JP7199995B2 - locking mechanism - Google Patents

Description

The present invention relates to locking mechanisms.

Large-scale buildings (large-scale offices, high-rise apartments, etc.) often have characteristics such as high building height, slender proportions, uniform shape, large façade area, and long natural period. Both factors increase the external wind force acting on the building, and as a result, the influence of the external wind force on the seismic force tends to be relatively large.
In particular, when planning these buildings to have a seismic isolation structure, consideration should be given to preventing displacement of the seismic isolation layer in order to ensure habitability against the typhoons that occur every year (for example, the amount of dampers such as lead plugs should be above a certain level). etc.) is required. On the other hand, the installation of excessive dampers tends to hinder the seismic isolation effect against seismic external forces, and there are many cases where the amount of dampers set for wind habitability is excessive for seismic disturbances.
Therefore, in a seismic isolation structure, there is known a locking mechanism that suppresses the displacement of the seismic isolation layer against the wind external force and allows the displacement of the seismic isolation layer against the seismic external force (for example, Patent Document 1 and 2).

For example, an oil damper provided with such a lock mechanism is configured such that displacement is fixed when locked, and functions as an oil damper when unlocked. The lock mechanism is configured to lock and unlock the damper with a solenoid valve according to the signal of the anemometer or seismometer. Normally, the lock is unlocked, and when the wind speed exceeds a predetermined value, the lock is locked. However, when the seismometer measures an acceleration equal to or greater than a predetermined value, the lock is released. If the wind speed has been locked, the lock is automatically released when the wind speed becomes less than the predetermined value.
It should be noted that such a locking mechanism can also be operated only by signals from either an anemometer or a seismometer.
Also known is a locking mechanism for manually switching between locking and unlocking of a damper, for example, by inserting and removing a pin. In such a lock mechanism, when a strong wind is expected, a pin is manually inserted to lock the damper, and when the strong wind ends, the pin is manually pulled out. If an earthquake occurs while the pin is inserted, the pin breaks and unlocks.

JP 2018-025211 A JP-A-2004-232287

A lock mechanism that switches between locking and unlocking in response to signals from an anemometer or seismometer requires electrical control using a control panel, and therefore has the problem of being complicated in structure and costly to install and maintain.
In addition, a lock mechanism that manually switches between locking and unlocking requires time and effort for manual operations such as insertion and removal of a pin, and may cause human error.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a lock mechanism that has a simple structure and can reduce costs and labor required for installation and maintenance.

In order to achieve the above object, a locking mechanism according to the present invention is provided together with a seismic isolation device on a seismic isolation layer between a lower structure and an upper structure capable of relatively displacing in the horizontal direction. A lock mechanism capable of suppressing horizontal relative displacement with an upper structure, comprising: a laminated rubber bearing provided in the lower structure and vertically spaced apart from the upper structure; and the laminated rubber bearing and the upper structure. a plastically deformable side block provided on either one so as to protrude toward the other; and a side block provided on the other of said laminated rubber bearing and said upper structure so as to protrude toward said one. and a projecting portion horizontally opposed to each other, wherein the side block is configured to contact the projecting portion when the projecting portion comes into contact with the lower structure and the upper structure due to relative displacement in the horizontal direction. When the external force received from the projecting portion is less than a predetermined value, the relative displacement in the horizontal direction between the lower structure and the upper structure is suppressed, and when the external force received from the projecting portion is greater than or equal to the predetermined value, plastic deformation occurs. It is characterized by allowing a horizontal relative displacement between the lower structure and the upper structure.

