| 摘要 |
<p>PROBLEM TO BE SOLVED: To arrange a balance adjusting material on a pipe main body without winding it into a fiber reinforcing material, to arrange the balance adjusting material even when the thickness of the pipe main body is thin and to prevent the fiber reinforcing material from being protruded on the surface of the pipe main body when a tapered FRP pipe material wherein the balance adjusting material is arranged on a part in the axial direction is prepd. SOLUTION: A cut part 4 wherein the apex 8 of the bottom face 6 is connected to the outer peripheral face 10 of a mandrel 2 and the bottom face 6 is in parallel with the central axial line 12 of the mandrel 2 or is inclined so as to become close to the central axial line 12 as it moves toward the apex side, is formed along the peripheral direction. In addition, a balance adjusting material is filled in the cut part 4 to make the mandrel after being filled a smooth tapered shape and furthermore, after a prepreg for forming a pipe main body is wound on the mandrel, the prepreg is cured by heating. A pipe material wherein the balance adjusting material is sticked on the inner wall of the pipe main body is obtd. thereby.</p> |
