG.
In step S1, wind speed information from the wind speed sensor 12 attached to the seismic isolation structure 1 and acceleration information from the earthquake sensor (acceleration sensor) 13 are measured, and the control unit 15 collects the measured values. Basically, the hydraulic jack device 11 of the wind-resistant locking mechanism 10 is jacked down at all times and during earthquakes, and jacked up and placed in a wind-resistant locked state when an external wind force is applied, such as during a storm. The threshold value for jack operation due to earthquake or external wind force can be set freely.

In step S2, the maximum wind speed detected by the wind speed sensor 12 is compared with a preset value (threshold value). If the maximum wind speed is greater than the set value, the process proceeds to step S3, and if it is less than the set value, the process proceeds to step S6.

In step S3, since it is determined that the wind blowing on the seismic isolation structure 1 is larger than the set value, the windproof locking mechanism 10 is turned on. Specifically, a drive signal is sent from the control unit 15 to the pump 14, and the pump 14 is driven to apply hydraulic pressure to the hydraulic jack device 11 via the hose 16. When hydraulic pressure is applied, the piston 22 is raised by the hydraulic pressure. The pod section 23 also rises as it is pushed by the piston 22, and the braking material 43 attached to the upper surface 41a of the main body section 41 of the pod section 23 comes into contact with the braking plate 45 attached to the lower surface 2a of the upper structure 2. . This results in a wind-resistant locked state with a frictional resistance force (=friction coefficient x jack load) of the contact portion.

In step S4, the acceleration of the earthquake sensor 13 is measured in the windproof lock state, and the control unit 15 detects the measured value. The acceleration detected by the earthquake sensor 13 is compared with a preset value (threshold value). If the detected acceleration is greater than the set value, the process proceeds to step S5, and if it is less than the set value, the process proceeds to step S7.

In step S5, it is determined that an earthquake larger than a preset magnitude has occurred in the wind-resistant lock state, and the wind-resistant lock state is promptly turned off from ON. Specifically, the control unit 15 sends a signal to release a valve (not shown) in the pump, and as the hydraulic pressure of the jack decreases, the pod unit 23 separates from the lower surface 2a of the upper structure 2. Further, the piston 22 and the pod portion 23 descend to return to the jacked-down state. When the oil pressure of the jack decreases, the contact surface pressure between the pod portion 23 and the upper structure 2 decreases, the frictional resistance of the contact portion decreases, and the locked state is released.

In step S6, since it is determined that the wind blowing on the seismic isolation structure 1 is less than the set value, the windproof locking mechanism is turned off. However, once it is determined in step S2 that the maximum wind speed exceeds the set value, the wind-resistant locking mechanism is maintained in the ON state for, for example, one hour after the determination. With this configuration, it is possible to prevent the windproof locking mechanism 10 from frequently turning on and off.

In step S7, it is determined that an earthquake larger than the set value has not occurred in the wind-resistant lock state, and the wind-resistant lock state is kept ON. However, once it is determined in step S4 that a large earthquake has occurred, the windproof locking mechanism is kept in the OFF state for, for example, 5 minutes after the determination. With this configuration, it is possible to prevent the windproof locking mechanism 10 from repeatedly turning on and off frequently, and even if aftershocks occur, the seismic isolation function of the seismic isolation layer 4 can be operated reliably.

As described above, a timer may be provided to continue the jacking behavior to be performed when a disturbance is detected for a certain period of time from the moment an earthquake or external wind force is detected. The above-mentioned one hour in step S6 and five minutes in step S7 are examples, and the time can be changed as appropriate.

Furthermore, in order to ensure that the jackdown is completed, a timer may be added to keep the valve for releasing hydraulic pressure open for a certain period of time. Alternatively, a vertical limit switch or a vertical displacement meter may be added to the hydraulic jack device 11 to provide a sensor that physically detects that the piston 22 has reliably descended by a certain displacement or more.

