(57) A mobile weir (1) for temporary closing of channels and port entrances essentially
formed by a base (2) extending on the seafloor of the port entrance, and by a series
of mobile floodgates (3) of a substantially rectangular shape, which are hinged edgewise
on the base (2) adjacent to one another so as to be able to swing around a substantially
horizontal axis of rotation (A); each mobile floodgate (3) being connected to the
base (2) by means of a pair of disconnectable hinges (4) which are made up of a fixed
portion (4a) stably anchored to the base (2), and of a mobile portion (4b) which is,
instead, fixed on the mobile floodgate (3) through a mechanical flanged coupling,
incorporates the joint for articulation of the hinge about the axis of rotation (A)
and is finally structured so as to be coupleable to the fixed portion (4a) of said
disconnectable hinge (4) in a stable, but readily releasable, way; the mobile portion
(4b) of the disconnectable hinge (4) being provided with an engagement head (8) and
a fork (10) made in one piece by means of a die-casting process.
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