A friction bolt assembly (1) comprises a friction bolt (2) with a pre-formed elongate column (3) of flexible, solid material retained within, and extending along a cavity (4) defined by the body (5) of the friction bolt (2). The body (5) of the friction bolt (2) is generally cylindrical and has a split (6) extending along its length.
申请公布号
WO2009023922(A1)
申请公布日期
2009.02.26
申请号
WO2008AU01220
申请日期
2008.08.20
申请人
DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITED;EVANS, DAVID, WILLIAM;HIRD, DEREK, COLIN;BOYCHUK, ANDREW, SIMON
发明人
EVANS, DAVID, WILLIAM;HIRD, DEREK, COLIN;BOYCHUK, ANDREW, SIMON
