JP6120656B2 - Seismic isolation equipment - Google Patents

Description

  The present invention relates to a device for a seismic isolation mechanism that is supported by a foundation and supports a supported body. In particular, the present invention relates to a seismic isolation device suitable for exhibiting a seismic isolation function.

A seismic isolation mechanism may be used to support the supported body.
For example, the seismic isolation mechanism using the apparatus comprised with an air spring, an auxiliary tank, and communication piping is used.
There are two types of air springs: a bellows type (lantern type) air spring and a diaphragm type (membrane structure type) air spring.
Further, diaphragm type (membrane structure type) air springs include a rolling seal type and a rolling rope type.
The air spring of the rolling seal type has a metal inner cylinder and an outer cylinder.
The air spring of the rolling rope type has a metal inner cylinder and no outer cylinder. In the air spring of the rolling rope type, the rubber reinforcing fiber corrects the swelling.
The air spring has a feature that the spring height, load resistance, and spring constant can be independently selected.
Further, in combination with the height adjustment valve, the height of the spring can be kept constant regardless of the increase or decrease of the load.
Also, the load bearing force can be changed by simply changing the internal pressure with an air spring of the same size. Further, the spring constant can be changed by providing the auxiliary tank with the same load.
Further, when a vibration damping action is required, a diaphragm can be provided in the middle of the communication circuit that communicates the air spring and the auxiliary tank so that air damping can be used.
Further, since the air spring is composed of upper and lower metal fittings and a rubber film, it can insulate high-frequency vibrations and has an excellent soundproofing effect. In addition, since the structure is flexible, vibration isolation can be performed not only in the axial direction but also in the lateral direction and the rotational direction.
In addition, when the air spring and the auxiliary tank are combined, it is possible to further improve the seismic isolation performance for long-period vibration.
In addition, when a throttle is provided in the communication pipe that connects the air spring and the auxiliary tank, the natural frequency of the device changes, which affects the ability to isolate long-period vibrations.

  The present invention has been devised in view of the problem that when the throttle is provided in the communication pipe that communicates the air spring and the auxiliary tank, the natural frequency of the device changes and the performance of isolating long-period vibration is affected. Therefore, it is intended to provide a device for a seismic isolation mechanism that can exhibit a seismic isolation function with a simple configuration.

  In order to achieve the above object, a seismic isolation mechanism device that is supported by a foundation and supports a supported body according to the present invention, an air spring that is supported by the foundation and that can support the supported body, and a gas having a predetermined pressure separated from each other. And a plurality of auxiliary pipes that are separated from each other and communicate with the air spring and the one or more auxiliary tanks, respectively.

With the configuration of the present invention described above, the supported body can be supported by the air spring and the foundation. The auxiliary tank or tanks are separated from each other and filled with a gas having a predetermined pressure. A plurality of communication pipes are separated from each other and communicate with the air spring and the one or more auxiliary tanks.
As a result, even if a small-diameter communication pipe is used, the pipe resistance of the whole of the plurality of communication pipes does not increase, so that the seismic isolation can be achieved by damping the pipe resistance without extremely increasing the natural frequency of the entire equipment.

  Below, the apparatus for seismic isolation mechanisms which concerns on embodiment of this invention is demonstrated. The present invention includes any of the embodiments described below, or a combination of two or more of them.

The seismic isolation mechanism device according to the embodiment of the present invention includes a vibration composed of the air spring, the one or more auxiliary tanks, the plurality of communication pipes, and a mass corresponding to a vertical load acting on the air spring. Assuming a system, when the vibration system is subjected to displacement forced vibration with a specific amplitude, the horizontal axis representing the transfer characteristic of the vibration system is the frequency, and the vertical axis is the amplitude magnification. The peak point of the curve is below the zero frequency-amplitude magnification curve, which is the frequency-amplitude magnification curve of the zero-vibration system, assuming that the pipe resistance of each of the plurality of communication pipes is zero. It came to be located in the
With the configuration of the above embodiment, a vibration system including the air spring, one or more auxiliary tanks, a plurality of communication pipes, and a mass corresponding to a vertical load acting on the air spring is assumed. The transfer characteristic graph is a graph in which the horizontal axis representing the transfer characteristic of the vibration system when the vibration system receives a displacement forced vibration with a specific amplitude is the frequency, and the vertical axis is the amplitude magnification. The zero frequency-amplitude magnification curve is a frequency-amplitude magnification curve of a zero vibration system that is a vibration system assuming that the pipe resistance of each of the plurality of communication pipes is zero. In the transfer characteristic graph, the peak point of the frequency-amplitude magnification curve is located below the zero frequency-amplitude magnification curve.
As a result, seismic isolation can be achieved by damping the piping resistance without extremely increasing the natural frequency of the entire device.

In the seismic isolation mechanism device according to the embodiment of the present invention, when the air spring expands and contracts at a specific amplitude by a specific frequency that is a specific frequency, the plurality of communication pipes have a specific pipe resistance. Assuming a vibration system each having a specific pipe resistance, and including the air spring, one or more auxiliary tanks, a plurality of communication pipes, and a mass corresponding to a vertical load acting on the air spring, The total of the pipe resistances of the plurality of communication pipes in the transmission characteristic graph in which the horizontal axis representing the transmission characteristics of the vibration system when the vibration system receives displacement forced vibration with a specific amplitude is the frequency and the vertical axis is the amplitude magnification Is the vibration system when the peak point of the frequency-amplitude magnification curve is assumed to be zero for each of the plurality of communication pipes. Frequency- Zero frequency is the width ratio curve - came to be positioned below the amplitude magnification curve.
With the configuration of the above embodiment, when the air spring expands and contracts at a specific amplitude by a specific frequency that is a specific frequency, a plurality of specific pipe resistances each having a specific pipe resistance are provided to each of the plurality of communication pipes. Have. A vibration system including the air spring, one or more auxiliary tanks, a plurality of communication pipes, and a mass corresponding to a vertical load acting on the air spring is assumed. The transfer characteristic graph is a graph in which the horizontal axis representing the transfer characteristic of the vibration system when the vibration system receives a displacement forced vibration with a specific amplitude is the frequency, and the vertical axis is the amplitude magnification. The zero frequency-amplitude magnification curve is a frequency-amplitude magnification curve of a zero vibration system that is a vibration system assuming that the pipe resistance of each of the plurality of communication pipes is zero. In the transfer characteristic graph, the peak point of the frequency-amplitude magnification curve when the sum of the pipe resistances of the plurality of communication pipes is equal to the sum of the plurality of specific pipe resistances is positioned below the zero frequency-amplitude magnification curve. became.
As a result, seismic isolation can be achieved by damping the piping resistance without extremely increasing the natural frequency of the entire device.

