Vibration Isolation by Floating Slab Track Systems

Due to the high elasticity of the

steel the springs, GERB floating

track slabs combine two essential

features:

1. highest possible efficiency of

isolation,

2. a cost-saving low construction

height.

GERB Floating Slab Track Sys-tems make a classical „Heavy“ Mass-Spring-System look old.

There is no longer need to waste

space and money on massive and

bulky concrete slabs requiring spa-

cious and expensive tunnels.

In addition, they offer a number of

benefits by a simple and cost sav-

ing installation.

Highly-Effective Noise and Vibration Isolation by Floating Slab Track Systems

EBS-elementThe GERB Floating Slab Track Systems

The Situation

Today, rail-bound systems are modern

and serviceable transport systems for

both people and goods and often the only

solution to combat 21st century traffic

disaster. However, all types of trains, even

the wheel-less Maglev trains, are known

to induce disturbing noise and vibration.

As in congested areas, the close vicinity

of rail tracks to buildings is almost una-

voidable, conflict in respect of the trans-

mission of noise and vibration to people

or sensitive equipment are inevitable.

It‘s a vibrating and noisy world! The Solution

GERB have developed a variety of anti-

vibration bearing systems which suc-

cessfully reduce the transmission of train

induced vibration either at the nearby

buildings or, more efficiently, at the

source.

Today, GERB Floating Slab Systems

represent highly effective and reliable

vibration mitigation measures recognized

by experts in many parts of the world.

Based on helical steel springs, they are

designed for system natural frequencies

as low as 4 to 8 Hz. That means, excel-

lent attenuation levels are achieved not

only in the upper or audible but also in

the lower frequency range, where the

vibrations are clearly perceptible.

GERB Floating Slab Systems are successfully installed in tunnels,

above ground, and on elevated rail tracks.

Different types of springs and spring

elements are available to meet the

requirements set by the respective

conditions on site and by the type of

trains, including

• trams,

• urbanmasstransitsystems,

• heavyfreighttrains,

• high-speedpassengertrains.

GSI-element

GSI-housings in place

The GSI-System

Jack-up type elements enable the build-

ing of the concrete track slabs directly

on the substructure. This dispenses with

expensive and time-wasting formwork or

costly epoxy upstands to compensate for

uneven surfaces. The slabs are lifted and

adjusted by compressing the springs by

means of a handy hydraulic tool. Always

easily accessible from the top, the Co-

logne system allows fast readjustments

when necessitated, e.g. due to inadmis-

sible substructure settlement.

This technique is especially suitable and

cost-saving for mass-spring-systems

applied to crossings and turn-outs.

FST with ballast trough, Puchon Station – Korea

The KY-System/EBS-System

These low-built spring elements have a

high load-carrying capacity and thus allow

a larger spacing. They are arranged below

the slabs or, in order to save construc-

tion height, within lateral recesses. For

installation of the elements, the slabs or

troughs are lifted up from the substruc-

ture. Therefore lateral access to the slabs

is provided. In particular cases, e.g. if

the elements are used below wide slabs

designed for twin tracks or crossings,

hatches may be arranged for installation,

inspections or readjustments from above.

The EBS spring elements are preferably

arranged in slab recesses located under-

neath the rail. The access is provided

by centered openings in the slab.

FTS with seismic restraints in Central Tokyo – Japan

KY-system

GSI-system

KY-element

The GP-System

Prestressable elements with a high load-

ing capacity are used in elevated struc-

tures where the track is supported on a

large bridge slab or girder. They combine

the function of a bridge bearing with that

of an anti-vibration bearing. Already pre-

compressed by the manufacturer before

installation, they allow the building of the

superstructure on rigid supports which

are activated only after completion of the

structure.

In order to allow for structural temperature

expansion, they can be equipped with

slide bearings.

In seismic zones, GERB Viscodampers®

can be added to control the movements

of the track.

The Advantages

• Construction

Slab construction directly on the sub-

surface is most simple and does not

require bottom formwork. Epoxy up-

stands and lateral walls are not neces-

sary. Below crossings or turn-outs, long

and massive in-situ slabs are preferable

to prefabricated slabs.

• Design

The floating slab system can be accom-

modated to almost every situation. The

slabs are usually of lower design than

other systems. The steel springs take all

horizontal train loads. Lateral bearings

are not required. Access from above

makes spring installation, adjustments

and inspections fast and simple.

• Maintenance

GERB spring elements generally do not

require maintenance. They are fatigue-

proof and designed to high longevity.

However, periodical spot checks should

be carried out including the inspection

of the local conditions.

• Efficiency

Steel spring systems provide the high-

est attenuation levels (35 - 40 dB).

Insertion loss values of 20 to 25 dB are

achieved even in the lower frequency

range (> 25 Hz). Regarding audible

vibration, further improvements are

achieved by adding the GERB Coil

Resonance Damping System (CRDS) to

the springs. All types of elements may

contain the same types of steel springs

providing the same efficiency.

• Costs

GERB Floating Slab Track Systems

provide high attenuation levels at

reasonable costs. Compared to other

systems, substantial cost savings can

be achieved with regards to construc-

tion, installation and maintenance.

GP-elements and seismic Viscodamper® supporting a metro line bridge, Xizhimen Station – Beijing, P.R.China

High-speed FTS (4 x 1200 m) on top of Cheonan Station – Korea

Reference List – extract from 125 km Floating Slab Tracks supplied by GERB worldwide

Country System, City first supply in operation max. Axle Load since kN

Brazil Suburban Railway, São Paulo 1999 210

Subway, Brasilia 2000 175

Subway, São Paulo 2006 175

China Subway, Beijing 2002 140

Subway, Shenzhen 2003 160

Subway, Shanghai 2003 160

Subway, Nanjing 2004 140

Subway, Guanzhou 2005 150

Subway, Chengdu 2010 140

Railway, Tianjin 2010 170

Germany Subway, Berlin 1994 90

Tramway, Bielefeld 1995 100

Tramway, Cologne 1997 100

Airport Transfer, Frankfurt 1997 70

Tramway, Stuttgart 2000 100

Tramway, Bochum 2005 100

Tramway, Heidelberg 2007 100

Japan Subway, Tokyo 2000 100

Intercity Railway, Tokyo 2004 150

Subway, Yokohama 2006 150

Railway, Fukuoka 2009 170

Norway Tramway, Oslo 2004 100

Russia Subway Moscow 2006 150

South Korea Railway, Puchon 1997 220

TGV High Speed Train, Chonan 1999 220

Switzerland Tramway Basle 2006 100

United Kingdom Subway, London 1999 100

USA Subway, Charlotte NC 2002 125

A KTX train speeds at 300 km/h through Cheonan Station – Korea

worldwide

EN ISO 9001 Certified Company

To receive a proposal for a vibration isolation system that will meet your shipbuilding requirements, simply send us the following data:

Machine type and manufacturerLayout plan or assembly drawingTotal weight and weight distributionSpeed of machinery or exciting frequenciesAny special requirements.

Based on these information our engineers will prepare a proposal and discuss it with you.

EQUITY SERVICES & SOLUTIONS CO.,LTD.

267/96-97, Sukhumvit Rd., Maptaphut, Mueng-rayong, Rayong, Thailand, 21150

Tel :+66 3860 9200Fax :+66 3860 9201

Mobile :+66 897 662 566,+66 863 252 004 LinkedIn : Manorom ChiewpanichEmail : manorom@esspower.com

: sukhontaros@esspower.com

www.esspower.com

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