JP5269403B2 - Building seismic isolation system with wind sway prevention mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolation system of a building provided with a wind shake preventing mechanism which can prevent resonance damage of the building caused by the shake of a foundation side including the characteristic period band of the building, and can materialize it by a simple system structure. <P>SOLUTION: The base isolation system comprises a second weight 20 detecting the shake of the foundation side including the characteristic period band of the building, and a fixation release preventing mechanism 24 preventing a fixation releasing mechanism 19 from releasing the fixation by the wind shake preventing mechanism 1, by the earthquake detection of a first weight 12, when the second weight 20 detects the shake of the foundation side including the characteristic period band. The second weight 20 has the same characteristic period band as that of the building so that the second weight 20 may be moved only by the resonance with the shake of the foundation side including the characteristic period band to detect the shake of the foundation side including the characteristic period band of the building. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a building seismic isolation system having a wind shaking prevention mechanism.

As a building seismic isolation system used for detached base-isolated houses, a wind sway prevention mechanism prevents the upper structure of the building that is seismically isolated by rolling bearings from being shaken by winds such as typhoons. The foundation and the upper structure are maintained in a fixed state by the wind sway prevention mechanism and kept in a seismic isolation state unless the foundation side shake is detected. Some have been designed so that the seismic isolation state is formed when the foundation shake is detected and the wind sway prevention mechanism is released.
Japanese Patent Laid-Open No. 2004-212357

  By the way, the seismic detection sensor used in the above seismic isolation system also detects the shaking of the foundation side including the natural period band (for example, 3 to 3.5 sec) of the building. However, the fixing by the wind sway prevention mechanism is released and a seismic isolation possible state is formed, which causes a problem that there is no possibility that the building will resonate and shake greatly, causing great damage. is there.

  In view of the problems as described above, the present invention can prevent the occurrence of resonance damage to the building due to the shaking of the foundation side including the natural period band of the building, and can be realized with a simple system configuration. An object of the present invention is to provide a building seismic isolation system equipped with a wind sway prevention mechanism.

The above-mentioned problem is a seismic isolation bearing part that is interposed between the foundation of the building and the upper structural part, and isolates the upper structural part,
A wind sway prevention mechanism that fixes and connects the foundation of the building and the upper structure part so as to be releasable, and prevents the upper structure part from shaking due to the wind by the seismic isolation bearing.
A first earthquake detection sensor that detects shaking on the foundation side;
In the building seismic isolation system equipped with the wind sway prevention mechanism, provided with a fixing release mechanism for releasing the fixing by the wind sway prevention mechanism when the foundation side shake from the first earthquake detection sensor is detected,
A second seismic detection sensor for detecting shaking on the foundation side including the natural period of the building;
When the second earthquake detection sensor detects a foundation-side shaking including a natural period of the building, the fixing release mechanism is prevented from releasing the fixing by the wind shaking prevention mechanism by the earthquake detection of the first earthquake detection sensor. This is solved by a building seismic isolation system provided with a wind sway prevention mechanism, characterized in that a fixed release prevention mechanism is provided (first invention).

  In this system, when the second seismic detection sensor detects a shaking of the foundation side including the natural period band of the building, the fixing release prevention mechanism prevents the fixing release mechanism from releasing the fixation by the wind shaking prevention mechanism. The seismic isolation impossible state is maintained, and the occurrence of the resonance damage of the building due to the shaking of the foundation side including the natural period band of the building can be prevented. Moreover, it can be realized with a simple system configuration using a wind shaking prevention mechanism.

1st invention WHEREIN: The said 1st earthquake detection sensor consists of the 1st weight which moves by the shaking of a foundation side,
The fixing release mechanism comprises a mechanical transmission mechanism that releases the fixing by the wind sway prevention mechanism without electricity in conjunction with the movement of the first weight,
The second seismic detection sensor comprises a second weight that has the same natural period band as the natural period band of the building and moves only by resonating with the vibration of the foundation side including the natural period band,
The fixing release preventing mechanism may comprise a mechanical transmission mechanism that electrically prevents the fixing releasing mechanism from releasing the fixation by the wind sway preventing mechanism in conjunction with the movement of the second weight (second invention). ).

