Drillable ground support bolt
US5374140A · kind A · utility
Inventors
Key dates
| Filing date | Feb 19, 1993 |
| Grant date | Dec 20, 1994 |
| Priority date | — |
| Expiry date | Feb 19, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/0053
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of installing a drillable bolt into earth, rock or a like material. The drillable bolt comprising a threaded hollow tube (1) with a cutting tip (4) at one end. The drillable bolt being driven into the earth, rock and like material with simultaneous provision of a lubricating fluid being supplied to pass up between the inner surface of hollow tube (1) and the resultant core (30) to the cutting tip (4). Once drilled to the desired position, a liquid cement (25) urged between the core (30) and the inner surface of the hollow tube (1) and past the cutting tip (4) and around to the external surface of the hollow tube (1). The liquid cement (25) securing the drillable bolt in the earth rock, or like material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.