Process for rock consolidation and/or cavity filling e.g. in tunnel construction and mining
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United States of America Patent
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Jun 21, 1994
Grant Date -
N/A
app pub date -
Jul 29, 1992
filing date -
Dec 4, 1989
priority date (Note) -
Expired
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Abstract
A process is described for rock consolidation, e.g. in tunnel construction and mining, by injection of aqueous preparations of melamine resin condensates and/or urea formaldehyde condensates together with an acid curing agent. The process is characterized by the use of aqueous solutions of hydrogen sulfate salts, especially solutions of alkali and/or ammonium bisulfates, as curing agents. The curing agent solutions can contain additional auxiliary agents and active substances such as corrosion inhibitors, structurizers and adhesion agents. Preferred resin solutions for consolidation with these aqueous curing agents contain added zeolite NaA and/or hydrosodalite for increasing their serviceability, and especially for prolonging their storage life.
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