Partial displacement bored piles
Many advantages in one.
PDP stands for partial displacement bored piles.
This method is chiefly used where the more cost-effective driven piles may not be used for environmental reasons, or where screwed piles are not capable of reaching the required casing depth, owing to the soil type on the site.
Stump-Franki PDP piles are screwed into the ground using an auger drill with a large hollow auger stem diameter. This technique involves simultaneous lateral soil displacement and only partial progress to a previously determined depth. The auger drill is equipped with a waterproof seal in the form of a non-recoverable foot plate. After the reinforcement cage has been inserted into the hollow auger stem, concrete is pumped in and filled right up to the surface. The auger drill is then removed. The foot plate detaches at this point and pumping and extraction continue as the vacated space is immediately backfilled with concrete.
Shorter setup times and rapid pile fabrication make Stump-Franki’s PDP piles a very economical option, requiring shorter construction periods in comparison to other DIN EN 1536 pile systems. The displacement effect also means that PDP piles have a greater load bearing capacity than conventional bored piles.
Stump-Franki PDP piles are fabricated without vibration and with low noise. This pile system is therefore particularly suitable for foundation works in built-up areas and where neighbouring buildings are vulnerable to the effects of vibration.
The dimensioning and fabrication of Stump-Franki PDP piles are carried out in compliance with DIN EN 1536 and EA pile specifications.
- Partial soil displacement