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.
Piles are known as large diameter piles if they are 600 mm or more in diameter. Small diameter piles of less than 600 mm are sometimes placed in groups under a common pile cap to receive heavy loads.
Large diameter piles can have their bearing capacity increased by under-reaming the shaft at the base. This is achieved by an expanding cutting tool which cuts a conical-shaped base up to three times the diameter of the main shaft.
A Bored pile is best used for tall structures, heavy vertical loads, and brick work.
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.
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.
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