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 lateral loads resulting from sinusodial run vertical loads resulting from train weight
Requirements for sleepers:
• compressive strength
• form stability
• bending tensile strength wood: ok steel: ok concrete: ?

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

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 pretensioned instant demolding
Carrousel post tensioned 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

Wayss & Freytag
Leonhard Moll Betonwerke
Ein Unternehmen der Leonhard Moll AG

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 info@moll-betonwerke.de