Patent Number: 
Section: claims

1. A containment airlock for working on a site on which radiological, asbestos, biological and/or chemical contamination occurs, comprising:a self-supporting frame, the frame being articulated so that it is expandable from a collapsed storage position and an extended work position,a flexible containment shell that is configured to be removably assembled to the frame, wherein the flexible containment shell comprises panels that are each configured to prevent contamination of an interior or an exterior of the containment airlock by radiological, asbestos, biological and/or chemical contamination throughout each panel, andhooks to removably attach the shell to the frame, wherein the hooks suspend the shell inside an internal space defined by the frame when the frame is in the extended work position,wherein the frame comprises a first collapsible plane frame, a second collapsible plane frame, and rigid single-piece reinforcing rods that connect the first collapsible plane frame to the second collapsible plane frame,wherein each of the first collapsible plane frame and the second collapsible plane frame contains vertices of the frame and articulated reinforcing rods that connect the vertices of the first collapsible plane frame to each other and the vertices of the second collapsible plane frame to each other,wherein each of the articulated reinforcing rods comprises a first rigid segment, a second rigid segment and at least one intermediate articulation connecting the first rigid segment to the second rigid segment,wherein the rigid single-piece reinforcing rods connect the vertices of the first collapsible plane frame to the vertices of the second collapsible plane frame, wherein the first collapsible plane frame and the second collapsible plane frame are located at opposite longitudinal ends of the rigid single-piece reinforcing rods,wherein the first collapsible plane frame and the second collapsible plane frame are configured such that the first rigid segment and the second rigid segment of the articulated reinforcing rods move towards the rigid single-piece reinforcing rods when the frame moves from the extended work position to the collapsed storage position,wherein the first collapsible plane frame and the second collapsible plane frame are configured such that the first rigid segment and the second rigid segment of the articulated reinforcing rods move away from the rigid single-piece reinforcing rods when the frame moves from the collapsed storage position to the extended work position,wherein each vertex of the first collapsible plane frame is connected to at least two articulated reinforcing rods so that each side of the first collapsible plane frame collapses when the frame moves from the extended work position to the collapsed storage position,wherein each vertex of the second collapsible plane frame is connected to at least two articulated reinforcing rods so that each side of the second collapsible plane frame collapses when the frame moves from the extended work position to the collapsed storage position,wherein each vertex of the first collapsible plane frame and each vertex of the second collapsible plane frame is configured to guide in rotation the segments of the articulated reinforcing rods relative to the vertex towards the inside of the frame when the frame moves from the extended work position to the collapsed storage position, andwherein each vertex of the first collapsible plane frame and each vertex of the second collapsible plane frame is configured to guide in rotation the segments of the articulated reinforcing rods relative to the vertex towards the outside of the frame when the frame moves from the collapsed storage position to the extended work position. 2. The containment airlock according to claim 1, wherein the intermediate articulation of each articulated reinforcing rod is configured to rotate and to guide the first rigid segment of the reinforcing rod relative to the second rigid segment of the reinforcing rod towards the inside of the frame when the frame moves from the extended work position to the collapsed storage position, andwherein the intermediate articulation of each articulated reinforcing rod is configured to rotate and to guide the first rigid segment of the reinforcing rod relative to the second rigid segment of the reinforcing rod towards the outside of the frame when the frame moves from the collapsed storage position to the extended work position. 3. The containment airlock according to claim 1, wherein the intermediate articulation of each articulated reinforcing rod is located approximately in the middle of the articulated reinforcing rod. 4. The containment airlock according to claim 1, wherein the intermediate articulation of at least one of the articulated reinforcing rods comprises a locking element configured to lock the position of the first rigid segment of the reinforcing rod relative to the position of the second rigid segment of the reinforcing rod. 5. The containment airlock according to claim 4, wherein the intermediate articulation comprises a clevis and wherein the locking element comprises a latch that is free to move relative to the clevis between a locked position and an unlocked position of the articulation. 6. The containment airlock according to claim 1, wherein the intermediate articulation of each articulated reinforcing rod is configured to rotate and to guide the first rigid segment of the reinforcing rod relative to the second rigid segment of the reinforcing rod about a pivot link, andwherein at least one of the vertices is configured to rotate and to guide the first rigid segment of the articulated reinforcing rod relative to the vertex about a pivot link. 7. The containment airlock according to claim 1, wherein at least one of the vertices comprises a housing to partially house the first rigid segment of the articulated reinforcing rod,wherein the housing is at least partially delimited by walls configured to make the first rigid segment pivot relative to the vertex when the frame moves from the extended work position to the collapsed storage position, andwherein the housing is at least partially delimited by walls configured to make the first rigid segment pivot relative to the vertex from the collapsed storage position to the extended work position. 8. The containment airlock according to claim 1, wherein at least one of the vertices comprises an internal end piece configured to engage by cooperation of shapes at least one segment of the articulated reinforcing rod connected to the vertex. 9. The containment airlock according to claim 1, wherein at least one of the vertices comprises at least one first side wall, a second side wall, a horizontal wall and an internal wall,wherein the first side wall, the second side wall and the horizontal wall are orthogonal in pairs and intersecting each other, wherein the internal wall extends perpendicular to the horizontal wall,wherein each of the side walls has an approximately triangular external surface, wherein the internal wall comprises a first segment that extends parallel to the first lateral wall and a second segment that extends parallel to the second lateral wall, each of the first segment and the second segment having an approximately triangular external surface,wherein the internal wall and the first side wall delimit a first internal housing for the first segment or the second segment of the articulated reinforcing rod, wherein the internal wall and the second side wall delimit a second internal housing for the first segment or the second segment of another articulated reinforcing rod, wherein the internal wall and the side walls delimit a central conduit for one of the rigid single-piece reinforcing rods. 10. The containment airlock according to claim 1, wherein the first collapsible plane frame is a horizontal plane support frame, wherein the second collapsible plane frame is a horizontal plane top frame, wherein the rigid single-piece reinforcing rods is the uprights of the frame. 11. The containment airlock according to claim 10, wherein the containment airlock has a generally parallelepiped shape when the frame is in the extended work position. 12. The containment airlock according to claim 11, wherein the containment airlock has a generally parallelepiped shape when the frame is in the collapsed storage position. 13. The containment airlock according to claim 1, wherein the shell is made of a dust tight material. 14. The containment airlock according to claim 1, wherein the shell is made of a single-piece by welded plastic panels. 15. The containment airlock according to claim 1, wherein the shell is made of a plastic material comprising cross-linked polyurethane and/or a vinyl polymer, such as polyvinyl chloride. 16. The containment airlock according to claim 1, comprising depressurisation means configured to create a vacuum inside the airlock, relative to the air pressure outside the airlock. 17. A containment assembly comprising a plurality of containment airlocks according to claim 1 that are adjacent to each other and connected together, to form a containment zone, particular to protect against radiological, asbestos, biological and/or chemical contamination.