JPH0913740A - Base isolated structure - Google Patents

Abstract

PURPOSE: To attenuate the vertical vibration acting on a structure at an earthquake or the like. CONSTITUTION: Damping devices 3 constituted of vertically actuating springs 4 and dampers 5 are installed at a plurality of positions between the base 2 supporting a structure 1 and the structure 1. In the dampers 5, a hydraulic pressure type having variable attenuating forces is used. A vertical direction sensor 7 detecting the vertical vibration is attached to respective dampers 5. A computerized attenuation adjuster 9 adjusting the attenuating force of respective dampers 5 in accordance with the detected value of respective vertical direction sensors 7 is installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation structure capable of attenuating a vibration applied to a structure such as a building due to an earthquake or the like, particularly a vertical vibration.

[0002]

2. Description of the Related Art As a measure for damping the vibration applied to a structure such as a building during an earthquake, conventionally, a laminated rubber and a damper are provided between a base supporting the structure and the structure. There is known a configuration for interposing.
However, although the above configuration is effective for horizontal vibration, there is a problem in that vertical vibration can hardly be damped.

An object of the present invention is to provide a seismic isolation structure capable of damping vertical vibrations.

[0004]

The seismic isolation structure according to claim 1 of the present invention comprises springs and dampers acting in the vertical direction at a plurality of positions between a base supporting the structure and the structure. A damping device configured is installed, the damper is a fluid pressure type whose damping force is variable, and each damper is provided with an up-down direction sensor for detecting up-down vibration, and according to the detection value of each up-down direction sensor. A damping force adjusting device for adjusting the damping force of each damper is provided. In the seismic isolation structure, the damper is capable of adjusting a damping force by changing a hydraulic pressure supplied from a hydraulic source, and the damping force adjusting device is interposed between the hydraulic source and the damper. Type hydraulic valve, and a computer type control device for calculating the control signal given to each hydraulic valve according to the detection value of each vertical direction sensor. In the seismic isolation structure, the control device, together with the detection value of the vertical direction sensor provided in each of the damper, including the detection value of the vertical direction sensor provided at a location different from the damper in the base, It is also possible to perform arithmetic processing of a control signal given to the hydraulic valve. In the seismic isolated structure, the structure is a building such as a house or a building, and the base is a device receiving foundation provided separately from the building foundation, and between the building foundation and the device receiving foundation. Alternatively, the vibration absorbing device may be interposed. In the seismic isolation structure, the structure may be a building, and the vibration absorbing device may be installed under a plurality of column bases of the building. In the seismic isolation structure, the structure may be a floor of a building, and the vibration absorbing device may be installed on a beam or a floor supporting slab of the building.

Further, in the seismic isolated structure according to claim 7 of the present invention, hydraulic cylinders for supporting the load of the structure are arranged at a plurality of places under the structure, and the hydraulic cylinders communicate with each other. A pipe is provided, and oil is sealed in a hydraulic system composed of these hydraulic cylinders and a communicating pipe.

[0006]

According to the seismic isolation structure of the first aspect of the present invention, the vibration in the vertical direction can be damped by the vibration absorbing device including the spring and the damper. The damping force of the damper is adjusted by the damping force adjusting device according to the detection value of the vertical sensor that detects the vertical vibration. In the seismic isolation structure, the damper is capable of adjusting a damping force by changing a hydraulic pressure supplied from a hydraulic pressure source, and the damping force adjusting device is an electromagnetic hydraulic valve and a computer type control device. In the case of the configuration, the damping force of the damper at each position can be instantaneously adjusted to a value corresponding to various damping forces required for each part of the building according to the detection value of each vertical sensor. Therefore, the vertical vibration can be effectively damped while supporting the building stably. When the control device calculates a necessary control signal including the detection value of the vertical direction sensor of each damper and the detection value of the vertical direction sensor provided at another location, the damper of each position is controlled. The damping force can be adjusted to a more appropriate value. The structure is a building such as a house or a building, the base is a device receiving foundation provided separately from the building foundation, and the vibration absorbing device is interposed between the building foundation and the device receiving foundation. In this case, the vertical vibration of the entire building can be effectively dampened. When the vibration absorbing device is installed under a plurality of column bases of a building, since vibration is absorbed at a portion supporting a vertical load, vertical vibration can be effectively damped. When the structure is the floor of the building and the vibration absorbing device is installed on the beam or floor supporting slab of the building,
Even if the body of the building vibrates, the vibration of the floor can be attenuated and the safety of people and objects on the floor can be maintained.

