JP2018013172A - Seismic isolation support device - Google Patents

Abstract

A vibration damping body disposed in a hollow portion of a laminated body can be constrained without a predetermined gap, so that stable seismic isolation characteristics can be obtained, and in addition, fatigue of the elastic layer of the laminated body and the vibration damping body. To provide a seismic isolation support device that can avoid damage and that is particularly excellent in durability, seismic isolation effect, and manufacturability.
A seismic isolation support device (1) is attached to a laminated body (7) having alternately laminated elastic layers (2) and rigid layers (3), and an annular upper end surface (8) and lower end surface (9) in the lamination direction (V). The upper plate 10 and the lower plate 11, the elastic layer 2 and the rigid layer 3, and the upper plate 10 and the lower plate 11 are surrounded by the upper plate 10 and the lower plate 12 to the upper surface 13 of the lower plate 11 in the stacking direction V. And a lead plug 17 disposed in the elongated hollow portion 14.
[Selection] Figure 1

Description

  The present invention is an apparatus for reducing the vibration acceleration to a structure, particularly for a seismic energy attenuation, which is arranged between two structures to absorb the energy of relative horizontal vibration between the two structures. The present invention relates to a seismic isolation support device that reduces input acceleration and prevents damage to structures such as buildings and bridges.

  An elastic layer and a rigid layer laminated alternately, a laminate having a hollow portion defined by the inner peripheral surfaces of the elastic layer and the rigid layer, and a lead plug disposed in the hollow portion of the laminate. Seismic support devices are known.

  Such a seismic isolation support device supports the vertical load of the structure with the laminated body and the lead plug and also causes the horizontal vibration of the structure against one end in the laminating direction of the laminated body due to the earthquake to generate plasticity of the lead plug. While it is damped by deformation (shear deformation), the transmission of horizontal vibration at one end of the stack in the stacking direction due to an earthquake to the structure is suppressed by elastic deformation (shear deformation) of the stack. Yes.

JP 2009-8181 A

  By the way, in this type of seismic isolation support device, lead is press-fitted and filled into the hollow portion of the laminated body to obtain a lead plug, but is press-fitted and filled so as to be surrounded by the inner peripheral surface of the rigid layer and the elastic layer of the laminated body. The lead plug thus pressed is partially pushed back by the elasticity of the elastic layer, and this pushback generates an internal pressure in the lead plug.

  If the generated internal pressure of the lead plug is not sufficient in relation to the rigidity of the elastic layer, in the seismic isolation operation of the seismic isolation support device, there is a gap between the outer peripheral surface of the lead plug and the inner peripheral surface of the rigid layer and the elastic layer. May occur, and vibration may not be effectively damped by the lead plug.

  Such a problem occurs remarkably in a lead plug, but is not limited to such a lead plug, and is a vibration damping body made of a damping material such as lead, tin, or a non-lead low melting point alloy that absorbs vibration energy by plastic deformation. But it can happen.

  The present invention was made in view of the above points, and as a result of being able to constrain the vibration damping body arranged in the hollow portion of the laminated body without a predetermined gap, stable seismic isolation characteristics can be obtained, In addition, it is an object of the present invention to provide a seismic isolation support device that can avoid fatigue and breakage of the elastic layer and vibration damping body of the laminate, and is particularly excellent in durability, seismic isolation effect, and manufacturability.

  A seismic isolation support device according to the present invention includes a laminated body having alternately laminated elastic layers and rigid layers, an upper plate and a lower plate attached to an upper end surface and a lower end surface of the laminated body, an elastic layer and a rigid layer, and A load in the laminating direction applied to the upper plate and having a vibration damping body surrounded by an upper plate and a lower plate and extending in a hollow portion extending in the laminating direction from the lower surface of the upper plate to the upper surface of the lower plate Is supported by the laminated body and the vibration damping body, and the surface pressure Pr from the vibration damping body to the upper plate based on the load in the lamination direction to be supported and the pressure receiving surface against the load of the laminated body based on the load. The vibration damping body is arranged in the hollow portion so that the ratio Pr / P0 with the surface pressure P0 is 1.00 or more (ratio Pr / P0 ≧ 1.00).

  The seismic isolation support device according to the present invention also includes a laminate having elastic layers and rigid layers alternately laminated, an upper plate and a lower plate attached to the upper end surface and the lower end surface of the laminate, an elastic layer, and rigidity. The hollow part that is surrounded by the layer and the upper and lower plates and extends in the stacking direction from the lower surface of the upper plate to the upper surface of the lower plate is arranged without any gap with respect to the elastic layer, the rigid layer, and the upper and lower plates. The load in the stacking direction applied to the upper plate is supported by the stack and the vibration damping body, and the vibration damping body is supported by the load in the stacking direction. Vibration so that the ratio Pr / P0 of the surface pressure Pr to the plate and the surface pressure P0 at the pressure-receiving surface with respect to the load of the laminate based on the load is 1.00 or more (ratio Pr / P0 ≧ 1.00). An attenuation body is arranged in the hollow part.

