1. Major Application Cases

Areas requiring multi-functional tunnels

prevent avalanche and excessive snow pile
maintain the continuity of tunnels
secure safe road conditions near the cutting area of the tunnel
provide a protective area at tunnel ends to better adapt to sudden brightness
serve as an environmental facility
build temporary tunnel to secure construction efficiency under frequent severe weather

Areas with residential complaints of noise pollution

Residential and/or school areas near roads and railways suffering from insidious noise pollution
Areas with a high number of serious resident complaints against urban rail and car noise

2. Sound Proof Tunnels in Korea

Name Location Construction Completion Date Section Shape Specifications E-W Elevated Road Noise Proof Tunnel Busan West-East City Freeway 1993 Slanted Roof Width : 9.8m Height : 4.5m Length : 202m Pyungchon Viaduct Noise Proof Tunnel Seoul Outer Motorway Pyungchon Viaduct Ramp 1996 Arch Roof Width : 8.9m Height : 6.1m Length : 634m E-W Elevated Bridge  Noise Proof Tunnel Chunahn E-W Road 1998 Slanted Roof Width : 17.3m Height : 5.7m Length : 120m Dangsan Steel Bridge Noise Proof Tunnel Dangsan Steel Bridge 1999 Quadrilateral Width : 10.6m Height : 8.8m Kaya Elevated Road Noise Proof Tunnel Busan Kaegeum-dong in progress Arch Roof Width : 20.1m Height : 6.7m Length : 568m Gaewha Tunnel Seoul 2000 Arch roof Length :152m Gwangju Beltway No.2 Gwangju 2000 Slanted roof Length: 611m

3. Application Examples

For tunnel ends (to prevent avalanche and land slide, to effectively adjust to sudden brightness, to secure safe driving conditions) For the prevention of falling stones or avalanche when cutting For the maintenance of continuous tunnel (to secure safe road conditions)

4. Consideration Items for Soundproof Tunnels

Soundproof tunnel makes more use of the noise absorption effect than the sound reflection effect. The major noise  trapping factor applied in soundproof tunnel is the reduction of  transmission coefficient of noise reduction materials. Interior lighting system Outside painting to blend well with the background Ventilation -Drainage system inside the tunnel -Aesthetic and environmental appeal -Maintenance and repair Natural light