The seismic isolation mechanism device according to the embodiment of the present invention has a zero vibration in which the frequency at the peak point of the frequency-amplitude magnification curve is the frequency at the zero peak point which is the peak point of the zero frequency-amplitude magnification curve. The number substantially coincides within the error range, and the amplitude magnification at the peak point of the frequency-amplitude magnification curve is as small as possible.
With the configuration of the above embodiment, the frequency at the peak point of the frequency-amplitude magnification curve is within the error range to the zero frequency, which is the frequency at the zero peak point, which is the peak point of the zero frequency-amplitude magnification curve. Match substantially. The amplitude magnification at the peak point of the frequency-amplitude magnification curve is as small as possible.
As a result, seismic isolation can be achieved by damping the piping resistance without extremely increasing the natural frequency of the entire device.

In the seismic isolation mechanism device according to the embodiment of the present invention, at least one of the plurality of communication pipes is not provided with a throttle element for increasing the gas pipe resistance, and the plurality of communication pipes. The other at least one communication pipe is provided with a throttle element for increasing the gas pipe resistance.
According to the configuration of the above embodiment, at least one of the plurality of communication pipes is not provided with a throttle element for increasing the gas pipe resistance. A throttle element for increasing the pipe resistance of gas is provided in at least one other communication pipe among the plurality of communication pipes.
As a result, seismic isolation can be achieved by air attenuation by the throttle element without extremely increasing the natural frequency of the entire device.

  In order to achieve the above object, a seismic isolation mechanism device that is supported by a foundation and supports a supported body according to the present invention, an air spring that is supported by the foundation and that can support the supported body, and a gas having a predetermined pressure separated from each other. And a plurality of communication pipes that are separated from each other and communicate with the air spring and the plurality of auxiliary tanks, respectively, and at least one of the communication pipes. The pipe is not provided with a throttle element for increasing the pipe resistance of gas, and at least one other of the plurality of communication pipes is provided with a throttle element for increasing the pipe resistance of gas. It was supposed to be.

With the configuration of the present invention, the air spring is supported by the foundation and can support the supported body. The plurality of auxiliary tanks are separated from each other and filled with a gas having a predetermined pressure. The plurality of communication pipes are separated from each other and communicate the air spring and the plurality of auxiliary tanks with each other. A throttle element for increasing the pipe resistance of gas is not provided in at least one of the plurality of communication pipes. A throttle element for increasing the pipe resistance of gas is provided in at least one other communication pipe among the plurality of communication pipes.
As a result, seismic isolation can be achieved by air attenuation by the throttle element without extremely increasing the natural frequency of the entire device.

  In order to achieve the above object, a seismic isolation mechanism device that is supported by a foundation and supports a supported body according to the present invention, an air spring that is supported by the foundation and that can support the supported body, and a gas having a predetermined pressure separated from each other. An auxiliary tank filled with a plurality of communication pipes that are separated from each other and that communicate with the air spring and the auxiliary tank in parallel, and at least one of the communication pipes is connected to the communication pipe Does not provide a throttle element for increasing gas piping resistance, and at least one other of the plurality of communication pipes is provided with a throttle element for increasing gas pipe resistance; did.

With the configuration of the present invention, the air spring is supported by the foundation and can support the supported body. The auxiliary tanks are separated from each other and filled with a gas having a predetermined pressure. A plurality of communication pipes arranged in parallel are separated from each other and communicate the air spring and the plurality of auxiliary tanks. A throttle element for increasing the pipe resistance of gas is not provided in at least one of the plurality of communication pipes. A throttle element for increasing the pipe resistance of gas is provided in at least one other communication pipe among the plurality of communication pipes.
As a result, seismic isolation can be achieved by air attenuation by the throttle element without extremely increasing the natural frequency of the entire device.

  In order to achieve the above object, a seismic isolation mechanism device that is supported by a foundation and supports a supported body according to the present invention, an air spring that is supported by the foundation and that can support the supported body, and a gas having a predetermined pressure separated from each other. And a plurality of communication pipes that are separated from each other and communicate with the air spring and the plurality of auxiliary tanks in series so as to be in series, at least one of the plurality of communication pipes. One of the communication pipes is not provided with a throttle element for increasing the gas pipe resistance, and the throttle element for increasing the gas pipe resistance of the at least one other communication pipe among the plurality of the communication pipes Provided.

With the configuration of the present invention, the air spring is supported by the foundation and can support the supported body. The plurality of auxiliary tanks are separated from each other and filled with a gas having a predetermined pressure. The plurality of communication pipes are separated from each other, and communicate the air spring and the plurality of auxiliary tanks in series. A throttle element for increasing the pipe resistance of gas is not provided in at least one of the plurality of communication pipes. A throttle element for increasing the pipe resistance of gas is provided in at least one other communication pipe among the plurality of communication pipes.
As a result, seismic isolation can be achieved by air attenuation by the throttle element without extremely increasing the natural frequency of the entire device.

