Method and system for tensioning a hyperstatic system

A system for tensioning a hyperstatic system comprising two structures connected to each other, the system comprising:

• at least one adjustable tendon formed by a tendon coupled to a cylinder;
• and
• at least one non-adjustable tendon to connect an upper structure resting on an upper support to a lower structure which is positioned below the upper structure and configured to rest on a fixed lower support formed by a seabed or by a fixed structure resting on the seabed;
• and
• means for applying a force to the upper structure and/or the lower structure to tension each non-adjustable tendon until tension of each non-adjustable tendon reaches a threshold value causing a load transfer from the lower structure to the upper structure;
• wherein the upper structure is configured to provide support for the lower structure, the lower structure being configured to be lifted from the fixed lower support and suspended by the upper structure at the load transfer.

A method for tensioning a hyperstatic system comprising two structures connected to each other, the method comprising:

• step a) connecting, by at least one non-adjustable tendon and at least one adjustable tendon, an upper structure resting on an upper support to a lower structure positioned below the upper structure while maintaining zero tension in the at least at least one adjustable tendon and the at least one non-adjustable tendon;
• step b) applying a force to the upper structure and/or the lower structure in order to tension each adjustable tendon and to deploy respective cylinder of each adjustable tendon, the tension of each non-adjustable tendon remaining at zero;
• and
• step c) progressively increasing the force on the upper structure and/or the lower structure until the tension of each non-adjustable tendon reaches a threshold value which brings about a load transfer from the lower structure to the upper structure so as to allow the lower structure to be supported by the upper structure;
• wherein the at least one adjustable tendon is formed by a tendon coupled to a cylinder in an initially retracted position.