Abstract: A finger joint having a bridging cover plate, which enables a steel plate having a thickness much smaller than that of a conventional finger to be used and allows the vertical rotation of an upper bridge structure. The finger joint includes: a bridging cover plate installed on a first structure and supported to a second structure across a gap so as to support a load of a vehicle passing over the gap, and configured to allow relative movement between the first structure and the second structure in a direction in which the distance of the gap changes; a first finger unit connected to the bridging cover plate; and a second finger unit installed on the second structure so as to allow relative movement relative to the first finger unit in a direction in which the distance of the gap changes.

Abstract: A spherical bearing is disclosed, which is easy to make, can be made small, and does not have a sticking problem of a spherical block. The spherical bearing includes a plastic spherical block made of plastic and including a convex spherical surface, a spherical groove member including a spherical groove with which the convex spherical surface engages and surface-contacts and allowing rotation with respect to the plastic spherical block, and a weight-delivering member installed opposite to the spherical groove member with the plastic spherical block in the middle, and wherein a frictional surface of the plastic spherical block rubbing against the spherical groove member or the weight-delivering member is made of engineering plastic such as PA, POM etc. having a hardness of 75D through 95D.

Abstract: A spherical bearing is disclosed, which is easy to make, can be made small, and does not have a sticking problem of a spherical block. The spherical bearing includes a plastic spherical block made of plastic and including a convex spherical surface, a spherical groove member including a spherical groove with which the convex spherical surface engages and surface-contacts and allowing rotation with respect to the plastic spherical block, and a weight-delivering member installed opposite to the spherical groove member with the plastic spherical block in the middle, and wherein a frictional surface of the plastic spherical block rubbing against the spherical groove member or the weight-delivering member is made of engineering plastic such as PA, POM etc. having a hardness of 75D through 95D.

Abstract: The disclosed seismic isolation bearing includes an upper base plate, a lower base plate, a disc bearing core, and at least one shear spring. The upper and lower base plates each have an upper surface and a lower surface. The disc bearing core is centrally positioned with respect to the planes of the upper and lower base plates and is in contact with the lower surface of the upper base plate and the upper surface of the lower base plate, where the disc bearing core allows the lower surface of the upper base plate to slide along the disc bearing core. The shear spring is coupled to the lower surface of the upper base plate and the upper surface of the lower base plate, deforms in shear upon lateral movement of the upper base plate relative to the lower base plate, and exerts a lateral return force on the upper base plate when laterally displaced.

Abstract: The disclosed seismic isolation bearing includes an upper base plate, a lower base plate, a disc bearing core, and a shear spring surrounding the disc bearing core. Concave recesses are formed in a lower surface of the upper base plate and an upper surface of the lower base plate. The disc bearing core is centrally positioned with respect to the planes of the upper and lower base plates and can slide along the recesses of the upper and lower base plates, where the recesses exert a lateral return force on the disc bearing core when displaced from a central position. The shear spring surrounds the disc bearing core, deforms in shear upon lateral movement of the upper base plate relative to the lower base plate, and exerts a lateral return force on the upper base plate when the upper base plate is laterally displaced.

Abstract: A unitary compound earthquake isolation bearing which permits the installation of a compound bearing comprising a sliding bearing and at least one MER as a single unit without special and separate attachment of the MER to the support or superstructure.