Drilling tool for underground big pipeline shed

The utility model discloses a concentric hole extending sleeve pipe following drill, which is suitable for the strengthening of advanced protection and the construction of big pipe shed in the underground engineering, such as a railway tunnel, etc. The utility model is characterized in that a leadin...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	DINGZHENG YU
Format:	Patent
Sprache:	eng
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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