JPH1130275A - Laminated rubber support body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate filling without generating torsion or chipping to a damper member while preventing the generation of a clearance positively at the time of filling, with the bite quantity of the damper member controllable with high accuracy and positively seal the damper member with high internal pressure. SOLUTION: A base isolating member 5 formed by alternately laminating deformable parts formed of rubber material and deformation resistant parts formed of hard material, and provided with a cavity part forming a hollow part 14 closed with supporting means, and a damper member 6 disposed in the hollow part 14 are provided between the supporting means fixed to structure bodies. One supporting means is provided with a center cap 9 loosely fitted into a through hole 8 provided in a base 7, and the center cap 9 is pushed down to fill the damper member 6 in the hollow part 14. A welding chamfer 19 is formed at the outer peripheral outward edge E1 of the center cap 9 or the inner peripheral outward edge E2 of the through hole 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation / seismic isolation bearing for reducing the acceleration of vibrations input to structures, various devices, arts and crafts, etc. due to, for example, earthquakes, mechanical vibrations, or traffic vibrations. It relates to a laminated rubber bearing used.

[0002]

2. Description of the Related Art For example, structures such as buildings, bridges, tanks, and computers,
Devices such as medical equipment, security equipment, precision manufacturing equipment, analytical analysis equipment, etc., or seismic isolation / seismic isolation bearings that reduce the acceleration of vibration applied to arts and crafts, for example, FIG. 13 (A)
As shown schematically, a hard plate b1 such as a steel plate and a rubber plate b2
A laminated rubber bearing body a in which a damper member d such as a lead plug is sealed in a hollow portion c of a seismic isolation member b in which the seismic isolation members b are alternately laminated, and the weight of the structure is supported by the seismic isolation member b And damping the acting force acting on the structure from the foundation, and also absorbs the vibration energy of the structure generated after the acting force is damped by the seismic isolation member b by the damper member d, and vibrates the structure itself. Attenuate.

Further, in the laminated rubber bearing body a in which the damper member d is enclosed, the volume of the hollow portion c before the encapsulation is:
The ratio of the volume of the damper member d to the volume of the damper member d greatly affects the absorption (damping performance) of vibration energy. For example, when the volume of the damper member d is less than the volume of the hollow portion c, the seismic isolation member b A gap is generated between the damper member d and the like, and the shear deformation of the seismic isolation member b is not accurately transmitted to the damper member d, and there is a problem that the damping performance is significantly reduced.

However, even when the volume of the hollow portion c and the volume of the damper member d are equal and the gap does not occur, even when the seismic isolation member b is sheared and deformed, the vibration of the seismic isolation member b and the damper member d is reduced. It has been found that it is difficult to obtain a desired damping performance, for example, slippage occurs and transmission loss is caused.

Accordingly, the present inventor encloses a damper member d having a larger volume than the volume of the hollow portion c before the enclosing, and a part of the damper member d is hard plate b1 on the inner peripheral surface of the seismic isolation member b. , B1 to ensure that slippage with the seismic isolation member b is suppressed and that high-performance damping characteristics can be exhibited. For this purpose, at the time of filling, a gap does not occur and the amount of biting of the damper member d can be controlled with high precision, and the filled damper member d is securely sealed at a high internal pressure in the hollow portion c. New structures are needed.

[0006] Japanese Unexamined Patent Publication No. 62-225666 and Japanese Unexamined Utility Model Publication No. 4-46247 disclose the aforementioned FIG.
As shown in (A), a structure in which a hollow portion c is directly closed by a fixing plate e for fixing a structure provided at both ends of a seismic isolation member b has been proposed. This is usually a non-vulcanized seismic isolation member b
When the seismic isolation member b and the fixing plate e are integrally joined by adhesive vulcanization by pressurizing and heating the fixing plates e and e, the hollow c of the damper member d set in the seismic isolation member b in advance Containment at the same time. As a result, the volume of the hollow portion c greatly varies due to the pressurization during the adhesive vulcanization, and when cooled, the hollow portion c and the damper member d
Each volume changes. Therefore, not only can the bite amount of the damper member d not be controlled with high precision, but also a gap may be generated between the seismic isolation member b and the damper member d.