In the present invention, when the lower structure and the upper structure are relatively displaced in the horizontal direction, the side blocks and the projecting portion come into contact with each other, and the external force received by the side block from the projecting portion is less than a predetermined value. Since displacement in the direction toward the side blocks is suppressed, displacement of the seismic isolation layer (horizontal relative displacement between the lower structure and the upper structure) can be suppressed. In addition, when the lower structure and the upper structure tend to be displaced relative to each other in the horizontal direction, the side blocks and the projecting portions come into contact with each other, and when the external force received by the side blocks from the projecting portions exceeds a predetermined value, the side blocks undergo plastic deformation. As a result, the side block and the projecting portion can be displaced relative to each other in the horizontal direction, so that the displacement of the seismic isolation layer can be allowed to allow the seismic isolation device to function.
By setting this predetermined value to the external force that the side blocks receive from the protruding portion when an external seismic force due to a large earthquake acts, for example, when a large earthquake occurs, the seismic isolation device functions to attenuate the vibration. be able to. In addition, when strong winds with external wind force smaller than the seismic external force due to a large earthquake occur, displacement of the seismic isolation layer is suppressed, so the behavior of the seismic isolation device can be locked.
In the lock mechanism of the present invention, the seismic isolation device can be prevented from functioning during strong winds or minor earthquakes, thereby enhancing the habitability of the seismic isolation structure. The design external force of the body is also reduced, the number of frames can be reduced, and the degree of freedom in planning can be secured.
The lock mechanism of the present invention can have a simple structure using a laminated rubber bearing, a plastically deformable side block, and a projecting portion. It is possible to reduce the cost and time required for

Further, in the lock mechanism according to the present invention, the side block is provided so as to protrude upward from the outer peripheral portion of the upper portion of the laminated rubber bearing, and the protruding portion is arranged above and below the laminated rubber bearing in the upper structure. It may be provided so as to protrude downward from a position facing the direction.
With such a configuration, the lock mechanism can be structurally and cost rationalized.

Further, in the lock mechanism according to the present invention, the side block is provided so as to protrude downward from a position facing the outer peripheral portion of the laminated rubber bearing in the upper structure in the vertical direction, and the protruding portion comprises: It may be provided so as to protrude upward from the upper portion of the laminated rubber bearing.
With such a configuration, the lock mechanism can be structurally and cost rationalized.

Further, in the lock mechanism according to the present invention, a plurality of side blocks may be provided at intervals around the protruding portion.
With this configuration, when the lower structure and the upper structure tend to move relative to each other in the horizontal direction, the side blocks and the projecting portions come into contact with each other, and the external force that the side blocks receive from the projecting portions is less than a predetermined value. In this case, any horizontal relative displacement occurring between the upper structure and the lower structure can be suppressed.

Moreover, in the locking mechanism according to the present invention, the side block may be detachably provided on the laminated rubber bearing.
With such a configuration, the side block can be easily replaced. Therefore, even if the side block is plastically deformed, the lock mechanism can be made to function by replacing the side block.

According to the present invention, the lock mechanism can have a simple structure, and the cost and effort required for installation and maintenance of the lock mechanism can be reduced.

FIG. 3 is a view showing an example of a lock mechanism according to an embodiment of the present invention, and is a vertical cross-sectional view corresponding to the AA line cross-section of FIG. 2; 2 is a horizontal sectional view corresponding to the BB line section of FIG. 1; FIG. It is a perspective view of a side block. It is a figure explaining the behavior of a lock mechanism at the time of an external wind force acting. It is a figure explaining the behavior of a locking mechanism at the time of an earthquake external force acting. FIG. 5 is a vertical cross-sectional view showing an example of a lock mechanism according to a modified example of the embodiment of the invention;

A lock mechanism 1 according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG.
As shown in FIG. 1, the lock mechanism 1 according to this embodiment is provided with a seismic isolation device (not shown) on a seismic isolation layer 13 of a seismic isolation structure. The seismic isolation layer 13 is provided between the lower structure 11 and the upper structure 12 that are relatively displaceable in the horizontal direction. The upper surface 11a of the lower structure 11 and the lower surface 12a of the upper structure 12 are each formed on a horizontal plane and face each other with a gap in the vertical direction.
The lock mechanism 1 prevents displacement of the seismic isolation layer 13 (upper structure 12 and lower structure (horizontal relative displacement with the body 11) is locked, and the lock is released when an external seismic force due to a large earthquake acts.
In this embodiment, a plurality of lock mechanisms 1 are provided on the seismic isolation layer 13 .