  The seismic isolation support device according to the present invention further includes a laminate having elastic layers and rigid layers alternately laminated, an upper plate and a lower plate attached to the upper end surface and the lower end surface of the laminate, an elastic layer, and A laminate that includes a rigid layer and a vibration damping body that is surrounded by a top plate and a bottom plate and that extends in a laminating direction from the bottom surface of the top plate to the top surface of the bottom plate and is applied to the top plate The load in the direction is supported by the laminated body and vibration damping body, and the vibration in the direction perpendicular to the lamination direction of the upper plate relative to the lower plate is attenuated by plastic deformation of the vibration damping body, while orthogonal to the lamination direction of the lower plate Transmission to the upper plate in the direction of vibration is suppressed by shear elastic deformation of the laminated body, and the surface pressure Pr from the vibration damping body to the upper plate based on the load in the laminated direction to be supported and the load Of surface pressure P0 at the pressure-receiving surface with respect to the load of the laminate As r / P0 is 1.00 or more (the ratio Pr / P0 ≧ 1.00), the vibration damping body is arranged in the hollow portion.

  In addition, the seismic isolation support device according to the present invention includes a laminate having elastic layers and rigid layers alternately laminated, an upper plate and a lower plate attached to the upper end surface and the lower end surface of the laminate, an elastic layer, and The hollow portion surrounded by the rigid layer and the upper and lower plates and extending in the stacking direction from the lower surface of the upper plate to the upper surface of the lower plate has no gap with respect to the elastic layer, the rigid layer, and the upper and lower plates. A vibration attenuating body disposed on the upper plate and supporting the load in the laminating direction applied to the upper plate by the laminated body and the vibration attenuating body, and generating vibration in a direction perpendicular to the laminating direction of the upper plate relative to the lower plate. While the vibration damping body is damped by plastic deformation, the transmission to the upper plate in the direction orthogonal to the lamination direction of the lower plate is suppressed by the shear elastic deformation of the laminate, and the load in the supporting lamination direction Surface pressure Pr from the vibration damping body to the upper plate and the load The vibration damping body is arranged in the hollow portion so that the ratio Pr / P0 to the surface pressure P0 at the pressure-receiving surface with respect to the load of the laminate based on is 1.00 or more (ratio Pr / P0 ≧ 1.00). Become.

  In the present invention, when the elastic layer is compressed in the stacking direction (vertical direction) by the load (vertical load) W applied to the upper plate from the supporting structure, the height of the hollow portion (length in the stacking direction) is reduced. The vibration attenuator presses the inner peripheral surface of the elastic layer and partially protrudes in the direction perpendicular to the laminating direction (horizontal direction, that is, the shearing direction) on the elastic layer. The internal pressure generated in the vibration attenuating body based on the elastic reaction force of the elastic layer due to the pressure on the inner peripheral surface of the layer and against the surface pressure Pr from the vibration attenuating body to the upper plate and the load of the laminate based on the load In the seismic isolation support device in which the vibration damping body is disposed in the hollow portion so that the ratio Pr / P0 with the surface pressure P0 at the pressure receiving surface is a constant relationship, the vibration damping body disposed in the hollow portion is set to a predetermined value. It was made based on the knowledge that it can be restrained without gaps. That.

  In the seismic isolation support device of the present invention based on such knowledge, the ratio Pr / P0 between the surface pressure Pr and the surface pressure P0 is 1.00 or more (ratio Pr / P0 ≧ 1.00), preferably 1.00. More preferably, it exceeds 1.09 (ratio Pr / P0 ≧ 1.09), and even more preferably, 2.02 or more (ratio Pr / P0 ≧ 2. 02), and most preferably, if the vibration attenuator is preferably densely arranged in the hollow portion so as to be 2.50 or more (ratio Pr / P0 ≧ 2.50), the direction perpendicular to the stacking direction Even in the shear elastic deformation of the laminated body, the vibration damping body arranged in the hollow portion can be restrained by the elastic layer, the rigid layer, the upper plate, and the lower plate without a predetermined gap, so that stable seismic isolation characteristics can be obtained. In addition, fatigue and damage of the elastic layer and vibration damping body can be avoided, and durability Fine seismic isolation effect as well as to provide a particularly good seismic isolation support device manufacturability.

  In the present invention, the surface pressure Pr from the vibration damping body to the upper plate depends on the magnitude of the load from the structure, the degree of filling of the vibration damping body into the hollow portion, and the elasticity or rigidity of the elastic layer. In the seismic isolation support apparatus in which the ratio Pr / P0 is 1.00 or more, the inner circumferential surface of the laminated body that defines the hollow portion has the vibration damping body appropriately bite into the elastic layer, and the position of the elastic layer Becomes an annular concave surface, and becomes an annular convex surface at the position of the rigid layer.

  By the way, in the seismic isolation support device in which the ratio Pr / P0 is smaller than 1.00, the elastic layer and the rigid layer which define the hollow portion, the upper plate and the lower plate, and the outer peripheral surface of the vibration damping body in contact therewith are provided. Unstable seismic isolation characteristics because gaps are easily generated, and therefore gaps are easily generated between the elastic and rigid layers, the upper and lower plates, and the outer peripheral surface of the vibration damping body during operation of the seismic isolation support device. Will be shown. This is presumably because the vibration attenuating body is not constrained to the laminate without any gap in at least the shearing direction (horizontal direction), and the vibration attenuating body undergoes deformation other than shear deformation.

