Pressure grouting is the process of raising sunken or deformed
foundations by the use of hydraulic pressure, and then filling in
the void created with concrete grout. Pressure grouting is generally
used for large voids beneath the foundation surface.
The first step in pressure grouting is to determine the locations
of the desired holes to be drilled that will best stabilize the
foundation. Once the desired location for the holes has been
determined, the drilling is done. Concrete grout is then pumped into
the holes at high pressure until the concrete comes into contact
with the existing foundation. While the concrete is pumped into the
drilled holes, the hydraulic lifts maintain an even surface. As soon
as the void beneath the foundation surface has been filled properly,
the holes are refilled.
Pressure grouting should be used to stabilize a large surface
area.
