BORING DEVICE

PROBLEM TO BE SOLVED: To provide a boring device enabling the replacement of the cutting edge of a casing metal without pulling back a casing pipe to the ground and capable of increasing drilling efficiency by preventing the back-filling of an excavated portion. SOLUTION: A base stage tip block 34,...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	NAGATOMO NOBUHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING EMBANKMENTS EXCAVATIONS FIXED CONSTRUCTIONS FOUNDATIONS HYDRAULIC ENGINEERING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS SOIL SHIFTING UNDERGROUND OR UNDERWATER STRUCTURES
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