  On the other hand, in the seismic isolation support device in which the ratio Pr / P0 is greater than a certain value, specifically, in the seismic isolation support device in which the ratio Pr / P0 is greater than 5.90, the vibration damping body greatly bites into the elastic layer, and the elastic layer The inner peripheral surface of the material becomes excessively concave, and the shear stress between the elastic layer and the rigid layer in the vicinity of this part becomes too large, which accelerates the deterioration of the elastic layer and deteriorates the durability of the elastic layer. Further, in order to obtain a seismic isolation support device having a ratio Pr / P0 larger than 5.90, it is necessary to make the press-fitting into the hollow portion of the vibration damping body extremely large. It also proved difficult.

  And the vibration damping body arranged in the hollow part can be restrained by the elastic layer and the rigid layer and the upper plate and the lower plate without a predetermined gap, and stable seismic isolation characteristics can be obtained. The ratio Pr / P0 that can avoid the fatigue and damage of the vibration attenuating body and can obtain a seismic isolation support device that is particularly excellent in durability, seismic isolation effect and manufacturability is the seismic isolation support device of the present invention. There is a preferable range for each load W on the building and bridge to be isolated from, but each of the isolation devices has a ratio Pr / P0 ≧ 1.00 and a ratio Pr / P0 ≦ 5.90. For example, a small vibration input can provide a high rigidity, and a large vibration input can provide a function exhibiting a low rigidity, that is, a so-called trigger function, and can cope with a large-amplitude earthquake motion particularly favorably. Is extremely excellent.

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

  In the present invention, with respect to the upper plate and the uppermost rigid layer in the stacking direction, in a preferred example, the upper plate includes an upper flange plate having an upper through hole, and an upper blocking member fixed to the upper flange plate in the upper through hole. The upper end surface of the vibration damping body in the stacking direction is in contact with the lower end surface of the upper closing plate in the stacking direction without a gap, and the outer peripheral surface of the upper end portion of the vibration damping body in the stacking direction is The upper flange plate defining the upper through hole is in contact with the inner peripheral surface without a gap. In another preferred example, the uppermost rigid layer in the stacking direction is open on the upper surface and in the stacking direction. The first recess has a diameter larger than the diameter of the upper portion of the hollow portion and communicates with the upper portion of the hollow portion, and the upper plate has an opening at the lower surface and a diameter of the first recess. With the same diameter in the stacking direction An upper flange plate having a second recess facing the recess, and the second recess is fitted to the upper flange plate, while the first recess is fitted to the uppermost rigid layer. The outer peripheral surface of the upper end portion of the vibration damping body in the stacking direction is in contact with the inner peripheral surface of the uppermost rigid layer defining the upper portion of the hollow portion without any gap. ing.

  In the present invention, regarding the lower plate and the lowermost rigid layer in the laminating direction, in a preferred example, the lower plate includes a lower flange plate having a lower through hole, and a lower blocking member fixed to the lower flange plate in the lower through hole. The lower end surface of the vibration damping body in the stacking direction is in contact with the upper end surface of the lower closing plate in the stacking direction without a gap, and the outer peripheral surface of the lower end portion of the vibration damping body in the stacking direction is , In contact with the inner peripheral surface of the lower flange plate defining the lower through-hole without a gap, and in another preferred example, the lowermost rigid layer in the stacking direction is open on the lower surface and in the stacking direction. It has a third recess communicating with the lower portion of the hollow portion with a diameter larger than the diameter of the lower portion of the hollow portion, and the lower plate is opened at the upper surface and has a diameter of the third recess. With the same diameter in the stacking direction A lower flange plate having a fourth recess facing the recess, and a lower flange plate fitted to the lower flange plate in the fourth recess, while being fitted to the lowermost rigid layer in the fourth recess. The outer peripheral surface of the lower end portion of the vibration damping body in the stacking direction is in contact with the inner peripheral surface of the lowermost rigid layer defining the lower portion of the hollow portion without a gap. ing.

  The upper flange plate and the lower flange plate may have a circular or oval outer edge, or may have a rectangular or rectangular outer edge instead.

  In the present invention, examples of the material for the elastic layer include natural rubber, silicon 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 an unloaded state (a state in which the load in the supporting stacking direction is not applied to the upper plate), it is not limited to this, and the material of the rigid layer is a steel plate , A fiber reinforced synthetic resin plate such as carbon fiber, glass fiber or aramid fiber, or a fiber reinforced hard rubber plate, etc., and each layer of the rigid layer may have a thickness of about 1 mm to 6 mm, The uppermost layer and the lowermost rigid layer may have a thickness of about 10 mm to 50 mm, but are not limited thereto, and in addition, the elastic layer and the rigid layer are not particularly limited in number. In order to obtain stable seismic isolation characteristics in terms of the load of the supporting structure, the amount of shear deformation (horizontal strain), the elastic modulus of the elastic layer, and the predicted magnitude of vibration acceleration to the structure. The number of elastic layers and rigid layers may be determined.

