| 摘要 |
<p>PURPOSE:To eliminate the occurrence of stopping up without being affected by the soil by winding and loading spirally long and narrow tapes of an overlapped film provided with a large number of fine holes in a state to overlap sides of them, and winding and loading reinforcing strips together as a unit on an overlapping section. CONSTITUTION:In a cylindrical resin pipe of which a main drainage pipe body is constituted, after a large number of parallel cuts are made to a pipe wall, two or more films formed by extending in the direction of the cuts are constituted of a textile material 1a formed by overlapping and welding so that the cutting direction and extending direction are at right angles to each other. Those long and narrow tapes are wound and loaded spirally in a state to overlap sides of them, reinforcing strips 2 are wound about the peripheral surface at a certain pitch, and they are welded together as a unit. According to the constitution, it exists in uniform density in the direction of the length and in the circumferential direction, and a positive and better drainage function can be maintained for a long period of time.</p> |
