NUT FOR ROCK BOLT

PURPOSE: To shorten the projected length of a rock bolt. CONSTITUTION: A rock bolt 20 is driven into a bore hole drilled in the natural ground and, then, the shaft section 42 of a nut 40 is loosely inserted in the round hole 31 of a washer 30. In this state, the internal thread section 41 of the nut...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	HANEUMA TORU
Format:	Patent
Sprache:	eng
Schlagworte:	EARTH DRILLING FIXED CONSTRUCTIONS GALLERIES LARGE UNDERGROUND CHAMBERS MINING SHAFTS TUNNELS
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