JP2019127998A - Base isolation support device - Google Patents

Abstract

To provide a base isolation support device capable of maintaining holdability for one end and the other end of a vibration damping body in a lamination direction and preventing fatigue in a boundary region between the one end and the other end in the lamination direction, and an intermediate part of the vibration damping body between the one end and the other end in the lamination direction, thereby preventing deterioration of earthquake energy attenuation capability.SOLUTION: A base isolation support device 1 includes a laminate 7 having elastic layers 2 and rigid layers 3 which are alternately laminated, and a lead plug 17 disposed in a hollow part 14 extending from an undersurface 12 of an upper attaching plate 10 to a top face 13 of a lower attaching plate 11 in a lamination direction V.SELECTED DRAWING: Figure 1

Description

  The present invention is a device disposed between two structures for absorbing the energy of relative horizontal vibration between the two structures and for reducing the vibration acceleration input to the structures, in particular for damping seismic energy The present invention relates to a seismic isolation support device that reduces earthquake input acceleration and prevents damage to structures such as buildings and bridges.

  A laminate comprising an elastic layer and a rigid layer alternately stacked and a hollow portion defined by the elastic layer and the inner circumferential surface of the rigid layer, and a lead plug disposed in the hollow portion of the laminate Vibration support devices are known.

  Such a seismic isolation support apparatus supports the vertical load of the structure provided on one end side of the stack in the stacking direction by the stack and the lead plug and for the other end of the stack in the stacking direction caused by the earthquake. Vibration of the structure in the horizontal direction is damped by plastic deformation (shear deformation) of the lead plug accompanied by shear elastic deformation of the laminate, while horizontal vibration of the other end of the laminate in the stacking direction also caused by earthquakes The transmission to the structure is suppressed by the shear elastic deformation of the laminate accompanied by the plastic deformation of the lead plug.

JP, 2009-8181, A

  By the way, the lead plug of this type of seismic isolation support device has a rigid layer at one end and the other end in the stacking direction at the one end and the other end in the stacking direction, or an inner peripheral surface of the one end mounting plate and the other end mounting plate. The one end and the other end in the stacking direction of the held lead plugs are arranged in the hollow portion defined by the above and are held by the rigid layer or the one end mounting plate and the other end mounting plate at the one end and the other end. When the length of each part in the stacking direction is perpendicular to the stacking direction at the one end and the other end and is shorter than the diameter in the shear deformation direction of the middle part in seismic isolation, the lead Retention at one end and the other end of the plug in the stacking direction is reduced, and the structure in the stacking direction in the horizontal vibration of the structure with respect to the other end of the stack in the stacking direction caused by one earthquake Plastic deformation (shear deformation) in the middle of the lead plug between the one end and the other end When the length is long, one end and the other end in the stacking direction of the lead plug are firmly held, but the one end and the other end are sufficient. Flowability of the lead reduces fatigue and causes fatigue in the boundary area between the one end and the other end and the middle part of the lead plug, which may reduce the seismic energy attenuation capability as in the case of a short length. Occurs.

  Such problems occur notably in lead plugs, but not only in lead plugs but also in vibration damping bodies made of damping materials such as lead, tin or lead-free low melting point alloys that absorb vibration energy by plastic deformation. obtain.

  The present invention has been made in view of the above-mentioned various points, and the object of the present invention is to maintain the retention of one end and the other end of the vibration damping body in the stacking direction, while the one end in the stacking direction Fatigue in the boundary region between the other end and the middle part of the vibration damping body between the one end and the other end in the stacking direction can be avoided, and a drop in seismic energy attenuation ability can be avoided. The object is to provide a seismic isolation support device.

  A seismic isolation support device according to the present invention includes a laminate having a plurality of alternately laminated elastic layers and rigid layers, and one end mounting plate and the other end attached to one end surface and the other end surface of the laminate in the stacking direction. A vibration damping body disposed in a hollow portion surrounded by an elastic layer, a rigid layer, one end mounting plate and the other end mounting plate and extending in the stacking direction, and the one end mounting plate In addition, the load in the stacking direction toward the other end mounting plate is supported by the stacked body and the vibration damping body. The vibration damping body is a rigid layer at one end in the stacking direction of the stacked body or the inner periphery of the one end mounting plate. One end portion disposed at one end in the stacking direction of the hollow portion defined by the surface, and the stacking direction of the hollow portion defined by the rigid layer at the other end in the stacking direction of the laminate or the inner peripheral surface of the other end mounting plate The other end disposed at the other end, the one end in the stacking direction, and the other And an intermediate portion disposed in the hollow portion between the portions, and from the one end in the lamination direction of the intermediate portion, the length h1 in the lamination direction of one end of the vibration damping body and the other end in the lamination direction of the intermediate portion Length d2 of the other end of the vibration damping body in the stacking direction and the diameters d1 and d2 of the one end and the other end in the shear deformation direction of the intermediate portion in the direction orthogonal to the stacking direction Each of the ratio h1 / d1 and the ratio h2 / d2 is in the range of 0.05 to 0.7.