As described above, the seismic isolation mechanism device according to the present invention has the following effects due to its configuration.
Since the plurality of auxiliary tanks are communicated with the air spring supporting the supported body by the plurality of communication pipes, the pipe resistance of the whole of the plurality of communication pipes is large even if a communication pipe having a small diameter is employed. In addition, the seismic isolation can be achieved by damping the piping resistance without extremely increasing the natural frequency of the entire device.
In addition, assuming a vibration system that supports mass with the air spring, the plurality of auxiliary tanks, and a plurality of communication pipes, the peak point of the frequency-amplitude magnification curve in the transmission characteristic graph of the vibration system is zero pipe resistance. Since it is positioned below the assumed zero frequency-amplitude magnification curve of the zero vibration system, it can be isolated by damping by piping resistance without extremely increasing the natural frequency of the entire device.
Further, assuming a vibration system that supports mass with the air spring, the plurality of auxiliary tanks, and a plurality of communication pipes, the vibration frequency in the transfer characteristic graph of the vibration system equivalent to the total pipe resistance of the plurality of communication pipes -The peak point of the amplitude magnification curve is located below the zero frequency of the zero vibration system assuming that the piping resistance is zero.-The piping of the amplitude magnification curve without excessively increasing the natural frequency of the entire equipment. Seismic isolation is possible by damping with resistance.
In addition, the frequency at the peak of the vibration frequency-amplitude magnification curve of the vibration system is almost equal to the zero frequency, which is the frequency at the zero peak point, and the amplitude magnification is made as small as possible. Seismic isolation can be achieved by damping the piping resistance without raising the natural frequency extremely.
In addition, since the throttle element is not provided in at least one of the communication pipes, and the throttle element is provided in at least one of the connection pipes, air attenuation by the throttle element without extremely increasing the natural frequency of the entire device. Can be isolated.

The plurality of auxiliary tanks are connected to the air spring supporting the supported body by the plurality of communication pipes, the throttle elements are not provided in at least one of the communication pipes, and the throttle elements are provided in at least one of the connection pipes. As a result, seismic isolation can be achieved by air attenuation by the throttle element without extremely increasing the natural frequency of the entire device.
The auxiliary tank is connected to the air spring supporting the supported body by the plurality of communication pipes arranged in parallel, and the throttle element is not provided in at least one of the communication pipes, and the throttle element is provided in at least one of the connection pipes. Since it is provided, it can be isolated by air attenuation by the throttle element without extremely increasing the natural frequency of the entire device.
A plurality of the auxiliary tanks are connected to the air spring supporting the supported body so as to be connected in series by the plurality of communication pipes, and at least one of the communication pipes is not provided with the throttle element, and at least one of the connection pipes Since the diaphragm element is provided in the base, the seismic isolation can be performed by air attenuation by the diaphragm element without extremely increasing the natural frequency of the entire device.
Accordingly, it is possible to provide a device for a seismic isolation mechanism that can exhibit a seismic isolation function with a simple configuration.

1 is an overall view of a seismic isolation mechanism according to an embodiment of the present invention. It is a top view of the seismic isolation mechanism which concerns on embodiment of this invention. It is AA sectional drawing of the seismic isolation mechanism which concerns on embodiment of this invention. It is BB sectional drawing of the seismic isolation mechanism which concerns on embodiment of this invention. It is a partial side view of the seismic isolation mechanism which concerns on embodiment of this invention. It is a partial front view of the seismic isolation mechanism which concerns on embodiment of this invention. It is a partial top view of the seismic isolation mechanism which concerns on embodiment of this invention. It is the system diagram 1 of the apparatus for seismic isolation mechanisms concerning 1st embodiment of this invention. It is the system diagram 2 of the apparatus for seismic isolation mechanisms concerning 1st embodiment of this invention. It is the system diagram 3 of the apparatus for seismic isolation mechanisms concerning 1st embodiment of this invention. It is a transmission characteristic graph of the apparatus for seismic isolation mechanisms concerning 1st embodiment of this invention. It is the elements on larger scale of the transmission characteristic graph of the apparatus for seismic isolation mechanisms concerning 1st embodiment of this invention. It is an amplitude-load graph of the apparatus for seismic isolation mechanisms concerning 1st embodiment of this invention. It is the system diagram 1 of the apparatus for seismic isolation mechanisms concerning 2nd embodiment of this invention. It is a transmission characteristic graph of the apparatus for seismic isolation mechanisms concerning 2nd embodiment of this invention. It is the system diagram 2 of the apparatus for seismic isolation mechanisms concerning 2nd embodiment of this invention. It is the system diagram 3 of the apparatus for seismic isolation mechanisms concerning 2nd embodiment of this invention.

Hereinafter, modes for carrying out the present invention will be described.
First, the seismic isolation mechanism using the seismic isolation mechanism device according to the first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view of a seismic isolation mechanism according to an embodiment of the present invention. FIG. 2 is a plan view of the seismic isolation mechanism according to the embodiment of the present invention. FIG. 3 is an AA cross-sectional view of the seismic isolation mechanism according to the embodiment of the present invention. FIG. 4 is a BB cross-sectional view of the seismic isolation mechanism according to the embodiment of the present invention. FIG. 5 is a partial side view of the seismic isolation mechanism according to the embodiment of the present invention. FIG. 6 is a partial front view of the seismic isolation mechanism according to the embodiment of the present invention. FIG. 7 is a partial plan view of the seismic isolation mechanism according to the embodiment of the present invention. FIG. 8 is a system diagram 1 of the seismic isolation device according to the first embodiment of the present invention. FIG. 9 is a system diagram 2 of the seismic isolation device according to the first embodiment of the present invention. FIG. 10 is a system diagram 3 of the seismic isolation device according to the first embodiment of the present invention. FIG. 11 is a transmission characteristic graph of the seismic isolation device according to the first embodiment of the present invention. FIG. 12 is a partially enlarged view of a transfer characteristic graph of the seismic isolation device according to the first embodiment of the present invention.
Here, the seismic isolation includes vibration control in addition to the seismic isolation in the narrow sense.

