Under-reaming pile bore excavator

Details Under-reaming pile bore excavator Under-reaming pile bore excavator

1981-04-27

1983-08-02

Pate, III, William F.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Plural cutter elements longitudinally relative movable into...

175285, 175325, 405237, E21B 1032, E21B 1030

Patent

active

043960766

ABSTRACT:
An under-reaming pile bore excavator by which a straight pile bore is first excavated vertically to a given depth by rotating the main drill bits and the under-reamed bore is next excavated downward and outward into a given shape by rotating the slidable wing bits. The under-reaming pile bore excavator of the present invention comprises a plurality of guide rails, and a plurality of slidable wing bits mounted on the guide rails which excavate the under-reamed bore, in addition to the conventional main drill bits which excavate the straight pile bore. In using the under-reaming pile bore excavator of the present invention, it is possible to obtain a stable impermeable soil surface on the excavated bore to prevent water from penetrating into the soil wall and to prevent lumps of soil from being dislodged therefrom.

REFERENCES:
patent: 3112802 (1960-06-01), Amann et al.
patent: 3938598 (1976-02-01), Watts
patent: 4046205 (1977-09-01), Asayama
patent: 4193462 (1980-03-01), Blaschke et al.

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