Collision buffer material for seismic isolated buildings and seismic isolated buildings

Abstract

To provide a collision shock absorbing member for a seismically isolated building, which enables avoidance of direct collision between an upper structure and a stopper, has stable characteristics and enables adjustment of cushioning capacity of the member depending on the degree of the collision, and a seismically isolated building.SOLUTION: A collision shock absorbing member for a seismically isolated building 1 is provided, which is fixed to at least one of an upper structure and a stopper for restricting relative displacement of the upper structure in a predetermined horizontal direction and reduces the impact of the upper structure occurring when the upper structure collides with the stopper. The collision shock absorbing member is formed in a predetermined shape by assembling a large number of chip-shaped rubber chips 5 and has a void 6 inside.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a collision buffer member used to mitigate the impact when a seismically isolated building displaced horizontally during an earthquake collides with a stopper such as a retaining wall, and to a seismically isolated building that uses the collision buffer member. [Background technology]

[0002] In a seismically isolated building, an upper structure is supported on a lower structure such as a foundation via a seismic isolation device, and when an earthquake occurs, the upper structure is displaced horizontally relative to the lower structure to suppress the transmission of shaking to the inside of the upper structure. In order to regulate this relative displacement of the upper structure, a stopper such as a retaining wall is provided on the lower structure, but if the shaking is severe, there is a risk of the upper structure being damaged when it collides with the stopper. To prevent this damage, a technology is known in which a collision buffer member for a seismically isolated building is provided on at least one of the upper structure and the stopper to prevent a direct collision between the upper structure and the stopper. In particular, Patent Document 1 discloses an invention in which a rubber chip damper made of rubber chips stored in a soft rubber case is used as a collision buffer member for a seismically isolated building. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-211681 A Summary of the Invention [Problem to be solved by the invention]

[0004] The conventional rubber chip dampers described above have a structure in which rubber chips are packed inside a soft case, so that characteristics such as the restitution coefficient and rigidity are unstable, and it is not possible to adjust the cushioning capacity according to the degree of impact.

[0005] Therefore, the present invention aims to provide a collision cushioning material for a seismically isolated building and a seismically isolated building that can avoid direct collision between the upper structure and the stopper, while also providing stable characteristics and enabling the cushioning capacity to be adjusted according to the degree of collision. [Means for solving the problem]

