| 摘要 |
For attachment of metal plates to concrete, a nail (1) is used, at the point (5) of which at least two radial grooves (7, 9; 7', 9', 11') are arranged having a depth decreasing in the direction towards the head of the nail. In this way it is achieved that the nail when being driven into the concrete bends or arches inside the concrete and is anchored in such a secure way that the head (4) of said nail can be welded to the plate (15), there being no risk of having said nail being loosened from the concrete material (19) in this welding operation. |
