Green Tracks en 2011 eBook

8/12/2019 Green Tracks en 2011 eBook

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| ATD-G and RHEDA CITY GREEN

The green tracks for urban traffic


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ATD-G and RHEDA CITY GREEN


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We develop innovative track systems, to help you get ahead

fast and safely. And what are your plans?

RAIL.ONE - the way to go

>>

Ecologically oriented and cost-effective

Track systems are frequently designed from a

purely technical point of view, and too often repre-

sent a foreign body in the urban landscape. Devel-

opment of the RAIL.ONE Green Track, however,makes possible a much more pleasant appear-

ance by improved integration of tracks into the

urban landscape. Additional vegetated surfaces

beautify the entire urban landscape, and allow use

of the track area as a design element. At the same

time, the municipal environmental balance ben-

ets from this type of track system: the Green

Track improves air, soil, and groundwater condi-

tions. The structured surface of the green space,

and the advanced elastic rail fastening common

to modern tracks, result in more favourable air-

borne-sound emission and structure-borne noise

in comparison to conventional track models with-

in the city.

In the nal analysis, everyone gains from the bene-

ts of green tracks: city residents, passengers, and

the transit authorities. RAIL.ONE offers a selection

of various ballastless track systems as green-tracksolutions:

ATD-G, as a system directly supported on

asphalt supporting layers

RHEDA CITY GREEN, as a monolithic system

on a concrete base.

Both models are presented on the following pages.


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ATD-G is derived from the ATD system already proved successful in

high-speed trafc applications for railways.

ATD-G the Green Track

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ATD-G structural track design

The track system ATD-G (which stands for Asphalt

supporting layer for Track Direct support, Green)

is a ballastless track system in which a crosssleeper track panel, consisting of concrete bi-

block sleepers and the connected rails, is directly

installed onto an asphalt supporting layer with ex-

act height tolerance. The modular principle used

here enables effective derivation of solutions for

the individual requirements of public transport au-

thorities. The basis for this work is a uniform sys-

tem structure for all elements of the track route:

e.g., straight and curved through-track sections,

curved track with cant, train stations, turnouts,

transitions to other rail proles, and crossings for

pedestrians and vehicles.

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The most important ATD-G characteristics:

Continuous track stability and long life cycle

Simple and transparent structure of the system

Flexible layout possibilities Favourable installation by mechanized processes

Short construction periods, with resulting short

interruption of rail trafc

Minimum interference with private motorized

transport during installation

Easy cleaning

Modular adaptation to various road construction

types

High resistance to corrosion caused by parasitic

current.


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System cross-sections

Low vegetation cover

Mixed vegetation cover

High vegetation cover

2500

Gauge

Substrate

Asphalt supporting layer

Waterbound macadam

230

200

Geotextile

335

200

310

200

ATD-G: SYSTEM OVERVIEW

2500

Gauge

Substrate


Waterbound macadam

Geotextile

2500

Gauge

Substrate


Waterbound macadam

Geotextile



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Low, high, or mixed

ATD-G can be easily adapted to the specic demands of the individual trafc

authorities. Since the basic structural design is always identical, the differing

solutions result from modular adaptation for various types of vegetation.

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Track bed with low vegetation coverage, to

the top edge of the sleepers

The intentional objective of this track system is to

preserve the technical character of the facilities,but at the same time to enhance the townscape.

Even after vegetation growth, the rail fastenings

remain visible. Excessive growth of vegetation on

the tracks is prevented by means of the plates t-

ted between the sleepers.

Track constructions with mixed vegetation cover

are also possible.

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Track bed with high vegetation coverage,

up to the rail head

The aim of this solution is optimum integration

into the environs so that the rails are barely vis-ible. Chamber elements, made of plastic or rub-

ber, directly mounted onto the sleepers, prevent

the vegetation from growing up to the rails. In this

way, airborne sound from the tracks is consider-

ably reduced. By addition of solid material (e.g.,

drainage concrete for additional bonding of the

sleepers onto the asphalt base layer), it is also

possible to make the tracks passable for road ve-

hicles in case of emergencies.



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Basic track

Completed supporting asphalt (three layers), with

height exactness of 2 mm, and with integrated lateral-

force base support

Sub-grade prepared for asphalt cover

Placing the sleepers on the

completed asphalt supporting layer

Installed and properly aligned track panels




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Green-track chamber elements for the spaces between the

rail head and rail ange, with ballast lling for vegetation

Graded track before planting vegetation

Completed track with turf

Filling of the aligned track panels with a mineral drainage

mixture, to enable access by emergency vehicles

Green-track chamber elements for the spaces between

the rail head and rail ange; with geotextile cover layer

The DRESDEN model

The BERLIN model

Placing of rolled turf on a plastic honeycomb structure, to

enable vehicle support

The ATD-G Green Track in operation



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Special solutions

Advanced urban-trafc systems promote mobility and set desired accents.

Track systems must harmoniously integrate into the urban architectural

landscape - and satisfy a great variety of requirements for functional and

representational purposes. The possible solutions are just as individual as

the cities in which they are implemented.

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Customized solutions

ATD-G offers further proven solutions that go be-

yond straight and curved through-track sections.