  The seismic isolation mechanism according to the first embodiment of the present invention is a mechanism that is supported by a foundation and supports a supported body, and is a seismic isolation mechanism device 10, a floor steel frame 20, a damper 30, an automatic leveling device 50, and a floor. And the structure 70.

The seismic isolation device 10 is a device that is supported by a foundation and supports a supported body using a compressive force of gas, and includes an air spring 100.
The seismic isolation mechanism device 10 may include an air spring 100, an auxiliary tank 200, and a communication pipe 300.
The seismic isolation device 10 may include an air spring 100, a single auxiliary tank 200, and a communication pipe 300.
FIG. 9 shows an example in which one auxiliary tank 200 and a plurality of communication pipes 300 are provided for one air spring 100.
The seismic isolation mechanism device 10 may include an air spring 100, a plurality of auxiliary tanks 200, and a plurality of communication pipes 300.
8 and 10 show an example in which a plurality of auxiliary tanks 200 and a plurality of communication pipes 300 are provided corresponding to one air spring 100.
For example, the seismic isolation mechanism device 10 may include an air spring 100, M auxiliary tanks 200, and M communication pipes 300.

The auxiliary tank 200 is a tank filled with a gas having a predetermined pressure.
The plurality of auxiliary tanks 200 are separated from each other.
The auxiliary tank 200 is composed of one or a plurality of pressure tanks.
When the auxiliary tank 200 includes a plurality of pressure tanks, the plurality of pressure tanks are communicated in series or in parallel.

The plurality of communication pipes 300 are pipes that are separated from each other and communicate with the air spring and one or more auxiliary tanks.
The plurality of communication pipes 300 may be pipes that are separated from each other and communicate with an air spring and a single auxiliary tank.
The communication pipe 300 may be pipes that are separated from each other and communicate with the air spring and the plurality of auxiliary tanks.
For example, the communication pipe 300 has one end connected to the auxiliary tank 200 and the other end connected to the air communication port 162 of the air spring 100. The other communication pipe 300 has one end connected to the other auxiliary tank 200 and the other end connected to the air communication port 162 of the air spring 100.
FIG. 8 shows that a plurality of communication pipes 300 are separated from each other, and one air spring 100 and three auxiliary tanks 200 communicate with each other.
The plurality of communication pipes 300 may be separated from each other, arranged in parallel, and communicate the air spring 100 and the auxiliary tank 200.
For example, the communication pipe 300 has one end connected to the auxiliary tank 200 and the other end connected to the air communication port 162 of the air spring 100.
FIG. 9 shows that three communication pipes 300 are separated from each other, arranged in parallel, and communicate with one air spring 100 and one auxiliary tank 200.
The plurality of communication pipes 300 are separated from each other and communicate the air spring 100 and the plurality of auxiliary tanks 200 so as to be connected in series. For example, one communication pipe 300 has one end connected to the auxiliary tank 200 and the other end. Is connected to the air communication port 162 of the air spring 100. The other communication pipe 300 has one end connected to the auxiliary tank 200 and the other end connected to the other auxiliary tank 200.
FIG. 10 shows that a plurality of communication pipes 300 are separated from each other, and one air spring 100 and three auxiliary tanks 200 are communicated in series.

Assuming a vibration system composed of the air spring 100, one or more auxiliary tanks 200, a plurality of communication pipes 300, and a mass corresponding to a vertical load acting on the air spring 100, the vibration system is forced to displace with a specific amplitude. In the transfer characteristic graph in which the horizontal axis representing the transmission characteristics of the vibration system when receiving vibration is the frequency and the vertical axis is the amplitude magnification, the peak point of the frequency-amplitude magnification curve is assumed to be the pipe resistance of the plurality of communication pipes 300. It is located below the zero frequency-amplitude magnification curve, which is the frequency-amplitude magnification curve of the zero-vibration system, which is the vibration system when each is assumed to be zero.
A vibration system including an air spring 100, a plurality of auxiliary tanks 200, a plurality of communication pipes 300, and a mass corresponding to a vertical load acting on the air spring 100 is assumed.
The transfer characteristic graph is a graph in which the horizontal axis representing the transfer characteristic of the vibration system when the vibration system receives displacement forced vibration with a specific amplitude is the frequency, and the vertical axis is the amplitude magnification.
For example, in the transfer characteristic graph, the pipe resistance of the plurality of communication pipes 300 is selected so that the peak point P of the frequency-amplitude magnification curve is positioned below the zero frequency-amplitude magnification curve.
The zero frequency-amplitude magnification curve is a frequency-amplitude magnification curve of a zero vibration system that is a vibration system assuming that the pipe resistance of each of the plurality of communication pipes 300 is zero.
Hereinafter, the specific amplitude is referred to as a specific amplitude.

When the air spring 100 expands and contracts at a specific amplitude with a specific frequency that is a specific frequency, the plurality of communication pipes 300 each have a plurality of specific pipe resistances that are specific pipe resistances. Assuming a vibration system composed of a plurality of auxiliary tanks 200, a plurality of communication pipes 300, and a mass corresponding to a vertical load acting on the air spring 100, vibration when the vibration system receives displacement forced vibration with a specific amplitude. Frequency-amplitude magnification when the sum of the pipe resistances of a plurality of communication pipes is equal to the sum of a plurality of specific pipe resistances in the transfer characteristic graph in which the horizontal axis representing the transfer characteristics of the system is the frequency and the vertical axis is the amplitude magnification A zero frequency-amplitude magnification curve that is a frequency-amplitude magnification curve of a zero-vibration system that is a vibration system when the peak point P of the curve is assumed to be zero in each of the plurality of communication pipes. It becomes as located on the lower Ri.
For example, the pipe resistance is the pipe resistance at the maximum flow velocity in the communication pipe when the air spring expands and contracts with a specific amplitude.
When the air spring 100 expands and contracts with a specific amplitude at a specific frequency that is a specific frequency, the plurality of communication pipes 300 each have a plurality of specific pipe resistances that are specific pipe resistances.
A vibration system including an air spring 100, one or more auxiliary tanks 200, a plurality of communication pipes 300, and a mass corresponding to a vertical load acting on the air spring 100 is assumed.
The transfer characteristic graph is a graph in which the horizontal axis representing the transfer characteristic of the vibration system when the vibration system receives displacement forced vibration with a specific amplitude is the frequency, and the vertical axis is the amplitude magnification.
For example, in the transfer characteristic graph, the peak point P of the frequency-amplitude magnification curve when the sum of the pipe resistances of the plurality of communication pipes is equal to the sum of the plurality of specific pipe resistances is located below the zero frequency-amplitude magnification curve. Select the pipe resistance of multiple communication pipes.
The zero frequency-amplitude magnification curve is a frequency-amplitude magnification curve of a zero vibration system that is a vibration system assuming that the pipe resistance of each of the plurality of communication pipes is zero.