In the following description of the lock mechanism 1, it is assumed that the seismic isolation structure is not subjected to wind external force or seismic external force. A large earthquake is defined as a state in which a seismic external force due to a predetermined large earthquake is acting on a seismic isolated structure, and a small earthquake is defined as a state in which a seismic external force smaller than that due to a large earthquake is acting on a seismic isolated structure. The state in which it is acting is defined as the time when external wind force is applied. The external wind force is an external force that is smaller than the seismic external force caused by a large earthquake.

The locking mechanism 1 includes a laminated rubber bearing 2 provided on a lower structure 11, a side block 3 provided to protrude upward from the outer peripheral portion of the laminated rubber bearing 2, and an upper part provided on an upper structure 12. and a projecting portion (projecting portion) 4 .

The laminated rubber bearing 2 is fixed to a lower mounting portion 5 provided on the upper surface 11 a of the lower structure 11 .
The lower mounting portion 5 is a member formed by forming concrete into a flat plate shape, and is provided on the upper surface of the lower structure 11 so that the plate surface is oriented horizontally. The lower mounting portion 5 is fixed to the lower structure 11 so as not to be relatively displaced.
The upper projecting portion 4 is fixed to an upper mounting portion 6 provided on the lower surface 12 a of the upper structure 12 .
The upper attachment portion 6 is a member formed by forming concrete into a flat plate shape, and is provided on the lower surface 12a of the upper structure 12 so that the plate surface is oriented horizontally. The upper mounting portion 6 is fixed to the upper structure 12 so as not to be relatively displaced.
The lower mounting portion 5 and the upper mounting portion 6 face each other with a space therebetween in the vertical direction.

The laminated rubber bearing 2 has a laminated rubber 21 , a lower flange 22 provided below the laminated rubber 21 , and an upper flange 23 provided above the laminated rubber 21 .
The laminated rubber bearing 2 is formed in a columnar shape, and is arranged so that the axis of the column is vertical.
The lower flange 22 and the upper flange 23 are formed in the shape of a flat plate whose plate surface is a circle or a regular octagon larger than the circle of the laminated rubber 21 in a plan view, and are arranged so that the plate surface is horizontal. The lower flange 22 and the upper flange 23 are configured to be relatively displaceable in the horizontal direction within a range in which the laminated rubber 21 can be deformed in the horizontal direction.
In the laminated rubber bearing 2, the lower flange 22 is fixed to the upper surface 5a of the lower mounting portion 5, and the upper flange 23 is arranged below the upper mounting portion 6 with a gap from the lower surface 6a of the upper mounting portion 6. there is The laminated rubber bearing 2 is connected to the lower structure 11 through the lower mounting portion 5 but not connected to the upper structure 12 .

Eight side blocks 3 are annularly arranged at equal intervals in the circumferential direction on the periphery of the upper surface 23 a of the upper flange 23 . Since the upper surface 23a of the upper flange 23 is formed in a regular octagon or a circle enclosing it, the side block 3 is arranged on the upper surface 23a of the upper flange 23 at the center of each side of the regular octagon. The eight side blocks 3 are formed in the same shape as each other, and are arranged radially so as to face the center of the arrangement.
Eight side blocks 3 are provided in series with the laminated rubber bearing 2 respectively.
The side block 3 has a fixing portion 31 fixed to the upper flange 23 and a side block protruding portion 32 protruding upward from the fixing portion 31 .
The fixed portion 31 is formed in a flat plate shape and is fixed to the upper flange 23 so that the plate surface thereof is horizontal.

