Tension anchors for cohesive soils - has several vanes arranged at bottom end of bore tube producing expanded cavity

摘要

Device for producing tension anchors in cohesive soils where several vanes are arranged at the bottom end of the bore tube and these vanes and the bore tube produce a star-shaped expanded cavity and hold this open also on drawing the drill tube for the expansion of the simultaneously introduced compression cement. Using this method, the anchor is fixed in the ground without the need for auxiliary means. Typically four vanes are used spaced apart from each other by ninety degrees. The width of each vane from the surface of the bore tube in an outwards direction is approximately equal to the radius of the bore tube. The length of each vane is approximately equal to six times its width.