Patent · US Expired

Method of forming underground ducts, conduits and the like

US4652174A · kind A · utility

7Cited by

9References

8Claims

0Family size

Assignee

Bergwerksverband GmbH · DE

Inventors

Wolfgang Cornely · Gladbeck, DE
Dietrich Stein · Bochum, DE
Bernhard Maidl · Bochum, DE
Karl Kubicki · Bochum, DE

Key dates

Filing date	Feb 4, 1985
Grant date	Mar 24, 1987
Priority date	—
Expiry date	Feb 4, 2005

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B33/138
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

The manufacture of extended, inaccessible holes for underground ducts, conduits and the like is performed by a closed construction process, wherein the preferably remotely-controlled excavation is performed and following that a structure is installed which is employed as the product duct, conduit or the like. The installed structure is provided by injection of an injection material under pressure into an annular space between a form following the excavating apparatus and the ground to manufacture at least one endless inner wall for the hole which then serves as the underground duct, conduit or the like. The novel apparatus of this invention correspondingly comprises a form following the required excavation mechanism conformed to form an annular space between the form and the ground, that form having a form front closing the form and at least one inlet therein for injection of an injection material into the annular space.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.