METHOD FOR ERECTION OF VERTICAL DRAIN Russian patent published in 2013 - IPC E02B11/00 

FIELD: construction.

SUBSTANCE: method for erection of a vertical drain includes drilling of a well with simultaneous fixation of its walls with a casing pipe, where a casing filter string is lowered. Previously, before lowering of the filter string, a perforated pipe of smaller diameter is lowered into the well, and inside this pipe a filter pipe is lowered, which has been previously perforated and wrapped into a net of non-ferrous metal. Geotextile is wrapped onto the net, which is fixed by a copper wire. The perforated and filter pipes are aligned so that the distance between the inner wall of the perforated pipe and the filter pipe is identical along whole circumference. Then the space between the pipes is filled in layers with a sand and gravel mixture. A well pump is installed inside the filter pipe with installation of coupling pipes and electric cables. Afterwards the casing pipe is withdrawn from the well, and a conductor is arranged from the earth surface.

EFFECT: increased reliability of drain operation.

1 dwg