JP5692335B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device including a laminated rubber body that isolates a structure including a bridge and a building such as a building, a detached house, and a warehouse from earthquake vibration.

  For example, in Patent Document 1, the concentration of distortion generated in the portions of the laminated rubber body adjacent to the upper flange plate coupled to the upper structure of the building and the lower flange plate coupled to the lower structure of the building is concentrated. Laminated rubber body that is provided between the upper flange plate and the lower flange plate and is formed by alternately laminating a plurality of rubber plate layers extending in the horizontal direction and a plurality of steel plate layers in order to relax The rubber plate layers are made of the same material and thickness, and the areas of the rubber plate layers are made different from each other, whereby the rigidity of the rubber plate layers is increased from the upper end and the lower end of the laminated rubber body to the central portion. A laminated rubber-type seismic isolation device has been proposed that gradually decreases as it goes to.

JP-A-11-141180

  By the way, in the seismic isolation device having laminated rubber, the portion of the laminated rubber body (fillet) adjacent to the upper flange plate and the lower flange plate at the time of horizontal deformation due to relative horizontal vibration between the upper structure and the lower structure. It is desirable to provide a means for eliminating the stress concentration that can easily cause buckling and cause buckling.

  The present invention has been made in view of the above-described points, and an object of the present invention is to eliminate stress concentration in the portion of the laminated rubber body adjacent to the upper flange plate and the lower flange plate. An object of the present invention is to provide a seismic isolation device capable of exhibiting the seismic isolation function inherent in the present invention.

  The seismic isolation device of the present invention is provided between the upper flange plate connected to the upper structure, the lower flange plate connected to the lower structure, the upper flange plate and the lower flange plate, and alternately in the vertical direction. A laminated rubber elastic material layer and a laminated rubber body having a rigid material layer. The rigid material layer includes at least one upper rigid material layer disposed in proximity to the upper flange plate, and a lower flange plate. At least one lower rigid material layer disposed in close proximity, and a plurality of intermediate rigid material layers arranged in a vertical direction between the upper rigid material layer and the lower rigid material layer. At least one of the material layer and the lower rigid material layer is horizontal with respect to the adjacent intermediate rigid material layer among the plurality of intermediate rigid material layers adjacent to the one The adjacent intermediate portion rigid material layer is formed in the middle intermediate portion of the plurality of intermediate portion rigid material layers positioned on the center side of the adjacent intermediate portion rigid material layer in the vertical direction. The rigid material layer is formed so as to be equal in length or shorter in the horizontal direction.

  According to the seismic isolation device of the present invention, in particular, at least one of the upper rigid material layer and the lower rigid material layer is relative to the adjacent intermediate rigid material layer among the plurality of intermediate rigid material layers adjacent to the one. Since it is formed to be long in the horizontal direction, stress concentration in the portion of the laminated rubber body (fillet portion) adjacent to the upper flange plate and the lower flange plate can be eliminated, and the adjacent intermediate portion rigid material The layers are of equal length in the horizontal direction with respect to the central intermediate rigid material layer among the plurality of intermediate rigid material layers positioned more centrally than the adjacent intermediate rigid material layer in the vertical direction. Or, because it is formed to be short, it can demonstrate the durability of the repeated stress that it originally has, and can also exhibit the seismic isolation function in the torsional direction. The device can exhibit a seismic isolation function inherent without.

  In the seismic isolation device of the present invention, the rigid material layer may include a plurality of upper rigid material layers that are arranged side by side in the vertical direction and that have the same length in the horizontal direction. Good.

  In the seismic isolation device of the present invention, the rigid material layer includes a plurality of upper rigid material layers arranged side by side in the vertical direction, and the uppermost flange plate of the plurality of upper rigid material layers is the most. The uppermost rigid material layers arranged in proximity to each other are formed to be longer in the horizontal direction than the other upper rigid material layers except the uppermost rigid material layer of the plurality of upper rigid material layers. Also good. According to such a seismic isolation device, even when the laminated rubber body is deformed in the horizontal direction, plastic deformation is unlikely to occur in the plurality of upper rigid material layers, whereby the horizontal rigidity can be stabilized and the stress of the fillet portion can be stabilized. The possibility of causing buckling or the like based on concentration can be eliminated.

