| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an elbow joint excellent in strength to high water pressure.SOLUTION: An elbow joint 100 has a bent pipe 200. A rib 300 extending in an axis Cw direction is provided at the inside corner part of the bent pipe part 200, and formed so as to be made thicker toward a base end from a tip. The cross section of the rib 300 vertical to the axis Cw direction of the bent pipe part 200 is preferably an isosceles trapezoid whose leg inclination is beyond 10° with respect to a height direction. The bent pipe part 200 contains fiber-reinforced plastic.</p> |