On the other hand, Japanese Unexamined Patent Publication (Kokai) No. 61-176776 discloses, as schematically shown in FIG.
A screw hole e1 leading to the screw hole e1 is provided, and a damper member d inserted from the screw hole e1 is sealed by a cap f screwed into the screw hole e1. But,
In particular, when a damper member d having a larger volume than the hollow portion c is press-fitted, it is difficult to seal the damper member d with a high internal pressure by screwing the cap f, since the restoring force of the damper member d is large. It is. Moreover, with the screwing of the cap f at the time of press-fitting, the damper member d is twisted, and the cap f and the damper member d are damaged by scraping and chipping.
Impairs durability and damping performance. When the root diameter of the screw hole e1 is made equal to the diameter of the hollow portion c, the screw hole e1 is damaged by, for example, causing contact with the screw thread when the damper member d is inserted. When the diameter is equal to the diameter, there is also a problem that the threaded portion of the cap f that enters below the fixing plate e damages the seismic isolation member b.

Therefore, the invention according to claim 1 of the present invention is based on fixing a center cap capable of filling a hollow portion with a damper member by pressing down by welding without causing torsion or the like of the damper member. Filling is possible, and the filling amount of the damper member can be easily adjusted, so that the occurrence of a gap at the time of filling can be reliably prevented.
In particular, it is an object of the present invention to provide a laminated rubber bearing body capable of managing a biting amount of a damper member with high accuracy and further securely sealing the damper member at a high internal pressure.

Another object of the present invention is to provide a laminated rubber bearing which can secure a necessary welding strength while eliminating an adverse effect on a rubber material of a seismic isolation member due to welding heat of a center cap. .

Another object of the present invention is to provide a laminated rubber bearing which can effectively suppress the slip between the center cap and the damper member and can further improve the damping performance.

[0011]

According to one aspect of the present invention, there is provided a laminated rubber bearing which is interposed between two structures and is seismically isolated therebetween. A laminated base for seismic isolation in which a sheet-shaped deformed portion made of a rubber material and a sheet-shaped deformable portion made of a hard material are alternately stacked between supports fixed to the structure, And a seismic isolation member provided with a hollow portion that passes through the deformation-resistant portion and forms a hollow portion closed by the support, and a damper member for absorbing vibration energy disposed in the hollow portion. The supporter includes at least one of a substrate and a center cap that fills the hollow portion with the damper member by being loosely fitted and pressed into a through hole provided in the substrate, and an outer peripheral edge of the center cap. Or The inner peripheral outward edge of the through hole of the substrate, it is proposed that is characterized by the formation of the chamfer for welding.

According to a second aspect of the present invention, the chamfer is
It is characterized by 10-30% of the height of the center cap.

The invention according to claim 3 is characterized in that a projection is provided on an inward surface of the center cap facing the damper member.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, the laminated rubber support 1 includes upper and lower supports 3A and 3B fixed to a lower structure 2B as a foundation and an upper structure 2A as a building, respectively. This support 3A, 3B
The seismic isolation member 5 and the damper member 6 are provided between them.

At least one of the supports 3A, 3B is a plate-like substrate in which, in this example, both supports 3A, 3B are fixed to each of the structures 2A, 2B using a fixing fitting such as a bolt. 7 and a center cap 9 which is loosely fitted in a through hole 8 provided in the center of the substrate 7 to close the through hole 8. The through hole 8 has a stepped surface 8b inside the large diameter portion 8a into which the center cap 9 is fitted.
The small-diameter portion 8c is provided through the opening.

As shown in FIG. 3, the center cap 9 has a disk-shaped base 18 which is loosely fitted to the large diameter portion 8a.
A chamfer 19 for welding is provided on one or both of the outer peripheral edge E1 of the base 18 and the inner peripheral outer edge E2 of the through hole 8, and in this example, on the outer peripheral edge E1 of the base 18. Has formed. The base 18 has one or more projections 23 embedded in the damper member 6 by pressing down the damper member 6 on an inward surface 18S facing the damper member 6.
Preferably, a plurality is provided. The projection 23 is preferably formed in a cone shape with a tapered tip in order to facilitate the embedding. The protrusion height may be 0.5 mm or more, and the upper limit of the protrusion height is preferably about 3 mm or less to suppress breakage damage.

The seismic isolation member 5 comprises a laminated base 12 for seismic isolation in which sheet-like deformed portions 10 made of rubber material and sheet-shaped deformable portions 11 made of hard material are alternately laminated. A cavity 13 is formed in the laminated base 12 so as to extend vertically through the deformable portion 10 and the deformation-resistant portion 11 and communicate with the through hole 8. The hollow portion 13 has substantially the same cross section as the small diameter portion 8c.
3 and the small diameter portion 8c form a series of hollow portions 14 into which the damper member 6 is filled.

The deformation-resistant portion 11 is made of a rigid metal plate, such as a steel plate. In this embodiment, the deformation-resistant portion 11 is formed in a disk shape through the hole for forming the cavity, for example. . Various rubber materials can be used as the deformed portion 10, but those having excellent mechanical strength, long-term stability of elastic modulus, long-term stability of deformability, and creep resistance are required.
For example, natural rubber (NR), chloroprene rubber (CR) and the like are preferably used. The thickness T1 of the deformable portion 10 is larger than the thickness T2 of the deformable portion 11, usually about 1.3 to 2.0 times. In this example, T1 = 4.2 mm and T2 = 2.5 mm.
I'm using

The rubber vulcanization and / or adhesive of the deformed portion 10 after lamination is applied between the substrate 7 and the laminated base 12 and between the deformed portion 10 and the deformation resistant portion 11 of the laminated base 12. It is integrally and firmly connected by using. In this example, the outer periphery of the laminated base 12 is covered with the deformable portion 10 and the deformable portion 11, thereby protecting the seismic isolation member 5 from corrosion, damage, and the like. 15 are formed.

The damper member 6 is a straight columnar body made of a metal material which is easily plastically deformed, for example, lead.
4 is tightly filled (enclosed) with substantially no space.

At this time, the cavity 13 of the damper member 6 is
Is larger than 1.0 times the volume VA of the cavity 13 before the damper member 6 is sealed, and 1.
05 or less. More specifically, as shown in FIG. 4 (A), the inner peripheral surface of the cavity 13 before the sealing is substantially aligned with the inner surface of the deformable portion 10 and the inner surface of the deformable portion 11. In this example, the cross section is a straight cylindrical shape having a circular cross section, and the cross section shape matches the cross section shape of the small diameter portion 8c.

On the other hand, after the sealing, since VL> VA, the damper member 6 presses the inner peripheral surface of the hollow portion 13, and as shown in FIG. The amount of the damper member 6 corresponding to (VL-VA) bites into the soft deformable portion 10. The biting portion 6a of the damper member 6 has a wavy contour and is restrained by being sandwiched between the hard deformation-resistant portions 11, so that the slippage between the hollow portion 13 and the damper member 6 after sealing is performed. Is reliably suppressed, and the shearing deformation of the seismic isolation member 5 is accurately transmitted to the damper member 6 without causing a transmission loss, so that the damping performance can be greatly improved.

When the volume VL of the damper member 6 is not more than 1.0 times the volume VA of the hollow portion 13 before sealing,
Since the bite does not occur, as shown schematically in FIG. 5, the transmission loss between the seismic isolation member 5 and the damper member 6 increases, and the damping performance is greatly reduced. On the other hand, when it exceeds 1.05 times, although the damping performance is maintained high, the amount of penetration of the damper member 6 becomes excessive and induces the adhesion peeling between the deformed portion 10 and the deformable portion 11, and This causes the deformation-resistant member 11 to bend and deform, such as torsion, thereby reducing strength and durability, and lowering the vibration damping effect of the seismic isolation member 5. Therefore, the upper limit of the volume VL is preferably 1.040 times or less, more preferably 1.035 times or less of the volume VA, and the lower limit is preferably 1.010 times or more, more preferably 1.020 times or more of the volume VA.

In order to form the biting portion 6a of the damper member 6, it is necessary to compress the damper member 6 in the length direction and expand it in the radial direction at the time of filling. That is, the filling of the damper member 6 is performed as shown in FIG.
The laminated base 12 whose one end (for example, the lower end) of the through hole 8 is previously closed by fixing the center cap 9 is placed on the lower head M1 of the pressing machine M, and
The damper member 6 is inserted therein. The cross-sectional shape of the inserted damper member 6 before compression is substantially similar to the cross-sectional shape of the hollow portion 13 before compression. In this example, the damper member 6 has a straight columnar shape. The diameter D is 0.9 times or more and smaller than 1.0 times the diameter DR of the hollow portion 13 before compression. Thereby, it can be easily inserted without damaging the inner peripheral surface of the cavity 13. The cross-sectional shape of the damper member 6 and the like may be a non-circular shape including a polygon such as a quadrangle or a pentagon, in addition to the circular shape as in the present embodiment. In this case, the maximum width in the cross-section is called a diameter. In addition, in order to facilitate insertion, the chamfered portion may be formed at one end or both ends of the damper member 6 before compression. However, since the chamfered portion remains even after sealing, when the chamfered portion is provided. Is preferably C5.0 mm or less.

