(57) A device is disclosed for maintaining manholes or trapdoors closure coplanar with
the road surface, the manholes or trapdoors including one or more inner vertical walls
(2,211), which form the body of the manhole or trapdoor (1), a cover (3), and a seat
(41,51,411) having angular section, for receiving and supporting the cover (3). The
device comprises an adapter element that inserts into, and matches with, the seat
(41,51,411) for elevation and containment of said cover. The cover is firstly mounted
temporarily at a zero elevation position, for laying a first layer of a binder. Then,
the cover is mounted at a definitive elevation position, by inserting or changing
the adapter element, when the first asphalt layer is applied. The adapter element
is added or changed also when the asphalt layer is re-applied for road reparation.
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