  In the present invention, the length h1 in the stacking direction of one end of the vibration damping body and the length h2 in the stacking direction of the other end of the vibration damping body are directions orthogonal to the stacking direction of the one end and the other end Since each of the ratios h1 / d1 and ratio h2 / d2 to the diameters d1 and d2 in the shear deformation direction of the intermediate part in the seismic isolation is 0.05 or more, one end and the other end of the vibration damping body in the stacking direction However, since each of the ratio h1 / d1 and ratio h2 / d2 is 0.7 or less, the one end and the other end of the hollow portion in the shear deformation of the intermediate portion in seismic isolation As a result of securing the fluidity of the vibration attenuating body to the hollow portion between the one end and the other end, it is possible to avoid the fatigue of the vibration attenuating body in the boundary region, and thus, it is possible to avoid a decrease in the seismic energy attenuation capacity. A seismic isolation support device can be provided.

  The seismic isolation support device according to the present invention preferably attenuates vibration in a direction perpendicular to the stacking direction of the one end mounting plate with respect to the other end mounting plate by plastic deformation of the vibration damping body accompanying shear elastic deformation of the stack. At the same time, transmission of vibration in the direction perpendicular to the stacking direction of the other end mounting plate to the one end mounting plate is suppressed by shear elastic deformation of the laminate accompanied by plastic deformation of the vibration damping body, and in the present invention The vibration damping body is, in a preferred example, disposed in the hollow portion without a gap with respect to the elastic layer and the rigid layer and the one end attachment plate and the other end attachment plate.

  In the present invention, in a preferred example where the decrease in seismic energy attenuation ability due to fatigue in the boundary region can be further avoided, each of the ratio h1 / d1 and the ratio h2 / d2 is 0.5 or less.

  If each of the ratio h1 / d1 and the ratio h2 / d2 is too small, the shear deformation of the middle part in the seismic isolation may not be able to firmly hold one end and the other end in the stacking direction of the vibration damping body. In the present invention, the ratio is 0.05 or more, but in a preferred example, each of the ratio h1 / d1 and the ratio h2 / d2 is 0.25 or more.

  In the present invention, the vibration damping body is, in a preferred example, made of a damping material that absorbs vibrational energy by plastic deformation, and such damping material is lead, tin or a lead-free low melting point alloy (eg tin-zinc based alloy) A tin-bismuth alloy and a tin-indium alloy, specifically, a tin-bismuth alloy containing 42 to 43 wt% of tin and 57 to 58 wt% of bismuth). It may be

  In the present invention, with respect to the rigid layer at one end in the stacking direction and the one end attachment plate, in a preferred example, the rigid layer at one end in the stacking direction is defined by the inner circumferential surface and one end of the vibration damping body is disposed. A through hole is provided, and the through hole has a length equal to the length h1 in the stacking direction of one end of the vibration damping body and a direction perpendicular to the stacking direction in the one end and the middle portion in seismic isolation And a diameter equal to the diameter d1 in the shear deformation direction of

  In the present invention, regarding the rigid layer at the other end in the stacking direction and the other end attachment plate, in a preferred example, the rigid layer at the other end in the stacking direction is defined by the inner circumferential surface and the other end of the vibration damping body The through hole has a length equal to the length h2 of the other end of the vibration damping body in the stacking direction and a direction perpendicular to the stacking direction at the other end. Thus, it has a diameter equal to the diameter d2 in the shear deformation direction of the intermediate part in the seismic isolation.

  In the present invention, examples of the material of the elastic layer include natural rubber, silicone rubber, high damping rubber, urethane rubber, chloroprene rubber and the like, preferably natural rubber, and each layer of the elastic layer is preferably Although it has a thickness of about 1 mm to 30 mm in a no-load state (a state in which the load in the stacking direction to be supported is not applied to the one end mounting plate), the present invention is not limited thereto. Examples thereof include steel plates, fiber-reinforced synthetic resin plates such as carbon fibers, glass fibers, or aramid fibers or fiber-reinforced hard rubber plates, etc. Even if each layer of the rigid layer has a thickness of about 1 mm to 6 mm, The rigid layer at one end and the other end is thicker than the thickness of the rigid layer between the rigid layers at one end and the other end in the stacking direction, for example, about 1 mm to 6 mm, for example, 10 mm to 50 m The elastic layer and the rigid layer are not particularly limited in the number of sheets, but the load, shear deformation amount (horizontal direction) of the structure to be supported. The number of elastic layers and rigid layers may be determined in order to obtain stable seismic isolation characteristics from the viewpoint of the amount of strain), the elastic modulus of the elastic layer, and the predicted magnitude of vibration acceleration to the structure.

