Chemical Grouting

Chemical grouts do not stop leaks simply by filling joints and cracks. Instead, grout is forced through joints and cracks and into the surrounding soil where it solidifies with the soil to form a waterproof mass.

Sealing Manholes with Chemical Grout:
Chemical grout stops water infiltration and seepage into all types of manholes. Gel-type chemical grout is injected from the inside of the manhole to the outside to form a gel curtain around the outside of the manhole. The gel curtain prevents ground water from flowing into the manhole and stabilizes the soil. The stabilization of the soil helps to prevent ground water from washing away the supporting soil. In pre-cast manholes, urethane foam grouts are sometimes used to rebuild the gaskets in the joints.

Sealing Service Lateral Connections with Chemical Grout:
Service laterals are often a source of significant infiltration. Studies have shown that most infiltration into service lines occurs within a few feet of the main. The two primary reasons for this are that all except the last few feet of service lines are usually above the water table, and groundwater flows easily in the backfill of a mainline trench because of the French drain effect. This means that a poorly constructed or mainline lateral connection can be a significant source of infiltration that is easily addressed with chemical grout and specially designed lateral/mainline sealing equipment.