Yielding column

Details Yielding column Yielding column

2002-04-16

2003-12-02

Swann, J. J. (Department: 3677)

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

C299S011000, C299S012000, C248S542000, C248S548000

Reexamination Certificate

active

06655877

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to a yielding column for use in mines or structures.
Yielding columns are used in mines to provide indications of roof movement possibly leading to roof failure, while supporting the roof. A portion of the column is designed to provide a visible indication of yielding at a load somewhat below the ultimate strength of the column. A good column absorbs a lot of strain before it fails.
FIG. 6
shows the characteristics of various roof-supporting arrangements. Wood cribs are excellent in this regard, as they have a long, flat stress-strain curve.
SUMMARY OF THE INVENTION
An object of the invention is provide a yielding column providing an improved visible indication of load indicative of potential roof failure.
Another object is to provide a support having a broad stress-strain curve.
These and other objects are attained by a yielding column as described below.


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