Ductile iron anti- settlement adjustable manhole cover by using frame special structure, the manhole frame and manhole from the original "pier" connection to "plug" connection, large frame on the asphalt pavement, no external hinge, through the well side and above pressure, the well load greatly reduced, effectively solve the road settlement and damage problem, and by using three-point spring arm lock device fixed cover, frame, to prevent the cover beating, reduce the noise. A new adjustable anti-settlement manhole cover is adopted. The new adjustable anti-settlement manhole cover includes manhole cover body and manhole cover frame, which solves the problem of easy damage, and achieves the effect of reducing noise, eliminating settlement, saving construction period, with obvious economic benefits.

The new adjustable anti-settlement manhole cover has rapid construction, reduced construction impact, strong integrity, high degree, less surface, quick and convenient construction, can open to traffic without maintenance; prevent settlement, noise, odor, prevent manhole cover beating, vibration, displacement, prevent accidental opening, prevent accidental closure and skid effect and easy to clean.