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Berlin, Germany

Kirsch F.,GuD CONSULT GmbH | Klingmuller O.,GSP mbH
Geotechnical Special Publication | Year: 2012

While it is common practice to monitor pile installation for offshore platforms in the hydrocarbon industry, the installation of foundation structures for offshore wind turbines is a new challenge. Wind Turbines to be installed in the German sector of the North Sea are mostly built on pile foundations. Both monopile as well as multiple pile - mainly three pile (tripile) - solutions are designed. As these piles have to resist high lateral loading, they must be embedded in strong competent soil layers. Open-end steel piles of large diameters are generally used and installed by impact driving. In general, hard driving conditions exist. It will be shown that the monitoring of the driving process by the Pile Driving Analyzer is not only important for the assessment of hammer performance and stresses in the pile or axial soil resistance, but also for lateral resistance. The assessment of the cyclic stability of the foundation requires an accurate prediction of the static capacity, which can be realised by dynamic pile tests. A proposal is given for the derivation of approximate p-y-curves for lateral loading directly from the solutions of CAPWAP model parameters. © 2012 American Society of Civil Engineers.

Various calculation methods were applied on the piled raft foundation of the high rise building "Skyper". The results are compared and discussed. Numerical methods as well as simplified methods based on the elas - tic half space theory lead in the actual case to reasonable results. With the derived subgrade reaction modulus and pile stiffness the raft reinforcement was computed. A recommendation for the application of numerical and simplified methods is given. © Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG.

GuD CONSULT GmbH | Date: 2012-07-06

A device and a method for surveying jet grouting piles in a subsoil, which is suitable for a drilling and grouting linkage assembly for creating a hole and a jet grouting pile in a region of the hole. A measurement device is integrated in the drilling and grouting linkage assembly and comprises a scanning element that is movable from a retracted position to an extended position. The scanning element is deflected inside the measurement device through a retraction and extension housing mounted on the measurement device. The scanning element comprises at least in segments a shape-memory alloy.

GuD CONSULT GmbH | Date: 2012-08-09

The present invention concerns a device for proving the quality of a jet grouting body. Such a jet grouting body is produced by means of a drilling and grouting linkage assembly. An extraction device according to the invention for extracting a suspension from such a jet grouting body comprises: a first segment with a cavity comprising a fluid, in particular a liquid, in which a first chamber is provided, the volume of which can be modified and which is connected with an opening for extracting a specimen, and a further segment which is intended to receive the fluid from the cavity. By receiving the fluid in the further segment, the volume of the first chamber can be enlarged; furthermore the extraction device can be integrated in a drilling and grouting linkage assembly.

Vrettos C.,University of Kaiserslautern | Borchert K.-M.,GuD CONSULT GmbH
Soils and Foundations | Year: 2011

The building complex of the Beisheim Center at the Potsdamer Platz in Berlin has recently been completed. Different building parts had to be founded partially on the existing tunnel structures and partially on a system of piled-raft and raft foundations. The combined foundation was designed so as to minimize sectional forces due to the different foundation stiffnesses that were the unknowns in the analysis. Based on pile load tests the nonlinear stiffness of piles has been determined. For the design, both foundation components have been first decoupled and analysed separately. Subsequently, the interaction effects have been estimated by a simplified procedure. The pile configuration has been optimized by considering its effects on the superstructure. The performance of the combined foundations has been checked by comparing computed deformations with actual measurements at relevant points. Parallel to this, the system has been analysed by a 3D finite element model. The concept and the key design items of the combined foundation are presented, and a comparison is made between the estimated deformations and the measurements. The methodology for the analysis of building response to train induced vibrations is outlined.

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