Method of salvaging a pipe conduit buried under ground

US4770562A · kind A · utility

Assignee

• Hans Muller · CH

Inventors

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

Key dates

• Filing date: Oct 17, 1986
• Grant date: Sep 13, 1988
• Expiry date: Oct 17, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C63/481
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method of salvaging a pipe conduit which has a predetermined inner diameter and is buried under ground, especially a sewer pipe includes the steps of 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 and has an outer diameter which is slightly smaller than the inner diameter of the pipe conduit to be salvaged with an amount of a resin that exceeds that needed for saturating the inner layer. The outer layer is perforated to form a plurality of flow-through openings for the resin therein. The lining hose is subsequently introduced in its collapsed state into the pipe conduit. Finally, the lining hose is shaped to conformingly line the pipe conduit by causing a fluid to flow at a superatmospheric pressure into an auxiliary hose at least partially received in the lining hose and including a turned-over region with attendant gradual advancement of the turned-over region of the auxiliary hose into the lining hose and escape of the excess amount of the resin through the flow-through openings.