LZBMetal Ductile Iron Anti-Settlement Manhole Cover 650×850×190 91kg

LZBMetal Ductile Iron Anti-Settlement Manhole Cover 650×850×190, 91kg: A Permanent Levelness Commitment Forged by Ultra-Deep Frames.

Compared with many conventional anti-settlement covers on the market, LZBMetal has established systematic technical leadership with this 650×850×190, 91kg specification. While ordinary manufacturers simply increase wall thickness to barely meet load requirements, LZBMetal‘s advantage lies in achieving perfect integration of material strengthening, structural optimization, and long-lasting protection at a reasonable 91kg self-weight within a 190mm ultra-deep frame. Backed by advanced casting equipment imported from Germany, a portfolio of 98 invention patents, and precision manufacturing capacity exceeding 100,000 tons annually, LZBMetal has built an unassailable technical barrier across four key dimensions: innovative anti-settlement structure, material strengthening at the source, long-lasting corrosion protection, and precision dimensional control, providing a high-quality solution integrating safety, durability, and maintenance economy for heavy-duty urban road systems.

Core Advantages of LZBMetal Ductile Iron Anti-Settlement Manhole Cover 650×850×190

I. Ultra-Deep Frame and Wide Flange: Structural Innovation that Eliminates Settlement

The core technology of the LZBMetal Anti-Settlement Cover 650×850×190 lies in its integral wide-flange structure, with a flange width ≥150mm. Combined with the 190mm ultra-deep frame, it directly transfers loads borne by the cover to the road structural layers through the bottom extended edge, rather than having the brick well shaft bear them alone. This “socket-fit” connection method means the frame does not sit directly on the brick manhole. Traffic loads are dispersed through the flange surface to the road base, reducing pressure on the manhole structure by over 60%. The 91kg self-weight, combined with the 190mm ultra-deep frame, forms a stable and reliable anti-settlement system. The cover and frame become one with the road surface. Under external pressure, the cover settles with the road, maintaining perfect alignment with the pavement and fundamentally eliminating the “bouncing” phenomenon caused by uneven settlement.

II. Material Performance Exceeding National Standards: A Strong and Tough Load-Bearing Foundation

The LZBMetal Square Cover is manufactured from QT500-7 or higher grade high-quality ductile iron. Through the selection of high-purity raw materials and a unique rare earth magnesium alloy spheroidizing treatment, the material achieves a tensile strength stably exceeding 500 MPa, a yield strength ≥320 MPa, with elongation far surpassing national standard requirements. The nodularity rate stably exceeds 90%, ensuring a dense, defect-free structure. Compared with traditional gray iron covers, compressive performance is increased by 3-5 times. The product covers load ratings from D400 to E600, with D400 grade products achieving a test load of 400kN (approximately 40 tons), capable of withstanding high-frequency traffic pressure from heavy trucks, buses, and construction machinery. The 91kg self-weight results from dual effects of material strengthening and structural optimization, not from simply reducing wall thickness, ensuring superior impact and fatigue resistance.

III. Triple-Layer Anti-Corrosion System: Cross-Generational Protection for Durability

As an outdoor heavy-duty facility, the 650×850 square cover is continuously exposed to corrosive media such as rainwater, de-icing salts, and acid rain. LZBMetal has constructed a triple-layer anti-corrosion protection system: a base layer of hot-dip galvanizing (zinc thickness ≥80μm) providing cathodic protection, with the zinc-iron alloy layer tightly bonded to the substrate. When the cover surface is damaged, zinc corrodes preferentially, protecting the base material from rust. An intermediate epoxy resin coating forms a dense barrier, and a polyurethane topcoat enhances weather resistance. In conventional outdoor environments, the hot-dip galvanized layer gives manhole covers an anti-corrosion service life of over 30 years, far exceeding the 3-5 year lifespan of ordinary bitumen coatings. The entire system has passed over 3,000 hours of salt spray testing, significantly reducing life-cycle maintenance costs.

IV. Integrated Five-in-One Protection: Comprehensive Safety Performance

The LZBMetal Anti-Settlement Cover integrates five major functions: anti-theft, anti-fall, anti-noise, anti-slip, and anti-displacement, comprehensively improving urban road safety. Regarding noise reduction, an EPDM rubber gasket is embedded at the contact edge between the cover and frame, buffering impact from vehicle loads and eliminating metal-to-metal collision noise. Regarding theft prevention, a hidden bolt locking system is adopted, with bolt holes concealed beneath the cover edge, requiring special tools for opening and effectively preventing unauthorized theft. Regarding slip resistance, the surface features anti-slip patterns with depth ≥2mm and a friction coefficient ≥0.6, maintaining reliable slip resistance even in rainy and snowy conditions. Regarding displacement prevention, positioning bosses are designed on the inner side of the frame, cooperating with grooves on the cover edge to prevent cover shifting caused by vehicle side-loading.

V. Precision Manufacturing and Life-Cycle Value

LZBMetal‘s dimensional control capability far exceeds industry benchmarks. Its cover-frame fit gap is ≤1mm, far surpassing the national standard requirement of ≤8mm, ensuring stable, noiseless operation after installation and eliminating noise and bouncing during vehicle passage. The company has introduced advanced casting equipment from Germany, with sand mixing processing capacity of 240 tons and total annual production capacity exceeding 100,000 tons, achieving “consistent excellence across every product.” Analyzed from a life-cycle cost perspective, the LZBMetal Anti-Settlement Cover, with its exceptionally long maintenance-free period and extremely low failure rate, results in significantly lower total costs compared to cheap alternatives requiring frequent replacement and repair, truly achieving the transformation from a “cost expenditure” to a “value asset.”