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更新時(shí)間:2025.05.17
洞身長(zhǎng)管棚施工工藝

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簡(jiǎn)述了福建省南平市嶺根隧道淺埋富水軟弱圍巖段的超前預(yù)支護(hù)施工工法及各施工工序。

洞身長(zhǎng)管棚施工工藝新技術(shù)-最新年文檔

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洞身長(zhǎng)管棚施工工藝新技術(shù) : A new technique for long pipe roofs applied in tunnel barrel instead of the oldstyled technology when it gets through shallowly buried , biased and weak formations was introduced , which means that the aperture and pipe roof will be formed and completed synchronously by using 50 m Φ121 steel tubes to keep in step closely with the drilling bit without cleaning out the hole and

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