Spiral Drillers can construct drilled reinforced concrete piles up to 3.6m diametre, and to depths of up to 42m. Larger, deeper piles are constructed using our fixed mast machines while our fleet of pendulum rigs are used for smaller projects.
Belled piles can be belled up to 3600mm diametre with a special belling tool.
Grooved piles are achieved using a special grooving tool to the project specification.
Boreholes can be supported by temporary or permanent casings (caissons) as per soil conditions. Casing for all diameters can be installed and advanced ahead of drilling works using our various vibratory hammers.
In wet soil with high ground water levels, drilling can done using mineral (bentonite) or polymer slurries.