The application of cast iron manholes is crucial in terms of safety, and there are many details to be mindful of during the process. The use of cast iron manholes has evolved over time through continuous improvements, and a great emphasis is placed on their safety. Below, our Hebei Tiancai Building Materials Technology Co., Ltd. will provide a detailed introduction.
Ductile iron manhole covers are a type of cast iron manhole cover product. Through spheroidizing treatment, cast iron manhole covers obtain spheroidal graphite, effectively enhancing the mechanical properties of cast iron, particularly improving plasticity and toughness, thus achieving a strength higher than that of carbon steel. Cast iron manhole covers utilize widely used cast iron materials. The term "using iron instead of steel" primarily refers to cast manhole covers. Cast iron manhole covers are generally divided into circular and square shapes. In urban road management, circular covers are typically used as they are less likely to tilt, providing better protection for pedestrians and vehicles.
The inner diameter (or length x width) of the cast iron manhole cover must definitely be larger than the reserved manhole opening size; otherwise, it will significantly affect the load-bearing capacity.
Ensure that the wellhead and the concrete ground surface are firmly sealed during installation, with no gaps or hollows, otherwise they may be damaged by rollers during construction and installation, and this could affect their service life.
Third, when installing cast iron manhole covers on asphalt pavements, it is crucial to prevent construction machinery from directly crushing the manhole base. During road construction, an opening slightly larger than the manhole base should be reserved in the pavement. The cast iron manhole covers are used to cover pathways or deep wells, preventing people or objects from falling. Therefore, the installation of cast iron manhole covers must be carried out according to specifications for safety.
Cast iron manhole covers are highly beneficial for urban development in our daily lives, especially as they are commonly seen on busy streets. The production and use of these products not only facilitate our travel but also, different styles of cast iron manhole covers play a crucial role in our everyday life. However, there is a significant issue in the application of cast iron manhole covers, which is the sinking problem. Our Hebei Tincolor Technology & Construction Co., Ltd. will provide a detailed introduction to this issue.
The reason for the sinking of cast iron manhole covers in use is mainly due to the constant heavy pressure they endure, causing the manhole cover and rim to sink together. This sinking leads to a cascade of further issues, ultimately resulting in the loss of functionality and damage to the cast iron manhole covers, posing safety hazards to road traffic.
The reason for sinking of manhole covers during use is also due to the manufacturer's low design specifications for the cast iron manhole body and surrounding structure, as well as the lack of specialized reinforcement design for the backfill and surface layers around the manhole.
If there is a large number of heavy overloaded vehicles in urban traffic, they can cause damage to the underground drainage wells and their surroundings. Secondly, it may also be due to the inadequate rational planning and layout of pipeline projects within the motor vehicle traffic areas. Alternatively, the construction of the wells and their surroundings, under the influence of their own weight and the load from vehicles, are bound to settle unevenly.
