STAIR INSTALLATION METHOD

PROBLEM TO BE SOLVED: To provide a stair installation method, by which a structure is easily simplified and a stair unit is early and easily secured as a passage for work.SOLUTION: A stair unit B made of precast concrete includes: an upper end part 2 supported by an upper end support part 4 of a structure A; and a lower end part 3 supported by a lower end support part 8 of the structure A. In a stair installation method, the upper end part 2 is rigidly joined with the upper end support part 4 and the lower end part 3 is supported by the lower end support part 8 via a slide bearing 9. Against movement of the lower end part 3 in a direction in which the upper end part 2 mounted on the upper end support part 4 falls off from the upper end support part 4, a propping tool 11 performing propping action from downstream of the movement direction is installed across the lower end part 3 and a reaction receiving part 12 of the structure A. 【課題】構造の簡略化を図り易く、階段ユニットを作業用通路として早期に確保し易い階段設置方法を提供する。【解決手段】プレキャストコンクリート製の階段ユニットＢが、構造体Ａの上端支持部４に支持される上端部分２と、構造体Ａの下端支持部８に支持される下端部分３とを備え、上端部分２を上端支持部４に剛接合すると共に、下端部分３を下端支持部８に滑り支承９を介して支持する階段設置方法であって、上端支持部４に載置した上端部分２が当該上端支持部４から脱落する方向への下端部分３の移動に対して、移動方向下手側から突張作用する突張具１１を、当該下端部分３と構造体Ａの反力受け部１２とに亘って装着する。【選択図】図１