Highway noise barriers are vertical acoustic structures installed alongside roads to reduce traffic noise reaching nearby residential, commercial, and institutional areas. The 3.0m height is the standard specification for most ทางหลวง noise mitigation projects — balancing noise reduction performance, structural requirements, and cost.
## Acoustic Design
The barrier panel uses a composite sound-absorbing การก่อสร้าง:
- **Traffic-Side Face**: 0.8mm perforated galvanized steel — allows sound waves to enter the panel
- **Core**: 50mm mineral wool insulation (80 kg/m3) — absorbs sound energy by friction
- **Roadside Face**: 0.6mm solid galvanized steel — blocks residual sound transmission
- **Frame**: 1.5mm galvanized steel edge channel — structural integrity and weather seal
## Noise Reduction Performance
- **Insertion Loss (IL)**: 10-15 dB(A) at receiver behind barrier (typical)
- **Transmission Loss (TL)**: 32 dB (STC 32)
- **NRC**: 0.85 (absorbs 85% of incident sound)
- **Frequency Range**: Effective 100-5000 Hz (covers traffic noise spectrum)
The barrier creates an acoustic shadow zone. Noise reduction depends on:
1. Barrier height relative to source and receiver (diffraction angle)
2. Distance from road to barrier
3. Distance from barrier to receiver
4. Ground absorption between barrier and receiver
## Key Advantages
- **Effective Noise Reduction**: 10-15 dB(A) — reduces perceived loudness by 50-70%
- **Weatherproof**: ชุบสังกะสี steel + moisture-resistant mineral wool. 15+ year outdoor life.
- **Modular Design**: Standard panel 2.0m x 0.5m. Any length/height achievable.
- **Quick Installation**: แผงs slide into H-section posts. 100m installed in 2-3 days.
- **Aesthetic Options**: Powder-coated colors to match environment. Printed graphics available.
- **Fire Resistant**: A1 non-combustible. Meets all ทางหลวง fire codes.
- **Low Maintenance**: ชุบสังกะสี surface. No painting for 15+ years. Damaged panels individually replaceable.
## Technical Specifications
| Parameter | Value |
|-----------|-------|
| แผง Height | 3.0m |
| แผง Width | 0.5m (standard) |
| แผง Thickness | 100mm |
| Outer Skin | 0.8mm perforated galvanized steel |
| Core | 50mm mineral wool, 80 kg/m3 |
| Inner Skin | 0.6mm solid galvanized steel |
| NRC | 0.85 |
| STC | 32 |
| Insertion Loss | 10-15 dB(A) |
| Fire Rating | A1 (non-combustible) |
| Post Type | H-section steel 100x100x6x8 |
| Post Spacing | 2.0m |
| Wind Load | 0.8 kPa design |
| Zinc Coating | >=120g/m2|
| Standard | GB/T 19889, ISO 717 |
## Applications
- **Highways & Expressways**: Traffic noise reduction for adjacent communities
- **Urban Arterial Roads**: Dense residential and commercial corridors
- **Interchanges & Ramps**: Grade-separated intersection noise mitigation
- **Toll Plazas**: Stationary vehicle and horn noise control
- **Service Roads**: Frontage road noise barriers
- **Bus Rapid Transit (BRT)**: Dedicated bus lane noise reduction
- **Schools & Hospitals**: Sensitive receptor protection along roads
## Packaging & Delivery
- **Packaging**: แผงs palletized (20/pallet). Posts bundled. Hardware in cartons.
- **Container Loading**: 20ft GP ~ 200-400 m2; 40ft HQ ~ 400-800 m2
- **Lead Time**: 10-20 days standard; 20-30 days custom
- **Shipping**: FOB Tianjin / CIF / DDP