Method and apparatus for forming bulbular base piles
Abstract
Abstract A BOREHOLE FORMING TOOL OR DRIVE PIPE IS PROVIDED WITH AN EJECTION CHAMBER AT ONE END WITH MEANS FOR CONNECTING THE TOOL TO A SONIC DRIVING HEAD. A SONIC DRIVING HEAD IS PROVIDED WITH A DRIVING MANDREL WHICH IS CONSTRUCTED TO TELESCOPICALLY RECEIVE THE TOOL AND ADAPTED TO DRIVINGLY ENGAGE THE DRIVE PIPE IN ONE POSITION AND ENGAGE A PISTON IN THE EJECTION CHAMBER OF THE PIPE IN A SECOND POSITION. THE EJECTION IS FILLED WITH A CHARGE OF SOLIDIFIABLE MATERIAL SUCH AS CEMENT AND THEN DRIVEN SONICALLY TO THE DESIRED DEPTH IN AN EARTH FORMATION, THE MANDREL IS THEN ROTATED TO ENGAGE THE PISTON AND THE CHARGE OF MATERIAL THEN SONICALLY EJECTED FROM THE CHAMBER AND INTO THE FORM OF A RADIALLY-EXTENSIBLE MASS IN THE FORMATION.
Inventors
- 👤 Felix Rayston Stifler Jr
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |