singapore metal noise barrier
In Singapore, metal noise barriers are commonly used for highways, expressways, and construction sites due to their durability, acoustic effectiveness, and adherence to stringent safety and environmental standards set by the Land Transport Authority (LTA) and the National Environment Agency (NEA). Here are typical sizes and specifications for metal noise barriers in Singapore:
1. Barrier Dimensions
Height: Metal noise barriers typically range between 3 and 6 meters in height, depending on location and required noise attenuation. Higher barriers, up to 10 meters, may be used near sensitive areas.
Thickness: Metal barriers generally have a 10 to 15 cm thickness, allowing for both structural integrity and effective sound absorption layers.
2. Acoustic Performance
Noise Reduction Level (Transmission Loss): Metal barriers in Singapore aim for a noise reduction level of around 25–35 dB to sufficiently reduce traffic and construction noise for nearby residential areas.
Noise Absorption Coefficient (NRC): High-performance metal noise barriers typically have an NRC of 0.8 to 1.0, meaning they absorb rather than reflect most sound energy.
3. Material and Construction
Core Construction: These barriers are made from perforated metal sheets (aluminum, galvanized steel, or stainless steel) which are highly durable and weather-resistant.
Acoustic Insulation Material: The core of the barrier typically contains mineral wool or fiberglass, which are excellent at sound absorption and are non-combustible. The inner insulation layer is designed to optimize sound absorption, while the perforated exterior allows sound waves to penetrate and be absorbed.
Surface Coating: Metal barriers are often coated with anti-corrosion and anti-graffiti layers, ensuring long-lasting durability in Singapore’s humid and rainy climate.
4. Structural Requirements
Wind Load Resistance: Metal barriers are engineered to withstand high wind loads, meeting or exceeding international standards for wind resistance, especially important along elevated expressways.
Vibration Resistance: They are constructed to absorb and dissipate vibrations, reducing the impact of road vibrations on structural integrity over time.
5. Safety and Environmental Standards
Fire Resistance: Metal barriers are generally fire-retardant or made of fire-resistant materials to prevent hazards.
Impact Resistance: These barriers are built to be impact-resistant to ensure public safety in case of accidents or falling debris.