The frequency at the peak point of the frequency-amplitude magnification curve substantially matches the zero frequency which is the frequency at the zero peak point P0 which is the peak point P of the zero frequency-amplitude magnification curve within the error range, The amplitude magnification at the peak point P of the frequency-amplitude magnification curve is as small as possible.
For example, the frequency at the peak point P of the frequency-amplitude magnification curve is substantially within the error range D to the zero frequency which is the frequency at the zero peak point P0 which is the peak point of the zero frequency-amplitude magnification curve. The pipe resistances of the plurality of communication pipes are selected so that the amplitude magnification at the peak point of the frequency-amplitude magnification curve is as small as possible.

In order to set the pipe resistance of the communication pipe 300 to a desired pipe resistance, for example, the total length and the pipe inner diameter of the communication pipe 300 are selected, or the throttle element 320 is added to the communication pipe 300.
A method for confirming that the transfer characteristic of the vibration system has a desired characteristic will be described below.
The seismic isolation mechanism device in which the air spring 100, the plurality of auxiliary tanks 200, and the plurality of communication pipes 300 are assembled is set in the displacement forced vibration exciter.
After adjusting the internal pressure of the seismic isolation device, the air spring 100 is subjected to forced displacement displacement at a specific frequency with a specific amplitude.
The relationship between the amplitude of the air spring 100 and the load is recorded in time series.
When the amplitude and load of the air spring 100 are plotted on the amplitude-load graph, an elliptical locus can be obtained.
As the pipe resistance of the communication pipe increases, the shape of the ellipse approaches a circle.
Theoretically, if the pipe resistance of the communication pipe is zero, a linear locus is obtained.
It is assumed that the inclination of the major axis of the elliptic loop of the recorded amplitude and load of the air spring is the apparent spring constant K.
The apparent spring constant K is calculated from the recorded loop of the amplitude and load of the air spring, and the natural frequency of the seismic isolation device is calculated from the apparent spring constant K and the mass corresponding to the load.
When the calculated natural frequency substantially matches the zero frequency within the error range, it can be confirmed that the natural frequency has not shifted to a range that is biased toward high frequency components.
Furthermore, it can be confirmed from the elliptical shape whether or not the desired pipe resistance has been reached.

The at least one communication pipe 300 of the plurality of communication pipes 300 is not provided with a throttle element for increasing the pipe resistance of the gas, and at least one of the plurality of communication pipes 300 is provided with gas gas. You may provide the throttle element for enlarging piping resistance.
For example, the throttle element is an orifice or a choke.
For example, one communication pipe 300 includes a pipe 310 and a throttle element 320.
For example, one communication pipe 300 is composed of the pipe 310 and does not include the throttle element 320.
FIG. 14, FIG. 16 or FIG. 17 shows a case where one communication pipe 300 is composed of a pipe 310 and a throttle element 320, and two communication pipes 300 are composed of only the pipe 310.
FIG. 14 shows that a plurality of communication pipes 300 are separated from each other, one air spring 100 and three auxiliary tanks 200 communicate with each other, a throttle element 320 is provided in one communication pipe, and the other two The example which is not provided in the individual communication piping 300 is shown.
In FIG. 16, three communication pipes 300 are separated from each other, arranged in parallel, communicate one air spring 100 and one auxiliary tank 200, and provide a throttle element 320 in one communication pipe. The example which does not provide in the other two communication piping 300 is shown.
In FIG. 17, a plurality of communication pipes 300 are separated from each other, and one air spring 100 and three auxiliary tanks 200 are connected in series so that a throttle element 320 is provided in one communication pipe 300. The example which does not provide in the other two communication piping 300 is shown.
For example, an example is shown in which the throttle element 320 is provided in the communication pipe 300 that communicates between the auxiliary tank 200 and the auxiliary tank 200 and is not provided in other communication pipes.

FIG. 11 and FIG. 12 are graphs of transmission characteristics in a state where a mass corresponding to a vertical load is placed on a seismic isolation device composed of an air spring 100, three auxiliary tanks 200, and three communication pipes. Show.
In the figure, the curve shown by the two-dot broken line is a zero frequency-amplitude magnification curve.
In the figure, a line indicated by a broken line is a locus of the position of the peak point P when the pipe resistance is changed asymptotically.
The pipe resistance of the communication pipe indicated by A is smaller than the pipe resistance of the communication pipe indicated by B.
The pipe resistance of the communication pipe indicated by B is smaller than the pipe resistance of the communication pipe indicated by C.
The pipe resistance of the communication pipe indicated by C is smaller than the pipe resistance of the communication pipe indicated by D.
For example, the communication pipe is selected when the peak point P is located below the zero frequency-amplitude magnification curve indicated by the two-dot broken line.
For example, the communication pipe is selected when the peak point P falls within the error range D around the zero peak point P0.
The error range is a range of errors that cannot be avoided in production, measurement, and the like.
Therefore, it is possible to maintain a high performance for isolating the acceleration of the frequency within the range not deviated to the high frequency component of the acceleration of the earthquake.

