SLIDING BASE ISOLATION DEVICE AND BRIDGE

To provide a sliding base isolation device capable of exerting suitable functions depending on respective earthquake levels and capable of inhibiting an upper structure and lower structure from being damaged at the time of a large earthquake, and a bridge comprising the sliding base isolation device...

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Hauptverfasser: YAMAZAKI SHINSUKE, NORO TADAYUKI
Format: Patent
Sprache:eng ; jpn
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Beschreibung
Zusammenfassung:To provide a sliding base isolation device capable of exerting suitable functions depending on respective earthquake levels and capable of inhibiting an upper structure and lower structure from being damaged at the time of a large earthquake, and a bridge comprising the sliding base isolation device, especially, as a fixed bearing.SOLUTION: A sliding base isolation device 40 including an upper shoe 41 and lower shoe 42 and a slider 48 slidable between the shoes includes a pair of movement direction limitation jigs 45 across the upper shoe 41 and lower shoe 42. The pair of movement direction limitation jigs are fixed on one of the upper shoe 41 or lower shoe 42 using knockoff bolts 60 having breaking parts 64 that are broken when horizontal force equal to or larger than a first predetermined value is applied, and are not fixed on the other of the upper shoe 41 or lower shoe 42. When the knockoff bolts 60 are not broken, a relative movement direction of the upper shoe 41 to the lower shoe 42 is limited by the pair of movement direction limitation jigs 45. When the knockoff bolts 60 are broken, the relative movement direction of the upper shoe 41 to the lower shoe 42 is not limited.SELECTED DRAWING: Figure 3 【課題】各地震レベルに応じて好適な機能を発揮することができ、大地震時における上部構造体や下部構造体の破損を抑止することのできる滑り免震装置と、この滑り免震装置を特に固定支承に備えてなる橋梁を提供すること。【解決手段】上沓41及び下沓42と、それらの間でスライド自在なスライダー48とを有する滑り免震装置40であり、上沓41と下沓42に跨る一対の移動方向規制治具45は、上沓41と下沓42のいずれか一方に対して、第一所定値以上の水平力が作用した際に破断される破断部64を備えたノックオフボルト60によって固定され、上沓41もしくは下沓42の他方に対して固定されておらず、ノックオフボルト60が破断していない場合は、下沓42に対する上沓41の相対移動方向が一対の移動方向規制治具45によって規制され、ノックオフボルト60が破断した際には、下沓42に対する上沓41の相対移動方向が規制されない。【選択図】図3