| 摘要 |
A bar-like molding made of fiber-reinforced plastic materials of the type which can be extended by connecting pieces thereof, comprises a fiber-reinforced plastic covering layer (2, 3) formed by laminating a plurality of fiber-reinforced plastic layers and short length metal pipes (4, 6) for connection arranged at the ends of the fiber-reinforced plastic covering layer, the fiber-reinforced plastic covering layer including an inner fiber-reinforced plastic covering layer composed of a plurality of fiber-reinforced plastic layers (2a, 2b) and abutting at its ends against the respective inner end surfaces of the short length metal pipes for connection, and an outer fiber-reinforced plastic covering layer composed of a plurality of fiber-reinforced plastic layers (3a, 3b, 3c) and formed in such a manner as to cover the outer peripheries of said inner fiber-reinforced plastic covering layer and the short length metal pipes for connection, the re-inforcing fibers of at least one of the plurality of fiber-reinforced plastic layers of at least one of the outer reinforced plastic covering layer and the inner reinforced plastic covering layer being arranged in the axial direction of the bar-like molding. Preferably, at least the outermost layer of the outer fiber-reinforced plastic covering layer is formed as a layer whose reinforcing fibers are arranged 90 DEG to the axial direction. |
