主要运用在路途和城市下水管道中，所以井盖的巨细程度和柔耐性决议了井盖与井口巨细的配合程度和运用功率是否符合杰出，我们看看柔耐性在其间占了一个什么样的位置。 Ductile iron manhole covers are mainly used in roads and urban sewers, so the size and flexibility of the manhole cover determines whether the degree of cooperation between the manhole cover and the size of the wellhead and the power used are in accordance with the outstanding. Let us see what kind of flexibility resistance accounts for. position.
Hardness and resistance are problems of raw materials, and other problems for the quality of nodular cast iron manhole covers are in planning. This is because the size and shape of cast iron manhole covers must be considered from the perspective of casting alloy and casting process characteristics. The rationality of the plan; mainly the obvious size effect and the problems of solidification, shortening, stress, etc., to prevent or reduce the occurrence of defects such as segregation, deformation, cracking of the cast iron manhole cover; in the end, it is necessary to be reasonable for the casting process.
The manhole cover must completely conform to the wellhead, and the situation that the head is large and the body is small or that the head is small is too big, otherwise a slight accident will be threatened by the wellhead and the cover.
Ductile iron manhole covers are usually used in road administration. In addition to sidewalks and other roads that are mainly used by pedestrians, there are some parking lots that are often pressed by large motor vehicles. The quality requirements are more stringent. Different roads face manhole covers. There are different requirements for the load rating. Before the installation, a comprehensive understanding of the manhole cover is required to determine whether it can be followed. Only to ensure that the quality of the product and the quality of the device are qualified can we have qualified manhole cover products.
Ductile iron manhole covers are used in areas where motor vehicles are prevented from entering, pipelines in residential quarters, water drainage projects in streets and alleys, in areas with only light motor vehicles or cars, and within 0.5m of the curb line on both sides of the road. Cargo terminals, terminals, airport runways within the airport area, etc. are all where they work and stand.