The cover for manholes can use cast iron well cover, cover made of
composite materials and cover of steel fiber reinforced concrete.
The quality is in accordance with the requirement of current
CJ/T******0 Plastic manholes for drainage in construction
zone. Its color is white or gray, with the interior and
exterior wall for well shaft being flat, smooth, and without
bubble, crack, sag, uneven color and decomposed color line on
surface. The plastic well seat and shaft shall be without any crack
or split under the static load pressure of *5KN.
