FRICTION BOLT

A friction bolt (10), for frictionally engaging the internal surface of a bore drilled into a rock face. The friction bolt comprises an elongate, generally circular tube (11) which is expandable radially. The tube has a leading end (12) and a trailing end (13). An expander mechanism (14) is disposed...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	RATAJ, Mieczyslaw
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	EARTH DRILLING FIXED CONSTRUCTIONS GALLERIES LARGE UNDERGROUND CHAMBERS MINING SHAFTS TUNNELS
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