  In the seismic isolation device of the present invention, the rigid material layer may include a plurality of lower rigid material layers that are arranged side by side in the vertical direction and that have the same length in the horizontal direction. Good.

  In the seismic isolation device of the present invention, the rigid material layer includes a plurality of lower rigid material layers arranged side by side in the vertical direction, and the lowermost flange plate of the plurality of lower rigid material layers is the most. The lowermost rigid material layers arranged in proximity to each other are formed to be longer in the horizontal direction than the other lower rigid material layers excluding the lowermost rigid material layer among the plurality of lower rigid material layers. Also good. According to such a seismic isolation device, even when the laminated rubber body is deformed in the horizontal direction, plastic deformation is unlikely to occur in the plurality of lower rigid material layers, thereby stabilizing the rigidity in the horizontal direction and the stress of the fillet portion. The possibility of causing buckling or the like based on concentration can be eliminated.

  In the seismic isolation device of the present invention, the laminated rubber body may further include a cylindrical covering layer that is vulcanized and bonded to the outer peripheral edge of the rigid material layer and integrated with the rubber elastic material layer, The covering portion covering at least one of the upper rigid material layer and the lower rigid material layer in the covering layer is horizontally oriented with respect to the covering portion covering the intermediate rigid material layer in the covering layer. It may be protruding.

  In the seismic isolation device of the present invention, at least one of the upper rigid material layer and the lower rigid material layer has a circular outer peripheral edge that is located outward in the horizontal direction from the outer peripheral edges of the plurality of intermediate rigid material layers. May be.

  In the seismic isolation device of the present invention, the plurality of intermediate rigid material layers have a circular outer peripheral edge, and at least one of the circular outer peripheral edges of the upper rigid material layer and the lower rigid material layer has a plurality of intermediate rigid material layers. The diameter may be larger than the circular outer peripheral edge.

  In the seismic isolation device of the present invention, at least one of the upper rigid material layer and the lower rigid material layer has a polygonal outer peripheral edge that is positioned outward in the horizontal direction from the outer peripheral edges of the plurality of intermediate rigid material layers. It may be.

  The seismic isolation device of the present invention may include at least one columnar hole provided in the laminated rubber body and a vibration energy absorber disposed in the at least one columnar hole.

  According to the present invention, there is provided a seismic isolation device capable of eliminating stress concentration in the portion of the laminated rubber body adjacent to each of the upper flange plate and the lower flange plate and exhibiting the seismic isolation function originally provided. Can do.

FIG. 1 is an explanatory cross-sectional view of an example of an embodiment of the present invention. FIG. 2 is a cross-sectional enlarged explanatory view of the example shown in FIG. FIG. 3 is an explanatory diagram mainly showing a rigid material layer in the example shown in FIG. 1. FIG. 4 is a cross-sectional enlarged explanatory view of the example shown in FIG. FIG. 5 is an operation explanatory diagram of the example shown in FIG. FIG. 6 is an enlarged cross-sectional explanatory view of another example of the embodiment of the present invention. FIG. 7 is an explanatory diagram mainly showing a rigid material layer of still another example of the embodiment of the present invention.

  Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.

  1 to 4, the seismic isolation device 1 of the present example includes an upper flange plate 2 connected to an upper structure of a building, a lower flange plate 3 connected to a lower structure composed of a foundation and the like, and an upper flange plate 2. And an annular rubber elastic material layer 4 and an annular rigid material layer which are provided between the lower flange plates 3 and are alternately laminated in the vertical direction V and made of natural rubber or high damping rubber having damping characteristics. 5 and a laminated rubber body 7 having a cylindrical covering layer 6 that is vulcanized and bonded to the outer peripheral edge 16 of the rigid material layer 5 and integrated with the rubber elastic material layer 4. In addition, at least one columnar hole, in this example, one columnar hole 8, a vibration energy absorber 9 disposed in the columnar hole 8, and an upper flange plate on the lower surface and the upper surface of the vibration energy absorber 9 And it is fixed to the lower flange plate 3 and a pair of closure members 10 and 11 on the disc which closes the cylindrical bore 8.