The floor steel frame 20 is a steel frame structure that supports the floor structure 70.
The floor steel frame 20 has a structure in which steel frames are assembled in a cross-beam shape.
The floor steel frame 20 is supported by a plurality of seismic isolation mechanism devices 10 supported by a foundation.

The damper 30 is a device that attenuates vibration energy when the floor steel frame 20 vibrates.
For example, the damper 30 is a hydraulic damper.
A plurality of dampers 30 are provided between the foundation and the floor steel frame 20.

The automatic leveling device 50 is a device that automatically controls the level of the floor steel frame 20.
A plurality of automatic leveling devices 50 may be provided in each of the plurality of seismic isolation device 10.
For example, the automatic leveling device 50 sucks or discharges air to the air spring 100 of the seismic isolation mechanism device 10 so that the height position of the floor steel frame 20 is maintained at a predetermined height.
The automatic leveling device 50 discharges air from the air spring 100 of the seismic isolation mechanism device 10 when the height position of the floor steel frame 20 becomes higher than a predetermined height, and when the height position of the floor steel frame 20 becomes lower than the predetermined height. Air is sucked into the air spring 100 of the seismic isolation device 10 to keep the height of the floor steel frame 20 at a predetermined height.

The floor structure 70 is a structure that forms a floor.
The floor structure 70 is supported by the floor steel frame 20 at a plurality of locations.

Next, the seismic isolation mechanism using the seismic isolation mechanism apparatus according to the second embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view of a seismic isolation mechanism according to an embodiment of the present invention. FIG. 2 is a plan view of the seismic isolation mechanism according to the embodiment of the present invention. FIG. 3 is an AA cross-sectional view of the seismic isolation mechanism according to the embodiment of the present invention. FIG. 4 is a BB cross-sectional view of the seismic isolation mechanism according to the embodiment of the present invention. FIG. 5 is a partial side view of the seismic isolation mechanism according to the embodiment of the present invention. FIG. 6 is a partial front view of the seismic isolation mechanism according to the embodiment of the present invention. FIG. 7 is a partial plan view of the seismic isolation mechanism according to the embodiment of the present invention. FIG. 14 is a system diagram 1 of a seismic isolation device according to the second embodiment of the present invention. FIG. 15 is a transfer characteristic graph of the seismic isolation device according to the second embodiment of the present invention. FIG. 16 is a system diagram 2 of the seismic isolation device according to the second embodiment of the present invention. FIG. 17 is a third system diagram of the seismic isolation mechanism device according to the second embodiment of the present invention.

  The seismic isolation mechanism according to the second embodiment of the present invention is a mechanism that is supported by a foundation and supports a supported body, and the seismic isolation mechanism device 10, the floor steel frame 20, the damper 30, the automatic leveling device 50, and the floor. And the structure 70.

The seismic isolation device 10 is a device that is supported by a foundation and supports a supported body using a compressive force of gas, and includes an air spring 100.
The seismic isolation mechanism device 10 may include an air spring 100, an auxiliary tank 200, and a communication pipe 300.
The seismic isolation mechanism device 10 may include an air spring 100, a plurality of auxiliary tanks 200, and a plurality of communication pipes 300.

The auxiliary tank 200 is a tank filled with a gas having a predetermined pressure.
The plurality of auxiliary tanks 200 are separated from each other.
The auxiliary tank 200 is composed of one or a plurality of pressure tanks.
When the auxiliary tank 200 includes a plurality of pressure tanks, the plurality of pressure tanks are communicated in series or in parallel.

The plurality of communication pipes 300 are pipes that are separated from each other and communicate with the air spring and one or more auxiliary tanks.
The plurality of communication pipes 300 may be pipes that are separated from each other and communicate with an air spring and a single auxiliary tank.
The communication pipe 300 may be pipes that are separated from each other and communicate with the air spring and the plurality of auxiliary tanks.
The at least one communication pipe 300 of the plurality of communication pipes 300 is not provided with a throttle element for increasing the pipe resistance of gas, and the other at least one communication pipe 300 of the plurality of communication pipes 300 has a gas. A throttle element for increasing the pipe resistance may be provided.
For example, the throttle element is an orifice or a choke.
For example, one communication pipe 300 includes a pipe 310 and a throttle element 320.
For example, one communication pipe 300 is composed of the pipe 310 and does not include the throttle element 320.
FIG. 14, FIG. 16 or FIG. 17 shows a case where one communication pipe 300 is composed of a pipe 310 and a throttle element 320, and two communication pipes 300 are composed of only the pipe 310.
The description of the structure of FIG. 14, 16 or FIG. 17 is the same as that according to the first embodiment, and thus the description thereof is omitted.

FIG. 15 shows the transmission characteristics and frequency in a state where a temporary load is placed on the seismic isolation device comprising the air spring 100, three auxiliary tanks 200, and three communication pipes shown in FIG. The relationship is shown.
A is a case where none of the three communication pipes has a throttle element.
B is a case where one communication pipe has a throttle element and the other two communication pipes do not have a throttle element.
C is a case where two communication pipes have a throttle element and one communication pipe does not have a throttle element.
D is a case in which all three communication pipes have a throttle element.
E is a case without an auxiliary tank for reference.
At least one communication pipe 300 of the plurality of communication pipes 300 is not provided with a throttle element for increasing the pipe resistance of gas, and at least one other communication pipe 300 of the plurality of communication pipes 300 is made of gas. If a throttle element is provided to increase the pipe resistance, the seismic isolation performance of the seismic isolation device is improved at a relatively low frequency, and the damping effect is within a range that does not tend to be relatively high frequency components. It can be seen that
In addition, if a throttle element for increasing the gas pipe resistance is provided in all of the plurality of communication pipes 300, the seismic isolation performance of the seismic isolation mechanism equipment changes to a relatively high frequency, resulting in a relatively high vibration. It can be seen that the attenuation effect can be enhanced by the number.
Therefore, it is possible to secure a high performance for isolating the acceleration within a range that does not deviate from the high frequency component of the acceleration of the earthquake.

