Cement grout is injected under pressure into cracks voids or fissures in structures or ground (road sub grades etc.) This process is useful for repairing structure consolidating ground and forming water cut-offs, etc. This normally restores stability in a structure which has otherwise become unstable due to cracks or voids. Holes are drilled at selected points and cement grout, which is sufficiently fluid to ensure complete penetration, is pumped in.
Holes about 40 mm diameter may be drilled and at about 3 metres horizontal and 1 metre vertical distance apart. Cracks, joints and voids should be tapped by such holes. Holes must not be drilled right through the thickness of the mass under repair. Cracks should be cleaned by forcing water under pressure through the grout holes.
Ground of fairly hard nature but loose texture, etc. certain types of made-up soils, may be consolidated and have its bearing capacity increased by cementation. Pipes are driven into the ground and the cores within the pipes removed by means of an earth auger. Grout is then pumped into the ground through the pieces and penetrates into and fills the voids in the ground.
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