| 摘要 |
A profile (5), obtained by cutting, of the end of a corrugated pipe (2) with double wall, in a plastic material of the polyolefin type, to form the weld of an external bell or sleeve (1), cylindrical internally, also in a plastic material of the polyolefin type, injected in situ and positioned axially to the pipe, in order to form a joint (3) of the corrugated pipe itself; this profile (5) being composed of a first ring (6) obtained by a cut perpendicular to the axis of the pipe in the section of internal cylindrical wall (20), intermediate in relation to the axial development of a single corrugation (22) formed by the external wall (21) and by a second ring (7), adjacent to the first, and obtained by a cut combined with the previous one and performed on the wall of the corrugation itself, on its rising section with more radial trend from the centre towards the periphery, with removal of its outermost zone. |