Furthermore, in a seismic isolation structure 1 having a seismic isolation layer on an intermediate floor, such as the seismic isolation layer 4, in order to prevent the elevator that penetrates the seismic isolation layer 4 from stopping during strong winds such as during the monsoon season, the stopping conditions are set. A control law may be added that observes the displacement of a certain seismic isolation layer 4 and jacks it up even when the value exceeds a certain value. Note that the displacement of the seismic isolation layer 4 may be measured using a horizontal limit switch or a horizontal displacement meter. However, in order to identify that the observed displacement is caused by some kind of micro-vibration such as an earthquake or construction vibration, or if it is definitely caused by external wind force rather than residual displacement, the activation conditions for the wind-resistant lock are based on multiple conditions. A combination is desirable. For example, the windproof lock is activated when all conditions such as a wind speed of 20 m/s or more, an acceleration of 5 gal or less, and a seismic isolation layer displacement of 1 cm or more are satisfied.

In addition, while the windproof lock state of the seismic isolation layer 4 continues, the external wind force may become stronger, exceeding the windproof lock friction force and causing the hydraulic jack device 11 to slide. The hydraulic jack device 11 may be allowed to slide as it is to function as a friction damper. Alternatively, the hydraulic jack device 11 targets external wind forces within a specific reproduction period range and performs a wind-resistant lock to ensure habitability and continue elevator operation, and jacks down against external forces exceeding that range. You may release the windproof lock by letting the user do this. In this case, the displacement of the seismic isolation layer 4 may be measured using a horizontal limit switch or a horizontal displacement meter, and the structure may be jacked down when the value exceeds a certain threshold.

According to this embodiment, the wind speed sensor 12 and the earthquake sensor 13 provided in the seismic isolation structure 1 are connected to the pump 14, which is driven according to the detection results of the wind speed sensor 12 and the earthquake sensor 13, The hydraulic jack device 11 includes a hydraulic jack device 11 provided in the seismic isolation layer 4 between the upper structure 2 and the lower structure 3, and a control section 15 that controls the pump 14. It has a fixed piston housing part 21, a piston 22 that moves up and down by hydraulic pressure supplied from the pump 14, and a pod part 23 disposed above the piston 22. A falling wall (restraint member) 42 is provided to restrain horizontal relative displacement between the wind speed sensor 12 and the pod part 23. is brought into contact with the lower surface 2a of the upper structure 2, and when the detection result of the earthquake sensor 13 is equal to or higher than the set value, and when the detection results of the wind speed sensor 12 and the earthquake sensor 13 are less than the set value during normal times, , the piston 22 is lowered to separate the pod portion 23 from the lower surface 2a of the upper structure 2.

With this configuration, the hydraulic pressure supplied to the hydraulic jack device 11 can be controlled by the pump 14 based on the drive signal from the control unit 15. At this time, the control unit 15 can control the drive of the pump 14 and adjust the oil pressure based on the detection results of the wind speed sensor 12 and the earthquake sensor 13, so manual operation is not required when windproof locking is performed. Furthermore, since the piston 22 only moves up and down, it can be effective in all horizontal directions. Further, by raising the piston 22 and bringing the pod portion 23 into contact with the upper structure 2, a windproof lock state can be achieved. Furthermore, the falling wall (restraint member) 42 can limit the relative movement distance in the horizontal direction between the piston housing section 21 and the pod section 23, and restrain the displacement of the pod section 23 with respect to the lower structure 3. By doing so, you can keep the windproof lock mechanism in a functional state. In other words, the hysteresis characteristics of seismic isolation can be made completely independent between earthquakes and storms, and the desired seismic isolation performance can be exhibited in both earthquakes and storms.

Furthermore, since the sliding material 40 is provided between the upper surface 22a of the piston 22 and the lower surface 41b of the main body 41 of the pod section 23, the horizontal force (shearing force) acting on the piston 22 can be controlled, causing damage to the piston. can be prevented.

In addition, since a damping material 43 is provided on the upper surface 41a of the main body 41 of the pod portion 23, and a damping plate 45 is provided on the lower surface 2a of the upper structure 2, residual displacement may occur in the seismic isolation layer due to earthquakes or strong winds. In addition to being able to function without any problems even in the event of a major earthquake, it also eliminates the need for operations such as restoration after a major earthquake.

