Mine roof support cribbing system
US5462391A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1994 |
| Grant date | Oct 31, 1995 |
| Priority date | — |
| Expiry date | Jan 24, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/006
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A cable bolt mine roof crib for support and stabilization of roof rocks employing a series of cable bolts and/or cable members through a cribbing frame for actively supporting the roof and area surrounding an underground opening. The support imposes a restraint on geologic movement of the roof by the placement of rock anchors on the ends of cables at depth through the rock mass. The anchor portions of the cable bolts are placed beyond the zone of failure that would normally take place around an underground opening. The roof crib provides a bearing area for the roof rock which limits deformation and offers support by suspension to maintain interlock of rock fragments of the roof of the underground opening. The strength and length of cable bolts can be adjusted to fit initial tectonic load conditions and subsequent loads placed upon the opening by adjacent mining. The roof rocks above the crib may be prestressed by tensioning of the individual cable members, by the placement of pump packs or timber lagging between the crib frame and the roof rocks which may be pressurized to preload the entire structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.