In expressways, airport runways, port terminals, and other ultra-heavy traffic zones, road damage and safety hazards caused by manhole settlement demand radical solutions. Road Middle Treasure’s 700×900×150 ductile iron anti-settlement cover redefines industry standards with military-grade structural design. Cast integrally from QT500-7 ductile iron per GB/T23858 and CJ/T327-2010 standards, its 150mm ultra-deep ring integrated with a flange base directly transfers wheel loads to road structural layers—blocking soil stress transmission paths. The 700×900mm outer-square/inner-round structure fits large circular openings, providing multi-fold load-bearing contact area engineered to withstand thousand-ton impacts from airport cargo vehicles and port container trucks. It stands as the "zero-settlement guardian" for national mega-projects.
The ring’s sidewalls feature innovative 3D reinforcement ribs, increasing bending rigidity by 300%. A triple elastic sealing system combined with hot-dip galvanizing + polyurethane coating ensures 30+ years maintenance-free service. Road Middle Treasure’s precision casting achieves ≤0.5mm ring-cover clearance, while diamond deep-groove anti-slip patterns (friction coefficient: 0.68) deliver ultimate safety in wet port areas and airport de-icing environments—setting new benchmarks for heavy-load infrastructure.
