Double-support fastening device for a shuttered structure

A fastening device intended to ensure the fastening of an external functional element on a shuttered structure, such as a shuttered wall or a shuttered slab for example, the shuttered structure extending substantially parallel to an orientation axis and being obtained by pouring and hardening of a pouring fluid inside a formwork including at least one first formwork element and one second formwork element, such as a shuttering panel, the fastening device including:

• an internal part intended to be at least partially embedded in the shuttered structure, and which comprises:
• a) a first portion internally defining a receiving area emerging outwards at a first peripheral edge,
• b) a holding element, configured to be in contact with a first internal side of the first formwork element at the time of said pouring, the holding element being capable of occupying an insertion position in which all or part of the holding element is inserted inside a portion of the receiving area, the holding element being configured to be able to be removed from the receiving area,
• c) a second portion including a second peripheral edge configured to be in contact with a second internal side of the second formwork element and
• d) a fastening portion configured to be accessible from the outside of the shuttered structure after hardening of the pouring fluid and removal of the formwork, the fastening portion defining at least one first securing element,
• the fastening device further including an external part which comprises a second securing element configured to be secured to the fastening portion of the internal part the external part being intended to hold the external functional element in position relative to the internal part.