JPH10102512A - Base isolation device for house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation device exerting an effective base isolation function without impairing comfortableness. SOLUTION: This base isolation device for a house is provided with a pair of hydraulic cylinders 3a, 3b protruded in opposite directions from a foundation bed 2 and a house groundsill 4 supported on the foundation bed 2 horizontally movably by both hydraulic cylinders 3a, 3b, and a pair of hydraulic cylinders 3a, 3b are connected by a hydraulic circuit 5 communicating the cylinders 3a, 3b with a valve opened when the inner pressure difference between the cylinders 3a, 3b becomes a fixed value or above. The cylinders 3a, 3b are operated to exert a base isolation function only when the force of the opening pressure or above is applied to the valve. The cylinders 3a, 3b are not operated by weak vibration or wind due to the setting of the opening pressure of the valve or a cutoff valve, and the cylinders 3a, 3b can be easily operated against the vibration having a possibility to break the house such as an earthquake to set the house to the base isolation state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolation system for a house, which has a function of isolating a house supported so as to be horizontally movable in a horizontal direction by a hydraulic cylinder in the event of an earthquake or the like. Related to the device.

[0002]

2. Description of the Related Art Generally, it is necessary to fix a house or the like to the ground, so that it has not usually been possible to isolate the house itself against vibration of the ground when an earthquake occurs. For this reason, houses have been provided with vibration resistance. In recent years, a vibration isolator for a house, which was developed for the purpose of isolating a house from vibrations of the ground to prevent danger, makes the house movable with respect to the ground so that power is not transmitted from the ground to the house. I have.

[0003]

Although the above-described renewal device attenuates the vibration of a house, it also operates by a minute high-frequency vibration or wind. For example, even if the ground vibrates minutely, such as when an automobile or a train passes near the house, the vibration isolation function works, and the house may move horizontally, or the house may move horizontally due to wind force. In other words, the house frequently moves depending on the location conditions of the house, which often causes a significant discomfort in living.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to provide a vibration isolator which does not operate by wind or minute vibrations caused by an automobile.

[0005]

In order to solve the above problems, a vibration isolator for a house according to the present invention comprises a pair of hydraulic cylinders each projecting in opposite directions from a base fixed to the ground; A liquid base having a house base supported on the base so as to be able to move horizontally by a pair of hydraulic cylinders, and having a valve opened when the internal pressure difference between the cylinders becomes equal to or more than a predetermined value, to communicate between the two cylinders. The pair of hydraulic cylinders are connected by a pressure circuit, and a shutoff valve is provided in the hydraulic circuit. Here, the house in the present invention is in a range that can be generally regarded as a rigid body, and can be applied to a building other than a building that is considered to have elasticity, such as a high-rise building.
With such a configuration, the vibration isolator operates by reducing the frequency response of the hydraulic circuit with respect to high-frequency micro-vibration caused by passing of an automobile or the like without using any other power or sensor, with only the hydraulic circuit. You can avoid it.

Further, with respect to the pressure difference in the cylinder caused by the force of the wind or the like, setting the valve opening pressure to be equal to or higher than the pressure difference in the cylinder can also prevent the vibration isolator from operating easily.

Further, even when the vibration isolator is activated and a slight vibration is caused even when the vibration isolator is set as described above, the coupling between the pair of hydraulic cylinders is interrupted by a shutoff valve so that the vibration isolator is not activated. can do.

That is, it is possible to operate the vibration isolator only for vibrations such as an earthquake that may destroy the house.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 and 2, a pair of hydraulic cylinders 3a, 3b projecting in opposite directions from a base 2 fixed to the ground by anchors 21 and the like, respectively,
A house base 4 supported on the base 4 so as to be able to move horizontally in the pair of hydraulic cylinders 3a and 3b, and a valve 51a which is opened when an internal pressure difference of the cylinders becomes more than a certain value. Or 51b with cylinders 3a and 3b
The hydraulic cylinder 3a of the pair is connected by a hydraulic circuit
And 3b are connected. For example, a pillar of a house is mounted on the base 4 by screws 41 or the like. Since there are generally many pillars in a house, it is of course possible to install as many as the number of pillars according to the number of pillars, or only some pillars within the range where the vibration isolation function is effectively exhibited. This vibration isolator may be provided, and other pillars may have only the function of being horizontally movable with respect to the ground. In this embodiment, there are two hydraulic passages, a and b, which communicate the two cylinders 3a, 3b, and the fluid passes either a, b depending on the flow direction by the check valves 53a, 53b. I do. A check valve 53a, a throttle valve 52a, and the above-described valve 51a are connected in series to the system path a, and valves 53b, 52b, and 51b are similarly connected in series to the system path b. The accumulator 55 is connected to the low pressure side of each of the systems a and b. Further, a shutoff valve 56 is provided at at least one of the portions where the system paths a and b meet and the cylinder 3a or 3b. Further, in addition to the paths a and b, there is a path c in parallel with these paths.
Is arranged. A spring 31 is provided in the cylinders 3a and 3b in a direction in which the rod projects.

