Gewählte Master / Diploma Thesis:

Christoph Noebauer (2007): Untersuchung neuer Methoden der Scheiteldruckprüfung an Abwasserrohren.
Master / Diploma Thesis, BOKU-Universität für Bodenkultur, pp 130. UB BOKU obvsg

Data Source: ZID Abstracts

Abstract:

The present thesis focuses on the testing of the crown compressive strength on sewage pipes made of vitrified clay and concrete. In this context, two test runs were conducted and analyzed by comparing the results of the two test runs. The first test run deals with crown compression tests with stiff bearing, the second one deals with crown compression tests with pipes in imbedded condition. Special attention was paid to the test of pipes renovated with close-fit-liners. Especially in this case, the conventional methods of crown compression tests prove to be insufficient because the effect of the liner, which is not deployed until the burst of the pipe, cannot be examined. Therefore, the static behavior of the total system ground-pipe-liner cannot be examined. In both test runs deformations were determined in addition to the crown compressive force. They compromised the total vertical deformation, i.e. the vertical deformation of the specimen including the deformation of the bearing- and/or compression beam and its bearing areas, determined with a displacement transducer, and the outer fibre strains in the cross-bars, surveyed with strain gauges. In the tests with stiff bearing, the vertical deformation was measured additionally by means of a videoextensometer. Due to the continuous monitoring of the measured variables the results could be plotted in the form of force-deformation-lines and analyzed. Thereby a substantially stiffer behavior of the pipes appeared in the imbedded condition. As expected, a re-increase of the crown compressive force, which is attributed to the vault development as a result of the activation of the earth pressure, could be observed after the burst of the pipe. The crown compression test in sand bed with additional deformation measurement finally proved to be a useful testing method, which enables, at least for the range of lower nominal widths, a test under practical conditions also in cramped space conditions in the laboratory.

Beurteilende(r): Wu Wei

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