US 4,741,644 A · Environmental cut-off and drain

Abstract

High density polyethylene sheets are sealed at their lateral edges to form a sheath or envelope for sandwiching a drain mesh. A plurality of spaced apart bore holes is formed along the line of the cut-off and drain barrier and a coupling member is positioned, one in each bore hole, respectively, each coupling member having at least one locking keyway slot formed in a side thereof. These coupling members have stainless steel keyway protectors or cement stops so that cementious material cast in the bore holes so as to stabilize the coupling members do not fill the keyways. After the cementious material has set, the space between bore holes up to the keyway slots is excavated including the cementious material between the facing edges of the keyway material. Then the drain barrier with rigidifying perforated pipes secured in the ends thereof is inserted into the excavated slot with the perforated pipes being telescopically received in and retained by the keyway slots. After insertion of the drain barrier, the trench is backfilled with a material such as, cement bentonite backfill.

Claims11

Dependent claims

A method of constructing an underground drain barrier comprising,

excavating a pair of spaced apart bore holes,
positioning a coupling member in each bore hole, respectively, each coupling member having at least one locking keyway slot formed in an end thereof, each locking keyway having a removable cement stop member therein,
casting an excavatable cementious filling in each said bore holes around said coupling member, and allowing said cementious filling to set,
excavating, in the presence of liquid excavating slurry, the earth between said bore holes including the cementious filling between facing locking keyway slots,
removing said removable cement stop members,
positioning a plastic drain barrier in the space between said spaced apart bore holes, including sliding a pair of spaced apart hollow tubular members, perforated at least on the lower most surfaces thereof in said facing locking keyway slots, respectively,
said plastic drain barrier also including a sheath constituted by a pair of plastic films sandwiching a drain mesh net therebetween,
at least all underground edges of said plastic film being sealed to form a sheath.

5 more elements

Dependencies are inferred from the claim text.

Environmental cut-off and drain

Life of this patent

Environmental cut-off and drain

Life of this patent

Abstract

Claims11