JP2012002246A - Seismic isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively and effectively obtain seismic effects in a seismic isolator.SOLUTION: Seismic effects are exhibited by a lower housing 120 and a slider relatively moving right and left when earthquake motion is at a predetermined magnitude or less. An upper housing 140 and the slider do not relatively move in this case. When the earthquake motion is larger than the predetermined magnitude, the upper housing 140 relatively moves right and left with respect to the slider in addition to the relative movement of the lower housing 120 and the slider, thereby exhibiting the seismic effects. Therefore, the seismic isolator 100 of the embodiment can support a wide range of scales of the earthquake motion.

Description

  The present invention relates to a seismic isolation device.

  2. Description of the Related Art A sliding seismic isolation device is known in which a sliding bearing is provided between a foundation and a building constructed on the foundation to obtain a seismic isolation effect.

  A sliding seismic isolation device is generally composed of a sliding plate fixed to a foundation and a sliding material fixed to the bottom of a building. And at the time of an earthquake, a sliding part slides on a sliding board, and a building part moves horizontally. Thereby, the horizontal force transmitted from the foundation part to the building part is reduced, the period of the building part is lengthened, and the seismic force generated in the building part is suppressed.

  In Patent Document 1, in a sliding-type seismic isolation bearing composed of a sliding surface in contact with a slider, it is composed of a plurality of sliding surface materials divided into three or more regions from the center toward the peripheral edge in the horizontal direction. By setting the friction coefficient of the second region, which is the second from the center, to be the lowest, while providing a high seismic isolation effect (response acceleration reduction effect) for the target seismic motion, the seismic motion is stronger than expected. In contrast, a seismic isolation device that can ensure safety is proposed (see Patent Document 1).

  In addition, Earthquake Protection Systems, Inc. (EPS) arranges two sliders with concave surfaces made up of curved surfaces between sliding surfaces that are made up of curved surfaces, with a pendulum placed between them. However, a sliding seismic isolation device having a four-stage stopper function from the center toward the peripheral edge has been proposed (see Non-Patent Document 1).

JP-A-2005-249103

[Search May 7, 2010], Internet <URL: http://www.earthquakeprotection.com/triple_vs_single_pendulum.html>

Here, a seismic isolation device that can effectively obtain a seismic isolation effect at low cost is desired.
An object of the present invention is to obtain a seismic isolation effect effectively at a low cost.

  According to the first aspect of the present invention, there is provided a lower housing provided on the lower structural portion, an upper housing disposed on the lower housing and provided below the upper structural portion, and an upper surface of the lower housing. A lower inclined surface portion having an inclined surface that is inclined upward from one side in the horizontal direction toward the other side and an inclined surface that is inclined upward from the other side in the horizontal direction to the one side, and the upper side An upper inclined surface portion formed on the lower surface of the housing and having an inclined surface that is inclined upward from one side in the horizontal direction to the other side and an inclined surface that is inclined upward from the other side in the horizontal direction to the one side And the upper housing is disposed between the lower housing and the upper housing and is in contact with an inclined surface of the lower inclined surface portion of the lower housing and an inclined surface of the upper inclined surface portion of the upper housing. Supports the load of the structure, and moves along the inclined surface of the lower inclined surface portion and the inclined surface of the upper inclined surface portion, thereby moving relative to the lower housing and the upper housing in the left-right direction. A slider configured to be able to move, and a resistance force that the slider relatively moves in the left-right direction along the inclined surface of the lower inclined surface portion of the lower housing, and the upper inclined surface portion of the upper housing. It is set so that the resistance force that the slider relatively moves in the left-right direction along the inclined surface is different.

  Therefore, the slider moves in the left and right direction relative to the lower inclined housing and the upper housing, and provides a seismic isolation effect. Effectively demonstrates the seismic isolation effect. Then, it is easier to form the inclined surface than to form a curved surface, for example. Therefore, the seismic isolation effect can be obtained effectively at low cost.

  According to a second aspect of the present invention, there is provided compression force applying means for applying a compression force in a direction in which the lower housing and the upper housing are brought close to each other.

  Therefore, the resistance force that the slider relatively moves in the left-right direction along the lower inclined surface portion of the lower housing and the upper inclined surface portion of the upper housing is increased, and as a result, the energy absorption effect is increased.

  According to a third aspect of the present invention, the lower inclined surface portion of the lower housing and the side inclined surface portion of the upper housing are inclined surfaces that are inclined upward from one horizontal side to the other side and the other horizontal side. There are two or more inclined surfaces that are inclined upward from one side to the other.

