| 摘要 |
FIELD: machine building.SUBSTANCE: invention relates to the expanding concrete nail, and is directed to improve protection against turning during the thread element screwing in. The expanding concrete nail with the concrete nail body lasting in axial direction, having hole passing in axial direction to receive the expanding element, with splines going mainly in axial direction to form the elastic zones acting in radial direction, wherein in the concrete nail wall in zone of at least one spline in unloaded state of the expanding concrete nail there is a lock spine protruding in radial direction outside, and the concrete nail wall on the internal side radially off the area of the spine is connected at one level with the adjacent to it in axial direction area of internal wall of the expanding concrete nail.EFFECT: joint improvement.10 cl, 4 dwg |