[0006] In order to achieve the above object, a first aspect of the present invention provides a seismically isolated building in which a seismic isolation device is disposed between a lower structure and an upper structure, and a stopper is provided on the lower structure to regulate the relative displacement of the upper structure in a predetermined horizontal direction with respect to the lower structure, the first aspect of the present invention being a collision buffer member for a seismically isolated building, the collision buffer member being fixed to at least one of the upper structure and the stopper and mitigating impact when the upper structure collides with the stopper, the collision buffer member comprising: A number of elastic chips are bonded with a binder to form a specific shape, and have internal voids. Along with, The porosity increases continuously or intermittently toward the opposing side with which the device collides when regulating relative displacement in the horizontal direction, or the device has a main body portion that directly collides with the opposing side with which the device collides when regulating relative displacement, and a fixed portion that is fixed to one of the main body portions, and the porosity of the fixed portion is smaller than the porosity of the main body portion. It is characterized by: Another aspect of the first invention is characterized in that, in the above-mentioned configuration, the restitution coefficient decreases continuously or intermittently toward a counterpart with which the ball collides when the relative displacement in the horizontal direction is restricted. Another form of the first invention is characterized in that, in the above configuration, the cross-sectional area in the vertical direction perpendicular to the horizontal direction becomes smaller continuously or intermittently toward the opposing side that will collide when relative displacement in the horizontal direction is restricted. Another aspect of the first invention is characterized in that, in the above-mentioned configuration, the elastic body is a rubber chip using vulcanized rubber. Another aspect of the first invention is characterized in that in the above-mentioned configuration, the main body portion and the fixing portion are integrally formed from the same material. Another aspect of the first invention is characterized in that, in the above-mentioned configuration, the porosity of the main body is 10 to 50%. Another aspect of the first invention is characterized in that, in the above-mentioned configuration, the fixing portion has a porosity of 20% or less. Another aspect of the first invention is characterized in that, in the above configuration, the main body has a specific gravity of 0.75 to 0.95. In order to achieve the above object, the second aspect of the present invention is a seismic isolation building, The lower structure; A superstructure; a seismic isolation device disposed between the lower structure and the upper structure; a stopper provided on the lower structure to restrict relative displacement of the upper structure in a predetermined horizontal direction; The present invention is characterized in that at least one of the stopper and the upper structure is provided with a collision-absorbing member for a seismically isolated building according to any one of the first inventions. In another aspect of the second invention, in the above configuration, the lower structure is a foundation, and the stopper is a retaining wall provided on the foundation and surrounding the outside of the upper structure, The collision-absorbing member for seismically isolated buildings is provided on at least one of the outer wall and retaining wall of the upper structure which face each other, and is characterized in that a gap is provided between the collision-absorbing member for seismically isolated buildings and the other side which is arranged opposite the collision-absorbing member for seismically isolated buildings and which collides with when restricting relative displacement. In order to achieve the above object, the third aspect of the present invention is a seismic isolation building, The lower structure; A superstructure; a seismic isolation device disposed between the lower structure and the upper structure; a stopper provided on at least one of the lower structure and the upper structure to restrict relative displacement of the upper structure in a predetermined horizontal direction; A seismically isolated building in which a shock absorbing member for a seismically isolated building is provided on at least one of a stopper and a counter part with which the stopper faces and collides when regulating a relative displacement, the shock absorbing member absorbing the shock when regulating a relative displacement, The impact buffer material for seismic isolation buildings is made by assembling a number of elastic chips by bonding them with a binder to form a specific shape, and has voids inside. At the same time, the void ratio increases continuously or intermittently toward the opposing side with which the device collides when regulating relative displacement in the horizontal direction, or the device has a main body portion that directly collides with the opposing side with which the device collides when regulating relative displacement, and a fixed portion that is fixed to one of the main body portions, and the void ratio of the fixed portion is smaller than the void ratio of the main body portion. It is characterized by: Another aspect of the third invention is characterized in that, in the above configuration, a gap is provided between the collision-cushioning member for seismically isolated buildings and the opposing side with which the collision-cushioning member for seismically isolated buildings faces and with which it will collide when regulating relative displacement. Effect of the Invention

[0007] According to the present invention, direct collision between the upper structure and the stopper can be avoided, and stable characteristics can be obtained, making it possible to adjust the cushioning capacity according to the degree of collision. In particular, since the elastic bodies are bonded together with a binder, production can be completed in a short period of time. In particular, the horizontal restitution coefficient for impact shock absorbing materials for seismic isolation buildings but Continuously or intermittently The porosity increases continuously or intermittently. Orthogonal to the horizontal direction In the vertical direction The cross-sectional area is continuous or discontinuous Become smaller According to this aspect, energy in the event of a collision can be effectively absorbed. In particular, in the embodiment in which the elastic body is rubber chips made of vulcanized rubber, it is possible to manufacture the elastic body at low cost by using waste tires or the like. In particular, in an embodiment in which the impact cushioning member for a seismically isolated building comprises a main body portion and a fixing portion, and the porosity of the fixing portion is smaller than that of the main body portion, the fixing portion is more compressed than the main body portion. Therefore, the fixing portion is not destroyed before the main body portion, and the fixing portion can be reliably fixed to a stopper or the like. In particular, according to an embodiment in which the main body portion and the fixing portion are integrally formed from the same material, the collision buffer member for seismically isolated buildings can be manufactured at low cost. In particular, according to an embodiment in which the porosity of the main body is set to 10 to 50%, a main body suitable for absorbing collision energy can be obtained. In particular, according to an embodiment in which the porosity of the fixing portion is set to 20% or less, a fixing portion that is appropriately compressed can be obtained. In particular, according to an embodiment in which the specific gravity of the main body is set to 0.75 to 0.95, an elastic body suitable for shock absorbing is obtained. [Brief description of the drawings]

