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Submerged Tunnel GK Project

South Korea

The formwork system for the construction of one of the deepest tunnels in the world has been supplied by Doka. The tunnel connects the City of Busan to the island of Geoje by a 3.0 km long and 60 m deep immersed tunnel. 4 tunnel segments each with a length of 180 m were simultaneously manufactured in a dry dock. After completion and flooding the dry dock the segments were transported by tugboats into position and immersed to its final location.

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Project data

Year of completion
2010
Project duration
36 Months
Country
South Korea
Address
Busan-Geoje Fixed Link
Town or city
Busan
Contractors
Daewoo E & C
Structure
Tunnel
Type of structure
Cut-and-cover tunnel

Wall

Construction method
Monolithic
Cross-sectional shape
Rectangular
Clear width
10,07 m
Clear height
7,29 m
Formed length of tunnel
3000 m
Length of concreting section
22,5 m
Number of casting sections
144