In the case of the seismic isolation structure according to claim 7 of the present invention, when the ground is vertically displaced due to an earthquake, each portion of the structure supported by each hydraulic cylinder is the same due to the principle of the communicating pipe. To be kept at a level. Therefore, vertical vibrations applied to the structure can be damped in a well-balanced manner.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. This seismic isolation structure has springs 4, dampers 5, dampers 5, at a plurality of locations between a building 1 such as a house or a building, which is a structure, and a device receiving foundation 2 which is a base for supporting the structure.
Further, the vibration absorbing device 3 composed of the laminated rubber 6 and the like is interposed respectively. Each damper 5 is provided with a vertical sensor 7 for detecting vertical vibrations, and a damping force adjusting device 9 for adjusting the damping force of each damper 5. The device receiving foundation 2 is a building foundation 1a obtained by excavating the ground GL as shown in FIG.
It is provided separately from. Further, another vertical sensor 8 for detecting vertical vibrations is installed at a position different from the damper 5 in the device receiving base 2. Normally, a plurality of vertical sensors 8 are provided in the basement around the building, for example, at least at four corners of the building.

The vibration absorbing device 3 is constructed by installing a spring 4 and a damper 5 acting in the vertical direction on a laminated rubber 6 acting mainly in the horizontal direction. The number of vibration absorbers 3 to be installed and the location of the vibration absorbers 3 may be adjusted according to the total weight of the building 1. The damper 5 is a hydraulic type whose damping force is variable as shown in FIG. That is, the damper 5 is the cylinder 10
The piston 11 is inserted into the piston 11 so as to be able to move up and down, and the throttle passage 11a such as an orifice is formed in the piston 11. The hydraulic pressure supplied from the hydraulic pump 12 via the pressure control valve 13 is controlled by the electromagnetic hydraulic valve 14. By switching operation, the piston 11 is moved up and down by feeding it to the upper and lower oil chambers 10a and 10b in the cylinder 10 to adjust the damping force. In addition to this example, the damper 5 may be a pneumatic type or the like.

In the damping force adjusting device 9 shown in FIG. 1, the hydraulic valves 14 interposed between a hydraulic pump 12 which is a hydraulic pressure source and a damper 5, and control signals to be given to the respective hydraulic valves 14 are provided. It is composed of a computer type control device 15 which performs arithmetic processing according to the detection values of the vertical direction sensors 7 and 8. A main power source (not shown) for driving the hydraulic power source 12 and the hydraulic valve 14 has a sensor for detecting an earthquake wave, and when the earthquake wave is received, the main power source is turned on and each hydraulic valve 14 becomes movable. Is done.

The operation of the above configuration will be described. Of the vibrations applied to the building 1 from the device receiving foundation 2 via the vibration absorbing device 3 during an earthquake, the horizontal vibration is absorbed by the laminated rubber 6 that constitutes the vibration absorbing device 3. On the other hand, the vibration in the vertical direction is caused by the spring 4 and the damper 5 forming the vibration absorbing device 3.
And is absorbed by the action of the damping force adjusting device 9. That is, a part of the vertical vibration is absorbed by the damper 5 and the damping force adjusting device 9 as follows. Normally, each hydraulic valve 14 is fully closed, and the hydraulic cylinder-shaped hydraulic damper 5 is in a hydraulically locked state. As for the vertical position of the building 1 or its foundation 1a, the position of the hydraulic damper 5 in the locked state is zero. When the vertical sensor 8 receives the seismic wave, the main power source (not shown) is turned on and each hydraulic valve 14 is brought into a movable state. When the sensor 7 attached to each damper 5 detects the vertical movement, the control device 1 is detected from the information of the sensors 7 and 8.
5, the hydraulic source 12, the hydraulic valve 14, the building 1 and the foundation 1
The hydraulic pressure in each hydraulic damper 5 is adjusted so that a remains at the zero position. In addition, a part of the vertical vibration is generated by the vibration absorbing device 3
Is absorbed by the elastic action of the spring 4 constituting the. In the above embodiment, the vibration absorbing device 3 is installed on the device receiving foundation 2 provided as a base, but the vibration absorbing devices 3 may be installed under a plurality of column bases of the building 1.