The operation of this embodiment having such a configuration will be described below. For example, first, when an earthquake occurs and the ground moves in the direction A, the cylinder 3a receives a force proportional to the acceleration due to this movement in the direction of contraction, contracts the cylinder 3a, and expands the cylinder 3b. No fluid flows into the system path b by the check valve 53b. As a result, even if the ground moves in the direction A, the house does not move due to the expansion and contraction of the cylinders a and b, and a vibration isolation effect is obtained. Then, if the vibration of the ground stops in this state, the house automatically returns to the position where the forces of the two springs 31 are balanced. At this time, since the fluid flows through the throttle valve 54 of the system path c, the automatic return is performed gently, and no shock or the like occurs. When the ground moves in the direction A ', the fluid flows through the path b and the same operation as above is performed.

Next, when the ground vibrates at a high frequency due to the passage of an automobile or the like, the vibration isolator does not generally operate due to the elastic action of the hydraulic circuit. If the malfunction still occurs, the frequency responsiveness of the vibration isolator 1 is reduced by changing the opening areas of the throttle valves 52a and 52b and the capacity of the accumulator 55, and the malfunction can be easily prevented. Also, with respect to the internal pressure difference between the cylinders 3a and 3b caused by the force of the wind or the like, if the opening pressure of the valves 52a and 52b is set to be equal to or more than the cylinder internal pressure difference, the vibration isolator 1 can be easily formed.
Can not work. Even so, when the vibration isolator operates and causes minute vibration, or when it is desired to stop driving the vibration isolator for other reasons, the shut-off valve 56 is operated to shut off the hydraulic circuit between the cylinders 3a and 3b. Thus, the operation of the vibration isolator can be stopped. That is, it becomes possible to operate the vibration isolator 1 only for a vibration that may destroy a house such as an earthquake.

Further, in this embodiment, the throttle valve 52
a, 52b also have a function of increasing the damper force in proportion to the intensity of the earthquake, and the accumulator 55
It also has a function of absorbing liquid expansion and contraction due to a change in liquid pressure and a function of preventing cavitation due to instantaneous recoil of the cylinder.

Further, since the hydraulic circuit 5 including these valves and the like is housed in one valve block and formed into one package, the valve block can be replaced when a failure occurs or inspection is performed, and maintenance can be performed. It will be easier.

The cylinders 3a and 3b are mounted on the base 4 of the house.
On the other hand, since the housing 3 is vertically slidably contacted with the base 4 so that the cylinders 3a and 3b can be vertically moved, no excessive load is applied to the cylinders 3a and 3b in the vertical direction.

FIG. 3 is a sectional plan view of a vibration isolator according to another embodiment of the present invention in which two pairs of cylinders 3a, 3b and 3a ', 3b' are respectively arranged on the same plane in the vertical and horizontal directions. Is shown. With such a configuration, it is possible to have a vibration isolation function against vibrations in all horizontal directions,
At the same time, the whole device can be made compact.

The present invention is not limited only to the above-described embodiment. For example, the cylinder 3 of the pair
Instead of a and 3b, one double rod cylinder may be used. Install a vibration isolation device 1 on a base that supports the entire house.
Only one may be installed, and the position where the hydraulic circuit 5 is installed is not limited to the location shown in the figure.

In addition, the configuration of each section is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0018]

The present invention is embodied in the form described above and has the following effects.

According to the vibration isolator of a house according to the present invention, it is possible to easily prevent the vibration isolator from operating by reducing the frequency response of the hydraulic circuit with respect to high-frequency micro-vibration caused by the passage of an automobile or the like. Further, if the valve opening pressure is set to be equal to or higher than the cylinder pressure difference caused by the force of the wind or the like, the vibration isolator can be easily prevented from operating. Further, if the vibration isolation function is operated unnecessarily even in such a setting, the operation of the vibration isolation device can be forcibly stopped by operating the shutoff valve.

That is, it is possible to easily activate the vibration isolator only for vibrations that may destroy the house such as an earthquake, and the vibration isolator can work excessively during normal occupancy. Because it disappears, while keeping the living comfort
It has a special effect that a vibration isolator can be installed.

Further, since the present device operates only with the hydraulic circuit without the need for an external power source or sensor, it has few failures and is suitable for an emergency such as an earthquake.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a vibration isolator of a house showing one embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram of the embodiment.

FIG. 3 is a plan sectional view when two pairs of cylinders of the embodiment are provided.

[Explanation of symbols]

 1 ··· Vibration isolation device 2 ··· Base 3a, 3b ··· Hydraulic cylinder 4 ··· House base 5 ··· Hydraulic circuit 51a, 51b ··· Valve 56 ··· ..Shutoff valves

Claims (1)

[Claims] A pair of hydraulic cylinders projecting in opposite directions from a base fixed to the ground, and a house base supported on the base so as to be horizontally movable by the pair of hydraulic cylinders. A vibration isolator for a house, comprising: a valve that opens when the internal pressure difference between the cylinders becomes equal to or more than a certain value, and a hydraulic circuit that connects the two cylinders to each other to shut off communication between the two cylinders. A vibration isolation device for a house, which is provided with a valve.