The side block protruding portion 32 is made of steel such as cast steel that has toughness and is plastically deformable.
As shown in FIG. 3, the side block protruding portion 32 has a surface facing the center of the arrangement of the eight side blocks 3 (inner surface 321) facing outward from the center of the arrangement from the bottom to the top. , and is formed on a curved surface that curves so as to protrude upward.
The side block protruding portion 32 is formed such that the surface facing the outside of the arrangement of the eight side blocks 3 (outside surface 322) is formed to be an inclined surface that extends outward from the center of the arrangement from the lower side to the upper side. there is

The side block projecting portion 32 is positioned on both sides of the upper surface 323 which is a substantially horizontal surface connecting the upper edge of the inner surface 321 and the upper edge of the outer surface 322, and the inner surface 321, the outer surface 322, and the upper surface 323. It has a pair of side surfaces 324,324. The pair of side surfaces 324, 324 are formed in substantially vertical planes arranged parallel to each other.
The side block projecting portion 32 has a tapered shape in which the distance between the inner side surface 321 and the outer side surface 322 decreases from bottom to top.
As shown in FIG. 1, the upper surface 323 of the side block projecting portion 32 is separated from the fixing plate 41 of the upper projecting portion 4, which will be described later. The side block projecting portion 32 is not connected to the upper structure 12 .

The upper projecting portion 4 has a fixing plate 41 fixed to the lower surface 6 a of the upper mounting portion 6 and a projecting plate 42 fixed to the lower surface of the fixing plate 41 and protruding downward from the fixing plate 41 .
The fixing plate 41 is formed in a flat plate shape, and is fixed to the lower surface 6a of the upper mounting portion 6 so that the plate surface faces the horizontal plane. The fixed plate 41 is made of a steel plate or the like.
As shown in FIGS. 1 and 2, the protruding plate 42 is formed in a flat plate shape having a regular octagon that can be arranged inside the side block protruding portions 32 of the eight side blocks 3 in a plan view, and the plate surface is a horizontal plane. It is fixed to the lower surface of the fixing plate 41 in the direction of . In FIG. 2, the projecting plate 42 is indicated by a two-dot chain line.
The projecting plate 42 is made of steel or the like, and collides with the side block projecting portion 32 when the seismic isolation layer is displaced.
The projecting plate 42 is formed to have a planar shape smaller than that of the fixed plate 41 and is arranged inside the fixed plate 41 in plan view. The protruding plate 42 has chamfered corners between the lower surface and the side surfaces, and an inclined surface is formed on the lower side of the entire outer edge. The inclined surface below the outer edge of the projecting plate 42 is defined as an outer edge lower inclined surface 421 .

The projecting plate 42 is arranged inside the eight side blocks 3 above the laminated rubber bearing 2 . The lower surface 42 a of the projecting plate 42 is arranged below the upper surface 323 of the side block projecting portion 32 of the side block 3 . The lower surface 42a of the projecting plate 42 vertically faces the upper surface 23a of the upper flange 23 of the laminated rubber bearing 2 with a gap therebetween.
The outer edge lower inclined surface 421 of the projecting plate 42 is arranged in parallel with the inner surface 321 of the side block projecting portion 32 of each side block 3 with a space therebetween. A horizontal separation distance between the outer edge lower inclined surface 421 of the projecting plate 42 and the inner surface 321 of the side block projecting portion 32 of each side block 3 in the normal state is defined as a horizontal distance L1.
The protruding plate 42 is not connected to the side block 3 and the laminated rubber bearing 2, and is not connected to the lower structure 11 either.

In the lock mechanism 1 of the present embodiment, since the laminated rubber bearing 2 and the side block 3 connected to the lower structure 11 are separated from the upper projecting portion 4 connected to the upper structure 12 at normal times, This configuration does not transmit a load between the upper structure 12 and the lower structure 11 and does not have a load supporting function. Therefore, the lock mechanism 1 does not act on the seismic isolation layer 13 . The vertical distance between the laminated rubber bearing 2 and the side block 3 and the upper protruding portion 4 is set in anticipation of the vertical creep amount of the seismic isolation layer 13 during normal operation. It is determined by taking into account the conditions during the action of an earthquake external force.