FIG. 5 shows a second embodiment of the present invention. The seismic isolation structure of this embodiment is a case where the structure is a floor 21 of a computer room or the like, and a floor support slab 23 made of deck concrete or the like installed on a girder 22 such as a steel beam is used as a base. , This slab 23 and floor support steel beam 24
And the vibration absorbing device 3 described above is interposed therebetween. The floor 21 is constructed by installing the floor panel 25 on the floor-supporting steel beam 24. Other configurations are the same as those in the above embodiment.

FIG. 6 shows a third embodiment of the present invention. The seismic isolation structure of this embodiment is also the case where the structure is the floor 21, and the steel beam 26 which is provided at a level lower than that of the steel beam 22 by 100 mm to 200 mm is used as a base. The vibration absorbing device 3 described above between the beam 26 and the steel beam 24 for receiving the floor.
Is interposed. The floor 21 is constructed by installing the floor panel 25 on the floor-supporting steel beam 24. Other configurations are the same as those in the above embodiment.

FIG. 7 shows a fourth embodiment of the present invention. In the seismic isolation structure of this embodiment, hydraulic cylinders 27 that support the load of the building 1 are arranged at a plurality of locations below the foundation 1a of the building 1, which is a structure, and between these hydraulic cylinders 27, respectively. Each hydraulic cylinder 27 is connected by a communication pipe 28.
Oil 29 is enclosed in a hydraulic system composed of the communication pipe 28 and the communication pipe 28. As the communication pipe 28, a flexible pipe made of, for example, rubber or the like is used so as to cope with the vertical fluctuation of the ground GL. In the case of this embodiment, FIG.
Even if the ground GL fluctuates up and down, the pistons 27a are kept at the same level by the flow of hydraulic oil between the hydraulic cylinders 27 in which hydraulic pressure is communicated by the communication pipe 28, and the building 1 is kept horizontal. Be drunk That is, the vertical vibration applied to the building 1 due to the earthquake is supported in a well-balanced manner by the interposition of the hydraulic cylinder 27, and the vibration damping effect is obtained.

[0015]

The seismic isolation structure according to claim 1 of the present invention is a vibration absorbing structure composed of springs and dampers acting in the vertical direction at a plurality of positions between the base supporting the structure and the structure. A device is installed, the damper is a fluid pressure type with a variable damping force, a vertical sensor for detecting vertical vibration is provided in each damper, and the damper of each damper is detected according to the detection value of each vertical sensor. Since the damping force adjusting device for adjusting the damping force is provided, it is possible to effectively absorb the vertical vibration applied to the structure due to an earthquake or the like. In the seismic isolation structure, the damper is capable of adjusting a damping force by changing a hydraulic pressure supplied from a hydraulic source, and the damping force adjusting device is interposed between the hydraulic source and the damper. When a hydraulic control valve and a computer-type control device that processes the control signal given to each hydraulic valve according to the detection value of each vertical direction sensor, The damping force of the damper at each position,
It is possible to instantly adjust the values to the different damping forces required for each part of the building. Therefore, the vertical vibration can be effectively damped while supporting the building stably. In the seismic isolated structure, the arithmetic processing of the control signal given to the hydraulic valve by the control device is provided at a position different from the damper in the base together with the detection value of the vertical direction sensor provided in each of the dampers. When the detection value of the vertical direction sensor is included, the damping force of the damper at each position can be adjusted to a more appropriate value. In the seismic isolated structure, the structure is a building such as a house or a building, and the base is a device receiving foundation provided separately from the building foundation, and between the building foundation and the device receiving foundation. When the vibration absorbing device is interposed in the above, the vertical vibration or vibration of the entire building can be effectively damped. In the seismic isolation structure, if the structure is a building and the vibration absorbing device is installed on a plurality of column bases of the building, since vibration is performed at a location supporting a vertical load, vibration in the vertical direction is generated. Can be effectively damped. In the seismic isolation structure, if the structure is the floor of the building and the vibration absorbing device is installed on a beam or a floor supporting slab of the building, even if the building frame vibrates, the vibration of the floor is attenuated. , Can keep the safety of people and objects on the floor.
In the seismic isolation structure according to claim 7 of the present invention, hydraulic cylinders for supporting the load of the structure are arranged at a plurality of positions under the structure, and communication pipes for communicating the hydraulic pressure of each hydraulic cylinder are provided. Since oil is filled in a hydraulic system consisting of hydraulic cylinders and communication pipes, when the ground is vertically displaced due to an earthquake, each part of the structure supported by each hydraulic cylinder is operated by the principle of communication pipes. Are kept at the same level.
Therefore, vertical vibrations applied to the structure can be damped in a well-balanced manner.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a seismic isolation structure according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the seismic isolation structure.