  Further, in the present invention, the elastic body and the rigid layer are toroidal bodies, and the vibration damping body is preferably a cylindrical body, but those having other shapes, for example, the elastic body and the rigid layer are elliptical annular bodies or In the case of a hollow rectangular body, the vibration damping body may be an elliptic cylinder or a rectangular body, and the hollow portion may be one, or alternatively, may have a plurality of hollow portions. The seismic isolation support device may be configured by arranging a vibration damping body in each of the plurality of hollow portions. Note that the ratio h1 / d1 and the ratio h2 / d2 do not have to be the same for one hollow part, the ratio h1 / d1 and the ratio h2 / d2 may be different from each other, For each, the ratio h1 / d1 and the ratio h2 / d2 do not have to be the same in the hollow part, and the ratio h1 / d1 and the ratio h2 / d2 may be different in the hollow part, respectively, The ratio h1 / d1 and the ratio h2 / d2 are preferably in the range of 0.05 to 0.7 as described above for each of the plurality of hollow portions, but the ratio h1 / d1 is preferably only for part of the plurality of hollow portions. d1 and the ratio h2 / d2 may be in the range of 0.05 to 0.7.

  According to the present invention, it is possible to maintain the holding property of the vibration damping body to one end and the other end in the stacking direction, and between the one end and the other end in the stacking direction and the one end and the other end in the stacking direction. It is possible to provide a seismic isolation support device capable of avoiding fatigue in the boundary region with the middle portion of the vibration damping body and thus avoiding the reduction in seismic energy damping capability.

FIG. 1 is a cross-sectional explanatory view taken along the line II in FIG. 2 of a specific example of a preferred embodiment of the present invention. FIG. 2 is a partially cutaway plan view of the specific example shown in FIG. FIG. 3 is a perspective view of the lead plug of the embodiment shown in FIG. FIG. 4 is an operation explanatory view of the specific example shown in FIG. FIG. 5 is an explanatory view of hysteresis characteristics of horizontal displacement and horizontal stress of the seismic isolation support device according to the present invention. FIG. 6 is an explanatory view of the test results of the relationship between the ratio h1 / d1 and the ratio h2 / d2 and the intercept load ratio.

  Hereinafter, the present invention and its embodiments will be described based on preferred specific examples shown in the drawings. The present invention is by no means limited to this specific example.

  The seismic isolation support device 1 of this example shown in FIGS. 1 to 3 has a cylindrical outer periphery of the elastic layer 2 and the rigid layer 3 in addition to the plurality of annular elastic layers 2 and the rigid layer 3 stacked alternately. A cylindrical laminated body 7 having a cylindrical covering layer 6 covering the surfaces 4 and 5, and an annular shape that is one end face and the other end face of the laminated body 7 in the laminating direction (which is also the vertical direction in this example). Disc-shaped upper mounting plate 10 and lower mounting plate 11 which are one end mounting plate and the other end mounting plate attached to the upper end surface 8 and the lower end surface 9; elastic layer 2 and rigid layer 3; From the circular lower surface 12 that is surrounded by the lower mounting plate 11 and is one surface of the upper mounting plate 10 in the stacking direction V to the disk-shaped upper surface 13 that is one surface of the lower mounting plate 11 in the stacking direction V In the hollow portion 14 extending in the stacking direction V, the inner peripheral surface 15 of the elastic layer 2 and the cylindrical inner peripheral surface of the rigid layer 3 As a vibration damping body made of a damping material which is disposed without gaps with respect to the lower surface 12 and the upper surface 13 and in a direction perpendicular to the stacking direction V, in this example, plastic deformation in the horizontal direction H And a plurality of bolts 18 and 19 for attaching the upper mounting plate 10 to the upper end surface 8 and the lower mounting plate 11 to the lower end surface 9, respectively.

  Each of the elastic layers 2 made of an annular rubber plate made of natural rubber and having a thickness t1 is a horizontal direction H in the annular upper surface 21 and the lower surface 22 which are the one side and the other side in the stacking direction V. One plane and the other plane in the stacking direction V of the rigid layer 3 facing the flat upper surface 21 and the lower surface 22 in parallel in the stacking direction V, respectively, and the flat lower surface 23 and the upper surface 24 parallel to the horizontal direction H, respectively. Each of the inner peripheral surfaces 15 of the elastic layer 2 is vulcanized and bonded, so that the lead plug 17 partially bites into the space between the rigid layers 3 in the stacking direction V. The cylindrical outer peripheral surface 25 of the lead plug 17 at the position of the elastic layer 2 is a convex surface that bulges in the horizontal direction H.

