Method of salvaging a pipe conduit buried under ground

US4714095A · kind A · utility

Assignee

• Hans Muller · CH

Inventors

• Hans Muller · Küsnacht (ZH), CH
• Hermann Suerbaum · Steinheim, DE

Key dates

• Filing date: Nov 13, 1986
• Grant date: Dec 22, 1987
• Expiry date: Nov 13, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16L55/1656
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method of salvaging a pipe conduit which is buried under ground, especially a sewer pipe, includes soaking a resin-absorbing inner layer of a lining hose, which further includes an impermeable outer layer that outwardly adjoins and surrounds the inner layer, with a first resin. The lining hose is then placed into the pipe conduit. A surface region of a calibrating hose which is to contact the inner layer of the lining hose is provided with a layer containing a second resin. The lining hose is then shaped to conformingly line the pipe conduit. Such shaping involves introducing the calibrating hose into the lining hose in such a manner that the resin-containing layer of the calibrating hose contacts the inner layer of the lining hose and pressing the calibrating hose against the lining hose to urge the latter against the pipe conduit. Finally, at least one of the first and second resins is hardened. Preferably, the other resin contains a substance which chemically reacts with at least the one resin to cause the same to harden during the hardening step upon contact of the resin-containing and inner layers.