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Gramm Barrier Systems Ltd is a leading supplier and installer of acoustic barriersnand high security fencing systems, including sliding barrier gates and turnstiles. The company is an accredited member of The European Fencing Industry Association and a ‘Link-Up’ approved Railtrack contractor.n

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Basic Types of Acoustic Barriers- GrammBarriers


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acoustic barriers

ACOUSTIC

BARRIERS

GRAMM

Gramm Barrier Systems Ltd is a leading

supplier and installer of acoustic barriers

and high security fencing systems,

including sliding barrier gates and

turnstiles. The company is an accredited

member of The European Fencing Industry

Association and a ‘Link-Up’ approved

Railtrack contractor.

Gramm offers a full design service for a

range of reflective and absorptive barriers.

All barriers have been designed to be

aesthetically pleasing, offering excellent

noise abatement properties.

GRAMM BARRIER SYSTEMS LTD

ENVIRONMENTAL AND SECURITY BARRIER SPECIALIST

• Timber barriers

Available as reflective or absorbing in a

range of heights from 1-6m, all barriers are

Highways Agency approved, conforming to

the latest Tec Memo HA65/94 (Part 1) and

HA 66/95 (Part 2), and are further backed

up with independent design checks and

P11. Sound attenuation for the reflective

systems are from Rw 22-35dB and Rw 35dB

for the absorptive system with an

absorption coefficient of 0.80 starting as

low as 200Hz.

• 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.

Low level absorbing barriers – Docklands Light Railway

• Transparent barriers

A range of systems manufactured from cast

acrylic, extruded acrylic and extruded

polycarbonate is available. All barriers have

been designed to be weather resistant,

highly transparent with light transmittance

of up to 92% and, in some cases, break

resistant with incorporated splinter-binding

polyamide threads. Available in thicknesses

from 10-20mm, all barriers conform to ZTV-

law 88 and fire behaviour to BS 476: part 7

and have sound insulation properties up to

32dB.

5m high timber absorbing barrier

for the control of industrial

noise – Gerber Foods

• Concrete barriers

Reflective or absorptive concrete barriers

are constructed from a wood fibre concrete

material and are designed to be highly

absorptive to road and railway generated

noise, with absorption exceeding 0.8 over

transport spectrum. The product is free

draining, self-cleaning and available in

various designs and colours.

Combined concrete absorbing

and transparent acoustic barrier

• Accessories

The Octagon Reducer is a sound absorbing

product designed to enhance the noise

reducing characteristics of any type of

acoustic screen. When the Octagon is

installed on a barrier, a relevant reduction

in diffracted sound energy is gained in the

shadow zone. This enables barrier heights

in new installations to be lowered at the

same time achieving the noise mitigation

values obtainable with conventional

barriers of at least 1m higher. Alternatively,

the Octagon can be used to improve the

performance of existing installations.

Timber reflective acoustic barrier for Railtrack – Beckenham Hill

GRAMM

• Sitework

A nationwide supply is available.

Contact

Stephen Whittle

Tel: 01323 872243 • Fax: 01323 872243

E-mail info@grammbarriers.com

GRAMM BARRIER

SYSTEMS LTD

Certificate No:1077