Ductile iron manhole cover is generally divided into round and square, in the urban road, generally round, because the round well cover is not easy to tilt, can better protect the safety of pedestrians and vehicles。
Use the circular, mainly taking into account the circular covers through its center of each diameter length is the same, so if the covers were passing vehicles rolled up, because no matter how rolling, the diameter will be slightly wider than the wellhead, will not fall to the wellhead to manhole cover。
Ductile iron manhole cover is a kind of nodular cast iron, nodular cast iron by spheroidization and inoculation by spherical graphite, effectively improve the mechanical properties of cast iron, especially the plasticity and toughness increased, resulting in higher than the strength of carbon steel.
The physical and chemical characteristics of new type ductile iron manhole cover using QT500-7 nodular cast iron, light weight, high strength, good toughness, corrosion resistance, fatigue resistance, proper cost, compared with the same size of gray cast iron manhole cover, light weight 40%~50%, intensity ratio of gray cast iron covers the old phase ratio of 40%~50%。 The old cast iron manhole covers are brittle and easy to break。
The cover is used depends on the size of the wellhead, if to a non square manhole cover installed in the above area is far greater than the wellhead, then the material utilization and practical value of nature is not directly using the circular covers more effective, saving material covers also ensures the safety of the wellhead。
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