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Muhlenkamp M.,Ingenieurburo Heitfeld Schetelig GmbH IHS | Heitfeld M.,Ingenieurburo Heitfeld Schetelig GmbH IHS | Klunker J.,Ingenieurburo Heitfeld Schetelig GmbH IHS | Korndorfer C.,Wayss and Freytag Ingenieurbau AG | Schetelig K.,Ingenieurburo Heitfeld Schetelig GmbH IHS
Geotechnik | Year: 2010

For the purpose of groundwater control during construction of the Finnetunnel 176 wells were installed along a stretch of 4.5 km length. Two separate cones of depression were established during the operation of groundwater control measures as both tunnels were driven by tunnel boring machines advancing in different stages. Groundwater was pumped through collection pipes to a central water treatment plant, and was then either reinfiltrated into the bedrock or discharged into the receiving water course. Drawdown characteristics of the extraction wells during the desanding process and results of a trial run were documented and evaluated in detail; on this basis, extraction wells were categorized and the groundwater control section was divided into six homogeneous areas of distinctly different hydrogeological and hydraulic characteristics. As a result, operation of the extraction wells and subsequently the extent of the depression cones could be adjusted according to the advancement of the tunnel. Pump operation times and groundwater extraction volumes were considerably reduced, thereby significantly contributing to the protection of groundwater resources as part of the tunnel is located within a groundwater protection zone.

Rieker K.,Wayss and Freytag Ingenieurbau AG
Proceedings - Rapid Excavation and Tunneling Conference | Year: 2015

Since the mid-19th century the River Emscher in the German Ruhr District has been used for disposing of wastewater. In the early 1990s, it was decided to replace the existing open wastewater system with a sewer system and to restore the River Emscher to its natural state. The major Emscher conversion project is divided into a large number of individual schemes, with construction phase 30 being the largest. By applying the pipe jacking method, interlinking tunnels with section lengths in excess of 1,100 m are constructed.

Finckh W.,Wayss and Freytag Ingenieurbau AG | Ignatiadis A.,Deutscher Ausschuss fur Stahlbeton E.V. | Niedermeier R.,TU Munich | Wiens U.,Deutscher Ausschuss fur Stahlbeton E.V. | Zilch K.,TU Munich
Beton- und Stahlbetonbau | Year: 2012

The strengthening of concrete structures with adhesive bonded reinforcement has in Germany only been governed so far through national technical approvals and approvals in individual cases. Since the strengthening of reinforced concrete structures with adhesive bonded reinforcement has become a standard construction method and due to the starting of a harmonization process in European standardisation committees a new guideline in this area of interest was created. For that purpose all groups, which are concerned about this topic were assembled in a committee under the responsibility of the German Committee for Structural Concrete and created the DAfStbguideline "strengthening of concrete structures with adhesive bonded reinforcement" [1]. The guideline will be published in September or October 2012.Copyright © 2012 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Luhr S.,Wasser und Schifffahrtsamt Lauenburg | Morgen K.,WTM Engineers GmbH | Wieser M.,Wayss and Freytag Ingenieurbau AG
Beton- und Stahlbetonbau | Year: 2015

The new road bridge Horsterdamm in the city of Lauenburg crosses the Elbe-Lübeck-Canal and a railway line. The old bridge, a riveted truss bridge, built in 1939, showed severe defects and had to be replaced. The new bridge is designed as an arched bridge with a composite concrete slab. A bunch of pipes and wires under the bridge lead to the decision to employ precast elements with a cast in place topping. The paper deals with some special design aspects and experiences during erection. Special attention is given to the advantages of the precast elements with respect to crack development due to hydration heat and constraint. © Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG.

Rieker K.,Wayss and Freytag Ingenieurbau AG
Proceedings - Rapid Excavation and Tunneling Conference | Year: 2013

Wayss & Freytag Ingenieurbau AG is currently constructing three major infrastructure projects in Belgium. The paper will highlight some of the construction challenges of the projects and the sometimes quite unique construction methods developed and successfully implemented on those projects. Some of the challenges were: tunneling under the live runways of Brussels International Airport; construction of a railway tunnel underneath an existing road tunnel in the heart of Brussels utilizing hand-dug diaphragm walls and pipe-jacking and finally slurry TBM tunneling under the harbor of Antwerp with minimal cover.

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