Trianel is looking for contractor for the performance of diving works including provision of a suitable vessel.
During the installation of the foundation tripods onto the pre-installed piles a number of grout seals were ‘ripped out’.The function of the grout seals is to contain the grout within the sleeve annulus. Without a grout seal the sleeve annulus cannot be grouted.
There are 7 tripod sleeves which are affected. Repair clamps have been designed and fabricated and when installed will close off the bottom of the sleeve annulus to allow it to be grouted. 7 repair clamps need to be installed around the pile just below the bottom of the sleeve by divers.
Currently a diving company is undertaking the installation of the repair clamps.
So far 2 clamps have been installed. Further progress of the work depends on the weather conditions. Thus, the Scope of Works for this tender could be between 1 and 5 clamps depending on progress.
On each of the remaining affected sleeves the scope of work shall include the following:
1. Removal and recovery of the Tripod sleeve pile guide plates;
2. Removal of all marine growth from both the outside surface of the pile and the inside surface of the Tripod sleeve. The area to be cleaned extends from the bottom of the Tripod sleeve to the top of the pile. This height is approximately 5m;
3. Removal of the damaged grout seal from the pile – sleeve annulus;
4. Installation of the repair clamp.
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Offshore WIND staff, May 10, 2013; Image: