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Question lecture plan ferraillage

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Bonjour à tous,

J'ai reçu les plans de ferraillage de mon agrandissement la semaine dernière, mais il y a deux choses que je ne comprends pas:

Que veut dire : "AI dito existant" ???

Sur la définition des treillis soudé : "ST 20 RECt = 30" que veut dire RECt = 30 ?????

"ST10 L=100 axes sans RECt " et là aussi que veut dire le RECt?

Merci pour vos reponses


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