[0008] [Figure 1] An explanatory diagram of a crash cushioning material for seismically isolated buildings: (A) shows the front, (B) shows the side, and (C) shows the internal structure. [Diagram 2] FIG. 1 is an explanatory diagram of a seismically isolated building. [Diagram 3]FIG. 13 is an explanatory diagram of another example of a seismically isolated building. [Figure 4] An explanatory diagram of the intermediate seismic isolation layer, (A) shows the front view and (B) shows the top view. [Diagram 5] An explanatory diagram of the intermediate isolation layer in a displaced state, where (A) shows the front view and (B) shows the top view. [Figure 6] FIG. 13 is a perspective view showing a specific example of a stopper mechanism. [Figure 7] FIG. 13 is a perspective view showing another specific example of the stopper mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, a collision-absorbing member for a seismically isolated building (hereinafter simply referred to as a "collision-absorbing member") according to the first aspect of the present invention will be described. FIG. The impact buffer member 1 is a block body having a horizontally elongated rectangular shape when viewed from the front, and a thick main body portion 2 having a square shape when viewed from the front is formed in the center in the longitudinal direction. A pair of fixing portions 3, 3 that are thinner than the main body portion 2 are formed in a flange shape on the left and right sides of the main body portion 2. Each fixing portion 3 has two mounting holes 4, 4 formed therein. The impact buffer member 1 is made by assembling a large number of rubber chips 5, 5·, which are made by cutting vulcanized rubber from waste tires or the like into small pieces, bonding them together under heat and pressure with a urethane or ether binder, and forming voids 6, 6· inside. The specific gravity of the main body 2 is 0.75 to 0.95. However, the porosity of the main body 2 and the fixing part 3 is different, with the porosity of the main body 2 being 10 to 50%, preferably 30%, while the porosity of the fixing part 3 is set to 20% or less. In addition, the porosity of the fixing part 3 is set so as not to be equal to or greater than the porosity of the main body 2.

[0010] Fig. 2 shows an example of a seismically isolated building 10 corresponding to the second invention. Here, seismic isolation devices 13, 13... are provided between a foundation 11, which is a lower structure, and an upper structure 12. The foundation 11 is formed in a concave shape from the ground surface, and is provided with a retaining wall 14 that acts as a stopper on its outer periphery. The seismic isolation device 13 is formed of laminated rubber or the like, is placed on the bottom surface of the foundation 11, and supports the upper structure 12. A gap is set between the upper structure 12 and the retaining wall 14 to allow horizontal displacement of the upper structure 12. The collision-absorbing members 1 are attached in groups of one each at a predetermined interval in the horizontal direction to each of the four faces of the upper structure 12, for example, with the fixing parts 3, 3 facing up and down, by bolts (not shown) passing through the mounting holes 4, 4. In this state, the main body 2 of each collision-absorbing member 1 faces the inner wall of the retaining wall 14, with a gap maintained.

[0011] In the seismically isolated building 10 constructed as described above, when an earthquake occurs, the seismic isolation device 13 displaces horizontally to displace the upper structure 12 relative to the foundation 11 in the horizontal direction, suppressing shaking inside the upper structure 12. If a major earthquake causes the upper structure 12 to displace excessively and approach the retaining wall 14, the outer wall of the upper structure 12 collides with the retaining wall 14 via the collision buffer member 1, restricting the displacement of the upper structure 12. At this time, the main body 2 of the collision buffer member 1 compresses and deforms in the thickness direction to absorb the collision energy. Therefore, the impact force is greatly mitigated, and damage to the upper structure 12 and the retaining wall 14 is prevented. In particular, since the collision-buffering member 1 has an internal void 6, when the amount of collision of the upper structure 12 is relatively small, the deformation amount of the main body 2 is small and the void 6 is compressed, resulting in low rigidity. On the other hand, when the amount of collision of the upper structure 12 is relatively large, the deformation amount of the main body 2 is large and, after the void 6 is compressed, the rubber chips 5 and the binder are compressed, resulting in high rigidity.

[0012] For this reason, when the impact force when the upper structure 12 collides with the collision buffer 1 is small (the stage where the voids 6 are compressed), the restitution coefficient is small, so the displaced upper structure 12 is gently received and the collision energy can be effectively absorbed. On the other hand, when the impact force when the upper structure 12 collides with the collision buffer 1 is large (the stage where the rubber chips 5 and the binder are compressed), the restitution coefficient is large, so the displacement of the upper structure 12 is suppressed by a reaction force that increases at an accelerated rate not proportional to the amount of compression, and the increased restitution force pushes the upper structure 12 back to the opposite side.

