In urban drainage system construction, single grates serve as the first point of entry for stormwater collection, and their performance directly impacts drainage efficiency, road safety, and municipal maintenance costs. Traditional grates often suffer from problems such as insufficient load-bearing capacity, susceptibility to clogging, and poor anti-theft performance, while ordinary cast iron grates experience early damage or deformation due to unstable material properties. The Luzhongbao Ductile Iron Single Grate, based on the material advantages of ductile iron and innovative structural design, successfully overcomes the technical defects of traditional drainage facilities through scientific drainage hole arrangement and a reinforced support system, and has now become the ideal choice for projects like municipal roads and park drainage.
This product strictly complies with national standards and is precision-cast using QT500-7 grade ductile iron. Ductile iron obtains a spheroidal graphite structure through spheroidization and inoculation treatment, giving it comprehensive properties approaching those of steel. Its tensile strength exceeds 500 MPa, elongation exceeds 7%, and its corrosion resistance is five times that of ordinary steel pipes. The unique structural design enables loads to be evenly distributed, effectively avoiding stress concentration phenomena and significantly improving the product's service life.
Material Advantages and Process Innovation
The core material of the Luzhongbao Ductile Iron Single Grate selects QT500-7 ductile iron. Its spheroidal graphite microstructure gives the material excellent mechanical properties. Tensile strength exceeds 500 MPa, and elongation exceeds 7%, combining high strength with good toughness. This material characteristic enables the product to withstand D400 grade loads, with a test load exceeding 400 kN, fully meeting the demands of urban arterial roads and heavy vehicle traffic.
The casting process uses resin sand molding technology and an intelligent control system, ensuring precise product dimensions, a smooth surface, and a dense, uniform internal structure. The unique openable structure connects the movable cover to the fixed cover via a pin shaft, allowing quick opening and closing without large machinery, significantly improving maintenance efficiency. Dual protection of surface hot-dip galvanizing and epoxy asphalt coating gives the product a corrosion-resistant service life exceeding 50 years, far surpassing the service life of traditional grates.
Structural Design and Functional Characteristics
1.Efficient Drainage and Anti-Clogging Design:
The drainage hole layout is optimized through fluid dynamics simulation, using gradually expanding hole shapes and curved drainage channels to effectively increase the water flow area and reduce debris ingress. Actual measurements show drainage efficiency remains above 95% even under rainfall intensity of 150 mm/h, and it effectively intercepts debris like leaves.
2.Multiple Safety Protections:
Anti-theft: Built-in hinges and a dedicated locking system require specific tools to open, preventing illegal removal.
Anti-slip: The surface has raised 3mm patterns with a friction coefficient exceeding 80 BPN, ensuring pedestrian safety in rainy or snowy weather.
Anti-settlement: The frame is fixed to the road base with anchor bolts, preventing displacement caused by vehicle traffic or settlement around the manhole.
3.Shock and Noise Prevention System:
A U-shaped groove is set at the frame register, embedded with a T-shaped synthetic rubber strip. This acts as a buffer when vehicles pass, reducing vibration and noise by overcoming hardness with softness.
Load-Bearing Performance and Durability
The product load-bearing class reaches the D400 standard, with a test load exceeding 400 kN, capable of withstanding heavy vehicle traffic over 36 tons. The internal grid-pattern reinforcement rib layout forms a spatial load-bearing system, effectively dispersing loads and avoiding stress concentration. Verified by salt spray tests, the zinc layer forms a metallurgical bond with the substrate, improving corrosion resistance by more than three times.
The inherent corrosion resistance and oxidation resistance of ductile iron itself exceed those of cast steel. In most municipal application areas, such as water, salt water, steam, etc., the corrosion resistance and oxidation resistance of ductile iron exceed those of cast steel, with a design life exceeding 30 years.
Construction Convenience and Economic Benefits
Modular design improves installation efficiency by over 50%. The grate can be paved and rolled simultaneously with the asphalt road surface, requiring no concrete curing time. Installation time per unit does not exceed 30 minutes. From a whole-life-cycle cost analysis, the product's long service life and low maintenance requirements reduce comprehensive costs by 35%–40%.
For example, in a certain district renovation project, after replacing the original steel fiber storm drain grates with ductile iron storm drain grates, the maintenance frequency was reduced by 80%, significantly saving maintenance funds. Its quick installation feature also significantly shortened the construction period, reducing the impact on traffic and the environment.
Application Scenarios and Adaptation Performance
The product can adapt to various drainage scenarios such as municipal roads, expressways, and residential areas. Standard sizes cover mainstream manhole needs, and surface treatment processes can be customized to suit special environments. Its compact structure and quick-opening feature make it particularly suitable for emergency drainage in areas with high rainfall frequency.
Summary
The Luzhongbao Ductile Iron Single Grate, with its innovative structural design, exceptional load-bearing performance, long-term durability, and construction convenience, has become the preferred solution for modern urban drainage construction. It not only solves the pain points of traditional grates regarding clogging, difficult maintenance, and short service life but also, through its modular design and multiple protective functions, provides reliable assurance for the efficient operation of urban drainage systems. Choosing this product means injecting lasting quality assurance and whole-life-cycle economic benefits into the engineering project, which is the core reason for its continued recognition in the market competition.
