In situ pile forming method

Details In situ pile forming method In situ pile forming method

1977-09-13

1979-06-19

Stein, Mervin

Hydraulic and earth engineering

Foundation

Columnar structure

405233, 405242, E02D 542

Patent

active

041585186

ABSTRACT:
After wet-drilling a hole until a bearing strata is reached, a mandrel with a removable overboot is lowered into the hole and the overboot is seated by a few hammer blows. The mandrel is than partly filled with thick concrete from its top, the top of the mandrel sealed, air-pressurized and a mechanical lifting force is applied. The pressure of the air within the mandrel plus the weight of the concrete forces off the overboot, and also forces the thick concrete against the sides of the hole, and the concrete forms a seal between the sides of the hole and the mandrel. The air pressure also helps lift the mandrel out of the hole.

REFERENCES:
patent: 1904079 (1933-04-01), Powell
patent: 2146645 (1939-02-01), Newman
patent: 2162108 (1939-06-01), Newman
patent: 3434294 (1969-03-01), Hall
patent: 3772894 (1973-11-01), Godley et al.
patent: 3793844 (1974-02-01), Chelminski
patent: 4045966 (1977-09-01), Rusche

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