Manhole covers are closures at the top of entrances and exits to underground facilities, used for standing water, sewage, telecommunications cables, valves, storms.
According to the technical characteristics of pipeline engineering, in order to meet the requirements of installation equipment, daily maintenance and maintenance, inspection Wells are set up along the buried direction of pipeline according to a certain spacing. The manhole cover is the main supporting product of the inspection well. Its function is to bear the load, close and open the inspection well.
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