Assembly for supporting at least one fluid transport pipe through an expanse of water, and associated facility and method

A submerged assembly for supporting at least one fluid transport pipe through an expanse of water, of the type comprising:

• a supporting buoy intended to be completely submerged in the expanse of water, the buoy being kept spaced away from the bed of the expanse of water under the effect of its own buoyancy, the buoy including at least one pipe bearing surface;
• at least one anchoring assembly comprising a base designed to be attached to the bed of the expanse of water;
• at least one flexible anchoring line connecting the anchoring assembly to the supporting buoy;
• the anchoring line comprising at least one lower section,
• wherein the anchoring assembly comprises:
• a guide for guiding the lower section, the lower section being movably mounted in the guide relative to the base, between an extended configuration, in which the height of the anchoring line protruding above the base is maximal, and a contracted configuration, in which the height of the anchoring line above the base is minimal;
• and
• a releasable locking member of the anchoring line on the anchoring assembly, the locking member being configured to maintain a desired height at the anchoring line between the contracted configuration and the extended configuration.