Assembling method of mandrel used for manufacturing composite material structure and assembling apparatus of mandrel

An assembling apparatus of a mandrel for use in assembling of a tubular mandrel by joining a plurality of segments together, the mandrel being supported by a pair of support rings facing each other, the segments having a substantially rectangular shape and being parts into which the mandrel is divided along a center axis direction, in which

• a plurality of fastening portions of the segments are set along a circumferential direction on each of the pair of support rings, the assembling apparatus comprising:
• a rail body inserted into a hollow space of the pair of support rings;
• a ring rotation drive section for rotating each of the support rings to position at an uppermost portion of each of the support rings a specified fastening portion which is one of the fastening portions set on the pair of support rings;
• a horizontal movement mechanism which is provided on the rail body and configured to horizontally move the segment from a rear end of the rail body toward a tip end of the rail body;
• and
• a vertical movement mechanism which is provided on the rail body and configured to lift up the segment moved from the horizontal movement mechanism to a height position corresponding to the specified fastening portion along the vertical direction, to fasten the segment to the specified fastening portion.