When it comes to the world of infrastructure, there are numerous considerations that need to be taken into account. From roads and highways to sewer systems and drainage, each component plays a vital role in maintaining the functionality and safety of our cities and towns. One such component that often gets overlooked but is of utmost importance is the manhole cover.

To prevent the nodular cast iron manhole cover from being eroded underground and extend the service life of the pipe network, the outer surface of the nodular cast iron manhole cover should be coated with a layer of asphalt paint, and then packed into the warehouse.

Inspection well covers are an organic part of urban roads. In the process of urbanization, road construction is an important standard to test its results. Both for foreign visitors and local residents. “The missing manhole cover" is a shadow, which will not only bring inconvenience to travel, but also cause falling accidents, which will seriously bring property damage and personal casualties.

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A manhole (utility hole, maintenance hole,[1] or sewer hole) is an opening to a confined space such as a shaft, utility vault, or large vessel. Manholes are often used as an access point for an underground public utility, allowing inspection, maintenance, and system upgrades. The majority of underground services have manholes, including water, sewers, telephone, electricity, storm drains, district heating, and gas.

For most of us, manholes exist at the edge of our consciousness. You may only find yourself thinking about them when your car hits one in the road and you experience a bump or when people take refuge underground in an apocalyptic movie.But there’s really nothing more practical than a manhole. Let’s take a look at the different types of manholes and the purposes they serve.

A manhole cover or maintenance hole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.