Fractured roof 110 mining method entry-side anti-collapsed structure
US10677055B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 2016 |
| Grant date | Jun 9, 2020 |
| Priority date | — |
| Expiry date | Aug 1, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A fractured roof 110 mining method entry-side anti-collapsed structure, one working face of the 110 mining method corresponds to one roadway but without retaining any coal pillar, the roadway retains an entry after the previous working face implements mining top-cutting pressure release, and a roof of the roadway is arch-shape, directional cutting is conducted on one side of the roadway, and the cutting angle is between 15-20 degrees. One working face corresponds to one roadway but without retaining any coal pillar when underground mining is conducted, which can save resources and improve recovery rate of mining. And, the roof of the roadway of the retained entry is arch-shaped, which can improve safety and ensure safety of the coal mining working face. In addition, a cutting angle is 15-20 degrees, which can effectively determine a roof caving direction after top-cutting and reduce affect to the retained entry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.