| 摘要 |
There is disclosed an anchoring system in concrete having a predrilled hole with an undercut. The anchoring system includes a cylindrical rod that is threaded at one end and has a truncated conical head at the other end. A sleeve extends over the lower portion of the cylindrical rod above the truncated conical head. The cylindrical rod is inserted into the hole so that the sleeve is adjacent to the undercut. The sleeve is fixed against being subsequently withdrawn. The cylindrical rod is then rotated relative to the sleeve thereby lifting up the truncated conical head into the sleeve so as to press against and thereby expand the sleeve outward against the walls of the undercut. |