Next, behavior of the lock mechanism 1 will be described.
As shown in FIG. 4, when an external wind force acts on the seismic isolation structure and the upper structure 12 and the lower structure 11 are relatively displaced in the horizontal direction, the lock mechanism 1 is moved by the horizontal separation distance L1 (see FIG. 1, A normal horizontal separation distance between the outer edge lower inclined surface 421 of the projecting plate 42 of the upper projecting portion 4 and the inner surface 321 of the side block projecting portion 32 of the side block 3 exhibits seismic isolation behavior.
When the displacement of the seismic isolation layer 13 reaches the horizontal separation distance L1, the outer edge lower inclined surface 421 of the projecting plate 42 of the upper projecting portion 4 and the inner surface 321 of the side block projecting portion 32 of the side block 3 come into contact at the same time, The horizontal relative displacement between the upper structure 12 and the lower structure 11 is constrained, and the behavior of the seismic isolation layer 13 is constrained.

Therefore, from the viewpoint of external wind force, it should be noted that if the horizontal distance L1 between the upper projecting portion 4 and the side block 3 is excessive, the behavior of the seismic isolation layer 13 cannot be restrained. It is necessary to properly set the horizontal separation distance L1 of .
Although the side block 3 is made of steel or the like, it has high initial rigidity, but since it is arranged in series with the laminated rubber bearing 2, which has low horizontal rigidity, it may be affected by an external wind force due to a slight positional irregularity during construction. Phenomena such as stress concentration on a specific one of the plurality of lock mechanisms 1 during operation are avoided.

The rigidity of the laminated rubber bearing 2 is adjusted to a value that allows the behavior of the seismic isolation layer 13 to be restrained in consideration of the above function. Since the side blocks 3 are arranged radially, a single locking mechanism 1 can exhibit a locking function against horizontal external forces in all directions.
Even when a small earthquake of the same level as the wind external force described above occurs and the seismic external force acts, the same behavior as described above is exhibited.

As shown in FIG. 5, when a large earthquake occurs, the seismic external force due to the large earthquake acts on the seismic isolation structure, and the upper structure 12 and the lower structure 11 are relatively displaced in the horizontal direction, the lock mechanism 1 is displaced by the wind. The projecting plate 42 of the upper projecting portion 4 and the side block projecting portion 32 of the side block 3 come into contact with each other in the same manner as in the case of an external force. As a result, the side block protruding portion 32 of the side block 3 is plasticized and bent outward to be permanently deformed. Since the side blocks 3 do not restore once they are plastically deformed, they do not come into contact with the upper projections 4 after that and do not affect the seismic isolation behavior of the seismic isolation layer 13 .

That is, in the event of a large earthquake, the side block 3 and the upper projecting portion 4 can be displaced relative to each other in the horizontal direction because the upper projecting portion 4 abuts against the side block 3 and a predetermined seismic external force acts on the side block 3, causing the side block 3 to become plastic. As a result, the seismic isolation layer 13 exhibits substantially the same behavior as the normal seismic isolation layer 13.
After the earthquake, it is necessary to replace the plasticized side blocks 3, but if the horizontal separation distance L1 between the upper protruding part 4 and the side blocks 3 is properly ensured, replacement becomes difficult due to residual displacement. no.

As described above, various parameters such as the cardinal number of the lock mechanism 1, the strength (shape, material, etc.) of the side block 3, the rigidity of the laminated rubber bearing 2, the horizontal distance L1 between the side block 3 and the upper projecting portion 4, etc. By setting the lock release load (setting of the recurrence period of the wind force that unlocks the lock), characteristics at the time of locking (displacement width of the lock dead zone, rigidity at the time of locking), ease of replacement for residual displacement, etc. It is possible to realize the locking mechanism 1 with a high degree of freedom that is realized as intended.

