Chemical grouting can be used to stabilize soils for tunneling, control water seepage, and provide excavation support. Chemical grout is injected under pressure in order to permeate soils and create a homogeneous mass with increased strength and reduced permeability.
In many applications,a sleeve port pipe (tube-a-manchette),containing rubber sleeves over pre-drilled holes, or ports, for injection, is installed into a drilled hole. This allows the chemical grout to be injected at discrete locations along the sleeve port pipe. The rubber sleeves are equally spaced and permit multiple grout injections through the same sleeve.
The more commonly used chemical grouts include polyurethane,epoxy,acrylate.