Apparatus for specifying the position of a lid of a manhole, installation method of the apparatus for specifying a position of lid of the manhole, and method of using the apparatus for specifying position of a lid of the manhole

摘要

A locatable slab assembly (2) for overlying a manhole cover (41) located beneath a lowermost surface of a pavement (44) is disclosed. The locatable slab assembly (2) includes a slab body (20), a tubular member (22), a protective plug (24), and an electronic marker (25). The slab body (20) is deposed to permit a central line (C2) of the slab body (20) in line with a center line (C1) of the manhole cover (41). The electronic marker (25) is configured to permit a region (45) of the pavement (44) in alignment with the center line (C1) of the manhole cover (41) to be located. The locatable slab assembly (2) together with the pavement (44) thereon can be lifted to permit access of the manhole cover (41).