If the diameter D is not less than 1.0 times the diameter DR, the damper member 6 may damage the deformed portion 10 on the inner peripheral surface of the hollow portion 13 during insertion, and this damage may cause damage to the nucleus. As a result, the strength and durability are reduced, such as inducing delamination of the deformed portion 10 and the deformable portion 11. When the ratio is less than 0.9, the rate of expanding the damper member 6 in the radial direction by compression is unnecessarily increased, so that the workability in the compression stroke is significantly impaired, and uniform expansion is hardly obtained. Therefore,
The diameter D is preferably smaller than the diameter DR in the range of 0.5 to 1.0 mm.

The damper member 6 is easily bent and deformed during compression. For this reason, the height h of the damper member 6 before compression is set to be in a range of 1.0 to 3.0 times the diameter D. good.

On the upper surface of the inserted damper member 6, an upper center cap 9 is placed. As the upper head M2 of the pressurizing machine M is lowered, the center cap 9 is pressed down, and the damper member 6 is compressed and hollow. Filled in the part 14. Since the damper member 6 is compressed using the center cap 9 in this manner, the boundary surface between the center cap 9 and the damper member 6 is closely aligned, and the generation of a gap therebetween can be reliably prevented. Moreover, since the protrusions 23 can be embedded in the damper member 6, slippage at the boundary surface during shear deformation is suppressed, and further high-performance damping performance can be exhibited.

In the compression, it is necessary to convert the compressive strain (longitudinal strain) of the damper member 6 into radial expansion (lateral strain) substantially uniformly over the entire length. In this method, two or more cycles of pressurization and subsequent stress relaxation are repeated until the final filling pressure is reached, and the material is gradually compressed. More specifically, the compression between the center cap 9 and the fixed position where the center cap 9 is fitted into the substrate 7 and abuts on the step 8b is performed in, for example, a plurality of steps.
As schematically shown in (A), after a first pressurizing step 16A in which a predetermined length of compression is performed by an initial (first) forced pressurization, a first stress relaxation step in which this compression height is maintained 1
Perform 7A and wait until the internal stress is relaxed and the longitudinal strain is converted to a transverse strain.

The cycle consisting of the pressurizing step 16 and the stress relaxing step 17 is performed two or more times, for example, three cycles, and after the center cap 9 is arranged at the fixed position by the final (third) pressurizing step 16C. Final (third)
The stress relaxation step 17C confirms whether the stress relaxation has reached an equilibrium state. This check confirms that the pressure drop is 1
Performed by being 0 per minute. In each pressurizing step 16, the compression speed is sufficiently low in consideration of the stress relaxation speed (for example, 1500 kgf / cm ² · sec or less).
And the final filling pressure is 1600 kg
f / cm ² or less is preferable. The compression speed is 2
If it exceeds 000 kgf / cm ² · sec, a caulked portion of the damper member 6 is likely to be formed near the upper end of the hollow portion 14,
The compression may be uneven. And the final filling pressure is 2
When it is larger than 000 kgf / cm ² , the laminated base 12 bends in the deformation-resistant portion, causing deformation such as twisting.

Further, the gap between the center cap 9 and the substrate 7 at the fixed position is fixed by welding, and the upper end of the hollow portion 14 is closed to enclose the damper member 6.

As described above, the center cap 9 has a chamfer 1 for welding on the outer peripheral edge E1 of the base 18.
9 is formed over the entire circumference, and is integrally fixed by the welding material 21 entering the groove 20 between the chamfer 19 and the substrate 7. Various welding means such as arc welding using a welding material such as a welding rod can be used for welding.

The damper member 6 is pushed back by the restoring force of the rubber material or the like in the seismic isolation member 5, and generates a large force for pushing up the center cap 9. Therefore, this pushing up is prevented by welding the center cap 9, and the damper member 6 can be reliably and stably sealed at a high internal pressure.

Here, the depth Ta of the chamfer 19 is preferably not less than 10% and not more than 30% of the height Tb of the center cap 9, and if it is less than 10%, the welding strength is insufficient and the pushing up is not possible. If the blocking is not reliably ensured, and if it exceeds 30%, the strength, performance, and durability of the seismic isolation member 5 deteriorate, for example, due to the deterioration of the rubber material of the seismic isolation member 5 due to the heat of welding. Therefore, the lower limit is preferably 15% or more, more preferably 20% or more, and the upper limit is preferably 25% or less.

