Anchoring method utilizing self-drilling and self-anchoring extendable anchor rod applicable to soft and weak coal rocks
US10487654B2 · kind B2 · utility
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2References
2Claims
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Key dates
| Filing date | Jun 7, 2017 |
| Grant date | Nov 26, 2019 |
| Priority date | — |
| Expiry date | Jun 16, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/0093
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention provides a self-drilling and self-anchoring extendable anchor rod applicable to soft and weak coal rocks and an anchoring method thereof, which are suitable for supporting soft and weak coal rock mass in roadways.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.