BRIDGE EXPANSION STRUCTURE AND METHOD OF CONSTRUCTING BRIDGE EXPANSION STRUCTURE

To provide a bridge expansion structure capable of reducing a construction scale and controlling water penetration within a rail joint gap, and a method of constructing the bridge expansion structure.SOLUTION: There is provided a bridge expansion structure 1 buried under a pavement part 9 of a bridge, comprising a rubber structure 2 extending from the top of a floor slab 93 to the top of a parapet 94 of a bridge abutment, and a plate shaped member 3 built into the rubber structure 2, in which the plate shaped member 3 has a first plate shaped member 31, and a second plate shaped member 32, the first plate shaped member 31 being built over a rail joint gap 8 between the floor slab 93 and the parapet 94, the second plate shaped member 32 disposed separately from the first plate shaped member 31 along a bridge shaft direction X perpendicular to an extension direction of the rail joint gap 8, and fixed to the floor slab 93 or the parapet 94 by a fixing member 4.SELECTED DRAWING: Figure 1 【課題】施工規模を小さくするとともに、遊間内への浸水を抑制することができる橋梁伸縮構造及び橋梁伸縮構造の施工方法を提供する。【解決手段】橋梁の舗装部９の下に埋設される橋梁伸縮構造１であって、床版９３の上から橋台のパラペット９４の上まで延伸するゴム構造体２と、前記ゴム構造体２に内蔵された板部材３と、を備え、前記板部材３は、前記床版９３と前記パラペット９４との間における遊間８の上に架設された第１板部材３１と、前記遊間８の伸延する方向と交わる橋軸方向Ｘに沿って前記第１板部材３１と離間して配置され、固定部材４によって前記床版９３又は前記パラペット９４に固定される第２板部材３２と、を有することを特徴とする。【選択図】図１