The floor steel frame 20 is a steel frame structure that supports the floor structure 70.
The floor steel frame 20 has a structure in which steel frames are assembled in a cross-beam shape.
The floor steel frame 20 is supported by a plurality of seismic isolation mechanism devices 10 supported by a foundation.

The damper 30 is a device that attenuates vibration energy when the floor steel frame 20 vibrates.
For example, the damper 30 is a hydraulic damper.
A plurality of dampers 30 are provided between the foundation and the floor steel frame 20.

The automatic leveling device 50 is a device that automatically controls the level of the floor steel frame 20.
A plurality of automatic leveling devices 50 may be provided in each of the plurality of seismic isolation device 10.
For example, the automatic leveling device 50 sucks or discharges air to the air spring 100 of the seismic isolation mechanism device 10 so that the height position of the floor steel frame 20 is maintained at a predetermined height.
The automatic leveling device 50 discharges air from the air spring 100 of the seismic isolation mechanism device 10 when the height position of the floor steel frame 20 becomes higher than a predetermined height, and when the height position of the floor steel frame 20 becomes lower than the predetermined height. Air is sucked into the air spring 100 of the seismic isolation device 10 to keep the height of the floor steel frame 20 at a predetermined height.

The floor structure 70 is a structure that forms a floor.
The floor structure 70 is supported by the floor steel frame 20 at a plurality of locations.

Below, the structure of the air spring which comprises the apparatus 10 for seismic isolation mechanisms is explained in full detail.
The air spring 100 is supported by a foundation and supports a supported body, and is composed of one lower fitting 110, one upper fitting 120, and an elastic cylindrical body 130.
The air spring 100 may be composed of one lower metal fitting 110, one upper metal fitting 120, N + 1 elastic cylindrical bodies 130, N intermediate metal fittings 140, and an air chamber 160.

The lower metal fitting 110 is a fixing member.
The lower metal fitting 110 is a plate-like fixing member.
For example, the lower metal fitting 110 is a plate-like metal plate having a ring-shaped protrusion that fits in the opening below the elastic cylindrical body 130 on the upper surface.

The upper metal fitting 120 is a fixing member.
The upper metal fitting 120 is a plate-like fixing member.
For example, the upper metal fitting 120 is a plate-like metal plate having a ring-shaped protrusion that fits into the upper opening of the elastic cylindrical body 130 on the lower surface.

The elastic cylindrical body 130 is an elastic cylindrical member that forms a pair of upper and lower openings and can expand and contract in the vertical direction.
For example, the elastic cylindrical body 130 includes a rubber film 131 and one or a plurality of members 132.
The rubber film 131 is a fiber-reinforced rubber cylindrical member that forms a pair of upper and lower openings.
However, the member 132 is a metal ring-shaped member surrounding the outer periphery of the cylinder of the rubber film 131.
A plurality of chisel members 132 surround the outer periphery of the rubber film 131 with a predetermined interval in the vertical direction.

The intermediate metal fitting 140 is a member.
The intermediate metal fitting 140 is a plate-like member.
For example, the intermediate fitting 140 has an upper surface having a ring-shaped protrusion that fits in the opening below the elastic cylinder 130 on the upper surface, and a protrusion that fits in the opening above the elastic cylinder 130 on the lower surface. It is a plate-shaped metal plate provided with a communication hole O penetrating therethrough.

The lower metal fitting 110 is supported by the foundation and blocks the opening below the lowermost elastic cylinder 130 from the atmosphere.
For example, the lower opening of the lowermost elastic cylinder 130 is fitted into a protrusion provided on the upper surface of the lower metal fitting 110 to be kept airtight.
The upper metal fitting 120 supports the supported body and blocks the opening above the uppermost elastic cylinder 130 from the atmosphere.
For example, the upper opening of the uppermost elastic cylindrical body 130 is fitted into a protrusion provided on the lower surface of the upper metal fitting 120 to be kept airtight.
N intermediate fittings 140 communicate with the lower opening of the elastic cylindrical body 130 in contact with the upper surface and the upper opening of the elastic cylindrical body 130 in contact with the lower surface, respectively, and further shield them from the atmosphere.
For example, the lower opening of the elastic cylindrical body 130 in contact with the upper surface is fitted into a protrusion provided on the upper surface of the intermediate metal fitting 140 to be kept airtight, and the upper opening of the elastic cylindrical body 130 in contact with the lower surface is the lower surface of the intermediate metal fitting 140. The communicating hole O provided in the intermediate metal fitting 140 communicates with the lower opening of the elastic cylindrical body 130 in contact with the upper surface and the upper opening of the elastic cylindrical body 130 in contact with the lower surface. To do.

The air chamber 160 has a room structure having a space communicating with the inside of the elastic cylindrical body 130.
The air chamber 160 is fixed to one of the lower metal fitting 110 or the upper metal fitting 120, communicates with an opening of the elastic cylindrical body 130 in contact with one of the lower metal fitting 110 or the upper metal fitting 120, and is a chamber structure that is cut off from the atmosphere. It is.
The air chamber 160 includes an air chamber member 161 and an air communication port 162.
The air chamber member 161 is a member having a predetermined height and a diameter substantially matching the circumferential diameter of the cylindrical shape of the elastic cylindrical body 130 and having a sealed space inside.
The air communication port 162 is a communication port that connects one end of the communication pipe 300.

