| 摘要 |
The coffer comprises, on its plastics bottom (2) which is in contact with the concrete, a succession of aligned drillings for the passage of the curved ends (9a) of connection frames (9). A metal wire (110) runs along the internal or external face of the bottom with its ends passing through the drillings. This enables a cutting out by the wire of the bottom along the drillings during extraction of the coffer.
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