  Therefore, even when the slider, the lower housing, and the upper housing are relatively moved, the slider contacts the lower housing and the upper housing at two or more inclined surfaces. Therefore, even if the slider, the lower housing, and the upper housing are relatively moved, a force that tilts the upper housing is not generated.

  According to a fourth aspect of the present invention, the lower inclined surface portion and the upper inclined surface portion are configured so that the upper surface of the lower housing and the lower surface of the upper housing have the same shape.

  Therefore, since the upper surface of the lower housing and the lower surface of the upper housing have the same shape, for example, the upper surface of the lower housing and the lower surface of the upper housing can be molded with the same mold. Therefore, the lower housing and the upper housing can be manufactured at a lower cost than a configuration in which the shape of the upper surface of the lower housing and the shape of the lower surface of the upper housing are different.

  According to the present invention, the seismic isolation effect can be effectively obtained at low cost as compared with a structure not having this configuration.

It is a vertical sectional view (vertical sectional view along line 1-1 of Drawing 2 (C)) which passes along the circle center which shows a seismic isolation device concerning a first embodiment of the present invention. (A) is a front view of the slider which comprises the seismic isolation apparatus which concerns on 1st embodiment of this invention, (B) is a perspective view of a slider, (C) is a perspective view of a lower housing. (A) is sectional drawing corresponding to FIG. 1 which shows the seismic isolation apparatus which concerns on 1st embodiment of this invention, (B) is sectional drawing which shows the state which the lower housing and the slider moved relatively to the left-right direction (C) is a cross-sectional view showing a state in which the upper housing is moved relative to the slider in the left-right direction in addition to the relative movement between the lower housing and the slider. It is a vertical sectional view which passes along the circle center which shows the seismic isolation apparatus which concerns on 2nd embodiment of this invention. It is a vertical sectional view which passes along the circle center which shows the seismic isolation apparatus which concerns on 3rd embodiment of this invention. (A) is a front view of the slider which comprises the seismic isolation apparatus which concerns on 4th embodiment of this invention, (B) is a perspective view of a slider, (C) is a perspective view of a lower housing. It is a vertical sectional view which passes along the circle center which shows the seismic isolation apparatus of the modification of 3rd embodiment of this invention. (A) is a vertical sectional view showing a seismic isolation device according to a fourth embodiment of the present invention, (B) is a sectional view showing a state in which the lower housing and the slider are relatively moved in the left-right direction, C) In addition to the relative movement of the lower housing and slider, the upper housing (A) is a vertical sectional view showing the seismic isolation device according to the fifth embodiment of the present invention, (B) is a sectional view showing a state in which the lower housing and the slider are relatively moved in the left-right direction, C) In addition to the relative movement of the lower housing and slider, the upper housing It is a vertical sectional view which shows the variation of the seismic isolation apparatus which concerns on embodiment of this invention. It is a graph which shows the relationship between the angle ((alpha)) of a inclined surface (slip interface), a friction coefficient ((micro | micron | mu)), a horizontal force (H), and an axial force (G).

<First embodiment>
The seismic isolation apparatus which concerns on 1st embodiment of this invention is demonstrated using FIGS. 1-3. The arrow Z direction indicates the vertical direction, and the case of viewing from the Z direction is a plan view. Furthermore, the case where it sees from the direction orthogonal to a Z direction is set as front view. Further, the arrow R direction in FIG. 1 is the right direction and is one side in the horizontal direction, and the arrow L direction in FIG. 1 is the left direction and is the other side in the horizontal direction. In addition, the PC steel bar 50 shown by the imaginary line of FIG. 1 is used for the description in the third embodiment.

  As shown in FIG. 1, the structure 10 includes a lower structure portion 12 and an upper structure portion 14 constructed on the lower structure portion 12. In the present embodiment, the lower structure 12 is a foundation constructed on the ground dug from the ground surface, and the upper structure 14 is a building constructed on the foundation. And the seismic isolation apparatus 100 of this embodiment is provided between the lower structure part 12 and the upper structure part 14. FIG. That is, in this embodiment, the structure 10 is a seismic isolation structure constructed with a basic seismic isolation structure.

