A vertical drain

摘要

A vertical drain (1) for draining fluid from ground soil, which drain comprises an elongate core (2) having one or more channels (5) extending along the length of the core (2) to receive fluid; electrically conductive means (4) extending substantially along the length of the core (2); and a filter (3) surrounding the core (2), wherein fluid from ground being consolidated passes through the filter (3) into the one or more channels (5) in the core (2).