As infrastructure contractors around the world face increasing pressure to shorten track possession periods and reduce track renewal costs, several railways have adopted the use of preassembled components. This allows track panels to be installed rapidly, after having been produced as ready-made modules at a factory and transported to the work site. Rail.One and DB Netz have installed a prototype hinged segmented turnout bearer in a freight yard in Oberhausen, unlike other modular turnouts, the compact design can be transported on standard flat wagons for rapid installation on site. The initial study assessing how to install a flexurally-rigid hinged joint in a concrete sleeper showed that static and dynamic integrity specifications for conventional prestressed concrete sections may not be sufficient, since the hinge assembly adds a further structural element. Working with EBA, Rail.One adapted the design to withstand the loads typically applied to a steel engineering structure. This left the engineers with two main challenges: how to ensure that the steel hinge joint could provide the required resistance to fatigue, and how the steel unit could be fixed to the prestressed concrete bearer while retaining a very high degree of structural strength. To test the resilience of the hinged design, Rail.One approached the Technical University of München to undertake a series of repeated load tests in its laboratory These tests were intended to exceed by a considerable margin German and European standards for assessing the fatigue strength of concrete sleepers. Using typical loads calculated by EBA, the hinged bearer was subjected to 5 million cycles, compared to 2 million cycles for standard concrete sleeper testing.


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    Titel :

    Hinged bearers enable compact transport


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2012


    Format / Umfang :

    3 Seiten, 5 Bilder, 2 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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