9.2.3 Pipes

There are a variety of grout pipe configurations available，depending on the type of grouting application.Single point，“push⁃in”or lance⁃type driven pipes may be used for certain applications in a wide range of soil conditions.Single point pipes are also commonly inserted in drilled（or jetted）holes，especially for significant depths and hard or difficult⁃to⁃penetrate soils，and packers forces the grout past the rubber sleeve，through the weak grout，and into the surrounding ground.The use of sleeved pipes has an additional advantage in that specific horizons may be regrouted by repositioning the injection point.