Drilling methods

Our drilling methods at a glance

Cased CFA method

To construct slim pile walls in the direct vicinity of existing buildings, the Cased CFA twin rotary system was developed. Using two drill drives rotating in opposite directions, a long casing and an internal auger are simultaneously screwed into the soil. This method is used to construct both separated and secant pile walls as well as individual piles.

Auger drilling

Fast attachment of different drill drives is made possible thanks to a quick-change mechanism. This makes it possible execute in-situ concrete piles using the continuous flight auger method (CFA) as well as preliminary drilling. Preliminary drilling is required if the introduction of piling material is made difficult due to obstacles.

Kelly drilling

Classic pile drilling system in which the torque and crowd force are transferred to the tool using a telescopic Kelly bar.

  • Support to prevent borehole migration using excess fluid pressure or casings. Installation of casings with rotary drive or with attached rotary casing machines
  • By using various drilling tools (with diameters from 600 to 1,500 mm), application is possible in all soil types including rock.
  • Drilling depths up to 40 m

DTH – down-the-hole hammer

Boreholes in hard to very hard bedrock are frequently drilled using the DTH down-the-hole hammer drilling method. The harder the rock, the greater the benefit of this process. A powerful compressor is a key prerequisite, since compressed air is used to drive the hammer and discharge drilling debris.

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Franz-Werner Gerressen
Head of Process Development
franz-werner.gerressen@bauer.de
+49 8252 97-0