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High density mineral wool has good sound deadening properties and can be encased in either high specification pre-galvanised and painted steel or aluminium panels to produce a light weight sound absorbing barrier. For more info, please visit following link: http://www.grammbarriers.com/downloads/gramm_aluminium_ml.pdf

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Aluminium and Steel Noise Barriers - Gramm Barriers

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Aluminium and steel noise barriers gramm barriers

Gap Gramm (steel) 27/2/03 10:13 pm Page 1

GRAMM

GRAMM BARRIER SYSTEMS LTD

ENVIRONMENTAL AND SECURITY BARRIER SPECIALIST

ALUMINIUM

AND STEEL

BARRIERS

High density mineral wool has

good sound deadening

properties and can be encased

in either high specification pre-

galvanised and painted steel or

aluminium panels to produce a

light weight sound absorbing

barrier. These are used

extensively throughout Europe

within urban areas and on

structures.

Steel galvanised and painted absorptive noise barriers designed for heavy traffic

on main roads and motorways.

Each panel is made of

corrosion- resistant aluminium

steel, and perforated for

acoustical absorption.

The size and pattern of the

perforations are designed to

protect and maintain the

sound-absorptive capability of

the acoustic fill inside the

panels. The reverse side away

from the road, is made of non-

perforated galvanised steel,

also corrosion-resistant.

Metal structures cut the build

up of reverberant sound

between parallel barriers,

resulting in noise reduction

higher than that provided by

the hard-surface alternates.

A unique design feature of

the aluminium and steel barrier

construction is that individual

panels can be removed and

replaced. Panels are not bolted,

welded, or otherwise

permanently fastened to each

other or to the support posts.

Should replacement be called

for as a result of structural

damage, no more than three

workmen using ordinary hand

tools will be able to do the job.

The light weight – 6lb/sq ft

(29.3 kg/m2) of the noise shield

panels also make them the

prime choice for barrier

construction atop existing

bridges, overpasses, or other

elevated transit structures

which cannot support concrete

panels of the same thickness –

4in. (102mm) weighing in at a

heavy 37 lb/sq ft (180.6 kgm2).

Aluminium modular system designed for easy

installations on roads and railways.

Lightweight aluminium panel system suitable for

bridges and underpasses.

Combined aluminium absorpative and acrylic barrier system allowing bespoke architectural designs.

All components are

maintenance -free

and recyclable.

FS 57589


Aluminium and steel noise barriers gramm barriers

Gap Gramm (steel) 27/2/03 10:13 pm Page 2

Octive Band, Hz

Sound Transmission Loss, dB

Sound Absorbption Coefficients

63

-

-

125

-

-

250

-

-

500

-

-

1K

-

-

2K

-

-

4K

-

-

8K

-

-

STC

-

-

NRC

-

-

Caption to come

Technical specification:

A Perfected System

Gramm noise

protection elements

meet all requirements:

Acoustic Performance:

The acoustic performance meets all the current UK and

European regulations for roadside applications.

• exceeding the noise

values demanded

• guarantee a large measure of

traffic safety

• are steady and dimensionally stable

• they are resistant to ageing and corrosion

• they are dimensionally accurate

• they are colourfast and resistant to fire

• they are resist impacts from stones and are largely

maintenance-free

Random Incidence Sound Absorption:

• Tested to BS 3638 (BS EN 20345: 1993)

• Noise reduction coefficient (250-2000Hz): a=0.98

• Tested to proposed CEN standard, pr EN 1793:1

• DLa= 16 dB, Class: A4

Sound Insulation:

• Tested to BS 2750: Part 3 (BS EN20140: Part 3)

(ISO 140/111)

• Weighted Sound Reduction Index, Rw,= 30dB

(BS 5821: 1984)

• Tested to proposed CEN standard, pr EN 1793:2

• DLR= 24.6 dB, Class: B3

Panel Dimensions:

Post Spacing:

Panel Length:

Effective Panel Height:

Panel Width:

2.0m

1.95m

0.4m**

3.0m

2.95m

0.6m

0.125m

4.0m

3.95m*

0.8m**

Nominal

* Other dimensions to special order.

** Nominal dimensions and to special order only.

Posts:

Structural Steel Universal Columns from low

carbon steel to BSEN 10025, 152mm x 152mm

for standard systems.

Absorbant Infil:

75mm Thick mineral wool with black glass

tissue face. Density 60kg/cubic meter.

Finish:

Top and bottom Aluminium profiles in natural finish.**

Panels in a choice of Polyester powder coated, semi gloss

(30%) colours

Posts in a hot dip galvanised finish to BS 729.**

* Can be powder coated to special order.

GRAMM

Contact

Stephen Whittle

Tel:01323 872243 • Fax:01323 872244

E-mail [email protected]

www.grammbarriers.com


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