Steelgrid HR30 system
Steelgrid HR30 system
Maccaferri Steelgrid® HR30 System is an innovative complete system for rockfall mitigation and slope consolidation works. It is used as a drapery or as a high stiffness (low extension) bolted facing when anticipated loads exceed the capability of traditional DT Mesh.
Fig. 1: Steelgrid® HR30 at site
Fig. 2: Comparison chart of load bearing capacity between Steelgrid® HR30 and conventional double twisted mesh
The Steelgrid® HR30 System combines a patented high strength steel wire mesh geocomposite which is used in conjunction with anchor plates, specific U-bolts and mesh connectors. Steelgrid® HR30 is a breakthrough in composite mesh technology offering high stiffness: high tensile strength at low strain and high punch resistance with low deformation.
Fig.3: HR grip Fig. 4: HR plate Fig. 5: HR link
This patented mesh is an engineered combination of double twist steel wire mesh and high tensile (1770N/ mm2) wire ropes in a single, easy to install product. Steelgrid® HR30 is available in a variety of strengths (up to 180kN/m tensile resistance and up to 155 kN/m for punch resistance), enabling to optimise solutions both technically and commercially.
Fig. 6: Positions of HR grip and HR link in Steelgrid® HR30 system
The product is available in two levels of corrosion resistance:
Steelgrid® HR30: Mesh wires and ropes galvanised with GalMac® (Zn/Al) alloy Class A
Steelgrid® HR-PVC: As Steelgrid® HR30, but with an additional continuous polymer coating on mesh and ropes.
When site conditions are more aggressive (for example in some locations next to the sea), or the project demands a longer design life than that offered by the Class A GalMac® (Zn/Al) coating, PVC coated Steelgrid® HR30 is uniquely able to provide reliable long term performance
Installation of Steelgrid® HR is straightforward; the adjacent lateral rolls of mesh do not need to be overlapped, reducing product wastage and saving installation cost and time compared to other meshes.
Fig. 7: Layout and installation of meshes
Fig. 8: Installation of Steelgrid® HR30 system on site as “Top-down”method
4. TECHNICAL SPECIFICATIONS
Technical specifications of Steelgrid® HR30