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Armature de frettage


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J'ai un problème , j'ai un plan de ferraillage d'un poteau et au niveau de chapeau il est mentionné "armature de frettage " en maille 200*200 diamètre 12.

Svp c urgent je veux savoir il voulai dire quoi par armature de frettage et c quoi le role de ces armatures .


voici schéma ci-joint


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