Bored piles

In general, bored piles can be produced in a wide range of soils, such as very soft clay, densely bedded sands and rock. A wide variety of drilling techniques are used for this purpose and the appropriate excavation tools are used as required. Implenia offers the following methods for pile production with different diameters depending on the soil conditions:

• Rotary drilling method 
• Grapple drilling (grapple and bit)
• Reversed Circulation Method (RCD)
• Airlift method (and combination with RCD)
• Flush drilling method (for small diameters)
• Percussion drilling 
• Blast drilling

If necessary, we have equipment to sink boreholes using the following methods:

• Drop bears and hammers
• vibration (Vibrobär)
• oscillating (VRM)
• rotating (RDM)
• Pneumatic swing (Hochstrasser- Weise method)

If drill pipes are not required or cannot be used, the borehole can be stabilised with bentonite or polymer. If the surrounding soils are stable enough, the continuous flight auger method can be used without additional supporting methods. Our portfolio also includes the production of energy piles. These piles combine the absorption of the bearing load with the ability to extract thermal energy from the surrounding soil. Static and dynamic pile test loads as well as the O-cell test are among our standard practices. In this area, we have already carried out some vertical test loads with a force of up to 50 meganewtons.