ALUMINIUM AND STEEL BARRIERS - GrammBarriers

1. 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

2. 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 - - 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 info@grammbarriers.com www.grammbarriers.com