Tubeformed rock bolt

Details Tubeformed rock bolt Tubeformed rock bolt

E - Fixed Constructions

21

D

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

Patent

CA 2191760

Tubeformed rock bolt with closed cross section. The rock bolt comprises a tube (11) provided with a longitudinal depression (12). The tube is at the ends provided with a first sleeve (14) and a second sleeve (13). The sleeves are welded to the tube (11) so that a closed room (23) is created. The second sleeve (13) is provided with a radial groove (20) for giving the rock bolt a predetermined angular position in a tool used for setting the bolt and a first hole (18) for injection of cement. The tube (11) is furthermore provided with a second hole (19) near a first end (21). This hole is a venting hole for the closed room (23).

Boulon d'ancrage tubulaire de section fermée. Ce boulon d'ancrage comprend un tube (11) pourvu d'une dépression longitudinale (12), et, à ses extrémités, d'un premier (14) et d'un second (13) manchon. Ces manchons sont soudés au tube (11) de façon à créer une chambre fermée (23). Le second manchon (13) est doté d'une rainure radiale (20), permettant au boulon d'ancrage d'adopter une position angulaire prédéterminée dans un outil utilisé pour placer le boulon, ainsi que d'un premier trou (18) destiné à l'injection du ciment. Le tube (11) est en outre doté d'un second trou (19), à proximité d'une première extrémité (21), qui agit comme trou d'évacuation d'air de la chambre fermée (23).

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