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Contractors World 2011 Volume 2 Issue 5
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ALLU Stabilisation System for mass stabilization is an alternative to traditional soil strengthening methods and useful in basement projects or when it is wanted to avoid the need for more expensive muck-shifting and piling techniques.

An alternative to traditional soil stabilisation

     Soil stabilization methods have changed little over recent years, however, a new solution
     that is now available is worthy of investigating for certain application.

ALLU Stabilisation System for mass stabilization is an alternative to traditional soil strengthening methods and useful in basement projects or when it is wanted to avoid the need for more expensive muck-shifting and piling techniques.

The Finland-based company, ALLU is a company probably better known for its excavator mounted screener-crusher buckets, has developed a novel mass stabilisation system in conjunction with Ramboll Finland, a well established Nordic consulting concern.

The system provides a fast, cost-effective and environmentally friendly work method for the hardening and dynamic strengthening of soft soils, as well as improving the soil’s deformation properties. It is designed to improve soft soils by mixing a binder into clay, peat, mud or dredged sediments.

The method can also be used in the treatment of contaminated soils, by encapsulating contaminants within the ground and preventing migration to the surrounding areas.

A power mix attachment mounted to the dipper arm of a suitable excavator, using a pin mounting or quick-hitch adaptor plateThe Allu system comprises:

  • A power mix attachment mounted to the dipper arm of a suitable excavator, using a pin mounting or quick-hitch adaptor plate. At the end of this substantial attachment, a pair of mixing/cutting drums are used to mix the binder material into the ground in a controlled manner. 
       The unit can process different materials to a depth of 7 m, depending on the choice of the power mix model, the excavator’s reach and the quality of the material.
  • A pressure feeder mounted on a powered crawler chassis or on a trailer injects the binder into the ground by compressed air via hoses.A pressure feeder mounted on a powered crawler chassis or on a trailer injects the binder into the ground by compressed air via hoses. The amount of binder per cubic metre can be controlled, depending on the requirement for the prevailing ground conditions.
         There is a choice of a 7 m³ tank or twin-mounted tanks providing 14 m³. On a trailer mounted pressure feeder the twin-mounted tanks provide 20 m³.
  • A data acquisition control system (DAC), located in the excavator’s cabin. This controls, measures and stores data on the stabilisation project.

    On site, the flow and pressure of the binder are adjusted by the excavator operator via the DAC, and it is easy to use and enables the binder to be fed at optimum rates. Back in the office, the DAC provides an extensive report for the entire duration of a project, the data being transferred into a computer via a USB port.

The system has already been used successfully to stabilise clay and peat deposits in Northern and Southern Ireland, in unstable material in Valencia harbour, Spain, as well as in Portugal and other countries around Europe. One of the largest projects undertaken by the system was the mass stabilization of approximately 500,000 m³ of dredged sediments contaminated by Tributyl Tin in Vuosaari Harbour, Finland.

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