  In the present invention, the elastic body and the vibration damping body are preferably an annular body and a cylindrical body, but may have other shapes, for example, an ellipse or a rectangular body and an ellipse or a rectangular body. However, instead of this, the seismic isolation support device may have a plurality of hollow portions, and a vibration damping body is arranged in each of the plurality of hollow portions, and the seismic isolation support device. May be configured. Note that the ratio Pr / P0 does not have to be the same for each of the plurality of hollow portions, and the ratio Pr / P0 may be different, and the ratio Pr / P0 for each of the plurality of hollow portions is different. As described above, it is preferably 1.00 or more, but the ratio Pr / P0 may be 1.00 or more only for a part of the plurality of hollow portions.

  According to the present invention, the vibration damping body arranged in the hollow portion of the laminate can be constrained without a predetermined gap, so that stable seismic isolation characteristics can be obtained, and in addition, the elastic layer and vibration damping of the laminate can be obtained. It is possible to provide a seismic isolation support device that can avoid fatigue and damage of the body and that is particularly excellent in durability, seismic isolation effect, and manufacturability.

FIG. 1 is a cross-sectional explanatory view taken along the line II in FIG. 2 of an example of a preferred embodiment of the present invention. FIG. 2 is a partial cross-sectional plan view of the example shown in FIG. FIG. 3 is a partially enlarged cross-sectional explanatory view of the example shown in FIG. FIG. 4 is an explanatory diagram of test results of hysteresis characteristics of horizontal displacement and horizontal stress in the preferred embodiment 1 of the present invention. FIG. 5 is an explanatory diagram of test results of hysteresis characteristics of horizontal displacement and horizontal stress in the preferred embodiment 2 of the present invention. FIG. 6 is an explanatory diagram of test results of hysteresis characteristics of horizontal displacement and horizontal stress in the preferred embodiment 3 of the present invention. FIG. 7 is an explanatory diagram of test results of hysteresis characteristics of horizontal displacement and horizontal stress in the comparative example.

  Hereinafter, the present invention and its embodiments will be described based on preferred specific examples shown in the drawings. Note that the present invention is not limited to this specific example.

  The seismic isolation support device 1 of this example shown in FIGS. 1 to 3 includes a cylindrical outer peripheral surface 4 of the elastic layer 2 and the rigid layer 3 in addition to the plurality of elastic layers 2 and the rigid layer 3 that are alternately stacked. A cylindrical laminated body 7 having a cylindrical covering layer 6 covered with 5 and an annular upper end face 8 and lower end face 9 of the laminated body 7 in the laminating direction (which is also the vertical direction in this example) The upper plate 10 and the lower plate 11, the elastic layer 2 and the rigid layer 3, and the upper plate 10 and the lower plate 11 are surrounded by the upper plate 10 and the lower plate 12 to the upper surface 13 of the lower plate 11 in the stacking direction V. The extended hollow portion 14 is arranged without a gap with respect to the inner peripheral surface 15 of the elastic layer 2, the cylindrical inner peripheral surface 16 of the rigid layer 3, the lower surface 12 of the upper plate 10, and the upper surface 13 of the lower plate 11. And a lead plug 17 as a vibration damping body.

  Each of the elastic layers 2 made of an annular rubber plate made of natural rubber having a thickness t1 = 2.5 mm is vulcanized and bonded to the upper surface and the lower surface in the stacking direction V of the rigid layer 3 facing in the stacking direction V. .

  In the rigid layer 3, each of the uppermost layer and the lowermost rigid layer 3 in the stacking direction V is made of an annular steel plate having a thickness t2 = 20 mm, and the uppermost rigid layer 3 is formed on the upper surface 21 thereof. A recess 23 that is open and defined by a cylindrical inner peripheral surface 22, and a plurality of screw holes 24 that are also open on the upper surface 21 and arranged at equal angular intervals in the circumferential direction R. A recess 23 defined by an inner peripheral surface 22 having a diameter larger than the diameter of the inner peripheral surface 16 of the uppermost rigid layer 3 that defines the upper portion 25 of the hollow portion 14 in the stacking direction V. The lowermost rigid layer 3 communicates with the upper portion 25 of the hollow portion 14 and is defined by a cylindrical inner peripheral surface 27 having an opening at the lower surface 26 and having the same diameter as the inner peripheral surface 22. Open in the recess 28 and also in the lower surface 26 and in the circumferential direction R A plurality of screw holes 29 arranged at angular intervals and having a diameter larger than the diameter of the inner peripheral surface 16 of the lowermost rigid layer 3 that defines the lower portion 30 of the hollow portion 14 in the stacking direction V. The recess 28 defined by the inner peripheral surface 27 communicates with the lower portion 30 of the hollow portion 14 and is arranged between the uppermost rigid layer 3 and the lowermost rigid layer 3 in the stacking direction V. Each of the rigid layers 3 is made of the same annular steel plate having a thickness t3 = 1.6 mm thinner than the uppermost and lowermost rigid layers 3.

  The covering layer 6 having a thickness of about 5 mm and made of the same natural rubber as the elastic layer 2 and having a cylindrical outer peripheral surface 31 and an annular upper end surface 32 and lower end surface 33 has a cylindrical inner peripheral surface. 34 is vulcanized and bonded to the outer peripheral surfaces 4 and 5.