[0013] Thus, according to the above-mentioned form of collision-buffering member 1, a large number of chip-shaped rubber chips 5 (elastic body) are assembled to form a predetermined shape, and have an internal gap 6, which makes it possible to avoid direct collision between the upper structure 12 and the retaining wall 14, while also obtaining stable characteristics and enabling adjustment of the cushioning capacity according to the degree of collision. In particular, since the restitution coefficient of the main body 2 varies continuously in the horizontal direction, energy can be effectively absorbed in the event of a collision. In addition, since the elastic body is made of rubber chips 5 using vulcanized rubber, it can be manufactured inexpensively by using waste tires or the like. In addition, since the rubber chips 5 are assembled by bonding with a binder, they can be produced in a short time.

[0014] In particular, the collision-absorbing member 1 has a main body portion 2 that collides with the opposing retaining wall 14 (opposite side), and a fixing portion 3 that is fixed to the upper structure 12, and the porosity of the fixing portion 3 is smaller than the porosity of the main body portion 2. Therefore, the fixing portion 3 is more compressed than the main body portion 2, and can be reliably fixed to the upper structure 12. Furthermore, the fixing portion 3 will not break before the main body portion 2. Furthermore, since the main body 2 and the fixed portion 3 are integrally formed from the same material, the impact-absorbing member 1 can be manufactured at low cost. Furthermore, the porosity of the main body 2 is 10 to 50%, which makes the main body 2 suitable for absorbing impact energy. Moreover, since the porosity of the fixing part 3 is 20% or less, a fixing part 3 that is appropriately compressed can be obtained. Furthermore, the specific gravity of the main body 2 is 0.75 to 0.95, so that an elastic body suitable for shock absorbing is obtained.

[0015] Furthermore, according to the above-mentioned form of seismically isolated building 10, the building comprises a foundation 11 (lower structure), an upper structure 12, a seismic isolation device 13 arranged between the foundation 11 and the upper structure 12, and a retaining wall 14 (stopper) provided on the foundation 11 and regulating the relative displacement of the upper structure 12 in a specified horizontal direction, and a collision buffer member 1 is provided on the upper structure 12. This configuration can effectively mitigate excessive impact force when the upper structure 12 collides with the retaining wall 14. Furthermore, the adoption of the collision buffer member 1 can prevent direct collision between the upper structure 12 and the retaining wall 14, and also provides stable characteristics, making it possible to adjust the buffer capacity according to the degree of collision. In particular, since a gap is provided between the collision-absorbing member 1 and the retaining wall 14 arranged opposite the collision-absorbing member 1, even when the collision-absorbing member 1 is provided, it is possible to alleviate the impact during a collision while allowing relative displacement of the upper structure 12.

[0016] In addition to molding the main body and the fixed part as one unit as in the above embodiment, the impact buffer can also be formed by bonding the fixed part to a separately molded main body by adhesive or the like. In this case, the main body can be divided into a plurality of plate-like members in the thickness direction, and the filling rate of the rubber chips (in other words, the void ratio) of each plate-like member can be changed and laminated and bonded, so that the restitution coefficient can be made to differ intermittently in the displacement direction. In this case as well, the stiffness is low for small displacements and high for large displacements. Furthermore, even if the filling rate of the rubber chips is the same, the restitution coefficient can be changed by forming the main body so that the cross-sectional area becomes smaller continuously or stepwise toward the opposing side (the retaining wall side in the above embodiment). Also, the impact buffer member can be formed by cutting a block of assembled elastic bodies. The shape of the impact buffer member is not limited to the above, and for example, the fixing portion may be provided around the entire periphery of the main body. The main body may also have other shapes, such as a circular shape or a polygonal shape when viewed from the front.

[0017] On the other hand, in the case of the elastomer, the size and shape of the rubber chips are not particularly limited, and the specific gravity is not limited to the numerical value of the above form. However, the specific gravity of the rubber chips is preferably 1 or more. It can also be manufactured from vulcanized rubber other than waste materials. In the above embodiment, the collision buffer members are provided on the upper structure, but they may be provided on the retaining wall. They may also be provided on the retaining wall and the outer wall of the upper structure, so that the collision buffer members collide with each other when the structure is displaced. In this case, a gap is also provided between the collision buffer members. The number and positions of the collision buffer members may be changed as appropriate.

