multiple days offとは 意味・読み方・使い方

Before a structural skeleton of an underground structure is constructed, a waterproof construction is performed to form a water cut-off layer on a bored earth-retaining wall by spraying a fiber reinforcement cement composite with multiple fine cracks (HPFRCC) exhibiting a tensile strain of 1% or more at a material age of 28 days to a thickness of 5 to 150 mm.例文帳に追加

地中構造物躯体を構築する前に、掘削した山留め壁面に防水工として、材齢２８日で１％以上の引張歪みを示すクラック分散型のＨＰＦＲＣＣ（複数微細ひび割れ型繊維補強セメント複合材料）を厚さ５〜１５０ｍｍに吹き付け施工して止水層を形成する。 - 特許庁