These exible options offer project planning and

design engineers a complete portfolio of track ele-

ments that allow comprehensive green-track plan-

ning e.g., for the following:

The areas around train and tram stations

Rail crossings for pedestrians and vehicles

Rail transitions to ballasted track sections,

or to other ballastless track systems

Turnouts with an especially designed ATD-G

solution, and with concrete sleepers

Track curves with small radii

ATD-G track systems with grooved rails and

transition to track panel

ATD-G track system at the transition zone

from vignol to grooved rail proles

Urban station executed

with the ATD-G system

Turnout on concrete sleepers

with the ATD-G system


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Reference projects

Each project is just as individual as the contracting customers company

itself. The special circumstances at the construction site, and the

customers special requirements, are equally essential. Owing to its

exible system structure, the ATD-G Green Track system has been

successfully implemented in numerous cities.

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Berlin Public Transport Authority (BVG)

Beginning as early as 1995, the Berlin Public Trans-

port Authority (BVG) constructed a two-track pi-

lot section. This project realized a model featur-

ing tracks installed ush, at sleeper height, with the

street surface, and planted with sedum. The out-

standing results obtained at this location prompted

the BVG in Berlin to stipulate that the ATD-G model

would be the standard form of implementation in its

network, and that it would be realized in future proj-

ects. After these successful trials, the BVG had exe-

cuted over 16,000 metres of ATD-G Green Track on

several projects. In the meantime, the Berlin Pub-

lic Transport Authority has, in several development

stages, raised the vegetation of the track system to

the level of the rail head.

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Hanover Public Transport Authority (stra)As part of the infrastructure measures for the EXPO

2000 Worlds Fair in Hanover, the municipal public

transport authority executed approx. 8,000 metres

of the suburban passenger line to the EXPO site as

ATD-G. The vegetation used on the Green Track was

in the form of sedum mats and seed-planted turf,

both up to sleeper height. Concrete slabs installed

in the spaces between the sleepers prevent the

vegetation from covering the rails. Now, after more

than seven years of operation with heavy usage of

the track facilities the position and the height of

the rails remain stable.

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Cologne Public Transport Authority (KVB AG)

In late April of 2003, the Green Track was put into

operation on the tram line running down the Co-

logne street Markgrafenstrasse. The system im-

plemented for the 2,000-metre tram line was the

ATD-G, with sedum planted up to sleeper height. As

a result of more stringent requirements placed to

prevent vibration and airborne noise, the E 14 Voss-

loh Fastening System was used on this project.

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Dresden Public Transport Authority (DVB AG)

In 1996 the Dresden Public Transport Authority in-

stalled an attractive turf track in two construction

phases, with a total length of 1,400 metres. The turf

was installed in the form of rolled sod, with grass up

to the level of the rail head. Special elements that

ll the space between the rail head and rail ange

provide insulation and prevent the turf from grow-ing up to the rail. Both of these measures reduce

the airborne noise emission to low levels. In order

to allow rescue vehicles to use part of the section of

the track, the track panel was lled with a mixture

of mineral material used for drainage, and plastic

honeycomb material was installed in the turf area.

Now, after eleven years of operation, the track is

still in outstanding condition, and satises the cli-

ents stringent expectations for track-position sta-

bility, noise-emission reduction, and vegetation.



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RHEDA CITY GREEN is the green-track alternative of the RHEDA

CITY model the system with long years of proven operation in

urban transit.

RHEDA CITY GREEN

the appealing alternative

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Modern ecology plus advanced technology

For the RHEDA CITY GREEN model, modied bi-block sleepers with lattice girders are concreted

into a compact concrete slab. A cover with turf

or sedum provides an attractive optical impres-

sion. This system combines the functional and

safety advantages of absolutely stable track po-

sition with the cost-efciency benets of practi-

cally no maintenance. In Germany, projects with

the Green Track have already been executed in a

number of cities: Cologne, Dsseldorf, Karlsruhe,

Mannheim, and Berlin. This ballastless track sys-

tem has also been implemented in The Hague,

Netherlands.

>>

Ecologically benecial

Compared to other forms of track, the combina-tion of vegetation and rail systems offers an op-

tically attractive variation. Vegetation of track

surfaces dampens the noise level and minimizes

maintenance costs. Track with turf in fact redu-

ses noise at its very source. The Green Track also

allows cost-effective solutions in cases of espe-

cially strict requirements placed on vibration pro-

tection and on the propagation of structure borne

noise.


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System cross-sections

S 49 rail prole

Green-track chamber

elements

Elastic rail pad

Steel brackets

Adjusting bolts are removed

after concrete casting

Bonded-bre matting

Vegetation

Track containment

C30/37 structural

concrete

Contact plates

(remain in concrete)

Non-bound support

layer

Drainage shaft if requiredThe Berlin model

The Karlsruhe model

Track containment

C30/37 structural

concrete

Contact plates

(remain in concrete)

Non-bound support

layer

Drainage shaft

S 49 rail prole

Elastic pad

Green-track chamber

elements

Pressure-distribution plate

W-14 fastening

Adjusting bolts are removed

after concrete casting

Electrically-insulating rail-ange

sheathing

Vegetation

RHEDA CITY GREEN: SYSTEM OVERVIEW

TOR

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Attachment of the rail-ange sheathing

Completely assembled and aligned track panels

Concreting of the track panels

Concreted track with green-track chamber

elements and level crossing

Positioning of the bi-block sleepers

Completed track

Steps of work

RHEDA CITY GREEN: SYSTEM OVERVIEW


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Green Tracks en 2011 eBook