Driven anchor piles

Various steel sections and precast concrete piles can be used as anchor piles. Anchor piles carry the tensile forces on their surface by way of skin friction. They are frequently encountered in quay wall structures in which high tensile forces occur (as the follow picture shows). In such cases, steel piles enable a straightforward welded connection between pile and retaining wall structure.

Driven piles at shallow angles are guided by leaders. Slow-action hammers are preferred to rapid-action devices (EAU 2004 section 9.5.2). In the case of raking anchor piles, settlement due to back filling, relieving excavations or the installation of further piles behind the sheet pile wall can lead to loads at an angle to the axis of the pile. The additional deformations cause an increase in the stresses in the pile which in some circumstances means that the maximum axial force may not occur at the head of the pile but instead behind the sheet pile wall (see M ARD- FELDT, 2006). This must be taken into account when designing the piles and the connection to the wall.