Patent · US Expired

Wall element for an underground gallery

US4465404A · kind A · utility

7Cited by

2References

12Claims

0Family size

Assignee

Bochumer Eisenhütte Heintzmann GmbH & Co. KG · DE

Inventors

Peter Heintzmann · Bochum, DE
Manfred Koppers · Sörup, DE
Karlheinz Bohnes · Bochum, DE
Lothar Domanski · Oberhausen, DE

Key dates

Filing date	Jul 9, 1982
Grant date	Aug 14, 1984
Priority date	—
Expiry date	Jul 9, 2002

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21D11/20
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A wall element for an underground gallery has a W-shaped member which is symmetrical relative to its y-axis and has an axis of gravity coinciding with its x-axis and lying at approximately the center of its side, wherein the thickness of its lateral flange portions, base portions and connecting web portions are selected so that, in relation to used weight per meter, the W-shaped member has a maximum possible moment of resistance relative to the x-axis and a maximum possible bending load capacity in the plastic deformation range, and the W-shaped member has such a profile and such thicknesses of these portions that it has at least approximately equal bending load capacities in the plastic deformation region in two opposite directions along the y-axis.

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