Negative friction pile and isolating casing
OwnerPaul G. Cassidyinventor
Life of this patent
Estimating the term…
Abstract
A building pile structure and system utilizing a skin friction pile having a casing or sleeve of somewhat larger inside diameter than the outside diameter of the pile and driven over the pile either simultaneously with the driving of the pile or driven somewhat in advance of the pile to isolate the pile from certain areas of the surrounding soil for a portion of the total depth to which the pile is driven.
Claims6
A skin friction pile for driven support in positive skin friction soil to raise and support or underpin a building structure, said pile comprising a plurality of pile sections in end-to-end abutting relationship, said pile sections being connected together by internal couplings secured in the pile sections, and a casing independent of said skin friction pile surrounding certain said pile sections in negative friction soil, said casing comprising a plurality of casing sections in end-to-end abutting relationship having minimum clearance around the pile sections in the range of approximately 1/64 inch to approximately 5/32 inch, said skin friction pile extending to depths substantially greater than said casing for support solely in positive skin friction soil by positive skin friction only of such soil bearing on the pile, said casing extending to a lesser depth than said skin friction pile through negative friction soil and isolating said certain pile sections from said negative friction soil, said minimum clearance repelling the entrance of soil between the pile sections and the casing sections thereby enabling the pile sections to be driven to greater depths than said casing sections.
A skin friction pile for driven support in positive skin friction soil to raise and support or underpin a building structure, said pile comprising a plurality of pile sections in end-to-end abutting relationship, said pile sections being connected together by internal couplings secured in the pile sections, a casing independent of said skin friction pile surrounding certain said pile sections in negative friction soil, said casing comprising a plurality of casing sections in end-to-end abutting relationship having a predetermined clearance around the pile sections, said skin friction pile extending to depths substantially greater than said casing for support solely in positive skin friction soil by positive skin friction only of such soil bearing on the pile, said casing extending to a lesser depth than said skin friction pile through negative friction soil and isolating said certain pile sections from said negative friction soil, and a seal member secured to the bottom end of the bottom casing section having an outside diameter substantially coincident with the casing and an inside diameter substantially similar to the outside diameter of said skin friction pile, said seal member repelling the entrance of soil between the pile sections and the casing sections at the bottom end of the casing thereby enabling the pile sections to be driven to greater depths than said casing sections.
Dependencies are inferred from the claim text.