Joining of tube-formed expansion bolt

Details Joining of tube-formed expansion bolt Joining of tube-formed expansion bolt

E - Fixed Constructions

21

D

E21D 21/00 (2006.01)

Patent

CA 2246996

Tube-formed rock bolt intended for expansion into contact with the wall in a bore hole without stretching the periphery of the rock bolt. The rock bolt comprises an elongated tube (12) with closed cross section. The tube is provided with a longitudinal depressed part (13). End pieces (14, 24) are secured to the ends of the tube. Rock bolts according to the invention can be connected to arbitrary length through screwing them together. The end pieces are provided with axial channels (15, 35) whose peripheries sealingly cooperate through deformation of the material when the rock bolts are screwed together. Through connecting one end (30) of the assembled rock bolt to a high pressure pump (39) the entire assembled rock bolt can be expanded at the same time.

L'invention concerne un élément pour ancrage dans la roche, formé de pièces tubulaires et capable de se dilater et de venir en contact avec la paroi d'un trou de forage, sans étirage de sa périphérie. Chaque pièce comprend un tube allongé (12) à section transversale fermée. Le tube a une partie longitudinale en creux (13). Des embouts (14, 24) sont fixés aux extrémités du tube. Les pièces selon l'invention peuvent être assemblées jusqu'à une longueur quelconque, en les vissant ensemble. Les embouts ont des canaux axiaux (15, 35) dont les périphéries coopèrent d'une manière étanche par déformation du matériau quand les pièces sont vissées ensemble. En reliant une extrémité (30) de l'élément d'ancrage à une pompe à haute pression (39), on peut provoquer la dilatation simultanée de tout l'élément.

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