[0018] Fig. 3 shows an example of a seismically isolated building 20 corresponding to the third invention. This seismically isolated building 20 has an intermediate seismically isolated layer 21. As shown in Fig. 4(A), the intermediate seismically isolated layer 21 includes a lower frame 22 as a lower structure, an upper frame 23 as an upper structure, and seismic isolation devices 13, 13, ... disposed between the lower frame 22 and the upper frame 23, so that the upper frame 23 can be horizontally displaced relative to the lower frame 22. Here, a stopper mechanism S that restricts the relative displacement of the upper structure 23 is provided in the intermediate seismic isolation layer 21. First, a pair of lower beams 24, 24 are erected facing upward at a predetermined interval on a line along a predetermined horizontal direction (direction A shown in FIG. 4(B)) on the lower structure 22. An energy absorbing member 25 is installed between the lower beams 24, 24 in parallel with direction A. This energy absorbing member 25 is made of H-shaped steel or the like.

[0019] On the other hand, a pair of upper bundles 26, 26 are erected downward on the upper body 23 at a predetermined interval on both sides of the energy absorbing member 25 in the horizontal direction (direction B in FIG. 4) perpendicular to direction A. A collision buffer member 1 is fixed to the surface of each upper bundle 26, 26 facing the energy absorbing member 25 with the fixing parts 3, 3 facing each other. Thus, the body part 2 of each collision buffer member 1 faces the side surface of the energy absorbing member 25. Here, the vertical size of the body part 2 is set to be equal to the vertical size of the side surface of the energy absorbing member 25. Although not shown, another set of this stopper mechanism S is provided in a direction perpendicular to the horizontal direction in FIG. 4.

[0020] In the seismically isolated building 20 constructed as described above, when an earthquake occurs, the seismic isolation device 13 of the intermediate seismic isolation layer 21 displaces horizontally to displace the upper structure 23 relative to the lower structure 22 in the horizontal direction, suppressing the internal shaking of the upper structure 23. When a large earthquake causes the upper structure 23 to be displaced excessively and the upper struts 26, 26 approach the energy absorbing member 25, as shown in FIG. 5, the upper struts 26 collide with the side of the energy absorbing member 25 through the collision buffer member 1 in the stopper mechanism S, and the displacement of the upper structure 23 is restricted. At this time, the main body 2 of the collision buffer member 1 is compressed and deformed in the thickness direction to absorb the collision energy. Therefore, the impact force is greatly mitigated, and damage to the energy absorbing member 25 and the upper struts 26 is prevented. Furthermore, when the main body 2 collides, the energy absorbing member 25 also bends in the horizontal direction, and this deformation also makes it possible to absorb the collision energy. Furthermore, since the vertical sizes of the sides of the main body 2 and the energy absorbing member 25 are the same and the collision cushioning member 1 is fixed with the fixing parts 3,3 oriented vertically, the heads of the bolts fixing the fixing parts 3,3 will not collide with the energy absorbing member 25 even if the main body 2 is compressed and deformed.

[0021] Thus, the seismically isolated building 20 of the above-mentioned form comprises a lower structure 22 (lower structure), an upper structure 23 (upper structure), a seismic isolation device 13 arranged between the lower structure 22 and the upper structure 23, and energy absorbing members 25 and upper struts 26 (stoppers) provided on both the lower structure 22 and the upper structure 23 to regulate the relative displacement of the upper structure 23 in a specified horizontal direction, and a collision buffer member 1 is provided on the upper struts 26. This configuration can effectively reduce the excessive impact force when the upper bundle 26 collides with the energy absorbing member 25. In addition, the adoption of the collision buffer member 1 provides stable characteristics and enables adjustment of the buffer capacity according to the degree of collision. In particular, since a gap is provided between the collision-absorbing member 1 and the energy-absorbing member 25 arranged opposite the collision-absorbing member 1, even when the collision-absorbing member 1 is provided, it is possible to alleviate the impact during a collision while allowing relative displacement of the upper body 23.

[0022] In the embodiments of Figs. 3 to 5, the same changes to the impact buffer members as in the previous embodiments can be adopted. In this embodiment, the collision buffer is provided on the upper string, but it may be provided on the side of the energy absorbing member. The collision buffer may be provided on both the upper string and the energy absorbing member so that the collision buffers collide with each other when the string is displaced. In this case, a gap is provided between the collision buffers. Furthermore, contrary to this configuration, the energy absorbing member may be installed between the upper struts, and a collision buffer member may be provided on at least one of the lower struts and the energy absorbing member. In these examples as well, the number and positions of the impact buffer members can be changed as appropriate.

