Chemical Grouting to Stop Water Seepage into Utility Chamber

Location: Guelph, ON
Sector: Utilities
Category: Chemical Grouting

Description

Due to the high water table present in the region, an underground water main chamber encountered an unavoidable inflow of water through the precast segment joints.

Working within the chamber, a series of parallel holes were drilled directly into the joints voids at a depth of 4 inches between the precast segments. Packers were installed into the drilled holes and flushed with Water/Acid solution to rid debris from holes and the voids. Chemical grout was then injected into the joints, filling the void and creating a semi-rigid foam barrier.

Chemical grout injection using Multiurethanes Universal Resin, Universal Accelerator, 3/8″ plastic packers and two chemical grout pumps were used to seal the joints between the precast chamber segments. The technique eliminated the water leakage, allowing for the chamber to be returned to service.