  As shown in FIG. 1 and FIG. 2, the seismic isolation device 100 includes a lower housing 120 provided on the lower structure portion 12 and a lower housing 120 provided below the upper structure portion 14. An upper housing 140. A slider 180 is sandwiched between the lower housing 120 and the upper housing 140. In the present embodiment, as shown in FIG. 2, the lower housing 120 and the slider 180 have a predetermined thickness in the vertical direction and have a circular shape in plan view. Although not shown, the upper housing 140 also has a predetermined thickness in the vertical direction and has a circular shape in plan view. Note that circular plate-like flange portions 122 and 142 having larger diameters than the lower housing 120 and the upper housing are provided on the lower surface of the lower housing 120 and the upper surface of the upper housing 140, respectively.

  In the present embodiment, as shown in FIG. 1, both end portions in the left-right direction of the lower housing 120 and the upper housing 140 are substantially U-shaped with the inner side (center side) in the left-right direction being the opening side. It is connected with a U-shaped steel damper 110.

  As shown in FIGS. 1 and 2C, the upper surface 120A of the lower housing 120 has a concave shape that is recessed downward. Further, as shown in FIG. 1, the lower surface 140A of the upper housing 140 has a concave shape that is recessed upward (a shape that is upside down from FIG. 2C).

  As shown in FIG. 1, the concave portion of the upper surface 120A of the lower housing 120 is inclined such that a predetermined vertical cross section is an upward slope from one horizontal side (arrow R direction) to the other side (arrow L direction). A lower inclined surface portion 130 having surfaces 132A and 132B and inclined surfaces 134A and 134B that are inclined upward from the other horizontal side (arrow L direction) to one side (arrow R direction) is formed. The inclined surfaces 132A and 132B and the inclined surfaces 134A and 134B have the same angle (gradient) with respect to the horizontal.

  As shown in FIG. 1, the concave portion of the lower surface 140 </ b> A of the upper housing 140 has an inclined surface in which a predetermined vertical section is inclined upward from one horizontal side (arrow L direction) to the other side (arrow R direction). An upper inclined surface portion 150 having 152A and 152B and inclined surfaces 154A and 154B that are inclined upward from the other horizontal side (arrow R direction) to one side (arrow L direction) is formed. The inclined surfaces 152A and 152B and the inclined surfaces 154A and 154B have the same angle (gradient) with respect to the horizontal.

  Thus, the shape of the vertical cross section of the lower inclined surface portion 130 of the lower housing 120 is W-shaped, and the shape of the vertical cross section of the upper inclined surface portion 150 of the upper housing 140 is M-shaped.

In the present embodiment, the angles of the inclined surfaces 152 and 154 of the upper housing 140 are larger than the angles of the inclined surfaces 132 and 134 of the lower housing 120.
The “angle” here refers to the inclination angle of the upward gradient of each inclined surface with respect to the horizontal. Alternatively, it means an acute angle of each inclined surface with respect to the horizontal. For example, the inclined surface 132 and the inclined surface 134 have the same angle although the directions of the upward gradient are different.

  Here, the lower housing 120 and the upper housing 140 are circular in plan view with a thickness in the vertical direction. In the present embodiment, the predetermined vertical section is a vertical section passing through the center of the circle. In the present embodiment, all of the predetermined vertical sections passing through the center of the circle have the same shape.

The inclined surfaces 132 and 134 of the lower inclined surface portion 130 and the inclined surfaces 152 and 154 of the upper inclined surface portion 150 are straight or substantially straight in the vertical cross section shown in FIG. 1, but are circular in the horizontal cross section.
Therefore, as shown in FIG. 2C, the inclined surface 134A and the inclined surface 132B arranged on the outer side in the left-right direction constitute one inclined surface 135, and the inclined surface 132A and the inclined surface 134B arranged on the inner side in the left-right direction. Constitutes one inclined surface 133.
Similarly, the inclined surface 154A and the inclined surface 152B arranged on the outer side in the left-right direction constitute one inclined surface 155, and the inclined surface 152A and the inclined surface 154B arranged on the inner side in the left-right direction constitute one inclined surface 153. .

  Further, the U-shaped steel damper 110 described above is appropriately provided with a portion other than the end portion in the left-right direction in FIG. 1, and connects the lower housing 120 and the upper housing 140.

  As shown in FIGS. 1 and 2, the shape of the lower surface and the upper surface of the slider 180 disposed between the lower housing 120 and the upper housing 140 is the lower inclined surface portion 130 (the inclined surface 132) of the lower housing 120. 134) and the upper inclined surface portion 150 (inclined surfaces 152, 154) of the upper housing are formed.

