rockdelta vibration isolation brochure - uk - mail

7/27/2019 RockDelta Vibration Isolation Brochure - UK - MAIL

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RockDeltaHigh-efficiency mats for vibration isolation and ballast protection


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The world in motion RockDelta Vibration Isolation is Common Sense

02

Stone wool as

high-efficiency

resilient mats


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03

Dealing with ground-borne

Vibration

Vibration caused by rail traffic

The passage of trains, trams and other kinds of rail

traffic generates vibrations of many kinds. These

mainly stem from contact between wheels and rails

whose surfaces have a non-perfect geometry, and

also to the passage of wheels and bogies over track

joints and sleepers.

Such vibration is transmitted through the entire

track structure rails, sleepers, ballast and sub-

layers and propagates through the subsoil aswaves. People, who live and work close to such

railway lines or above railway tunnels, experience

these waves as vibration. Historical buildings and

delicate machinery in nearby buildings are also

adversely affected by vibration of this kind.

Attenuation of vibration using RockDeltaresilient mats to deal with trackvibration

It is possible to attenuate the effects of such

vibration by decoupling the track from the ground,

using a resilient support layer.

The unique properties of RockDelta anti-vibration

mats provide a highly efficient, durable and

environmentally friendly solution to most of the

vibration problems encountered in the vicinity

of rail and tram tracks. This solution results in a

considerable improvement in the quality of life forthose nearby.

Effective,

durable solution

to vibration

problems

Experience with resilient matssince 1974

Long-term fatigue resistance

Excellent dynamic properties,with high volume compressibility

Outstanding longevity anddurability, with consistentperformance throughout

No changes in functional performance atsub-zero temperatures

Functional performance unaffected by water

High resistance to chemical, biological andenvironmental factors

Unique fire and smoke safety properties withstands temperatures in excess of 1000C


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04

As a member of the Rockwool Group the worlds

largest manufacturer of stone wool RockDelta

aims to maintain a comfortable environment by

controlling undesirable ground-borne noise and

vibration.

Our innovative product portfolio consists of mat-

based anti-vibration isolation systems that helpreduce and manage ground-borne vibrations. There

are two distinct product ranges RockBallast

for dealing with vibration in ballasted tracks and

RockXolid for dealing with vibration in floating slab

tracks.

The RockDeltaVision

RockDelta

a member of the

Rockwool Group


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Stone wool components

RockDelta products are manufactured at Rockwool

factories in accordance with Quality System

Certificate, EN ISO 9001:1994 and Environmental

Management System Certificate 14001:1996.

The quality of our products and a responsible

environmental policy are key features in the

RockDelta way of doing business. Our vibration

isolation solutions are 100% recyclable and non-

combustible.

Environmentally friendly products

Environmental responsibility is of vital importance

to RockDelta. The company is part of the Rockwool

Group, and RockDelta follows the stringent,

award-winning, Rockwool Group environmental

responsibility policy. This includes environmental

analysis of all projects involving new production

equipment or new products, an elaborate

environmental management system and the

conduct of environmental audits at the Groupsmanufacturing plants.

Stonewool and the

Environment

Diabase

LimeRecyclingbriquettes

Coke

EnvironmentalManagement

System Certificate

14001:1996

RockDelta

products are 100%

recyclable


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Easy to handle

Easy to fitEasy to install

Next-generation resilient matsolutions for ballast tracks

The RockDelta solution for resiliently supported

ballast tracks consists of a patented dual-density

mat, with a low-density elastic bottom layer and

an integral high-density force-distributing toplayer. This is combined with a composite product

comprising two membranes of non-woven geotextile

and a load-distributing core.

This purpose-made geotextile ensures high puncture

resistance, high tensile strength, superb filtering

characteristics and excellent water flow capacity.

At the same time, it deforms perfectly under the

load exerted by the ballast, as well as making it

particularly easy to replace the ballast as and when

required.