  The upper plate 10 has a disk-shaped upper flange plate 43 having a recess 41 on the lower surface 42 that has the same diameter as the recess 23 and faces the recess 23 in the stacking direction V, and an upper flange in the recess 41. An upper shear key 45 fitted to the uppermost rigid layer 3 in the recess 23 and having a circular lower surface 44, and fitted to the plate 43. In addition to the recess 41, the upper flange plate 43 having 46 includes a plurality of through-holes 47 arranged at equal angular intervals in the circumferential direction R corresponding to the plurality of screw holes 24 in the stacking direction V. A plurality of through holes 48 arranged at equal angular intervals in the circumferential direction R in the vicinity of the outer peripheral surface 46, and inserted into each of the through holes 47 to be the highest in each of the screw holes 24. Via bolt 49 screwed to rigid layer 3 While it is fixed to the rigid layer 3, and is fixed via the anchor bolt inserted into the through hole 48 in the structure of the upper supporting.

  Thus, the lower surface 12 of the upper plate 10 having the upper flange plate 43 and the upper shear key 45 is composed of the lower surface 42 and the lower surface 44, and the upper end surface 8 composed of the upper surface 21 and the upper end surface 32 is the lower surface 12. The lead plug 17 is in contact with the lower surface 44 of the lower surface 12 without a gap at the circular upper end surface 51, and the lead plug 17 disposed in the upper portion 25 is laminated in the stacking direction. The outer peripheral surface 53 of the V upper end 52 is in contact with the inner peripheral surface 16 of the uppermost rigid layer 3 without a gap.

  The lower plate 11 has a disc-like lower flange plate 63 having a recess 61 on the upper surface 62 having the same diameter as the recess 28 and facing the recess 28 in the stacking direction V, and a lower flange in the recess 61. A lower shearing key 65 fitted to the lowermost rigid layer 3 in the recess 28 and having a circular upper surface 64, and fitted to the plate 63. In addition to the recess 61, the lower flange plate 63 having 66 has a plurality of through-holes 67 arranged at equal angular intervals in the circumferential direction R corresponding to the plurality of screw holes 29 in the stacking direction V. A plurality of through-holes 68 arranged at equal angular intervals in the circumferential direction R in the vicinity of the outer peripheral surface 66, and are inserted into the through-holes 67 to be the lowest in each of the screw holes 29. The lowest position through a bolt 69 screwed into the rigid layer 3 While it is fixed to the rigid layer 3, and is fixed via the anchor bolt inserted into the through hole 68 in the lower part of the structure to be placed.

Thus, the upper surface 13 of the lower plate 11 having the lower flange plate 63 and the lower shear key 65 is
The lower end surface 8 composed of the upper surface 62 and the upper surface 64 and the lower surface 26 composed of the lower surface 26 and the lower end surface 33 is in contact with the upper surface 62 of the upper surface 13 without a gap, and the lead plug 17 The outer peripheral surface 73 of the lower end portion 72 of the lead plug 17 disposed in the lower portion 30 in the stacking direction V has no clearance on the inner peripheral surface 16 of the lowermost rigid layer 3. Touching.

  The lead plug 17 made of lead, which is a damping material that absorbs vibration energy by plastic deformation, is press-fitted and filled in the hollow portion 14 defined by the lower surface 44, the inner peripheral surfaces 15 and 16, and the upper surface 64. The lead plug 17 is filled with the lower surface 44, the outer peripheral surfaces 4 and 5 and the upper surface even when the load W in the stacking direction V from the upper structure to be supported is not applied to the upper plate 10 (under no load). 64 with no gaps, and against the elastic force of the elastic layer 2, protrudes in the horizontal direction (shear direction) H toward the elastic layer 2 and slightly bites into the elastic layer 2. As a result of making the peripheral surface 15 a concave surface 81, the inner peripheral surface 82 of the laminate 7 composed of the inner peripheral surfaces 15 and 16 is a concave surface 81 at the position of the inner peripheral surface 15 of the elastic layer 2. Convex surface 83 at position 3 to support When the load W in the stacking direction V from the structure of the portion is applied to the upper plate 10 (under load), the elastic layer 2 is compressed in the stacking direction V and the thickness t1 of the elastic layer 2 is less than 2.5 mm. As a result of the reduction of the height h of the seismic isolation support device 1, the lead plug 17 that is press-fitted and filled in the hollow portion 14 is moved in the horizontal direction H by the elastic layer 2 against the elastic force of the elastic layer 2. The elastic layer 2 protrudes and bites into the elastic layer 2, and the inner peripheral surface 15 of the elastic layer 2 is made a concave surface 81 that is larger and recessed in the horizontal direction (shear direction) H.

The lead plug 17 has an upper shearing of the upper plate 10 from the lead plug 17 in a state where a load W in the stacking direction V (downward force in the stacking direction V) W from the upper structure to be supported is applied to the upper plate 10. Reaction force on the key 45 (upward force in the stacking direction V) Fr surface pressure Pr (= Fr / (area of the upper end surface 51 of the lead plug 17) N / m ² , where N is Newton, the same applies hereinafter) The ratio Pr / P0 to the pressure P0 (= W / (pressure-receiving area with respect to the load W of the laminate 7) N / m ² ) at the pressure-receiving surface of the laminate 7 due to the load W is 1.00 or more. , Are arranged densely in the hollow portion 14.

