SEISMIC ISOLATION METHOD, AND SEISMIC ISOLATION STRUCTURE

To safely perform construction by enhancing a strength against a horizontal external force acting on a building under construction while facilitating the construction of seismic isolation work.SOLUTION: There is provided a seismic isolation method in which a seismic isolation device is provided between an upper structure and a lower structure. The upper structure has: an upper horizontal portion; a first upper protruding portion that protrudes downward from the upper horizontal portion and is arranged at an interval in a first direction; and a second upper protruding portion. The lower structure has: a lower horizontal portion; a first lower protruding portion that protrudes upward from the lower horizontal portion and is arranged at an interval in the first direction; and a second lower protruding portion. Between the first upper protruding portion and the second upper protruding portion, and between the first lower protruding portion and the second lower protruding portion, there is provided a horizontal competition member installation step of installing a horizontal competition member that opposes a horizontal force in the first direction along the first direction.SELECTED DRAWING: Figure 3 【課題】免震化工事の施工を容易にしつつ、施工中に建物に作用する水平外力に対する耐力を高めて安全に施工すること。【解決手段】上部構造と下部構造の間に免震装置を設ける免震化工法であって、上部構造は、上部水平部と、上部水平部から下方に突出し、かつ、第１方向に間隔を空けて配された第１上部突出部、及び、第２上部突出部と、を有し、下部構造は、下部水平部と、下部水平部から上方に突出し、かつ、第１方向に間隔を空けて配された第１下部突出部、及び、第２下部突出部と、を有し、第１上部突出部と第２上部突出部との間であり、かつ、第１下部突出部と第２下部突出部との間に、第１方向の水平力に対抗する水平対抗部材を第１方向に沿って設置する水平対抗部材設置工程を有することを特徴とする免震化工法。【選択図】図３