  That is, the upper and lower inclined surface portions 182 and 184 of the slider 180 abut against the lower inclined surface portion 130 of the lower housing 120 and the upper inclined surface portion 150 of the upper housing 140 to support the load of the upper structure portion 14 (FIG. 1). FIG. 3A).

  3, the slider 180 moves along the inclined surfaces 132 and 134 of the lower inclined surface portion 130 and the inclined surfaces 152 and 154 of the upper inclined surface portion 150, so that the lower housing 120 and the upper housing are moved. 140 is configured to be relatively movable in the left-right direction (detailed description of FIG. 3 will be described later).

  In this embodiment, in such relative movement, the angle of the inclined surfaces 152 and 154 of the upper housing 140 is larger than the angle of the inclined surfaces 132 and 134 of the lower housing 120 as described above. The slider 180 moves along the inclined surfaces 152 and 154 of the upper inclined surface portion 150 of the upper housing 140 rather than the resistance force of the slider 180 relatively moving in the left-right direction along the inclined surfaces 132 and 134 of the lower inclined surface portion 130 of the housing 120. The resistance force that relatively moves in the left-right direction becomes larger.

  In this embodiment, the inclined surfaces 132 and 134 and the inclined surface portion 182 of the slider 180, and the inclined surfaces 152 and 154 and the inclined surface portion 184 of the slider 180 have substantially the same friction resistance (friction coefficient and contact area). It is comprised so that. That is, in this embodiment, the difference in the magnitude of the resistance force that the slider 180 moves in the left-right direction is determined only by the angle of the inclined surface.

  In the present embodiment, a lubricant layer such as PTFE is provided on the surface of the inclined surface by coating or the like in order to make the slider easy to slide, that is, to reduce the friction coefficient.

Next, the operation and effect of this embodiment will be described.
As shown in FIGS. 1 and 3, the seismic isolation device 100 of this embodiment is provided between the lower structure portion 12 and the upper structure portion 14 constituting the structure 10, and the slider 180 is provided in the lower housing 120. The lower structure portion 12 is supported while the upper structure portion 14 is supported in the vertical direction by contacting the inclined surfaces 132 and 134 of the lower inclined surface portion 130 and the inclined surfaces 152 and 154 of the upper inclined surface portion 150 of the upper housing 140. It supports so that relative movement is possible with a resistance in the left-right direction.

  In the event of an earthquake, the lower housing 120 and the upper housing 140 move relative to each other in the left-right direction, thereby providing a seismic isolation effect. That is, the horizontal force transmitted from the lower structure part 12 (the base part in the present embodiment) to the upper structure part 14 is reduced by moving the upper structure part 14 (the building part in the present embodiment) in the left-right direction. At the same time, the period of the upper structure portion 14 is lengthened, and the seismic force generated in the upper structure portion 14 is suppressed.

  In the present embodiment, as described above, the angle of the inclined surfaces 152 and 154 of the upper housing 140 is set larger than the angle of the inclined surfaces 132 and 134 of the lower housing 120, thereby The slider 180 moves in the left-right direction along the inclined surfaces 152, 154 of the upper inclined surface portion 150 of the upper housing 140 rather than the resistance force that the slider 180 moves in the left-right direction along the inclined surfaces 132, 134 of the lower inclined surface portion 130. It is set so that the resistance force that moves relative to is larger.

  Therefore, as shown in FIG. 3B, when the seismic motion is less than or equal to a predetermined value, the lower housing 120 and the slider 180 move relative to each other in the left-right direction, thereby exhibiting a seismic isolation effect. At this time, the upper housing 140 and the slider 180 do not move relative to each other.

  As shown in FIG. 3C, when the earthquake motion is larger than a predetermined value, in addition to the relative movement of the lower housing 120 and the slider 180 in the left-right direction, the upper housing 140 is relative to the slider 180 in the left-right direction. The seismic isolation effect is demonstrated by moving.

FIG. 11 is a graph showing the relationship between the angle (α) of the inclined surface (slip interface), the friction coefficient (μ), the horizontal force H, and the axial force G. The conditions for the slider 180 to move in the horizontal direction relative to the lower housing 120 constituting the seismic isolation device 100 and the slider 180 to move in the horizontal direction relative to the upper housing 140 are as follows. It is necessary to satisfy the formula.
H / G ≧ (tan α + μ) / (1−μ tan α)

The resistance force when the slider 180 moves in the left-right direction becomes a damping force that absorbs energy and attenuates vibration.
Further, since the slider 180 moves along the inclined surfaces 132, 134, 152, and 154, when the lower housing 120 moves relative to the upper housing 140 in the left-right direction, the upper housing 140 moves relative to the lower housing 120. It moves in the vertical direction as well as in the horizontal direction. Therefore, the energy absorption effect by the vertical movement of the upper structure portion 14 is also obtained.
Furthermore, in the present embodiment, vibration energy is absorbed and vibration is attenuated also when the U-shaped steel damper 110 is deformed with the relative movement of the lower housing 120 and the upper housing 140 in the horizontal direction.

