Tubular insert for a sandwich panel, method for placing such a tubular insert in a through-orifice of a sandwich panel and sandwich panel having at least one such tubular insert

A sandwich panel comprising:

• first and second outer walls,
• at least one cellular structure interposed between the first and second outer walls, and
• a tubular insert positioned in a through-orifice of the sandwich panel, the tubular insert comprising:
• a tubular body that has an axis of revolution, inner and outer cylindrical faces that are coaxial with each other and with the axis of revolution, and first and second annular terminal faces connecting the inner and outer cylindrical faces,
• at least one tab that has a first end connected to the tubular body and a second end at a distance from the first end, the first and second ends being substantially parallel to the axis of revolution of the tubular body, the at least one tab configured to move between a deployed position in which the second end is moved away from the tubular body and a retracted position in which the second end is positioned at the tubular body,
• wherein the tubular body comprises, for each tab, a cutout delimiting the tab and an opening when the corresponding tab is in the deployed position,
• wherein the at least one cellular structure has a thickness, and
• wherein each tab comprises upper and lower edges that are substantially parallel to each other, connecting the first and second ends, the upper and lower edges being spaced apart by a distance substantially equal to the thickness of the at least one cellular structure.