Contiguous Wall Piles
A contiguous bored pile wall is formed by constructing a series of individual vertical RC piles. The diameter of each pile in a contiguous piled wall is usually not less than 300mm diameter.
Contiguous piles are suitable where the groundwater table is below excavation level. It is normally the most economic and rapid option. The wall consists of discrete piles typically installed at centres 150mm greater than their diameter, leaving gaps where soil is exposed during excavation.
Permanent works applications usually require an additional reinforced concrete lining wall to secure exposed soil, and resist long term groundwater pressures.
Once all the piles have been constructed, the top of the piles are usually joined together by an RC capping beam.
In self-supporting soils such as stiff clays, the sides of the holes will normally remain stable and can be concreted or grouted without the need for temporary casing. The ground between the completed piles will naturally span the gaps.
In non-self-supporting ground such as sands and gravels, the bored piles are generally temporarily cased. Where cased, the effective diameter of the completed pile will be that of the casing. Therefore a nominal 450mm diameter pile with a casing will have an effective diameter in the order of 510mm. This is an important consideration when determining the plan dimensions of a proposed new basement.
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