CORROSION PROTECTED TRACTION BAR, FOR ANCHORING IN HARD ROCKS LIKELY TO BE PRE-STRESSED

摘要

The invention consists of a traction bar for anchoring in hard rocks which can be prestressed, the connection between the traction bar and the wall of the borehole being constituted by a synthetic resin glue, said traction bar being arranged with a view to lasting protection against corrosion and to maintaining its extensibility in the zone of the free length, over its entire length, in a casing 3 made of corrosion-resistant material, the hollow space located between the bar of pull 1 and the casing 3 being filled by injection with a hardenable material 14. Inside the casing 3 is introduced from the end located on the free air side of the draw bar 1 and up to 'at the start of the anchoring length a deaeration pipe 9. In the transition zone 5 located between the anchoring length and the free length is provided a retaining device 6 for synthetic resin adhesive which protrudes in the manner of 'a bead the periphery external era.