SND Ductile Iron Manhole Covers + Tree Grates: Comprehensive Upgrade Project for Municipal Roads

Project Background

A 15km main road and greening upgrading project in the core area of a provincial capital city faced issues such as noise, settlement and theft of traditional manhole covers, as well as water accumulation in tree pits and uneven pavement. The project required balancing traffic load-bearing, pedestrian safety and urban landscape unity, with a service life of over 30 years to adapt to the high-frequency traffic of 100,000 vehicles per day.

SND Product Solution

·Core Products: EN 124 Class D400 ductile iron manhole covers (Φ700/800mm), ductile iron tree grates (600×600mm/800×800mm customized models)

·Technical Highlights: Manhole covers adopt 3-point spring arm locking + wide-edge socket structure to solve noise and settlement problems; epoxy spray anti-corrosion treatment on the surface adapts to the urban humid environment; tree grates feature hollow pattern design with a friction coefficient ≥0.6, achieving both anti-slip and water-permeable functions, and rounded edge treatment to avoid pedestrian collision.

·Customization Service: City LOGO is cast on tree grates for integrated design with road landscape; manhole covers adopt differentiated color identification according to pipeline types (gas/water supply/communication).

Application Results

·After installing more than 1,200 manhole covers and 800 tree grates, 18-month actual measurement shows no settlement or noise of manhole covers, zero theft rate, and maintenance frequency reduced from 2 times per year for traditional products to 1 time every 5 years.

·Tree grates effectively solve the problem of water accumulation in tree pits, increase tree survival rate by 30%, and avoid pedestrians trampling on lawns, improving the overall aesthetics of the road.

·The comprehensive operation and maintenance cost is 60% lower than that of traditional products, and it has been included in the preferred list of municipal procurement by the local housing and urban-rural development department.