Cheers to Temporary Reinforced-Earth Construction

Cheers to Temporary Reinforced-Earth Construction

Freyburg, Germany | NAUE GmbH & Co. KG

The foundation stone for a new administrative building with a cafeteria for the champagne producer Rotkäppchen situated in Freyburg (Germany) was laid in 2011. The modern concrete and glass building will be 30 x 10m and will be erected directly behind the courtyard of the wine cellar.

The space there is very limited and the neighbouring mountain slopes had to be secured in a permanent manner. Concrete pillars of up to 15m in length and a diameter of 1.2m were needed. The operating and working weight of the drilling rig required for pillars of this size is almost 100 tonnes and requires a stable base.

A temporary, approximately 7m high MSE-construction was the solution. Constructing this steep wall required the utilisation of NAUE STEEL T’s factory-folded Q 257A structural steel lattice mats for permanent formwork. Behind them, a Secutex® nonwoven geotextile was installed to protect against water infiltration. The Secugrid® 120/40 R6 geogrids, which provide the primary reinforcement strength of the STEEL T system, were installed from the inside and folded at the steel grids. The Secugrid® was anchored into the ground 6m deep with a 0.5m spacing between layers.

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This solution created a strong, stable temporary drilling and driving base for the drilling rig (BG 28). There were no problems during the drilling and the pouring of the concrete. The drilling holes remained stable, despite the heavy weight of the drilling rig. Of note this construction approach did not require any undue additional amounts of concrete; there was no deformation to the MSE front; the construction team reported no difficulties in the drilling process; and there was no deformation detected in the construction.

After the concrete was poured, the MSE wall was dismantled completely. The exposed concrete columns took on the support function. The NAUE STEEL T reinforcement system needed to be in place for only 8 weeks, which provided an enormous time advantage and was by far a very economical solution compared to other proposals.