| 摘要 |
<p>PURPOSE: To form a pipe-shaped body with high rigidity by spirally rolling a belt-shaped body of synthetic resins in parallel providing a plurality of projections with collars at one surface to a longitudinal direction and by attaching rolling reinforcing materials between the projections. CONSTITUTION: A plurality of T-shaped projections 11 having collars 12 at their tips are unitarily provided in parallel to a longitudinal direction on an upper surface of a belt-shaped body 1 of synthetic resins. Engaging recess sections 13 and engaging projection sections 14, which can be mutually engaged to both side edges, are provided. A spiral pipe 6 is formed spirally rolling the belt-shaped body of synthetic resins and engaging the engaging projection sections 14 to the engaging recess sections 13. A reinforcing material 2 is alternately engaged inserting into space between the projections 11 in a manner that both edges of the reinforcing material are engaged to the back of the collars 12 of the projections 11 of the spiral pipe 6.</p> |
