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Deep injection grouting –
Pressure Grouting is the process of pumping a cement or chemical grout into soft or weak strata of soil or voids. The grout fills these voids, thus stabilizing and strengthening the soil. Pressure Grouting has many applications. One of these includes support for existing structures or where foundations have shifted.
1: The purpose of Pressure Grouting is to control the amount of grout going into the pipe. As the process is repeated at additional elevations, the soil is compacted.
2: The process begins with the pumping of grout at the lowest elevation. The pipes are withdrawn slightly and the grout is allowed to set.
3: The process is repeated at the next elevation. Upon completion, the pipe is again withdrawn slightly to the next elevation. The grout is allowed to set. Each level of grout pumping will push the soil upward.
4: The number of grout pumpings at these different elevations that are needed to compact the soil will vary. Once the soil is compacted, it causes lift. This lift then pushes the footing and wall upward.
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