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Arma Piling
235-239 High Road, Ashley House Unit 312 London N22 8HF
Rotary Bored Piling London
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Rotary Bored Piling London
If your project in London demands deep foundations capable of supporting very high loads—especially where pile depth is somewhat constrained—Rotary Bored Piling (RBA) is an excellent choice. At Arma Piling, we specialise in delivering robust RBA / rotary bored piling services throughout London and surrounding areas, using state‑of‑the‑art rigs and precision engineering.
What Is Rotary Bored Piling (RBA)?
Rotary Bored Piling (often called open‑bore or bored cast‑in‑place piling) uses powerful rotary rigs and augers to form deep boreholes, which are then filled with concrete (and reinforcement) to become a structural pile. Unlike driven piling, there is little vibration and noise, which makes it suitable for urban environments.
Key points:
- The method is suited for high load pile capacity when pile depth cannot extend indefinitely.
- Rigs can handle large diameters, enabling a solid ground bearing base even when depth is limited (e.g. ~25 m).
- It works particularly well in clay or chalk conditions, where an open bore can be formed without needing to constantly use the auger for concreting.
- The process involves progressively increasing the depth, extracting spoil via the auger, sometimes using temporary casing or support fluids to stabilize the bore.
Get in touch with us – we’ll help you bring your project to life from the ground up.
How the Rotary Bored Piling Process Works
- Site investigation & planning
We assess soil conditions, the load requirements, and constraints (site access, nearby structures). - Drilling / Augering
A telescopic Kelly bar (or similar) carries an auger, which spins into the ground at shallow increments (e.g. 1–1.5 m increments). - Spoil removal
After drilling, the auger (and casing, if used) removes the soil to clear the bore. - Stabilization (if needed)
In unstable zones, we may use temporary casing or drilling fluids (e.g. bentonite) to keep the bore intact while drilling deeper. - Reinforcement cage installation
Steel reinforcement is lowered into the bore to strengthen the pile. - Concrete placement
Concrete (or grout) is poured—often by tremie method—to avoid segregation and ensure full compaction from the base upward. - Casing removal / finishing
If casing was used, it’s removed (or left in place, depending on method), and the pile is trimmed to correct level.
