Hole gas drainage pipe prevents collapsing and connecting piece thereof

The utility model discloses a hole gas drainage pipe prevents collapsing and connecting piece thereof, its technical scheme's main points are: take out the bonding portion of putting between the pipe including locating two, the both ends of bonding portion are equipped with the cladding respect...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	BAI CUNLONG, YAN PENGBIN, HAO YANFANG, ZHANG YINGLI
Format:	Patent
Sprache:	chi ; 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 SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS
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