GEWI® Soil Nails ensure long-term Security: Widening of the B14 Federal Road southwest of Stuttgart

On behalf of the regional board in Karlsruhe, Germany, the B14 Federal Road between Horb-Neckarhausen and Sulz-Fischingen southwest of Stuttgart was widened. The expansion measures were carried out in two phases.

The first phase included the construction of an approximately 670m long and up to 4.65m high shotcrete wall designed to stabilize a slope located next to a curve in the road. In the second phase, the construction of this retaining wall provided for the complete widening of the B14 in the curved section. Thanks to the 800m long widening project, safety in this section of the road will be considerably improved. In the first construction phase, the B14 Federal Road was completely rebuilt and shifted into the slope by approximately 2m. In total, this section required the excavation of roughly 10,000m³ of soil. The slope in this area was permanently stabilized by the new shotcrete wall.

In order to stabilize the embankment for the long term, approximately 1,000 GEWI® Soil Nails were anchored into the load-bearing strata of the slope in up to 3 levels up to a height of 5m. In total, DSI Germany supplied about 6,500m of 25mm Ø GEWI® Soil Nails with standard corrosion protection in individual lengths of 6.5m.

Afterwards, a 30cm thick layer of shotcrete was applied to the retaining wall over a surface area of roughly 1,800m². Subsequently, a 5cm thick facing was applied in a faux masonry pattern.


Regional board Karlsruhe, Germany


PST Spezialtiefbau Süd GmbH, Germany


Rainer Verst Dipl.-Ing. Geotechnik & Spezialtiefbau GmbH, Germany

DSI Unit

DYWIDAG-Systems International GmbH, BU Geotechnics, Germany

DSI Scope

Production, supply

DYWIDAG Products

Approximately 1,000 25mm Ø, 6.5m long GEWI® Soil Nails

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