Rock bolting method and rock bolt

Details Rock bolting method and rock bolt Rock bolting method and rock bolt

E - Fixed Constructions

21

D

E21D 21/00 (2006.01)

Patent

CA 2564291

A method for providing a rock bolt (2) for rock bolting, wherein a rock bolt (2) having a tubular bolt portion (4) with a closed cross section is inserted and expanded for bearing contact in a bore hole (3) in a rock structure (1). The length of the tubular bolt portion (4) is determined such that maximum frictional force at pulling inside a bore hole (3) of a rock bolt with a tubular bolt portion with this length is below a predetermined maximum value. The invention also concerns a rock bolt.

L'invention concerne un procédé de fabrication d'un boulon d'ancrage (2) destiné au boulonnage, comprenant une partie tubulaire (4) présentant une section transversale fermée et introduit et étendu en contact support dans un trou de forage (3) dans une structure rocheuse (1). La longueur de la partie tubulaire (4) du boulon est déterminée de manière qu'une force de frottement maximale lors de la traction à l'intérieur du trou de forage (3) d'un boulon d'ancrage comprenant une partie tubulaire de cette longueur soit inférieure à une valeur maximale prédéterminée. L'invention concerne également un boulon d'ancrage.

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