A method of pre-stressing a tendon

E - Fixed Constructions – 21 – D

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

Patent

CA 2267163

A tendon (10) is installed in a hole (34) in a mine hanging wall (36) by making use of a barrel (14) and a wedge arrangement (16). One end of the tendon is anchored in the hole (34) such that the other end protrudes therefrom. The barrel (14) is positioned over the protruding end of the tendon (10). A tensioning jack applies a tensile load to the tendon (10) and an oppositely disposed load to a shear ring (20) of the barrel. When the desired preload is reached, the shear ring (20) fails permitting the tensioning jack (40) to displace wedge elements (30) of the wedge arrangement (16) inwardly thereby locking the barrel on the tendon and maintaining the desired preload in the tendon.

On installe un câble de précontrainte (10) dans un orifice (34) pratiqué dans le toit (36) d'une mine, au moyen d'un ensemble à cloche (14) et coins (16). On ancre une extrémité du câble de précontrainte dans l'orifice (34) de sorte que l'autre extrémité saille de celui-ci. On place la cloche (14) sur l'extrémité saillante du câble de précontrainte (10). On applique, au moyen d'un vérin de mise en tension, un effort de traction sur le câble de précontrainte (10) et une charge située à l'opposée sur une bague de cisaillement (20) de la cloche. Lorsque l'on atteint la précontrainte voulue, la bague de cisaillement (20) empêche le vérin de mise en tension (40) de déplacer vers l'intérieur les éléments coins (30) du système de coins (16), ce qui bloque la cloche sur le câble de précontrainte et permet de maintenir la précontrainte voulue dans ledit câble.

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