Tunnels - Wayss & Freytag Ingenieurbau AG

New Central Services Tunnel for Brunsbüttel Lock
Germany
General Data:
Project: New central services tunnel for Brunsbüttel lock, tunnel for service lines
Client: Wasser- und Schifffahrtsamt Brunsbüttel [Water and Shipping Authority]
Contractor: Wayss & Freytag Ingenieurbau AG
Construction period: March 2009 to September 2011
Construction costs: € 22 million
Technical Data:
Scope of work: Construction of a services tunnel (called “Mitteldüker”) under the existing double
locks at the western end of the Kiel Canal without disrupting lock operations,
length: approx. 450 m, clear internal diameter: 2.20 m, tunnel invert approx. 35 m
below ground level
Construction method: Pipe jacking using an AVN 2000 machine,
construction of shafts using the diaphragm wall method
Geology: Gravelly sand with stones
New Coal-Fired Power Plant in Wilhelmshaven,
Cooling Water Pipelines, Lot C121, Germany
General Data:
Project: New coal-fired power plant in Wilhelmshaven,
cooling water pipelines, Lot C121
Client: GDF SUEZ Energie Deutschland AG
Contractor: Wayss & Freytag Ingenieurbau AG
in a joint venture
Construction period: December 2009 - August 2011
Construction costs: € 36 million
Technical Data:
Scope of work: 4 cooling water pipelines DN 3400 with a length of 300 m each;
1 fish return pipeline DN 1200 with a length of 300 m;
start shaft: 30 m x 25 m x 15 m, diaphragm walls with anchored underwater concrete slab;
target shaft: 45 m x 11 m x 15 m, steel girder shoring with underwater concrete slab and pre-installed lean
concrete block;
dyke crossing structure: 5 circular cells of secant bored piles (internal diameter approx. 7 m), a tunnel drive
through each circular cell
Construction method: Pipe jacking using 2 slurry-supported tunnel boring machines, external diameter: 4.1 m
Jacking pipes:
Composite pipes DN 3400, consisting of a reinforced concrete pipe with an integrated HDPE pipe liner
Geology: Silty sand with bands of clay
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