Manhole cover, over an inspection shaft for sewers and the like, has a base and an insert with screw bolts to set the vertical gap between them to compensate for shifts and distortions

摘要

The manhole cover, over a shaft into sewers or water supply pipes and the like, has a base (A) and an insert (B), with screw bolts to set the vertical gap between them. The insert has a conjugated opening (10) for the partial insertion of an edge (4) of the base. An outer cover (C) fits on the insert.