Reinforcement bar

Abstract

A reinforcement bar to be embedded in a concrete structure includes a rod segment, a self-tapping segment, and a head. The rod segment defines a central axis. The self-tapping segment extends integrally from one end of the rod segment along the central axis. The head extends integrally from the other end of the rod segment along the central axis, and is operable manually to rotate about the central axis so as to drive the self-tapping segment to drill into the concrete structure.

What is claimed is: 
     
         1 . A reinforcement bar adapted to be embedded in a concrete structure, said reinforcement bar comprising:
 a rod segment defining a central axis;   a self-tapping segment extending integrally from one end of said rod segment along the central axis; and   a head extending integrally from the other end of said rod segment along the central axis, and operable manually to rotate about the central axis so as to drive said self-tapping segment to drill into the concrete structure.   
     
     
         2 . The reinforcement bar as claimed in  claim 1 , wherein said head has a shape of a polygonal prism. 
     
     
         3 . The reinforcement bar as claimed in  claim 2 , wherein said head has a shape of a hexagonal prism. 
     
     
         4 . The reinforcement bar as claimed in  claim 2 , wherein said rod segment has a connecting surface having a central portion from which said head extends, such that a periphery of said connecting surface forms a shoulder of said bar. 
     
     
         5 . The reinforcement bar as claimed in  claim 1 , wherein said rod segment has an abutment surface from which said self-tapping segment extends, such that a periphery of said abutment surface forms a shoulder of said bar that is adapted to abut against an outer surface of the concrete structure when said self-tapping segment is completely drilled into the concrete structure. 
     
     
         6 . The reinforcement bar as claimed in  claim 1 , wherein said self-tapping segment includes a main body and a helical thread that extends helically around said main body. 
     
     
         7 . The reinforcement bar as claimed in  claim 6 , wherein said helical thread of said self-tapping segment extends from an end of said main body distal from said rod segment toward said rod segment. 
     
     
         8 . The reinforcement bar as claimed in  claim 6 , wherein said helical thread has a sharp cutting edge. 
     
     
         9 . The reinforcement bar as claimed in  claim 8 , wherein said cutting edge of said helical thread has a first cutting surface and a second cutting surface that forms an angle with said first cutting surface, said angle ranging between 30 degrees and 60 degrees.