With the development of urbanization, more and more manholes appear around us. It can be seen everywhere on roads, sidewalks and downstairs in apartments. It carries underground facilities for drainage and urban power services. While it brings me unlimited benefits, it also brings us many potential safety risks.
The first problem that people must consider is how much weight can manhole covers bear? The mission of a manhole cover is to make the road safe. If it cannot bear a reasonable weight, then for pedestrians or vehicles, it is like walking in the dark night without light. It will be dangerous.
Common manhole covers include cast iron manhole covers, ductile iron manhole covers and composite manhole covers. Next, we compare the advantages and disadvantages of several manhole covers from multiple angles.
Traditionally, manhole covers are made of cast iron. The biggest advantage of cast iron manhole covers is that they are cheap. The weight of cast iron manhole covers is relatively heavy, which increases the cost and difficulty of handling.
Cast iron manhole covers are brittle and will rust after a long period of time. Therefore, cast iron manhole covers are prone to damage after a long time and the maintenance cost is relatively high.
Nodular cast iron is an upgrade from cast iron manhole covers, popular in the 1950s, and is a high-strength cast iron material. It is often considered to be a better choice than cast iron manhole covers. The quality of ductile iron is lighter than cast iron. Nodular graphite is obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially plasticity and toughness. So as to obtain higher strength than carbon steel.
Composite manhole covers have become popular in the past ten years. The fiber-reinforced thermosetting composite material using unsaturated polyester resin as the matrix is a new type of environmental protection manhole cover.
The composite manhole cover is dense, wear-resistant, corrosion-resistant, and will not rust, so no maintenance is required. The inside of the composite manhole cover is reinforced by mesh steel bars, and the pressure will be dispersed to ensure safety when receiving a severe impact from an external force.
Since the composite manhole cover does not contain metal materials, there is no risk of rust and theft, which not only solves the road maintenance cost to a large extent, but also ensures the safety of pedestrians and vehicles. In addition, composite manhole covers are lighter than metal cast manhole covers, which is much more convenient for handling and unloading and also saves costs.
Prevent people from falling in and ensure road safety.
Prevent garbage and debris from entering the pit or drain.
Prevent the odor from spreading to the surrounding area.
It is convenient to repair underground facilities.
Being stolen causes losses, increases labor costs and poses the risk of falling to pedestrians.
The quality of the manhole cover is generally very heavy, and it is very difficult to carry the heavy manhole cover in the process of maintenance, installation and disassembly.
The risk of electric shock, metal cast manhole covers have had too many cases of electric shock.
Therefore, in terms of the function and existing problems of the manhole cover, the composite manhole cover perfectly solves all the above problems, and the composite manhole cover is also your best choice.
In addition to the above advantages, the composite manhole cover also has other unexpected advantages. Its perfect air tightness and anti-slip properties. The manhole covers of various colors enrich the boring city roads and become a beautiful scenery.
If you want to know more about the composite manhole cover, welcomes to contact us！
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