The invention relates to a method of constructing and launching an offshore semi-submersible platform (1), which comprises the following operating steps: a) making said semi-submersible platform (1) in a dry environment by dividing it into a plurality of sub-assemblies (11, 12, 13) each of which comprises at least one of the floating columns (110, 120, 130) and at least one semi-arm (111a; 111b; 121a; 121b; 131a; 131b) of a respective lower structural connection arm (111; 121; 131), which semi-arm is already structurally integrated in the column itself and extends cantilevered therefrom with a respective free end; b) providing each sub-assembly in a dry environment with at least one temporary thrust box (101, 102; 201, 202; 301, 302), which is positioned below said at least one semi-arm and is provided with a housing seat of the respective semi-arm and at least one ballast chamber; c) separately launching in water the individual sub-assemblies (11, 12, 13) which float independently by virtue of the respective floating column; d) adjusting for each sub-assembly the ballast of the respective temporary thrust box so as to obtain a balanced floatation of the sub-assembly which allows the free end of said at least one semi-arm to be positioned at the same height as the free end of the semi-arm of the sub-assembly intended to take an adjacent position; e) bringing the sub-assemblies at the free ends of the respective semi-arms close to each other two-by-two until they are aligned, with the aid of axial alignment means (400) previously arranged at the free ends of the semi-arms; f) connecting the temporary thrust boxes to each other two-by-two, preferably creating a watertight chamber at the junction zone between the free ends of the respective two semi-arms; g) welding the free ends of the semi-arms together so as to create a structural connection between the columns, wherein, preferably, said welding step is conducted in a dry environment despite being below the water level by virtue of said watertight chamber; h) removing the temporary thrust boxes.


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    Title :

    METHOD OF CONSTRUCTING AND LAUNCHING AN OFFSHORE SEMI-SUBMERSIBLE PLATFORM AND AN OFFSHORE SEMI-SUBMERSIBLE PLATFORM THUS CONSTRUCTED


    Additional title:

    VERFAHREN ZUM BAUEN UND STARTEN EINER HALBTAUCHENDEN OFFSHORE-PLATTFORM UND SO GEBAUTE HALBTAUCHENDE OFFSHORE-PLATTFORM
    PROCÉDÉ DE CONSTRUCTION ET DE LANCEMENT D'UNE PLATE-FORME SEMI-SUBMERSIBLE OFFSHORE ET PLATE-FORME SEMI-SUBMERSIBLE OFFSHORE AINSI CONSTRUITE


    Contributors:

    Publication date :

    2024-05-29


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS



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