Furthermore, the restraint member is configured with a falling wall 42 extending downward from the periphery of the pod part 23, and when the pod part 23 is in contact with the lower surface 2a of the upper structure 2, the falling wall 42 is configured to cover the piston accommodating portion 21 while at least partially overlapping with the piston accommodating portion 21 in the height direction. In other words, with the simple configuration of providing the falling wall 42, it is possible to limit the relative movement distance in the horizontal direction between the piston accommodating part 21 and the pod part 23, and to maintain the windproof locking mechanism 10 in a functional state. be able to. Further, when a horizontal force is applied to the pod section 23 through the friction surface with the upper structure 2, only the frictional resistance of the sliding material 40 of that force is transmitted to the piston 22, and the remaining force is transmitted to the falling part of the pod section 23. This is handled by the bearing pressure resistance of the inner circumferential surface 42a of the wall 42 and the side surface 25 of the piston accommodating portion 21, and a direct action on the piston 22 can be avoided.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. The present invention can be modified within the scope of the invention as defined in the claims.

Furthermore, in this embodiment, the sliding material 40 is provided between the upper surface 22a of the piston 22 and the lower surface 41b of the main body 41 of the pod section 23, but if the desired frictional resistance is ensured, the sliding material 40 will not be necessary. You can.

Further, in this embodiment, the braking material 43 is provided on the upper surface 41a of the main body 41 of the pod portion 23, and the braking plate 45 is provided on the lower surface 2a of the upper structure 2, but the desired frictional resistance is The braking material 43 and the braking plate 45 may not be provided if they are provided.

Furthermore, in the present embodiment, the falling wall 42 of the pod portion 23 functions as a restraining member, but the restraining member may have another configuration.

1 Seismic isolation structure 2 Upper structure 2a Lower surface 3 Lower structure 4 Seismic isolation layer 10 Wind-resistant locking mechanism 11 Hydraulic jack device 12 Wind speed sensor 13 Earthquake sensor 14 Pump 15 Control section 21 Piston housing section 22 Piston 22a Upper surface 23 Pod section 40 Sliding material 41 Main body 41a Upper surface 41b Lower surface 42 Falling wall (restraint member)
43 Braking material 45 Braking plate

Claims (5)

A wind speed sensor and an earthquake sensor installed in a seismic isolation structure,
a pump that is driven according to the detection results of the wind speed sensor and the earthquake sensor;
a hydraulic jack device connected to the pump and provided in a seismic isolation layer between the upper structure and the lower structure;
A control unit that controls the pump,
The hydraulic jack device includes:
a piston housing fixed to the lower structure;
a piston that moves up and down by hydraulic pressure supplied from the pump;
a pod section disposed above the piston;
A restraining member is provided that restrains horizontal relative displacement between the piston housing part and the pod part,
The control unit includes:
If the detection result of the wind speed sensor exceeds a set value, the piston is raised to bring the pod part into contact with the lower surface of the upper structure,
When the detection result of the earthquake sensor is equal to or higher than the set value, and when the detection results of the wind speed sensor and the earthquake sensor are lower than the set value under normal conditions, the piston is lowered to move the pod part to the upper part. A windproof locking mechanism for a seismic isolation structure that is separated from the lower surface of the structure. The wind-resistant locking mechanism for a seismic isolation structure according to claim 1, wherein a sliding member is provided between the upper surface of the piston and the lower surface of the pod portion. The wind-resistant locking mechanism for a seismic isolation structure according to claim 1 or 2, wherein a damping material is provided on the upper surface of the pod portion, and a damping plate is provided on the lower surface of the upper structure. The windproof locking mechanism for a seismic isolation structure according to any one of claims 1 to 3, wherein one of the pumps is connected to a plurality of the hydraulic jack devices. The restraint member is configured with a falling wall extending downward from the periphery of the pod portion,
2. The falling wall is configured to enclose the piston accommodating portion at least partially in the height direction when the pod portion is in contact with the lower surface of the upper structure. - A windproof locking mechanism for a seismic isolation structure according to any one of claims 4 to 5.

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