  The columnar hole 8 is defined by the lower surface 13 of the upper closing member 10 and the upper surface 14 of the lower closing member 11 in addition to the inner peripheral surface 12 of the laminated rubber body 7. It is arranged in the center. The vibration energy absorber 9 is made of lead, tin, a tin alloy, or a plastic body made of a thermoplastic resin, for example, cylindrical lead 15, which is densely arranged in the columnar hole 8. The columnar lead 15 absorbs vibration energy by plastic deformation.

  The rigid material layer 5 is disposed close to the lower flange plate 3 and the two annular upper rigid steel plates 21 and 22 as at least one upper rigid material layer disposed close to the upper flange plate 2 in the vertical direction V. Further, two annular lower rigid steel plates 23 and 24 as at least one lower rigid material layer, and upper rigid steel plates 21 and 22 and lower rigid steel plates 23 and 24 are arranged side by side in the vertical direction V. And a plurality of annular intermediate rigid steel plates 25 as a plurality of intermediate rigid material layers. The upper rigid steel plates 21 and 22, the lower rigid steel plates 23 and 24, and the plurality of intermediate rigid steel plates 25 each have the same axis O.

  The upper rigid steel plates 21 and 22 are arranged side by side in the vertical direction V, and the lower rigid steel plates 23 and 24 are arranged side by side in the vertical direction V, respectively. The rigid steel plates 23 and 24 and the plurality of intermediate rigid steel plates 25 are arranged at equal intervals in the vertical direction V, and have the same thickness. Since the steel plates having the same thickness are arranged at equal intervals, the rubber elastic material layers 4 are also arranged at equal intervals with the same thickness.

  Of the upper rigid steel plates 21 and 22, the upper rigid steel plate 21 as the uppermost rigid material layer disposed closest to the upper flange plate 2 is longer in the horizontal direction H than the upper rigid steel plate 22. The circular outer peripheral edge 31 of the upper rigid steel plate 21 has a larger diameter than the circular outer peripheral edge 32 of the upper rigid steel plate 22 and is positioned outward in the horizontal direction. The circular outer peripheral edge 31 of the upper rigid steel plate 21 and the circular outer peripheral edge 32 of the upper rigid steel plate 22 are larger in diameter than the circular outer peripheral edges 35 of the plurality of intermediate rigid steel plates 25 and are located outward in the horizontal direction.

  Of the lower rigid steel plates 23 and 24, the lower rigid steel plate 23 as the lowermost rigid material layer disposed closest to the lower flange plate 3 is longer in the horizontal direction H than the lower rigid steel plate 24. The circular outer peripheral edge 33 of the lower rigid steel plate 23 has a larger diameter than the circular outer peripheral edge 34 of the lower rigid steel plate 24 and is located outward in the horizontal direction. The circular outer peripheral edge 34 of 33 and the lower rigid steel plate 24 is larger in diameter than the circular outer peripheral edges 35 of the plurality of intermediate rigid steel plates 25 and is located outward in the horizontal direction.

  In this example, the upper rigid steel plate 21 and the lower rigid steel plate 23 are formed in the same manner, and the upper rigid steel plate 22 and the lower rigid steel plate 24 are formed in the same manner. In the above rigid material layer 5, each of the upper rigid steel plates 21 and 22 is an intermediate rigid steel plate 26 as an adjacent intermediate rigid material layer adjacent to the upper rigid steel plate 22 among the plurality of intermediate rigid steel plates 25. Each of the lower rigid steel plates 23 and 24 is formed as an adjacent intermediate rigid material layer adjacent to the lower rigid steel plate 24 among the plurality of intermediate rigid steel plates 25. It is formed so as to be longer in the horizontal direction H with respect to the intermediate rigid steel plate 27.

