Transcript Leonhard Moll Betonwerke

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]