Key tectonic tecnologies about plastic concrete cutoff wall in Liaoning Hongyanhe nuclear power plant

The plastic concrete cutoff wall is used at the riprap cofferdam.This is rare for cutoff wall construction,especially when used in the larger sized rock riprap breakwater.It has more than 40% porosity and strong protection against leakage.With the successful use of "leakage stratum formation control technology","air-lift reverse circulation slag to dig a hole technology",and the other technologies,we can overcome the difficulties such as leakage and hole-collapse,and make a groove through the built hole.According to the design requirements,the successful use of plastic concrete forms the continuous underground cutoff wall.Practice has proved that the rational use of several key technologies can effectively solve the technical problems of riprap embankment in the cut-off wall construction.