  In this case, even if the foundation is shaken by an earthquake at the time of a power failure, the fixing release mechanism releases the fixation by the wind shaking prevention mechanism, and a seismic isolation state is formed, and the foundation shake due to the earthquake includes the natural period band of the building In the case of shaking, the lock release mechanism prevents the lock release mechanism from releasing the lock by the wind shake prevention mechanism, and the seismic isolation is maintained. It is possible to prevent the occurrence of building resonance damage due to the shaking of the foundation side.

  In addition, the second seismic sensor is a second weight that has the same natural period band as the natural period band of the building and moves only by resonating with the vibration of the foundation side including the natural period band. Since the release of the fixation by the shaking prevention mechanism is prevented, the occurrence of resonance damage to the building can be prevented by a simple detection mechanism.

  Further, in the first invention, the second earthquake detection sensor has a natural period band that is the same as the natural period band of the building, and moves and detects only by resonating with the vibration of the foundation side including the natural period band. It is good to consist of a weight (3rd invention). In this case, the occurrence of resonance damage to the building can be prevented by a simple detection mechanism.

  Since the building seismic isolation system having the wind sway prevention mechanism of the present invention is as described above, it is possible to prevent the occurrence of building resonance damage due to foundation side sway including the natural period band of the building, Moreover, it can be realized with a simple system configuration using a wind shaking prevention mechanism.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  The building seismic isolation system provided with the wind sway prevention mechanism of this embodiment includes a seismic isolation bearing (not shown) interposed between the foundation of the building and the upper structure, and a wind as shown in FIG. A shaking prevention mechanism 1 is provided.

The wind sway prevention mechanism 1 is of a hydraulic cylinder type, and a piston 3 is disposed in the cylinder 2, and one chamber 4 and the other chamber 5 sandwiching the piston 3 are connected to the pipe 6 outside the cylinder 2. And the pipe 6 is provided with an on-off valve 7, oil 8 is placed in the chambers 4, 5 and the pipe 6, and the cylinder 2 is connected to the foundation side of the building, The rod 9 of the piston 3 is of a structure adapted to be connected to the upper structure side of the building,
By being connected to the base side and the upper structure portion, as shown in FIG. 2 (a), when the on-off valve 7 is closed, the one chamber 4 and the other chamber 5 are connected through the pipe 6. The movement is blocked, the relative movement between the cylinder 2 and the piston 3 is blocked, and a state of seismic isolation that prevents wind vibration is formed, and the on-off valve 7 is opened as shown in FIGS. In the state, the oil is allowed to go back and forth between the one chamber 4 and the other chamber 5 through the pipe 6, and the cylinder 2 and the piston 3 can move relative to each other to form a seismic isolation possible state. It is made like that. In the wind sway prevention mechanism 1, 10 is a connecting part to the base side, and 11 is a connecting part to the upper structure part side.

  On the foundation side, as shown in FIG. 1B, a first weight 12 constituting a first earthquake detection sensor that detects shaking of the foundation due to an earthquake is provided. The first weight 12 is attached to the upper end portion of the first rod 13 oriented in the vertical direction, and a receiver 14 is provided at an intermediate portion in the length direction of the first rod 13. The lower end side of the base plate 15 is passed through the horizontal plate portion 15a of the base 15 and the receiver 14 is supported on the horizontal plate portion 15a, and is held upright on the horizontal plate 15a so as to be tiltable. The base 15 is provided attached to the foundation side, specifically, the foundation, between the underfloor soil, or a cylinder of a wind sway prevention mechanism connected to the foundation.

  Also, below the horizontal plate portion 15a, the first seesaw material 16 is pivotally provided on the base 15 so as to be rotatable around the horizontal axis, and the first seesaw material 16 is sandwiched between the pivoting portions 16a. The lower end portion of the first rod 13 is connected to the intermediate portion in the longitudinal direction on the first side, and as shown in FIG. 3 (a), the first weight 12 and the first rod 13 are tilted by the shaking on the base side. When it moves, the one side of the first seesaw material 16 sandwiching the pivoting portion 16a rises, and the other side moves downward.