Next, the operation and effects of the lock mechanism 1 according to the present embodiment described above will be described with reference to the drawings.
In the lock mechanism 1 according to the present embodiment described above, when the lower structure 11 and the upper structure 12 attempt to relatively displace in the horizontal direction, the side blocks 3 and the upper projecting portion 4 come into contact with each other, and the side blocks 3 move toward the upper projecting portion. If the external force received from the base isolation layer 13 is less than a predetermined value, displacement of the seismic isolation layer 13 (horizontal direction between the lower structure 11 and the upper structure 12) is suppressed in order to suppress the displacement of the upper projecting portion 4 in the direction toward the side block 3. relative displacement) can be suppressed.
Further, when the lower structure 11 and the upper structure 12 tend to be displaced relative to each other in the horizontal direction, the side blocks 3 and the upper projecting portion 4 come into contact with each other, and the external force received by the side block 3 from the upper projecting portion 4 is equal to or greater than a predetermined value. Then, the side block 3 is plastically deformed, and the side block 3 and the upper projecting portion 4 can be relatively displaced in the horizontal direction without re-contacting each other. can be made

In this embodiment, the predetermined value is set to the external force that the side blocks 3 receive from the upper projecting portion 4 when an external seismic force due to a large earthquake acts. A device can function to dampen vibrations. Further, when a strong wind acts with a wind external force that is smaller than the seismic external force caused by a large earthquake, displacement of the seismic isolation layer 13 is suppressed, so that the behavior of the seismic isolation device can be locked.
As a result, in the lock mechanism 1, the seismic isolation device functions during a large earthquake and does not function during a strong wind or a minor earthquake, so that the habitability of the seismic isolation structure can be improved. In addition, the design external force of the upper structure 12 is also reduced, and reduction in the number of skeletons and securing of plan flexibility can be realized.
The lock mechanism 1 can have a simple structure using the laminated rubber bearing 2, the plastically deformable side block 3, and the upper projecting portion 4, and does not require electrical control or manual operation, so installation and operation are easy. You can save maintenance costs and time.

The lock mechanism 1 according to the present embodiment is a passive device that is simple, clear, inexpensive, and easy to replace parts even after a large earthquake, and has a high degree of freedom that allows the characteristics to be clearly adjusted according to the designer's intentions. mechanism. Therefore, it is possible to construct a system that is highly reliable both when an external wind force acts and when an earthquake external force acts.
The lock mechanism 1 according to the present embodiment is a compact combination of parts, and the joint details thereof are all configured by existing technology, so it is easy to adopt in terms of construction period, procurement, and workability.

In addition, since a plurality of side blocks 3 are provided at intervals around the entire circumference of the upper projecting portion 4, the lower structure 11 and the upper structure 12 tend to displace relative to each other in the horizontal direction. When the upper projecting portion 4 abuts against the side block 3 and the external force received by the side block 3 from the upper projecting portion 4 is less than a predetermined value, any horizontal relative force generated between the upper structure 12 and the lower structure 11 Displacement can be suppressed with one lock mechanism 1 .

In addition, since the side block 3 is detachably attached to the laminated rubber bearing 2, the side block 3 can be easily replaced. By doing so, the lock mechanism 1 can be made to function.
In particular, by setting the weight of each side block 3 to a value that is small and excellent in portability, replacement of damaged parts can be easily handled.

Although the embodiments of the lock mechanism according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the scope of the invention.
For example, in the above-described embodiment, a plurality of side blocks 3 are provided at intervals around the entire circumference of the upper projecting portion 4, but one side block 3 is provided so as to cover the entire circumference of the upper projecting portion 4. Alternatively, only one side block 3 may be provided on a part of the periphery of the upper projecting portion 4 when suppressing the displacement of the seismic isolation layer 13 only in a specific direction.

In the above embodiment, the side block 3 is detachably attached to the laminated rubber bearing 2, but the fixing of the side block 3 to the laminated rubber bearing 2 may be appropriately set.
Further, in the above embodiment, the laminated rubber bearing 2 is fixed to the lower structure 11 via the lower mounting portion 5, and the upper projecting portion 4 is fixed to the upper structure 12 via the upper mounting portion 6. ing. Alternatively, the laminated rubber bearing 2 may be fixed directly to the lower structure 11 and the upper projection 4 may be directly fixed to the upper structure 12 .
Further, the side blocks 3 and the upper projecting portion 4 may have shapes other than those described above, as long as they are shapes capable of coming into contact with each other when the upper structure 12 and the lower structure 11 are displaced relative to each other.

