Patent · US Expired

Tunnel drive shield

US4122683A · kind A · utility

19Cited by

4References

7Claims

0Family size

Assignee

Gewerkschaft Eisenhutte Westfalia GmbH · DE

Inventors

Hans G. Follert · Dortmund, DE
Klaus Linde · Grafenau, DE
Hans Jutte

Key dates

Filing date	Apr 8, 1977
Grant date	Oct 31, 1978
Priority date	—
Expiry date	Apr 8, 1997

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21D9/0879
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A tunnel drive shield is provided with a plurality of bracing units spaced around its periphery. The bracing units are expansible against the surrounding tunnel wall to control the direction of shield advance. A bracing unit is provided in each of the four shield quadrants defined by the vertical and horizontal center planes of the shield. Each of the bracing units is expansible in a non-radial direction.

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