FIG. 3 is a vertical sectional view of the seismic isolation structure.

FIG. 4 is a schematic diagram showing a damper used in the base-isolated structure and its hydraulic system.

FIG. 5 is a fragmentary front view showing a seismic isolation structure according to a second embodiment of the present invention.

FIG. 6A is a plan view of a seismic isolation structure according to a third embodiment of the present invention, and FIG. 6B is a front view of a main part of the seismic isolation structure.

FIG. 7 is a configuration and operation explanatory view of a seismic isolation structure according to a fourth embodiment of the present invention.

[Explanation of symbols]

1 ... Building (structure), 2 ... Device receiving base (base), 3
... Vibration absorbing device, 4 ... Spring, 5 ... Damper, 7, 8 ... Vertical direction sensor, 9 ... Damping force adjusting device, 12 ... Hydraulic pump (hydraulic power source), 14 ... Hydraulic valve, 15 ... Control device, 21 ... Floor,
23 ... Floor support slab, 26 ... Steel beam, 27 ... Hydraulic cylinder, 28 ... Communication pipe, 29 ... Oil

Claims (7)

[Claims] 1. A vibration absorbing device including a spring and a damper acting in a vertical direction is installed at a plurality of positions between a base supporting a structure and the structure, and the damper is a fluid having a variable damping force. A seismic isolation system that is of a pressure type and is provided with a vertical sensor for detecting vertical vibration in each of the dampers and a damping force adjusting device for adjusting the damping force of each damper according to the detection value of each vertical sensor. Structure. 2. The damper is capable of adjusting a damping force by changing a hydraulic pressure supplied from a hydraulic source, and the damping force adjusting device is an electromagnetic type interposed between the hydraulic source and the damper. 2. The seismic isolation structure according to claim 1, wherein the seismic isolation structure is constituted by the hydraulic valve and the computer type control device for calculating a control signal given to each hydraulic valve according to a detection value of each vertical direction sensor. 3. The hydraulic pressure control device includes a detection value of a vertical direction sensor provided in each of the dampers, and a detection value of a vertical direction sensor provided at a position different from the damper on the base, The seismic isolation structure according to claim 2, which is for performing arithmetic processing of a control signal given to the valve. 4. The structure is a building such as a house or a building, and the base is a device receiving foundation provided separately from the building foundation, and the base is provided between the building foundation and the device receiving foundation. The seismic isolation structure according to claim 1, wherein a vibration absorbing device is interposed. 5. The seismic isolation structure according to claim 1, wherein the structure is a building, and the vibration absorbing device is installed under a plurality of column bases of the building. 6. The seismic isolation structure according to claim 1, wherein the structure is a floor of a building, and the vibration absorbing device is installed on a beam or a floor supporting slab of the building. 7. A hydraulic cylinder for supporting a load of the structure is arranged at a plurality of locations under a structure, a communication pipe for communicating hydraulic pressure of each hydraulic cylinder is provided, and the hydraulic cylinder and the communication pipe are configured. A seismic isolation structure in which oil is enclosed in a hydraulic system.