  As shown in FIG. 1 (b), on the other side of the first seesaw material 16 with the pivoting portion 16a interposed therebetween, the engaging portion 17 that holds the valve element 7a of the on-off valve 7 in the closed position. As shown in FIG. 3 (a), when the first weight 12 and the first rod 13 are tilted and the other side of the first seesaw material 16 sandwiching the pivoting portion 16a is lowered, The engagement between the valve body 7a and the engaging portion 17 is released, the valve body 7a is retracted by the restoring urging force of the spring 18 and the on-off valve 7 is opened. A fixing release mechanism 19 is constituted by a mechanical transmission mechanism that releases the fixation between the upper structure portion and the upper structure portion. In addition, 7a is a flow path in the on-off valve 7.

  In addition, on the foundation side, as shown in FIG. 1 (b), a second weight 20 constituting a second earthquake detection sensor for detecting a shaking on the foundation side including the natural period band of the building is connected to the first weight 12. It is provided on the opposite side of the valve body 7a. The second weight 20 is attached to the upper end portion of the second rod 21 that is directed in the vertical direction, and a receiver 22 is provided in the middle portion of the second rod 21 in the length direction. The lower end side of the base plate 15 is passed through the horizontal plate portion 15a of the base 15, and the support 22 is supported on the horizontal plate portion 15a. By resonating due to the shaking of the foundation side, the horizontal plate portion 16a is held in an upright state so as to move together with the second rod 21.

  Further, below the horizontal plate portion 15a, the base 15 is provided with a second seesaw material 23 pivoted around the horizontal axis, and one longitudinal portion sandwiching the pivoting portion 23a of the second seesaw material 23 is provided. The lower end portion of the second rod 21 is connected to the middle portion of the direction, and as shown in FIG. 3B, the second weight 20 resonates and tilts due to the shaking of the foundation side including the natural period band of the building. When the movement is made, the one side sandwiching the pivoting portion 23a of the second seesaw material 23 rises and the one side sandwiching the pivoting portion 16a of the first seesaw material 16 descends while the other side descends. The fixed release prevention mechanism by the mechanical transmission mechanism that engages with the end portion on the other side and prevents the one side from rising and prevents the fixation by the wind sway prevention mechanism 1 from being released by the release mechanism 19. 24 is configured.

  In the building seismic isolation system having the above-described wind sway prevention mechanism, when the base side shaking that does not include the natural period band of the building is generated due to the earthquake, as shown in FIG. Is not detected, and the first weight 12 detects and moves together with the first rod 13 so that the first seesaw material 16 rotates without being obstructed by the second seesaw material 23, and the engaging portion 17 and the valve body 7a are disengaged, the valve body 7a is retracted, the on-off valve 7 is opened, and the fixing of the foundation of the building and the upper structure by the wind sway prevention mechanism 1 is released, and seismic isolation is possible. As a result, the upper structure is seismically isolated.

  On the other hand, when the foundation side vibration including the natural period band of the building occurs due to the earthquake, the second weight 20 detects and resonates as shown in FIG. Accordingly, the second seesaw material 23 rotates, and the rotation of the first seesaw material 16 due to the tilting of the first weight 12 and the first rod 13 is prevented, and the engagement portion 17 and the valve body 7a The on-off valve 7 remains closed without being disengaged, and the seismic isolation impossible state is maintained, and the occurrence of the resonance damage of the building due to the shaking of the foundation side including the natural period band of the building is prevented.

  In this way, according to the building seismic isolation system having the above-described wind sway prevention mechanism, it is possible to prevent the occurrence of the resonance damage of the building due to the shaking of the foundation side including the natural period band of the building, and This can be realized with a simple system configuration using the shaking prevention mechanism 1.