  Here, in the case of a sliding seismic isolation device that does not have two-stage resistance in the left-right direction as in this embodiment, that is, in the case of a sliding seismic isolation device that has one level of resistance, the seismic isolation is reduced by reducing the resistance. Although the effect is high, large displacement occurs when the ground motion is large. Therefore, it is necessary to ensure the amount of movement of the upper and lower housings corresponding to this large displacement. In addition, if the amount of movement is not secured, the seismic isolation effect is limited. Conversely, if the resistance force is increased, a sufficient seismic isolation effect cannot be obtained with small earthquake motions.

On the other hand, since the seismic isolation device 100 of this embodiment has two stages of resistance in the left-right direction, it effectively exhibits seismic isolation effects against a wide range of earthquake motions.
For example, if the above-mentioned predetermined ground motion is a design target (assumed), the seismic motion targeted for design exhibits a high seismic isolation effect (response acceleration reduction effect) and a strong ground motion that is greater than the design target (assumed). Can also ensure safety.
Therefore, the seismic isolation apparatus 100 of this embodiment can respond to a wide range of seismic motion.

  Further, the lower inclined surface portion 130 of the lower housing 120 and the upper inclined surface portion 150 of the upper housing 140, and in this embodiment, the inclined surface portions 182 and 184 of the slider 180 are also linear in a vertical section (see FIG. 1). ). In this way, it is easier to form a linear inclined surface than to form a curved surface.

  Therefore, the seismic isolation apparatus 100 of this embodiment exhibits the seismic isolation effect which can respond | correspond to the magnitude | size of a wide seismic motion at low cost.

  Further, as shown in FIG. 3B, even if the lower housing 120 and the slider 180 move relative to each other in the left-right direction, the upper housing 140 is supported by two inclined surfaces as indicated by the arrow G2. No tilting force is generated. Further, as shown in FIG. 3C, even if the upper housing 140 and the slider 180 move relative to each other, they are supported by two inclined surfaces as indicated by an arrow G1, so that a force that causes the upper housing 140 to tilt is exerted. Does not occur. Therefore, the configuration is well balanced.

<Second embodiment>
Next, the seismic isolation device according to the second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as 1st embodiment, and the overlapping description is abbreviate | omitted.

  In the present embodiment, the lower housing 120 has the same structure as that of the first embodiment. The angles of the inclined surfaces 252 and 254 of the upper inclined surface portion 250 of the upper housing 240 and the angles of the inclined surfaces 132 and 134 of the lower inclined surface portion 130 of the lower housing 120 are the same angle. That is, the lower inclined surface portion 130 of the lower housing 120 and the upper inclined surface portion 250 of the upper housing 240 have the same shape.

  The upper surface of the slider 280 is formed with an inclined surface portion 284 that contacts the inclined surfaces 252 and 254 of the upper inclined surface portion 250 of the upper housing 240. The lower surface of the slider 280 is formed with an inclined surface portion 282 having the same shape as the upper surface. However, the inclined surface portion 282 is formed with a plurality of hemispherical convex portions 286 that abut on the inclined surface 132 and a plurality of hemispherical convex portions 288 that abut on the inclined surface 134. The convex portions 286 and 288 are in contact with and support the inclined surfaces 132 and 134 of the lower housing 120.

Next, functions and effects of the present embodiment will be described.
In the present embodiment, the angle of the inclined surfaces 252 and 254 of the upper inclined surface portion 250 of the upper housing 240 and the angle of the inclined surfaces 132 and 134 of the lower inclined surface portion 130 of the lower housing 120 are the same angle and friction coefficient. Are almost the same. However, a plurality of hemispherical convex portions 286 and 288 are formed on the lower surface of the slider 280, and the convex portions 286 and 288 are in contact with and support the inclined surfaces 132 and 134 of the lower housing 120.

