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US3706204A
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Method and apparatus for improving bearing strength of piles in permafrost
Assignee: Individual
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Filing: 1971-02-10
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Granted: 1972-12-19
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Expires: 1991-02-10
Abstract
Abstract A pile has a lower portion insertible into the permafrost or permanently frozen region of the soil, an intermediate portion extending through the seasonal frost or seasonal-thaw region and an upper portion exposed to the atmosphere above the soil. The lower portion is provided with cylindrical or segmented cylindrical rings which extend radially outwardly beyond the surface of the pile. The piles are used in a method of improving the bearing strength of the pile by inserting into a hole down into the permanently frozen region a pile having laterally extending rings or segments of rings on its lower portion below the seasonal-thaw region and then filling the hole surrounding the pile with fill material which eventually freezes and becomes an integral part of the permafrost soil surrounding the hole.
Inventors
- 👤 Erwin L Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:38
CPC Classifications
E; E02; E02D; E02D5/00; E02D5/22; E02D5/24; E02D5/28; E02D27/00; E02D27/32; E02D27/35; E02D5/54
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
A method of increasing the bearing strength of a pile in soil having a permanently frozen region and a seasonal-thaw region comprising adding lateral appendages to a pile, providing a hole of a diameter substantially greater than the diameter of the lateral appendages on the pile and surrounded by a permanently frozen region and a seasonal-thaw region above the permanently frozen region, inserting the pile in the hole to a depth in which the appendages are below the seasonal-thaw region, filling the hole around the pile and the perimeter of the appendages to provide a stable unsheared surface between the pile and appendages and the sidewalls of the hole, and freezing the fill material in the hole to provide an integral bond between the appendages, fill material and permafrost soil surrounding the hole.
Claim 2
Independent Claim
133 words
A method of increasing the bearing strength of a pile in soil having a permanently frozen region and a seasonal-thaw region comprising adding lateral appendages to a pile, providing a hole of a diameter substantially greater than the diameter of the lateral appendages on the pile and surrounded by a permanently frozen region and a seasonal-thaw region above the permanently frozen region, inserting the pile in the hole to a depth in which the appendages are below the seasonal-thaw region, filling the hole around the pile and the perimeter of the appendages to provide a stable unsheared surface between the pile and appendages and the sidewalls of the hole, and freezing the fill material in the hole to provide an integral bond between the appendages, fill material and permafrost soil surrounding the hole.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the material in the hole around the pile has a lower salinity than that of the permafrost soil.
Claim 4
Dependent Claim
27 words
The method of claim 1 wherein the fill material in the hole around the pile has a shear strength greater than the permafrost soil surrounding the hole.
Claim 5
Dependent Claim
54 words
The method of claim 1 wherein the top of the pile is exposed to the atmosphere and the pile is of a type that removes heat from the permafrost and fill material so that the temperature is lowered in the fill material to increase its shear strength at the lateral edges of the appendages.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |