Method of and apparatus for crushing earth under the ground
US4688648A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1985 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | May 24, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/292
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Method and apparatus for crushing the earth under the ground by boring a hole; inserting a drill head having radially directed water jet thereon down the hole to the desired stratum; rotatingly moving the drill head upwardly while jetting water radially to form a cylindrical crushed area; lowering the drill head to the original depth; extending a water jet extender arm radially to a projecting position; again rotatingly moving the drill head upwardly while jetting water from the nozzles on the radial outward portions of the extender arm to radially enlarge the cylindrical crushed area, the rotation of the extender arm also stirring the already crushed area; returning the extender arm to an original waiting position; and lifting the drill head out of the hole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.