  The above-described seismic isolation support device 1 is configured such that the lower flange plate 63 is connected to the lower structure via the anchor bolt inserted into the through hole 68 and the upper flange plate 43 is connected to the upper portion via the anchor bolt inserted into the through hole 48. Each of the structures is fixed between the lower structure and the upper structure, receives the load W of the upper structure, and applies the load W in the stacking direction V applied to the upper plate 10 by the stacked body 7 and the lead plug 17. While supporting, the vibration of the upper plate 10 in the horizontal direction H with respect to the lower plate 11 is damped by the plastic deformation of the lead plug 17, while the transmission of the vibration of the lower plate 11 in the horizontal direction H to the upper plate 10 is laminated. 7 is suppressed by shear elastic deformation in the horizontal direction H.

  When manufacturing the seismic isolation support device 1, first, the rigid layer 3 between the plurality of rubber plates having an annular thickness t 1 = 2.5 mm to be the elastic layer 2 and the uppermost and lowermost rigid layers 3. A plurality of steel plates having an annular thickness of t3 = 1.6 mm are alternately stacked, and an annular thickness of t2 = 20 mm is formed as the uppermost and lowermost rigid layers 3 on the lower and upper surfaces thereof. A laminated body 7 is formed by disposing steel plates and fixing them together by vulcanization adhesion under pressure in a mold, etc., and then comprises a lower shear key 65 and a lower flange plate 63 via bolts 69. The lower plate 11 is fixed to the lowermost rigid layer 3, and then 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 constrained by the laminate 7 without a gap in the hollow portion 14. The upper plate 10 composed of the upper flange plate 43 and the upper shear key 45 is fixed to the uppermost rigid layer 3. In the formation of the laminate 7 by vulcanization adhesion under pressure in the mold, the rubber sheet that covers the outer peripheral surfaces 4 and 5 of the elastic layer 2 and the rigid layer 3 and becomes the covering layer 6 is formed on the outer peripheral surfaces 4 and 5. The covering layer 6 bonded by vulcanization may be formed 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 a formation, a part of the inner peripheral side of the rubber plate that becomes the elastic layer 2 flows to cover the inner peripheral surface 16 of the rigid layer 3, and the covering is sufficiently thinner than the thickness 2 mm of the covering layer 6. A layer may be formed.

  In order to confirm that the ratio Pr / P0 between the surface pressure Pr and the surface pressure P0 of the manufactured seismic isolation support device 1 is 1.00 or more, in other words, the ratio Pr between the surface pressure Pr and the surface pressure P0. In order to manufacture the seismic isolation support device 1 with / P0 of 1.00 or more, it corresponds to the upper flange plate 43 and the upper shear key 45 and from the upper shear key 45 fitted in the recess 41 and the recess 23. A load cell (pressure sensor) is interposed between the upper thin shear key and a lead wire from the load cell is led out from the pore formed in the upper flange plate 43, and the seismic isolation support device is attached to the upper plate 10. 1, an electrical signal of the derived lead wire is measured in a state where a load W to be supported is applied, and a surface pressure Pr is detected from the measured electrical signal, and the detected surface pressure Pr and surface pressure P0 are detected. From this, the ratio Pr / P0 is obtained, and the ratio Pr / P0 is 1 If it is 00 or more, the load W on the upper plate 10 is released, the upper flange plate 43 is removed, the temporary upper shear key is replaced with the upper shear key 45, and the upper flange plate 43 is again placed at the uppermost position. When the ratio Pr / P0 is smaller than 1.00, the load W to be supported by the seismic isolation support device 1 on the upper plate 10 is released. Then, the upper flange plate 43 and the temporary upper shear key are removed, and additional lead is pressed into the hollow portion 14. The press-fitting of the additional lead into the hollow portion 14 is performed by pushing the additional lead into the upper portion of the hollow portion 14 with a hydraulic ram or the like. After press-fitting additional lead into the hollow portion 14, the upper flange plate 43 and the temporary upper shear key, and the load cell (pressure sensor) between the upper flange plate 43 and the temporary upper shear key are placed on the uppermost rigid layer 3. The ratio Pr / P0 is obtained from the surface pressure Pr based on the electrical signal from the load cell and the surface pressure P0. The ratio Pr / P0 is equal to or greater than 1.00. In this case, instead of the temporary upper shear key, the upper shear key 45 and the upper flange plate 43 are fixed to the uppermost rigid layer 3 with bolts 49, while the ratio Pr / P0 is smaller than 1.00. Until the ratio Pr / P0 becomes 1.00 or more, the press-fitting of the additional lead into the hollow portion 14 is repeated.

  When the ratio Pr / P0 is 1.00 or more, the inner peripheral surface 15 of the elastic layer 2 may not be deformed into the concave surface 81 with no load (W = 0).

  In the seismic isolation support device 1 manufactured in this way, since the ratio Pr / P0 between the surface pressure Pr and the surface pressure P0 is 1.00 or more, the lead plug 17 disposed in the hollow portion 14 is provided without a predetermined gap. As a result of being constrained by the elastic layer 2 and the rigid layer 3 and the upper plate 10 and the lower plate 11, stable seismic isolation characteristics can be obtained, and in addition, fatigue and damage of the elastic layer 2 and the lead plug 17 can be avoided. In particular, excellent durability, seismic isolation effect and manufacturability can be obtained.

