Method of sealing off water-influx points in rock formations

Details Method of sealing off water-influx points in rock formations Method of sealing off water-influx points in rock formations

C - Chemistry, Metallurgy

09

K

C09K 17/00 (2006.01) C08G 18/28 (2006.01) C08G 18/66 (2006.01) C09K 8/508 (2006.01) C09K 17/30 (2006.01) E21B 33/138 (2006.01) C09K 7/00 (1995.01)

Patent

CA 2149029

(57) Abstract The invention concerns a method using a polyurethane for sealing off points through which water enters underground ex- cavations in loose rock and excavations at open-air building sites from the surrounding rock formations. The method calls for an isocyanate component (a) and a polyol component (b), to one or both of which auxiliaries and additives may be added, to be inti- mately mixed in a static mixer and the mixture obtained to be introduced under pressure into the rock formation through bore- holes or injection lances, primary or secondary di- or polyamines being added to the polyol component (b) in quantities such that the polyol remains in excess.

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