Nowadays, ductile iron manhole covers are more popular. It has many advantages that other well covers do not have, so it is recognized by people. Specifically, it has reasonable price and long service life.
However, the chemical composition of the product is many, but it is very stable, containing carbon, silicon, manganese, phosphorus, etc., which is not easy to rust. In addition, the workmanship of nodular cast iron manhole cover is also very good. Rubber is installed at the junction of the well cover and the ground, so that the noise of the car passing through the well cover is very small, and the well cover will not pop up, ensuring the safety of the residents. The well cover design can only be opened by professionals, so as to ensure the service life of the well cover, reduce losses and act as an anti-theft function.
In addition to the improvement of double shaft safety, in order to prevent rainwater from drilling and opening the well cover, three anti loosening fastening snap rings are specially installed. If the operation steps and methods are incorrect, it is almost impossible to lift the well cover with brute force to open the well cover. Even in the case of heavy rainfall, it is almost impossible for a sudden rainstorm to overturn the well cover.
Nodular cast iron manhole cover is mainly made of nodular cast iron. The quality of this kind of nodular cast iron manhole cover involves the problem of spheroidization rate. The common coating used to treat castings is antirust asphalt paint. Of course, the surface of well cover is also treated with antirust asphalt paint. One advantage of the product is that due to the high strength and good toughness of nodular cast iron, the nodular cast well cover is about 30% lighter than the same type of gray cast iron well cover.
Now, with the construction of the city, the application of nodular cast iron manhole covers is more and more, and it also occupies a very important position in the market. Many underground tunnels of power facilities in China are installed and protected with it, so its quality is related to our application effect. At present, the products used in our market are generally circular nodular well covers or square nodular well covers. In our road installation, the circular well covers are not easy to tilt.
Nodular cast iron manhole covers effectively ensure the normal passage of passing personnel and vehicles. It has a good tolerance. Even if some large vehicles are crushed, it will not cause tomato or tilt damage. It has good environmental protection effect, can better protect our underground power equipment and effectively prevent fire.
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