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  • HYBRID FOUNDATION »System TERRA-MIX«

    Building Project: Residential neighbourhood Seefeldergasse 30, A-1220 Wien Awarding Authority: BWS Gemeinnützige allg. Bau-, Wohn- und Siedlungsgenossenschaft Reg.Gen.mbH Area: 3.000m2

    Assignment: For the construction of a residential neighbourhood without basements the ground should be improved. Between the top soil and the medium densely bedded gravel there is a loosely bedded intermediate layer of silty fine sand to sandy silt to a depth of 2.6m. In order to prevent grain redistribution due to fluctuating groundwater level with its to be expected settling, an excavation and backfill of lean concrete to a depth of 2.8m was foreseen. An alternative was being looked for so as to shorten the construction time and to optimize the construction progress. Solution: The „Hybrid-foundation System TERRA-MIX“ was selected. 1.Step: Improving the silty fine sand and the same time respectively creating the work level with a layer strength of 45cm by means of milling a suitably with the ground harmonized binding agent into the ground. Evd>35MN/m2. 2.Step: Impulse Compaction in several work steps and re-filling of the settling cones with binding agent improved soil. 3.Step: Creating a frost-proof „Substitute base layer System TERRA-MIX“ with a layer strength of 45cm by means of milling a suitably with the ground harmonized binding agent into the ground. This substitute layer serves as a load compensating layer above the compaction columns. Evd>70MN/m2 Result: By using the Hybrid-foundation "System TERRA-MIX" the use of resources could be minimized , the construction time be shortened and a foundation version of very high quality could be established.

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