How are Jet Grouting columns made ?
Jet grouting is carried out using a drilling rig which injects a grout jet into the desired soil depth, in order to erode the soil around the rods and mix it with the grout up to a certain distance.
“Very high-pressure” equipment is used to pump the grout through one or more small-diameter nozzles placed at the end of the drill rods. A sudden reduction in diameter between the rods and the nozzle considerably accelerates the speed of the fluid to form a liquid jet.
A column is formed by rotating the rods and gradually raising them. This makes it possible to gradually create structures formed of several intersecting columns.
During the construction of a jet grouting column, the surplus materials (a mixture of soil, water and cement) are recovered on the surface for disposal in landfill.