The RockBallast series is available in two versions

Premium and Standard each with distinctive

features, advantages and benefits.

Both feature the same advanced fibre structure,

providing a resilient mat that is uniquely ductile

and durable. The RockBallast Premium series also

encompasses all the innovative features that have

become the hallmark of a durable, high-performance

resilient mat for ballast tracks.

The RockBallastPremium

features exceptionally fineproduction tolerances on key functional parameters,

an extra-broad spectrum of operating loads, the

use of a special hydrophobic geotextile and

insertion loss calculations based upon classic

impedance theory. Customised mat

dimensions are also available.


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Resilient mat solutions forfloating slab tracks

The RockDelta solution for resiliently supported

floating slab tracks consists of a continuous, full-

contact system that introduces a durable, high-

efficiency spring element into the track substructure.This ensures resilient decoupling of the dynamic

behaviour of the concrete slab and track system in

relation to the ground beneath.

The RockXolid series is available in two versions

Premium and Standard each with distinctive

features, advantages and benefits.

Both feature the same advanced fibre structure

providing a resilient mat that is uniquely ductile

and durable. The RockXolid Premium series also

encompasses all the innovative features that

have become the hallmark of a durable, high-performance resilient mat for floating slab

tracks.

The Premium series features exceptionally fine

production tolerances on key functional parameters,

an extra-broad spectrum of operating loads, built-

in drainage channels and the use of insertion losscalculations based upon classic impedance theory.

Customised mat dimensions are also available.


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0 20 40 60 80 100

0,000

0,020

0,010

0,030

0,040

50 Hz20 Hz 100 Hz

08

Fatigue resistance

test in accordance

with German

Railways norm DB

BN 918 071-1

Dynamic Stiffness at 5 mm/s RMS, 10 kN/m2 static load

Milions of Fatigue Load Cycles

N/mm3

Large-scale fatigue test

RockDelta resilient mats provide outstanding

resistance to mechanical stress fatigue and to

influences from any environment in which the

track is located. The key feature is that functional

performance, as well as both dynamic and static

stiffness, remain virtually unaltered, even after

decades of use.

Numerous laboratory and in situ tests have

confirmed this. These include a large-scale fatigue

test conducted at the Danish Technical University,

extending over more than 15 months and involving

more than 100 million dynamic load cycles. The

final conclusions of this test were carried out by the

Chair and Institute for Road, Railway and Airfield

Construction at the Technical University of Munich

in Germany.

Long-term practical experience

Our practical experience with the use of RockDelta

resilient mats goes back a long time. As early

as 1978, the Norwegian National Railways (NSB)

decided to install anti-vibration mats based on

stone wool in a section of tunnel track in the capital

city of Oslo, right beneath the cathedral.

In 1996, as part of a preliminary investigation to

determine the best possible method for vibration

isolation for the planned Gardermobanan line, NSB

decided to conduct extensive research (both in

situ and in vitro) into the long-term performance

characteristics of RockDelta resilient mats. The test

results showed that these mats had retained their

functional performance over the full 18 years since

they were laid.

Long-termbehaviour

Long-term behaviour

of stone wool in a

ballasted track under

adverse climatic

conditions


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Long-term

durability and

constant stiffness

in water

No functional

performance changes

sub-zero temperature

Dynamic stiffness and water

Water may well be present in the rail substructure

for long periods of time due to rain and flooding,

for example. It is therefore crucial that the resilient

components used in the track substructure have a

high resistance to water and its influence, to ensure

long-term durability and maintain the geometry of

the track.

To achieve this, RockDelta resilient mats display

outstanding efficiency and durability even after

decades of rail freight operation under adverse

climatic conditions, including complete submersion

in water.

Ambient temperatures

Ambient temperatures both high and low have

a significant influence on the resilient components

of rail tracks.

It has been demonstrated that RockDelta stone

wool-based resilient mats provide high-performance

track vibration isolation, regardless of ambient

temperatures. A test was carried out at the Technical

University of Munich in Germany to corroborate this.

