a device and a method for locally repairing or reinforcing an elongate body , said device being intended for winding one or a plurality of layers of pre - impregnated polymerizable strip around the elongate body , said device comprising : — releasable means of attachment around the elongate body , — means for the rotational movement of support structure around the means of attachment , — means for the longitudinal movement of a spool of a pre - impregnated polymerizable strip relative to the support structure , said support comprising means for limiting the movement of the spool to a predetermined path , said spool being unwindable when it is subjected to a given tension , — means for bringing the spool into rotational and translational movement around the elongate body , causing the pre - impregnated polymerizable strip to be wound around said body .