Wijkertunnel

The tunnel is part of the new A9 motorway situated 1200 m east of the existing Velsertunnel, where it crosses the Noordzeekanaal.

Project description

This motorway tunnel has two tubes each comprising three lanes and a central duct. The tunnel and the approaches, wide 30 m, long 1100 m has been designed for the transportation of hazardous goods, category I standards. The submerged part of the tunnel consists of 6 elements each 96 m long. The elements have been constructed in a casting basin at Barendrecht and then transported via the North Sea to the Noordzeekanaal. Both approaches consists of three 20 m long tunnelsections and five open through sections. These reinforced concrete structures have been constructed by means of the cut and cover method. The upper part of the approaches, some 500 m, are so called "green" approaches with soil-ballasted watertight PVC membranes.

Scope of work

Overall:

To represent the employer during construction and to carry out site supervision and contract administration for the tunnel works construction and installations.
Probabilistic analyses concerning the seatransportation transportation of the tunnelelements.
Review of contractors detailed engineering.

Civil and Structural works:

Design responsibility, to update and optimise the draft tender documents and drawings.
Detailed design and all construction and reinforcement drawings.

Mechanical and Electrical:

To prepare a conceptual design followed by tender documents.
To produce Terms of References, to control and check the contractors detailed design and to carry out the site supervision.

Download the specification sheet