Small manhole covers are responsible for people's travel safety. Therefore, these standards for Fuzhou ductile iron manhole covers are also formulated for everyone's safety.
Class mark setting occasion Light Q Green road, parking lot, bicycle lane or sidewalk forbidden to enter by motor vehicles P-10 level or below roads or parking places where heavy vehicles are passing Z Heavy-duty roads or parking covers where vehicles are used to cover Defenses on roads or in deep wells at home to prevent people or objects from falling.
Generally it is divided into circular and square. In urban road management, circular is generally used because the round manhole cover is not easy to tilt, which can better protect the safety of pedestrians and vehicles. The use of circular is mainly considered that the length of each diameter of the circular manhole cover through its center is the same, so if the manhole cover is rolled up by the passing vehicle, because the diameter will be slightly larger than the wellhead below, Wide, the manhole cover will not fall into the wellhead.
If a square is used, because the diagonal of the square is obviously longer than the length of each side, when such a manhole cover is rolled up, it is easy to fall into the well along the diagonal direction of the wellhead, causing hidden safety hazards. If the wellhead is made round or significantly smaller than the well cover, the square well cover will not fall into the well. This involves the issue of large-scale utilization and conservation of materials. The use of a wellhead depends on the size of the wellhead. If you have to install a square manhole cover that is much larger than the wellhead, the use and practical value of the material is naturally more effective than directly using a round manhole cover. Guaranteed the safety of the wellhead.