Hydraulic and earth engineering – Foundation – Columnar structure
Patent
1996-11-26
1999-06-01
Taylor, Dennis L.
Hydraulic and earth engineering
Foundation
Columnar structure
175 57, 405252, 405237, E02D 530, E21B 720
Patent
active
059082682
ABSTRACT:
A method of constructing foundation piles provides improved hole stability and bearing characteristics. A boring a hole is initially formed by drilling. A horizontal pressure is then applied to the inner walls of the hole over a vertical portion of predetermined height until a desired degree of compression is attained. Horizontal pressure is then applied over a subsequent vertical portion of an inner circumferential surface of the hole vertically adjacent to a vertical portion pressed in a preceding step of applying horizontal pressure. The steps of compression are continued until a contiguous vertical expanse of the hole is compressed to a desired degree. Alternatively, the depth of the hole may be increased sequentially following a compression operation, and the subsequently formed hole depth then horizontally compressed. In a further embodiment, vertical pressure is applied over a circumferential annular surface area at a bottom of the hole, and also over a central circular area surrounded by, and adjacent to, the circumferential annular surface area.
REFERENCES:
patent: 1951643 (1934-03-01), Bald
patent: 3164964 (1965-01-01), Josephson
patent: 4488606 (1984-12-01), Inoue
patent: 4547106 (1985-10-01), Lipsker
patent: 4770256 (1988-09-01), Lipsker et al.
Takechi Engineering Co., Ltd.
Taylor Dennis L.
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