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Author(s):	Achmus, Martin; Weidlich, Ingo
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Abstract:	Fernwärmeleitungen werden durch erhebliche Temperaturwechsel beansprucht und interagieren deshalb bei der üblichen Erdverlegung intensiv mit dem umgebenden Boden, der die temperaturinduzierte Verformung behindert. Die axiale Verformung der Leitung mobilisiert Reibungskräfte und die laterale Verformung z. B. in Bogenbereichen Bettungswiderstände. Beide Bodenwiderstände verändern sich mit der Betriebsdauer der Leitung infolge ihrer Zyklenabhängigkeit. Die mobilisierbare Reibungskraft ist überdies von der Betriebstemperatur der Leitung abhängig, sodass sich ein sehr komplexes Tragverhalten ergibt, das in der derzeitigen Bemessungspraxis nur stark vereinfacht erfasst wird. Der vorliegende Fachaufsatz stellt den Kenntnisstand bezüglich der Reibungskräfte und Bettungswiderstände zusammengefasst dar und beschreibt den in einem laufenden Forschungsprojekt verfolgten Ansatz zur genaueren Erfassung des Tragverhaltens erdverlegter Fernwärmeleitungen. Interaction of district heating pipelines and the surrounding soil District heating pipelines are subjected to significant temperature changes and therefore interact intensively with the surrounding soil, which hinders the temperature-induced deformation of the pipeline. The axial deflection mobilizes friction forces and the lateral deflection occurring for instance in arc sections mobilizes bedding resistances. Both soil resistances change with operation period of the pipelines due to cyclic load effects. Moreover, the maximum friction force depends on the operation temperature of the pipeline. The bearing behavior of the pipeline is thus quite complex. In the current design guidelines the complex behavior is considered only in a very simplified way. The report at hand summarizes the knowledge concerning friction forces and bedding resistances and describes an approach followed in a current research project to consider the bearing behavior of earth-buried district heating pipelines more accurately.
Source:	Bautechnik 93 (2016), No. 9
Page/s:	663-671
Language of Publication:	German

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