Bored Piles

Bored Piling is especially suited to boring through hard strata, as they are often larger in diameter than a continuous flight augur (CFA) piling method and can penetrate through difficult ground obstructions. Bored Piles are more compact than other conventional methods, allowing work to be delivered within confined sites.

The rotary bored technique is performed by drilling through a temporary casing to the designed depth, using an auger, eliminating any spoils. The casing supports the pile through to ground until the required depth is achieved, the auger is then removed, and the concrete is poured in situ. The term replacement pile is often used as opposed to displacement piles where soil is forced away by driving the pile in place.

A bored pile foundation is a type of reinforced-concrete foundation that supports structures with heavy vertical loads. Unliked driven precast piles, a bored piles is cast-in-place using concrete on site.

• Bored piles can be design for high lateral loadings and vertical loadings
• Piles can be installed in close proximity of existing structures and buildings
• Pile sizes can range from variable lengths, 600mm to 2000mm diameters and up to 50m deep which allows the pile to extend through soft, compressible, or swelling soils into the suitable bearing material
• The need for large excavations and backfill is lessened due to the type of technique
• Therefore, there is less disruption to adjacent soils
• Vibration is relatively low, reducing disturbance to the surrounding environment

Like any other deep foundation system, bored piles present challenges for the contractor. Because the drilling method used depends on the soil type, the contractor must complete a thorough soil investigation and report. The piling contractor relies on the soil report and past experience to choose the best drilling method that will minimize the disturbance of the surrounding soil.

When the soil is cohesion-less, such as with sand, gravel, and silt, or the hole extends below the water table, the hole must be supported using steel cages or stabilizing mud, such as bentonite suspension.

With over 30 years of experience, choosing Aarsleff Ground Engineering as your piling contractor for your rotary bored services means a bespoke value-engineered design and install solution for a wide range of schemes. These include civil, commercial, residential, energy and infrastructure. Our extensive range of rigs, machinery and equipment allows us to install and build tighter vertical retaining walls, at desired height.