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Contractors World 2011 Volume 2 Issue 5
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An alternative to traditional soil stabilisation > > > continued > > >

 

Stabilising the foundations for industrial area in Finland

The Kivikko industrial area in Finland has been expanded again. The area owned by the City of Helsinki has expanded gradually over the years and the new stabilised area is now about 3,5 hectares. And ALLU was used to stabilise this area for the first time in 2001.

The latest job started in Helsinki in the beginning of June 2010 and the stabilisation work was finished by mid December 2010. The lead contractor Biomaa Ltd from Nurmijärvi, Finland has many years of stabilisation experience. The sub-contractor at this job site is Skanska Infra Ltd.

Ramboll Finland has been involved in Kivikko-project from the early stage. Lately Ramboll has been carrying out binder optimization as well as quality control for the project.

“The combination of column stabilisation and mass stabilisation was the only way this area could be developed, as the soft clay can reach down to 18 m on this area”, explains the development manager Mr. Ville Niutanen from Biomaa who was also in charge of this project.

   The material being treated was soft peat and clay which in some areas was very wet indeed. The top layer down to 3 m was peat and after that starts the soft layer of clay. The clay layer can be from 3 to 18 m deep until the solid rock or moraine starts. The material being treated was soft peat and clay which in some areas was very wet indeed. The top layer down to 3 m was peat and after that starts the soft layer of clay. The clay layer can be from 3 to 18 m deep until the solid rock or moraine starts.

The layer of clay was column stabilised and the peat layer was treated with mass stabilisation after the column stabilisation was done. “The mass stabilisation done on top of column stabilisation ensures a surface that does not sink”, Mr. Niutanen describes.

The job started by removing the stumps and roots. After this, a layer of fine sand was spread on top of the surface (approx. 150 kg/m³) to improve the quality of the peat so that it stabilises better. On top of the fine sand, a layer of crushed stone was placed to ensure that the column stabilisation machine could move over the location. The column stabilisation was carried out first through the clay layer to the rock or solid bottom. The columns end at the base of the peat layer, about 3 m deep.

When the column stabilisation was completed the crushed stone layer was removed and the premixing of the peat layer was started. In premixing the fine sand was mixed together with the peat and afterwards the peat was stabilised by feeding and mixing the binding agent evenly to the material. The already stabilised layer was then covered with geotextile and about 100 cm layer of crushed stone was placed on top as a preload embankment.

The Finnish industrial estate stabilization and groundworks completed and industrial complexes being erected   The binding agent used at this job site was cement. In column stabilisation, the volume of the binding agent was about 26 kg/metre (about 130 kg/m³) and in mass stabilisation about 100 kg/ m³. Depending on circumstances in one day 800 – 1000 m³ was mass stabilised with one Allu unit.

At this job site, the new Allu PFM 10+10 pressure feeder was in use which can feed the binder as far as 200 m from the trailer. Part of the time, two Allu PF 7 pressure feeders worked at the site adding to the capacity. “It was easy to bring the unit to the job site and it saved a lot of time and money, because we did not have to build a road for it at the area where we needed to stabilise”, Mr. Niutanen states pleased.

The Finnish industrial estate stabilization and groundworks completed and industrial complexes being erected

Logistically the Kivikko area is ideal for an industrial area and that is perhaps why it has grown steadily over the years. The City of Helsinki sells the lots and the buyer will take care of the building- and other landscaping works.

Proven concept

There is no doubt that the system has been proven to work to the satisfaction of major contractors, now it is up to the company to promote the concept more fully around the world and help in the establishing of an alternative to the tradition forms of soil stabilisation

Allu

 

 

 

 

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