Manhole cover is a covering used to cover deep wells on roads or in homes to prevent people or objects from falling. It includes cement concrete manhole covers and is suitable for various environments such as green belts, sidewalks, motor vehicle lanes, docks, alleys, etc. Manhole covers have a huge market demand in urban planning and road construction, but at the same time, they also face the situation of being crushed and damaged, which may lead to a decrease in the safety of roads and facilities.
Manhole covers have diverse materials and types. For example, cast iron manhole covers are divided into ductile iron manhole covers and gray cast iron manhole covers. The compressive capacity of ductile iron manhole covers is stronger than that of gray cast iron manhole covers. The new anti-settlement manhole cover is made of ductile iron. Through the self-shrinking well structure and the design of the bottom adjustment ring, it can effectively avoid rainwater corrosion and rust and reduce noise generation.
In addition, the standards and specifications of manhole covers are also important aspects to ensure their functionality and safety. There are multiple manhole cover standards in China, such as the GBT 23858-2009 inspection manhole cover standard and the CJT 511-2017 cast iron inspection manhole cover industry standard. These standards are designed to ensure the quality and safety of manhole covers.
In urban construction, manhole covers connect various underground facilities such as tap water pipelines, sewage pipelines, rainwater pipelines, cables, etc. Therefore, there are also various types of manhole covers, including water well covers, sewage well covers, rainwater well covers, power well covers, street lamp well covers, communication well covers, gas well covers, etc. Each type of manhole cover has its specific function and identification.