Ductile iron manhole covers can be divided into heavy manhole covers and light manhole covers. The so-called heavy-duty refers to the allowable pressure-bearing 360kN or supercar-20 main vehicle during factory inspection; the light-duty refers to the allowable pressure-bearing 210kN or steam-10 main vehicle. The editor will introduce in detail below Classification and different uses of various ductile iron manhole covers.
Heavy airports or highways for helicopters to take off and land on various roads and venues
Heavy Urban roads, highways and parking lots where motor vehicles are used and parked
Ordinary type Slow lanes, residential complex passages and access roads
Lightweight Green belts and alleys, roads and venues where motor vehicles cannot be used or parked
Bearing capacity index:
aggravated ≥360 1/500xd
heavy duty ≥240 1/500xd
Ordinary type ≥100 1/500xd
light ≥20 1/500xd
Manhole covers are used to cover roads or deep wells at home. Ductile iron manhole covers prevent people or objects from falling. Casting can be divided into metal manhole covers, high-strength fiber cement concrete manhole covers, resin manhole covers, etc. according to materials. Generally round. Can be used for green belts, sidewalks, motor vehicles, docks, alleys, etc.
1. Quick demoulding, it can be separated at the time during the production process, and can be produced continuously without interruption, which is dozens of times higher than the production of other molds.
2. Long service life, made of medium steel plate, can be used continuously for tens of thousands of times.
3. The appearance of the product is tidy, the size is standard, the surface pattern, and the text can be replaced at any time according to the requirements.
4. Due to the good shock resistance of the steel mold, the compression resistance of the products produced is enhanced, and the damage load is greatly increased.
5. Easy to use and light in weight: The weight of the product is only about one-third of the cast iron. The technical requirements of the cast iron manhole cover are convenient for transportation, installation and repair, which greatly reduces the labor intensity.
6. Anti-theft: The resin inspection manhole cover has no recycling value and is naturally anti-theft; according to customer needs, it is equipped with a locking structure to realize the anti-theft of the property in the well.
7. Strong weather resistance: The resin inspection manhole cover can be used normally in the environment of -50℃～+300℃ through scientific formula, advanced technology and perfect technical equipment.
8. Acid and alkali resistance, corrosion resistance, wear resistance, vehicle rolling resistance, long service life.
Application:
ductile iron castings have almost been used in all major industrial sectors, which require high strength, plasticity, toughness, wear resistance, resistance to severe thermal and mechanical shocks, high or low temperature resistance, corrosion resistance, and dimensional stability. In order to meet these changes in the conditions of use, there are many grades of ductile cast iron that provide a wide range of mechanical and physical properties.
