JP3929527B2 - Trigger device for seismic isolation system - Google Patents

Description

[0001]
[Industrial application fields]
The present invention restricts the relative movement of the building in the horizontal direction so that the seismic isolation system does not operate during normal times. The present invention relates to a trigger device that operates effectively.
[0002]
[Prior art]
At present, a seismic isolation device is installed between the building and the ground, and when an earthquake occurs, a seismic isolation device is proposed that reduces the vibration applied to the building and minimizes damage to the building. Building with is built.
[0003]
Most existing seismic isolation devices are used for heavy buildings such as office buildings and apartment buildings where the seismic load exceeds the wind load. In this case, a trigger that prevents vibration during normal times and activates the seismic isolation device only in the event of a large earthquake is not provided, or is only equipped with a trigger that is activated by the horizontal vibration of a large earthquake.
[0004]
[Problems to be solved by the invention]
However, in lightweight buildings such as detached houses, the wind load exceeds the seismic load, so there is a problem that when the seismic isolation device is installed, the seismic isolation device is activated by the wind pressure and the building vibrates easily. On the contrary, it will adversely affect the normal environment. Moreover, the trigger for heavy buildings is difficult to use in the same manner because the seismic load applied to the light buildings is low.
[0005]
In order to solve this problem, a trigger mechanism that senses wind pressure and locks the seismic isolation device in the normal state is also conceivable, but this is not desirable because the structure is complicated and costly including maintenance.
[0006]
Therefore, the purpose of the present invention is to prevent the vibration due to wind pressure by restricting the operation of the seismic isolation device of the building during normal times, and canceling the regulation of the seismic isolation device when a large earthquake occurs, and operating it reliably An object of the present invention is to provide a trigger device for a seismic isolation system that is simple in structure and low in cost.
[0007]
[Means for Solving the Problems]
The present invention is a trigger device for operating a seismic isolation system that absorbs seismic force by sliding a building horizontally with respect to the ground, between a part of the building and a fixed member installed on the ground. A lock member that restricts and releases the relative horizontal movement of the two members by interposing them and connecting them together, a first connection body attached to the lock member, and a second connection attached to the building In general, the locking member is suspended at a predetermined height by the connection of the first connecting body and the second connecting body, and the horizontal movement restriction state is continued. Only when vertical vibration is applied, a downward inertial force is applied to the lock member, and the sum of the downward inertial force and the gravity of the lock member is the first connection body and the second connection body. It exceeds the coupling force and, releasing the consolidated A support member for releasing the restriction by dropping the lock member by Rukoto, to solve the above problems by the trigger device of seismic isolation system consisting.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. This embodiment shows an example in which the trigger device of the seismic isolation system is configured separately from the seismic isolation device. FIG. 1 is an exploded perspective view of the trigger device according to the embodiment, FIG. 2 is a diagram illustrating the operation of the trigger device, FIG. 3 is an explanatory diagram illustrating another configuration example of the lock member of the trigger device, and FIG. FIG. 5 is an explanatory diagram showing an example of the arrangement of the trigger device and the seismic isolation device.
[0010]
As shown in FIG. 1, the trigger device 1 includes a locking protrusion 2 attached to the building A side and an anchor protrusion 3 that is a fixing member installed on the ground G side. These locking projections 2 and anchor projections 3 are cylindrical bodies having the same diameter, and are positioned with their axes aligned, and a cylindrical locking member 4 is fitted on the outside in a sleeve shape so as to straddle both. is doing. The height of the lock member 4 is set to be smaller than the height of the anchor projection 3 so that when the lock member 4 falls on the ground G, the engagement between the locking projection 2 and the anchor projection 3 is surely released. is there.
[0011]
The second connecting body 5b is attached to the upper end of the lock member 4, and the first connecting body 5a is attached to the lower surface of the building A. The support member 5 comprising these connecting bodies 5a and 5b allows the lock member 4 to be fixed from the ground. Suspended to the height of
[0012]
Magnets are attached to the respective contact portions of the first connecting body 5a and the second connecting body 5b, and both are connected. The support member 5 maintains the suspension of the lock member 4. However, when a predetermined vertical force is applied, the connection between the first connection body 5 a and the second connection body 5 b is released. For this reason, the weight of the lock member 4 and the strength of the magnetic force of the magnet are set so that the connection of the support member 5 is released by a predetermined vertical vibration.
[0013]
The operation of the trigger device will be described with reference to FIG. Normally, the lock member 4 is suspended from the building A by the support member 5 as shown in FIG. In this state, the lock member 4 connects the locking projection 2 and the anchor projection 3 to restrict the horizontal movement with respect to the ground G even when a horizontal force is applied to the building A. ing. That is, even if wind pressure is applied to the building A and this is moved in the horizontal direction, the trigger device 1 does not operate, and the lock member 4 connects the locking protrusion 2 and the anchor protrusion 3. Seismic isolation devices (described later) arranged in other parts of the building A are not operated.
