1, manhole cover body and borehole structure design of low scale, borehole backfill and borehole surface of each structural layer without special reinforcement design etc..
2, in the way of motor vehicle route planning pipeline engineering unreasonable.
3, a large number of heavy-duty vehicles in urban traffic, the formation of wells and wells to see damage.
4, check well and well path structure, by their own weight and vehicle load, will be different settlement.
Clever cover and the well ring together to prevent subsidence, the car was crushed when the downward force uniform conduction to all on the road.
New adjustable antisettling ductile iron manhole cover manhole brick facade by cutting force, the manhole cover frame and the surface to form a whole, and the road to maintain at the same level, as a result of changes in the manhole cover frame synchronous sinking because of manhole settlement.
At the same time, the self adjustable manhole cover frame and anti - settlement construction convenience convenience, small working face, little influence on transportation, construction and other advantages will be opened. Spring special self-locking can prevent the manhole cover beating, shockproof rubber ring can prevent the manhole cover to prevent oscillation and noise. Suitable places: highways, urban roads, national roads and other sections.
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