  In the plurality of rigid layers 3 disposed concentrically with each of the elastic layers 2, each of the uppermost end and the lowermost rigid layer 3 which is one end and the other end of the lamination direction V of the laminate 7 has a thickness in the lamination direction V Each of the rigid layers 3 made of annular identical steel plates having a thickness t2 and disposed between the uppermost rigid layer 3 and the lowermost rigid layer 3 in the stacking direction V has a thickness of the elastic layer 2 The uppermost rigid layer consists of annular identical steel plates of thickness t3 (t3 <t1 and t3 <t2) in the stacking direction V thinner than t1 and thickness t2 of the uppermost and lowermost rigid layers 3 3 is defined by the inner circumferential surface 16 and is opened by a through hole 28 in which a cylindrical upper end 27 which is one end of the stacking direction V of the lead plug 17 is disposed, and an annular upper surface 24 And provided on the upper surface 24 at equal intervals in the circumferential direction R around the through hole 28. A plurality of bottomed screw holes 29 are provided, and the lowermost rigid layer 3 is defined by the inner circumferential surface 16 and is a circle which is the other end in the stacking direction V of the lead plug 17 A plurality of holes provided in the lower surface 23 are formed at equal intervals in the circumferential direction R around the through-hole 32 and open through the through-hole 32 in which the columnar lower end portion 31 is disposed and the annular lower surface 23. And a screw hole 33 at the bottom.

  A cylindrical outer peripheral surface 35 that is about 5 mm thick in the horizontal direction H in the direction orthogonal to the laminating direction V, is made of the same natural rubber as the elastic layer 2 and also serves as an outer peripheral surface of the laminated body 7 and a laminated layer. The covering layer 6 having an annular upper end surface 36 and lower end surface 37 as one and other surfaces in the direction V is vulcanized and bonded to the outer peripheral surfaces 4 and 5 at the cylindrical inner peripheral surface 38.

  Thus, the flat upper end surface 8 parallel to the horizontal direction H includes the upper surface 24 and the upper end surface 36 of the uppermost rigid layer 3, and the lower end surface 9 which is also parallel to the horizontal direction H is The lower surface 23 and the lower end surface 37 of the rigid layer 3 at the lower end are provided.

  The upper mounting plate 10 is circular as one surface of the upper end portion 27 of the lead plug 17 in the stacking direction V and has a flat upper end surface 41 parallel to the horizontal direction H and the upper surface 24 of the uppermost rigid layer 3 and In addition to the flat lower surface 12 which is in contact with the upper end surface 8 consisting of the upper end surface 36 of the covering layer 6 and is parallel to the horizontal direction H, it is circular as the other surface in the stacking direction V and parallel to the horizontal direction H A flat upper surface 42, a plurality of recesses 43 that are open at the upper surface 42 and that are provided at equal intervals in the circumferential direction R around the through hole 28, and communicate with the recess 43. On the other hand, through-holes 44 that open at the lower surface 12 and are provided at equal intervals in the circumferential direction R around the through-holes 28 corresponding to the screw holes 29, cylindrical side surfaces 45, and side surfaces 45 in the horizontal direction H Circumferential direction around through hole 28 in the vicinity of The upper mounting plate 10 is inserted into each recess 43 and each through hole 44 and screwed into each screw hole 29. It is fixed to the uppermost rigid layer 3 by each bolt 18.

  The lower mounting plate 11 is circular as one surface of the lower end portion 31 of the lead plug 17 in the stacking direction V, and is a flat lower end surface 51 parallel to the horizontal direction H and the lower surface 23 of the lowermost rigid layer 3 In addition to the flat upper surface 13 that is in contact with the lower end surface 9 composed of the lower end surface 37 of the coating layer 6 and parallel to the horizontal direction H, it is a circle as the other surface in the stacking direction V and is parallel to the horizontal direction H. It communicates with a certain flat lower surface 52, a plurality of recesses 53 provided in the lower surface 52 at equal intervals in the circumferential direction R centered on the through hole 28, and the recesses 53. On the other hand, through-holes 54 that open at the top surface 13 and are provided at equal intervals in the circumferential direction R around the through-holes 28 corresponding to the screw holes 33, cylindrical side surfaces 55, and side surfaces 55 in the horizontal direction H Circumferential direction around through hole 28 in the vicinity of The lower mounting plate 11 is inserted into each recess 53 and each through hole 54 and screwed into each screw hole 33. Each bolt 19 fixes the lowermost rigid layer 3.

