Page 10 - GDL - EARTHWORKS GROUND IMPROVEMENT PILING

DEEP SOIL MIXING: TURBOJET COLUMNS
Turbojet deep soil mixing is a combination of mechanical mixing and jet grouting. It can be used to improve the engineering properties of soils, including peat, which are considered to be soft or very soft to depths of up to 25 metres.
When compared with mechanical deep soil mixing, Turbojet DSM can be used in a wider range of soil types, and it can achieve higher rates of production and more effective mixing which results ultimately in a higher quality soil mixed column. Importantly, Turbojet DSM is very effective in high plasticity clay soils, where standard mechanical deep soil mixing techniques are not effective.
The Process
Grout is injected at very high pressure through a series of outlet nozzles blending soil as the mixing tool advances. High pressure cutting is effective in most soil types including problematic cohesive plastic clays. The mechanical mixing of grout and soil is achieved using a mixing tool featuring cutting teeth, blades and a mixing head. The type and con guration of tool is selected for project speci c requirements and soil types.
We select the type of binder and application rate depending on soil type and project requirements. Grout mix selection is based on our geotechnical site investigations, laboratory testing and eld trials
and experience. Grout is batched using an automated GM30 grout batching plant featuring automated electronic weighing of up to three binder components, accurately controlled water injection and a series of high sheer mixer and agitator tanks. Grout is delivered to the mixing tool using a high pressure 7T600J triplex piston pump capable of delivering pressure up to 800 Bar (11,600 PSI). Grout pressure is fully variable, being selected depending on the soil types and the column mix design.
Applications
• Road and railway embankments
• Building and house foundations
• Storage tanks
• Slurry cut-off walls
• Hardstanding’s
• Bridge abutments
• Retaining walls
Technical data
• Columns diameter: 600 to 2400 mm
• Columns depth: up to 25 m depending on column diameter
and consistency