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Ventilation system for undersea tunnel

Photograph: Ventilation system for undersea tunnel

The largest tunnel ventilation equipment in Japan is installed in an undersea tunnel about 10-km deep on Trans Tokyo Bay Expressway.

Key specifications

1. Vertical axial-flow exhaust fan (largest class in Japan)

  • Impeller diameter: 4,000 mm (x 4)
  • Motor output: 765 kW (x 2)
  • Motor output: 315 kW (x 2)

2. Vertical asialflow ventilator (largest class in Japan)

  • Impeller diameter: 4,000 mm (x 4)
  • Motor output: 690 kW (x 2)
  • Motor output: 635 kW (x 2)

3. Booster fan

  • Impeller fan diameter: 1,530 mm (x 38)
  • Motor fan output: 50 kW

Image: Ventilation system diagram

Ventilation plant integrated with Kaihin Park

Photograph: Ventilation system for undersea tunnel

This is a ventilation plant for the Niigata Port Road tunnel in Kawaguchi, Shinanogawa, city of Niigawa, for which many measures were taken in consideration of the surrounding scenery and environment.

Key specifications

Vertical axial-flow exhaust fan

  • Impeller diameter: 3,550 mm (x 3)
  • Motor output: 115 kW

An underground ventilation plant that takes the space above ground into consideration

Photograph: Underground ventilation plant that takes the space above ground into consideration

This is ventilation equipment for a road that passes underground under Hokkaido University (city of Sapporo). A dust collection device and a soundproofing device have been installed underground in consideration of the environment above ground.

Key specifications

Horizontal axial-flow exhaust fan

  • Impeller diameter: 3,350 mm (x 4)
  • Motor output: 430 kW

Cross-section diagram of the underground ventilation plant

  1. Exhaust duct
  2. Dust removal device
  3. Exhaust fan
  4. Soundproofing device
  5. Corner blade
  6. Exhaust tower

Image: Exhaust fan

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