  In the present example, the plurality of intermediate rigid steel plates 25 are formed in the same manner as each other, so that they have the same length in the horizontal direction H, and the intermediate rigid steel plates 26 and 27 are It will have equal length in the horizontal direction H with respect to the intermediate part rigid steel plate 28 as a center side intermediate part rigid material layer located in the center side in the vertical direction V than these. In this example, the plurality of intermediate portion rigid steel plates 25 are formed in the same manner, but instead of this configuration, for example, the intermediate portion rigid steel plates 26 and 27 are arranged in the vertical direction V in the intermediate portion rigid steel plates 25, respectively. It may be formed so as to be shorter in the horizontal direction H with respect to the intermediate rigid steel plate 28 located closer to the center than 26 and 27.

  The covering layer 6 includes a large-diameter annular covering portion 41 covering the upper rigid steel plates 21 and 22, a large-diameter annular covering portion 42 covering the lower rigid steel plates 23 and 24, and a plurality of intermediate portion rigidity. And an annular covering portion 43 covering the steel plate 25. The covering portion 41 is integrally connected to the upper edge of the covering portion 43, and the covering portion 42 is integrally connected to the lower edge of the covering portion 43. The covering portions 41 and 42 protrude in the horizontal direction H with respect to the covering portion 43.

  When manufacturing the seismic isolation device 1, first, a rubber elastic material layer 4 and a rigid material layer 5 are alternately laminated to form a laminated body, and an upper flange plate 2 and a lower part are formed on the upper and lower surfaces of the laminated body. A laminated rubber body 7 is prepared by arranging the flange plate 3 and fixing them to each other by vulcanization adhesion under pressure in the mold, and then to form the columnar lead 15 in the columnar hole 8. Lead is pressed into the columnar hole 8. The press-fitting of lead is performed by pushing lead into the columnar hole 8 with a hydraulic ram or the like so that the columnar lead 15 is constrained by the laminated rubber body 7 in the columnar hole 8 without a gap. After the lead is press-fitted, the closing members 10 and 11 are attached. In the formation of the laminated rubber body 7 by vulcanization adhesion under pressure in the mold, the cylindrical covering layer 6 may be formed so as to cover the outer peripheral edge 16 of the rigid elastic material layer 5.

  In the seismic isolation device 1 described above, when an earthquake or the like occurs and the lower structure vibrates in the horizontal direction H, the laminated rubber body 7 is elastically deformed in the horizontal direction H as shown in FIG. In addition, the cylindrical lead 15 is plastically deformed to absorb the vibration energy with respect to the upper structure of the lower structure and attenuate the vibration. When the laminated rubber body 7 is elastically deformed in the horizontal direction H in this way, the intermediate rigid steel plate 28 is horizontally displaced in the horizontal direction H1 with respect to the intermediate rigid steel plate 27, and the intermediate rigid steel plate 27 is converted to the lower rigid steel plates 23 and 24. The lower rigid steel plate 24 is horizontally displaced relative to the lower rigid steel plate 23 in the horizontal direction H1. At this time, since the lower rigid steel plates 23 and 24 support the intermediate rigid steel plate 25, mainly the intermediate rigid steel plate 27, the compression side portion (fillet portion) adjacent to the lower flange plate 3 of the laminated rubber body 7 is used. While it is difficult to cause stress concentration and the risk of buckling can be eliminated, a portion (intermediate portion) in which a plurality of intermediate rigid steel plates 25 and rubber elastic material layers 4 having a sufficient cross-sectional area are alternately laminated is provided. The inherent seismic isolation mechanism can be exhibited, and the lower rigid steel plate 23 supports the lower rigid steel plate 24 even during such elastic deformation, so that the plastic deformation and horizontal rigidity of the laminated rubber body 7 can be further improved. It can be stabilized. The upper rigid steel plates 21 and 22 also act in the same manner as the lower rigid steel plates 23 and 24 when the laminated rubber body 7 is elastically deformed in relation to the intermediate rigid steel plates 26 and 28.

