The Guu-Guann Dam, a concrete arch dam 82.5 meters in height, was damaged by the earthquake of Sept. 1999. The scope of repair work included sealing the leakage and repair shear cracks. The work included the use of borehole sampling and percussion echo detection of crack distribution, polyurethane resin injection grouting to fill oblique cracks;
A number of leak stoppage grouting attempts had failed to overcome theproblem of water leakage caused by longitudinal shrinkage of the ShilinDam.Due to seam shrinkage:adhesion, deformation rate, durability, and the need to have an instant-setting property,so as to avoid washout, had to be considered.The company employed polyimide resin injection grouting andsuccessfully completed the leak stoppage
Originally a riprap seawall, grouting was used to transform it into an impervious cofferdam.Grouting materials included: hot asphalt, SilicaShot-A, durable quick-setting material,(water-repellent material), and so on.Barrier thickness 4.2m, depth 13–7m, length 770 m.
Feitsui Dam has a height of 122.5 meters.The dam structure is directiondouble curve concrete arch, consisting of 29 separate sub-blocks.Dueto leakage through part of the block joints,work was needed to stop thisflow.So as that this project, in 1995, was proceeded to overcome this problem.The polyurethane resin injection was selected as the approach for this project.The
The Mingtan Power Plant has a 58-meter-high concrete gravity dam. Verticalcontraction joint leakage problems occurred, and with the water level at itshighest, the leakage rate was 2,100L/min.The main challenge of the project was how to achieve water stoppage effect, without blocking the original drainage pipes buried in the contraction joints.The solution to the water leakageproblem
To expand the Wanda Power Plant with the addition of No. 4 generator unit,an additional water intake facility had to be constructed at Wanda Reservoir.As the reservoir was still needed to continue its water storage function, it wasnecessary to carry out grouting of the cofferdam in two stages to retain the water,then two phases of