Hybrid Incorporation
Wind Turbine
Hybrid Foundation “TERRA-MIX System”
Execution: March–May 2011
Project: 4 wind turbines in Tortumanu (Romania) 4–6 layers of “binder-reinforced” structure
General Contractor: STRABAG s.r.l.
Area per turbine: approx. 500 m² (including overhang) Area stabilized with binder (1 layer for access roads and crane pads): approx. 16,300 m²
Project Description:
During the ground investigation, it was determined that macroporous loess extends to a depth of approximately 15 meters below the top of the terrain. The consistency ranged from stiff to semi-solid, and the moisture content increased with depth.
Solution:
To ensure sufficient load-bearing capacity, the following procedure was followed: During the foundation work for the wind turbines, IMPULSE COMPACTION was first performed using a grid pattern of 3.0 m x 3.0 m, which required up to three transitions. The gap was compacted in a single pass using so-called “finish points.” The build-up to the foundation was carried out in binder-reinforced layers of 50 cm, using the existing loess as the base material. For three turbines, the build-up was 2.0 m; for one turbine, six layers—that is, 3.0 m—were required. The composition of the binder (lime-cement mixture) was determined in advance based on numerous suitability tests and was monitored and adjusted throughout the construction process. For the access roads and crane pads, the binder-stabilized subgrade was constructed in a single layer, and crushed angular aggregate was used as the wearing course.
Result:
Both the bearing capacity test using a load plate and the test of the soil density/consistency using a cone penetrometer yielded results that met or significantly exceeded the calculated values. Consequently, the settlement remained well below the limit values determined in the settlement analysis.
Система Hybrid Incorporation
Two innovative methods, one optimal solution for your building project
With the HYBRID FOUNDATION system TERRA-MIX the merits of the IMPULSE COMPACTION system TERRA-MIX meets up with the innovative method of the Replacement Carrying Layer System TERRA-MIX. The result is a foward-looking method which helps you minimise building ressources, to significantly reduce building time and the costs.
HYBRID FOUNDATION system TERRA-MIX– the foundation system of the future
