Pressure activated injection probe
US6604579B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 3, 2002 |
| Grant date | Aug 12, 2003 |
| Priority date | — |
| Expiry date | Jan 3, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D3/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An injection probe assembly is disclosed for injecting material into subsurface formations for making geotechnical improvements. The probe assembly includes a sheath having an upper end for attaching to a mating tool string and a lower end for receiving a solid drive point. The sheath has a reduced diameter injection area which includes an interior space enclosed by a tubular sidewall, a valve seat, and a plurality of injection ports extending through the sidewall through which materials can be injected laterally. A check valve spool is arranged for sliding movement within the interior space for preventing back-flow of material into the interior space. The spool is seated on the valve seat and covers the injection ports in a first position, and is unseated from the valve seat with the injection ports uncovered in a second position. The spool is responsive to pressure changes of the injected materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.