  According to the seismic isolation device 1 of this example, the upper flange plate 2 connected to the upper structure, the lower flange plate 3 connected to the lower structure, and the upper flange plate 2 and the lower flange plate 3 are provided. And a laminated rubber body 7 having a rubber elastic material layer 4 and a rigid material layer 5 that are alternately laminated in the vertical direction V. The rigid material layer 5 is disposed close to the upper flange plate 2. Upper rigid steel plates 21 and 22 as at least one upper rigid material layer, lower rigid steel plates 23 and 24 as at least one lower rigid material layer disposed in proximity to the lower flange plate 3, upper rigid steel plates 21 and 22, A plurality of intermediate rigid steel plates 25 as a plurality of intermediate rigid material layers arranged side by side in the vertical direction V between the lower rigid steel plates 23 and 24; The upper rigid steel plates 21 and 22 and the lower rigid steel plates 23 and 24 are horizontal with respect to the intermediate rigid steel plates 26 and 27 as adjacent intermediate rigid material layers among the plurality of intermediate rigid steel plates 25 adjacent thereto. The intermediate portion rigid steel plates 26 and 27 are formed so as to be longer in H, and the middle portion of the plurality of intermediate portion rigid steel plates 25 located in the center side of the intermediate portion rigid steel plates 26 and 27 in the vertical direction V. Each of the upper flange plate 2 and the lower flange plate 3 is formed so as to have an equal length or a shorter length in the horizontal direction H with respect to the intermediate portion rigid steel plate 28 as the side intermediate portion rigid material layer. The stress concentration in the portion of the laminated rubber body 7 (fillet portion) close to the surface can be eliminated, and the durability of repeated stress inherent in the laminated rubber body 7 can be reduced. It can volatilization, etc., which may also exhibit seismic isolation function twisting direction, can exhibit seismic isolation function with the device originally without increasing the size of the device.

  According to the seismic isolation device 1, the rigid material layer 5 includes a plurality of upper rigid steel plates 21 and 22 that are arranged side by side in the vertical direction V, of the upper rigid material layers 21 and 22. Since the upper rigid steel plate 21 as the uppermost rigid material layer disposed closest to the upper flange plate 2 is formed to be longer in the horizontal direction H than the upper rigid steel plate 22, the laminated rubber Even when the body 7 is deformed in the horizontal direction, plastic deformation is unlikely to occur in the plurality of upper rigid steel plates 21 and 22, whereby the rigidity in the horizontal direction H can be stabilized, and buckling or the like based on stress concentration in the fillet portion can be achieved. The possibility of causing it can be eliminated.

  According to the seismic isolation device 1, the rigid material layer 5 includes a plurality of lower rigid steel plates 23 and 24 arranged side by side in the vertical direction V, and the lower portion of the lower rigid steel plates 23 and 24. Since the lower rigid steel plate 23 as the lowermost rigid material layer disposed closest to the flange plate 3 is formed to be longer in the horizontal direction H than the lower rigid steel plate 24, the laminated rubber body 7 is less likely to be plastically deformed in the plurality of lower rigid steel plates 23 and 24, thereby stabilizing the rigidity in the horizontal direction H and causing buckling or the like based on stress concentration in the fillet portion. The fear of causing it to disappear.

  In addition, the rigid material layer 5 of the seismic isolation device 1 is arranged side by side in the vertical direction V as shown in FIG. 6, for example, instead of the lower rigid steel plates 23 and 24, and in the horizontal direction H, respectively. The lower rigid steel plates 53 and 54 may be provided as a plurality of lower rigid material layers having equal lengths. Further, similarly to the above, the rigid material layer 5 is arranged in parallel with each other in the vertical direction V and has the same length in the horizontal direction H instead of the upper rigid steel plates 21 and 22. The upper rigid material layer (not shown) may be provided.

  The upper rigid steel plates 21 and 22 and the lower rigid steel plates 23 and 24 have circular outer peripheral edges 31, 32, 33, and 34, respectively, but instead, for example, as shown in FIG. You may have the polygonal outer periphery 55 located in the horizontal direction outer side rather than the outer periphery 16 of the rigid steel plate 25. FIG. The outer peripheral edge 16 may be a circular outer peripheral edge as described above, or may be a polygonal outer peripheral edge. In this case, the covering layer 6 may have a polygonal cylindrical shape.

