Highway Noise Barrier
Environmental Barrier
Description of Structure
The highway noise barrier fences are acoustic barriers in accordance with Clause 2504 of the specification for Highway Works. (1998 consolidation version) and Departmental Standard HA 66-95 – Environmental Barriers: Technical Requirements.
The fence has been laboratory tested in accordance with BS EN 1793:1998 (Parts 1-3) and has reached performance category B3 or A3.
The installation will be carried out by an installer registered to BS 9001:2000 Sector Scheme Document 2 C (The Design, Supply, Installation and Repair of Environmental Barriers (Structural))
Structural Type
The supporting posts of the noise barriers acoustic fencing are vertical cantilevers in structural steel sections embedded into mass concrete foundations of 1m depth x 0.45m diameter.
The infill panels are constructed using timber rails spanning horizontally between the supporting posts and vertical timber boards spanning continuously over the rails.
Absorptive panels will have a rockwool infill with a protective membrane over the face.
Foundation Type
The barrier will be founded in the existing ground on mass concrete foundations.
Articulation Arrangements
The posts act as vertical cantilevers and the panels act as simply supported one-way spanning slabs.
Proposed Arrangements for Inspection and Maintenance
Design life – 40 years, no major maintenance for 20 years. The environmental barrier should be inspected for maintenance during normal routine highway boundary inspections.
Materials and Finishes
Environmental Barrier:
The posts of the acoustic fencing are UB section steel Grade S275JR to BS EN 10025:1993, and will be galvanised to BS EN ISO 1461:1999, after fabrication. The posts will be embedded into isolated mass concrete foundations to a depth of 1m x 0.45 m diameter. The concrete mix for the foundations will be ST5 and there are no special requirements for resistance to ground sulphates for this site.
The timber components of the barrier will be treated using Tanalithe “E” (Green). The top will be finished with a once weathered capping. The reflective face of the fence will consist of 150mm*22mm vertical boards and 65mm cover strips, nailed through into the rails and gravel board using galvanised annular ring shank nails.
All timber to be preservative treated to BS 5589:1989.
Technical
| Fence height (m) | Panel Size WxH (mm) | No. “V” Bars per panel | Overall Length of Post | Post Size (mm) | No. Clips Per Post | No. Clips Per Corner |
|---|---|---|---|---|---|---|
| 1.2 | 1230 x 3005 | 2 | 1800 | 60 x 60 | 3 | 6 |
| 1.5 | 1530 x 3005 | 3 | 2100 | 60 x 60 | 4 | 8 |
| 1.8 | 1730 x 3005 | 3 | 2400 | 60 x 60 | 4 | 8 |
| 2.0 | 1930 x 3005 | 3 | 2700 | 60 x 60 | 4 | 8 |
| 2.4 | 2330 x 3005 | 4 | 3150 | 60 x 60 | 5 | 10 |
| 3.0 | 2930 x 2445 | 5 | 3900 | 60 x 60 | 6 | 12 |
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Unlike many commercial fencing contractors who only provide the manufacturer’s warranty for materials, we also cover our installation.
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