The seismic isolation mechanism device according to the embodiment of the present invention and the seismic isolation mechanism using the same have the following effects due to their configurations.
Since the plurality of auxiliary tanks 200 are connected to the air spring 100 that supports the supported body by the plurality of communication pipes 300, the pipe resistance of the whole of the plurality of communication pipes 300 even if the communication pipe 300 having a small diameter is adopted. Therefore, seismic isolation can be achieved by damping due to pipe resistance without extremely increasing the natural frequency of the entire device.
Further, assuming a vibration system that supports mass with the air spring 100, the plurality of auxiliary tanks 200, and the plurality of communication pipes 300, the peak point P of the frequency-amplitude magnification curve in the transfer characteristic graph of the vibration system represents the pipe resistance. Since it is located below the zero frequency-amplitude magnification curve of the zero vibration system assumed to be zero, it can be isolated by damping by pipe resistance without extremely increasing the natural frequency of the entire device.
Further, assuming a vibration system in which the mass is supported by the air spring 100, the plurality of auxiliary tanks 200, and the plurality of communication pipes 300, the transfer characteristic graph of the vibration system in which the total pipe resistance of the plurality of communication pipes 300 is equivalent is shown. Since the peak point P of the frequency-amplitude magnification curve is located below the zero frequency-amplitude magnification curve of the zero vibration system assuming that the pipe resistance is zero, the natural frequency of the entire device should be extremely increased. And can be seismically isolated by damping due to pipe resistance.
Further, since the frequency at the peak point P of the vibration frequency-amplitude magnification curve of the vibration system is substantially equal to the zero frequency which is the frequency at the zero peak point P0, the amplitude magnification is made as small as possible. Seismic isolation can be achieved by damping the piping resistance without drastically increasing the overall natural frequency.
In addition, since the throttle element 320 is not provided in the at least one communication pipe 300 and the throttle element 320 is provided in the at least one connection pipe 300, the air generated by the throttle element without extremely increasing the natural frequency of the entire device. Seismic isolation is possible by attenuation.

Furthermore, the seismic isolation mechanism apparatus which concerns on embodiment of this invention, and the seismic isolation mechanism using the same have the following effects by the structure.
The plurality of auxiliary tanks 200 are connected to the air spring 100 that supports the supported body by the plurality of communication pipes 300, the throttle elements 320 are not provided in the at least one communication pipe 300, and the throttle elements 320 are provided in the at least one connection pipe 300. Since it is provided, it can be isolated by air damping by the throttle element without extremely increasing the natural frequency of the entire device.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention.
Although the air spring 100 has been described as including the air chamber 160, the present invention is not limited to this, and the air chamber 160 may not be included.
Although one end of the communication pipe 300 has been described as being connected to the air communication port 162 of the air chamber 160, the present invention is not limited to this, and one end of the communication pipe 300 is connected to the air communication port 162 provided in the lower metal fitting 110 or the upper metal fitting 120. You may make it connect.

D Error range О Communication hole P Peak point P0 Zero peak point 10 Seismic isolation device 20 Floor steel 30 Damper 50 Automatic leveling device 70 Floor structure 100 Air spring 110 Lower bracket 120 Upper bracket 130 Elastic cylinder 131 Rubber film 132 Baffle member 140 Intermediate Bracket 160 Air Chamber 161 Air Chamber Member 162 Air Communication Port 200 Auxiliary Tank 300 Communication Pipe 310 Pipe 320 Throttle Element

Actually open Hei 07-243475 JP 09-302984 A Actual Kaihei 10-184756 JP 2005-058917 A

Claims (4)

A device for a seismic isolation mechanism that is supported by a foundation and supports a supported body,
An air spring that is supported by a foundation and can support a supported body;
One or more auxiliary tanks that are separated from each other and filled with gas of a predetermined pressure;
A plurality of communication pipes that are separated from each other and communicate with the one or more auxiliary tanks;
With
Assuming a vibration system composed of the air spring, one or more auxiliary tanks, a plurality of communication pipes, and a mass corresponding to a vertical load acting on the air spring, the vibration system is displaced with a specific amplitude. In the transfer characteristic graph in which the horizontal axis representing the transfer characteristics of the vibration system when subjected to forced vibration is the frequency and the vertical axis is the amplitude magnification, the peak point of the frequency-amplitude magnification curve is temporarily a plurality of pipes of the communication pipe It is located below the zero frequency-amplitude magnification curve which is the frequency-amplitude magnification curve of the zero-vibration system, which is the vibration system when the resistance is assumed to be zero.
Equipment for seismic isolation mechanisms characterized by that. When the air spring expands and contracts at a specific amplitude with a specific frequency that is a specific frequency, the plurality of communication pipes each have a plurality of specific pipe resistances that are specific pipe resistances,
Assuming a vibration system composed of the air spring, one or more auxiliary tanks, a plurality of communication pipes, and a mass corresponding to a vertical load acting on the air spring, the vibration system is displaced with a specific amplitude. In the transfer characteristic graph in which the horizontal axis representing the transfer characteristics of the vibration system when subjected to forced vibration is the frequency and the vertical axis is the amplitude magnification, the sum of the pipe resistances of the plurality of communication pipes is the sum of the plurality of specific pipe resistances The peak point of the frequency-amplitude magnification curve is equal to the frequency-amplitude magnification curve of the zero vibration system, which is a vibration system assuming that the pipe resistance of each of the plurality of communication pipes is zero. It came to be located below the zero frequency-amplitude magnification curve,
The device for a seismic isolation mechanism according to claim 1. The frequency at the peak point of the frequency-amplitude magnification curve substantially matches the zero frequency, which is the frequency at the zero peak point which is the peak point of the zero frequency-amplitude magnification curve, within an error range,
The amplitude magnification at the peak point of the frequency-amplitude magnification curve is as small as possible,
The device for a seismic isolation mechanism according to claim 2. A throttle element for increasing the pipe resistance of gas is not provided in at least one of the plurality of communication pipes.
A throttle element for increasing the pipe resistance of gas is provided in at least one other communication pipe among the plurality of communication pipes.
The device for a seismic isolation mechanism according to claim 3.

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