WHAT IS FULL DISPLACEMENT PILE

A Full Displacement Pile (FDP) is a cast-in-situ concrete pile installed by displacing and compacting surrounding soil laterally, rather than excavating it. Using specialized, high-torque drilling tools, FDP creates a vibration-free, low-spoil foundation ideal for soft soils, increasing bearing capacity through soil densification.

Key Characteristics and Process

· No Spoil/Low Waste: Because the soil is pushed aside, almost no spoil is generated, making it ideal for contaminated sites.

· Soil Compaction: The process densifies the surrounding soil, enhancing skin friction and pile bearing capacity.

· Installation Method: A specialized tool (displacement body) is rotated and pushed into the ground, followed by pumping concrete through a hollow stem as it is withdrawn.

· Reinforcement: A reinforcement cage is inserted into the fresh concrete after the tool is removed.

· Soil Suitability: Best suited for loose to medium-dense sands, gravels, silts, and soft clay.

Advantages

· Higher Load Capacity: Soil densification usually results in a stronger foundation.

· Vibration-Free: Suitable for urban areas or close to sensitive structures.

· Cost-Effective: Reduced costs for spoil disposal and concrete usage.

Components

· Drill rod/stem

· Displacement body

· Starter/Lost bit