Method of sealing holes in the ground
US5176219A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Jan 31, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention relates to an apparatus for grouting holes in the ground to prevent a contaminated zone within the ground from contaminating other zones in the ground. In particular, the grouting apparatus is adapted to follow the hole previously formed in the ground and not detour therefrom forming a separate hole which will be grouted in lieu of the previously formed hole. When the grouting apparatus reaches the bottom of the hole, grouting material is expelled from the lower end thereof. The apparatus is thereafter withdrawn as the grouting material fills the vacated hole. The apparatus comprises a plurality of tubular segments connected together to form a pipestring. At the bottom end of the string, there is attached a tip assembly. The tip assembly comprises an outer tubular sleeve and an internal telescoping tubular sleeve. The internal tubular sleeve includes a pointed tip with a shoulder having a larger diameter than the internal tubular sleeve and at least one port along the tubular sleeve for allowing passage of the grouting material out of the string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.