DE2936060

The earth borer, (100) produces bore holes for cast-in-place concrete piles. It consists of a hollow drill head of conical shape with spiral steps on its outside. A drill tube is inserted in its open end where it engages serrated inner teeth with serrated teeth on its leading edge. Packing material...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	VERSTRAETEN, ALEXANDER JULIEN, ST. KRUIS, NL
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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