  In the present embodiment, the seismic isolation possible state due to the tilting motion of the first weight 12 is formed with a shaking greater than a predetermined seismic intensity, such as seismic intensity 5, for example. The blocking mechanism 1 is adapted to maintain the seismic isolation impossible state, and the second weight 20 resonates due to the shaking of the foundation side exceeding the seismic intensity and including the natural period band of the building. The tilting operation prevents the wind shaking prevention mechanism 1 from being unlocked and maintains the seismic isolation impossible state. In addition, by adopting a configuration different from that of the illustrated embodiment, the first weight that is tilted in advance by the swing of the foundation side returns to the upright state by the tilting operation that follows the second weight, thereby preventing seismic isolation. May be maintained.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, as the first and second earthquake detection sensors, weights that move by tilting due to an earthquake are employed, or as the fixing release mechanism 19 and the fixing release prevention mechanism 24, the first and first 2 shows the case where the seesaw materials 16 and 23 are adopted, or the hydraulic cylinder type is adopted as the wind sway prevention mechanism 1, but other earthquake detection sensors, other fixation release mechanisms, and other fixation release prevention mechanisms. Other wind fluctuation prevention mechanisms may be employed.

FIG. 1 (a) is a partial cross-sectional plan view showing a wind sway prevention mechanism in the seismic isolation system of the embodiment, and FIG. It is a cross-sectional front view which shows an on-off valve. FIGS. 1A to 1C are partial cross-sectional plan views showing the operating state of the wind sway prevention mechanism. FIGS. 1A and 1B are cross-sectional front views showing operating states of the first and second earthquake detection sensors, the fixing release mechanism, the fixing release prevention mechanism, and the on-off valve in the system, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Wind shaking prevention mechanism 12 ... 1st weight (1st earthquake detection sensor)
19 ... Fixing release mechanism 20 ... Second weight (second earthquake detection sensor)
24. Unlocking prevention mechanism

Claims (2)

A seismic isolation bearing part interposed between the foundation of the building and the upper structural part to isolate the upper structural part;
A wind sway prevention mechanism that fixes and connects the foundation of the building and the upper structure part so as to be releasable, and prevents the upper structure part from shaking due to the wind by the seismic isolation bearing.
A first earthquake detection sensor that detects shaking on the foundation side;
In the building seismic isolation system equipped with the wind sway prevention mechanism, provided with a fixing release mechanism for releasing the fixing by the wind sway prevention mechanism when the foundation side shake from the first earthquake detection sensor is detected,
A second seismic detection sensor for detecting shaking on the foundation side including the natural period of the building;
When the second earthquake detection sensor detects a foundation-side shaking including a natural period of the building, the fixing release mechanism is prevented from releasing the fixing by the wind shaking prevention mechanism by the earthquake detection of the first earthquake detection sensor. An unblocking prevention mechanism that performs , and
The first earthquake detection sensor comprises a first weight that is moved by shaking on the foundation side,
The fixing release mechanism comprises a mechanical transmission mechanism that releases the fixing by the wind sway prevention mechanism without electricity in conjunction with the movement of the first weight,
The second seismic detection sensor comprises a second weight that has the same natural period band as the natural period band of the building and moves only by resonating with the vibration of the foundation side including the natural period band,
The fixing release prevention mechanism is composed of a mechanical transmission mechanism that electrically prevents the fixing release mechanism from releasing the fixation by the wind sway prevention mechanism in conjunction with the movement of the second weight . Building seismic isolation system equipped with a wind shaking prevention mechanism. A seismic isolation bearing part interposed between the foundation of the building and the upper structural part to isolate the upper structural part;
A wind sway prevention mechanism that fixes and connects the foundation of the building and the upper structure part so as to be releasable, and prevents the upper structure part from shaking due to the wind by the seismic isolation bearing.
A first earthquake detection sensor that detects shaking on the foundation side;
In the building seismic isolation system equipped with the wind sway prevention mechanism, provided with a fixing release mechanism for releasing the fixing by the wind sway prevention mechanism when the foundation side shake from the first earthquake detection sensor is detected,
A second seismic detection sensor for detecting shaking on the foundation side including the natural period of the building;
When the second earthquake detection sensor detects a foundation-side shaking including a natural period of the building, the fixing release mechanism is prevented from releasing the fixing by the wind shaking prevention mechanism by the earthquake detection of the first earthquake detection sensor. An unblocking prevention mechanism that performs , and
The second earthquake detection sensor includes a natural period band that is the same as a natural period band of a building, and is composed of a weight that moves only by resonating with a vibration on the foundation side including the natural period band. Building seismic isolation system with shaking prevention mechanism.

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