  The lead plug 17 disposed in the hollow portion 14 defined by the inner peripheral surface 15 of each elastic layer 2, the inner peripheral surface 16 of each rigid layer 3, the lower surface 12 and the upper surface 13 is the inner periphery of the uppermost rigid layer 3. At the other end of the hollow portion 14 defined by the upper end portion 27 disposed at one end of the hollow portion 14 defined by the surface 16 in the stacking direction V and the inner circumferential surface 16 of the lowermost rigid layer 3 In addition to the disposed lower end 31, the intermediate portion 61 disposed in the hollow portion 14 between the upper end portion 27 and the lower end portion 31 in the stacking direction V is provided. The inner peripheral surface 15 of the plurality of elastic layers 2 between the uppermost end and the lowermost end rigid layer 3 and the inner peripheral surface 16 of the plurality of rigid layers 3 are defined, and one end to the upper end surface of the middle portion 61 in the stacking direction V Length h1 of the stacking direction V of the upper end portion 27 of the lead plug 17 up to 41 (stacking direction V of the uppermost rigid layer 3 The thickness h2 of the lower end portion 31 of the lead plug 17 from the other end of the middle portion 61 to the lower end face 51 from the other end in the stacking direction V of the intermediate portion 61 and the length h2 of the lowermost end rigid layer 3 The shear deformation direction of the intermediate portion 61 in the seismic isolation shown in FIG. 4 which is equal to the thickness t2 and therefore in the present example is h1 = h2) and perpendicular to the stacking direction V, in the present example the horizontal direction The diameters d1 and d2 of the upper end portion 27 and the lower end portion 31 of H (in this example, the diameters of the upper end surface 41 and the lower end surface 51, and d1 = d2), and the diameter of the inner circumferential surface 16 Each of the ratio h1 / d1 and ratio h2 / d2 to the same as d3 (that is, d1 = d2 = d3) is in the range of 0.05 to 0.7, 0.5 in this example.

  The lead plug 17 made by press-fitting and filling lead, which is a damping material that absorbs vibrational energy by plastic deformation, into the hollow portion 14 is a load in the stacking direction V from the upper structure 65 (see FIG. 4). In this example, the downward force in the stacking direction V, that is, even when the vertical load W is not applied to the upper mounting plate 10 (under no load), relative to the inner circumferential surface 15 and 16 and the lower surface 12 and the upper surface 13 The elastic layer 2 is disposed in a horizontal direction (shearing direction) H toward the elastic layer 2 against the elastic force of the elastic layer 2 and partially bites into the elastic layer 2. As a result of making the circumferential surface 15 concave, the inner circumferential surface 66 of the laminate 7 consisting of the inner circumferential surfaces 15 and 16 is concave at the position of the inner circumferential surface 15 of the elastic layer 2, while the rigidity of the uppermost end Inner circumferential surface 1 of the rigid layer 3 disposed between the layer 3 and the lowermost rigid layer 3 When the vertical load W in the stacking direction V from the upper structure 65 to be supported is applied to the upper mounting plate 10 (under load), the elastic layer 2 is compressed in the stacking direction V. As a result, the thickness t1 of the elastic layer 2 becomes smaller than the thickness t1 under no load, and as a result, the height h of the laminate 7 and, consequently, the height of the seismic isolation support device 1 is reduced. The lead plug 17 which has been pressed and filled against the elastic force of the elastic layer 2 is stretched in the horizontal direction H by the elastic deformation of the elastic layer 2 and bites into the elastic layer 2 and the inner peripheral surface 15 of the elastic layer 2 Make it a concave surface greatly recessed in the horizontal direction H.

  As shown in FIG. 4, the above-described seismic isolation support device 1 is adapted to support the vertical load W in the stacking direction V toward the lower mounting plate 11 while being applied to the upper mounting plate 10 by the laminated body 7 and the lead plug 17. The upper mounting plate 10 is inserted into the through hole 46 via the anchor bolt 71. The lower mounting plate 11 is inserted through the through hole 56 via the anchor bolt 72. The vertical load W of the stacking direction V applied to the upper mounting plate 10 is supported by the laminate 7 and the lead plug 17 by receiving the vertical load W of the structure 65 fixed to the structure 73 and arranged between the structures 65 and 73 respectively. At the same time, during an earthquake, as shown in FIG. 4, while the transmission to the upper attachment plate 10 of the vibration of the lower attachment plate 11 in the horizontal direction H is suppressed by the shear elastic deformation of the laminate 7 in the horizontal direction H, the lower attachment plate 11 Against the horizontal direction H of the upper mounting plate 10 And it is adapted to damp vibrations by plastic deformation in the horizontal direction H of the lead plug 17.

