Process and apparatus for laying service lines without excavation

US5096000A · kind A · utility

Assignee

• Paul Schmidt · DE

Inventor

• Alfons Hesse · Lennestadt, DE

Key dates

• Filing date: Jun 6, 1989
• Grant date: Mar 17, 1992
• Expiry date: Jun 6, 2009

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B4/16
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

In a process for laying underground service lines without excavation by means of a ram boring machine, old pipe lines already buried underground are replaced by new service lines without having to tear up the ground or destroy the old pipe line. To enable the new line to be laid accurately in position and to be accurately targeted the ram boring machine is provided with a guiding bore passing axially through the casing and is guided on the old line.