JPH102128A - Vibration isolation and wind resistant construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent the vibration of a structure caused by wind force in vibration isolation and wind resistant construction of the structure and, at the same time, to surely obtain the effect of vibration isolation when an earthquake occurs. SOLUTION: The construction of vibration isolation is equipped with a vibration isolation laminated rubber 6 provided between a footing 2 and a building 4 and bearing the building 4 in the horizontal direction in a movable manner. It is also equipped with a displacement stop device 8 for stopping always horizontal displacement of the building 4 to the footing 2 in a normal time, an earthquake detection device 10 for detecting earthquake ground motion and a stop releasing device 12 for releasing the displacement stop device 8 when the earthquake ground detection device 10 detects the earthquake ground motion exceeding a specific value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation and windproof structure for a structure.

[0002]

2. Description of the Related Art In a seismic isolation structure of a structure, a vibration of the structure caused by an earthquake is interposed between a foundation and the structure by interposing a seismic isolation support that supports the structure movably in a horizontal direction. Reduced. Various devices are known as the seismic isolation support, such as a seismic isolation laminated rubber in which rubber and a steel plate are alternately laminated, and a combination of bearings, springs and dampers.

Generally, in this type of seismic isolation structure, the horizontal rigidity of the seismic isolation support is reduced, and the natural period of the vibration system including the structure and the seismic isolation support is made longer than the period of the horizontal vibration of the earthquake. This suppresses the vibration of the structure caused by the earthquake.

[0004] Generally, setting the horizontal rigidity of the seismic isolation support to be low means that the structure is easily displaced in the horizontal direction by wind force. For this reason, when the wind speed increases, the structure may vibrate and give occupants or the like discomfort.

For example, the seismic force acting on a building having a weight of 20 (ton) is 0.2 × 20 = 4 (ton) when the base shear coefficient is 0.2. On the other hand, wind power is calculated by the Building Standards Law: wind pressure = 60 × h ^1/2
From (h: height of the building), when the wind receiving area is 60 (m ² ), it is about 8.8 (ton), which is more than twice the seismic force. Therefore, it is understood that the displacement during the typhoon may be larger than the horizontal displacement of the building during the earthquake.

In the conventional seismic isolation structure, in order to solve the problem caused by the strong wind, a lower hole and an upper hole which are vertically opposed to each other are provided on the foundation and the building, respectively. Stopping bars are manually inserted into the upper and lower holes to fix the foundation and the building in the horizontal direction, thereby preventing the building from swaying in a strong wind.

[0007]

However, in the above-described conventional wind-resistant structure, a person must insert a stop rod each time a strong wind occurs, so that the responsiveness to the occurrence of a strong wind is poor. Further, when the strong wind ends, there is a fear that the stop rod is forgotten to be pulled out from the two holes.

Therefore, it is conceivable that the stop rod is not inserted when the wind speed is lower than a predetermined value, and the stop rod is automatically inserted into the lower hole and the upper hole only when a strong wind is generated. But the building may shake,
It is not possible to completely prevent the building from swaying due to the wind.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a structure capable of reliably preventing a structure from swaying due to wind power and having a seismic isolation effect during an earthquake. The purpose is to provide a seismic isolated windproof structure.

[0010]

The present invention has the following configuration to achieve the above object. That is, the invention of claim 1 provides a seismic isolation structure of a structure including a seismic isolation support interposed between a foundation and a structure to support the structure movably in a horizontal direction. Displacement stop means for constantly stopping the horizontal displacement of the structure at normal times, earthquake detection means for detecting seismic motion, and the displacement stop means when the earthquake detection means detects a seismic motion of a predetermined value or more. A seismic isolation windproof structure for a structure, comprising: a stop releasing means for releasing.

According to a second aspect of the present invention, the stop release means includes:
2. The seismic isolation wind-resistant structure according to claim 1, wherein when the earthquake detecting means detects a seismic motion equal to or more than a predetermined value, the seismic motion is maintained until the end of the earthquake.

[0012] The displacement stopping means may be inserted into both the lower hole and the upper hole, which are provided on the foundation and the structure, and which are vertically opposed to each other, and both the lower hole and the upper hole. And a stop member for stopping the horizontal displacement of the structure with respect to the foundation.

The stop member is made of a ferromagnetic material, and the stop release means includes a solenoid arranged substantially coaxially with the central axes of the lower hole and the upper hole. The displacement member may be released by removing the stop member from the lower hole and the upper hole by the solenoid.

The stop releasing means includes a plunger type solenoid disposed substantially coaxially with a center axis of the lower hole and the upper hole, and the stop member includes a plunger of the plunger type solenoid. The displacement stopping means may be released by being attached to a tip end portion and disengaging the stop member from the lower hole portion and the upper hole portion by the plunger type solenoid.