[0014]
Next, when a large earthquake occurs, a vertical force is applied to the support member 5, and the sum of the downward inertia force acting on the lock member due to the vertical vibration and the gravity acting on the lock member exceeds the coupling force of the support member 5. In this case, as shown in FIG. 2 (b), the connection of the first connecting body 5 a and the second connecting body 5 b is released, and the lock member 4 falls on the ground G. In such a state, the locking projection 2 is free from the external fitting of the lock member 4 and can move freely with respect to the anchor projection 3, so that the vibration of the building A is allowed and the seismic isolation device is operated.
[0015]
Generally, in a large earthquake that expects a seismic isolation effect, first, vertical vibrations occur. For this reason, the trigger device of the present embodiment releases the lock of the seismic isolation device as described above at the initial stage of the earthquake, and puts the seismic isolation device into an operating state. The building is allowed to move in the horizontal direction in response to the subsequent horizontal shaking, and the seismic force applied to the building is reduced. The trigger device does not have a mechanism that automatically returns to the initial state after the operation from the balance between the occurrence probability of a large earthquake and the device cost. Of course, such a structure can be added additionally. .
[0016]
Various structures are conceivable for the lock member of the trigger device . FIG. 3 shows a configuration example of the lock member of the trigger device. FIG. 5 (a) shows a case where a cylindrical lock member 4 is externally fitted using a locking projection 2 and an anchor projection 3 similar to the above embodiment. Unlike the structures of (b) and (c), which will be described later, the structure does not come into contact with the anchor protrusion 3 even if the locking protrusion 2 moves horizontally. Even if it is desired to increase the allowable range, the size of the device does not relate to the size of the displacement, so that it is not necessary to enlarge the trigger device, and a compact structure can be achieved. In addition, the shape of the latching protrusion 2 and the anchor protrusion 3 is not limited to a cylindrical shape, and various shapes such as a quadrangular prism and a pentagonal prism are conceivable.
[0017]
The trigger mechanism shown in FIG. 3 (b) has a disc-shaped locking member 8 with a hole in the center between a locking ring 6 on the building A side and an anchor projection 7 on the ground G side. The movement of the direction is restricted. On the other hand, FIG. 3C shows a structure in which a locking projection 9 is formed on the building A side and an anchor ring 10 is formed on the ground G side. In both cases of FIGS. 3 (b) and 3 (c), one projection is inserted into the other ring, so that when the trigger device is activated, the horizontal movement of the building A depends on the inner diameter of the ring and the outside of the projection. It is allowed only between spans, so to speak, it has a stopper function of the vibration width.
[0018]
The trigger device of FIG. 3 (d) is provided with a first hole 12 and a second hole 13 on the building A side and the ground G side, respectively, and a core body 14 as a lock member is provided so as to straddle both holes 12 and 13. Inserted. According to this structure, the lock member is not exposed to the outside, and deterioration of the mechanism can be suppressed. Further, in FIG. 6 (e), a locking member 17 is interposed between the locking ring 15 on the building A side and the anchor projection 16 on the ground G side in the same manner as FIG. The lock member 17 includes a disk portion 17b fitted into the locking ring 15 on the building A side and a cylindrical portion 17a fitted onto the anchor projection 16 on the ground G side. Fig. 8 (f) shows the same structure as Fig. 6 (d), using the same locking member 17, with the locking projection 18 on the building A side and the anchor ring 19 on the ground G side. Yes. All of the lock members 4, 8, 14, and 17 are suspended at a predetermined height by a support member (not shown). According to these structures (e) and (f), the anchor protrusion 16 is not fitted into the locking ring body 15, and when the anchor protrusion 16 moves horizontally, a large allowable displacement can be obtained. .
[0019]
FIG. 4 shows another structural example of the support member. FIG. 4A shows the support member of the above-described embodiment, in which magnets are attached to the contact portions of the first connecting body 5a and the second connecting body 5b. Further, the support member 21 shown in FIG. 5B is a support member using a so-called ball catch mechanism, in which a columnar first connecting body 21a is inserted into a cylindrical second connecting body 21b. A ball 21d urged by a spring 21c inside the first connecting body 21a fits into a recess formed on the inner wall of the second connecting body 21b, and the both are connected.
