水道管掘削幅の計算 - saiei-design.com

水道管掘削幅の計算管種：ダクタイル鋳鉄管k型管径外径受口外径 (d) (d2) (d5) 吊込み接合作業矢板腹起し土留有土留無土留有土留無土留有土留無

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