| 摘要 |
PURPOSE:To enhance the frictional force of an anchor by a method in which an anchor whose cylindrical periphery is ?-shaped notches having upward and downward basal portions and linear notches, having a driving head, is driven into a banking, etc., and the peripheral portions of the notches are expanded. CONSTITUTION:An anchor A consists of a cylinder 1 and a driving head 5 fixed to the lower end opening of the cylinser 1. The peripheral wall of the cylinder 1 is provided with plural ?-shaped upward notches 21, downward notches 31, and nearly linear notches 4. The anchor A is driven into a banking 8 through the hole 7 of a retaining wall 6, and an expansible agent 9 is injected into the upper end opening of the anchor A until it reaches the positions of the notches 21, 31, and 4, whereupon the expansible agent 9 expands and hardens and the ?-shaped notches 22 and 23 are erected by the expanding pressure of the agent 9, and also as the notches 4 expand, the peripheral portion of the cylinder 1 is expanded. By this, a drawing resistance and a frictional force are conferred upon the anchor A. |
