Abstract: A monopile fastening system (1, 9, 17) for retaining one or more elongated monopile during sea transport and/or quay transport, the system comprising: —at least two supporting devices (3, 11, 18); —a supporting frame (2, 10, 23) for securing the at least two supporting devices to a surface of a vessel, barge or a sea transport unit, the at least two supporting devices having each at least one surface (6, 32) in contact with a surface (7, 33) of the supporting frame; wherein each of the at least two supporting devices comprises, at least two supporting elements (4, 5, 12, 13, 20, 24, 27), the supporting elements having each at least one surface (14, 15, 25, 26, 28, 29) in contact with each other; wherein the at least two supporting elements are connected with each other through one or more displacing means (16, 22, 30); and wherein the one or more displacing means are means for displacing the at least two supporting elements along the at least one surface in contact with each other.

Abstract: The present invention relates to a monopile fastening system for retaining one or more elongated monopile during sea transport and/or quay transport, which can be used to accommodate monopiles with section having different diameters by the combination of complementary supporting elements that can be singularly activated. The present invention also relates to a monopile fastening structure comprising a plurality of monopile fastening systems, and to a vessel, a barge or a sea transport unit comprising a monopile fastening structure or a monopile fastening system and to a method for fastening a monopile using a monopile fastening system.