- drop-shaft sinking
-
погружение крепи
English-Russian dictionary of geology. 2011.
English-Russian dictionary of geology. 2011.
Shaft construction — concerns the building of vertical openings such as Raises and Shafts. Shafts are vertical openings used for supplying equipment, personnel, and support systems to the horizontal tunnel where the pipeline is installed. They can be temporary or… … Wikipedia
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