In situ pile forming apparatus

Details In situ pile forming apparatus In situ pile forming apparatus

1980-01-30

1981-05-26

Corbin, David H.

Hydraulic and earth engineering

Foundation

Columnar structure

405233, E02D 534

Patent

active

042695449

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 then 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: 1634231 (1927-06-01), Hiley
patent: 2656684 (1953-10-01), Rios et al.
patent: 2822671 (1958-02-01), Dentz et al.
patent: 3303656 (1967-02-01), Landau
patent: 3707848 (1973-01-01), Chelminski
patent: 3772894 (1973-11-01), Godley et al.

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