Bridge and viaduct noise barriers are specialized acoustic structures designed for the unique structural and environmental conditions of elevated transportation infrastructure. Unlike ground-mounted barriers, สะพาน barriers must handle สะพาน vibration, wind exposure, weight limitations, and aesthetic requirements.
## Bridge-Specific Challenges
- **Bridge Vibration**: Traffic-induced vibration cycles (2-10 Hz) fatigue barrier connections. Requires flexible mounting.
- **Weight Limitation**: Bridge decks have strict dead-load limits. Barriers must be lightweight.
- **Wind Exposure**: Bridges are elevated — higher wind speeds and turbulence. Wind load 1.5-2.0 kPa.
- **Aesthetic Requirements**: Bridges are visible landmarks. Transparent or architectural finishes often required.
- **Corrosive Environment**: River-crossing สะพานs expose barriers to humid, salty air. Requires enhanced corrosion protection.
- **Maintenance Access**: Bridge barriers harder to access. Must be more durable and easier to replace.
## Design Solutions
### Transparent แผงดูดซับเสียงs
- **Material**: 15mm solid polycarbonate (PC) or 10+10mm laminated glass
- **Transparency**: 89% light transmission (PC), 91% (glass)
- **Acoustic**: STC 30 (PC), STC 33 (glass). Lower than steel panels but acceptable for สะพาน use.
- **UV Resistant**: PC has UV coating — 15-year clarity guarantee
- **Impact Resistant**: PC is 200x more impact-resistant than glass
- **Weight**: PC ~3 kg/m2 — significantly lighter than steel panel (25 kg/m2)
### Hybrid Design
- **Lower Section** (0-1.5m): Sound-absorbing steel panel (absorbs tire/road noise)
- **Upper Section** (1.5-3.0m): Transparent PC panel (preserves view)
- **Benefits**: Acoustic performance + visual transparency + reduced weight
## Key Advantages
- **Bridge-Optimized**: น้ำหนักเบา design respects สะพาน load limits.
- **Wind Engineering**: Aerodynamic profile and enhanced anchoring for สะพาน wind loads.
- **Vibration-Fatigue Resistant**: Flexible connections with rubber isolation — withstands 2 million vibration cycles.
- **Transparent Option**: 89% light transmission — preserves สะพาน views and driver sightlines.
- **Corrosion-Resistant**: Zn-Al coating + optional additional coating for ชายฝั่ง/river สะพานs.
- **Aesthetic**: Architectural finishes available. Hidden fasteners. Custom colors.
## Technical Specifications
| Parameter | Value |
|-----------|-------|
| แผง Height | 2.0m, 2.5m, 3.0m |
| แผง Width | 1.0-2.0m (transparent) / 0.5m (steel) |
| Steel แผง | 100mm composite, NRC 0.85, STC 32 |
| Transparent แผง | 15mm PC, STC 30, 89% transmission |
| Glass Option | 10+10mm laminated, STC 33, 91% transmission |
| Mount Type | Rubber-isolated, vibration-fatigue rated |
| Post Type | H-section steel, สะพาน-rated |
| Wind Load | 1.5-2.0 kPa (สะพาน design) |
| Vibration Cycles | 2 million (fatigue design) |
| Corrosion Protection | Zn-5%Al >=150g/m2+ optional coating |
| Fire Rating | A1 (steel) / B1 (PC) |
| Standard | GB/T 19889, ISO 717, JTG/T D81 |
## Applications
- **Urban Viaducts**: Elevated roads through dense urban areas
- **Highway Bridges**: River and valley crossings near communities
- **River-Crossing Bridges**: Urban สะพานs over waterways
- **Interchange Ramps**: Elevated flyovers at ทางหลวง junctions
- **Elevated Expressways**: Urban elevated road corridors
- **Pedestrian Bridges**: Noise reduction for สะพานs near residential
- **Coastal Bridges**: Salt-air resistant barrier systems
## Packaging & Delivery
- **Packaging**: Steel panels palletized. PC panels in wooden crates (fragile). Posts bundled.
- **Container Loading**: 20ft GP ~ 150-300m; 40ft HQ ~ 300-600m
- **Lead Time**: 15-25 days standard; 25-40 days custom/laminated glass
- **Shipping**: FOB Tianjin / CIF / DDP