  Therefore, the inclined surfaces 132 and 134 of the lower housing 120 and the convex portions 286 and 288 of the lower surface of the slider 280 are larger than the contact area where the inclined surfaces 252 and 254 of the upper housing 240 and the inclined surface portion 284 of the upper surface of the slider 280 are in contact. The contact area that contacts with is smaller. As a result, the friction between the inclined surfaces 132 and 134 of the lower housing 120, the lower surface of the slider 280, and the convex portions 286 and 288 rather than the frictional resistance between the inclined surfaces 252 and 252 of the upper housing 240 and the inclined surface portion 284 of the slider 280. Resistance becomes smaller.

  Accordingly, the inclined surfaces 252 and 254 of the upper inclined surface portion 250 of the upper housing 240 are more resistant than the resistance force that the slider 280 relatively moves in the left-right direction along the inclined surfaces 132 and 134 of the lower inclined surface portion 130 of the lower housing 120. The resistance force that the slider 280 moves relative to the left and right along the direction becomes larger.

  Therefore, as in the first embodiment, when the seismic motion is less than or equal to a predetermined value, the lower housing 120 and the slider 280 move relative to each other in the left-right direction to exhibit a seismic isolation effect (see FIG. 3B). When the seismic motion is larger than the predetermined value, the upper housing 240 further moves in the left-right direction relative to the slider 280 to exert a seismic isolation effect (see FIG. 3C). Therefore, the seismic isolation device 200 of the present embodiment can cope with a wide range of seismic motion.

  Further, the upper surface 120A (lower inclined surface portion 130) of the lower housing 120 and the lower surface 240A (upper inclined surface portion 250) of the upper housing 240 are configured to have the same shape. Therefore, for example, the upper surface 120A (lower inclined surface portion 130) of the lower housing 120 and the lower surface 240A (upper inclined surface portion 250) of the upper housing 240 can be molded with the same mold. Furthermore, by making the other components (for example, thickness) the same shape, the lower housing 120 and the upper housing 240 can have exactly the same structure. That is, the lower housing 120 is disposed upside down to form the upper housing 240.

  Therefore, the lower housing 120 and the upper housing 240 can be manufactured at a lower cost than the configuration in which the shape of the upper surface of the lower housing and the shape of the lower surface of the upper housing are different.

  Here, in the first embodiment, by changing the angle of the inclined surface of the upper housing and the angle of the inclined surface of the lower housing, the slider moves in the left-right direction along the inclined surface of the lower inclined surface portion of the lower housing. The resistance force for relative movement and the resistance force for relative movement of the slider in the left-right direction along the inclined surface of the upper inclined surface portion of the upper housing were set to be different.

  On the other hand, in the second embodiment, by changing the contact area where the inclined surface of the upper housing and the upper surface of the slider are in contact with each other and the contact surface where the inclined surface of the lower housing and the lower surface of the slider are in contact with each other, A resistance force that the slider relatively moves in the left-right direction along the inclined surface of the lower inclined surface portion of the side housing, and a resistance force that the slider relatively moves in the left-right direction along the inclined surface of the upper inclined surface portion of the upper housing. Set differently.

However, the resistance may be set differently by other methods.
For example, by changing the friction coefficient at which the inclined surface of the upper housing and the upper surface of the slider are in contact with the friction coefficient at which the inclined surface of the lower housing is in contact with the lower surface of the slider, the resistance force may be set differently. Good. Or you may set so that resistance may differ by combining an angle, a contact area, and a friction coefficient.

Further, in the first embodiment and the second embodiment, the upper housing is more inclined to the inclined surface of the upper housing than the resistance force that the slider relatively moves in the left-right direction along the inclined surface of the lower inclined surface of the lower housing. The resistance force relative to the slider moving in the horizontal direction along the slider is set to be larger, but the reverse is also possible. That is, the resistance that the slider moves relatively in the left-right direction along the inclined surface of the upper inclined surface portion of the upper housing, rather than the resistance force that the slider moves relatively in the left-right direction along the inclined surface of the lower inclined surface portion of the lower housing. It may be set so that the force becomes larger.
Furthermore, a difference may be provided between the resistance force in the left direction and the resistance force in the right direction.

  In the following embodiments, similarly to the first embodiment, the angle of the inclined surface of the upper housing is larger than the angle of the inclined surface of the lower housing, and the inclination of the lower inclined surface portion of the lower housing is increased. In this example, the slider is set so that the relative resistance in the horizontal direction along the inclined surface of the upper inclined surface of the upper housing is greater than the resistance in which the slider moves in the horizontal direction along the surface. explain.

