Sill and opening-leaf assembly for a door that essentially is fluid-tight to a liquid or gaseous fluid and is intended to seal an opening separating two spaces in a building or monument

A sill and opening-leaf assembly for a door that is essentially fluid-tight to a liquid or gaseous fluid and intended to seal an opening separating two spaces of a building or monument, comprising:

• an opening leaf having a lower edge face which is situated, when mounted, facing a floor surface, and a sill able to provide fluid-tightness, with respect to a fluid, of a bottom part of the door concerned, between the lower edge face and the floor surface,
• wherein the sill comprises:
• at least one flat and elongate gasket element of a tongue type, which includes a front longitudinal surface and a rear longitudinal surface, and which is attached via one of its longitudinal sides or longitudinal attachment side to the lower edge face and
• at least one sealing and travel groove, including a bottom and two longitudinal edges, which is made in the floor surface across the opening concerned and in that the gasket element, when mounted, is able to engage with either of the longitudinal edges, by being allowed to travel into the groove, depending on whether a pressure force is exerted by a liquid or gaseous fluid from one of the two spaces on the front longitudinal surface or rear longitudinal surface of the gasket element, so as to ensure the fluid-tightness of the bottom part of the door concerned.