(10) WO 2019/053615 Al
(57) The invention relates to a concrete precast unitary draining pile (2) and a draining retaining wall (1) comprising a plurality of these piles. The pile, of at least 4 metres in length and of a maximum diameter between 40 and 150 cm, is provided with a longitudinal opening (26) intended for draining water vertically through the pile. The retaining wall comprises a plurality of these piles, each pile comprising a first portion driven into a hole (50) in the ground (5) and a second portion extending vertically above the ground. The wall may...