In general, the airport, dock etc. belong to the heavy-duty expressway, according to the national standard covers who must reach above 36T can meet the requirements from the data analysis only the ductile iron manhole cover can reach the standard of who covers the bearing capacity for other materials:
The bearing capacity of the manhole cover is a key indicator of the manhole cover can be used on the road, if the carrying capacity is not high, the use of crushed and nodular cast iron covers were stolen and no difference.
Therefore, no matter what the use of material covers, for use on the road, the test load reaching at least to the provisions of the "36t" standard cast iron manhole cover.
With the development of the city, road widening, traffic is more and more big, the load increasing, the bearing capacity of the manhole cover are increasingly high requirements.
Therefore, the new material covers not only to achieve the existing "standard" iron covers more than this standard, but also should. If you want to develop new standards and regulations that covers, division of bearing capacity should refer to the European standard EN124, the use of motorized vehicles on the bearing capacity of the manhole cover is not less than 40T.
So, we are at the airport, wharf, highway and other occasions, all must be through the heavy ductile iron manhole covers, because other basic materials are not up to the requirements.
It is through the ball and inoculation treatment to get spherical graphite, which will improve the mechanical function of cast iron and a lot of progress, it is a ductile iron products in a kind of very cheap. Now it is generally divided into circular and square, has a strong ability to bear, but also a strong tolerance.
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