Self-drilling connection anchor

Abstract

A self-drilling connection anchor ( 10 ) includes an anchor tube ( 11 ), a drilling head ( 13 ) provided at the first end ( 12 ) of the anchor tube ( 11 ), an inner tube ( 15 ) arranged in the anchor tube ( 11 ) and having an interior space ( 16 ) for receiving an ejectable mass ( 30 ), a first axial, with respect to the longitudinal axis (L) defined by the anchor tube, opening ( 18 ) provided in a region of the second free end ( 14 ) that communicates with the interior space ( 16 ) of the inner tube ( 15 ), at least one outlet opening ( 20 ) provided in a region of the drilling head ( 13 ), and at least one second radial, with respect to the longitudinal axis (L), opening ( 19 ) provided in the region of the free second end ( 14 ) and communicating with the at least one outlet opening ( 20 ) via an intermediate space ( 17 ) formed between the anchor tube ( 11 ) and the inner tube ( 15 ).

1 . A self-drilling connection anchor ( 10 ) for use in mining and tunneling, comprising an anchor tube ( 11 ) defining a longitudinal axis (L) and having a first end ( 12 ) and a free second end ( 14 ); a drilling head ( 13 ) provided at the first end ( 12 ); an inner tube ( 15 ) arranged in the anchor tube ( 11 ) and having an interior space ( 16 ) for receiving an ejectable mass ( 30 ); a first axial, with respect to the longitudinal axis (L), opening ( 18 ) provided in a region of the second free end ( 14 ) that communicates with the interior space ( 16 ) of the inner tube ( 15 ); at least one outlet opening ( 20 ) provided in a region of the drilling head ( 13 ); and at least one second radial, with respect to the longitudinal axis (L), opening ( 19 ) provided in the region of the free second end ( 14 ) of the anchor tube  11  and communicating with the at least one outlet opening ( 20 ) via an intermediate space ( 17 ) formed between the anchor tube ( 11 ) and the inner tube ( 15 ). 
   
   
       2 . A connection anchor according to  claim 1 , comprising two opposite radial second openings ( 19 ). 
   
   
       3 . A connection anchor according to  claim 1 , wherein the at least one second radial opening ( 19 ) is provided in the anchor tube ( 11 ). 
   
   
       4 . A connection anchor according to  claim 1 , wherein the at least one radial second opening ( 19 ) is spaced from the free second end ( 14 ) of the anchor tube ( 11 ) by a distance (A) corresponding to from 0.5 to 2 times of an anchor tube diameter (D).