Prestressed Concrete Sleepers : Sustaining Railway Traffic Leonhard Moll Betonwerke
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Leonhard Moll Betonwerke Ein Unternehmen der Leonhard Moll AG Prestressed Concrete Sleepers: Sustaining Railway Traffic Leonhard Moll Betonwerke
description
Prestressed Concrete Sleepers : Sustaining Railway Traffic Leonhard Moll Betonwerke. Gauge 1.435 mm load transmission 22,5 to. Historical construction materials. Railway History set up the initial needs. wood. steel. vertical loads resulting from train weight. - PowerPoint PPT Presentation
Transcript of Prestressed Concrete Sleepers : Sustaining Railway Traffic Leonhard Moll Betonwerke
Leonhard Moll BetonwerkeEin Unternehmen der Leonhard Moll AG
Prestressed Concrete Sleepers:Sustaining Railway Traffic
Leonhard Moll Betonwerke
Leonhard Moll BetonwerkeEin Unternehmen der Leonhard Moll AG
Railway Historyset up the initial needs
Historical construction materials
• Gauge 1.435 mm• load transmission 22,5 to.
steelwood
Leonhard Moll BetonwerkeEin Unternehmen der Leonhard Moll AG
Requirements for sleepers: • compressive strength• form stability• bending tensile strength
lateral loads resulting from sinusodial run
vertical loads resulting from train weight
wood: oksteel: okconcrete: ?
Leonhard Moll BetonwerkeEin Unternehmen der Leonhard Moll AG
Concretehas 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 BetonwerkeEin Unternehmen der Leonhard Moll AG
The prestressed concrete sleeper established in the early 1950-ies
Leonhard Moll BetonwerkeEin Unternehmen der Leonhard Moll AG
Span systems for concrete sleepers
Longline Carrousel
instant demolding
post tensioned
mostly are prescribed by their production process
pretensioned
late demolding
or
Leonhard Moll BetonwerkeEin Unternehmen der Leonhard Moll AG
EN 13.230 (1-5) for concrete sleeperswere 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 BetonwerkeEin Unternehmen der Leonhard Moll AG
Thosti (Thormann & Stiefel)
Leonhard Moll BetonwerkeEin Unternehmen der Leonhard Moll AG
DSA (Dyckerhoff Span Anchor)
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Longline
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Wayss & Freytag
Leonhard Moll BetonwerkeEin 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 BetonwerkeEin Unternehmen der Leonhard Moll AG
Thank you for your attention
Leonhard Moll Betonwerkereliable since 1929
Leonhard Moll Betonwerke GmbH & Co KGLindwurmstr. 129a, D-80337 [email protected]
