Advantages • High strength: Such as magnesia inspection manhole covers, ductile iron manhole covers, etc., have high compression, bending and impact resistance, and are tough. The manhole covers will not be crushed or damaged after long-term use, and can completely prevent the occurrence of "urban black hole" accidents • Good safety: When subjected to force, the circular manhole cover can evenly distribute the weight it bears to the entire circumference, which can minimize the risk of deformation and rupture of the manhole cover due to excessive pressure; and its own weight is evenly distributed, the overall structure is more stable, and it is not easy to tilt or deform. In addition, round manhole covers have no sharp corners, and their rounded corners can avoid cutting or scratching pedestrians or vehicles. • Beautiful appearance: Some manhole covers have exquisite surface patterns and bright and adjustable colors, such as some composite manhole covers and resin manhole covers, which can beautify the urban environment and can be customized according to different usage scenarios and needs to make them coordinated with the surrounding environment. • Easy to use and light weight: Products such as magnesia inspection manhole covers weigh only about one-third of cast iron, which is convenient for transportation, installation, and repair, greatly reducing labor intensity. • Strong anti-theft performance: Magnesium inspection manhole covers and other products have no recycling value and are naturally anti-theft; and locking structures can be set according to customer needs to prevent theft of property in the well. • Strong weather resistance: Through scientific formulas, advanced processes, and complete technical equipment, some manhole covers can be used normally in an environment of -50℃~+300℃, and are resistant to acid and alkali, corrosion, wear, and vehicle crushing, with a long service life. Application • Municipal roads: In the city’s motor vehicle lanes, non-motor vehicle lanes, sidewalks, green belts and other areas, manhole covers of corresponding grades are selected according to different load-bearing requirements. For example, heavy-duty manhole covers can be used in urban main roads, highways, high-grade highways, expressways and other areas; ordinary manhole covers are suitable for roads or parking lots for vehicles of Class 10 and below; light manhole covers are used in green spaces, corridors, bicycle lanes or sidewalks where motor vehicles are prohibited from entering. • Residential communities: sewage wells, rainwater wells, communication wells, etc. in the community generally use ordinary or light manhole covers to meet the traffic needs of vehicles and pedestrians in the community, while ensuring the safety of residents.

• Industrial parks: When installing manhole covers above various industrial pipeline wells, cable wells, etc. in the factory area, it is necessary to select appropriate materials and models according to different industrial environments and load-bearing requirements, such as acid and alkali resistant, corrosion-resistant resin manhole covers or high-strength cast iron manhole covers, etc., to ensure the normal progress of production activities and personnel safety. • Docks and airports: Docks, airports and other areas often have large vehicles and equipment passing through, so the manhole covers have high requirements for their load-bearing capacity. Heavy-duty or even higher-grade manhole covers are usually selected. For example, freight stations, docks, airports and other areas can use manhole covers of type e600 and above. • Other special places: Some places with special requirements, such as areas with flammable and explosive gases, will use explosion-proof manhole covers. Gas sensor technology is used to accurately monitor the gas concentration in the pipeline. Once the critical value is exceeded, it will automatically alarm to ensure the safety of the surrounding environment; other places will use smart manhole covers, such as flood-proof manhole covers that use split ultrasonic level meters to monitor the water level of the manhole in real time, and anti-theft manhole covers with abnormal movement alarm functions. These manhole covers can be connected to the smart city management platform to achieve real-time monitoring and management of the manhole cover status.