  When manufacturing the seismic isolation support device 1, first, the inner peripheral surface before being deformed into a concave surface having an annular thickness t <b> 1 to be the elastic layer 2 and the same diameter as the diameter d <b> 3 of the inner peripheral surface 16. A plurality of rubber plates having a number 15 and a plurality of steel plates having an annular surface thickness t3 and an inner circumferential surface 16 of a diameter d3 which becomes the rigid layer 3 between the uppermost and lowermost rigid layers 3 are alternately arranged. Place a steel plate with an annular surface thickness t2 and an inner circumferential surface 16 of diameter d1 = d2 (= d3 ≧ t2) that will become the top and bottom rigid layers 3 on the bottom and top The laminate 7 is formed by fixing them together by vulcanization adhesion under pressure in the mold, and then the lower mounting plate 11 is fixed to the lowermost rigid layer 3 via bolts 19. Next, lead is pressed into the hollow portion 14 in order to form the lead plug 17 in the hollow portion 14. The lead is pressed into the hollow portion 14 with a hydraulic ram or the like so that the lead plug 17 is restrained without gaps in the hollow portion 14 by the laminate 7, and after the lead is pressed in, the bolt 18 is used. The upper mounting plate 10 is fixed to the uppermost rigid layer 3. In the formation of the laminate 7 by vulcanization bonding under pressure in the mold, the outer peripheral surfaces 4 and 5 are covered with the outer peripheral surfaces 4 and 5 to cover the outer peripheral surfaces 4 and 5 of the elastic layer 2 and the rigid layer 3. The coating layer 6 may be formed by vulcanization bonding on the outer peripheral surfaces 4 and 5 of the elastic layer 2 and the rigid layer 3 simultaneously with the brazing and the vulcanization bonding. Further, in such formation, a part of the inner peripheral side of the rubber plate to be the elastic layer 2 flows to form the rigid layer 3 between the inner peripheral surface 16 of the rigid layer 3, preferably the uppermost and lowermost rigid layers 3. The covering layer may be formed to be sufficiently thinner than the thickness of the covering layer 6 so as to cover the inner circumferential surface 16 of the

  Note that the inner circumferential surface 15 of the elastic layer 2 does not necessarily have to be concavely deformed with no load (W = 0) depending on the amount of press-fitting of lead into the hollow portion 14.

  In the seismic isolation support device 1 manufactured in this way, since the ratios h1 (= t2) / d1 and h2 (= t2) / d2 are each 0.05 or more, the horizontal direction H of the intermediate portion 61 in the seismic isolation In the stacking direction V, the retainability of the lead plug 17 with respect to the upper end portion 27 and the lower end portion 31 can be maintained, while each of the ratios h1 (= t2) / d1 and h2 (= t2) / d2 is 0. 7 or less, the plastic flow of the lead plug 17 from one end and the other end in the stacking direction V of the hollow portion 14 to the hollow portion 14 between the one end and the other end, in other words, from the intermediate portion 61 to the upper end portion 27. And the plastic flow from the upper end 27 and the lower end 31 to the middle part 61 to the lower end 31 and the boundary region between the upper end 27 and the lower end 31 of the lead plug 17 and the middle part 61 of the lead plug 17 Flow of the lead plug 17 in the So, it can avoid the immobilization of lead plugs 17 in the boundary area can reduce the fatigue of the lead plug 17 in the boundary area, Thus, it is possible to avoid the deterioration of the seismic energy damping capacity.

In order to confirm that the decrease in seismic energy attenuation capability can be avoided, the following three seismic isolation support devices corresponding to the seismic isolation support device 1 were manufactured.
Common matter for three seismic isolation support devices Elastic layer 2: Thickness t1 = 5 mm, outer peripheral surface 4 = 120 mm square, outer peripheral surface 35 = 130 mm square, diameter of cylindrical inner peripheral surface 15 before deformation ( Inner diameter) = 30 mmφ, and using five annular rubber plates made of natural rubber with shear modulus = 1.0 (N / mm ² ).
Uppermost and lowermost rigid layers 3: Steel plates of thickness t2 = 22 mm, outer peripheral surface 5 = 120 mm square, diameters d1 and d2 = 30 mmφ of inner peripheral surface 16 are used.
Rigid layer 3 between the uppermost and lowermost rigid layers 3: thickness t3 = 3.2 mm, outer peripheral surface 5 = 120 mm square, diameter of inner peripheral surface 16 (inner diameter) = d1 = d2 = 30 mmφ four steel plates use.
Covering layer 6 thickness = 5 mm
Lead plug 17: The hollow portion 14 was filled with lead that is one time the volume of the hollow portion 14 in a state in which the vertical load W is not applied to the laminate 7.

