Linjebygg AS has performed casting, inspection and repair work of offshore concrete structures since mid 1990ties. Combining rope access technique (RAT) with various temporary working platforms gives a very cost-effective access to the whole structure compared to using scaffolding. We have a pool of 25 skilled workers performing various offshore projects, and two senior engineers supporting the projects from back office. Linjebygg has more than ten operators with RPK2 certificate of competence, and one engineer with RPK3.
On offshore concrete structures chloride attack is the most common degradation mechanism. Linjebygg does close visual inspection, cover measurements, electro chemical potential mapping (ECP), delamination control, Schmidt rebound hammer test, Rapid Chloride Test (RCT) and core samples. Every damage is documented with a unique identification, pictures, location and description. In that way we can follow and document a damage from it was discovered, through the development phase, repair and into the future after the repair.
Linjebygg uses mostly water jetting to remove damaged and chloride infected concrete. In narrow spaces we use hand lance. For larger surfaces we have developed our own remote operated jet frames which can be used on plane, convex and concave surfaces. The frame comes in different sizes.
The repair method is either dry spraying, formwork and casting, manual repair, injection or surface treatment. One or more of these methods is chosen for each project based on quality and cost efficiency evaluation.
Linjebygg does casting of new structures, grouting and air void filling on offshore assets. We have the expertise for doing formwork, reinforcement, mixing and casting in house.