Patent ID: 9051831
Filing Date: 2015-06-09
Classification: E21D,Y10T

Abstract:
1. A tubular rock bolt ( 1 ) that can be expanded by a pressurized medium, for insertion into a drilled hole ( 16 ) and comprising an extended tubular part ( 2 ) with a closed cross-section ( 12 ) and provided with a longitudinal stamped part ( 13 ) that increases in diameter during the expansion of the rock bolt ( 1 ) without the periphery of the tubular part ( 2 ) being bent, and an end section ( 17 ) at one end ( 15 ) of the rock bolt ( 1 ) and an end piece ( 19 ) arranged at the second end ( 18 ) of the rock bolt ( 1 ) and provided with a connection part ( 22 ) for interaction in a manner that can be released with an expansion means ( 23 ), characterised in that the extended tubular part ( 2 ) comprises a reinforcement means ( 3 ) that extends internally inside the tubular part ( 2 ) between the end section ( 17 ) and the end piece ( 19 ) and that is attached at the end section ( 17 ) and the end piece ( 19 ).