PLASTIC SPIRAL WINDING DOUBLE TUBE FOR PROPULSION METHOD AND MANUFACTURE THEREOF

Japanese Patent JP2634393

B2

PURPOSE: To obtain a plastic spiral winding double tube which can be applied to a sewage pipe, etc., laid by a propulsion method and has a light weight, excellent strength and watertightness by arranging a spirally wound inner tube, a smooth outer tube and spiral protrusions for connecting both the tubes at the intermediate between the inner tube and the outer tube.
CONSTITUTION: A plastic spiral winding double tube comprises an inner wall (inner tube) 1 formed of a spiral winding, a substantially smooth outer wall (outer tube) 2, and a spiral bandlike wall (spiral protrusions to the inner tube) 3 for connecting both the tubes 1, 2 at the intermediate between the tubes 1 and 2. The concrete structure example of the detail can employ, as shown in an enlarged sectional view of the wall, several molds according to manufacturing means. For example, in a corrugated tube having a bandlike material 4 which has, for example a finned U-shaped section and is spirally lap wound with a hollow part 5, a film 7 is spirally lap wound on an assumed cylindrical surface formed by connecting the outer surface 6 of the part 5 to form a double tube having substantially smooth surface.

MATSUDA SATOYOSHI
HISAMURA YOSHIHIKO

JP26035595A

July 23, 1997

October 06, 1995

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DAINIPPON PURASUCHITSUKUSU KK

F16L9/16; B29C53/02; B29C53/36; B29C53/58; B29D23/00; B29L22/00; B29L23/00; (IPC1-7): B29D23/00; B29C53/02; B29C53/36; B29C53/58; F16L9/16

JP62113983A
JP52114114A
JP4323652Y1
JP4723694Y1

Shintaro Nogawa

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