Hydraulic and earth engineering – Foundation – Columnar structure
Patent
1991-04-22
1993-06-15
Bagnell, David J.
Hydraulic and earth engineering
Foundation
Columnar structure
475292, 405240, E02D 536, E21B 1032
Patent
active
052192466
ABSTRACT:
A drilling assembly (210) for in-situ cast piles has a drill stem (211) with a helical flyte (212). A drilling head (224), with teeth (225), and a belling tool (226), with retractable cutting tools (227) are mounted on, in driving engagement with, the non-circular shank (218) of a soil stabilization spear (214). The spear (214) drills a pilot hole in advance of the drilling head (224) and grout pumped down through the tubular body (215) of the spear (214) fills the cracks and fissures in the surrounding soil to stabilize the soil as the drilling assembly (210) is advanced. When the desired depth is reached, the rotation of the drilling assembly (210) is reversed and cutting tools (227) are extended to cut a "bell" or annular chamber around the hole. As the drill assembly (210) is withdrawn from the hole, grout pumped down the interior (230) of the stem (211) fills the hole to cast a pile in-situ, the increased diameter of the bottom of the pile, and the stabilized soil around it, increasing its load strength.
REFERENCES:
patent: 1371425 (1921-03-01), Jones
patent: 2990896 (1961-07-01), Kandle
patent: 4100750 (1978-07-01), Labrue
Coutts Peter G.
McQueen Robin
Bagnell David J.
Catawa Pty. Ltd.
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