We all know that the installation of the manhole covers when the installation
height must be consistent with the road, the construction staff of the poor
operation and the late ground changes for the buried under the hidden dangers,
the reasons for what it is.
① seat cover under the seat plate material broken (usually cement mortar, there are some concrete). This phenomenon is common.
② wellbore masonry damage, masonry mortar loose.
③ in the way the motor vehicle road planning to lay the pipeline project unreasonable.
④ composite well covers and well structure design scale is low, well backfill and well Zhou pavement of the structural layer without special reinforcement design.
⑤ view wells and well weeks of structural stiffness difference between the large, by their own weight and vehicle load, must be different settlement.
⑥ In the installation of composite covers, the need to pay attention to a large number of heavy traffic in urban vehicles overload vehicles, and see wells and wells caused damage.
When the composite covers and the seat difference of 2 cm, the side of the road will be subsided, should be promptly handled.