Samples of RockDelta resilient mats were subjected

to large sub-zero temperature fluctuations while

measuring the Low Frequency Dynamic Bed Modulus

in accordance with German Railways norm DB BN 918

071-1 at pre-defined temperatures. The conclusion

was that RockDelta resilient mats retained their

vibration mitigation performance regardless of sub-

zero or even very high temperatures.

RockDelta

resilient mats and the climate

Finse. Photo: Svein Ulvund


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P P

P

10

Poissons Ratio

high-volumecompressibility

A materials suitability as a resilient component in

anti-vibration rail track installations is governed by

many different factors. Firstly, the material needs

to have a suitable load-deflection curve with a wide

operating range, along with the ability to achieve

a working point on such a curve that ensures an

ample dynamic range over which the material canprovide support.

In many cases, the materials ability to absorb loads

with no significant change in its elastic properties is

almost equally important. This is often described as

the bulk elastic (volume compressibility) properties

of the material. These determine how much the

material compresses under a given external load.

RockDelta resilient mats possess a uniquely highdegree of volume compressibility, which means

that the material has a Poissons Ratio of almost

zero. This indicates that a RockDelta anti-vibration

solution will be independent of the dimensions of

the actual track bed footprint. The material contains

voids that absorb the compression of the material.

For a resiliently supported floating slab track, this

is an important advantage because the stiffness of

RockDelta resilient mats does not vary as a function

of the track bed width.

Compressibility

properties


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Unique fire

and smoke

safety

properties

Within rail-based transport, fire and smoke safety

are vitally important, with potentially far-reaching

consequences not least for tracks laid in tunnels. It

is therefore important to have accurate knowledgeabout how every component in the tunnel structure

reacts to fire, as well as about the degree of fire

resistance it can provide.

RockDelta stone wool-based anti-vibration mats

display unique inherent fire and smoke safety

features, as evidenced by the fact that these

products are classified as Euroclass A2 (s1, d0).

RockDelta anti-vibration mats therefore help

ensure effective protection against fire and smoke,

reducing any risk of loss of life, structural damage

and financial losses.

Non-combustible

Minimum smoke generation

No emission of toxic gases

No burning droplets

Withstands temperatures in excess of 1000C

Euroclass A2 (s1, d0) according to the CEN fire

safety standard

Fireresistance

Standard Fire Curve (iso 834)

1200C

1000C Stone wool melts

800C

600C Glass wool melts

400C Steel loses load bearing capacity / polystyrene foam burnes

200C Polyurethane foam burns

0C

20 40 60 80 100 120 min.


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RockDelta a/s

(Rockwool A/S)

Hovedgaden 584

DK-2640 Hedehusene

Denmark

Tel +45 4656 5020

Fax +45 4656 5080

[email protected]

www.rockdelta.com

RockDelta, RockBallast, RockXolid and NoiStopare registered trademarks of RockDelta a/s. Rockwoolis a registered trademark of Rockwool InternationalA/S. RockDelta a/s reserves the right to alter oramend the specification of products without notice asour products are constantly being improved. Effortsare made to ensure that the information containedin this brochure is correct at the date of publication.Whilst RockDelta a/s will endeavour to keep itspublications up to date, improvements might be madeto the products in between publications, or otherdevelopments or regulatory changes affecting theaccuracy of the information contained in this brochuremight take place. The above applications do notnecessarily represent an exhaustive list of applicationsfor RockBallast/RockXol id. RockDelta a/s does notaccept responsibility for the consequences of usingRockBallast/RockXol id in applications different from

those described above. Expert advice should be soughtwhere such different applications are contemplated, orwhere the extent of any listed application is in doubt.Nothing in this brochure shall be regarded as grantingany warranties or guarantees as to the products orapplications.

Local contact:

A member of the Rockwool Group

rockdelta vibration isolation brochure - uk - mail

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