JPH1018644A - Base isolation device of house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bring out an effective base isolation function without spoiling a pleasant habitability by opening a valve to connect both cylinders when a difference between the inside pressures of two cylinders has reached a specified value. SOLUTION: This device is provided with a pair of hydraulic cylinders 3a, 3b projecting to mutually opposite sides from a base 2 and a sill 4 supported on the base 4 so as to be horizontally transferable by the hydraulic cylinders 3a, 3b. The hydraulic cylinders 3a, 3b are connected to each other in a hydraulic circuit 5 by a valve which is opened when the inside pressure difference between cylinders 3a, 3b has reached a specified value. In this way, these cylinders 3a, 3b are actuated by only a larger force than the opening pressure of the valve and the base isolation action works. And hence, these cylinders are not actuated by a fine vibration or a wind force but actuated only against a breakable vibration of a house caused by an earthquake or the like, in accordance with the setting of the opening pressure of the valve. In this way, the house can be easily kept in a vibration isolation condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolating device for a house, which has a function of moving a house horizontally movably supported by a hydraulic cylinder in a horizontal direction in the event of an earthquake or the like. is there.

[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 vibration isolator attenuates the vibration of a house, it also operates due to minute high-frequency vibration, wind and the like. 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.

[0004]

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 house base supported on the base so as to be able to move horizontally by a pair of hydraulic cylinders, and a valve that is opened when the internal pressure difference between the cylinders becomes equal to or more than a predetermined value allows the two cylinders to communicate with each other. The pair of hydraulic cylinders is connected by a hydraulic circuit that communicates. 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. By the way, with such a configuration, the vibration isolator can be reduced by reducing the frequency response of the hydraulic circuit against high-frequency micro-vibration caused by passing through an automobile or the like without using any other power or sensor with only the hydraulic circuit. Can be easily disabled. 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. That is, it becomes possible to operate the vibration isolation device only for a vibration such as an earthquake that may destroy the house.

[0005]

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, a vibration isolator 1 for a house includes a pair of hydraulic cylinders 3a and 3b projecting in opposite directions from a base 2 fixed to the ground by anchors 21 and the like, and the pair of hydraulic cylinders 3a and 3b. 3b, a house base 4 supported on the base 4 so as to be able to move horizontally, and a valve 51a which is opened when the internal pressure difference of the cylinder becomes more than a certain value.
Alternatively, the pair of hydraulic cylinders 3a and 3b are connected by a hydraulic circuit 5 that connects the cylinders 3a and 3b by 51b. For example, a pillar of a house is mounted on the base 4 with a screw 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 is a check valve 53a,
53b passes through either a or b depending on the flow direction. A check valve 53a, a throttle valve 52a, and the above-described valve 51a are connected in series to the system path a. Similarly, valves 53b, 52b, and 51b are 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. In addition to the paths a and b, a path c is provided in parallel with the paths a and b, and a throttle valve 54 is disposed in the path c. A spring 31 is provided in the cylinders 3a and 3b in a direction in which the rod projects.

[0006] The operation of the present embodiment having such a configuration will be described below. For example, if the earthquake first causes the ground to move in the direction A, the cylinder 3a receives a force proportional to the acceleration due to the movement in the direction of contraction, and the pressure in the cylinder 3a increases. When the ground moves beyond a certain acceleration, a corresponding pressure is generated, the valve 51a opens, and the fluid flows through the system a, so that the cylinder 3a contracts and the cylinder 3b expands. 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 cylinders a and b
Due to the expansion and contraction of the house, the house does not move and the vibration isolation effect is obtained. And
If the vibration of the ground stops in this state, the house automatically returns to a position where the forces of the two springs 31 are balanced. At this time, the route c
Since the fluid flows through the throttle valve 54, the automatic return is performed slowly 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 1 generally does not operate due to the elastic action of the hydraulic circuit. If a malfunction still occurs, the frequency response 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 larger than the cylinder internal pressure difference, the vibration isolator 1 does not easily operate. I can do it. In other words, the vibration isolator 1 is used only for vibrations that may destroy the house such as an earthquake.
Can be operated.

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 temperature, and a function of preventing cavitation due to instantaneous reversal operation of the cylinder. In addition, since the hydraulic circuit 5 including these valves and the like is housed in one valve block to form a single package, the valve block can be replaced in the event of a failure or inspection, thereby facilitating maintenance. .

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 moved up and down, no excessive load is applied to the cylinders 3a and 3b in the vertical direction.
In FIG. 3, two pairs of cylinders 3a, 3b and 3a ', 3
FIG. 10 is a plan sectional view of a vibration isolator according to another embodiment of the present invention, in which b ′ is arranged on the same plane in the vertical and horizontal directions. With such a configuration, it is possible to provide a vibration isolation function against vibrations in all directions in the horizontal direction, and at the same time, it is possible to make the entire apparatus 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 unit is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0011]

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, the vibration isolator can be easily prevented from operating by reducing the frequency responsiveness of the hydraulic circuit with respect to high-frequency micro-vibration caused by passage of an automobile or the like, and If the valve opening pressure is set to be equal to or higher than the cylinder pressure difference caused by such a force, the vibration isolator can be easily prevented from operating.
In other words, it is possible to easily activate the vibration isolator only for vibrations that may destroy houses such as earthquakes, and the vibration isolator does not work excessively during normal residence. In addition, there is an extraordinary effect that the vibration isolator can be installed while maintaining the comfort of living. Furthermore, since the present device does not require an external power source or sensor and operates only with the hydraulic circuit, 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]

 DESCRIPTION OF SYMBOLS 1 ... Vibration isolation device 2 ... Base 3a, 3b ... Hydraulic cylinder 4 ... House base 5 ... Hydraulic circuit 51a, 51b ... Valve

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 pair of hydraulic cylinders connected by a hydraulic circuit that allows communication between the two cylinders by a valve that is opened when an internal pressure difference between the cylinders becomes equal to or greater than a predetermined value. A vibration isolator for a house, characterized in that: