Method for manufacturing root segment sections for a root segment of a turbine blade, method for manufacturing the root segment and method for manufacturing the turbine blade

A method for manufacturing a turbine blade, comprising the steps of:

• (a) manufacturing a root segment of the turbine blade by
• manufacturing multiple tapered root segment sections for the root segment of the turbine blade, wherein each tapered root segment section of the tapered root segment sections forms a portion of a circumference of the root segment, wherein manufacturing multiple tapered root segment sections includes winding multiple layers of a fabric around a winding core in a way such that a multilayered structure from the fabric having a shape tapered transverse to a direction of the winding is obtained;
• applying adhesive to the fabric;
• curing the adhesive applied to the fabric of the multilayered structure wound around the winding core, so that a cured multilayered structure is obtained;
• separating the cured multilayered structure from the winding core;
• and cutting the cured multilayered structure into the multiple tapered root segment sections in a direction transverse to a circumference of the cured multilayered structure,
• arranging the multiple tapered root segment sections in a round shape, and
• casting the arranged multiple tapered root segment sections to obtain the root segment wherein a distance is provided between adjacent root segment sections;
• (b) arranging multiple layers of fabric on an outer side and an inner side of the root segment and connecting them to a portion of the turbine blade, and
• (c) casting the multiple layers of fabric with the root segment and the portion of the turbine blade to obtain the turbine blade.