Immediate Measure Ehrenhausen: DYWI® Drill System permits fast and flexible Slope Stabilization

In Ehrenhausen in southeastern Austria, south of Graz, an embankment was recently destabilized by heavy rainfalls. A landslide occurred near the train station along the railway tracks of the Suedbahn, affecting an approximately 200m long section of the embankment.

Parts of the failed embankment buried the tracks so that approximately 5,900m³ of the slope had to be removed. Afterwards, the unstable slope was stabilized by installing soil nails up to a depth of 12m and by installing high strength steel mesh to contain the slope material.

The Suedbahn railway track that had been closed due to the landslide had to be reopened for railway traffic as soon as possible, so the slope had to be stabilized within a very tight schedule.

In total, approximately 6,850m² of embankment had to be stabilized, and 517m long rockfall protection fences had to be built. In the soaked unstable slope, stabilization using DYWI® Drill Soil Nails could only be carried out manually and using a walking crane.

The DYWI® Drill Soil Nails ensured an efficient use both for mechanized installation using the walking crane and for manual installation.

Thanks to the flexible coupler system and the comprehensive range of drill bits, the soil nails could be directly adapted to the prevailing geological conditions.

The stabilization of the embankment required 1,170 R32-320kN DYWI® Drill Soil Nails with a total length of 7,400m, 50 R38-550kN DYWI® Drill Soil Nails with a total length of 370m and 130 R51-660kN DYWI® Drill Soil Nails with a total length of 900m.

For the foundation of the rockfall protection structures, 185, 43.5mm Ø GEWI®Plus Bar Anchors with a total length of 400m were used according to the system description provided by the manufacturer. All of the systems were supplied complete with accessories.

Owner

ÖBB Infrastruktur AG, Austria

General Contractor

Swietelsky Bauges.m.b.H., Austria

Consulting Engineers

IBK Ingenieurbüro Kronawetter ZT Gesellschaft mbH, BGG Consult Dr. Peter Waibel ZT GmbH and PULSE Engineering GmbH, all of them Austria

DSI Unit

DYWIDAG-Systems International GmbH, Austria


DSI Scope

Production, supply

DYWIDAG Products

1,170 R32-320kN DYWI® Drill Soil Nails, 50 R38-550kN DYWI® Drill Soil Nails, 130 R51-660kN DYWI® Drill Soil Nails, 185, 43.5mm Ø GEWI®Plus Bar Anchors

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DYWIDAG-SYSTEMS INTERNATIONAL Sp. z o.o.

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