kaidan 階段
KEY WORD : architecture / general terms
One or more steps composed of a tread dan-ita 段板 or fumi-ita 踏板 and a riser *keage 蹴上 or kekomi-ita 蹴込板. Stairs, a stairway, a staircase, or a flight of stairs which allow access to a veranda or connect two or more stories. Kaidan are secured by an inclined board or boards, nakageta 中桁, (also called carriages or carriage pieces) to support strings or stringers kawagi 側木 which are cut so that the risers can be a fixed to the sloping side planks kawa-ita 側板. The treads are then laid across and secured. The edge of the tread that extends beyond the riser is called the nosing *fumizura 踏面. Stairways are sometimes divided by a landing odoriba 踊場, because the stairs change direction or the flight is abnormally long. *Danbashigo 段梯子 also means steps, but it refers to simple steps such as step-ladders, hashigo 梯子 and hashigodan 梯子段 or *sarubashigo 猿梯子 (monkey ladder), and boxed steps hakohashigo 箱梯子. *Ichiboku kaidan 一木階段 are ladder type steps hewed from a single log, known to have been used during the Yayoi period. *Koguchi kaidan 木口階段 are steps made of thick heavy square or rectangular timbers with the cut ends exposed. One step is called dangi 段木.They are cut in the lengthwise direction of the grain, i.e. , along the grain. Sometimes the treading surface is faced by a thick board. Such steps are common at shrines, temples, and palaces.

*hakokaidan 箱階段, *sasarageta 簓桁

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