With the above in common, with three seismic isolation support devices,
In the first seismic isolation support device,
h1 / d1 = h2 / d2 = 0.3
In the second seismic isolation support device,
h1 / d1 = h2 / d2 = 0.7
In the third seismic isolation support device,
h1 / d1 = h2 / d2 = 0.1
And

  In order to obtain such a ratio h1 / d1 and a ratio h2 / d2 in the seismic isolation supporting device, in the through holes 28 and 32, between the upper end surface 41 and the lower surface 12 and between the lower end surface 51 and the upper surface 13 H1 and h2 were changed with a spacer having a predetermined thickness interposed therebetween.

In the first, second and third seismic isolation support devices, the vertical mounting load 10 is applied to the lower mounting plate 11 with respect to the upper mounting plate 10 with a maximum horizontal displacement of ± 25 mm in a state where a vertical load W = 82 kN is applied to the upper mounting plate 10. With respect to the intercept load Qd in the hysteresis curve 81 of the horizontal displacement and the horizontal force shown in FIG. 5 by applying 500 repetitions of a sine wave having a maximum speed of 1.7 mm / s in the horizontal direction H at a period of 90 seconds, The ratio (intercept load ratio) = Qd ₄₅₀ / Qd ₃ between the value Qd ₃ at the third repetitive vibration and the value Qd ₄₅₀ at the _450th repetitive vibration was determined. As is clear from FIG. 6, Qd ₄₅₀ / Qd ₃ = 0.78 in the first seismic isolation support device, Qd ₄₅₀ / Qd ₃ = 0.91 in the second seismic isolation support device, and third In the seismic isolation support device of Qd ₄₅₀ / Qd ₃ = 0.73.

The ratio h1 / d1 and the ratio h2 / d2 shown in FIG. 6, the ratio of the intercept load value _{Qd 450} of when 450-th repetition oscillation of relative sections load Qd ₃ of when repeated vibrations the third (intercept load ratio) _{= Qd 450} / from the test results of the relationship between qd _3, maximum specific _Qd 450 _{/ Qd} 3 = 0.92 becomes the ratio h1 / d1 and the ratio h2 / d2 is 0.4 vicinity, the ratio h1 / d1 and the ratio h2 / d2 is 0 If the ratio is less than .05 or exceeds 0.7, the ratio Qd ₄₅₀ / Qd ₃ becomes approximately 0.7 or less. Therefore, the reduction in the seismic energy attenuation capability represented by the area surrounded by the hysteresis curve 81 is If the ratio h1 / d1 and the ratio h2 / d2 are in the range of 0.05 to 0.7, the ratio h1 / d1 and the ratio h2 / d2 are less than 0.05 or less than 0.7. When it exceeds, it becomes remarkable, and, When h1 / d1 and the ratio h2 / d2 is in the range of 0.05 to 0.7, the reduction of seismic energy damping capability can preferably avoided.

  In the seismic isolation support device 1 of the above example, the length h1 and the length h2 and the thickness t2 are equal to each other, but at least one of the length h1 and the length h2 is smaller than the thickness t2 ( In this case, a spacer such as a lid is fitted into the through hole corresponding to at least one of the length h1 and the length h2 smaller than the thickness t2 of the through holes 28 and 32. It is preferable to obtain a length (h1, h2) smaller (shorter) than the thickness t2, and in the seismic isolation support device 1 of the above example, the upper end 27 is the uppermost rigid layer 3. The lower end portion 31 is held in the horizontal direction H by the lowermost rigid layer 3 respectively, but instead the upper end rigid layer 3 and the lowermost rigid layer 3 are omitted, and the upper mounting plate 10 and the lower end are removed. Each of the mounting plates 11 is closed with a lid or the like and has diameters d1 and d2 in the horizontal direction H. And, through holes having lengths h1 and h2 in the stacking direction V are provided, lead is also pressed into and filled in each of the through holes, and the upper end 27 and the lower end 31 are respectively inserted in the respective through holes. The lead plug 17 is formed at the lower end of the hollow portion defined by the inner circumferential surface of the upper mounting plate 10, the upper end portion 27 disposed in the through hole of diameter d1 and length h1 being one end in the stacking direction V; A lower end portion 31 disposed in the through hole having a diameter d2 and a length h2 which is the other end of the hollow portion defined in the inner circumferential surface of the mounting plate 11 in the laminating direction, and the upper end 27 and the lower end in the laminating direction V The intermediate portion 61 disposed in the hollow portion between the portions 31 may be configured, and in this case, each of the elastic layers 2 disposed at the uppermost end and the lowermost end in the stacking direction V may be used as the upper mounting plate 10 And the lower mounting plate 11 are vulcanized and bonded to each of the upper mounting plate 10 and the lower mounting plate 11. Each of the seismic isolation support devices 1 may be fixed, and if the ratio h1 / d1 and the ratio h2 / d2 are in the range of 0.05 to 0.7, the seismic isolation support device of the above example It can produce the same effect as 1.

