Rail fastening systems
for concrete sleepers
System W 14
System W 14/W 21
with tension clamp Skl 14/Skl 21
Simple, reliable, safe and maintenance-free.
Fully automatic track-Iaying. Proven throughout the world.
DESIGN Rail tensioning and creep
The rail is permanently ten-
The W-shaped tension clamp per- Sleeper screw Ss
sioned by spring-actuation by
manently clamps the rail to the con- means of the two spring arms
crete sleeper by means of of the with a spring deflection of ap-
outer spring arms. prox. 13 mm and a toe load of
Rail approx. 2 x 10 kN. The requi-
The rail is laterally guided through site high creep resistance of
the angled guide plates. These form Skl 14 the rail, which prevents the
a gauge true rail channel. The verti- Angled guide dangerous fracture gap in
cal and horizontal forces transmit- welded rails, is obtained
ted through the rail are transferred Elastic Rail pad
thereby. The track stability is
directly to the concrete sleeper via Zw
provided at the same time.
the angled guide plates without Screwed insert/
loading the rail screw to bending
The fastening system has additional
second stiffness as a result of the
middle bend of the tension clamp,
which projects above the rail foot
(steep curve of the spring charac-
teristic). Overloading of the spring
arms and consequently plastic
deformation is thereby excluded.
The middle bend also serves to
protect the rail against tilting.
Pre-assembly Different rail sections on the same sleeper
All the fastening components can be man- Different rail sections, e.g. UIC 60, UIC 54
ually or automatically pre-assembled in and S 49, can be used on the same sleeper Rail profiles
the sleeper factory. The rail is applied at with the same track gauge through simple
the construction site. Fastening compo- exchange of the angled guide plates. gauge
nents can be lost neither during transport
nor during track laying. Track adjustment
A track adjustment of ± 10 mm in steps of
Assembly 2.5 millimetres is available as standard.
The sleeper screw is loosened by 2-3 turns.
The tension clamp is pushed on the rail Electrical insulation
foot and tightened with torque of approx. The rail fastening system W 14 is com-
200 Nm. A simple work step which re- pletely electrically insulated. No additional
quires no special training. Assembly can insulating components are required be- UIC 54
be carried out using simple commercially tween the clamping element and the rail
available screwing machines or automatic base.
Exchangeability The Vossloh rail fastening system requires
All components are exchangeable. no regular maintenance.
Protection against tilting Neutralisation
Any uplifting or tilting of the rail which oc- No fastening elements have to be re-
curs during tamping of the track or when moved from the sleeper with continuous
running through narrow track curves is ab- welding of the rail (CWR). The sleeper
sorbed by the middle bend after it has screws merely have to be loosened but
overcome the small air gap (between the not disassembled.
middle bend of the tensioning clamp and
rail base). Permanent deformation of the Height adjustment
outer spring arms is therefore excluded. The Vossloh rail fastening system W 14 can
be adjusted in height by using height reg-
ulation plates. This is also referred to as
anti-frost wedge fastening in many coun-
System W 21 with tension clamp Skl 21
The W 21 is used for rail pads with stiff-
nesses < 50 kN/mm.
Force/spring deflection of the tension clamp Skl 14 Height adjustment
Protection Height adjustment plate
Toe load F (kN)
0 5 10 15 20
Spring deflection f (mm)
System W 14
Instructions for assembly
System W 14
Place all components of the fastening system Tighten sleeper screws (tightening
in pre-assembly position torque max. 50 Nm)
gap: 0.5 mm
Loosen sleeper screws Move tension clamp in assem- Tighten sleeper screws; Mid-
(approx. 2 – 3 turns) bly position (spring arms have dle bend of tension clamp
to rest on rail foot) shall contact rib of angled
guide plates (tightening
torque ~ 200 Nm)
www.vossloh.com Vossloh Fastening Systems GmbH
P.O.Box 18 60
Phone: +49 (0) 23 92/52-0
Fax: +49 (0) 23 92/52-375
D-58778 Werdohl email@example.com