[0023] 6 shows a specific example of the stopper mechanism S. The lower strut 24 is formed of an H-shaped steel erected upward from the lower body 22. A rib plate 30 is fixed horizontally to the upper part of the lower strut 24 at the same height as the web of the energy absorbing member 25, and an end of the energy absorbing member 25 is fixed onto the rib plate 30. Cross-shaped reinforcing ribs 31, 31 are fixed to the outer surfaces of both flanges 24a, 24a at the upper part of the lower strut 24. The energy absorbing member 25 is formed of an H-shaped steel in a horizontal position. The upper struts 26, 26 are formed of H-shaped steel suspended downward from the upper body 23. The collision buffers 1, 1 are attached to flanges 26a, 26a facing each other at the lower part of the upper struts 26, 26. On the opposite side of the collision buffers 1, 1, three rib plates 32, 32... are fixed horizontally at a predetermined interval in the vertical direction between the flanges 26a, 26a.

[0024] In this specific example, the ends of both flanges 25a, 25a of the energy absorbing member 25 fixed onto the rib plates 30, 30 of the lower struts 24, 24 are restricted from moving in the horizontal direction (width direction) between the flanges 24a, 24a of each lower strut 24. Thus, the ends of the energy absorbing member 25 are securely held. Also, since the rib plate 32 is fixed to the upper struts 26, 26 on the side opposite to the collision buffer members 1, 1, deformation of the flanges 26a when colliding with the energy absorbing member 25 can be prevented.

[0025] 7 shows another specific example of the stopper mechanism S. The structures of the energy absorbing member 25 and the upper string 26 are the same as those in FIG. 6, but the structure of the lower string 24A is different from that in FIG. Each lower bundle 24A is a plate-like shape perpendicular to the longitudinal direction of the energy absorbing member 25, and a notch 33 into which the end of the energy absorbing member 25 fits is formed in the upper center. A rib plate 30 that receives the end of the energy absorbing member 25 is horizontally fixed to the lower edge of the notch 33, and a pair of regulating plates 34, 34 that regulate the movement of the energy absorbing member 25 in the width direction are vertically provided on both left and right sides of the notch 33. Flanges 24a, 24a parallel to the regulating plates 34, 34 are provided on both outer sides of each lower bundle 24A, and rib plates 35, 35... are horizontally fixed between the regulating plates 34, 34 and the flanges 24a, 24a. A rib plate 36 located on the extended surface of the rib plates 35, 35 is also horizontally fixed between the ends of the flanges 25a, 25a of the energy absorbing member 25.

[0026] In this specific example, the lower strand 24A has a surface plate shape perpendicular to the energy absorbing member 25, so that the rigidity is higher than that of Fig. 6. In particular, in addition to the surface plate of the lower strand 24A, a rib plate 35 is also arranged on the outside of the restriction plates 34, 34 that restrict the movement of the end of the energy absorbing member 25 in the horizontal direction, so that the movement of the end of the energy absorbing member 25 can be reliably restricted. The rib plate 36 between the flanges 25a, 25a of the energy absorbing member 25 also suppresses deformation of the end of the energy absorbing member 25 itself. [Explanation of symbols]

[0027] Reference Signs List 1·· Collision buffer member for seismically isolated building, 2·· Main body, 3·· Fixing part, 4·· Mounting hole, 10, 20·· Seismic isolated building, 11·· Foundation, 12·· Upper structure, 13·· Seismic isolation device, 14·· Retaining wall, 21·· Intermediate seismic isolation layer, 22·· Lower body, 23·· Upper body, 24, 24A·· Lower beam, 25·· Energy absorbing member, 26·· Upper beam, S·· Stopper mechanism.

Claims

1. In a seismically isolated building in which a seismic isolation device is disposed between a lower structure and an upper structure, and a stopper is provided on the lower structure to regulate the relative displacement of the upper structure in a predetermined horizontal direction with respect to the lower structure, a collision buffer member for a seismically isolated building is fixed to at least one of the upper structure and the stopper and buffers an impact when the upper structure collides with the stopper, It is made by assembling a number of elastic chips by bonding them with a binder into a specific shape, and has voids inside. A collision buffer member for seismically isolated buildings, characterized in that the void ratio increases continuously or intermittently toward the opposing side that will collide with the member when the relative displacement is regulated in the horizontal direction.

