Profiled shape embedded in a concrete mass (20), to erect rails and dividing panels (25, 26).;It comprises a longitudinal shape formed by a bottom (1) and side walls (2, 3) defining a longitudinal cavity (4) with an inlet mouth at its upper edge, inside which cavity (4) seats and retains said panel (26).;Near the upper edge (18) of the longitudinal cavity (4) it is formed a tearable laminar sheet (16) monolithically attached to the internal surfaces (2a, 3a) of the sides extended between said opposite surfaces, the union of said tearable laminar sheet (16) being determined by longitudinal tearing lines (17) defining a reduction of the cross section of said laminar sheet.;The profile has alignment means (7, 8) according to a same longitudinal line and means of retention of its vertical stability (11, 12).;Each external lateral surface of each side of said shape has at least one lateral projection (9) defining the retaining means of the profile within the set concrete mass (20) and at the same time providing the vertical stability means.
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