The Luzhongbao 550×10 cast iron anti-falling net is a high-strength safety protection device specifically designed for vertical channels such as urban underground inspection shafts and pipeline shafts. Its standard inner diameter of 550mm fits most municipal shaft openings, and the 10mm thickened cast iron mesh structure can withstand instantaneous impact loads exceeding 1000kg. The product strictly complies with the GB/T 23858 national standard and is manufactured through one-time casting using QT500-7 grade ductile iron. Through unique annular grid densification technology and a three-dimensional reinforcement rib support system, it achieves a balance between protection strength and ventilation/light transmission within a limited space, effectively preventing accidental falls of personnel or small objects. It is particularly suitable for areas with high public safety requirements such as schools, plazas, and old residential communities.
Compared to ordinary anti-falling nets, Luzhongbao establishes overwhelming advantages in five core dimensions: First, a breakthrough in material science using QT500-7 grade ductile iron, with tensile strength ≥500 MPa and yield strength ≥320 MPa, increasing load-bearing capacity by over 50% compared to ordinary cast iron anti-falling nets. Second, innovative structural design: the mesh openings adopt a 36° inclined cross layout, with the aperture precisely controlled within 20mm, preventing both foot entrapment and the falling of items like mobile phones. Third, upgraded anti-corrosion technology: a triple protective coating (hot-dip galvanizing + epoxy asphalt + nano sealant) gives the product a service life of 25 years in acidic, alkaline, and humid environments, far exceeding the industry average of 8-10 years. Fourth, innovative installation method: the patented "Elastic Tension Anchoring System" requires no drilling or welding, enabling installation in just 3 minutes. Fifth, integrated smart operation and maintenance: optional strain sensors for real-time monitoring of the mesh load status, providing early warnings of safety hazards via an IoT platform.
Military-Grade Materials and Structural Science
Utilizes QT500-7 ductile iron, whose spheroidal graphite microstructure effectively blocks crack propagation, giving the material both high strength and toughness under extreme impact. The mesh body incorporates radially distributed reinforcement ribs internally, with key nodes employing a bidirectional cross-support design. Optimized through finite element analysis, deformation resistance is improved by 60%. Compared to the low-carbon steel (tensile strength only 300-400 MPa) used in ordinary anti-falling nets, Luzhongbao maximizes load distribution efficiency at the same weight, with a measured impact resistance of 150 kJ/m², exceeding the D400 grade protection standard.
Comprehensive Safety Protection System
Fall Prevention Guarantee: The mesh body underwent a test with a 1.5-ton weight dropped from 10 meters (simulating a high-speed adult fall), resulting in post-impact deformation < 3mm, far exceeding the national standard requirement of a 5mm limit.
Anti-Corrosion Design: The base material undergoes 290°C high-temperature hot-dip galvanizing (zinc layer thickness ≥100μm), combined with an epoxy asphalt coating and nano sealant. It passed a 6000-hour salt spray test (equivalent to 25 years of use in coastal environments), achieving the highest C5 grade anti-corrosion performance standard.
Anti-Failure Mechanism: Connection points use a redundant anchoring structure; the 8 anchor points bear weight independently, and the failure of a single anchor point does not affect the overall protective performance.
User-Friendly Design and Convenient Operation & Maintenance
The mesh surface features a micro-arc treatment to avoid cuts from sharp edges. The 20mm standardized mesh openings ensure ventilation and light transmission while preventing children's heads from getting stuck. The installation system innovatively uses pre-tightened clamps that snap directly into the shaft wall without specialized tools, supporting over 50 repeated installations and removals without deformation. For operation and maintenance, it integrates an RFID electronic ID; scanning the code provides access to production information, installation records, and inspection data, significantly reducing municipal management costs.
Scenario Adaptation and Rapid Response Capability
For different shaft depth requirements (2-15 meters), it offers a gradient strength series of products (Standard / Reinforced / Custom types). Supports 72-hour emergency delivery, with customized production capacity covering special scenarios like non-standard shaft openings and inclined shafts. The product has been successfully applied in 300+ municipal projects nationwide, including key projects such as the Beijing subway ventilation shaft renovation and Shanghai old community comprehensive improvement projects, having cumulatively intercepted over 200 fall risks while maintaining a zero-accident record.
Full Life Cycle Cost Advantage
Although the unit price is 15%-20% higher than ordinary anti-falling nets, the ultra-long service life of 25 years (ordinary products require replacement 2-3 times) and zero-maintenance characteristics result in a more than 40% reduction in full life cycle cost. Coupled with a blockchain traceability system, quality data from each step is recorded on the chain in real time
