Waterproof lining in underground structures Alv Hanstvedt - - PowerPoint PPT Presentation

Waterproof lining in underground structures

Alv Hanstvedt

Technical Director

Hydrovision 2012, New Dehli

Content page:

• 1. Company
• 2. Products
• 3. Corrosion problem associated with

humidity in underground env.

• 4. Solutions to avoid humidity
• 5. Successful projects
• 6. Q/A

• Company

Main Office. Bergen, Norway

• W. Giertsen AS established in 1875

Main office Bergen

• We are involved in projects, world wide.
• International, our business is based on cooperation

with local contractors.

• Products

• WG Tunnel Arch
• WG Tunnel Sealing
• Based on more than

30 years experience.

• Most of our systems

and methods are all patented.

Rock downfall

Fire

• The fabric is self extinguishing in case of fire and

does not propagate the flames

• There is no after glow
• Fire documentation from Norway (NBL), Sweden

(SITAC/SP) and Finland (VTT)

• New fabric solution is made in cooperation with

the Norwegian Road Departement

Full-scale fire test

25 MW fire, comparable with five fully-burning cars Result: No flash-over!

• Corrosion

Problems

Humidity = Corrosion

Alternative method ????

• Solutions to avoid

humidity

The relation between speed of corrosion and the relative humidity (RH)

20 40 60 80 100 120 40 50 60 70 80 90 100

% RF mg/dm2

High humidity increaces bacteria growth

By keeping the relative humidity below 50%RH, the bacteria growth is reduced significantly.

• Successful

projects

Protecting values

Powerhouse

Dale Kraftverk - BKK

Powerhouse

Transformer room

Transformer tunnel

WG Tunnel Sealing

Access tunnel, defense Submarine maintenance Storage, defense Storage, defense

Access aera

Roundabout in rock

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