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Ear wall formula open cut tunnel structure of stake board formula
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Connection structure of sluicing cave and main tunnel
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Underground water and harmful gas separation bin with air sealing device
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Long rock pillar construction method suitable for overlying thin rock stratum
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A kind of clip chain self-sealing overlap joint anchor bar of waterproof plate in tunnels
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The ruggedized construction and construction method of existing railway are worn under Large span tunnel
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