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Double rotary drilling combines continuous flight auger drilling with a continuous casing. Casing and auger (inside the casing) are simultaneously installed and extracted. Double rotary drilling is applied for the production of cast-in-place piles and for predrilling.
1. Positioning at the drilling point
2. Auger drilling with simultaneous advance of the casing
3. Extraction of auger and casing while concrete is pumped in through hollow stern
4. Inserting the reinforcement
5. Finished pile
The video shows two jobsites with double rotary drilling for producing cast-in-place piles.
This method combines continuous flight auger drilling with a casing. It is mainly applied for producing cast-in-place piles.
Two rotary drives are separately mounted on the sledge and independently drive the inner continuous flight auger and the casing.
During the drilling process the auger flights convey the drill cuttings to the surface inside the casing. Through an opening at the upper end of the auger the drill cuttings are ejected.
The compact design of the double rotary head allows operation very close to existing building structures, i.e. in front of building walls.
A protection cover encloses the casing so creating an annular space inside. Thus, the ejected drill cuttings fall to the ground in a controlled manner.
After their extraction, casing and auger are swung to the side and emptied by rotating the auger in the reverse direction.
After the final depth has been reached concrete is pumped through the auger’s hollow stem. During the extraction process the concrete exits at the lower end of casing and auger.
After concreting a reinforcement cage can be inserted in the column of fresh concrete. For this purpose the auxiliary winch of the carrier machine is used.
Pile wall must be installed for the foundation of residential and business premises in an extremely tight space.
320 piles for new build logistic centre.
The LRB 355 requires, under optimum conditions, only 14 minutes to complete a cast-in-place pile.
The powerfull piling and drilling rig LRB 355 installs 316 piles for a secant pile wall.
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