EXCAVATING DEVICE AND METHOD

PROBLEM TO BE SOLVED: To erect a casing pipe, particularly in a soft layer such as a mudstone layer or soft rock layer, without using a diameter-increasing bit. SOLUTION: A stepped part 16 that is one step smaller in diameter than the rear end of the inner peripheral part of a casing pipe 13 is form...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	SABURI AKIHIRO, TOFUN KAZUO, SATO SHIGERU
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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