The structure has an opening frame constituted of an opening top profile and an opening bottom profile extending in a longitudinal direction of a greenhouse. Lateral profiles (3) are glued between angles (2b) of a central profile (2). The lateral profile presents a geometrical shape with respect to diagonals (Y1Y1', Y2Y2') passed by the angles of the central profile. The lateral profile and the central profile form identical grooves (4) on external faces of a multi-tubular closed longitudinal sliding profile (1a).