Seismic isolation support device 1 of Examples 1 to 3
Elastic layer 2: thickness t1 = 2.5 mm, diameter (outer diameter) of outer peripheral surface 4 = 250 mm, diameter (inner diameter) of cylindrical inner peripheral surface 15 before deformation = 50 mm, and shear modulus = G4 20 circular rubber plates made of natural rubber are used. Uppermost layer and lowermost rigid layer 3: Thickness t2 = 20 mm, diameter of outer peripheral surface 5 (outer diameter) = 250 mm, diameter of inner peripheral surface 16 ( (Inner diameter) = 50 mm steel plate used Depth of each of recesses 23 and 28 = 10 mm
A rigid layer 3 between the uppermost layer and the lowermost rigid layer 3: 19 steel plates having a thickness t3 = 1.6 mm, a diameter of the outer peripheral surface 5 (outer diameter) = 250 mm, and a diameter (inner diameter) of the inner peripheral surface 16 = 50 mm. Use of sheet Thickness of coating layer 6 = 5 mm
In the seismic isolation support device 1, with respect to the load W to be supported = 600 kN, the ratio Pr / P0 = 1.09 in the first embodiment and the ratio Pr / P0 = 2.02 in the second embodiment. Thus, in Example 3, the hollow portion 14 was filled with lead so that the ratio Pr / P0 = 2.50.

Seismic isolation support device of comparative example Seismic isolation support similar to Examples 1 to 3 except that the hollow portion 14 is filled with lead so that the ratio Pr / P0 = 0.73 with respect to the supporting load W = 600 kN The device was manufactured.

  With a horizontal displacement of maximum ± 5 mm with respect to the upper plate 10 in a state where a load W = 600 kN is applied to the upper plate 10 of each of the seismic isolation support devices 1 of Examples 1 to 3 and the seismic isolation support device of the comparative example The results of measuring the hysteresis characteristics of horizontal displacement-horizontal force (horizontal stress) when vibration is applied to the lower plate 11 in the horizontal direction H are shown in FIGS. As is clear from the hysteresis characteristics shown in FIGS. 4 to 6, the seismic isolation support device 1 of Examples 1 to 3 can obtain a stable seismic isolation characteristic, has a trigger function, and has a large amplitude earthquake. In addition, as is clear from the hysteresis characteristic shown in FIG. 7, in the seismic isolation support device of the comparative example, a dent is generated as shown by an arrow, resulting in an unstable seismic isolation characteristic. It turns out that a function cannot be obtained favorably. It has been found that if the ratio Pr / P0 is 5.90 or less, it is easy to press-fit lead into the hollow portion 14 in manufacturing, and there is no difficulty. In addition, lead is pressed into the hollow portion 14 so that the ratio Pr / P0 exceeds 5.90, but it may be difficult to do this without damaging the inner peripheral surface 15 of the elastic layer 2. found.

  As is clear from the comparison of the hysteresis characteristics shown in FIG. 4 and FIG. 7, when the lead plug 17 is arranged in the hollow portion 14 so that the ratio Pr / P0 is 1.00, it is shown in FIG. It was also confirmed that a history characteristic equivalent to the history characteristic can be obtained.

DESCRIPTION OF SYMBOLS 1 Seismic isolation support device 2 Elastic layer 3 Rigid layer 4, 5 Outer peripheral surface 6 Cover layer 7 Laminate body 8 Upper end surface 9 Lower end surface 10 Upper plate 11 Lower plate 12 Lower surface 13 Upper surface 14 Hollow portion 15 Inner peripheral surface 16 Inner peripheral surface 17 Lead plug

Claims (12)

