1 thought on “The useful life of cast iron tunnels”

  1. The service life is more than 30 years, and the rainwater dumplings are a groove cover made of cast iron or steel grid. The road can be seen everywhere. The cost is not high and the effect is quite large.
    It the design and installation of the manhole cover is unreasonable. The cast iron manhole cover is mainly used by municipal engineering. Effectively improve the mechanical properties of cast iron, especially to improve plasticity and toughness, thereby obtaining higher strength than carbon steel. The load -bearing standards of different balls and cast iron manhole covers are different. This requires everyone to be cautious when buying the manhole cover and see where to use. The so -called heavy type now pointed out that 360kn or super -level 20 main car allows in the factory inspection.

    . The material of the manhole cover itself does not have any problems. In practice, it is found that there is basically no manhole cover rupture, but the key is that the width of the manhole is generally only 40 ~ 60mm width, and the vehicle load cannot be effectively spread. The cast iron manhole cover is connected by mechanical interface accessories, and the steel -made dual suit is used for connection.

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