In the above embodiment, the side block 3 is provided on the laminated rubber bearing 2, and the upper projecting portion 4 is provided on the upper structure 12. However, like the lock mechanism 1B shown in FIG. may be provided on the upper structure 12 and a lower protrusion (protrusion) 43 may be provided on the laminated rubber bearing 2B instead of the upper protrusion 4 .
The side block 3B has the same form as the side block 3 of the above-described embodiment. protrudes to The side block 3B is provided at a position facing the outer peripheral portion of the laminated rubber bearing 2B in the upper mounting portion 6 in the vertical direction.
The lower protruding portion (protruding portion) 43 is a flat plate-like member integrated with the upper flange of the laminated rubber bearing 2B. ing. The inclined surface 431 is configured to contact the side block projecting portion 32B of the side block 3B when the lower structure 11 and the upper structure 12 are displaced relative to each other in the horizontal direction.
A plurality of side blocks 3B are provided at intervals around the entire periphery of the lower projecting portion 43 .

In the lock mechanism 1B, as in the lock mechanism 1 described above, when the lower structure 11 and the upper structure 12 are about to be relatively displaced in the horizontal direction, the side block 3B and the lower projecting portion 43 come into contact with each other, and the side block 3B is displaced. When the external force received from the lower projecting portion 43 is less than a predetermined value, displacement of the seismic isolation layer 13 (between the lower structure 11 and the upper structure 12) is suppressed in order to suppress the displacement of the lower projecting portion 43 in the direction toward the side block 3B. horizontal relative displacement) can be suppressed.
Also, when the lower structure 11 and the upper structure 12 tend to move relative to each other in the horizontal direction, the side blocks 3B and the lower protrusions 43 come into contact with each other, and the external force received by the side blocks 3B from the lower protrusions 43 is equal to or greater than a predetermined value. Then, the side block 3B is plastically deformed, and the side block 3B and the lower projecting portion 43 can be relatively displaced in the horizontal direction without re-contacting each other. can be made

1, 1B lock mechanism 2, 2B laminated rubber bearing 3, 3B side block 4 upper protrusion (protrusion)
11 lower structure 12 upper structure 13 seismic isolation layer 43 lower protrusion (protrusion)

Claims (5)

A lock that is provided on a seismic isolation layer between a lower structure and an upper structure that are capable of relative displacement in the horizontal direction together with a seismic isolation device, and that can suppress relative displacement in the horizontal direction between the lower structure and the upper structure. In the mechanism
a laminated rubber bearing provided in the lower structure and vertically spaced apart from the upper structure;
a plastically deformable side block provided on one of the laminated rubber bearing and the upper structure so as to protrude toward the other;
a projecting portion provided on the other of the laminated rubber bearing and the upper structure so as to project toward the one and facing the side block in the horizontal direction;
The side blocks are configured such that when the lower structure and the upper structure are about to be displaced relative to each other in the horizontal direction and the protrusions come into contact with each other, an external force received from the protrusions is less than a predetermined value. relative displacement between the body and the upper structure in the horizontal direction is suppressed, and when the external force received from the protruding portion is equal to or greater than a predetermined value, plastic deformation occurs and the relative displacement between the lower structure and the upper structure in the horizontal direction is suppressed. A locking mechanism characterized by allowing displacement. The side block is provided so as to protrude upward from an upper peripheral portion of the laminated rubber bearing,
2. The lock mechanism according to claim 1, wherein the projecting portion is provided so as to project downward from a position facing the laminated rubber bearing in the upper structure in the vertical direction. The side block is provided so as to protrude downward from a position facing the outer peripheral portion of the laminated rubber bearing in the upper structure in the vertical direction,
2. A lock mechanism according to claim 1, wherein said protruding portion is provided so as to protrude upward from an upper portion of said laminated rubber bearing. The lock mechanism according to any one of claims 1 to 3, wherein a plurality of said side blocks are provided at intervals around the entire periphery of said projecting portion. 5. The locking mechanism according to claim 1, wherein the side block is detachably attached to the one of the laminated rubber bearing and the upper structure.

Images