As shown in FIGS. 8 (A) and 8 (B), the chamfer 19 is formed on the outer peripheral edge E2 of the through hole 8 and further on the outer peripheral edge E1 and the outer peripheral edge of the through hole 8. It may be formed on both the facing edge E2.

In order for the damper member 6 to exhibit a specified damping performance, the damper member 6 must have a continuous integral part at least in the cavity 13 in the sealed state. is necessary. In other words, as shown in FIG. 9, in the portion arranged in the small-diameter portion 8 c, the damper member 6 includes one or more thin plate-like member pieces 2 having the same cross section as the damper main portion 25 A arranged in the cavity 13.
5B. Therefore, when the center cap 9 is pushed to the fixed position, the damper member 6
When it is determined that the sealing amount is insufficient, once the center cap 9 is removed and the member piece 25B is added, the occurrence of a gap can be eliminated and the biting portion 6a can be managed and formed with high precision.

Here, assuming that the volume of the cavity 13 before filling is VA, the diameter of the cavity 13 is DR, and the height of the cavity 13 is HL, VA = π · DR ² · HL / 4 It is represented by (1). That is, VA is determined by the dimensions when the laminated rubber base 12 is formed. In addition, cavity 13 after encapsulation
The volume VL of the damper member 6 enclosed by the following formula is expressed by the following formula: VL = (1.0 to 1.05) · VA where Do is the effective diameter of the damper member 6 at the time of the enclosure. That is, the bite amount VL of the damper member 6
By setting -VA in the range of (0-0.05) .VA, the effective diameter Do is determined. The cavity 1
Assuming that the diameter of the damper member 6 sealed in 3 before enclosing is D, the length is h ', and the Poisson's ratio (longitudinal strain / lateral strain) of the damper member 6 is ν, ν = ｛(Do−D) / Do} / {(h'-HL) / HL} --- It is represented by Formula (3). When the material of the damper member 6 is set, for example, in the case of lead, the Poisson's ratio ν is 0.44, and the diameter D is selected in the range of 0.9 to 1.0 times the DR. According to the above formulas (1) to
According to (3), dimensions such as the height h 'can be set. In addition,
The total volume of the damper member 6 which is a material needs to be the volume V V = π · DR ² · (h1 + h2) / 4 filled in the small diameter portion 8c in addition to the volume VL. Therefore, substantially, the total length h of the damper member 6 as a material is h ′ + DR ² · (h1 + h2) /
The D ^2. Here, h1 and h2 are the lengths of the small diameter portion 8c, respectively.

The inner peripheral surface of the hollow portion 14 is
As shown in FIG. 1 (A), an inner rubber layer 22 for buffering minute vibrations may be formed. At this time, similarly, the damper member 6
As shown in FIG. 11 (B), after encapsulation, a biting portion 6a that bites in the radial direction between the deformation resistant portions 11 can be formed in a wavy shape.

Further, the support 3 is composed of the substrate 7 and the center cap 9.
And welded using the chamfer 19 formed on at least one of the substrate 7 and the center cap 9 when the volume ratio VL / VA is less than 1.0, or when the volume ratio VL / VA is less than 1.0. Although it can be adopted at times, the above-mentioned effect can be optimally exhibited, especially when the value is larger than 1.0.

[0039]

EXAMPLE A laminated rubber bearing having the structure shown in FIGS. 1 and 2 was prototyped based on the specifications in Table 1, and the presence or absence of lifting (push-up) of the center cap 9 in each prototype after being left for 48 hours. Was visually confirmed, and the presence or absence of a biting portion in the damper member was confirmed by disassembly.

The dimensions of the laminated rubber bearings of Examples 1 to 4 and Comparative Examples 1 and 2 were φ240 mm (outer diameter) × 110 mm.
(Height), and the dimensions of the laminated rubber supports of Examples 5 to 9 were φ600 mm (outer diameter) × 252 mm (height).

[0041]

[Table 1]

As shown in Table 1, the laminated rubber bearings of Examples 1 to 9 do not have the center cap 9 lifted up, and the corrugated biting portion is formed on the peripheral surface of the damper member.
It can be seen that the high internal pressure of the damper member is stably and reliably sealed.

