| 摘要 |
An apparatus for forming frogs in the sides of a slipformed concrete element, especially a hollow-core slab is disclosed. In accordance with the invention, the frogs are formed in the sides of the element by removing cast material from the sides by a reciprocative scraping action. The reciprocative movement parallel to the side of the element is effected with a drive motor and a lever assembly. By the method, it is possible to obtain a desired frog shape and depth without damaging the side surfaces.
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