Patent ID: RE43692

Claim:
A method of manufacturing a blade root of wind turbine blade, having a plurality of fully bonded insert bushings having a longitudinal hole with internal thread for mounting bolts for releasable attachment to a hub of a wind turbine, the method comprising the steps of: providing an a segmented annular holder having a plurality of spaced recesses provided in an inner circumferential surface of the holder; lining the inner circumferential surface of each segment of the holder with a first fibre mat layer such that said first fibre mat layer is at least partially received in the recesses; respectively placing the plurality of insert bushings in said recesses such that said bushings contact the first fibre mat layer and extend substantially in the longitudinal direction of the blade; providing an additional fibre mat layer over the insert bushings such that the insert bushing are substantially encased between the first fibre mat layer on an outer radial side of the insert bushings and the additional fibre mat layer on an inner radial side of the insert bushings; and consolidating the fibre mat layers.