Jet Grouting is used across the widest range of soil types of any other grouting system. It can be performed in one of three variations: single, double, or triple fluid system. It often results in construction schedule savings.
- Seal the bottom of planned excavations
- Underpin foundations
- Provide excavation support
Jet grouting creates in situ geometries of soilcrete (grouted soil), using a grouting monitor attached to the end of a drill stem. The jet grout monitor is advanced to the maximum treatment depth Then, high velocity grout jets (and sometimes water and air) are initiated from ports in the side of the monitor. The jets erode and mix the in situ soil as the drill stem and jet grout monitor are rotated and raised.
Depending on the application and types of soils, one of three variations is used: the single fluid system (slurry grout jet), the double fluid system (slurry grout jet surrounded by an air jet) and the triple fluid system (water jet surrounded by an air jet, with a lower grout jet). The jet grouting process constructs soilcrete panels, full columns, or partial columns with designed strength and/or permeability.
Jet grouting is effective across the widest range of soil types of any grouting system, including silts and most clays. Because it is an erosion-based system, soil erodibility plays a major role in predicting geometry, quality, and production. Cohesionless soils are typically more erodible by jet grouting than cohesive soils. The soilcrete geometry and physical properties are designed based on the in-situ soils.
Jet grouting’s ability to construct soilcrete in limited spaces and around subsurface obstacles such as utilities, provides unique design flexibility. In any situation requiring control of groundwater or excavation of unstable soil (water-bearing or otherwise) jet grouting should be considered.
Usually, jet grouting can be accomplished without disrupting normal facility operations. The development of containerized, highly mobile support equipment reduces mobilization and demobilization costs and time. Jet grouting can often result in construction schedule savings.
Christchurch, New Zealand
Christchurch Town Hall Restoration
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