Realignment of the highway produced an extensive steep cutting through the Rassau Industrial Estate section. Our excavator mounted TEI Hem560 drill masts used in conjunction with 35 tonne excavators and dipper extensions allowed us to access anchor positions up to 11.5m above road level whilst retaining the power and control required to efficiently drill in the very challenging fractured Quartzite bedrock prevalent at the site. The solution was designed by Arup Cardiff and included:
- Soil Nailing: Installation of 327 Dywidag R32 self drilling soil nails installed with 90mm full carbide button bits using two of our excavator mounted extended TEI Hem550 drilling masts.
- Meshing: Hanging and fixing of 2100 sq. metres of Geobrugg Tecco G65/3 Mech high tensile rockfall netting.
- Perimeter Cable and Finishing Details: 10mm diameter galvanised wire rope perimeter cables with turnbuckles at 25m centres.