DESCRIPTION OF SYMBOLS 1 Seismic isolation support apparatus 2 elastic layer 3 rigid layer 4, 5 outer peripheral surface 6 coating layer 7 laminated body 8 upper end surface 9 lower end surface 10 upper attachment plate 11 lower attachment plate 12 lower surface 13 upper surface 14 hollow part 15, 16 inner peripheral surface 17 Lead plug

Claims (11)

  A laminate having a plurality of alternately laminated elastic layers and rigid layers, one end mounting plate and the other end mounting plate attached to one end surface and the other end surface of the laminate in the stacking direction, an elastic layer and a rigid layer, and A vibration damping body that is surrounded by the one end mounting plate and the other end mounting plate and that is disposed in a hollow portion extending in the stacking direction, and is laminated to the one end mounting plate and toward the other end mounting plate The seismic isolation support device is configured to support the load in the direction by the laminated body and the vibration damping body, and the vibration damping body is a rigid layer at one end in the stacking direction of the laminated body or an inner peripheral surface of the one end mounting plate. The other end in the stacking direction of the hollow portion defined by one end disposed at one end in the stacking direction of the defined hollow portion and the rigid layer at the other end in the stacking direction of the laminate or the inner peripheral surface of the other end mounting plate Between the other end disposed on the side and the one end and the other end in the stacking direction And an intermediate portion disposed in the hollow portion, the length h1 of the end portion of the vibration damping body from the one end in the laminating direction of the intermediate portion and the vibration damping from the other end in the laminating direction of the intermediate portion The length h2 of the other end of the body in the stacking direction and the ratio h1 of the diameters d1 and d2 of the one end and the other end of the shear deformation direction of the intermediate part in the direction perpendicular to the stacking direction The base isolation support apparatus in which each of / d1 and ratio h2 / d2 is in the range of 0.05 to 0.7.   The seismic isolation supporting device according to claim 1, wherein the vibration damping body is disposed in the hollow portion without a gap with respect to the elastic layer and the rigid layer and the one end attachment plate and the other end attachment plate.   The vibration in the direction orthogonal to the stacking direction of the one end mounting plate with respect to the other end mounting plate is attenuated by the plastic deformation of the vibration damping body and the vibration in the direction orthogonal to the stacking direction of the other end mounting plate is transmitted to the one end mounting plate. The seismic isolation support device according to claim 1 or 2, wherein transmission is suppressed by shear elastic deformation of the laminate.   The seismic isolation support device according to any one of claims 1 to 3, wherein each of the ratio h1 / d1 and the ratio h2 / d2 is 0.5 or less.   The seismic isolation support device according to any one of claims 1 to 4, wherein each of the ratio h1 / d1 and the ratio h2 / d2 is 0.25 or more.   The seismic isolation support device according to any one of claims 1 to 5, wherein the vibration damping body is made of a damping material that absorbs vibration energy by plastic deformation.   The seismic isolation supporting device according to claim 6, wherein the damping material is made of lead, tin or a lead-free low melting point alloy.   The vibration isolation support according to any one of claims 1 to 7, wherein the vibration damping body bites into the elastic layer and the inner peripheral surface of the laminate defining the hollow portion is concave at the position of the elastic layer. apparatus.   The vibration isolation support device according to any one of claims 1 to 8, wherein the vibration damping body bites into the elastic layer and the inner peripheral surface of the laminate defining the hollow portion is convex at the position of the rigid layer. .   The rigid layer at one end in the laminating direction has a through hole that is defined by the inner peripheral surface and is provided with one end portion of the vibration damping body, and this through hole is a lamination of one end portion of the vibration damping body. The length is equal to the length h1 of the direction, and the diameter is equal to the diameter d1 of the shear deformation direction of the intermediate portion in the direction perpendicular to the stacking direction at the one end and in the seismic isolation. The base isolation support apparatus of any one of the above.   The rigid layer at the other end in the stacking direction is provided with a through hole which is defined by the inner circumferential surface and in which the other end of the vibration damping body is disposed, and this through hole is the other end of the vibration damping body It has a length equal to the length h2 of the stacking direction of the part and a diameter equal to the diameter d2 of the intermediate part in the shear deformation direction in the direction perpendicular to the stacking direction at the other end. The seismic isolation support apparatus of claim 10.

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