Device for blocking a passage

A removable obturation device for transversely obstructing a passage delimited by a cylindrical side wall having a longitudinal axis, comprising:

• a) a support and blocking element comprising a central block having a longitudinal axis configured to be positioned in the longitudinal axis of said side wall of said passage, the central block supporting a plurality of different arms disposed perpendicularly in a radial position with respect to said longitudinal axis of said central block, the different arms being disposed symmetrically with respect to said longitudinal axis of said central block;
• each arm comprising an extensible rod comprising a pad at a free end thereof, the pad fastened in a reversible manner to the free end of said extensible rod, configured to be blocked in abutment against one said side wall by extension of said extensible rod, and
• b) at least one complementary hoop-shaped obturation element extending in a transverse plane perpendicular to said longitudinal axis of said passage, at least partly in or opposite a space between said arms so as to prevent an individual from falling through said passage, said obturation element being removably fastened to said support and blocking element;
• c) a removable actuation element configured to cooperate with said central block to actuate in extension or retraction said extensible rods of said arms simultaneously, said actuation element comprising first reversible fastening means on said support and blocking element, at said central block, said first reversible fastening means configured to reversibly fasten said actuation element on said obturation element.