Anchor device for prestressed diaphragm wall

An anchor device for a prestressed diaphragm wall, comprising at least one prestressing reinforcement and a sleeve encasing said at least one prestressing reinforcement and forming an anchorage for said at least one prestressing reinforcement in the diaphragm wall, a length (Ld) of the anchor sleeve being strictly less than a length (La) of said at least one prestressing reinforcement, the anchor sleeve comprising a sealing material disposed in such a way as to coat each prestressing reinforcement, the anchor device comprising a corrosion-resistant coating of each prestressing reinforcement over all the length of each prestressing reinforcement, the anchor device further comprising a first sealed plug in an overlap zone between a part of said at least one prestressing reinforcement in the anchor sleeve and a part of said at least one prestressing reinforcement above the anchor sleeve, wherein each prestressing reinforcement comprises an individual protecting duct provided around the part of each prestressing reinforcement above the anchor sleeve, and wherein the anchor device further comprises a second sealed plug positioned beneath a first base forming a bottom of the sleeve, wherein the corrosion-resistant coating comprises the individual protecting duct, said individual protecting duct protecting individually each prestressing reinforcement only in the part of each prestressing reinforcement disposed above the sleeve.