Soil mixing

The soil mixing method involves mixing the existing soil with a binder slurry. This process significantly improves the soil’s mechanical and physical properties. The resulting columns overlap to create a continuous soil mixing wall that can be used for cut-off walls or temporary construction pit systems.

HEB beams can be inserted into the new panels to create low-deformation shoring walls. They can also be anchored using double U-beams.

The soil mixing walls bond with surrounding soil layers with low water permeability or with artificially produced sealing slabs to seal off the bottom of the construction pit against rising groundwater.

Areas of application include:

• Low-cost, low-deformation temporary construction pit systems with load-bearing elements
• Transverse bulkheads used to partition large construction pits
• Slope and embankment stabilisation
• Sealing dams
• Landfill enclosures
• Enclosure of contaminated land on brownfields or similar sites
• Subsoil improvement for greater load-bearing capacity
   

• Soil mixing walls provide a high degree of security due to their excellent sealing qualities.
• This method has exceedingly low in deformation when combined with load-bearing elements and anchoring.
• Soil mixing walls are a cost-effective shoring solution. The surrounding soil is utilised in- situ, rather than extracted. Minimising soil extraction cuts down on transport and disposal costs, especially for contaminated soils.
• The soil mixing method is environmentally friendly and has a low carbon footprint as it uses comparatively little cement.
• The method can be applied flexibly and adapted to a wide range of soil properties and other requirements.
• Shorter construction periods compared to bored pile walls save on costs and time
• Even surfaces yield a number of advantages for formwork and ensure economic efficiency.
• The method enjoys a high degree of acceptance among local residents because it is low-noise and vibration-free.
• Comparatively little space is required for the construction site facilities.
   

Standards and rules

Soil mixing walls are designed and manufactured in accordance with DIN EN 14 679 and the recommendations of the “Construction Pits” Working Group (Arbeitskreis “Baugruben”, EAB).

Production

The surrounding soil is mixed with cement slurry or custom mix using a frame leaded, double mixing paddle, so that a pair of columns is formed every time the mixing tool is lowered and retracted. A series of these soil concrete columns is produced to create a continuous cut-off wall. HEB profiles or double U-beams are used as static load-bearing elements.

Column diameters typically range between 50cm and 80cm, with typical bore depths of up to 16m.

We ensure high execution quality with:

• Individually coordinated instructions
• Compliance with the requirements of the execution standard DIN EN 14 679
• A manufacturing record prepared for each pair of columns
• Clear processes governed by our quality management system in accordance with DIN EN 9001:2015

Soil mixing is available in the following design variants:

• Soil mixing wall as a cut-off wall
• Soil mixing wall with load-bearing elements as a temporary construction pit system
• Individual soil mixing columns for subsoil improvement