Embedded Retaining Walls
Contiguous Piled Retaining Walls
Contiguous piled retaining walls are formed using either Rotary or CFA piling techniques, piles are installed at close centres, with typically 100-200mm gaps between piles, piles are installed in a sequence determined by boring conditions These piles form temporary or permanent support to excavations. This techniques is suitable for basements, underground structures and motorway cuttings where working space is limited or adjacent to existing structures.
Secant Piled Retaining Walls
Secant piled retaining walls are also formed using either Rotary or CFA piling technics, alternate female piles are formed using a slow-gain (soft) concrete mix. The installation sequence is normally to install 1 pile every other 3 piles. After a sufficient curing period (2-4 days) and once each alternate pile is formed, the reinforced 'male' piles are installed using a standard (hard) concrete mix. The male and female piles overlap by approximately 75-100mm. The secant between male and female piles ensures that water ingress is minimised and fines wash-out is prevented.