Head for injecting a fluid under pressure to break up ground from a borehole
US7000714B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2003 |
| Grant date | Feb 21, 2006 |
| Priority date | — |
| Expiry date | Dec 22, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/18
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention provides a head for injecting a fluid under pressure for breaking up the ground from a borehole and mounted at the end of a string of rods. The body of the drilling head has a bottom wall for mounting a mechanical drilling tool having a feed pipe, at least one injection nozzle, and duct-forming means for connecting the feed pipe with liquid at the inlet of said nozzle, the duct-forming means presenting a mean line having a radius of curvature that varies continuously, the right section of said duct-forming means decreasing regularly over at least half its length from its first end towards its second end. The injection head further comprises at least one pipe for feeding said mechanical tool, said pipe being connected at a first end to said duct-forming means and at a second end to a chamber disposed at the bottom end of said injection head and fitted with a controllable shutter member interposed between said chamber and the pipe for feeding said mechanical tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.