Anchor bolt has conical section at its base which spreads tubular sleeve with longitudinal slit and rows of locking studs with triangular or rectangular cross-section on outside

摘要

The anchor bolt has a conical section at its base which spreads a tubular sleeve as it is screwed in. This has a longitudinal slit (6) and rows of locking studs (15) with a triangular or rectangular cross-section on the outside