| Popis: |
Whereas it is necessary to continue construction of a pedestrian bridge, for which the foundations and pylons made of the used pipes were built, the engineers were confronted with a problem of suitability evaluation of these pylons for further use with due account for their service state and the intended bridgework gravity loads as well as other design loads. This article presents the results of the visual and instrumental inspection of the current state of suspension pedestrian bridge pylon legs. Analysis of the inspection results showed that the wall thickness of the used pipes of pylon legs meet the design values; thickness of the paint coating is less than the design values and so the coating does not provide anticorrosion protection of legs; steel grade of the used pipes corresponds to the design one; according to the hardness measurement data the metal mechanical characteristics are not lower than the regulatory values. To ensure long-lasting operation of pylon legs, the authors recommend to suppress the top legs, closing the access of water inside them, and perform the high-quality anticorrosion protection of steel structures. Further, the article considers the problem of plotting pedestrian bridge design diagrams, including the intended loads, for the analysis of stress-strain state of the pylon legs made of used pipes, which will be considered in the second part of this work. |
