| 摘要 |
A method of manufacturing a protective sheath made of laminated material based on fibers impregnated with resin, the method making use of a cylindrical draping mandrel, wherein: at least two longitudinal elements are provided on the mandrel to project from the periphery thereof, which elements are disposed substantially along diametrically opposite generator lines of the mandrel, dividing the mandrel into two longitudinal semicylindrical portions; a first sheet of flexible laminated material is placed on one of the semicylindrical portions of the mandrel, with the longitudinal margins of the sheet overlying the longitudinal elements; a second sheet of flexible laminated material is placed on the other semicylindrical portion, with the longitudinal margins thereof overlying the longitudinal margins of the first sheet and the projecting longitudinal elements; the first and second sheets are pressed against the outside surfaces of the semicylindrical portions by means of a pressure difference; both sheets are hardened, thereby defining two semicylindrical half-shells which are interfitted in each other along their respective longitudinal margins, which margins fit over the profile of the elements and form external longitudinal swellings; and the two half-shells are removed from the mandrel.
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