Extensible reaming self-anchoring anchor rod and supporting method thereof
US10767480B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2017 |
| Grant date | Sep 8, 2020 |
| Priority date | — |
| Expiry date | Jun 7, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/0093
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Provided is a mounting method for an extensible reaming self-anchoring anchor rod, which is especially applicable to roadway construction in coal mines. A big helical structure is arranged on two rod sections of a sectional type anchor rod, a simple drill bit drills and reams a bore and cuts the coal mass in one operation, the outer diameter of the simple drill bit is smaller than the outer diameter of the big helical rod body, and the big helical structure accomplishes secondary reaming, self-drilling and self-anchoring in the drilling process; the big helical structure inhibits propagation and development of sheet cracks of the coal wall in the radial direction, and is embedded in the coal mass through a self-stabilization process of the rock mass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.