  Surrounded by a laminate having alternately laminated elastic layers and rigid layers, an upper plate and a lower plate attached to the upper end surface and lower end surface of the laminate, an elastic layer and a rigid layer, and upper and lower plates And a vibration damping member disposed in a hollow portion extending in the stacking direction from the lower surface of the upper plate to the upper surface of the lower plate, and supports the load in the stacking direction applied to the upper plate by the laminate and the vibration damping member. A seismic isolation support device configured to perform a surface pressure Pr from a vibration damping body to an upper plate based on a load in a stacking direction to be supported and a surface pressure at a pressure receiving surface with respect to the load of the stack based on the load. A seismic isolation support device in which a vibration damping body is arranged in a hollow portion so that a ratio Pr / P0 with P0 is 1.00 or more (ratio Pr / P0 ≧ 1.00).   Surrounded by a laminate having alternately laminated elastic layers and rigid layers, an upper plate and a lower plate attached to the upper end surface and lower end surface of the laminate, an elastic layer and a rigid layer, and upper and lower plates And the elastic layer and the rigid layer, and a vibration damping body disposed without a gap with respect to the upper plate and the lower plate in a hollow portion extending in the stacking direction from the lower surface of the upper plate to the upper surface of the lower plate. And a vibration isolator that supports the load in the stacking direction applied to the upper plate by the laminate and the vibration damping body, the surface from the vibration damping body to the upper plate based on the load in the stacking direction to be supported The vibration damping body is hollow so that the ratio Pr / P0 of the pressure Pr and the surface pressure P0 at the pressure-receiving surface with respect to the load of the laminate based on the load is 1.00 or more (ratio Pr / P0 ≧ 1.00). Seismic isolation support device arranged in the department.   Surrounded by a laminate having alternately laminated elastic layers and rigid layers, an upper plate and a lower plate attached to the upper end surface and lower end surface of the laminate, an elastic layer and a rigid layer, and upper and lower plates And a vibration damping member disposed in a hollow portion extending in the stacking direction from the lower surface of the upper plate to the upper surface of the lower plate, and supports the load in the stacking direction applied to the upper plate by the laminate and the vibration damping member. At the same time, the vibration in the direction perpendicular to the laminating direction of the upper plate relative to the lower plate is damped by plastic deformation of the vibration damping body, while the transmission to the upper plate of the vibration in the direction perpendicular to the laminating direction of the lower plate is laminated. A seismic isolation support device configured to be suppressed by shear elastic deformation of a body, the surface pressure Pr from the vibration damping body to the upper plate based on the load in the supporting stacking direction, and the load of the stack based on the load The ratio Pr / P0 to the surface pressure P0 at the pressure-receiving surface against 1.0 is 1.0 Above so that the (ratio Pr / P0 ≧ 1.00), the seismic isolation support device comprising a vibration damping member is disposed in the hollow portion.   Surrounded by a laminate having alternately laminated elastic layers and rigid layers, an upper plate and a lower plate attached to the upper end surface and lower end surface of the laminate, an elastic layer and a rigid layer, and upper and lower plates And the elastic layer and the rigid layer, and a vibration damping body disposed without a gap with respect to the upper plate and the lower plate in a hollow portion extending in the stacking direction from the lower surface of the upper plate to the upper surface of the lower plate. In addition, the load in the stacking direction applied to the upper plate is supported by the laminate and the vibration damping body, and the vibration in the direction perpendicular to the stacking direction of the upper plate with respect to the lower plate is attenuated by plastic deformation of the vibration damping body. A seismic isolation support device configured to suppress the transmission of vibration in a direction perpendicular to the stacking direction of the plates to the upper plate by shear elastic deformation of the stack, and the vibration damping body based on the load in the supporting stacking direction Laminate based on surface pressure Pr to upper plate and load Seismic isolation support device in which the vibration damping body is disposed in the hollow portion so that the ratio Pr / P0 to the surface pressure P0 at the pressure receiving surface with respect to the load is 1.00 or more (ratio Pr / P0 ≧ 1.00). .   The ratio Pr / P0 exceeds 1.00 (ratio Pr / P0> 1.00), or 1.09 or more (ratio Pr / P0 ≧ 1.09), 2.02 or more (ratio Pr / P0 ≧ 2) .02) or 2.50 or more (ratio Pr / P0 ≧ 2.50), wherein the vibration attenuator is disposed in the hollow portion. apparatus.   The immunity according to any one of claims 1 to 5, wherein the vibration damping body is disposed in the hollow portion so that the ratio Pr / P0 is 5.90 or less (ratio Pr / P0 ≤ 5.90). Seismic support device.   The seismic isolation support device according to any one of claims 1 to 6, wherein the vibration damping body is made of a damping material that absorbs vibration energy by plastic deformation.   The seismic isolation support device according to claim 7, wherein the damping material is made of lead, tin, or a lead-free low melting point alloy.   The seismic isolation support according to any one of claims 1 to 8, wherein the inner peripheral surface of the laminate that defines the hollow portion has a vibration damping body that bites into the elastic layer and is concave at the position of the elastic layer. apparatus.   The seismic isolation support device according to any one of claims 1 to 9, wherein the inner peripheral surface of the laminate that defines the hollow portion is a convex surface at the position of the rigid layer, with the vibration damping body biting into the elastic layer. .   The uppermost rigid layer in the stacking direction has a first recess that opens at the upper surface thereof and communicates with the upper portion of the hollow portion with a diameter larger than that of the upper portion of the hollow portion. The upper flange plate having the same diameter as the first recess and the second recess facing the first recess in the stacking direction on the lower surface, and the upper flange plate in the second recess And an upper shear key fitted to the uppermost rigid layer in the first recess, and the outer peripheral surface of the upper end portion of the vibration damping body is the upper part of the hollow portion. The seismic isolation support device according to any one of claims 1 to 10, wherein the seismic isolation support device is in contact with the inner peripheral surface of the uppermost rigid layer that defines The lowermost rigid layer in the stacking direction has a third recess that opens at the lower surface thereof and communicates with the lower portion of the hollow portion with a diameter larger than that of the lower portion of the hollow portion. The lower flange plate having the same diameter as that of the third recess and having the fourth recess facing the third recess in the stacking direction on the upper surface, and the lower flange plate in the fourth recess And a lower shear key fitted to the lowermost rigid layer in the third recess, and the outer peripheral surface of the lower end of the vibration damping body is the lower part of the hollow part. The seismic isolation support device according to any one of claims 1 to 11, which is in contact with an inner peripheral surface of a lowermost rigid layer that defines

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