Mine support system
US5547317A · kind A · utility
4Cited by
15References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1993 |
| Grant date | Aug 20, 1996 |
| Priority date | — |
| Expiry date | Dec 22, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D15/483
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The mine support system (26) is typically used in underground coal mines. Support for the hanging wall (40) of the mine is provided by elongate, transversely extending headboards (10) which are supported by spaced apart supports. The supports may take the form of upright mine supports, typically timber props (28) located on the footwall (34) of the mine working, by roof bolts (30) engaging the hanging wall, or by a combination of props and roof bolts. Prestressing grout bags (32) are located on the headboards and bear against the hanging wall. The combination of headboards and bags forms a continuous bridge between the props.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.