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トンネル建設工事の工法等について - mhlw.go.jp

Ministry of Health, Labour and Welfare 28 11 30 28 1 1 2 1 NATM NATM 2 ( or ( ) ( ( ) ) ( ) ( ) ( ) ) ( ( , )1m 24 4 5m ( ) NATM NATM 3 3 I.)

山岳工法(NATM工法)における一般的な作業工程について 2 資料提供:前田建設工業株式会社 ①穿孔・発破(発破掘削)or 切削・掘削(機械掘削)

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