Graduated Elasticity for
Grooved Rail Switcheswith Prefabricated Components

123451

Rail sealing

2

Chamber ill elements

3

Sylodyn® elastic rail support

4 Rail base sheathing
5

Bottom casting

nvironmentally friendly transportation makes a valuable contribution
to improving urban quality of life. Linenetworks are increasingly being expanded in order to further increase
the attractiveness of rail transportation. Elastically supported track systems have established themselves as
an effective solution for smooth andgentle travel.

EProperties— Uniform rail box profile
system with defined rail
deflection over the entire
track section, including
the switch area
— Rapid installation
independent of theweather using prefabricated parts— Uniform quality of electrical isolation over theentire track section andswitch area

In order to guarantee a defined andconstant rail deflection, an elastic
grooved rail box profile should consistof prefabricated elements with precisely understood elastic properties.
In particular, the key rail support must
be designed as elastomere strips of a
uniform thickness. In relation to this,a stiff bottom casting is used forcompensation between the heightsof the rail and the concrete slab.

sections require intelligent, graduatedreduction of the stiffness of the elastomere beneath the rail. This achieves anearly constant rail deflection throughout
the entire switch area that corresponds tothat of the whole track section.
Getzner Werkstoffe offers an optimal
solution for stiffness distribution in theswitch that also takes the required special
components into account.
Our services include:— Design of the elastic grooved rail box
profile— Creation of installation plans— Coordination with the switch contractor— Delivery of system components— Performance or supervision of installation and acceptance inspection— Guarantee— Follow-up measurements

Continuation of the elastic rail support
into the switch area represents aparticular challenge. Different support
surfaces for the rail base and varying
moments of inertia in the rail cross-www.getzner.com

How an optimized, elastic grooved railbox profile in the switch area affects
rail deflection is demonstrated here
based on the example of a standard
right-hand turnout.
he rail section of a tie rod track thatis critical for the calculations runs
over the switch panel and the frog
(dotted orange line). Assuming amaximum static rail deflection in thestraight track of 1.3 mm (axle load: 12 t)
and in the case of a homogenous
stiffness distribution of the elastomere
under the rail base, calculations yield a
60 % lower deflection in the switch
panel and 40 % lower in the frog area.

Rail deflection [mm]Stiffness optimizationin switch areas

0.0

Homogenous stiffness distribution
under the rail base

- 0.5

- 1.0

T- 1.5

Optimized stiffness distribution- 2.0

These abrupt changes to the rail
deflection can result in uneven runningof the vehicle as well as increased structure- and air-borne sound emission.
Graduation of the stiffness distribution
reduces the maximum difference of therail deflection in the switch area from
0.8 mm to 0.2 mm. This represents animprovement of 75 %. The result isgentle and smooth vehicle travel.

5Switch panel

102520Track position [m]15Closure panel

Frog area

Maximum rail def lection
along the rail section
through the frog
(12 t axle load)

www.getzner.com
AUSTRIA — Bürs

GERmAny — Berlin — munich

JoRDAn — Amman

JAPAn — Tokyo

InDIA — Pune

CHInA — Beijing

USA — Charlotte

DB RL en © Copyright by Getzner Werkstoffe GmbH | 01-2014
Cover photo: Ulrich Kissmann0