<Third embodiment>
Next, the seismic isolation device according to the third embodiment of the present invention will be described with reference to FIGS. 5 and 6. In addition, the same code | symbol is attached | subjected to the member same as 1st embodiment and 2nd embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 5, in this embodiment, by introducing prestress (compression force) in the vertical direction between the lower structure portion 12 and the upper structure portion 14, A prestress (compression force) is introduced between the upper housing 141 and the upper housing 141.

  Specifically, by applying tension to the PC steel rod 50 as a tension member disposed so as to penetrate the center of the seismic isolation device 300 in the vertical direction, the lower structure 12 and the upper structure 14 In other words, prestress is introduced between the lower housing 121 and the upper housing 141 of the seismic isolation device 300. In addition, since the method of introducing a prestress between the lower structure part 12 and the upper structure part 14 by giving tension | tensile_strength to the PC steel rod 50 is the same as the existing method, description is abbreviate | omitted.

As shown in FIG. 5 and FIG. 6, the PC steel rod 50 penetrates vertically through the center of the lower housing 121, the upper housing 141, and the slider 181 constituting the seismic isolation device 300 in plan view. Holes 304, 306, and 308 are formed.
The diameters of the through holes 304, 306, and 308 are set so that the PC steel rod 50 does not hit the through holes 304, 306, and 308 even when the lower housing 121 and the upper housing 141 are relatively moved in the horizontal direction. To do.

Next, the operation and effect of this embodiment will be described.
By introducing prestress between the lower structure part 12 and the upper structure part 14 in the vertical direction, prestress (compressive force) is applied in a direction in which the lower housing 121 and the upper housing 141 constituting the seismic isolation device 300 approach each other. Is granted. Thereby, the resistance force that the slider 181 moves relatively in the left-right direction along the lower inclined surface portion 130 of the lower housing 121 and the upper inclined surface portion 150 of the upper housing 141 is increased, and as a result, the energy absorption effect is increased.

  Further, even if a force acts in a direction in which the lower housing 121 and the upper housing 141 are separated from each other by the earthquake motion, the slider 181 moves along the lower inclined surface portion 130 of the lower housing 121 and the upper inclined surface portion 150 of the upper housing 141. Resistance is ensured when moving in the left-right direction.

  In the present embodiment, the PC steel bar 50 is inserted through the center of the seismic isolation device 300, but the present invention is not limited to this.

  For example, a configuration in which the PC steel rod 50 is inserted outside the slider 180 may be used as in the seismic isolation device 301 of the modification of the present embodiment shown in FIG. In this case, through holes 305 and 309 are formed at both ends in the horizontal direction of the lower housing 123 and the upper housing 143, and no through holes are formed in the slider 180.

  Furthermore, the structure by which the PC steel bar 50 is arrange | positioned on the outer side of the seismic isolation apparatus 100 may be sufficient like the PC steel bar 50 shown by the imaginary line in FIG. The seismic isolation device 100 in this case is the seismic isolation device 100 of the first embodiment.

  In the examples of FIGS. 7 and 1, the PC steel bars 50 are provided on both the left and right sides. However, the PC steel bars 50 are provided so that prestress (compression force) is equally applied to the seismic isolation device. This part is also provided as appropriate.

<Fourth and fifth embodiments>
Next, the seismic isolation device according to the fourth and fifth embodiments of the present invention will be described with reference to FIGS. 8 and 9. In addition, the same code | symbol is attached | subjected to the member same as 1st embodiment-3rd embodiment, and the overlapping description is abbreviate | omitted.

  In the first embodiment to the third embodiment, even if it is in a state of moving in the left-right direction, as a configuration in which two or more inclined surfaces are in contact with each other in the upper and lower directions, the upper housing is configured not to be applied with a tilting force. .

  On the other hand, in the seismic isolation device 400 of the fourth embodiment shown in FIG. 8 and the seismic isolation device 500 of the fifth embodiment shown in FIG. 9, the inclined surfaces 132, 134, 152, and 154 are configured one by one. It is. In the case of such a configuration, in a state where the slider moves to the left and right (see FIGS. 8B, 8C, 9B, and 9C), the slider contacts a plurality of inclined surfaces. Since the upper housing does not have a force to tilt. However, this tilting force may be actively used as a restoring force.

<Other embodiments>
The shapes of the lower inclined surface portion of the lower housing, the lower inclined surface portion of the upper housing, and the slider are not limited to the shapes of the first to fifth embodiments. Any shape is acceptable.

