| 摘要 |
<p>This publication discloses a method and apparatus for forming frogs (7) in the sides of a slipformed concrete element (5), especially a hollow-core slab. In accordance with the invention, the frogs (7) are formed in the sides of the element (5) by removing cast material from the sides by a reciprocative scraping action. The reciprocative movement parallel to the side of the element (5) is effected with a drive motor (8) and a lever assembly (l7). By means of the method, it is possible to obtain a desired frog shape and depth without damaging the side surfaces. </p> |