FIG. 12 shows the relationship between the lateral force (horizontal force) δ and the lateral displacement (horizontal displacement) δ when a lateral force (horizontal force) F is generated in the laminated rubber bearing member of the first embodiment. In addition to the solid line, the relationship between the lateral force F and the lateral displacement (horizontal displacement) δ in Comparative Example 3 in which the ratio VL / VA is 1.00 is shown by a broken line in FIG. The larger the area in the curve, the higher the effect of absorbing vibration energy is.
It can be seen that is superior to Comparative Example 3 in the damping performance.

FIGS. 7 (A) to 7 (F) show the pressurizing steps during the preparation of Examples 1 to 4 and Comparative Examples 1 and 2. FIG. 7 (A)
As shown in (F), it can be seen that as the ratio VL / VA increases, the stress relaxation time becomes longer, and a longer time is required for the compression stroke. As shown in FIG. 10, the relative pressure drop due to stress relaxation is such that the larger the ratio VL / VA, the larger the pressure drop with respect to the input forced pressure value.

[0045]

As described above, the laminated rubber bearing of the present invention
Since the support is formed by the substrate and the center cap and is welded by using the chamfer formed on at least one of the substrate and the center cap, the damper member can be filled without twisting or the like, and the filling can be performed. In addition to reliably preventing the occurrence of gaps at the time, the amount of bite of the damper member can be controlled with high precision, and the damper member can be reliably sealed at a high internal pressure.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a laminated rubber bearing according to one embodiment of the present invention.

FIG. 2 is a plan view.

FIG. 3 is a perspective view illustrating a welding state of a center cap.

FIG. 4A is a cross-sectional view showing a relationship between a seismic isolation member and a damper member before enclosing, and FIG. 4B is a cross-sectional view showing a relationship between the seismic isolation member and a damper member after enclosing.

FIG. 5 is a schematic diagram showing a relationship between a specific ratio VL / VA and vibration energy-absorptivity.

FIG. 6 is a cross-sectional view illustrating a step of enclosing a damper member.

FIGS. 7A to 7F are diagrams illustrating a pressurizing step at the time of preparing Examples 1 to 4 and Comparative Examples 1 and 2, respectively.

FIGS. 8A and 8B are cross-sectional views showing another example of chamfering.

FIG. 9 is a sectional view showing another example of the damper member.

FIG. 10 shows relative pressure drop and ratio VL due to stress relaxation.
FIG. 3 is a diagram showing a relationship with / VA.

11A is a cross-sectional view showing a relationship between a seismic isolation member and a damper member before encapsulation in another example of the seismic isolation member, and FIG. 11B is a cross-sectional view showing a relation after encapsulation.

FIG. 12 is a diagram showing a relationship between a lateral force F acting on a laminated rubber bearing body and a lateral displacement (horizontal displacement) δ.

13A and 13B are cross-sectional views illustrating a conventional laminated rubber bearing.

[Explanation of symbols]

 2A, 2B Structure 3A, 3B Support 5 Seismic isolation member 6 Damper member 7 Substrate 8 Through hole 9 Center cap 10 Deformation part 11 Deformation resistant part 12 Laminated base 13 Cavity part 14 Hollow part 19 Chamfer 23 Projection E1 Outer periphery of center cap Outward edge E2 Outward edge of through hole

Claims (3)

[Claims] 1. A laminated rubber bearing interposed between two structures and seismically isolated between the two structures, wherein a sheet-shaped deformed portion made of a rubber material and a rigid member are interposed between supports fixed to the structures. A laminated body for seismic isolation, in which sheet-shaped deformation-resistant portions made of a material are alternately stacked, is provided with a cavity portion that passes through the deformation portion and the deformation-resistant portion and forms a hollow portion closed by the support. In addition to a seismic isolation member and a damper member for absorbing vibration energy provided in the hollow portion, at least one of the support members is loosely fitted into a substrate and a through-hole provided in the substrate and pushed down. And a center cap that fills the hollow portion with the damper member. The laminated rubber bearing body has a chamfer for welding formed on an outer peripheral edge of the center cap or an inner peripheral outer edge of the through hole of the substrate. . 2. The laminated rubber bearing according to claim 1, wherein the chamfer is 10 to 30% of the height of the center cap. 3. The laminated rubber bearing according to claim 1, wherein the center cap is provided with a projection for pushing down the damper member on an inward surface facing the damper member.