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Bored Piles

Bored piles start with a minimum diameter of 600 mm and can reach a maximum diameter of 2500 mm.
Medium-diameter bored piles are defined as those with a diameter between 600 mm and 1000 mm.
Large-diameter bored piles are defined as those with a diameter between 1000 mm and 2500 mm.
Lengths can reach up to 40 m and beyond.

Soil Drilling Techniques

Drilling and borehole operations can be carried out using various techniques:

  • With the use of Bentonite mud
  • With the use of polymeric mud
  • Dry without casing
  • Dry with casing rotated into place
  • Dry with casing secured with a column clamp

Construction of Bored Piles

The construction of bored piles involves drilling the soil using hydraulic excavators equipped with circular section tools (buckets, augers, etc.).

Drilling is performed using stabilizing fluids (Bentonite and/or polymeric mud) or with complete casing of the borehole (in the presence of groundwater with the possibility of concrete washout) and, in special cases, completely dry (self-supporting soils).

Once the desired depth is reached, the reinforcement cage is inserted.
The concrete pouring phase is carried out using a jet tube with a hopper, with a length equal to the pile’s length.
This ensures that the concrete is poured from the bottom of the borehole (contractor method). The rise of the concrete results in the outflow of the stabilizing fluid from the borehole mouth, which is simultaneously aspirated and recirculated in the recycling system for reuse.

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