Patent ID: 7736091

Claim:
A method of inserting a drainage wick into a ground comprising a layer of hard soil situated underneath a layer of soft soil comprising the steps of: providing the drainage wick where a portion of said drainage wick is arranged so as to be transversely and/or longitudinally impermeable; determining a depth of an upper part of the hard soil layer; determining the portion of the drainage wick starting from the bottom end of the drainage wick to a point determined to fit a point of the soft soil layer, close to the upper part of the hard soil layer, but sufficiently distant of the upper part of the hard soil layer to avoid water communication between the said soft soil layer and the said hard soil layer; arranging said portion of the drainage wick so as to be transversely and/or longitudinally impermeable; threading said drainage wick through an inserting tube; fixing an anchorage component to said drainage wick extending out of said inserting tube; driving said anchorage component, said drainage wick and said inserting tube downwardly into the ground; where said anchorage component and said drainage wick are driven downwardly into the layer of hard soil situated underneath the layer of soft soil and said anchorage component and said drainage wick are permitted to remain in said layer of hard soil; and pulling up said inserting tube whereby said anchorage component and said drainage wick are permitted to remain in said ground.