Hollow rock bolt, self -drilling rock bolt and method of...

Details Hollow rock bolt, self -drilling rock bolt and method of... Hollow rock bolt, self -drilling rock bolt and method of...

E - Fixed Constructions

21

D

E21D 21/00 (2006.01) E21D 20/02 (2006.01)

Patent

CA 2695766

A hollow rock bolt comprising a shaft having a spiral form protruding from the exterior surface of the shaft, wherein the spiral form has a flank angle of between 30° and 60°.

L'invention porte sur un boulon d'ancrage creux comprenant un arbre ayant une forme en spirale qui fait saillie à partir de la surface extérieure de l'arbre, la forme en spirale ayant un angle de flanc entre 30° et 60°.

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