[0020]
The support member 22 shown in FIG. 4 (c) is configured such that the first connecting body 22a having a rod-like tip is held by a second connecting body 22b having a cylindrical body with an open upper end to connect the two. is there. Further, the supporting member 23 in FIG. 4 (d) has two first connecting members 23b each having a rod 23a at the tip and two rollers 23d formed on the tip of the arm 23c, and these two arms 23c. It consists of the 2nd connection body 23f comprised by connecting with the tension | pulling spring 23e between. Then, the upper part of the roller 23a of the first connecting member 23b is sandwiched between the two rollers 23c of the second connecting member 23f, and both the rollers 23c are urged by the tension spring 23e to thereby apply the first connecting member 23b and the second connecting member 23f. Are linked. Further, in the support member 24 in FIG. 5 (e), the first connecting body 24a and the second connecting body 24b are each constituted by a pair of magic tapes.
[0021]
In any of the configurations, the supporting member takes into account the gravity acting on the supporting locking member and the inertial force acting on the locking member due to the vertical vibration at the time of a large earthquake. The force for releasing the engagement is set to a predetermined value. In the event of a major earthquake, the trigger device is surely operated when vertical vibrations are applied, and the trigger device is adjusted so that it does not malfunction due to other vibrations such as vibrations caused by wind pressure or vibrations caused by small and medium earthquakes. In the above embodiment, only one support member is attached, but it goes without saying that the number of attachments and the attachment position can be arbitrarily set.
[0022]
FIG. 5 shows an arrangement example of the trigger device 1 according to the present embodiment. According to the present embodiment, the trigger device 1 is disposed between the seismic isolation devices 26. According to such a structure, the type, number, and position of the trigger device and the seismic isolation device can be freely combined, and optimal arrangement is possible depending on the weight and shape of the building A. Moreover, since the arrangement of the apparatus is dispersed, it is more suitable for a continuous foundation.
[0023]
As described above, when the trigger device of the present embodiment is used, the lock member 4 normally connects the building A and the ground G in the horizontal direction. Therefore, the trigger device is used for vibrations caused by wind pressure or small and medium earthquakes. Since the seismic isolation device does not operate, the building A does not move horizontally, and a comfortable residence can be provided. On the other hand, the force by which the trigger device operates depends exclusively on the sum of the gravity acting on the lock member 4 and the inertial force due to the vertical vibration applied to the lock member 4 and the connecting force of the support member 5. Compared to the method of adjusting the characteristics of the seismic isolation device itself in consideration of the weight, the numerical setting is simple and the seismic isolation design is easy. In particular, the device of this embodiment is advantageous when it is difficult to set the characteristics of the seismic isolation device and the building is a lightweight single-family house.
[0024]
Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, a seismic isolation device 31 with a trigger mechanism is configured by combining a trigger device with a seismic isolation device.
[0025]
As shown in the figure, this seismic isolation device 31 is an LRB (red rubber bearing) in which plate rubber and steel plates are alternately laminated between a leg member 32 fixed to the building A side and a base 33 on the ground G side. ) 36 is interposed. A cylindrical lock member 34 is suspended by a support member 35 so as to straddle the leg member 32, the gantry 33, and the LRB 36, and is externally fitted.
[0026]
Normally, the lock member 34 connects the leg member 32 and the gantry 33 in the horizontal direction, so that the seismic isolation mechanism operates even if the building A is subjected to horizontal force due to wind pressure, etc., or vibrations such as rolls caused by small and medium earthquakes. Although it is not allowed to occur, the support member 35 is released by the vertical vibration in the event of a large earthquake, and the seismic isolation mechanism is activated so that the lock member 34 falls on the ground G and the connection between the leg member 32 and the gantry 33 is released. Can be made.
[0027]
FIG. 7 shows an arrangement example of the seismic isolation device 31 with the trigger mechanism. The seismic isolation devices 31 are arranged between the building A and the ground G at predetermined intervals so as to support the weight of the building A evenly. Compared to the first embodiment in which the trigger device and the seismic isolation device are separate devices (see Fig. 5), the seismic isolation device 31 with a trigger reduces the number of installation points and the number of man-hours required, thus improving the construction efficiency. be able to. Depending on the configuration, the arrangement of the apparatus is concentrated, so that it is more suitable for an independent basis.
[0028]
FIG. 8 shows another configuration example of the second embodiment. The seismic isolation device with a trigger mechanism shown in the same figure (a) and (b) uses a sliding support type FPS (friction pendulum system) for the seismic isolation mechanism.
