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How To Maintenance Manhole Cover?

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The manhole cover itself is very wear-resistant and corrosion-resistant, but there are still wear problems. How to solve these problems?
It must be ensured that its security is firm and its application is stable before it can have the desired effect. Therefore, people's staff must bear in mind that after a period of temporary use, it is necessary to immediately check all the staff, including whether some screws of it are loose, whether the surface layer is covered by a relatively serious fog, whether the surface layer has a relatively serious erosion and damage, and immediately clean up.
In the ordinary application, it is necessary to properly carry out the maintenance work, that is to say, to clean it, so as to ensure its quality.
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