  For example, as in the seismic isolation device 610 shown in FIG. 10A, the vertical sectional shape of the lower inclined surface portion 614 of the lower housing 612 is M-shaped, and the vertical of the upper inclined surface portion 618 of the upper housing 616 is vertical. The cross-sectional shape may be W-shaped. Alternatively, as in the seismic isolation device 620 shown in FIG. 10B, both the shape of the vertical section of the lower inclined surface portion 624 of the lower housing 622 and the shape of the vertical cross section of the upper inclined surface portion 628 of the upper housing 626 are M. It may be a letter shape. Further, as in the seismic isolation device 630 shown in FIG. 10C, both the shape of the vertical section of the lower inclined surface portion 634 of the lower housing 632 and the shape of the vertical cross section of the upper inclined surface portion 638 of the upper housing 636 are W. It may be a letter shape.

  Furthermore, a structure other than a circular shape in plan view may be used. For example, the structure may be a rectangular shape in plan view, and a seismic isolation effect can be obtained only in a predetermined left-right direction.

  Moreover, in the said embodiment, although the seismic isolation apparatus to which this invention was applied was applied to the basic seismic isolation structure, it is not limited to this. You may apply to an intermediate seismic isolation structure and a base isolation frame.

  The present invention is not limited to the above embodiment. Needless to say, the present invention can be implemented in various modes without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Structure 12 Lower structure part 14 Upper structure part 50 PC steel bar (compressive force provision means)
DESCRIPTION OF SYMBOLS 100 Seismic isolation device 120 Lower housing 120A Upper surface 121 Lower housing 123 Lower housing 130 Lower inclined surface part 132 Inclined surface 133 Inclined surface 134 Inclined surface 135 Inclined surface 140 Upper housing 140A Lower surface 141 Upper housing 143 Upper housing 150 Upper inclined surface portion 152 Inclined surface 153 Inclined surface 154 Inclined surface 155 Inclined surface 180 Slider 181 Slider 200 Seismic isolation device 240A Lower surface 240 Upper housing 250 Upper inclined surface portion 252 Inclined surface 254 Inclined surface 280 Slider 300 Seismic isolation device 301 Seismic isolation device 400 Seismic isolation device 500 Seismic isolation device 610 Seismic isolation device 612 Lower housing 614 Lower inclined surface portion 616 Upper housing 618 Upper inclined surface portion 620 Seismic isolation device 622 Lower housing 624 Lower Side inclined surface portion 626 Upper housing 628 Upper inclined surface portion 630 Seismic isolation device 632 Lower housing 634 Lower inclined surface portion 636 Upper housing 638 Upper inclined surface portion

Claims (4)

A lower housing provided on the lower structure,
An upper housing disposed on the lower housing and provided below the upper structure;
A lower side formed on the upper surface of the lower housing and having an inclined surface that is inclined upward from one side in the horizontal direction to the other side and an inclined surface that is inclined upward from the other side in the horizontal direction to the one side An inclined surface,
An upper side formed on a lower surface of the upper housing and having an inclined surface that is inclined upward from one side in the horizontal direction to the other side and an inclined surface that is inclined upward from the other side in the horizontal direction to the one side An inclined surface,
The upper housing is disposed between the lower housing and the upper housing and abuts against an inclined surface of the lower inclined surface portion of the lower housing and an inclined surface of the upper inclined surface portion of the upper housing. A load is supported, and is configured to be movable relative to the lower housing and the upper housing in the left-right direction by moving along the inclined surface of the lower inclined surface portion and the inclined surface of the upper inclined surface portion. A slider,
Have
The slider is relatively moved in the left-right direction along the inclined surface of the lower inclined surface portion of the lower housing, and the slider is relatively moved in the left-right direction along the inclined surface of the upper inclined surface portion of the upper housing. Seismic isolation devices that are set so that the resistance to move is different. A compression force applying means for applying a compression force in a direction in which the lower housing and the upper housing are brought close to each other;
The seismic isolation device according to claim 1. The lower inclined surface portion of the lower housing and the side inclined surface portion of the upper housing are inclined surfaces that are inclined upward from one side in the horizontal direction to the other side and rise from the other side in the horizontal direction to the one side. Each having two or more sloped surfaces,
The seismic isolation device according to claim 1 or claim 2. The lower inclined surface portion and the upper inclined surface portion are configured such that the upper surface of the lower housing and the lower surface of the upper housing have the same shape.
The seismic isolation apparatus of any one of Claims 1-3.

Images