[0029]
As shown in FIG. 6A, the seismic isolation device 37 with a trigger mechanism includes a movable body 38 having a curved upper surface 38a and a lower surface 38b, a gantry 39 that supports the lower surface 38b of the movable body 38, The sliding member 40 covers the upper surface 38a of the movable body 38 and has a contact surface recessed in a spherical shape to form a sliding surface 40a. The gantry 39 is fixed to the ground G side and the sliding member 40 is fixed to the building A side. When a vibration is applied to the building, the movable body 38 supported by the cradle 39a of the gantry 39 is moved to the sliding surface 40a of the sliding member 40. The structure is designed to damp the seismic load on the building by allowing it to slide and move in the horizontal direction.
[0030]
The gantry 39 includes a pedestal 39 a that receives a movable body 38 and has a spherical upper surface and a disc-shaped base 39 b, and an annular lock member 41 outside the base 39 b and the sliding member 40. Is fitted. The lock member 41 is normally suspended from the building A by the support member 42, and is positioned so as to straddle the facing portion between the base 39b of the gantry 39 and the sliding member 40, and connects both in the horizontal direction. ing.
[0031]
In the seismic isolation device 43 with a trigger mechanism shown in FIG. 5B, the lock member 46 of the trigger device is arranged inside the FPS structure. The gantry 45 of this configuration example has a columnar shape, and an annular disk-like lock member 46 is externally fitted thereto. The locking member 46 is suspended from the sliding member 44 by the support member 47, and is interposed between the standing portion 44a on the periphery of the sliding member 44 and the mount 45 so that the sliding member 44 can move in the horizontal direction. It is regulated.
[0032]
In addition, in each structural example of the said 2nd Example, although the structure of the supporting members 35, 42, and 47 was not explained in full detail, it can select from the various structures (refer FIG. 4) illustrated in the 1st Example. it can.
[0033]
【The invention's effect】
According to the trigger device of the seismic isolation system described above, even if the building is a lightweight single-family house, the seismic isolation system is activated when a horizontal force due to wind pressure or a roll due to a small or medium earthquake is applied. Can be prevented and the building will not move horizontally. In addition, the trigger device operates only when vertical vibrations are applied during a large earthquake of a certain scale or larger, and horizontal movement of the building is allowed by the seismic isolation system. It has the effect of eliminating the need for daily considerations such as the ability to follow the displacement of equipment piping.
[0034]
In particular, when the trigger device is composed of a lock member and a support member that drops the lock member with a predetermined vertical vibration, it is economically superior to the method of controlling the seismic isolation device using a sensor or the like. It can be a structure. In addition, since the structure is simple, construction efficiency can be improved and maintenance and the like are easy to perform.
[0035]
Furthermore, the magnitude of the vertical vibration that the trigger device acts on is determined solely by the sum of the gravity acting on the lock member and the inertial force due to the vertical vibration applied to the lock member and the support member's coupling force. Yes and does not depend on the weight of the building. Therefore, compared to the conventional trigger device, it is possible to easily perform the seismic isolation design of the building in which the seismic isolation system operates.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a trigger device according to a first embodiment.
FIG. 2 is a diagram illustrating the operation of the trigger device of the first embodiment.
FIG. 3 is an explanatory view showing another configuration example of the lock member of the trigger device of the first embodiment.
FIG. 4 is an explanatory view showing a structural example of a support member of the trigger device of the first embodiment.
FIG. 5 is an explanatory view showing an arrangement example of the trigger device and the seismic isolation device of the first embodiment.
FIG. 6 is a side sectional view of a seismic isolation device with a trigger mechanism according to a second embodiment.
FIG. 7 is an explanatory view showing an arrangement example of a seismic isolation device with a trigger mechanism according to a second embodiment.
FIG. 8 is an explanatory view showing another structural example of the seismic isolation device with a trigger mechanism according to the second embodiment.
[Explanation of symbols]
A ... Building G ... Ground 1 ... Trigger device 2 ... Locking protrusion (part of building side)
3 ... Anchor protrusion (fixing member on the ground side)
4, 8, 14, 17 ... lock member 5 ... support member 6 ... locking ring
21, 22, 23, 24 ... support member
31, 37, 43… Seismic isolation device with trigger mechanism
34, 41, 46 ... Lock member
35, 42, 47… support member

Claims (1)

A trigger device for operating a seismic isolation system that absorbs seismic force by sliding a building horizontally relative to the ground,
A lock member that regulates and releases the relative horizontal movement of both by interposing between and connecting between a part of the building and a fixed member installed on the ground,
The first connection body attached to the lock member and the second connection body attached to the building, and the lock member is usually connected to the first connection body and the second connection body by a predetermined connection. Only when a certain level of vertical vibration is applied by suspending it at a height, the downward inertia force is applied to the lock member. A support member for releasing the restriction by dropping the lock member by releasing the connection, the sum of the gravity of the members exceeds the connecting force of the first connecting body and the second connecting body ;
Trigger device for seismic isolation system, characterized by comprising

Images