It is desirable that the solenoid is disposed below a structure. In the lower hole and the upper hole, the inner diameter of the hole on the front side of the stop member may be set to be sufficiently larger than the outer diameter of the stop member. The tip of the stop member or the hole may be formed in a tapered shape. Further, the solenoid may be attached via an elastic body.

Further, the earthquake detecting means can be selected from a piezoelectric type seismic device, a servo type seismic device, or a device for detecting an earthquake by the free vibration of a pendulum or a spring.

According to the present invention, the displacement stopping means always stops the horizontal displacement of the structure with respect to the foundation in a normal state, so that even when the wind speed is low, the structure is shaken by the wind force. Is reliably prevented. Therefore, for example, when the structure is a building, a comfortable living environment can be provided to a resident or the like. In addition, when an earthquake motion equal to or more than a predetermined value occurs, the displacement stopping means is released by the stop releasing means, so that the structure can be displaced in the horizontal direction, and a seismic isolation effect can be reliably obtained during an earthquake.

Further, since the displacement stopping means is released in the event of an earthquake, the structure can be displaced in the horizontal direction even in the case of an ordinary earthquake and also when an earthquake and a strong wind occur simultaneously, giving priority to seismic isolation. Seismic isolation effect can be reliably obtained.

Further, if the stop member is attached to the tip of the plunger of the plunger type solenoid,
Since the existing plunger type solenoid can be used with a minimum change, the displacement stopping means and the stop releasing means can be configured at low cost.

Further, if the solenoid is disposed below the structure, it is possible to prevent the solenoid from being exposed to rain, thereby improving the corrosion resistance of the stop release means.

The inner diameter of the lower hole and the upper hole on the front side of the stop member may be set sufficiently large, or the tip of the stop member or the hole may be formed in a tapered shape. By doing so, it is possible to smoothly insert the stop member into the hole.

If the solenoid is mounted via an elastic body, a shear force is applied to the stop member from the lower hole and the upper hole in a strong wind or the like, and the stop member is tilted, so that an external force is applied to the inside of the solenoid. However, since the external force is absorbed by the elastic body, it is possible to prevent the solenoid from being damaged.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, the present invention is applied to the seismic isolation structure having the seismic isolation laminated rubber. However, the present invention is not limited to the application to the seismic isolation structure using the seismic isolation laminated rubber. Widely applicable to other seismic isolation structures such as those using a combination of bearings, springs and dampers, rolling bearings, sliding bearings or composite bearings with these and seismic isolation laminated rubber It is.

FIG. 1 is a side view schematically showing the seismic isolation and windproof structure of the present embodiment, showing a normal state. FIG.
FIG. 2 is a side view schematically showing the seismic isolation wind-resistant structure, showing a state when an earthquake occurs.

As shown in FIG. 1, the seismic isolation structure of this embodiment supports the building 4 so as to be movable in the horizontal direction by being interposed between the foundation 2 and the building (an example of the structure) 4. Seismic isolation laminated rubber (an example of a seismic isolation support) 6
, A displacement stopping means 8 for constantly stopping the horizontal displacement of the building 4 in normal times, a seismic detecting means 10 for detecting seismic motion, and a displacement stopping when the seismic detecting means 10 detects a seismic motion of a predetermined value or more. A stop releasing means for releasing the means.

The seismic isolation laminated rubber 6 is disposed, for example, at each of the four corners on the bottom of the building 4 and is formed by alternately laminating an elastic layer 6a made of rubber or the like and a rigid plate layer 6b made of a steel plate or the like. Things. Also, an upper flange 6c and a lower flange 6d fixed to the bottom surface of the building 4 and the foundation 2, respectively, at the upper and lower ends of the seismic isolation laminated rubber 6, respectively.
Is provided.

The earthquake detecting means 10 comprises a piezoelectric type seismic sensor, a servo type seismic sensor, or a means for detecting an earthquake by the free vibration of a pendulum or a spring.

The displacement stopping means 8 includes the foundation 2 and the building 4
Lower hole portions 1 provided on each of the upper and lower sides facing each other
4a and the upper hole 16a, and the building 4 with respect to the foundation 2 through both the lower hole 14a and the upper hole 16a.
And a stop bar (an example of a stop member) 18 for stopping the horizontal displacement of the stop rod.

In this embodiment, the lower hole 14a is a through hole provided in the lower horizontal plate 14 provided on the foundation 2 and penetrating in the vertical direction. The upper hole 16a is formed by the lower horizontal plate 14a.
The through hole is provided in the upper horizontal plate 16 protruding from the side surface of the building 4 so as to face the building.

