Process for installation of anchor devices and apparatus for carrying out such process

Process of installation of an expansion anchor device, which is used to secure a part to the surface of a structural support member (M), said device comprising an expandable sleeve (1), mainly extending along a longitudinal axis (X-X) with a proximal end (2) and a distal end (3), to be placed within a hole (F) formed in the structural member (M) that is designed to have the anchor applied thereto, said sleeve (1) having an axial cavity (4) defined by front coupling of at least one pair of concave half-sleeves (5, 6), said half-sleeves (5, 6) having therein respective flat sliding surfaces (7, 8), said flat sliding surfaces (7, 8) of the half-sleeves converging toward the axis (X-X) of the cavity (4) and in the direction of the proximal end (2) thereof, an expansion body (9) placed within the axial cavity (4) of the sleeve, said expansion body (9) having an internally threaded hole (10) and a contour (11, 12) that allows it to be axially displaced along said flat sliding surfaces (7, 8) of the cavity (4) of the sleeve but not to be rotated about the axis (X-X), which is characterized in that, once the hole has been formed in the support member and once said anchor device has been placed in the hole, a step of orienting the sleeve (1) is carried out such that the expansion thereof, when caused by the displacement of the expansion body (9) in the cavity (4) of the sleeve, occurs along the highest-resistance direction of the structural support member (M).