  The seismic isolation device 1 includes the vibration energy absorber 9 in this example, but this configuration may be omitted. In this case, each of the rubber elastic material layer 4 and the rigid material layer 5 is formed in a disk shape. The laminated rubber body 7 may be formed in a columnar shape.

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Upper flange plate 3 Lower flange plate 4 Rubber elastic material layer 5 Rigid material layer 6 Cover layer 7 Laminated rubber body 9 Vibration energy absorber 21, 22 Upper rigid steel plate 23, 24, 53, 54 Lower rigid steel plate 25 , 26, 27, 28 Rigid steel plate in the middle part

Claims (8)

An upper flange plate connected to the upper structure, a lower flange plate connected to the lower structure, and a plurality of rubber elastic materials provided between the upper flange plate and the lower flange plate and stacked alternately in the vertical direction And a laminated rubber body having a plurality of rigid material layers, and the uppermost rubber elastic material layer of the plurality of rubber elastic material layers is vulcanized and bonded to the upper flange plate. The rubber elastic material layer at the bottom of the rubber elastic material layer is vulcanized and bonded to the lower flange plate, and the rigid material layer includes a plurality of upper rigid material layers disposed close to the upper flange plate, and a lower portion. a plurality of lower rigid material layer juxtaposed the flange plates, respectively arranged side by side in the vertical direction between the plurality of upper rigid material layers and a plurality of lower rigid material layer And and a plurality of intermediate portions rigid material layer, each of the plurality of upper rigid material layers and a plurality of lower rigid material layer, the top and bottom of the plurality of intermediate portions rigid material layer adjacent to the people the husband It is formed to be long in the horizontal direction with respect to the adjacent intermediate rigid material layer, and the upper and lower adjacent intermediate rigid material layers are sandwiched between the upper and lower adjacent intermediate rigid material layers in the vertical direction. against a plurality of intermediate portions rigid material layer more central side intermediate portion rigid material layer of, are made form such that the same length in the horizontal direction, each of the plurality of upper rigid material layer, vertical The plurality of lower rigid material layers are arranged side by side in the vertical direction and equal to each other in the horizontal direction. Seismic isolation devices have had lengths. The laminated rubber body is vulcanized and bonded to the outer peripheral edge of the plurality of rigid material layers on the inner peripheral surface and to the upper flange plate and the lower flange plate on the upper surface and the lower surface, respectively, and on the inner peripheral surface, a plurality of rubber elastic materials A cylindrical covering layer integrated with the layer, and a covering portion covering each of the plurality of upper rigid material layers and the plurality of lower rigid material layers of the covering layer is provided on the covering layer. The seismic isolation device according to claim 1, wherein the seismic isolation device projects in a horizontal direction with respect to the covering portion covering the plurality of intermediate rigid material layers. Each of the plurality of upper rigid material layers and the plurality of lower rigid material layers is horizontally outward from the circular outer peripheral edge of each of the upper and lower adjacent intermediate rigid material layers and the plurality of middle intermediate rigid material layers. The seismic isolation device according to claim 1, wherein the seismic isolation device has a circular outer peripheral edge. The circular outer peripheries of the plurality of upper rigid material layers and the plurality of lower rigid material layers are larger in diameter than the respective circular outer peripheral edges of the upper and lower adjacent intermediate rigid material layers and the plurality of middle intermediate rigid material layers. The seismic isolation device according to claim 3. Each of the plurality of upper rigid material layers, the plurality of lower rigid material layers, the upper adjacent intermediate rigid material layer, the lower adjacent intermediate rigid material layer, and the plurality of central rigid material layers has the same axis. The seismic isolation device according to claim 1. 2. Each of the plurality of upper rigid material layers and the plurality of lower rigid material layers has a polygonal outer peripheral edge located horizontally outward from the outer peripheral edges of the plurality of intermediate rigid material layers. Or the seismic isolation apparatus of 2. The seismic isolation system according to any one of claims 1 to 6, further comprising at least one columnar hole provided in the laminated rubber body, and a vibration energy absorber disposed in the at least one columnar hole. apparatus. The seismic isolation device according to claim 7, wherein the vibration energy absorber has a cylindrical shape.

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