The stop rod 18 is made of a ferromagnetic material, and is connected to the lower hole 14a and the upper hole 16a by a solenoid 20 arranged substantially coaxially with the central axis of the lower hole 14a and the upper hole 16a. Functions as a plunger to be inserted and removed. The stop rod 18 is supported on the foundation 2 via a compression spring 22, and is in a normal state (a state of seismic motion less than a predetermined value).
, The lower hole 14a and the upper hole 16a are always inserted.

The solenoid 20 is disposed below the lower horizontal plate 14, and when the earthquake detecting means 10 detects a ground motion of a predetermined value or more (for example, when the first transmitted P wave is detected). The switch 24 is controlled to be turned on by a signal from the earthquake detecting means 10, and the stop rod 18 is attracted by the magnetic force to be lowered downward against the spring force of the compression spring 22. Further, once the switch 24 is turned on, control is performed so that the ON state of the switch 24 is maintained until the end of the earthquake. Also, even when an earthquake and a strong wind occur simultaneously, a signal is received from the earthquake detecting means 10 for detecting an earthquake, the switch 24 is turned on, and the stop rod 18 is disengaged from the lower hole 14a and the upper hole 16a. Controlled. The solenoid 20 is an AC solenoid, a DC
Any of solenoids may be used.

The operation of the embodiment having the above configuration will be described. First, when the seismic motion is less than a predetermined value, the switch 24 is turned off and the solenoid 20 is turned off.
, No current flows, and the stop rod 18 is inserted into both the upper hole 16a and the lower hole 14a. In this state, when a seismic motion equal to or more than a predetermined value occurs and the seismic motion is detected by the seismic detecting means 10, the switch 24 is turned on, and a current flows through the solenoid 20. As a result, due to the magnetic force received from the solenoid 20, the stop rod 18 moves downward as shown in FIG. 2 against the spring force of the compression spring 22, and becomes lower than the upper surface of the lower horizontal plate 14. The ON state of the switch 24 is set so as to be maintained until the end of the earthquake, so that the stop rod 18 is located below the upper surface of the lower horizontal plate 14 until the earthquake is completely stopped. 2 allows a horizontal displacement of the building 4 with respect to 2.

When the state without the seismic motion continues for a sufficiently long time, the switch 24 is controlled to be turned off, and the solenoid 2 is turned off.
The current to zero is shut off. Then, the stop rod 18 is pushed upward by the restoring force of the compression spring 22, and the lower hole 1
It is inserted into both the upper hole 4a and the upper hole 16a to return to a normal state. Thereby, the displacement of the building 4 in the horizontal direction is stopped, and the building 4 enters a normal state in which the building 4 is prevented from shaking due to wind power.

According to the present embodiment acting as described above,
Since the stop bar 18 always stops the horizontal displacement of the building 4 with respect to the foundation 2 at normal times, the shaking of the building 4 due to the wind force is reliably prevented even when the wind speed is low. Therefore, a comfortable living environment can be provided to the resident and the like. In addition, when an earthquake motion equal to or more than a predetermined value occurs, the displacement stop means 8 is released by the energization of the solenoid 20 (the stop rod 18 is detached).
The building 4 can be displaced in the horizontal direction, so that a seismic isolation effect can be reliably obtained during an earthquake.

Further, since the displacement stopping means 8 is released in the event of an earthquake, the building 4 can be displaced in the horizontal direction even in the case of an ordinary earthquake and also when an earthquake and a strong wind occur simultaneously. As a result, the seismic isolation effect can be reliably obtained.

This embodiment is a preferred embodiment of the present invention, and the technical scope of the present invention is not limited to this embodiment. For example, as in a modification of the embodiment shown in FIGS. 3 and 4, in the basic configuration of the embodiment, the stop rod 18 suspended from the support plate 26 via the compression spring 22 is provided near the upper side of the upper horizontal plate 16. The stop rod 18 is installed, and the solenoid 2 is placed above the lower hole 14a and the upper hole 16a.
You may make it repel by 0. The operation and effect of this modified example are the same as those of the above-described embodiment, and a description thereof will be omitted.

Further, as in the modification shown in FIG. 5, the displacement stopping means 8 and the stop releasing means 12 can be arranged below the building 4 (between the bottom surface of the building 4 and the foundation 2). .
In this modification, the stop rod 18 is provided at the tip of the plunger 28a of the plunger type solenoid 28.

The plunger type solenoid 28 is a well-known solenoid such as a push type tubular solenoid or a push / pull type solenoid having a built-in round bar-shaped plunger 28a which operates up and down, as shown in FIG. The flange portion 28b on the outer periphery of the upper end is the lower support plate 1
4 is fastened by bolts 32 via rubber washers (an example of an elastic body) 30. As shown in FIG. 5, the stop rod 18 has a cylindrical portion 18a at its lower portion which fits around the upper end of the plunger 28a, and operates integrally with the plunger 28a. It is inserted into and removed from the portion 14a and the upper hole 16a.

