Abstract:
PROBLEM TO BE SOLVED: To provide a bearing device for a bridge capable of achieving reductions in thickness, size, and cost thereof, and dealing with compressive load of a superstructure at an occurrence of an earthquake.SOLUTION: A bearing device which is arranged between a substructure 3 and a superstructure 2 comprises: a base plate 4 which is fixed to the substructure by fixing bolts 6 and provided with a central through-hole 4a; a sole plate 7 which is fixed to the superstructure and provided with a fitting concave section 7a; a rubber layer 10 which is arranged inside the central through-hole or the fitting concave section, has a space at a side thereof to enable the rubber layer to expand thereinto, and has flat surfaces on both top and bottom faces; and a steel member which contacts with one of the flat surfaces either on the top face or the bottom face of the rubber layer, is positioned between the central through-hole and the fitting concave section, creates a prescribed gap between a top surface of the base plate and a bottom surface of the sole plate, and regulates horizontal movement between the superstructure and the substructure. The steel member also has a through-hole 11 or a concave section 12 on the surface where the steel member contacts with the rubber layer.
Abstract:
PROBLEM TO BE SOLVED: To provide a bridge fall preventing device with a displacement limiting function for a bridge by which the device as a whole is made compact, the construction cost is reduced, and the appearance is prevented from being spoiled. SOLUTION: The bridge fall preventing device 1 with the displacement limiting function for the bridge includes a displacement limiting mechanism comprising a first member 8, a second member 14, and a displacement limiting plate 19. The first member 8 arranged on either an upper structure 2 or a lower structure 3 has a long hole 11 extending in the direction of a bride axis. The second member 14 is arranged on the other one of the upper structure 2 and the lower structure 3, and is provided with a pin 15 having an end penetrating the long hole 11 and relatively movable along the long hole 11. A lift force stopping member 17 having a diameter larger than the width of the long hole 11 is fixed to the end of the pin 15 penetrating the long hole 11. The displacement limiting plate 19 has a relatively movable distance between the first member 8 and the second member 14, which is shorter than the relatively movable distance corresponding to the length of the long hole in the direction of the bridge axis. When stress is loaded by horizontal displacement exceeding a predetermined value, the relatively movable distance in the direction of the bridge axis is increased. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a bearing apparatus capable of securing the miniaturization of the apparatus and high damping property with simple structure. SOLUTION: The bearing apparatus 1 has a first sliding member 11 formed with a first sliding surface 12 formed of a downward convex surface arranged at an upper structure 2; a second sliding member 13 formed with a second sliding surface 14 formed of an upward convex surface arranged at a lower structure 6; and a slide transmission member 15 disposed between the first and second sliding members and formed with third and fourth sliding surfaces 16, 17 formed of concave surfaces brought into surface contact with the first and second sliding surfaces at the upper and lower faces. A thin-walled center of the slide transmission member is formed with a through-hole 20 for dispersing vertical stress in case of an earthquake in a thick-walled circumferential direction. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method of and a structure for renewing an existing bearing apparatus capable of easily connecting an existing concrete beam and the existing bearing device and of increasing seismic resistance. SOLUTION: In this method for renewing an existing bearing apparatus, after the existing bearing apparatus of a lower structure is dismounted, the side surfaces and the lower surface of the existing concrete beam of an upper structure are removed beyond the thickness of the covering concrete by chipping to expose reinforcements. A steel mounting member comprising a bottom plate part, both sidewall parts extending vertically from the bottom plate part, and a plurality of reinforcing and fixing ribs projecting beyond the thickness of the covering concrete for covering both sidewall parts is disposed outside the concrete beam. The gap between the concrete beam and the steel mounting member is filled with a solidifying filler, and the solidifying filler is solidified for integration. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an omnidirectional vibration damper of simple structure having higher energy absorption performance even to a big load due to a large scale earthquake. SOLUTION: In the omnidirectional vibration damper, a dimple plate 10, in which an axially continuous irregularity 4 is formed in a surface of a first slide member 2 fixed in one side member relatively displaced, the axially continuous irregularity 4 is formed in a surface of a second slide member 3 extending in a direction crossed at right angles with the first slide member fixed in the other side member relatively displaced, an irregularity 11 engaged with irregularity formed in the first slide member is formed in one side surface at a cross section between the first and the second slide members, and irregularity 12 engaged with irregularity formed in the second slide member is formed in the other side surface, is arranged through a retainer 10 with elastic members 14 and 15 arranged, furthermore the first and the second slide members are slidable through the dimple plate. COPYRIGHT: (C)2009,JPO&INPIT