Wet sprayed concrete for supporting purposes during the drive, in situ concrete for the up to 3 m thick Base and for lining the vault.
掘进过程中的支护采用湿喷混凝土,3米厚的基底和穹拱衬砌采用浇注混凝土。
Wet sprayed concrete for supporting purposes during the drive, in situ concrete for the up to 3 m thick Base and for lining the vault.
掘进过程中的支护采用湿喷混凝土,3米厚的基底和穹拱衬砌采用浇注混凝土。
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