Anchor Fastening Element

Abstract

Anchor fastening element for fastening an object to a wall having a drilled hole, which comprises a threaded bolt having a threaded portion at one end and an anchor portion at the other end and also having a shank portion in between. The threaded portion and the anchor portion have a low ductility and the shank portion has a higher ductility.

1 . An anchor fastening element for fastening an object in a drilled hole of a concrete part as an anchoring base, which is to absorb impact loads such as those occurring during earthquakes in an energy dissipating manner, comprising:
 a threaded bolt having a threaded portion at a first end, an anchor portion at the other, second end, and a shank portion between the threaded portion and the anchor portion; and   a nut to be screwed on the threaded portion; wherein   the threaded portion and the anchor portion on the one hand and the shank portion on the other exhibit a different ductility behavior, the threaded portion and the anchor portion having a lower ductility with less plastic deformation capacity, and the shank portion having a higher ductility with higher plastic deformation capacity,   and wherein the shank portion finds a radial clearance within the drilled hole near the threaded portion, which is sufficiently large to allow for a plastic deformation corresponding to a global ductility of greater than 1.5 based on a stretching ductility and a bending ductility of the shank portion when the latter is clamped in the drilled hole due to the anchor portion.   
     
     
         2 . The anchor fastening element as claimed in  claim 1 , wherein the shank portion has a reduced cross section as compared to that of the threaded portion. 
     
     
         3 . The anchor fastening element as claimed in  claim 1 , wherein the global ductility ranges from 2 to 4. 
     
     
         4 . The anchor fastening element as claimed in  claim 1 , wherein the global ductility is greater than 4. 
     
     
         5 . The anchor fastening element as claimed in  claim 1 , which is formed as an adhesive anchor, wherein the anchor portion can be fastened adhesively in the drilled hole. 
     
     
         6 . The anchor fastening element as claimed in  claim 1 , wherein a cylindrical anchor sleeve is provided, which has a round cross section and spreading segments at the end of the anchor sleeve adjacent the anchor portion, to complete the anchor fastening element into a spreading anchor. 
     
     
         7 . The anchor fastening element as claimed in  claim 6 , wherein the anchor sleeve has a thickened wall in the region of the spreading segments, which at least partially engages the anchor portion, in order to obtain a spreading of the spreading segments during installation of the spreading anchor by a relative axial displacement between the anchor sleeve and the anchor portion. 
     
     
         8 . The anchor fastening element as claimed in  claim 1 , wherein the threaded bolt is made of wrought iron steel which remains unhardened in the region of the shank portion. 
     
     
         9 . The anchor fastening element as claimed in  claim 1 , wherein the threaded bolt is made of a copper alloy which has been hardened in the region of the threaded portion and the anchor portion. 
     
     
         10 . The anchor fastening element as claimed in  claim 1 , wherein the anchor portion is cone-shaped and has a shoulder towards the shank portion, which comprises a material harder than that of the shank portion. 
     
     
         11 . An anchor fastening element for fastening an object in a drilled hole of a concrete part as an anchoring base, which is to absorb impact loads such as those occurring during earthquakes in an energy dissipating manner, comprising:
 a threaded bolt having a threaded portion at a first end, an anchor portion at the other, second end, and a shank portion between the threaded portion and the anchor portion; and   a nut to be screwed on the threaded portion; wherein   the threaded portion and the anchor portion on the one hand and the shank portion on the other exhibit a different ductility behavior, the threaded portion and the anchor portion having a lower ductility with less plastic deformation capacity, and the shank portion having a higher ductility with higher plastic deformation capacity,   and wherein the anchor portion is an anchor body separate from the threaded bolt, which cooperates with a screw thread on the second end of the threaded bolt.   
     
     
         12 . A building wall anchor fastening element for absorbing impact overloads, wherein the fastening element comprises:
 a threaded bolt having
 a threaded portion at a first end, 
 an anchor portion at a second end, and 
 a shank portion between the threaded portion and the anchor portion, 
 wherein shank and threaded portions are of monolithic construction, and the threaded portion and the anchor portion are harder than the shank portion. 
   
     
     
         13 . The building wall anchor fastening element as claimed in  claim 12 , wherein the threaded bolt is made of wrought iron steel or a copper alloy. 
     
     
         14 . The building wall anchor fastening element as claimed in  claim 12 , wherein the anchor portion is cone-shaped and has a shoulder towards the shank portion. 
     
     
         15 . The building wall anchor fastening element as claimed in  claim 12 , wherein threaded bolt is of monolithic construction. 
     
     
         16 . The building wall anchor fastening element as claimed in  claim 12 , wherein the anchor portion is an anchor body separate from the threaded bolt, which cooperates with a screw thread on the second end of the threaded bolt.