Technical specifications

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

 

 

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

Utilisation
Water/ Sewerage
Type
Cooling water tunnel
Length
4 * 300 m
Construction Method
Pipe Jacking
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