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Phase IV: DMRC completes work on longest underground tunnelA DMRC official said this new tunnel was constructed ... of earth pressure balancing method with a concrete lining made of precast tunnel rings. These tunnel rings were cast at a fully mechanised ...
The Delhi Metro Rail Corporation (DMRC ... with a concrete lining made of precast tunnel rings, the statement said. These tunnel rings were cast at a fully mechanised casting yard set up in ...
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