According to the modification shown in FIG. 5, the tip of the plunger 28a of the existing plunger type solenoid 28 only needs to be inserted into the cylindrical portion 18a of the stop rod 18, so that the existing plunger type solenoid 28 is minimized. Therefore, a remarkable effect is obtained that the displacement stopping means 8 and the stop releasing means 12 can be configured at low cost. The solenoid 28 is connected to the building 4
Since the solenoid 28 is disposed below the solenoid, it is possible to prevent the solenoid 28 from being exposed to rain, so that the corrosion resistance of the displacement stopping means 8 and the stop releasing means 12 can be improved. Further, since the solenoid 28 is mounted via the rubber washer 30, as shown in FIG.
In addition, even if a stop force is applied to the stop rod 18 from the upper hole 16a and the stop rod 18 is tilted, and thus an external force is applied to the inside of the solenoid 28, the external force can be absorbed by the rubber washer 30 and damage to the solenoid 28 can be prevented. Can be prevented.

Further, as shown in FIG.
If the inner diameter D1 of the upper hole 16a, which is the forward side of the stop rod 18 of the upper hole 16a and the upper hole 16a, is set to be sufficiently larger than the outer diameter D2 of the stop rod 18, the building can be constructed when a strong wind occurs. Even if the center of the upper hole 16a is slightly displaced from the center of the stop rod 18 due to the horizontal displacement of 4, the stop rod 18 can be smoothly inserted into the upper hole 16a. Similarly, the stop rod 18 can be smoothly inserted by forming the distal end portion 18b of the stop rod 18 into a tapered shape or by forming the upper hole 16a into a tapered shape as shown in FIG. be able to.

[0041]

As described above, according to the present invention, it is possible to reliably prevent a structure from swaying due to wind force and to obtain a seismic isolation effect during an earthquake.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a seismic isolation and windproof structure of the present embodiment, showing a normal state.

FIG. 2 is a side view schematically showing the seismic isolation wind-resistant structure of the present embodiment, showing a state in a strong wind.

FIG. 3 is a side view schematically showing a seismic isolation wind-resistant structure according to a modification of the present embodiment, showing a normal state.

FIG. 4 is a side view schematically showing a seismic isolation wind-resistant structure according to a modified example of the embodiment, and is a diagram showing a state at the time of strong wind.

FIG. 5 is a side view schematically showing a displacement stopping unit according to a modification of the embodiment, and is a diagram showing a normal state.

FIG. 6 is an enlarged view of a portion A in FIG.

FIG. 7 is a side view showing a peripheral structure of a stop rod according to a modified example of the embodiment, and is a view showing a state in which the stop rod is inclined during strong wind.

FIG. 8 is a side view showing a peripheral structure of a lower hole and an upper hole according to a modification of the embodiment.

FIG. 9 is a side view showing a peripheral structure of a stop rod according to a modification of the embodiment.

[Explanation of symbols]

 2 Foundation 4 Building (example of structure) 6 Seismic isolation laminated rubber (example of seismic isolation support) 8 Displacement stop means 10 Earthquake detection means 12 Stop release means 14a Lower hole 16a Upper hole 18 Stop rod (stop) Example of member) 18a Tip 20 Solenoid 28 Plunger type solenoid 28a Plunger 30 Rubber washer D1 Inner diameter of upper hole D2 Outer diameter of stop rod

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[Procedure amendment]

[Submission date] February 19, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

Further, the stop releasing means, the lower hole portion and comprising a central shaft and a solenoid disposed substantially coaxially of the upper hole portion, from the lower hole and the upper hole portion by the solenoid The stop member may be detached to release the displacement stop means.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0030

[Correction method] Change

[Correction contents]

The stop bars 18 may function as a plunger to be inserted into and removed from the lower hole portion 14a and the upward hole 16a by the lower hole portion 14a and the upward hole 16a central axis and a solenoid 20 disposed substantially coaxially of the I do. The stop rod 18 is supported on the foundation 2 via a compression spring 22, and is normally inserted through the lower hole 14a and the upper hole 16a in a normal state (a state of seismic motion less than a predetermined value).

Claims (2)

[Claims] 1. A seismic isolation structure for a structure having a seismic isolation support interposed between a foundation and a structure to support the structure movably in a horizontal direction, wherein the structure is attached to the foundation with respect to the foundation. Displacement stop means for constantly stopping horizontal displacement during normal times, earthquake detection means for detecting seismic motion, and stop release for releasing the displacement stop means when the earthquake detection means detects a seismic motion of a predetermined value or more. And a means for seismic isolation of the structure. 2. The structure according to claim 1, wherein when the earthquake detecting means detects a seismic motion of a predetermined value or more, the stop releasing means is kept in an operating state until the end of the earthquake. Seismic wind resistant structure.