2. In a seismically isolated building in which a seismic isolation device is disposed between a lower structure and an upper structure, and a stopper is provided on the lower structure to regulate the relative displacement of the upper structure in a predetermined horizontal direction with respect to the lower structure, a collision buffer member for a seismically isolated building is fixed to at least one of the upper structure and the stopper and absorbs the impact when the upper structure collides with the stopper, It is made by assembling a number of elastic chips by bonding them with a binder into a specific shape, and has voids inside. A collision-absorbing member for seismically isolated buildings, characterized in that it has a main body portion that directly collides with the opposing side when regulating the relative displacement, and a fixed portion that is fixed to one of the main body portions, and the porosity of the fixed portion is smaller than the porosity of the main body portion.

3. 3. A collision buffer member for a seismically isolated building according to claim 1, wherein the coefficient of restitution decreases continuously or intermittently toward the opposing side with which the member collides when the relative displacement in the horizontal direction is regulated.

4. A collision-absorbing member for seismically isolated buildings as described in any one of claims 1 to 3, characterized in that the cross-sectional area in the vertical direction perpendicular to the horizontal direction becomes continuously or intermittently smaller toward the opposing side that will collide when the relative displacement is regulated in the horizontal direction.

5. 5. The impact buffer member for a seismic isolated building according to claim 1, wherein the elastic body is a rubber chip made of vulcanized rubber.

6. 3. The collision buffer member for a seismically isolated building according to claim 2, wherein the main body portion and the fixing portion are integrally formed from the same material.

7. 7. A crash cushioning member for seismically isolated buildings according to claim 2 or 6, characterized in that the porosity of the main body portion is 10 to 50%.

8. 8. A crash cushioning member for a seismically isolated building according to claim 7, wherein the void ratio of the fixing portion is 20% or less.

9. 9. A crash cushioning member for a seismic isolated building according to claim 2, wherein the specific gravity of said main body portion is 0.75 to 0.

95.

10. The lower structure; A superstructure; a seismic isolation device disposed between the lower structure and the upper structure; a stopper provided on the lower structure to restrict relative displacement of the upper structure in a predetermined horizontal direction; A seismically isolated building, characterized in that at least one of the stopper and the upper structure is provided with a collision buffer member for a seismically isolated building according to any one of claims 1 to 9.

11. The lower structure is a foundation, and the stopper is a retaining wall provided on the foundation and surrounding the outside of the upper structure, The seismically isolated building described in claim 10, characterized in that the collision-absorbing member for the seismically isolated building is provided on at least one of the outer wall and the retaining wall of the upper structure which face each other, and a gap is provided between the collision-absorbing member for the seismically isolated building and the opposing side which is arranged opposite the collision-absorbing member for the seismically isolated building and with which it will collide when the relative displacement is regulated.

12. The lower structure; A superstructure; a seismic isolation device disposed between the lower structure and the upper structure; a stopper provided on at least one of the lower structure and the upper structure to restrict relative displacement of the upper structure in a predetermined horizontal direction; A seismically isolated building is provided with a shock absorbing member for a seismically isolated building that absorbs shock when the relative displacement is restricted on at least one of the stopper and the other side with which the stopper faces and collides when the relative displacement is restricted, The collision buffer material for seismically isolated buildings is formed into a predetermined shape by assembling a large number of chip-shaped elastic bodies by bonding them with a binder, has internal voids, and is characterized in that the void ratio increases continuously or intermittently in the horizontal direction toward the opposing side that will collide when regulating the relative displacement.

13. A lower structure, A superstructure; a seismic isolation device disposed between the lower structure and the upper structure; a stopper provided on at least one of the lower structure and the upper structure to restrict relative displacement of the upper structure in a predetermined horizontal direction; A seismically isolated building is provided with a shock absorbing member for a seismically isolated building that absorbs shock when the relative displacement is restricted on at least one of the stopper and the other side with which the stopper faces and collides when the relative displacement is restricted, The collision buffer member for seismically isolated buildings is formed into a predetermined shape by assembling a large number of chip-shaped elastic bodies by bonding them with a binder, has internal voids, and has a main body part that directly collides with the opposing side that it collides with when regulating the relative displacement, and a fixed part that is fixed to one of the two, and the porosity of the fixed part is smaller than the porosity of the main body part.

14. The seismically isolated building described in claim 12 or 13, characterized in that a gap is provided between the collision buffer member for the seismically isolated building and the opposing side with which the collision buffer member for the seismically isolated building faces and with which it collides when regulating the relative displacement.

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