Büsum Town Council EMBANKMENT SLOPE/STREET RESTRUCTURING – 2004
Fillings in foundations and behind retaining walls
The new construction and alterations to the front square brought additional loads to bear on the surrounding soil as a result of filling and additional layers. In order to reduce soil pressure and minimise settling, 8-16 mmsize GEOTON was used. The job owner, Büsum town council, in consultation with the Bornholdt engineering bureau from Albersdorf, selected expanded clay (GEOTON 8-16 mm) as light aggregate for the embankment structure and foundation fill. The construction project is situated immediately next to a protective embankment. New construction work is taking place alongside extension and reconstruction work using pillars on the existing wave pool. The foundation and embankment fill must attain a total height of between 2m and around 5m. As the new work is to be incorporated into the protective embankment, in consultation with the ALR (Amt für Ländliche Raum, Hüsum), special measures are to be taken to ensure the stability of the GEOTON light aggregate. This has given rise to a new construction method, allowing GEOTON light aggregate to be applied in costal defence zones. The terrain is made up of coastal marsh layers (shale, peat), which are subject to settling. Following tree challenges had to be taken into account, in the very odd soil conditions and landscape: dimensional stability; filtration stability; slope stability. To ensure all the above dimensional characteristics, loose LWA was chosen in combination with geotextile and a cement binder. Due to the low specific weight of the expanded clay fill (1/3 of the specific weight of a conventional fill), any settling of the subsoil in response to the load is minimised and the soil pressure on the lateral walls is reduced. Filtration stability between the conventional fill material (sand, sand/gravel layers or sand/gravel mix) and the 8-16 mm-size expanded clay fill was achieved by using a geotextile. The surface of the expanded clay fill was, in some areas, sprayed with cement slurry, to strengthen the surface. The slurry was delivered at site in silos and pumped into the different working area to speed up the application.
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GERMANY TECHNICAL DATE OF THE PROJECT Designer: Ing.-Büro Bornhold, Albersdorf Ing.-Büro Lehners + Wittorf, Lübeck. Contractor: Kähler Bau GmbH, Büsum. Place of job: Büsum Town Council Street restructuring - Germany. Date of application: 2004. Quantity of Leca®: 1.000 m3. Type of material: 8-16mm. Others Geotextile: 1500 m2 Geolon PP 40L GEOTON - Binder: 7 Ton cement slurry.
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www.maxit-group.com maxitGroup AB, Box 415, SE-191 24 Sollentuna, Sweden Tel.: +46 (0)8 858 70 64 00, E-mail: info@maxit-group.com
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