| 摘要 |
PURPOSE: A spiral pipe of high strength for a drainage pipe is provided to reinforce external earth pressure and durability, reduce the cost, and simplify the manufacturing process by integrally forming an auxiliary hollow unit to a support rod and to an adhesion rod. CONSTITUTION: An extrusion tube(26'), extruded according to a cooling pipe(51) assembled to a dice of an extruder, is spirally turned by the rotation of a forming roller(10) of a spiral pipe-forming machine with uniform width(e), to form a hollow protruded part. A reinforcing tube(42') extruded from a dice is integrated with an adhesion rod(44) of the extrusion tube by a compression roller(43). A reinforcing rod(42) is integrated with the adhesion rod and is cooled. An extrusion tape(45) is integrated with the upper surface and the side wall surfaces of a hollow reinforcing rod by an adhesion roller(46). A support rod(52) is formed by externally touching the extrusion tape with the middle upper side of the side wall surfaces and the upper surface of the hollow protruded part at an uneven groove part of the adhesion rod. The upper and lower surfaces of an auxiliary hollow unit(33) are integrated with the support rod and the adhesion rod by fusion rods(a,b), to reinforce the auxiliary hollow unit through a reinforcing rod.
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