A rock bolt is disclosed, which includes first and second ends, a shaft extending between the ends, the shaft incorporating a hollow metal rod including at least one breaking zone and wherein the shaft is arranged to preferentially break in the breaking zone when impact loading is applied to the shaft.
申请公布号
WO2008051728(A3)
申请公布日期
2008.07.03
申请号
WO2007US81077
申请日期
2007.10.11
申请人
JENNMAR CORPORATION;GAUDRY, TIMOTHY, J.;CRAIG, PETER, H.