ITW: Fast Grouting Operations at Amrumbank

The connections between transition piece and monopile have been grouted with the ultrahigh performance cementitious based material Ducorit® and the installation completed by highly skilled supervisors.

For the Amrumbank project (80 connections) ITW delivered another turnkey grouting solution including Ducorit, their newly developed equipment and with the installation of the product performed by their own supervisors.

In 2014 the first 19 connections were grouted while the rest of the 61 connections were completed in the period 19^th April to 21th May, 2015 with an average of 2 grouting operations per day. 

The installation of the monopiles and transition pieces was performed from the jack-up crane vessel ‘MPI Discovery’ and the grouting part executed from Far Sapphire a DP2 grouting vessel equipped with an Ampelmann system. The execution of the foundation installation and the grouting operation from two separate vessels is still relatively uncommon, but ITW is experienced in this method of grouting.

 “We do not prefer one solution rather than the other but at this project it has really worked out well”, says Soren Munk, ITW Supervisor and he continues, “It has been a pleasure working on the Amrumbank project. The setup allowed us to work very intensively for a shorter period”.

ITW’s greatest strength – besides being able to deliver the ultrahigh performance grout – is that ITW deliver a turnkey grouting solution including for example; project management, planning, newly  developed equipment, highly skilled supervisors to perform the installation, as well as test sampling and documentation. This is probably one of the reasons why 70 % of all offshore wind turbines in Europe contain Ducorit grout as a crucial element.

Project details

Amrumbank West is a 288MW offshore wind farm being developed in the North Sea, Germany. The wind farm will include 80 Siemens SWT-3.6-120 wind turbines rated at 3.6MW each. The turbines will be installed over an area of 32km² in water depths ranging from 20m to 25m. It is located 35km north of Helgoland and 37km west of Amrum .

What is Ducorit®

Ducorit® is a pumpable, Ultra-High Performance Cementitious (UHPC) material especially developed for grouted structural connections. The core of the Ducorit® products is the unique Densit Binder, and the different properties of Ducorit® S1, Ducorit® S2, Ducorit® S5 and Ducorit® D4 are obtained by adding aggregates such as quartz sand or bauxite.

For more information, please contact:
Karina Hojgaard, Global Marketing Manager, ITW Wind Group, +45 40 17 71 04, khojgaard@itwwind.com