Cantilever quay

A cantilever quay is a berthing wall in which a single line of large-diameter bored or driven piles, fixed in the seabed, resists earth and berthing loads in cantilever bending without anchors or tie-rods. The piles act as vertical cantilevers from their point of fixity below dredge level, so embedment depth and section modulus govern the design rather than dead weight. This form suits moderate retained heights where an anchored sheet-pile wall or a relieving platform is not warranted, and it keeps the apron free of tie-rods and anchor walls. Bending and deflection are checked to BS 6349-2 with active earth pressure plus surcharge, fender, and bollard loads.