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Contiguous / Secant Piled Walls

Need advice on retaining wall structures?
Pennine Geotechnical Services have extensive knowledge of which solution works best in which individual circumstance.

Contiguous Piled Walls:
A contiguous pile wall is a retaining wall consisting of concrete bored piles installed in a continuous gap spaced linear configuration to form a retaining structure.β€―

They are both flexible in shape and design and offer a significant lateral strength advantage compared to that of other piled walls solutions.β€―

Contiguous bored piled walls are typically installed within dry and cohesive soil conditions, as the wall is not watertight and the soil between individual piles is exposed during excavation. Reinforced mesh and spray concrete can be applied as a lining to secure the exposed soil.β€―

Comment from Pennine Geotechnical expert: Martin:
β€œAt Pennine Geotechnical, we advocate the use of contiguous piling on works that require cost effectiveness and greater flexibility – we also utilise them for difficult / challenging ground conditions and restricted access works.”

Secant Piled Walls:
A secant pile wall is a bored pile retaining wall formed by installing interlocking primary and secondary piles to form a robust and continuous retaining structure. Secant pile walls are flexible in shape and design compared to diaphragm retaining walls and offer a significant lateral strength advantage compared to that of sheet piled walls.β€―

The composition of piles used can vary depending on soil type, ground water profile, retained heights, available construction time, propping arrangement, cost, and design life.

Comment from Pennine Geotechnical expert: Martin:

“As with contiguous piling, secant pile walling offers great flexibility which suits works carried out on complex site boundaries and/or challenging underground structures. We design and implement secant piling to suit the overall parameters of the client project.”

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