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Author(s):	Lochas, G.; Forner, A.; Mathes, D.; Stengler, M.; Beuche, N.
Title:	Deutsche Nationalbibliothek 4. Erweiterungsbau in Leipzig - Besonderheiten bei der Unterfangung und der Bestandssicherung
Abstract:	Derzeit entsteht der 4. Erweiterungsbau der Deutschen Nationalbibliothek in Leipzig. Der neue Baukörper grenzt bereichsweise an die Bestandsgebäude und wurde 6 bis 8 m unterhalb der bestehenden Fundamente gegründet. Der setzungsempfindliche Baugrund infolge eines 4 m mächtigen Kohleflözes musste in der Planung besonders berücksichtigt werden. Um die Bestandsgebäude gegen Setzungen, Rissbildungen und Schiefstellungen zu schützen, wurden außergewöhnliche Sicherungsmaßnahmen realisiert: -·Zusammenspannen der Gebäude mittels Anordnung von Zugstäben -·Auskreuzung gefährdeter Bereiche durch Holz-Fachwerkverbände -·Anwendung einer besonderen Technologie der HDI-Unterfangung. Mit diesen Maßnahmen konnten ungleichmäßige Setzungen und Rissbildungen weitestgehend vermieden werden. The German National Library in Leipzig - 4th extension - Special features of the underpinning and safety measures of inventory. At present the 4th extension of the German National Library in Leipzig is under construction. The new building is near the existing buildings and was founded in 6 to 8 m below the existing foundations. The ground is liable to subsidence due to a 4 m thick coal seam. This had to be specially considered in the planning. To protect the existing buildings against settlements, cracking and misalignment extraordinary safety measures were implemented: -·tensioning arrangement of buildings by means of tension bars -·strengthening of vulnerable areas by timber trussed bond -·using a special technology of grouted underpinning With these measures, non-uniform settlements and cracks could be largely avoided.
Source:	Bautechnik 86 (2009), No. 11
Page/s:	704-709
Language of Publication:	German

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