ArcelorMittalApplicationsCase studiesMidtermolen Project | Port of Copenhagen | DK

Midtermolen Project | Port of Copenhagen | DK

The central pier of the "Frihavnen" in the Port of Copenhagen (DK) has been reconstructed to offer around 51 000 m2 space for administration companies and businesses, as well as private housing.

To construct the foundations with basements and underground car parking, the old pier was surrounded with a steel sheet pile wall. This deep cofferdam retained the harbour water and permitted construction of the new foundations in the dry.

During the construction, the sheet piles were braced against the existing pier. To guarantee the impermeability of the cofferdam, the sheet pile interlocks were filled with an inexpensive hydrocarbon product that was easy to handle.

The steel sheet piles were installed with a vibrohammer ICE 223, which had an additional weight of 2 tonnes, to permit easier penetration in the sandy harbour ground. In a daily shift of 14 hours, the contractor was able to install up to a maximum of 50 double sheet piles of AZ 13 and AZ 18 (around 12 m long), the AZ 13 having the exceptional width of 1.34 m. The installation was completed in a record time of 4 months.

Once the foundation was complete, the space between the sheet piles was in filled. The sheet piles were then tied back to the pier and the struts were removed. In this way, the temporary cofferdam that served the first phase of construction has been transformed into a new permanent quay wall structure. Thus, the sheet piles met the economic double function of a temporary and permanent structure.

 
Project owner
East Asiatic Company DK - PFA - C.G. Jensen A/S | DK
Consulting engineer
Carl Bro A/S - Dansk Geoteknik A/S | DK
Architect
PLH Arkitekter A/S - Svend Kierkegaard APS | DK
Main contractor
C.G. Jensen A/S | DK
Steel sheet piles
AZ 13 | PAE 250 | variable lengths (up to 12.0 m)
AZ 18 | PAE 360 | variable lengths (up to 12.0 m)
Quantity
2 000 t
First published: 1995 (TESPA)
Latest revision: 01/2019
Last modified: January 10, 2019