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Full displacement drilling
A single-pass drilling method
Full displacement drilling is a modified version of continuous flight auger drilling and is exclusively used for producing cast-in-place piles. The surrounding soil is only displaced and almost no drill cuttings are conveyed to the surface. Instead of a continuous auger a smooth casing is used. At the lower end the casing is fitted with a so-called displacement body.
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Leader
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Rotary drive
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Leader top for auxiliary rope
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Kelly extension
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Drive tube
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Displacer
Procedure for full displacement drilling:
1. Positioning at the drilling point
2. Auger drilling until the final depth is reached
3. Extracting the auger and pumping in concrete
4. Pressing or vibrating in the reinforcement
5. Finished pile
Video full displacement drilling
The video shows various Liebherr carrier machines working with full displacement tools.
Displacement body
The casing is equipped with a displacement body at the lower end.
Drilling
With full displacement drilling almost no drill cuttings are conveyed to the surface. The surrounding soil is only displaced.
Extraction of the casing
After the casing has been drilled down it is extracted again.
Concreting
During extraction the concrete is pumped through the hollow stem and exits at the lower end.
Reinforcement
Depending on the process the reinforcement cage can be inserted either before or directly after extraction of the casing.
Kelly extension
The drilling depth is increased when using a Kelly extension.
Drilling rig with fixed leader for drilling depths of more than 50 metres
With a lattice boom leader and crawler crane as carrier machine, cast-in-place piles of more than 50 metres in length can be produced.
Get in touch
If you have any further questions, please contact our local sales or service team.
