| 摘要 |
PROBLEM TO BE SOLVED: To provide an FRP cylindrical form with high tensile and compression strength consisting of a tapered part which tapers off to one of the ends of a cylinder and a large diameter part which is connected to the tapered part, provided on the end of the FRP cylindrical form in such a manner that the large diameter parts is arranged within a specific range in the cylindrical shaft direction, and further, a reinforcing fiber layer containing reinforcing fiber which accounts for a specific percentage of the total reinforcing fiber volume and another reinforcing fiber layer arranged outside the former reinforcing fiber layer. SOLUTION: The pipe center part 6 of an FRP cylindrical form 1 consists of a reinforcing fiber layer 3 and a reinforcing fiber layer 4, and a reinforcing fiber layer 5 containing reinforcing fiber arranged within an area of±30 to±55 deg. with a pipe shaft direction, is interposed between the reinforcing fiber layers 3, 4. In addition, on account of the formation of the reinforcing fiber layer 5, a tapered part 7 which tapers off to the end of the pipe from the pipe center part 6, enlarging the diameter is formed the pipe end part, and a large diameter part 8 which extends in the form of a straight pipe from the tapered part 7 to the pipe end is formed. Besides, the percentage of the reinforcing fiber container in the reinforcing fiber layer 5 of the large diameter part 8 is adjusted to the range of 25-50% of the total reinforcing fiber volume. |
