Brand:dingli
Model:DL
MOQ:3 Sets
Manhole closings are protected by a manhole cover (also known as a "biscuit"[citation needed]), a flat plug designed to prevent accidental or unauthorized
access to the manhole. Those plugs are traditionally made of metal, but may
be constructed from precast concrete, glass reinforced plastic or other composite
material (especially in Europe, or where cover theft is of concern).
Manholes are usually outfitted with metal, polypropylene, or fiberglass steps installed
in the inner side of the wall to allow easy descent into the utility space. Because of
legislation restricting acceptable manual handling weights, Europe has seen a move
toward lighter weight composite manhole cover materials, which also have the benefits
of greater slip resistance and electrical insulating properties.
The access openings are usually circular in shape to prevent accidental fall of the cover into the hole.
Manholes are generally found in urban areas, in streets and occasionally under sidewalks. In rural and undeveloped areas, services such as telephone and electricity are usually carried on utility poles or even pylons rather than underground.


