Seismic isolation apparatus

A seismic isolation apparatus comprising:

• a laminated body having alternately laminated elastic layers and rigid layers;
• a hollow portion provided in an interior of said laminated body in a hermetically closed manner and extending in a laminated direction;
• a vibration damping member which is densely filled in said hollow portion and is adapted to damp vibration in a shearing direction of said laminated body by absorbing vibrational energy in the shearing direction of said laminated body;
• and
• a first closure member which closes one end in the laminated direction of said hollow portion and has a first flow guiding concave surface which comes into contact with one end portion in the laminated direction of said vibration damping member, in order to guide and assist plastic flow of said vibration damping member at one end portion in the laminated direction of said hollow portion in deformation of said vibration damping member due to the vibration in the shearing direction of said laminated body,
• said hollow portion being defined by inner peripheral surfaces of the elastic layers and the rigid layers and by the first flow guiding concave surface,
• wherein said hollow portion includes a columnar hollow portion defined by the inner peripheral surfaces of the elastic layers and the rigid layers and a truncated conical hollow portion defined by the first flow guiding concave surface, and the first flow guiding concave surface has a semispherical concave surface and a flat surface connected continuously to the semispherical concave surface.

A seismic isolation apparatus comprising:

• a laminated body having alternately laminated elastic layers and rigid layers;
• a hollow portion provided in an interior of said laminated body in a hermetically closed manner and extending in a laminated direction;
• a vibration damping member which is densely filled in said hollow portion and is adapted to damp vibration in a shearing direction of said laminated body by absorbing vibrational energy in the shearing direction of said laminated body;
• and
• a first closure member which closes one end in the laminated direction of said hollow portion and has a first flow guiding concave surface which comes into contact with one end portion in the laminated direction of said vibration damping member, in order to guide and assist plastic flow of said vibration damping member at one end portion in the laminated direction of said hollow portion in deformation of said vibration damping member due to the vibration in the shearing direction of said laminated body,
• said hollow portion being defined by inner peripheral surfaces of the elastic layers and the rigid layers and by the first flow guiding concave surface,
• wherein said hollow portion includes a quadrangular prism-like hollow portion defined by the inner peripheral surfaces of the elastic layers and the rigid layers and a semicolumnar hollow portion defined by the first flow guiding concave surface, and the first flow guiding concave surface has a semicylindrical concave surface.

A seismic isolation apparatus comprising:

• a laminated body having alternately laminated elastic layers and rigid layers;
• a hollow portion provided in an interior of said laminated body in a hermetically closed manner and extending in a laminated direction;
• a vibration damping member which is densely filled in said hollow portion and is adapted to damp vibration in a shearing direction of said laminated body by absorbing vibrational energy in the shearing direction of said laminated body;
• and
• a first closure member which closes one end in the laminated direction of said hollow portion and has a first flow guiding concave surface which comes into contact with one end portion in the laminated direction of said vibration damping member, in order to guide and assist plastic flow of said vibration damping member at one end portion in the laminated direction of said hollow portion in deformation of said vibration damping member due to the vibration in the shearing direction of said laminated body,
• said hollow portion being defined by inner peripheral surfaces of the elastic layers and the rigid layers and by the first flow guiding concave surface,
• wherein said hollow portion includes a quadrangular prism-like hollow portion defined by the inner peripheral surfaces of the elastic layers and the rigid layers and a rectangular base-shaped hollow portion defined by the first flow guiding concave surface, and the first flow guiding concave surface has a pair of semicylindrical concave surfaces and a flat surface connected continuously to each of the pair of semicylindrical concave surfaces.