Method for forming of a tubular semi-finished product from fibre-reinforced plastic material

A method for producing a profiled semi-finished plastic product from flexible web material, comprising:

• providing a plurality of webs of flexible material;
• continuously and simultaneously feeding the webs of material to and along a plurality of shaping pieces arranged next to each other, preferably having greatest transverse dimensions which are smaller than the width of a web of material;
• folding each web of material around a respective shaping piece to form a body and an edge strip which projects transversely with respect to the body;
• causing the edge strips of different webs of material to at least partly cover each other;
• impregnating the provided webs of flexible material or the assembly of webs of material with folded-over edge strips covering each other with a hardenable means;
• causing the hardenable means to harden to form the profiled semi-finished plastic product, in such a manner that hollow or open spaces remain, each defined between two neighbouring bodies and edge strips in the formed profiled semi-finished plastic product.