Method for repairing underground sewer lines

Details Method for repairing underground sewer lines Method for repairing underground sewer lines

1989-09-29

1990-05-01

Taylor, Dennis L.

Hydraulic and earth engineering

Subterranean or submarine pipe or cable laying, retrieving,...

405157, 405267, 138 99, 175 67, 73 407, F16L 55175

Patent

active

049213741

ABSTRACT:
A process for repairing underground sewer lines by preventing the infiltration of groundwater into a leaking sewer line comprising determining the location of the leakage into the sewer line, vacuum excavating a bore into the ground to the sewer line in the vicinity of the leak, depositing a quantity of a water swellable material such as an argillaceous material selected from the group consisting of bentonite and attapulgite into the bore to a depth of at least about one foot above the sewer line, tamping the argillaceous material in the bore, depositing a quantity of gravel over the argillaceous material in the bore, and backfilling the excavation. The water-swellable material also contains a dye which will infiltrate into the sewer line until the leak is sealed. Through a downstream inspection, the presence or absence of the dye indicates whether water infiltration into the sewer line has stopped.

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patent: 4546649 (1985-10-01), Kantor
patent: 4580442 (1986-04-01), Jones

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