Method for assembling very long parts of sheet metal girders for the legs of an oilplatform

An assembly process for long sections of the support leg struts of an oil platform is claimed, each section comprising a rectangular plate (12), with toothed edges (14) forming a toothed rack, and a counter-brace (13) of half-shell form fixed on each main face (12a, b) of the plate The process compr...

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Bibliographische Detailangaben
Hauptverfasser:	THOMAS, PIERRE ARMAND, NAUDIN, JEAN-CLAUDE
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING COMBINED OPERATIONS CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS FOUNDATIONS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HYDRAULIC ENGINEERING MACHINE TOOLS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY METALLURGY OF IRON MINING MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS OTHER WORKING OF METAL PERFORMING OPERATIONS SOIL SHIFTING SOLDERING OR UNSOLDERING TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TRANSPORTING UNIVERSAL MACHINE TOOLS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	An assembly process for long sections of the support leg struts of an oil platform is claimed, each section comprising a rectangular plate (12), with toothed edges (14) forming a toothed rack, and a counter-brace (13) of half-shell form fixed on each main face (12a, b) of the plate The process comprises (a) machining a flat (15) along each main face of the plate on each side of its longitudinal axis, each flat (15) being inclined towards this axis and being spaced from the axis by a distance corresponding to the radius of the counter-brace (13); (b) machining a groove (16) along the plate and between each flat (15) and the axis; (c) machining a bevel (17) on the counter-brace longitudinal edges, the bevel being inclined towards the counter-brace axis at the same angle as the inclination of the corresponding flat (15); (d) positioning the counter-braces (13) on the plate (12) such that the bevelled edges rest on the flats; (e) electron beam welding the edges to the flats under external vacuum to form a strut section; and (f) heat treating the section.