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Due to their high bearing capacity, their economic efficiency and their flexible operation conditions driven open ended piles are a commonly used foundation type. Notwithstanding a wide experience regarding this type of pile, the bearing behavior is not explicitly known. During the construction of the bridges "Niedernfelder Brücken" in the port of Hamburg extensive dynamic pile load tests were carried out at open ended piles with and without reinforcement. The resulting data and experiences gained in this project will be summarized in this paper. © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

Richter S.,Bilfinger Berger Ingenieurbau GmbH | Cudmani R.O.,Smoltczyk and Partner GmbH | Slominski C.,Bilfinger Berger Ingenieurbau GmbH

For the design of the Golden Ears approach bridge in Vancouver (Canada), a spread footing over a pile-reinforced ground with gravel interface was considered as an alternative to a conventional pile foundation. The mechanisms governing the behavior of the spread footing during strong earthquake events have been investigated in a numerical Finite-Element (FE) analysis using a (visco-) hypoplastic constitutive relationship. The FE model includes the soil, the piles, the footing and the gravel layer. The superstructure and the pier are represented by a point mass attached to the end of a vertical beam. Material parameters for the soil models were derived from available field and laboratory tests. The numerical model was validated using results from a large-scale in-situ test with a footing above a single pile. The goal of the numerical study was the investigation of the influence of pile spacing and gravel layer thickness on the dynamic response of the footing, the superstructure and internal pile forces during a strong earthquake. A significant kinematic decoupling between footing and improved soft soil through the gravel layer did not occur in the simulations. Analysis results show that the internal forces in the reinforcement piles are considerably smaller compared with those in a conventional pile foundation, particularly in the upper part of the pile. The pile spacing was found to have a minor influence on the internal pile forces. In the range investigated, a dependence between the bending moments and shear forces in the piles and the thickness of the gravel layer was not observed. Copyright © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

Andersson H.,Trafikverket | Amiand S.,Bilfinger Berger Ingenieurbau GmbH | Adolph F.,Bilfinger Berger Ingenieurbau GmbH | Bennighof R.,Bilfinger Berger Ingenieurbau GmbH

The project "Norra Lanken" in Stockholm is " one of the largest road construction projects in Sweden, Since July 2007 the project Norra Länken NL12 Betong-tunnel Norrtull is under execution. In January 2010 the execution of the project NL22 Bellevue was started. At the end of 2010 the Client Trafikverket ordered extra work NS18 Tidiga Tunnlar with start of execution in January 2011. All three contracts are cut and cover road tunnels. Bilfinger Berger Ingenieurbau GmbH is leading the three projects and is responsible for executing the construction pits as well as the concrete works for the tunnel and a permanent railway bridge. Source

Zehetmaier G.,Bilfinger Berger Ingenieurbau GmbH | Holfelder M.,Bilfinger Berger Ingenieurbau GmbH

The paper presents key aspects in the bridge design for Norway's largest on-shore infrastructure project, the new motorway E18 between Grimstad and Kristiansand. The DBFO project realized between 2006 and 2009 includes 61 bridges. They have to meet highest demands regarding robustness, durability and low maintenance in rough environmental conditions. To achieve this, bridges were primarily designed as semi-integral structures thus minimizing the number of bearings and joints. The paper describes the design development and highlights design basis and design approach for bridge structures. The basic principles are explained on the basis of built examples. Source

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