Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG Prestressed Concrete Sleepers: Sustaining Railway Traffic Leonhard Moll Betonwerke Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG Railway History set up the initial needs • Gauge 1.435 mm • load transmission 22,5 to. Historical construction materials wood steel Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG vertical loads resulting from train weight lateral loads resulting from sinusodial run Requirements for sleepers: • compressive strength • form stability • bending tensile strength wood: steel: concrete: ok ok ? Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG Concrete has the initial quality of compressive strength to hinder product failure through poor tensile strength Joseph Monier invented armed concrete in 1867 span concrete, starting in the late 1920-ies, improved concrete as construction material for dynamic loads Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG The prestressed concrete sleeper established in the early 1950-ies Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG Span systems for concrete sleepers mostly are prescribed by their production process Longline Carrousel pretensioned post tensioned instant demolding late demolding or Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG EN 13.230 (1-5) for concrete sleepers were established between 1995 and 2003 at this time all production systems have been already working according national norms therefore it could be nothing else than the least common denominator and it even delegates the most relevant definition of the nominal or testing loads to the buyer EN 13.230 deals with other norms, dimensions, curing, impact coefficients and product testing, a part 6 dealing with construction principles may follow some day Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG Thosti (Thormann & Stiefel) Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG DSA (Dyckerhoff Span Anchor) Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG Longline Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG Wayss & Freytag Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG What can help, finding a long lasting concrete sleeper for your railtrack? • end anchors secure the initial prestressing force in the sleeper for a long product life • supplier history is important – particularly if the buyer is caught in a short term warranty period • seek after experience in technical or operational divisions of other countries with notable history Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG Leonhard Moll Betonwerke reliable since 1929 Thank you for your attention Leonhard Moll Betonwerke GmbH & Co KG Lindwurmstr. 129a, D-80337 Munich [email protected]
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