Method and apparatus of removing liquid from underground cavity

Details Method and apparatus of removing liquid from underground cavity Method and apparatus of removing liquid from underground cavity

1997-02-12

2000-06-13

Ferensic, Denise L.

Pipes and tubular conduits

Structure

138178, 138DIG11, 166233, 166234, 166235, 405 45, 405128, F16L 900

Patent

active

060736593

ABSTRACT:
Underground cavities containing liquid contaminants are remediated by drilling directionally through the cavity and then pulling back pipe with a slotted section extending through the cavity. The pipe is supplied on reels in lengths much longer than in the prior art, thus avoiding the joining by butt welding of successive short lengths of pipe as in the prior art. Slots are preferably cut parallel to the axis of the pipe or at a angle in respect to the axis instead of being cut radially as in the prior art, so that a much greater portion of the pipe circumference remains joined together, thereby substantially increasing the axial strength of the pipe.

REFERENCES:
patent: 1785071 (1929-02-01), Coberly
patent: 3275081 (1966-09-01), Beylik
patent: 3709293 (1973-01-01), Layne, II et al.
patent: 3753352 (1973-08-01), McNally
patent: 4133379 (1979-01-01), Nuzman et al.
patent: 4163619 (1979-08-01), Fales
patent: 4246936 (1981-01-01), Luz et al.
patent: 5046892 (1991-09-01), Kothman

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